• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The new method comprises a first stage in which a fold (5) is made along the longitudinal edge (6) of the first sheet (3) and at the same time an "S" fold (7) is practiced along of the longitudinal edge (8) of the second sheet (4). In the second stage, the middle section of the "S" fold is undone. The first stage is carried out by means of a device that includes five elements, which in a single step performs the fold (5) and the "S" fold (7). (Machine-translation by Google Translate, not legally binding)
    公开号:ES2800098A1
    申请号:ES202030548
    申请日:2020-06-08
    公开日:2020-12-23
    发明作者:Sanchez Juan Berenguel
    申请人:Construcciones Electromecanicas del Ter SA；
    IPC主号:
    专利说明:

    [0002] Method for internal hemming of a plastic bag and device for carrying out this method
    [0004] Field of the invention
    [0006] The present invention refers to a method for making the internal hems where the closure and transport tape of a plastic bag is housed. This type of bag is made from a strip of thermoplastic material folded over itself and is served in rolls of several bag units.
    [0008] Another aspect of the invention relates to a mechanism for hemming according to the method described in this invention.
    [0010] Prior state of the art
    [0012] Garbage bags made from a strip of thermoplastic material are known and are provided with a tape to facilitate their closure and transport.
    [0014] Bags of this type are described in patents US4624654, US5057065, US4558463 and FR2291025.
    [0016] These bags have a body made from a sheet of thermoplastic material folded on itself that is closed on its sides, leaving an opening in the upper part, where the closure and transport tape is arranged housed in hems formed with the sheet itself. made of thermoplastic material.
    [0018] It is convenient that the container hems of the tape are oriented towards the inside, so that the external surface is completely smooth and uniform, facilitating the printing of ornamentation and legends.
    [0020] These hems are made during the bag's manufacturing process, and there are several manufacturing methods.
    [0022] Patent US4624654 describes a method for making plastic bags, where to form hems facing the inside of the bag, a strip of thermoplastic material is started, folded along its central axis, which after being unwound, is opened to make a fold of 180 ° from the sides as shown in figure 3 of the document, thus forming the hems in which the closure and grip tape will be inserted.
    [0024] The thermoplastic sheet, with the hems made and the tapes inserted, is re- fold along its central axis, overlapping again the two halves of the band, making the hems coincide on the inside as shown in figure 9 of the document. Finally, they are closed on the sides with weld lines perpendicular to the band, so the bag is finished.
    [0026] This method has the disadvantage that, when the thermoplastic sheet is folded again at its central axis, a certain amount of air is trapped and cannot be expelled. As a consequence, the bags with air trapped inside cannot be rolled hermetically, so the volume of the rolls is greater than desired.
    [0028] As a solution to this problem, patent EP3393782 describes a process that also starts with a strip of thermoplastic material folded along its central axis, in which it is not necessary to open the strip of material to form the hems of the bag.
    [0030] As can be seen in figure 5a of document EP3393782, the method starts from a thermoplastic sheet folded along its central axis on which the following folds are made:
    [0031] First, part of one half of the thermoplastic sheet is folded back.
    [0032] Second, the free side edge of the previously folded part is folded back, leaving a first hem in an inverted position for use.
    [0034] Third, the edge of the second half of the thermoplastic sheet is folded, leaving the second hem of the bag configured.
    [0036] Finally, the first made hem is folded so that it overlaps the second hem.
    [0038] Since it is not necessary to open the web of material to form the hems, this procedure solves the problem of air trapped in the bags, however, it brings a new disadvantage.
    [0040] Each bend is made by an independent bending device, so between three and four bending devices are necessary, as well as a minimum of four to five fixing rollers, which are located at the entrance and exit of each bending device to fix the fold.
    [0042] As a consequence, the mechanical chain to make the hems according to the method described in document EP3393782 is very long, requiring a large space for its implementation in the bag manufacturing line, the threading of the band in the devices being difficult, which requires meticulous calibration and synchronization work, all these settings having to be modified in all devices each time the bag size to be made is modified .
    [0044] Lastly, the long path of the thermoplastic material strip through the four folding devices and the five fixing rollers increases the risk of unfolding during the advance of the material.
    [0046] Object of the invention
    [0048] An object of the invention is to provide a method for hemming a plastic bag without the need to fully open the thermoplastic sheet during the manufacturing process and with a lower number of steps or stages than known methods. Specifically, a method for making two hems in the internal area of the plastic bag with only two steps or stages.
    [0050] A further objective of the invention is to provide a folding device suitable for making plastic bags according to the new claimed method, capable of acting on the two sheets of the thermoplastic band at the same time.
    [0052] By implementing the method and device of the invention, the space required in the bag manufacturing line to make the hems is reduced compared to that described in the state of the art and, consequently, the machine is more compact and simple. .
    [0053] The threading operation of the thermoplastic material web is also simplified and the risk of unfolding during the advance of the material is reduced.
    [0055] Explanation of the invention and advantages
    [0057] Starting from a strip of thermoplastic material folded along its central axis forming a pair of superimposed sheets, the method of the invention simplifies the making of the internal hems of a plastic bag by comprising only two steps.
    [0059] In the first stage, the two sheets of the thermoplastic material strip are intervened at the same time.
    [0061] A fold is made along the longitudinal edge of the first sheet with a width greater than that of the closure and transport tape, and at the same time an "S" fold is made along of the longitudinal edge of the second sheet, in which the upper section has a width equal to that of the fold made on the longitudinal edge of the first sheet, while the middle section has a width equal to or slightly greater than that of the upper section.
    [0063] The surface of the sheets not affected by the bends remains in contact, so there is no possibility of air entry.
    [0065] In the second stage, the middle section of the "S" fold is undone by folding it over the folded edge of the opposite sheet.
    [0067] The first stage of the method is carried out by means of the folding device, also object of the invention, which comprises a set of five plates between which the longitudinal edges of the two sheets of the thermoplastic material strip move without affecting the rest of the band, so that in a single step the hem of the lower sheet is formed in its operative position and the hem of the upper sheet in an inverted position.
    [0069] The second stage is carried out by means of a conventional folding device that only affects one sheet of the material web and in it the hem made in the previous stage is repositioned to place it in an operative position facing the opposite sheet hem.
    [0071] Another aspect of the invention relates to a device for hemming a plastic bag provided with strips for closure and transport made according to the method of the invention.
    [0073] The new device includes five elements by means of which it is performed in a single step, a fold along the longitudinal edge of the first sheet and an "S" fold along the longitudinal edge of the second sheet of the material band. thermoplastic.
    [0075] Of these five elements, two act on the first sheet and the remaining three on the second.
    [0077] The device has two parallel skid plates, of which one acts on the first sheet and the other on the second.
    [0079] Both skid plates have an inlet section and an outlet section contained in different inclined planes.
    [0080] In each case, the input section has a lateral edge inclined in the direction of the longitudinal axis of the piece, through which the sheet surrounds the skid plate, passing from one side to the other.
    [0081] The entry section of the skid plate of the second sheet is ahead of the entry section of the skid plate of the first sheet, so that the longitudinal edge of the second sheet begins to rotate before that of the first sheet. Thus, the passage from one side of the plate to the other is carried out progressively.
    [0083] The outlet section of the skid plate associated with the first sheet has a treading plate, with a lateral edge inclined in the direction of the axis, which completes the rotation of the longitudinal edge of the first sheet, so that at the exit it has already been formed the hem of the first sheet in use position.
    [0085] The outlet section of the skid plate associated with the second sheet includes an intermediate tread plate. The intermediate pressing plate has a lateral edge inclined in the direction of the longitudinal axis of the strip, which generates the middle section of the "S" fold. It also incorporates a vertical skate aligned with the inclined edge, which leads the longitudinal edge of the second sheet. towards a final pressing plate. The final pressing plate has an inclined lateral edge in the direction of the longitudinal axis of the strip, which completes the rotation of the longitudinal edge of the second sheet to generate the upper section of the "S" fold, so that at the exit the hem of the second sheet has been formed in an inverted position.
    [0087] Drawings and references
    [0089] In order to illustrate what we have discussed so far, the present specification is accompanied by some drawings in which an exemplary embodiment which is only illustrative and not limiting of the practical possibilities of the invention has been represented.
    [0091] Figure 1 represents a diagram of the movements of the thermoplastic material strip in the first stage of the method.
    [0093] Figure 2 represents a diagram of the movements of the thermoplastic material strip in the second stage of the method.
    [0095] Figure 3 represents a succession of views of the strip of thermoplastic material in the initial state, after the first stage of the method and after the second stage of the method.
    [0096] Figure 4 represents a perspective view of the changes made in the second sheet during the first stage of the method of the invention.
    [0098] Figure 5 represents a perspective view of the changes made in the first sheet during the first stage of the method of the invention.
    [0100] Figure 6 represents an exploded view of the device of the invention.
    [0102] Figure 7 represents a perspective view with hidden lines of the device with the inlet section in the foreground.
    [0104] Figure 8 represents a perspective view with hidden lines of the device with the outlet section in the foreground.
    [0106] Figure 9 represents a front view of the inlet section of the device of the invention in which the development of the thermoplastic material strip can be seen.
    [0108] Figure 10 represents a perspective view of the device of the invention with the inlet section in the foreground and in which the development of the strip of thermoplastic material can be seen through it.
    [0110] Figure 11 represents a front view of the outlet section of the device of the invention in which the development of the thermoplastic material strip can be seen.
    [0112] Figure 12 represents a perspective view of the device of the invention with the outlet section in the foreground and in which the development of the thermoplastic material band is seen through it.
    [0114] Figure 13 represents a view of the skid plate of the second sheet.
    [0116] Figure 14 represents a view of the skid plate of the first sheet.
    [0118] Figure 15 represents a view of the final tread plate.
    [0120] Figure 16 represents a view of the intermediate pressing plate.
    [0122] Figure 17 represents a view of the tread plate.
    [0124] The following references are indicated in these figures:
    [0126] 1- Strip of thermoplastic material
    [0127] - Central axis
    [0128] - First sheet
    [0129] - Second sheet
    [0130] - Fold
    [0131] - Longitudinal edge
    [0132] - Fold in "S"
    [0133] - Longitudinal edge
    [0134] - Upper section
    [0135] 0- Middle section
    [0136] 1- First hem
    [0137] 2- Second hem
    [0138] 3- Skate plate
    [0139] 4- Skate plate
    [0140] 5- Entrance section
    [0141] 6- Exit section
    [0142] 7- Inclined lateral edge 8- Tread plate
    [0143] 9- Inclined lateral edge 0- Intermediate pressing plate 1- Inclined lateral edge 2- Vertical skid
    [0144] 3- Final tread plate 24-Inclined lateral edge
    [0146] Presentation of a preferred embodiment
    [0148] The present method to make the internal hems in a plastic bag, starts with a strip of thermoplastic material (1) folded by its central axis (2) forming a first sheet (3) and a second sheet (4) superimposed and in contact total. This method comprises two different stages.
    [0150] In a first stage, a fold (5) is made along the longitudinal edge (6) of the first sheet (3) with a width "A" greater than that of the closure and transport tape to contain. This fold (5) originates the first hem (11). At the same time an "S" fold (7) is made along the longitudinal edge (8) of the second sheet (4), in which the upper section (9) presents a width "A" equal to that of the fold (5), while the middle section (10) has a width "B" slightly greater than that of the upper section (9).
    [0152] The "S" fold (7) gives rise to the second hem (12) which upon completion of the first stage is in an inverted position.
    [0154] In the second stage, the middle section (10) of the "S" fold (7) is undone by folding it over the first sheet (3) as shown in figure 2.
    [0156] Another aspect of the invention refers to a device for hemming a plastic bag made according to the method of the invention described, comprising five elements by means of which a fold (5) is made in a single step, along the longitudinal edge (6) of the first sheet (3) and an "S" fold (7) along the longitudinal edge (8) of the second sheet (4).
    [0158] The device comprises a skid plate (13) that acts on the first sheet (3) and a skid plate (14) that acts on the second sheet (4) arranged in parallel and that have an inlet section (15) and a section outlet (16) contained in different planes are inclined by an angle "C" which in the example shown is 135 °.
    [0160] Each inlet section (15) has an inclined lateral edge (17) through which the sheet surrounds the skid plate, passing from one side of it to the other.
    [0162] The entry section (15) of the skid plate (14) is advanced with respect to the entry section (15) of the skid plate (13) so that the second sheet (4) begins to rotate before the first sheet (3 ).
    [0163] The outlet section (16) of the skid plate (13) has a tread plate (18) with an inclined lateral edge (19) that completes the rotation of the longitudinal edge (6) of the first sheet (3), forming the first hem (11) in use position.
    [0165] The outlet section (16) of the skid plate (14) has an intermediate tread plate (20), with an inclined side edge (21) that generates the middle section (10) of the "S" fold (7), and with a vertical skid (22) aligned with the inclined lateral edge (21), which leads the longitudinal edge (8) of the second sheet (4) towards a final tread plate (23) that includes an inclined lateral edge (24), which completes the rotation of the longitudinal edge (8) to generate the upper section (9) of the "S" fold (7) generating the second hem (12) in an inverted position.
    权利要求:
    Claims (8)
    [1]
    1. - Method to make the internal hems in a plastic bag that starts from a strip of thermoplastic material (1) folded by its central axis (2) forming a first sheet (3) and a second sheet (4) superimposed and in total contact between them, characterized in that it comprises:
    • A first stage in which a fold (5) is simultaneously made along the longitudinal edge (6) of the first sheet (3) with a width "A" greater than that of the closure and transport tape to contain, which originates the first hem (11), and an "S" fold (7) along the longitudinal edge (8) of the second sheet (4), in which the upper section (9) has a width "A ”Equal to that of the fold (5), while the middle section (10) has a width" B "equal to or slightly greater than the width" A "of the upper section (9), so that the" S "fold (7 ) forms the second hem (12).
    • A second stage in which the middle section (10) of the "S" fold (7) made in the second sheet (4) is undone by folding it over the first sheet (3) and facing the second hem (12) to the first hem (11).
    [2]
    2. - Device to hem a plastic bag according to the method of the invention characterized in that it includes a skid plate (13) that acts on the first sheet (3) and a skid plate (14) that acts on the second sheet (4) arranged in parallel and presenting in both cases an inlet section (15) and an outlet section (16) contained in different inclined planes at an angle "C".
    [3]
    3. - Device for making the hems of a plastic bag according to claim 2 characterized in that each entry section (15) has an inclined lateral edge (17) in the direction of the longitudinal axis of the piece, by which the sheet surrounds the plate skate going from one side of this to the other.
    [4]
    4. - Device to hem a plastic bag according to claims 2 and 3, characterized in that the entry section (15) of the skid plate (14) is ahead of the entry section (15) of the skid plate (13 ).
    [5]
    5. - Device for making the hems of a plastic bag according to claim 2 characterized in that the outlet section (16) of the skid plate (13) has a treading plate (18), with an inclined side edge (19), which completes the rotation of the longitudinal edge (6) of the first sheet (3) on the skid plate (13) to form the first hem (11).
    [6]
    6. - Device for making the hems of a plastic bag according to claim 2, characterized in that the outlet section (16) of the skid plate (14) has an intermediate treading plate (20), with an inclined side edge (21), generated by the middle section (10) of the "S" fold (7) upon completing the rotation of the longitudinal edge (8) of the second sheet (4) on the skid plate (14).
    [7]
    7. - Device for making the hems of a plastic bag according to claim 6 characterized in that the intermediate tread plate (20) includes a vertical skid (22) aligned with the inclined side edge (21), which leads from the longitudinal edge (8) from the second sheet (4) towards a final tread plate (23).
    [8]
    8. Device to hem a plastic bag according to claim 7, characterized in that the end plate (23) has an inclined side edge (24), which completes the rotation of the longitudinal edge (8) on the intermediate plate ( 20) to generate the upper section (9) of folding in "S" (7) that together with the middle section (10) forms the second hem (12).
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    同族专利:
    公开号 | 公开日
    ES2800098B2|2021-05-11|
    DE102021114473A1|2021-12-09|
    PL438083A1|2021-12-13|
    FR3111093A1|2021-12-10|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US3406610A|1965-08-17|1968-10-22|Bertie C. Golden|Plastic drawstring bag machine|
    US5057065A|1989-12-08|1991-10-15|Reynolds Metals Company|Process for making draw tape bags with integrally formed draw tapes|
    WO2010086794A1|2009-01-29|2010-08-05|Lohia Starlinger Limited|A device and a method for making a double fold|
    EP3393782B1|2015-12-22|2020-02-05|Roll-o-Matic A/S|Method and apparatus for making draw strip bags|
    法律状态:
    2020-12-23| BA2A| Patent application published|Ref document number: 2800098 Country of ref document: ES Kind code of ref document: A1 Effective date: 20201223 |
    2021-05-11| FG2A| Definitive protection|Ref document number: 2800098 Country of ref document: ES Kind code of ref document: B2 Effective date: 20210511 |
    优先权:
    申请号 | 申请日 | 专利标题
    ES202030548A|ES2800098B2|2020-06-08|2020-06-08|Method for internal hemming of a plastic bag and device for carrying out this method|ES202030548A| ES2800098B2|2020-06-08|2020-06-08|Method for internal hemming of a plastic bag and device for carrying out this method|
    FR2105809A| FR3111093A1|2020-06-08|2021-06-02|Method for making inner hems in a plastic bag and device for carrying out this method|
    DE102021114473.6A| DE102021114473A1|2020-06-08|2021-06-05|METHOD FOR MANUFACTURING INTERIOR HEMS IN A PLASTIC BAG AND DEVICE FOR CARRYING OUT THIS METHOD|
    PL438083A| PL438083A1|2020-06-08|2021-06-07|Method of making inner edges in a plastic bag and a device for carrying out this method|
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