瑞士专利CH715250A2 Preform for the production of a plastic container and plastic container produced from the preform.

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专利摘要:
The invention relates to a preform (11) for producing plastic containers, in particular plastic bottles, in a two-stage stretch blow molding process, comprising an elongated body (13), a bottom (15) which is formed at a first longitudinal end of the body (13), one Neck portion (17), which is formed at a second longitudinal end of the body (13) and is opposite the first longitudinal end, a pouring opening (19), which is provided on the neck portion (17) and a support ring (21), which is radial from the body (13) protrudes and separates the neck portion (17) from the body (13). The support ring (21) is a separate support element which can be positively attached to the preform (11).
公开号:CH715250A2
申请号:CH00630/19
申请日:2019-05-14
公开日:2020-02-14
发明作者:Demir Adem
申请人:Alpla Werke Alwin Lehner Gmbh & Co Kg；
IPC主号:

专利说明:

Description Field of the Invention The invention relates in particular to an injection molded preform according to the preamble of claims 1 and 23, a support ring according to the preamble of claim 25, a plastic container according to the preamble of claim 27 and a method for producing plastic containers, in particular plastic bottles, according to Preamble of claim 29.
PRIOR ART [0002] The stretch blow molding process is known for the production of plastic bottles. In this process, a so-called preform is first injection molded with an elongated preform body. The preform has a bottom at a first longitudinal end and has a neck section at its second longitudinal end opposite the first longitudinal end. The bottle cap and usually a support ring is formed on the neck section and is injection molded together with the preform. The preform is introduced into a molding tool and first stretched in length in the molding tool by a stretching mandrel and then inflated with compressed air, as a result of which it is stretched radially. As a result, the preform assumes the bottle shape specified by the molding tool. After the stretching / blowing process, the finished plastic bottle is removed from the mold.
In the so-called one-stage stretch blow molding process, the preform is formed into a plastic bottle without cooling and intermediate storage immediately after it has been injection molded.
In the two-stage stretch blow molding process, the preform is usually injection molded, cooled and temporarily stored in a first process step. Alternatively, preforms can also be produced in extrusion blow molding processes or as plastic molding processes. Here too, the preforms are cooled and stored after they have been produced.
The preform is reheated in a second later process step and stretch-blown in a mold as described above. For example, regions of the preform are heated more or less with infrared radiation in order to introduce a temperature profile into the preform, which is required for the stretch blow molding of the preform.
In order to be able to transport the preform between the individual production stations, the support ring is formed on the preform below the bottle stopper and extends in the circumferential direction. The support ring acts as a holding element on which transport devices and holding devices of the production line can act. So that the transport or holding devices can engage the support ring, the cross-sectional diameter of the preform in the radial direction is basically smaller than the diameter of the support ring.
As a result, the cross-sectional diameter of the preform is limited and the dimensions and the associated design options for the preform and the bottle produced therefrom are limited. For example, a quantity of material required for the plastic bottle to be produced can be introduced into the preform by increasing the rope length.
The support ring, which generally no longer functions on the plastic bottle produced, means an increased use of material, because the support ring usually accounts for 20% of the weight of the preform neck. The weight of the preform neck in turn comprises 10% of the material required for the production of a plastic bottle. In the manufacture of mass-produced articles, for example plastic bottles made of polyethylene terephthalate (PET), the use of materials is an essential factor for ecological and economic competitiveness. Due to the very high number of plastic bottles produced, even small reductions in the weight of the material per bottle have the potential to save material in the tonne range respectively.
OBJECT OF THE INVENTION The disadvantages of the prior art therefore provide the object of the present invention to propose a preform which allows improved design options for the bottle to be produced. Another goal is to show a preform that enables material to be reduced and the weight to be reduced. Another goal is to provide information regarding the preform material, the contents of the container, the origin of the preform, etc., as simply and reliably as possible.
Description A preform for producing plastic containers, in particular plastic bottles, usually comprises an elongated body, a base which is formed at a first longitudinal end of the body, a neck section which is formed at a second longitudinal end of the body and opposite the first longitudinal end lies, a pouring opening which is provided on the neck portion and a support ring which projects radially from the body and separates the neck portion from the body.
The problem is solved in an injection molded preform in that the support ring is a separate support element which can be positively fixed to the preform. According to the prior art, in a two-stage stretch blow molding process, the support ring is injection molded together with the preform, as a result of which the preform
CH 715 250 A2 and the support ring are in one piece. Because the support ring is a separate support element, the outer diameter of the body is no longer limited by the outer diameter of the support ring. The outside diameter of the support ring must be larger than the outside diameter of the body in order to be able to transport the preform between the production steps. The size of the outer diameter of the support ring can, however, be chosen to be of any size, since it can be removed from the preform or the plastic container produced. This opens up unimagined possibilities for the design of plastic containers, which are produced in the two-stage stretch blow molding process. In particular, the invention makes it possible to produce plastic containers with much larger outside diameters. The invention is preferably characterized in that the support ring is removable from the preform. This means that a large outer diameter of the support ring does not interfere with the design and function of the plastic container produced, because it can be removed from the plastic container or the preform. The removable support ring is reusable and can be attached to and removed from a large number of preforms. This also allows a significant amount of material to be saved, since the support ring is not injection molded together with the preform and a single support ring is not required for each preform.
In a preferred embodiment of the invention, the support ring has a data carrier which is at least a carrier of an identification number. Because the support ring can be removed from the preform, material for preform production can be saved and the identification number can be used again with another preform or a new identification number is stored on the data carrier. The identification number makes it possible for further data relating to the preform not to have to be stored on the data carrier, but rather to be stored in an external database. With the identification number, all external data can be clearly assigned to the preform or the container made from it. Since the data carrier only has the identification number, it can be designed very simply. It is conceivable that the surface of the preform or of the plastic container produced from the preform has the data carrier.
It is preferred if the data carrier carries information such as the time and place of production, preform material and information on reusability, information on the contents of the product or information on a deposit system relating to the plastic container. The data carrier can therefore provide a complete description of the container and its contents, and the data carrier can flexibly store exactly the information which is required by the producer, the customer and the recycler.
In a preferred embodiment of the invention, the data carrier is implemented in the form of an electronic circuit. The removable support ring, which has the electronic circuit, makes it possible that the container does not have to be regarded as electronic waste when it is disposed of, but can be disposed of or recycled in the usual way. The data carrier can be replayed and reused on another preform or disposed of separately.
Characterized in that the electronic circuit is positioned inside or on the support ring, it can be particularly well protected or fastened, or can be applied to the support ring in a simple manner.
[0017] In a particularly preferred embodiment of the invention, the electronic circuit is an RFID transponder. In the context of this application, an RFID transponder (radio-frequency identification transponder) is to be understood as an electronic circuit from which data can at least be read out of the transponder with the aid of electromagnetic waves without contact. A reader is required for reading. In the case of a passive RFID transponder, its energy supply is provided from the radio signals from the reader. The structure of an RFID transponder basically provides an antenna, an analog circuit for receiving and transmitting (transceiver) as well as a digital circuit and a permanent memory. The digital circuit is a small microcontroller in more complex models. RFID transponders have at least one writable memory that contains their unchangeable identity. If multi-writable memories are used, further information can be stored during the service life. An RFID transponder can be made very small and can therefore be easily accommodated in the support ring. The RFID transponder is preferably a passive RFID transponder, although an active RFID transponder with its own power supply is also conceivable. Since the data are read in and out of the RFID transponder via the transmitter, the data carrier need not be visible and can be cast in the support ring. As a result, it is particularly well protected against mechanical loads and contamination. By removing the support ring from the preform or the plastic container, the RFID transponder can be reused on another preform or disposed of separately.
In a further preferred embodiment of the invention, the data carrier is attached in legible form for a data acquisition device, for example as a bar code or QR code, on the surface of the support ring. This form of the data carrier is inexpensive to manufacture, but the data carrier must lie on the surface of the support ring in order to be visible and therefore legible. Other data carriers in readable form, for example a three-dimensional watermark, are also possible.
The preform according to the invention is mainly used for the production of plastic containers in a two-stage stretch blow molding process, because the support ring is required in the further processing of the preform - as explained above - so that transport devices and holding devices of the production lines can attack. However, there are also
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Applications are conceivable in which a support ring in a different form is used as transport devices and holding devices, for example in the system for filling the finished plastic container.
In a particularly preferred embodiment of the invention, a groove extending in the circumferential direction of the preform is preferably provided on the preform at the transition from the neck portion to the body, in which the support ring can engage. The support ring is reliably held on the preform by this embodiment and can nevertheless be removed or removed from it without any effort. Other conceivable embodiments of the positive connection can be projections on the preform, into which the support ring engages or that the support ring can be screwed onto the neck section.
It has proven to be expedient if the groove comprises a base and a first and second plank adjoining the base. The cross-section of the groove is preferably U-shaped, as a result of which the support ring cannot slide up or down on the preform and is reliably held on the preform even under mechanical loads during the production steps.
In a further embodiment of the invention, the inner diameter of the support ring essentially corresponds to the diameter of the base. The support ring is therefore held on the preform without play, which means that even mechanical loads which occur during production are unable to separate the support ring from the preform.
In a further embodiment of the invention, the support ring is open and can be expanded in such a way that it can be plugged onto the preform by being accommodated in the groove. The support ring is therefore simple in design and can be mechanically attached to and removed from the preform.
Appropriately, the support ring has an opening angle of less than 180 degrees and greater than 0 degrees, preferably less than 160 degrees and greater than 30 degrees and particularly preferably less than 120 degrees and greater than 70 degrees. This dimensioning makes it possible for the support ring to be expandable by simply bending its ends and to be plugged onto the preform and can be removed therefrom.
In a further embodiment of the invention, the support ring has at least one joint, around which it can be opened and closed. In this embodiment, the support ring can be made of a stable inelastic material, since no elastic material deformation is required in order to fix the support ring on the preform and to remove it from it. It is also conceivable for the support ring to comprise two joints along its circumference, one of the joints being detachable and the support ring being able to be opened around the other joint. This type of attachment is particularly stable.
In a further embodiment of the invention, which also leads to a very stable holder, the support ring comprises two semicircular segments which can be attached to one another.
In a further embodiment of the invention, the support ring consists of a plastic-coated spring steel, metal or plastic. The plastic jacket prevents the preform from being scratched when attaching or removing the support ring. The material of the support ring is to be selected depending on how far the support ring must be able to be bent open without the material being damaged.
In a further embodiment of the invention, the support ring consists of an elastic material and has a plurality of lamellae extending in the radial direction and bendable in the axial direction of the preform. The support ring can be pushed onto the preform in the axial direction until it engages in the groove and can also be pulled off the preform or the plastic container in the axial direction. In this embodiment, the support ring is designed in the manner of the machine element of a lamella ring.
Appropriately, fastening means are formed on the neck portion for the form-fitting fixing of a closure part equipped with corresponding engagement means. This allows the pouring opening of the plastic container to which the preform is blow-molded to be closed with the closure part.
In a particularly preferred embodiment of the invention, the body has an outer diameter which projects beyond the outer diameter of the neck section by more than 5 mm, preferably by more than 10 mm and particularly preferably by more than 15 mm. The fact that, according to the invention, the outside diameter of the support ring no longer represents the limiting size for the outside diameter of the body, this can be increased. This results in high radial stretching rates, since there is sufficient material which leads to a very large outer diameter being possible in relation to the outer diameter of the neck section in the plastic container produced. Such outside diameters are impossible to achieve in the prior art, since the outside diameter of the preform body in these preforms is limited by the outside diameter of the support ring injected together with the preform. It would also be conceivable that the wall thickness of the preform body increases by reducing the inside diameter of the body. That is, the outside diameter of the body remains small and the inside diameter of the body is reduced. However, this is not preferred, since on the one hand this leads to increased radial stretching rates and on the other hand the inside diameter of the body is limited by the outside diameter of the stretching mandrel.
The invention is also preferably characterized in that the ratio of the outer diameter of the body to the outer diameter of the neck portion is between 1.05 and 0.7. Such a small ratio of
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0.7 is possible because the support ring, the outside diameter of which must be larger than the outside diameter of the body, is removable and is no longer present on the plastic container after its production. As already described several times, the invention enables the plastic container to have a very large body outer diameter given a predetermined standard outer diameter of the neck section.
In a further preferred embodiment of the invention, the body has a wall thickness of 3 mm, preferably 5 mm and particularly preferably 7 mm, the inside diameter of the neck portion and the body being essentially the same size. The increasing wall thickness allows plastic containers with large ones. To produce outside diameters without a support ring with an unacceptably large outside diameter being present on the plastic container.
Advantageously, the preform consists of polyethylene terephthalate or polypropylene. These materials are known to be processed particularly well in the two-stage stretch blow molding process. However, other materials such as polyethylene furanoate can also be used to produce preforms.
A further aspect of the invention relates to a hasty preform, which preform is free of a support ring and which preform has a fastening means between the body and the neck section for the form-fitting fixing of a support ring equipped with a corresponding engagement means. Since the preform and the support ring are two separate parts, they do not necessarily have to be delivered together. For economic reasons, it is desirable that support rings already used for the production of plastic containers are reused and connected with new injection molded preforms. This enables a significant amount of production material to be saved. The use of material for the preform is therefore reduced since it has no support ring. The material volume of the preform is reduced by the volume of the support ring.
In a further preferred embodiment of the invention, the fastening means is a groove extending in the circumferential direction of the preform. The groove enables a particularly reliable mounting of the support ring on the preform. However, other fastening means would also be conceivable, such as an external thread onto which the support ring is screwed or projections onto which the support ring is attached.
Another aspect of the invention relates to a support ring for attachment to a preform. The support ring advantageously has a data carrier which is at least a carrier of an identification number. The advantages of the data carrier have already been described above.
In a particularly preferred embodiment, the data carrier is an electronic circuit which is positioned inside or on the support ring or the data carrier is attached in a legible form for a data acquisition device, for example as a bar code or QR code, on the surface of the support ring.
Another aspect of the invention relates to a plastic container manufactured in a two-stage stretch blow molding process from a preferably injection-molded preform described above, wherein a fastening means for the form-fitting fixing of a support ring equipped with a corresponding engagement means is formed between the body section and the container neck. As already described in detail, it is the essence of the invention that the support ring of the. Preform or from the plastic container is removable. As a result, the outer diameter of the support ring and the shape of the support ring do not affect the design of the plastic container, since the support ring is no longer present on the finished plastic container. The outer diameter of the support ring can therefore be of any size, as long as the production processes are not hindered thereby.
In a further particularly preferred embodiment of the invention, the ratio of the container neck diameter to the outside diameter of the body section is 3 to 6, in particular 3.8 to 5.5. With a standard container neck diameter of <25 mm, as is common with PET bottles, outside diameters of around 150 mm can be achieved. This applies in particular to PET bottles with oval cross-sections. With injection molded preforms according to the prior art, it is not possible to produce plastic containers with such dimensions.
Another aspect of the invention relates to a method for producing plastic containers, in particular plastic bottles, in a two-stage stretch blow molding process and a method for providing data relating to the plastic containers produced. According to the present invention, a support ring is positively attached to the preform after injection molding between the body and the neck section. The support ring is therefore not injection molded in one piece with the preform, but is fixed on it as a separate support element after the preform has been produced. According to the present invention, the support ring can also be produced together with the preform in a common injection mold using a two-component injection molding process. The support ring can be made of a different material than the preform so that it can be removed from the preform. If the plastics used do not form a bond with one another, it is possible in this way to easily fit the preform with a removable support ring in a single production step.
In a further particularly preferred embodiment of the invention, a data carrier in the form of an electronic circuit is inserted into the injection mold during the manufacture of the support ring and is encapsulated by the support ring. The electronic circuit is particularly well protected and kept. The prerequisite for this is that the data can be read from the data carrier without an optical process, since the data carrier is not visible.
CH 715 250 A2 In a further embodiment of the invention, the support ring is attached to the preform in the injection molding machine, preferably during the cooling process, or after removal of the preform from the injection molding machine if the support ring is manufactured separately from the preform. The aim is not to extend the procedure by the additional step of fastening the support ring. Therefore, the support ring is attached to the preform in synchronization with an existing process step.
In a further embodiment of the invention, the support ring is removed from the plastic container when the mold is closed or after the plastic container has been removed from the mold. Even when the support ring is removed, the aim of this additional process step is not to lose any additional time during the production of the plastic container. Since the number of items and the number of cycles in the manufacturing process are very high, even a little additional time can lead to a significant deterioration in productivity. Therefore, the support ring is preferably removed from the molding tool on a conveyor belt during stretch blow molding or the transport step of the plastic container or from the plastic container during the packaging step of the plastic container.
Advantageously, data is read into the data memory during the production process of the plastic container and / or during the filling process of the plastic container. As a result, data is available on the data storage that is relevant to the production process. The traceability of the production process can therefore be fully documented on the data storage.
Advantageously, data are read from the data memory during the production process of the plastic container and / or during the filling process of the plastic container. It is conceivable that the read out. Data of the production process and / or the filling process can be partially or completely controlled.
In a further preferred embodiment of the invention, data is read out from the data memory during use of the plastic container and / or during recycling of the plastic container. This enables the consumer to be informed with data that can be displayed on a smartphone, for example. Likewise, data relevant for the recycling of the container can be read out from the data memory. This reliably prevents incorrect classifications or assignments of the container during recycling.
It proves to be advantageous if the support ring is removed from the plastic container after the production of the plastic container or after the filling of the plastic container. In particular, if the data on the data memory are no longer required after production or after the container has been filled and the support ring does not have to perform a holding function, the support ring can be removed and used again. This leaves a pure plastic container that can be easily disposed of or recycled. The support ring can often be attached to other preforms and again fulfills the holding function and new data can be read in and read out or the existing data can continue to be used. The material required for the support ring can be saved for each container from which the support ring is removed.
It has proven to be useful if the support ring is removed from the plastic container before disposal or during recycling of the plastic container. Relevant data can thus also be made available to the user and the recycler of the container. The removed support ring can be fed to a collection system. As a result, the support ring can be placed on a further preform and the container separated from the support ring can be disposed of or recycled according to type.
Further advantages and features emerge from the following description of several exemplary embodiments of the invention with reference to the schematic representations. In a representation that is not to scale:
1: a first embodiment of a preform and a support ring in an axonometric view;
FIG. 2: a front view of the preform from FIG. 1;
3 shows a sectional illustration of the preform from FIG. 2 along the section line III-HI;
4: a second embodiment of the preform in a front view;
5 shows a sectional view of the preform from FIG. 3 along the section line V-V;
6: a third embodiment of the preform in a front view 7: a sectional illustration of the preform from FIG. 6 along the section line Vll-Vll;
8: a second embodiment of the support ring;
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9: a third embodiment of the support ring;
Fig. 10: a fourth embodiment of the support ring
11: a fifth embodiment of the support ring with a first embodiment of a data carrier and
Fig. 12: the fifth embodiment of the support ring with a second embodiment of a data carrier.
1 to 7, a preform is shown, which is generally designated by the reference numeral 11. The preform 11 is used to manufacture plastic containers and in particular to manufacture plastic bottles in a two-stage stretch blow molding process. In the first stage, the preform is injection molded and then cooled. In the second stage, the preform is heated according to a predetermined temperature profile and biaxially stretched in a molding tool. The preform was stretched along the longitudinal axis with a stretching mandrel and is stretched in the radial direction by inflation.
The preform 11 comprises an elongated body 13 with a first and a second longitudinal end. At the first longitudinal end, a bottom 15 is formed, which also forms the bottom of the plastic container made from the preform 11. A neck section 17 is formed at the second longitudinal end. At the neck portion 17, a pouring opening 19 is provided through which the stretch-blown plastic can be filled and emptied.
In contrast to the prior art, a support ring 21 is not injection molded together with the preform 11, so that the preform 11 and the support ring are in one piece. Rather, the support ring 21 is a separate support element which is produced separately from the preform 11. The presence of the support ring 21 is inevitable in the two-stage stretch blow molding process, since the preform 11 or the plastic made therefrom is held on the support ring 21 in the mold and also means of transport attack on the support ring 21 to the preform or the plastic container between to be able to transport the individual manufacturing stations or to be able to feed them to the manufacturing stations.
The support ring 21 is held in a form-fitting manner on the preform 11 and can be plugged onto and removed from the preform 11. The outer diameter of the support ring 21 is the limiting factor for the outer diameter of the preform body 13. In order to be able to transport the preform, the support ring must form a protrusion from the preform body. Therefore, the outside diameter of the preform body must always be smaller than the outside diameter of the support ring. Since, according to the prior art, the support ring cannot be removed from the preform, it also remains on the plastic container produced. On this, however, the support ring must not exceed a certain outer diameter, since this is not acceptable to the consumer. In addition, the material costs and weight increase associated with an enlarged support ring are not acceptable.
Surprisingly, a removable support ring 21 leads to unforeseen improved design options for the plastic container to be produced. After the support ring 21 can be removed from the preform 11, it can have a much larger outside diameter than if the preform and the support ring are in one piece. Accordingly, the preform body 13 can also have a larger outer diameter than preform bodies of the prior art. This means that the preform body 13 can be injection molded with an increased wall thickness towards the outside.
As a result, plastic containers with a significantly larger outside diameter can be stretch-blown. The diameter of the neck section 17 is independent of the outside diameter of the plastic container and can therefore be chosen to be as small as required, as required by the specifications for the end product.
The setting and removal of the support ring 21 from the preform. 11 can be realized in that the support ring 21 is held in a form-fitting manner on the preform 11. The positive connection can take place, for example, by the support ring 21 engaging in a groove 23 provided on the preform 11. The groove 23 is preferably formed between the neck section 17 and the body 13 and extends in the circumferential direction of the preform 11. It is preferably an annular groove, but a groove can also be formed which does not completely cover the circumference of the preform 11 only partially, encloses.
By definition, the groove comprises a base 25 and a first and second side flank 27a, 27b, which adjoin the base 25. In order to achieve a secure and wobble-free form fit between the groove 23 and the support ring 21, the inner diameter 29 of the support ring 21 is dimensioned such that it essentially corresponds to the diameter 31 of the base 25.
The support ring can have different configurations according to FIGS. 1 and 8 to 11, so that it can be fixed on the preform 11 and can be removed therefrom. An open support ring 21 is shown in FIG. 1, the opening angle 32 of which is approximately 100 degrees. Depending on the elasticity of the material from which the support ring 21 is made, the opening angle can also strive towards 0. Then, however, the support ring 21 must be bent out of its plane of extension so that it can be attached to the preform. However, the opening angle must be less than 180 degrees so that it does not slip off the preform 11. The support ring 21 is preferably made of a plastic or a metal. The choice of material is also influenced by whether the support ring 21 is used multiple times or is discarded after being plugged on and removed from the preform 11.
CH 715 250 A2 A further embodiment of the support ring is shown in FIG. 8, which is numbered 33. The support ring 33 is made in two parts. The two open and preferably semicircular parts 34a, 34b of the support ring are provided with a first and second joint 35a, 35b. The joints 35a, 35b have bolts 37a, 37b. The bolts 37a, 37b hold the parts of the support ring 37 together and the parts can also be pivoted about one of the bolts 37a, 37b when the other bolt is removed from its holder, in that the two parts of the support ring preferably have the shape of semicircular segments have, which are rotatably held together with the removable bolts 37a, 37b, the support ring can be fastened and removed from the preform 11 quickly and without tools.
9 shows a further embodiment of the support ring, which is designated by the reference number 39. This support ring 39 also comprises two preferably semicircular parts 41a, 41b. In this embodiment, the two parts 41 a, 41 b are held together by magnets 43. The magnetic force is dimensioned such that the support ring parts 41 a, 41 b are not removed from the preform during the container production due to external loads, but can be separated from one another with manual force or a comparable force from a removal machine.
The support ring can also be designed in an embodiment according to FIG. 10. This lamellar ring or support ring 45 has a plurality of lamellae 47 which extend in the radial direction and which are separated from one another by depressions 49. The support ring 45 can be slid onto the preform from above by the fins 47 being bent open in the axial direction and locked in the groove 23 by their restoring force. The support ring 45 can be pulled off the preform 11 in the reverse axial direction just as easily.
In the fifth embodiment, the support ring is shaped as a kind of Seeger ring 51. The Seeger ring 51 can be positioned in the groove 23 and removed therefrom with the aid of a spreading pliers which can engage in the attack holes 54.
Support rings in other embodiments, which can be received in the groove, are also conceivable.
2 to 7 differently shaped preforms 11 are shown, on which a support ring 21, 33, 39, 45, 51 can be attached and removed again as described above. Fastening means can be formed on the neck section 17 in order to form-fit on the closure part. To attach neck portion 17. This can be an external thread 52, as shown in FIGS. 1, 2, 3, 6 and 7, which corresponds to the internal thread of a closure cover. In FIGS. 4 and 5, an annular shoulder 53 is shown with an edge, which with a corresponding lid forms a snap lock.
By means of the present invention, plastic containers can be produced by the two-stage stretch blow molding process, the outer diameter of which is much larger than the prior art has permitted until now. Since the support ring can be removed after production of the plastic container, this does not represent a limiting size for the outer diameter of the preform 11. Therefore, plastic material can be provided on the outer wall of the preform 11, which increases its outer diameter. The applied plastic material in a radial extension enables the formation of large container diameters without the plastic material being pushed over. The outside diameter of the support ring, which must be larger than the preform outside diameter for production-related reasons, has no influence, since the support ring can be removed from the finished plastic container. 6 and 7, for example, a preform 11 is shown, which has a preform body 13 with a particularly large outside diameter, since the wall thickness is deliberately increased with plastic material. The wall thickness can be up to 6 mm. For technical reasons, the outer diameter of the support ring must be larger than the outer diameter of the body 13 - since the support ring is removable, it is no longer present on the plastic container produced and therefore has no influence on the design of the end product. The increased wall thickness of the body 13 enables increased radial stretching rates, as a result of which a plastic container with a large outside diameter of the body section can be produced relative to the outside diameter of the neck section. It is preferred if the wall thickness increases outwards and the inner diameter of the preform 11 is constant in the axial direction. As a result, the outside of the body is closer to the cavity walls of the mold. As a result, overstretching of the preform in the radial direction can be prevented.
The process according to the invention for the production of plastic containers takes place in a two-stage stretch blow molding process according to the following steps:
In the first step of the two-stage stretch blow molding process, a preform 11 with an elongated body 13, a bottom 15, which is formed at a first longitudinal end of the body 13, a neck portion 17, which is formed at a second longitudinal end of the body 13 and the first longitudinal end opposite and a pouring opening 19, which is provided on the neck portion 17, injection molded.
In the second step of the two-stage stretch blow molding process, the preform 11 is reheated, introduced into a mold and first stretched in the mold by a stretching mandrel and then inflated with compressed air, and the finished plastic bottle is removed from the mold.
A support ring 21,33, 39, 45, 51 which is essential for the production of the plastic container in the two-stage stretch blow molding process is not injection molded together with the preform 11. Rather, the support ring 21, 33, 39, 45, 51 is attached to the preform 11 after the injection molding between the body 13 and the neck portion 17.
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The support ring 21, 33, 39, 45, 51 is therefore a separate element which is only connected to the preform 11 after the injection molding.
In order to keep the process times as short as possible, it is preferred if the support ring 21, 33, 39, 45, 51 is connected to the injection molded preform 11 during the cooling process, preferably in that the support ring
21,33, 39, 45, 51 is placed on the preform 11. The support ring can also be connected to the preform during a process step following injection molding. It is important that the support ring is attached to the preform before the preform is inserted into the mold.
It is also possible to produce the support ring 21, 33, 39, 45, 51 and the preform 11 together in a common injection mold using a two-component injection molding process. The support ring can be made of a different material than the preform so that it can be removed from the preform. If the plastics used do not form a bond with one another, this allows the preform to be easily fitted with a removable support ring.
In order not to extend the process times at all or only slightly, the support ring 21, 33, 39, 45, 51 is removed from the finished blown plastic container during a process step after the plastic container has been molded.
The support ring 21, 33, 39, 45, 51 can be removed with the mold still closed. However, if the support ring is still required for further transport purposes, it is only sensible to remove it after it has been removed from the mold. For example, the support ring can take place during the transport for the final packaging or filling of the plastic container. The support ring can also be removed from the container during the final packaging of the plastic container, for example palletizing.
The support ring 21, 33, 39, 45, 51 can have a data carrier. The disk can be in or on the support ring
21,33, 39, 45, 51 may be appropriate. It is preferred if the data carrier is implemented by an electronic circuit 55. The electronic circuit can be an RFID transponder 55, in particular a passive RIFD transponder. In the context of this application, an RFID transponder (radio-frequency identification transponder) is to be understood as an electronic circuit from which data can be at least read and preferably also read in using the electromagnetic waves from the transponder. A reader is required for reading. In the case of a passive RFID transponder, its energy supply is provided from the radio signals from the reader. The structure of an RFID transponder basically provides for an antenna, an analog circuit for receiving and transmitting (transceiver) as well as a digital circuit and permanent memory. The digital circuit is a small microcontroller in more complex models. RFID transponders have at least one writable memory that contains their unchangeable identity. If multiple rewritable memories are used, further information can be stored during the service life. An RFID transponder can be made very small and can therefore be easily accommodated in the support ring 21, 33, 39, 45, 51. An RFID transponder 55 is arranged on the support ring 45 as a representative of all the support rings shown in FIG. 11.
The following information can be stored, for example, in the RFID transponder 55:
- a unique identification number
- the time and place of production
- The material of the preform 11 and information about its recyclability
- Product information on the content of the container which is made from the preform 11,
- information whether it is a deposit container,
- Information as to whether a deposit has been paid by the end consumer for the bottle (e.g. by storing the relevant information during the checkout process at checkouts) and
- Information regarding the deposit system, i.e. Information can be saved that provides information about which deposit system is used.
It is conceivable that only the identification number is stored in the RFID transponder 55 and that this can be clearly assigned to other information which is stored externally. In this embodiment, the identification number can be used in conjunction with a database to store the remaining information centrally and to make it accessible via the identification number. The remaining information can then be stored in the permanent memory, as a result of which the storage capacity can be kept low.
During the production of the support ring 21, 33, 39, 45, 51, the data carrier in the form of an electronic circuit can be inserted into the injection mold and overmolded by the support ring. Then the data carrier, for example the RFID transponder 55, is located within the support ring and is reliably protected against mechanical damage or contamination. The RFI D transponder 55 does not have to be visibly attached to the support ring, since the data is transmitted via radio. This is why an RFID transponder is also referred to as a “radio tag”.
In particular, in the event that the data carrier is implemented in the form of an electronic circuit, it is important that the support ring 21, 33, 39, 45, 51 can be removed. If the electronic circuit were installed in the wall or floor surface of a container, the entire container would be difficult to recycle and waste after use
CH 715 250 A2 to be treated as electronic waste. Disposing of it would be significantly more complex than the disposal of pure plastic containers.
The data carrier can also be attached in legible form for a data acquisition device, for example as a bar code or QR code, on the surface of the support ring 21, 33, 39, 45, 51. It is also conceivable to use a watermark in two-dimensional or three-dimensional form instead of a bar code or a QR code in order to provide readable data. A readable data carrier in the form of a QR code 57 is arranged on the support ring 45 as a representative of all the support rings shown in FIG. 12.
The removable support ring 21, 33, 39, 45, 51 can be used during the production process of the container or during the filling because of its primary function as a holding element. In addition, data which are relevant to the production process can be uploaded or read onto the RFID transponder 55 during the production process or during its filling. When leaving the production or the filling system, the support ring can
21,33, 39, 45, 51 are removed and thus the use of material for producing the preform 11 or the container is significantly reduced. It is also conceivable for data to be loaded onto the RFID transponder 55 during the production of the container or during its filling, which data are important for the end consumer or for recycling the material used for the container. In this case, the support ring fulfills the function of the data carrier, which can be easily separated from the container, in order to use the advantages of an electronic, rewritable storage medium on the one hand and to enable the container to be reused without any problems.
Legend [0081]
Preform
Elongated preform body
ground
Neck section
Pouring opening
Support ring in a first embodiment
Groove
Bottom of the groove
27a, 27b First and second side flanks of the groove
Inner diameter of the support ring
Diameter of the bottom
Opening angle of the support ring 21
Support ring in a second embodiment
34a, 34b parts of the support ring 33
35a, 35b First and second joint of the support ring
37a, 37b bolts
Support ring in a third embodiment
41a, 41b parts of the support ring 39
Magnets
Support ring in a fourth embodiment, lamellar ring
Slats
Indentations
Support ring in a fifth embodiment, Seeger ring
CH 715 250 A2
External thread
Annular heel
Attack holes
Electronic circuit, RFID transponder
QR code

权利要求:
Claims (38)
[1]
1. Preform (11) for the production of plastic containers, in particular plastic bottles, comprising in a two-stage stretch blow molding process
- an elongated body (13),
a bottom (15), which is formed at a first longitudinal end of the body (13),
a neck section (17) which is formed on a second longitudinal end of the body (13) and lies opposite the first longitudinal end,
- A pouring opening (19) which is provided on the neck portion (17) and
- A support ring (21, 33, 39, 45, 51) which projects radially from the body and separates the neck section from the body, characterized in that the support ring (21, 33, 39, 45, 51) is a separate support element , can be fixed in a form-fitting manner on the preform (11).
[2]
2. Preform according to claim 1, characterized in that the support ring (21,33, 39, 45, 51) from the preform (11) is removable.
[3]
3. Preform according to one of claims 1 or 2, characterized in that the support ring (21,33, 39, 45, 51) has a data carrier which is at least a carrier of an identification number.
[4]
4. Preform according to claim 3, characterized in that the data carrier carries information such as time and place of production, preform material and information on reusability, information on the contents or information regarding a deposit system relating to the plastic container.
[5]
5. Preform according to claim 4, characterized in that the data carrier is realized in the form of an electronic circuit (55).
[6]
6. Preform according to claim 5, characterized in that the electronic circuit (55) is positioned inside or on the support ring (21, 33, 39, 45, 51).
[7]
7. Preform according to claim 5 or 6, characterized in that the electronic circuit is an RFID transponder (55).
[8]
8. Preform according to claim 3 or 4, characterized in that the data carrier in readable form for a data acquisition device, for example as a bar code or QR code (57), attached to the surface of the support ring (21,33, 39, 45, 51) is.
[9]
9. Preform according to one of the preceding claims, characterized in that on the preform (11) at the transition from the neck portion (17) to the body (13) in the circumferential direction of the preform (11) extending groove (23), preferably one Annular groove is provided, in which the support ring (21, 33, 39, 45, 51) can engage.
[10]
10. Preform according to claim 9, characterized in that the groove (23) comprises a base (25) and a first and second flank (27a, 27b) adjoining the base (25).
[11]
11. Preform according to claim 10, characterized in that the inner diameter (29) of the support ring (21,33, 39, 45, 51) substantially corresponds to the diameter of the base (25).
[12]
12. Preform according to one of claims 9 to 11, characterized in that the support ring (21) is open and can be expanded such that it can be plugged onto the preform (11) by being accommodated in the groove (23).
[13]
13. Preform according to claim 12, characterized in that the support ring (21) has an opening angle (32) of less than 180 degrees and greater than 0 degrees, preferably less than 160 degrees and greater than 30 degrees and particularly preferably less than 120 Degrees and greater than 70 degrees.
[14]
14. Preform according to one of the preceding claims, characterized in that the support ring (33) has at least one joint (35a, 35b) around which it can be opened and closed.
[15]
15. Preform according to one of claims 1 to 12 or 14, characterized in that the support ring (33, 39) comprises two semicircular segments which can be fastened to one another.
[16]
16. Preform according to one of the preceding claims, characterized in that the support ring (21,33, 39, 45, 51) consists of a plastic-coated spring steel, metal or plastic.
CH 715 250 A2
[17]
17. Preform according to one of the preceding claims, characterized in that the support ring (45) consists of an elastic material and has a plurality of slats (47) which extend in the radial direction and can be bent open in the axial direction of the preform.
[18]
18. Preform according to one of the preceding claims, characterized in that on the neck portion (17) fastening means (52, 53) are formed for the form-fitting fixing of a closure part equipped with corresponding engagement means.
[19]
19. Preform according to one of the preceding claims, characterized in that the body (13) has an outer diameter which the outer diameter of the neck portion (17) by more than 5 mm, preferably by more than 10 mm and particularly preferably by more 15 mm protrudes.
[20]
20. Preform according to one of the preceding claims, characterized in that the ratio of the outer diameter of the body to the outer diameter of the neck portion is between 1.05 and 0.7.
[21]
21. Preform according to one of the preceding claims, characterized in that the body (13) has a wall thickness of 3 mm, preferably 5 mm and particularly preferably 7 mm, the inner diameter of the neck portion (17) and the body (13) are essentially the same size.
[22]
22. Preform according to one of the preceding claims, characterized in that the preform (11) consists of polyethylene terephthalate, polypropylene or polyethylene furanoate.
[23]
23. Preform (11) for the production of plastic containers, in particular plastic bottles, in particular in a two-stage stretch blow molding process
- an elongated body (13),
a bottom (15) which is formed at a first longitudinal end of the body,
- A neck portion (17) which is formed at a second longitudinal end of the body (13) and is opposite the first longitudinal end and
- A pouring opening (19) which is provided on the neck section, characterized in that the preform (11) is free of a support ring (21, 33, 39, 45, 51) and that between the body (13) and the neck section (19) a fastening means (23) for the form-fitting fixing of a support ring (21, 33, 39, 45, 51) equipped with a corresponding engagement means is formed.
[24]
24. Preform according to claim 23, characterized in that the fastening means is a groove (23) extending in the circumferential direction of the preform (11).
[25]
25. Support ring for attachment to a preform (11), which preform (11) has a neck section (17) and a body (13) adjacent to the neck section (17) and which preform (11) is used to produce a plastic container, the Support ring (21, 33, 39, 45, 51) can be fastened between the neck section (17) and the body (13), characterized in that the support ring (21, 33, 39, 45, 51) has a data carrier, which at least Carries an identification number.
[26]
26. Support ring according to claim 25, characterized in that the data carrier is an electronic circuit (55) which is positioned inside or on the support ring (21, 33, 39, 45, 51) or in readable form for a data acquisition device, for example as Bar code or QR code (57) is attached to the surface of the support ring (21, 33, 39, 45, 51).
[27]
27. Plastic container manufactured in a two-stage stretch blow molding process from a preform (II) according to one of the preceding claims with a body portion and an associated container neck, the geometry of which essentially corresponds to the geometry of the neck portion (17) of the preform (11), characterized that between the body section and the container neck a fastening means for the form-fitting fixing of a support ring (21, 33, 39, 45, 51) equipped with a corresponding engagement means is formed.
[28]
28. Plastic container according to claim 27, characterized in that the ratio of the container neck diameter to the outer diameter of the body section is 3 to 6.
[29]
29. Process for the production of plastic containers, in particular plastic bottles, in a two-stage stretch blow molding process, and for providing data relating to the plastic containers produced, with the two-stage stretch blow molding process
- In a first method step, a preform (11) with an elongated body (13), a bottom (15) which is formed at a first longitudinal end of the body (13), a neck portion (17) which is at a second longitudinal end of the body (13) is formed and is opposite the first longitudinal end and a pouring opening (19), which is provided on the neck portion (17), is injection molded and
- In a second process step, the preform (11) is heated again, introduced into a mold and first stretched in the mold by a stretching mandrel and then inflated with compressed air for radial stretching, and the finished plastic bottle is removed from the mold , characterized in that a support ring (21, 33, 39, 45, 51) is positively attached to the preform (11) between the body (13) and the neck section (17) or
CH 715 250 A2 that the support ring (21, 33, 39, 45, 51) is manufactured together with the preform (11) in a common injection mold using a 2-component injection molding process.
[30]
30. The method according to claim 29, characterized in that during the production of the support ring (21, 33, 39, 45, 51) a data carrier in the form of an electronic circuit (55) is inserted into the injection mold and by the support ring (21, 33 , 39, 45, 51) is encapsulated.
[31]
31. The method according to claim 29 or 30, characterized in that the support ring (21,33, 39, 45, 51) in the injection molding machine, preferably during the cooling process, or after removing the preform from the injection molding machine attached to the preform (11) if the support ring (21, 33, 39, 45, 51) is manufactured separately from the preform (11).
[32]
32. The method according to any one of claims 29 to 31, characterized in that the support ring (21,33, 39, 45, 51) is removed from the plastic container when the mold is closed or after the plastic container has been removed from the mold.
[33]
33. The method according to claim 32, characterized in that the support ring (21,33, 39, 45, 51) is removed from the molding tool on a conveyor belt during the transport step of the plastic container or from the plastic container during the packaging step of the plastic container.
[34]
34. The method according to any one of claims 30 to 33, characterized in that data are read into the data memory during the production process of the plastic container and / or during the filling process of the plastic container.
[35]
35. The method according to any one of claims 30 to 34, characterized in that data is read from the data memory during the production process of the plastic container and / or during the filling process of the plastic container.
[36]
36. The method according to any one of claims 30 to 35, characterized in that data is read from the data memory during the use of the plastic container and / or during the recycling of the plastic container.
[37]
37. The method according to any one of claims 29 to 36, characterized in that the support ring (21,33, 39, 45, 51) is removed from the plastic container after the production of the plastic container or after the plastic container has been filled.
[38]
38. The method according to any one of claims 29 to 37, characterized in that the support ring (21,33, 39, 45, 51) is removed from the plastic container before disposal or during recycling of the plastic container.
CH 715 250 A2

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同族专利:

公开号 | 公开日

EP3833521A1|2021-06-16|

CH715243A1|2020-02-14|

引用文献:

公开号 | 申请日 | 公开日 | 申请人 | 专利标题

SE8000812L|1980-02-01|1981-08-02|Plm Ab|CONTAINER WITH GREPPRING|

US4715504A|1985-10-02|1987-12-29|Owen-Illinois Plastic Products Inc.|Oriented plastic container|

WO2000012397A2|1998-08-27|2000-03-09|Practicus Corporation|Bottle carrying apparatus|

US20040146673A1|2003-01-24|2004-07-29|Larsen W. Bruce|Container preform assembly and method of manufacture|

US20060073288A1|2003-08-22|2006-04-06|Garman Thomas B|Securement of attachments to molded plastic preforms or containers|

EP1880824A1|2006-07-20|2008-01-23|Aisapack Holding SA|Preform for manufacturing a packaging by blow moulding, method for blow moulding a preform and manufactured packaging|

DE102009007906B4|2009-02-06|2015-02-12|Khs Gmbh|Holding device and handling method for workpieces made of a thermoplastic material|

法律状态:

优先权:

申请号 | 申请日 | 专利标题

CH00977/18A|CH715243A1|2018-08-10|2018-08-10|Preform for the production of a plastic container and plastic container produced from the preform.|PCT/EP2019/070500| WO2020030474A1|2018-08-10|2019-07-30|Preform and plastic container|

EP19749295.2A| EP3833521A1|2018-08-10|2019-07-30|Preform and plastic container|

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