• 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:
    In the packaging field certain types of packages are manufactured from pre-shaped, cylindrical casings made from a heat-shrinkable laminate. The casings are formed by winding a material sheet around a mandrel and subsequent sealing together of the overlapping ends of the sheet. However, because of the stiffness of the material the leading end of the sheet protrudes tangentially from the mandrel during the winding and prevents an accurate adaptation of the material sheet to the surface of the mandrel. According to the method and arrangement of this invention this disadvantage is avoided in that the leading end of the sheet is pre-heated on the side facing the mandrel to such a degree, that the shrinking is initialled. The shrinking of one side only results in that the leading end of the material sheet is given a curved shape with a radius that coincides with the radius of the mandrel, and consequently the leading end is no longer an obstacle to the winding.
    公开号:SU967267A3
    申请号:SU782703679
    申请日:1978-12-22
    公开日:1982-10-15
    发明作者:Пупп Хервиг；Биргер Андерссон Отто；Нильссон Ян-Эрик
    申请人:Тетра Пак Интернэшнл Аб (Фирма)；
    IPC主号:
    专利说明:

    mandrels. With additional heating, the free end of the shell softens off so that when pressure is applied it is welded to the edge of the plate. This completes the formation of the container body. During manufacture, the laminate is wound around the mandrel of the forming tool, the sheet being fed to the tool mainly tangentially, after which the front edge of the sheet is mechanically held against the surface of the sleeve of the forming tool and the tool rotates approximately 360. The mechanical restraint is located on the forming tool and has The stern of the small pin, which is axially on, worn to the tool and has the ability to move - between two positions (open ytoe position - spaced from the surface of the liner;. tsolozhenie closed in contact with the liner poverhn.ostyu). The front edge of the sheet is introduced into the space between the tool case and the holding pin, takes the open position, after which the pin moves to the closed position so that the end of the sheet is held by the raft. To perform the subsequent welding of the ends of the wound sheet, it is necessary that the sheet, before fixing its front edge, be advanced into such a position that the fixing pin engages a certain part of the sheet so that a free end is formed, large enough to form a longitudinal joint after the end of winding. After clamping between the clamping pin and the surface of the sleeve, the free end extends tangentially with respect to the surface of the sleeve of the forming device. When the sheet, after turning the forming tool naviverr around the tool, the free end of the sheet prevents the back edge of the sheet from contacting the surface of the sleeve of the forming tool from the moment the rear end comes to rest against the front edge of the sheet, located at a distance from the sheet surface. After heating the two ends, they are squeezed together to form the joint with overlap under the action of heat, the excess material appears due to poor contact of the sheet with the surface of the sleeve, which causes an increase in the diameter of the casing after brewing, which negatively affects further operations. This disadvantage increases with, when the shell is made of a rigid and thick material, for example a fibrous material from polystyrene, comprising a central layer of foam polystyrene, which is rather thick and coated on both sides with a thin homogeneous layer. Attempts to eliminate these drawbacks have been focused on designing the holding pin and the surface of the liner of the forming tool, connected to the holding pin, in order to search for mechanical means for obtaining the free ends so that they exactly take the shape of the sleeve. However, these conditions did not bring much success. Closest to the invention is a device for the manufacture of products from a sheet of thermoplastic material, comprising a heater made in the form of a hollow body with a heating element placed inside it, provided with successive nozzles for preliminary and final heating of the material with heated air. The material being joined is heated in advance. until the softening temperature, and then finally - to the welding temperature of this material C2j. This device provides a high-quality connection of flat sheets of material, but with the help of such a device it is impossible to make hollow products of the type of strand from a material that shrinks when heated,. . The aim of the invention is to improve the quality of the products and expand the technological capabilities of the device by providing the manufacture of products like shells. The goal is achieved in that according to the method of manufacturing shells of thermoplastic sheet material, which shrinks when heated, by connecting the butt joint by welding, before winding the billet, from the side facing the mandrel, is heated along the length to the softening temperature of the material, with the initial portion of the billet additionally heated to. temperatures above the shrinkage temperature of the material. ... A device containing a heater, made in the form of a hollow body with a heating element placed inside it, equipped with successive nozzles for preliminary and final heating of the material with heated air, is provided with a mandrel mounted behind the final nozzle
    heating in the feed direction of the material.
    Figure 1 (positions a to e) schematically shows the successive steps of converting the sheet material into a sheath according to the proposed method; Fig. 2 shows a preferred embodiment of the device according to the invention, a longitudinal section.
    The device comprises a cylindrical mandrel 1, a retaining material 2, which is installed with the possibility of reciprocating relative to the mandrel, occupying the position in which it is either on the mandrel 1, or at some distance relative to it, and the heater, made in the form of a hollow body 3 with a heating element 4 placed inside it, supplied with successively arranged preheating nozzle 5, and a final heating nozzle 6, the nozzle having a nozzle b Thomas slit, a longitudinal direction which is parallel to the axis of the mandrel and on the channeling-tangensalno the mandrel. The working length of the pre-heating nozzle 5 is slightly less than the length of the sheet blank, and the working length of the nozzle b of the final heating is 1/3 the length of the nozzle 5, while the total length of both nozzles corresponds to the length of the blank. The width of both nozzles is equal to or slightly larger than the width of the heated surface of the workpiece . The cavity of the housing 3. Is divided by partitions 7 into communicating chambers, in the upper-from. heat exchanger 8 is installed, and heating element 4 is installed at the bottom. Inside housing 3 a spool 9 is installed, passing through the holes in the walls of the nozzles 5 and 6 and the walls of the heat exchanger 8, equipped with valves 10 and 11, which are mounted with the ability to move in three positions . Valves 10 and 1-1 garden vehicle for saddles 12, 13 and 14, made in the walls of the nozzles and the heat exchanger, moreover, the movement of valve 10 down along the axis of the spool is limited by the IS stopper, and valve 11 is rigidly fixed. Sirovan on zolotnika. Valves 10. and 11 can be installed in three positions, with the first position corresponding to the moment when. the valve 11 sits on the saddle 13 and the flow of hot air is completely blocked in both nozzles, and the valve 10 is raised on the spool 9 to the upper position and the hot air can freely escape through the heat exchanger 8 to the atmosphere (described
    the position of the valves is shown in figure 2 by the dotted line). The first position corresponds to when the workpiece is in position a (Fig. 1).
    In the second position, the spool 9 is in an intermediate position and passes a stream of hot air to us dku b final heating and nosadku 5 preheating. In this position, the spool 9 is lowered so that the valve 11 is in an intermediate position between the seats 13 and 14, while the valve 10 is installed on the seat 12 and prevents air from passing through
    5 is a heat exchanger 8. In this position, the valves are shown in solid lines in FIG. 2. This working position corresponds to the position b (figure 1) during the heating of the stationary workpiece
    0
    and during the twisting phase of the workpiece - the position of g (Fig. 1).
    In the third working position, the entire stream of hot air is paged to the nozzle of the final heating. AT
    In this position, the spool is in the lower position, and the valve 11 moves and takes up position on the seat 14; The valve in FIG. 2 is shown by a dashed line. Movable valve
    0 10 due to the possibility of moving relative to the spool 9 remains in the same position on the seat 13. As a result, the valve 10 blocks the flow of combustible air and the entire flow of hot air passes to the 5th charge of the final heating. This operating position of the valves 10 and 11 take on the one hand, when the nozzle b of the final heating affects the initial part of the workpiece
    0 (figure 1, position c) and on the other hand during intensive heating of the two overlapped ends of the workpiece (figure 1, position e).
    The design of the device with fixed nozzles of heating, in which hot air is distributed in accordance with a certain order, forms the basis of a stable cycle and makes it possible to reconfigure by 0; the current of the hot air is separate; the very short working phases described above. Fast reconfiguration of hot air flow is also facilitated by a valve spool.
    five
    The proposed device involves the use of an air-type heater, which is an optimal solution for the production of shells made of laminated material, including foam plastic layers. However, this does not mean that with P, other materials with different materials cannot be used with another working medium. In certain cases, for example, can be used
    five
    Heater using infragt red light.
    Depending on whether the laminate is virgin or non-trivial, or contains layers of various plastic materials or depending on other factors, the whole sheet may be preheated, i.e. Both sides of the sheet are heated, which can easily be carried out in accordance with the invention, for which hot-air, directed into the pre-heating nozzles, also goes to the opposite side of the sheet.
    Manufacturing of thermoplastic shells that shrink when the material is heated according to this method and with the aid of the device proposed. The sheet is made tangentially with respect to the mandrel 1 The sheet has a length that allows you to form a rather wide part of the joint overlap after winding a sheet around an oprak The direction of sheet feeding is shown in figure 1 (position a and arrow). the position shown, the mandrel is stationary, the retaining 2 is at a distance of. mandrels 1 and both non.setting 5 and 6 heaters do not work.
    The position b indicates the moment in the formation of the sheath when the sheet stock is against the heater. The mandrel 1 is fixed and the holding pin 2 is in the open position. Hot air comes from the heater and is distributed between the nozzles 5 and b so that the sheet is heated along its entire length from the side adjacent to the heater, which coincides with the side facing the mandrel. The sheet material has a structure with a relatively thick (approximately 1 mm) central layer of expanded polystyrene, which is covered on both sides with thin (0.1-0.2 mm) layers of homogeneous polystyrene, it is heated until the homogeneous layer reaches 100 -110 ° C, which is below the softening point of the material.
    The position in corresponds to the position b completely, except for the supply of hot air. The heating of the entire length of the sheet is interrupted, i.e., the valve 11 closes the saddle 14 and the entire amount of hot air is supplied to the sheet material through the nozzle 6 of the final intensive heating. When the sheet stops at the position shown in Fig. 1 (position c), the air warms up the initial portion of the billet to a temperature above the temperature at which the shrinkage occurs. This temperature reaches 120-130 ° C, which causes the shrinkage of the side of the sheet, which is directed towards the nozzle and the sheet bends towards the mandrel 1. When heating lasts long enough, the front section of the sheet acquires a radius of curvature 1 coinciding with the radius of the cylindrical mandrel 1, intense -, the heating stops and the hot air spreads again between the preheating and final heating units as / as it was done in the stage shown in position b. (Fig, 1). At this time, the feed of the initial portion of the workpiece is resumed, and the curved end advances between pin 2 and is held in such a position when the free end of the workpiece extends beyond the pin along mandrel 1,
    In position r, the billet is shown when the supply of hot air continues through the preheating nozzles 5 and the nozzles b of the final heating, when it begins to twist around the mandrel 1, which, in turn, begins to rotate in the direction of the arrow. When the sheet material passes the heater during tightening, a occurs; further increase in temperature. the side of the sheet facing the heater up to the softening temperature of the material, approximately 110-120 0, which facilitates the shaping of the sheet to the sheet and makes it possible to accurately repeat the surface of the mandrel 1,
    In position d, when the mandrel 1, once the workpiece has been twisted, stops again, the rear end of the workpiece overlaps at the front end and is positioned against the hold-down device shown by dotted lines. The hot air supply starts again and the entire air flow now passes into the nozzles, the final heating node, which, due to its location, directs the hot air into the pocket formed between the front and rear edges of the workpiece. As a result, this material surfaces directed towards each other, is heated to a temperature higher than the melting point, approximately 150-160 ° C. When the material reaches this temperature, a pressure device acts and squeezes together the two ends of the workpiece So that the material forms a shell, the inner diameter of which coincides with the outer diameter of the mandrel 1. At this time, the next billet is fed and the cycling chain is repeated as described, the cycle time is about 2 s,
    The proposed method allows the manufacture of shells with a constant diameter. The bending of the front end of the blank allows the sheet material to accurately repeat the entire surface of the mandrel. Adaptation is enhanced by preheating the side of the sheet facing the mandrel to the softening temperature of the material. If we exclude preheating of the specified surface or heating to an insufficiently high temperature, the sheet layer facing the mandrel will not curl — and a large number of cracks and folds will form in a direction axial to the mandrel, thus, firstly, internally. the surface of the skin will not be cylindrical, and secondly, the accuracy of the dimensions of the shell will be unsatisfactory.
    The proposed method is particularly suitable for making laminated shells which includes a relatively thick layer of foam plastic that is located in the center, since such a material easily cracks when it is bent beyond a certain limit. For this type of material, it is also easy to dose the amount of heat required to obtain the required bending of the front end of the sheet, with a porous plastic located in the center of the sheet material, which acts as an insulator and prevents the heat from spreading to the adjacent layers. Intensive heating can easily limit the heating of the layer or layers that are adjacent to the forming tool, the mandrel, which makes it possible to adjust the heating, and therefore simple adjustment the process of bending is such that: the reschius of curvature is equal to the radius of the forming tool.
    Thus, the bending of the front end of the sheet material is carried out completely, without any mechanical effect, which is a very big advantage, since foamy plastics can easily be destroyed when they are simultaneously subjected to heat and mechanical processing.
    An advantage of the invention is the absence of machining.
    权利要求:
    Claims (2)
    [1]
    1. A method of manufacturing shells of thermoplastic sheet material, which shrinks when heated, by winding material around the mandrel and joining the butt joint by welding, characterized in that, in order to improve the quality of the products, before winding, the workpiece from the side facing the mandrel is heated by up to the softening temperature of the material, and the initial part of the preform is additionally heated to a temperature higher than the temperature of the extrusion of the material.
    [2]
    2. A device for the manufacture of products from thermoplastic sheet material, comprising a heater made in the form of a hollow body with a heating element placed inside it, provided with successive nozzles for preliminary and final heating of the material with hot air, characterized in ensure the manufacture of products such as shells, it is equipped with a mandrel mounted behind the nozzle for the final heating in the direction feed material.
    Sources of information taken into account in the examination
    1. The patent of Sweden No. 381442,
    cl. B 65 R 85/72, 1976 (bip).
    2. Authors certificate of the USSR 695090, cl. In 29 C 27/02, 21.06.77 (prototype).
    but/
    /,
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    类似技术:
    公开号 | 公开日 | 专利标题
    SU967267A3|1982-10-15|Method for making shells from thermoplastic sheet material
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    US4366016A|1982-12-28|Method and apparatus for producing a plastic sleeve
    CZ301943B6|2010-08-11|Method for manufacturing foam thermoplastic product and apparfatus for making the same
    SE408782B|1979-07-09|STACKABLE CUP-LIKE CONTAINERS OF HEAT SHRINKABLE THERMOPLASTIC AND KITS FOR THE MANUFACTURE OF THE SAME
    EP0475126B1|1997-04-16|Method of forming a headed thermoplastic tube
    FR2544655A1|1984-10-26|METHOD AND DEVICE FOR MANUFACTURING HOLLOW BODIES OF DEFORMABLE PLASTIC MATERIAL
    DK150568B|1987-03-30|TUBE SHAPE CONTAINER AND PROCEDURE AND APPARATUS FOR PREPARING SAME
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    US4719069A|1988-01-12|Method for making a preform consisting of at least three layers of thermoplastic material
    GB2090558A|1982-07-14|Method of manufacture of a heat sealable fitting and fitting made by such method
    US4285750A|1981-08-25|Method for producing a plastic sleeve
    JP2710255B2|1998-02-10|Connection device and connection method for tubular plastic products
    US4219525A|1980-08-26|Method and apparatus for closing tubes
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    US4878976A|1989-11-07|Method for continuously manufacturing synthetic resin tube
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    GB1570686A|1980-07-09|Joining of polytetrafluoroethylene bodies
    US3463060A|1969-08-26|Container bodymaker
    AU733478B2|2001-05-17|Method of processing tube container and apparatus for processing the same
    JP5852632B2|2016-02-03|Hollow molding product manufacturing method and hollow molding product manufacturing apparatus
    CA1103876A|1981-06-30|Method and apparatus for closing tubes
    同族专利:
    公开号 | 公开日
    SE409562B|1979-08-27|
    JPS5495680A|1979-07-28|
    BR7808357A|1979-08-07|
    GB2011013A|1979-07-04|
    JPS642501B2|1989-01-17|
    FI67049B|1984-09-28|
    IE47762B1|1984-06-13|
    US4284448A|1981-08-18|
    AU4278178A|1979-06-28|
    DE2855076A1|1979-06-28|
    DK575878A|1979-06-24|
    SE7714734L|1979-06-24|
    DK151855C|1988-06-06|
    IT1102436B|1985-10-07|
    NL7812365A|1979-06-26|
    CH636802A5|1983-06-30|
    IE782446L|1979-06-23|
    DK151855B|1988-01-11|
    AU528264B2|1983-04-21|
    NO149918B|1984-04-09|
    IT7831287D0|1978-12-22|
    FR2412399B1|1983-12-30|
    CA1123329A|1982-05-11|
    BE872909A|1979-04-17|
    ES476275A1|1979-06-01|
    ATA915978A|1982-01-15|
    NO149918C|1984-07-18|
    NO784314L|1979-06-26|
    FR2412399A1|1979-07-20|
    GB2011013B|1982-02-24|
    US4430140A|1984-02-07|
    AR215970A1|1979-11-15|
    DE2855076B2|1980-05-08|
    AT368063B|1982-09-10|
    DE2855076C3|1981-01-15|
    FI67049C|1985-01-10|
    FI783903A|1979-06-24|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    JPS4894774A|1972-03-21|1973-12-06|
    JPS49125476A|1973-04-02|1974-11-30|
    CH611833A5|1976-03-31|1979-06-29|Tetra Pak Dev|
    JPS6127177B2|1976-04-23|1986-06-24|Nippon Petrochemicals Co Ltd|EP0048177B1|1980-09-17|1985-05-08|Raychem Limited|Process for the production of polymeric articles|
    JPH0431721B2|1982-10-05|1992-05-27|
    DE3536174C1|1985-10-10|1986-07-31|Grünzweig + Hartmann und Glasfaser AG, 6700 Ludwigshafen|Method and device for laminating a pipe insulation shell with a film|
    GB2196292A|1986-09-17|1988-04-27|Grace W R & Co|Heat-shrinkable tubular film material|
    NZ221628A|1986-09-17|1991-09-25|Grace W R & Co|Process for stuffing heat shrunk tube: two stage heating of heat shrinkable tubular film material|
    AUPO703597A0|1997-05-26|1997-06-19|King, Norman Frederick|Sheet forming apparatus|
    EP1177976B1|2000-07-03|2003-12-10|Tetra Laval Holdings & Finance S.A.|Packaging machine for continuously producing sealed packages of a pourable food product and featuring programmable photocells|
    ITBO20040491A1|2004-07-30|2004-10-30|Aetna Group Spa|MACHINE AND METHOD FOR THE FORMATION OF TUBULAR SHEETS OF PACKAGING FILM|
    US20070277923A1|2006-06-05|2007-12-06|Wood Thomas L|Method for applying a protective layer to a pipe joint|
    HUE030874T2|2008-04-10|2017-06-28|Aisapack Holding Sa|Method for manufacturing tubes by welding|
    CN104836169A|2015-04-30|2015-08-12|应德华|Dirt-proof sleeve used for protecting vehicle line joint|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE7714734A|SE409562B|1977-12-23|1977-12-23|METHODS AND DEVICES IN THE MANUFACTURE OF THERMOPLASTIC HEAT SHRINKABLE MATERIALS|
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