JP2008189357A - Package, and manufacturing method for package - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a package for which the sealing property at a focusing section is raised, and the pressure-resistance is raised, and to provide a manufacturing method which can efficiently manufacture the package for which the sealing property at the focusing section is raised, and the pressure-resistance is raised. <P>SOLUTION: This package 300 is equipped with a cylindrical film 310 and a content C. In this case, the end section 320 of the cylindrical film 310 is bundled, and a lateral sealing 322 which crosses on the focused section 324 is applied to the cylindrical film 310. The content C is filled in the cylindrical film 310 and sealed. The cylindrical film 310 is formed of two sheets of layer forming films 316 of a vinylidene chloride based resin, and a multi-layer film having an adhesive layer 318 which bonds the two sheets of the layer forming films 316 in the package 300. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a package and a method for manufacturing the package, and more particularly to a package having a cylindrical film of vinylidene chloride resin filled with contents, converged at an end, and excellent in sealing properties, and a method for manufacturing the same.

As a sealing means when sealing cylindrical films filled with contents such as sausages and stick cheeses to obtain individual packages, a method of connecting the ends of the cylindrical films with metal wire clips is known. It has been. However, in the method of connecting with a metal wire clip, the wire clip is detected in the metal detection in the product inspection, and there is inconvenience that it is impossible to detect the mixing of the metal foreign matter into the contents. A method of focusing and lateral sealing has come to be performed. In such a sealing method, the mechanical strength is reduced such that pinholes are likely to occur in the laterally sealed portion or in the vicinity thereof, and therefore the following countermeasure has been proposed (see Patent Document 1).
(1) A tape that compensates for the thickness of the tubular film in the side-sealed portion is placed on the end of the tubular film after being focused and then sealed together with the tubular film.
(2) A tape that compensates for the thickness of the tubular film at the side-sealed portion is disposed in the absence of the contents of the tubular film end that has not yet been converged. Seal after focusing.

Japanese Patent No. 2516885

However, in the case of a package manufactured by a conventional means for laterally sealing the end of a cylindrical film, the content of the contents expands due to heat treatment such as retort or boil, the internal pressure increases, and the pressure resistance of the part that is laterally sealed The heat sealing part was broken and the sealing was insufficient, and the contents were corrupted by the inflow of outside air, and there was a risk of contamination around the laterally sealed part of the package due to the leaching of moisture in the contents. If the package is torn during the retort process, it takes time to remove the dirt, which greatly reduces production efficiency.
Therefore, the present invention provides a package that has improved sealing performance at the converging part and increased pressure resistance, and a manufacturing method that can efficiently manufacture a package that has improved sealing performance at the converging part and increased pressure resistance. For the purpose.

  In order to achieve the above-mentioned object, the package according to the first aspect of the present invention is a tube having a lateral seal 322 in which end portions 320 are converged and transverse portions 324 are traversed as shown in FIG. A cylindrical film 310; and the contents C filled and enclosed in the cylindrical film 310; the cylindrical film 310 includes two vinylidene chloride resin layer-forming films 316 and two layer-forming films 316. Is formed of a multilayer film having an adhesive layer 318 for adhering to each other.

  With this configuration, the cylindrical film is formed of a multilayer film having two vinylidene chloride-based resin layer-forming films and an adhesive layer that bonds the two layer-forming films. Peeling between layers of the multilayer film at the end is prevented, sealing performance is high, and pressure strength is increased.

Moreover, in the package according to the invention described in claim 2, for example, as shown in FIG. 1, in the package described in claim 1, the adhesive layer 318 may be formed of a urethane resin.
If comprised in this way, since an adhesive bond layer is formed with urethane type resin, even if a package is exposed to high temperature like a retort food, the adhesive strength of an adhesive bond layer will be maintained.

  In order to achieve the above object, a method for manufacturing a package according to a third aspect of the present invention provides an end of a tubular film 310 filled with contents C as shown in FIGS. 1, 2 and 6, for example. A method of manufacturing a package 300 in which a portion 320 is converged and a transverse seal 322 traversed by the converged portion 324 is provided; two vinylidene chloride resin layer-forming films 316 and two layer-forming films A longitudinal sealing step S110 in which the side edges in the longitudinal direction of the belt-like film F having the adhesive layer 318 for adhering 316 are overlapped and vertically sealed to form the tubular film F1; and the contents C are filled in the tubular film F1. A filling step S120; a squeezing step of flatly forming a content absent portion 15b at predetermined intervals in the longitudinal direction of the tubular film 15a with respect to the tubular film 15a filled with the content C 130; a transverse seal 322 is linearly formed at the first two positions X1 and X2 spaced in the longitudinal direction across the absent portion 15b, or between the first two positions X1 and X2. A horizontal sealing step S140 for forming a belt-like horizontal seal; and a second portion having a longitudinal interval at the converging portion 324 and converging in the width direction of the horizontal seal 322 between the first two positions X1 and X2. A converging step S150 for heat-sealing in a linear manner at two positions Y1, Y2 or between two second positions Y1, Y2; and between the second two positions Y1, Y2; A cutting step S160 for cutting F1.

  If comprised in this way, a cylindrical film will be formed from the strip | belt-shaped film which has the layer formation film of 2 sheets of vinylidene chloride type-resins, and the adhesive bond layer which adhere | attaches 2 sheets of layer formation film, and the content is carried out to a cylindrical film Filling, laterally sealing the ends, and converging to produce a package, the peeling between the layered films of the converged and laterally sealed ends is prevented, and the sealing performance is high and the pressure strength is increased. Moreover, a package can be manufactured efficiently continuously.

  Moreover, in the manufacturing method of the package which concerns on invention of Claim 4, as shown, for example in FIGS. 2-5, in the manufacturing method of the package of Claim 3, the strip | belt-shaped film F is a vinylidene chloride type | system | group. A step S10 in which a compound made of resin is melt-extruded from the annular die 106 to form a long continuous hollow film a1; a step S20 in which the hollow film a1 is stretched by an inflation method; and the stretched hollow film a3 in the radial direction. Step S30 for crushing and folding to flattened a4; two side edges b6 and b7 in the longitudinal direction of the flattened hollow film b1 (a4) are cut out with a predetermined width, and two layer-formed films Step S60 for manufacturing b2 and b3; Step S80 for forming an adhesive layer P on one surface of one layer-forming film b2 out of the two layer-forming films b2 and b3; And a step S90 for crimping overlapping the other one layer formation film b3 of the layers forming the two in the formed adhesive layer P film b2, b3 may be manufactured with.

  When configured in this manner, the belt-shaped film is obtained by melt-extruding a compound made of vinylidene chloride resin from an annular die, stretching by an inflation method, folding and cutting off the side edges to form two layer-forming films. Since an adhesive layer is formed on one layer-forming film of the layer-forming films, and the other layer-forming film is laminated and pressure-bonded, two vinylidene chloride-based resin layer-forming films are produced. And a belt-like film having an adhesive layer for adhering them can be efficiently produced in large quantities. Here, the “hollow film” refers to a film that is long and surrounds the hollow portion like a tube, and includes a state in which the hollow portion disappears due to being crushed.

Moreover, in the manufacturing method of the package which concerns on invention of Claim 5, in the manufacturing method of the package of Claim 4, for example, as shown in FIG. 2, the process of heat-setting the stretched hollow film S50 may further be included.
If comprised in this way, since the process which heat-sets the stretched hollow film is included, the shape of two flat layer formation films is stabilized, and it prevents that the layer formation film formed after that changes with time. it can.

Moreover, in the manufacturing method of the package body based on invention of Claim 6, as shown, for example in FIG. 1, in the manufacturing method of the package body of any one of Claim 3 thru | or 5, an adhesive agent is used. The layer 318 may be formed of a urethane resin.
If comprised in this way, since an adhesive bond layer is formed with urethane type resin, even if it exposes to high temperature after manufacture of a package like a retort food, the adhesive strength of an adhesive bond layer is maintained.

  According to the present invention, the cylindrical film of the package is formed of a multilayer film having two vinylidene chloride layer forming films and an adhesive layer that bonds the two layer forming films. There is provided a package in which peeling between the layers of the multilayer film at the sealed end is prevented, the sealing property is improved, and the pressure resistance is increased.

  Moreover, according to this invention, a cylindrical film is formed from the strip | belt-shaped film which has the adhesive bond layer which adhere | attaches two layered films of vinylidene chloride resin, and two layered films, and is content to a cylindrical film. Filled, laterally sealed at the end, and converged to produce a package, so that peeling between the layered films of the end that has been laterally sealed and sealed is prevented, sealing performance is increased, and pressure resistance is increased. A production method capable of efficiently producing a package is provided.

  Embodiments of the present invention will be described below with reference to the drawings. In each figure, the same or equivalent devices are denoted by the same reference numerals, and redundant description is omitted.

  First, a package 300 as an embodiment of the present invention will be described with reference to FIG. FIG. 1 is a diagram illustrating a package as an embodiment of the present invention, (a) is a partial cross-sectional front view illustrating a package 300, and (b) is a laminated configuration of a tubular film 310. (C) is an enlarged view of the edge part 320. FIG. The package 300 is filled with the contents C in the cylindrical film 310 and is horizontally sealed at the end portions 320 at both ends. The content may be food such as sausage or cheese, or may be pasty such as glue, and is not particularly limited. In the cylindrical film 310, a single flat belt-like film is formed in a cylindrical shape by a longitudinal seal 312 in the longitudinal direction.

  At the end 320, as shown in FIG. 1C, the tubular film 310 is focused. That is, the cylindrical film 310 is flattened and finely folded and converged in a direction crossing the flat surface. Then, a transverse seal 322 is formed across the flattened surfaces so as to stick together, and heat-sealed so as to maintain the shape converged by the heat seal portion 326. By concentrating the end 320 in this way and laterally sealing with the converging part 324, stress concentration at the end 320 can be suppressed as in the case of using a wire clip. However, since the converging part 324 is heat-sealed, the converging state is strongly maintained unlike the wire clip in which the converging part is slightly loosened, so that the stress generated in the lateral seal 322 tends to increase.

  Here, as shown in FIG. 1B, the tubular film 310 is formed of a multilayer film in which two vinylidene chloride-based resin layer-forming films 316 are bonded with an adhesive layer 318. The vinylidene chloride resin includes 60 to 97% by weight of vinylidene chloride monomer, vinyl chloride monomer, vinyl monomer partially containing vinyl chloride, methyl methacrylate monomer or butyl methacrylate monomer It is a resin containing 3 to 40% by weight of a body, and is a resin in which plasticizers, stabilizers, pigments, lubricants and the like are appropriately blended. By using the vinylidene chloride-based resin layer-forming film 316, the tubular film 310 has excellent gas barrier properties and excellent heat shrinkability and transparency, and thus is particularly suitable for food packaging applications. Further, by using two layer-forming films 316 in an overlapping manner, even if a pinhole is formed in one layer-forming film 316, the pinhole position is often different from the position of the pinhole in the second layer-forming film 316. There is no inferior gas barrier property. Here, the layer forming film 316 refers to a single layer film for forming the multilayered tubular film 310. That is, even if a pinhole is formed in each layer forming film 316, it is rare that the pinholes of the two layer forming films 316 communicate with each other, and the formation of pinholes as a multilayer film is prevented. Here, since the two layer-forming films 316 are bonded by the adhesive layer 318, the two layer-forming films 316 are not peeled off and the respective pinholes are not easily communicated. Therefore, even if the stress generated in the lateral seal 322 increases, the formation of pinholes is prevented. As is clear from the above, the package 300 has a high sealing performance and a high pressure resistance.

  The adhesive layer 318 is preferably formed of a urethane resin, an ethylene / vinyl acetate copolymer, an ethylene / methyl methacrylate copolymer, or an ethylene / methyl acrylate copolymer that is compatible with the vinylidene chloride resin. is there. Particularly preferably, it is made of a urethane resin. As the urethane resin, a two-component urethane resin or a one-component urethane resin is used. The two-component urethane resin is a resin that reacts diisocyanate, which is a bifunctional isocyanate, with a polyol mainly composed of glycol. The one-pack type urethane-based resin is a block type resin in which a highly active isocyanate is protected by a compound such as phenol or amine to be inactivated, and an isocyanate group liberated by heating is reacted with a polyol. In particular, a crosslinking reaction by allophanate bonding and a urethane crosslinking reaction by burette bonding are useful for increasing the cohesive strength of the adhesive. Urethane resins have high chemical affinity (for example, compatibility parameter values) with vinylidene chloride resins, so that they have high adhesive strength and are maintained even when heated to a high temperature of about 100 ° C. . Therefore, for example, even if the package body filled with food is heated to a high temperature in order to retort, the sealing performance of the tubular film 310 does not deteriorate. As an example of the multilayer film, the thickness of the two layer-forming films 316 is 20 μm, the thickness of the adhesive layer 318 is 5 μm, and the total thickness is 45 μm.

  Then, with reference to FIG. 2, the manufacturing method of the layer formation film of a vinylidene chloride resin, a multilayer film, and a package is demonstrated. FIG. 2 is a flowchart for explaining a production method for producing a package including a method for producing a vinylidene chloride-based resin layer-forming film and a multilayer film.

  First, with reference to FIG. 3, the process from the compound of vinylidene chloride resin to manufacturing the parisons a1 and a2 and the hollow films a3 and a4 will be described. FIG. 3 is a block diagram of a film manufacturing apparatus 100 that manufactures and stretches a parison a1 from a vinylidene chloride-based resin compound, and the parisons a1 and a2 and the hollow films a3 and a4 flow from the left to the right in the figure. Drive to. That is, the left side is the upstream side and the right side is the downstream side. Further, the vertical direction in the figure coincides with the vertical direction of the film manufacturing apparatus 100. The film manufacturing apparatus 100 includes a hopper 102 that stores raw material compounds, a melt extruder 104 that pressurizes the raw material compounds so as to heat and melt and extrude them to a die, and an annular body of melted and kneaded raw material compounds. An annular die 106 that is discharged as a parison a1, a cooling bath 110 that cools the parison a1 extruded from the annular die 106, and a heating bath 112 that heats the cooled parison a2 to adjust it to a temperature suitable for stretching. A pair of pinch rollers 122 and 142 for stretching the heated parison a2 by an inflation method, a heat fixing unit 160 for heat-fixing the stretched hollow film a4, and a roll of the heat-fixed hollow film a4 and a winder 152 wound around a5. Further, guide rollers 116 and 120 are provided for smooth running of the parisons a1 and a2 running through the film manufacturing apparatus 100, and a guide roller 148 is provided for smooth running of the hollow film a4. In this document, the parisons a1 and a2 may be referred to as a hollow film.

  The hopper 102 is a container having a shape that becomes narrower as the upper part becomes wider, and the raw material compound charged from the upper part flows through a small opening at the lower end. The upper end of the hopper 102 may be opened to feed the raw material compound from the opening, or the pipe connected to the upper part may be connected to feed the raw material compound through the pipe. If necessary, a valve for closing and adjusting the opening area may be provided. The opening at the lower end of the hopper 102 communicates with the melt extruder 104 to supply the raw material compound to the melt extruder 104. The melt extruder 104 heat-melts and kneads the raw material compound, and pressurizes the molten raw material compound with a screw. An annular die 106 having an annular flow path is disposed at the raw material compound outlet of the melt extruder 104, and the molten raw material compound is discharged from an annular lip (not shown) of the annular die 106. It becomes a parison a1 which is an annular melt.

  The cooling bath 110 is extruded from the annular die 106, and the parison a1 that is still hollow and melted is quenched with cold water stored in the cooling bath 110, and the hollow parison a1 is placed between a pair of rollers. It is a storage tank provided with a pinch roller 114 that is flattened in the radial direction by passing through. The temperature of the cold water is usually 0 to 15 ° C., but may be cooled by a refrigerant other than water. A cooler (not shown) for cooling the cold water stored may be provided, or a circulation piping system (not shown) for cooling the cold water with an external cooler (not shown) may be provided. The pair of rollers of the pinch roller 114 may be rotated by power to send out the parison a2 at a predetermined speed. Here, the predetermined speed is a speed that balances with the parison a1 that is extruded to the melt extruder 104 and discharged from an annular lip (not shown) of the annular die 106.

  The hot water bath 112 is a storage tank that warms the cooled parison a2 and stores hot water in order to prepare for a subsequent stretching step, and guide rollers 118 for guiding and running the parison a2 into the hot water bath 112. Is provided. The temperature of the hot water is 15 to 60 ° C., but it may be heated by a heating medium other than water. The cooling bath 110 and the hot water bath 112 are disposed adjacent to each other, and include a guide roller 116 for supporting the running of the parison a2.

  The pair of pinch rollers 122 and 142 are arranged apart from each other, and air is enclosed in a hollow film a3 between them to obtain a stretched hollow film a3. That is, in the pinch rollers 122 and 142, a pair of rollers arranged above and below press the flat hollow film a3 in an airtight manner. Further, the pinch rollers 122 and 142 may cause the hollow film a3 to travel at a predetermined speed. A guide roller 120 is provided above the hot water bath 112. As a driving roller 124, a guide roller 126, and a roller driving mechanism for avoiding a trouble that the parison a2 winds around the pinch roller 122 when the hollow film a3 is ruptured, the position immediately downstream of the upstream pinch roller 122 The air cylinder 128 is arranged. During normal operation, the drive roller 124 and the guide roller 126 are retracted to a position where they do not come into contact with the hollow film a3. However, when the hollow film a3 ruptures, it hangs down on the drive roller 124, the air cylinder 128 lowers the guide roller 126 to a position almost in contact with the drive roller 124, and the drive roller 124 and the guide roller 126 fail to become the hollow film a3. The parison a <b> 2 is sandwiched, and the drive roller 124 is rotated so as to be reliably sent downstream and dropped. Therefore, the trouble that the parison a2 is wound around the pinch roller 122 is avoided, the operation on the upstream side of the pinch roller 122 is continuously performed, and a quick restart can be performed.

  A pair of free rollers that gradually reduce the interval between which the hollow film a3 is sandwiched at a position immediately upstream of the pinch roller 142, so that the hollow film a3 sandwiched between the pinch roller 142 on the downstream side is crushed in a vertical direction and folded flat. A group 132 is arranged. The free roller group 132 has a plurality of rollers along the hollow film a3, and the plurality of rollers gradually flatten the hollow film a3 sandwiched between the pinch rollers 142. The spacing between the free roller groups 132 is adjusted by an air cylinder 136 as a position driving device.

  A bubble guide 130 is disposed approximately at the center between the pair of pinch rollers 122 and 142. The bubble guide 130 is configured by a frame that is slightly larger than the hollow film a3 swelled with air, and suppresses the shake of the hollow film a3. Further, a burst detector 134 is disposed between the rollers of the free roller group 132. By being arranged between the rollers of the free roller group 132, the burst detector 134 is in contact with the hollow film a3 during normal operation and can easily detect the burst of the hollow film a3. When the burst detector 134 detects a burst as a sudden change in the pressing force, the air cylinder 128 and the driving roller 124 are activated, for example, via a control device (not shown), and the downstream side of the hollow film a3 is sandwiched. Send out and drop.

  A guide roller 146 is disposed in contact with the upper roller of the downstream pinch roller 142, and the flat hollow film a <b> 4 runs along the pinch roller 142. By causing the hollow film a4 to run along the roller of the pinch roller 142 by the guide roller 146, the airtightness of the hollow film a3 at the pinch roller 142 is improved. A guide roller 148 is provided above the pinch roller 142, and the hollow film a <b> 4 is run horizontally, and the winder 152 takes up the hollow film a <b> 4. A pinch roller 150 is provided between the guide roller 148 and the winder 152. The peripheral speed of the pinch roller 150 is 0.90 to 0.97 times, preferably 0.92 to 0.96 times the peripheral speed of the pinch roller 142 (the speed at which the hollow film a4 travels). The winding form of the hollow film a4 wound on the roll by the machine 152 is arranged. When the peripheral speed of the pinch roller 150 is less than 0.90 times the peripheral speed of the pinch roller 142, wrinkles enter the hollow film a4 wound around the roll a5, and when it exceeds 0.97 times, the longitudinal direction of the flat film This causes a so-called ear-earing phenomenon at the edge of the wire, resulting in poor winding.

  In order to manufacture the film roll a5 of the hollow film wound around the roll from the raw material compound by the film manufacturing apparatus 100, first, the raw material compound is charged into the hopper 102. The raw material compound is usually 60 to 97% by weight of vinylidene chloride monomer, vinyl chloride monomer, vinyl monomer partially containing vinyl chloride, methyl methacrylate monomer or butyl methacrylate monomer 3 A vinylidene chloride resin composed of 40% by weight is mixed with a plasticizer, a stabilizer, and, if necessary, a pigment, a lubricant, etc., as appropriate.

  As a plasticizer, dibutyl sebacate, dioctyl adipate, tributyl acetylcitrate, tributyl citrate or a mixture thereof is used. As the stabilizer, epoxidized vegetable oil or the like is preferably used. The composition of the raw material compound is usually 100 parts by weight of a vinylidene chloride resin resin, 0.1 to 10 parts by weight of a plasticizer, and 0.1 to 5 parts by weight of a stabilizer.

  The raw material compound charged into the hopper 102 is supplied to the melt extruder 104 from the opening at the lower end, and is heated and melted by the melt extruder 104. The melted raw material compound is extruded from the melt extruder 104, flows down through the annular die 106 as a parison a1 as a molten tubular body into the cooling bath 110, is cooled with cold water, and is melted into a film-like parison a1. (Step S10). The film-like parison a1 is folded flat by the pinch roller 114 in the cooling bath 110, and the parison a1 travels at a predetermined speed by rotating the pinch roller 114 at a predetermined rotation speed. . A release agent L is injected into the upper side of the parison a1 and sandwiched between the pinch rollers 114, and is applied to the inner surface of the parison a1. The release agent L is held on the upper side sandwiched between the pinch rollers 114 when the parison a1 is pressure-bonded by the pinch rollers 114. The mold release agent L is injected from an upper tank (not shown) through a pipe penetrating up and down the annular die 106 inside the parison a1 between the pinch rollers 114, thereby releasing the mold release agent. L is easily and continuously applied. By applying the release agent L, the adhesion between the parisons a1 is prevented, and the inner surface of the parison a2 is easily separated at a later stage.

  The parison a2 folded by the pinch roller 114 travels upward from the cooling bath 110, changes its traveling direction downward by the guide roller 116, and is immersed in the warm water in the heating bath 112. The parison a2 heated by the hot water in the warming bus 112 changes direction by the guide roller 118, travels above the warming bus 112, travels almost horizontally by changing the direction by the guide roller 120, and the pinch roller 122.

  The parison a2 is forcibly expanded by compressed air enclosed inside at the start of manufacture and confined inside due to the action of the pinch roller 122 and the pinch roller 142, and the diameter of the tubular body is usually 2-5. It becomes the hollow film a3 which is the bubble expanded twice. That is, the hollow film a3 is stretched by an inflation method (step S20). Therefore, the pinch roller 122 and the pinch roller 142 press the upstream parison a2 and the hollow film a4 so that the air inside does not leak. When the air inside the hollow film a3 slightly leaks and the internal pressure drops, the pinch roller 142, that is, the column 140 that supports the pinch roller 142 moves so as to approach the pinch roller 122 side. Alternatively, the internal pressure is maintained at a predetermined pressure by moving the column 138 supporting the pinch roller 122 so as to approach the column 140 side. It is preferable that a pinion (not shown) is provided at the lower part of the columns 138 and 140 so that the column 138 and 140 can move in association with a rack (not shown) installed on the floor.

  The hollow film a <b> 3 is guided by the bubble guide 130 in the middle between the pinch roller 122 and the pinch roller 142 and can be prevented from shaking. The hollow film a3 is gradually folded flat by the free roller group 132 and reaches the pinch roller 142 (step S30).

  The direction of the hollow film a4 folded by the pinch roller 142 is changed by the guide roller 146 and the guide roller 148, and is guided to the heat fixing unit 160 through the pinch roller 150. The stretched vinylidene chloride resin has a higher crystallinity thereafter, and the dimensions of the hollow film a4 change. For example, a shrinkage of 10% or less as a dimension occurs in one month at room temperature. Therefore, the hollow film a4 is heated at a predetermined temperature to increase the crystallinity (step S40). This is called heat setting. Typically, heat setting is performed by heating at a temperature of 30 ° C to 80 ° C, preferably 30 ° C to 60 ° C. If the temperature exceeds 80 ° C., the traveling of the hollow film a4 may not be stable and may cause wrinkles. The heating method is performed by, for example, a heat roll such as an induction heating roll or a resistance heating roll, or radiation heating. As shown in FIG. 3, a heat fixing unit 160 including an induction heating roll (not shown) or a radiator (not shown) is arranged on the upstream side of the winder 152, and heat-fixed to the stretched hollow film a4. It is good. For example, if the degree of crystallinity is 20% to 40%, more preferably 25 to 40%, and particularly preferably 25 to 35% by performing heat setting, the film is not deformed thereafter, which is preferable. The heat setting may be performed by heating the hollow film a4 around the roll a5 and then heating and accelerating, or may be performed by maintaining it at room temperature for a long time.

  The hollow film a4 folded and heat-fixed by the pinch roller 142 is wound around the roll a5 by the winder 152 (step S50).

    Next, with reference also to FIG. 4, a method for producing the layer-forming films b2 and b3 from the film roll a5 wound with the stretched hollow film a4 will be described. FIG. 4 is a block diagram for explaining a method of producing the layer forming films b2 and b3 from the film roll a5 wound with the stretched hollow film a4. The folded hollow film b1 is pulled out from the film roll a5, and the side edges b6 and b7 are cut off by two parallel cutters 202. The hollow film b1 becomes two layer-forming films b2 and b3 having a predetermined width by cutting off the side edges b6 and b7 (step S60). Since the folded hollow film b1 is formed to have a substantially constant width, the side edge portions b6 and b7 are cut out with a predetermined width from the width, thereby forming a layer-forming film b2 having a constant width. , B3. The two layer forming films b2 and b3 are respectively wound on the rolls b4 and b5 (step S70). If necessary, the step S70 wound on the rolls b4 and b5 can be omitted, and the connection from the step S60 to the subsequent steps S80 and S90 can be performed in-line.

  Next, with reference to FIG. 5, a process of bonding the two layer-forming films b2 and b3 will be described. FIG. 5 is a block diagram for explaining a process of applying the adhesive P to the two layer-forming films b2 and b3 and bonding them to form a multilayer belt-like film F. The layer forming film b2 is pulled out from one roll b4 of the rolls b4 and b5 around which the two layer forming films b2 and b3 are wound. After the traveling direction of the layer forming film b2 is changed by the guide roller 218, the adhesive P is applied by the scooping / applying roller 212 on the adhesive bat 210 that stores the liquid adhesive P.

  The scraping / applying roller 212 is immersed in the adhesive P stored in the adhesive bat 210 at the lower portion thereof and rotates to adhere the adhesive P to the entire surface (step S80). Due to the viscosity of the adhesive P, the adhesive P adhering to the surface of the scooping up / applying roller 212 may be thick or non-uniformly attached. Therefore, a scraping reverse roller 214 is disposed adjacent to the scraping / coating roller 212. Scrape up the surface of the reverse roller 214 by scraping the surface of the reverse roller 214 with the adhesive P of the adhesive bat 210 and rotating upward. The adhesive P that is thick and unevenly adhered to the surface of the application roller 212 is thinly spread evenly, and the excess adhesive P is scraped off so as to return to the adhesive bat 210. Therefore, the adhesive P is uniformly applied to one side of the layer forming film b2. A pressing roller 216 facing the scooping / applying roller 212 is disposed so that the adhesive P is surely applied to the layer forming film b2, and the scoring / applying roller 212 and the pressing roller 216 form the layer forming film b2. Pinch. Alternatively, the adhesive P that adheres unevenly may be scraped off using a doctor knife (not shown) instead of the scraping reverse roller 214.

  The layer forming film bp on which the adhesive P is applied to the uniform thickness by the scooping / applying roller 212 is supported by the guide roller 220 and the surface to which the adhesive P is applied is directed vertically upward. The layer forming film bp with the surface coated with the adhesive P directed vertically upward is guided to the drying furnace 230.

  The drying furnace 230 is a furnace for drying the adhesive P on the layer forming film bp, and introduces high-temperature dry air into the furnace to evaporate the solvent in the adhesive P. The roller group 232 is disposed in the furnace so that the layer forming film bp travels in the drying furnace 230 while being curved horizontally or upwardly, and supports the traveling layer forming film bp from below. The drying furnace 230 introduces, for example, dry air heated to 50 ° C. to 70 ° C. from a duct (not shown), guides the air containing the evaporated solvent from a discharge port (not shown) to a solvent collecting device (not shown), and sanitary Process and discharge so that there is no problem. If the temperature of the dry air exceeds 70 ° C., the traveling of the film b2 may not be stable and may cause wrinkles. Further, when the temperature of the dry air is less than 50 ° C., the solvent may not be sufficiently evaporated, so that the adhesive strength may be insufficient.

  The layer forming film bp obtained by drying the adhesive P in the drying furnace 230 is supported by the guide roller 240 and guided to the pressure roller 250. Further, the layer forming film b3 is guided to the pressure roller 250 through the guide rollers 260 and 262 from the other one of the two rollers b4 and b5. The layer forming film b3 is pressure bonded to the adhesive P on the layer forming film bp by the pressure roller 250, and the layer forming film bp coated with the adhesive P and the layer forming film b3 are bonded (step S90). That is, the multilayer film F of the layer forming film b2, the adhesive P, and the layer forming film b3 is manufactured. The multilayer film F has an elongated strip shape and becomes a multilayer strip film F. The solvent is evaporated in the drying furnace 230 and the layer-forming film bp and the layer-forming film b3 are pressure-bonded. If necessary, the wound roll 21 is allowed to stand at a temperature of 30 ° C. to 45 ° C. within one week, The process which raises the adhesive force of the layer formation film bp and the layer formation film bp more is performed.

  The belt-like film F is supported by the guide rollers 270 and 272 and wound around the roll 21 (step S100). When the roll 21 is wound up, the roll 21 is wound in the direction of the roll 21 by the arm 276 provided with a roller 274 at the tip and rotatably supported at the other end. . The belt-like film F wound around the roll 21 is supplied as a raw fabric to a subsequent process. The layer forming films b2 and b3 correspond to the layer forming film 316 shown in FIG. 1, and the adhesive P corresponds to the adhesive layer 318 shown in FIG.

  Next, with reference to FIG. 6, the manufacturing method of the package 300 from the strip | belt-shaped film F is demonstrated. 6A and 6B are diagrams illustrating a manufacturing apparatus that manufactures the package 300 from the belt-like film F. FIG. 6A is a configuration diagram illustrating the overall configuration of the package manufacturing apparatus 1 that manufactures the package, and FIG. FIG. 5 is a partial perspective view illustrating the configuration of a heat seal / cut device 70. 6A corresponds to the actual vertical direction, and a tubular film F1 described later travels so as to flow from top to bottom in the drawing. That is, the upper side is the upstream side in the traveling direction of the tubular film F1 in the filling and packaging operation, and the lower side is the downstream side in the traveling direction. The belt-like film F wound in a roll shape is rotatably supported as a roll 21. The belt-like film F drawn out from the roll 21 travels while being guided by the guide rollers 22 </ b> A and 22 </ b> B and is guided to the forming plate 11. The roll 21 and guide rollers 22A and 22B constitute an original fabric supply device 20.

  The forming plate 11 has a cylindrical shape that opens up and down. In addition, there is a circumferential gap extending in the longitudinal direction at one place in the circumferential direction. The upper edge of the forming plate 11 is curved and inclined, and the belt-like film F is formed into a continuous cylindrical film F1 having an overlapping portion at the side edge by being guided along the inner surface thereof. A guide cylinder 12 is suspended below the forming plate 11 on the downstream side, and the tubular film F1 is guided to travel downstream while maintaining its tubular shape.

  The overlapping portion of the tubular film F1 guided by the guide tube 12 is welded while being pressed by the vertical sealing device 13 and is vertically sealed. As the welding means by the vertical sealing device 13, an ultrasonic heating seal is suitable, but besides this, a resistance heating seal, a high-frequency dielectric heating seal, a laser heating seal, a molten resin droplet spraying seal, and other various heating and welding seals Means can be used. In addition, the vertical seal may be a so-called jointed sticker or an envelope sticker.

  In the upper part of the package manufacturing apparatus 1, a filling apparatus 30 including a pump 31 and a nozzle 32 for filling the vertically sealed cylindrical film F1 with the contents C is provided. The nozzle 32 is connected to a pump 31 installed above the forming plate 11, and the tip is introduced into the guide tube 12. The tip of the nozzle 32 opens on the downstream side of the vertical sealing device 13. The pump 31 may be installed not in the upper part of the forming plate 11 but in another position where the contents are easily replenished, and connected to the nozzle 32 by piping. In particular, when filling a relatively heavy content such as kneaded food, the kneaded food stored in a container installed on the ground is pumped to the position of the nozzle 32 by a pump and supplied. Is good.

  A feed roller 14 that is a feed device is provided on the downstream side of the guide tube 12 and the nozzle 32. The pair of cylindrical feed rollers 14 continuously conveys the tubular film 15a filled with the contents C into the vertically sealed tubular film F1 in a narrow and downward direction.

  An ironing device 40 is provided on the downstream side of the feed roller 14. The ironing roller 41 of the ironing device 40 has a cylindrical outer surface extending in a direction perpendicular to the paper surface in FIG. 6, and the length in the perpendicular direction is at least longer than the folding width, and is supported by the arm body 42. The “folding width” means the width when the tubular film 15a is flattened, in other words, the half length of the circumferential length of the tubular film 15a. The arm body 42 can swing around its one end 42a, and a lateral member 43 is connected to the middle part via a pin or the like. When the pair of lateral members 43 moves in the proximity direction, the cylindrical film 15 a is narrowed by the pair of squeezing rollers 41. When the horizontal member 43 moves backward in the separation direction, the squeezing roller 41 does not narrow the cylindrical film 15a. Thus, the absent portion 15b of the contents C is formed in the traveling cylindrical film 15a by a predetermined distance in the traveling direction. The ironing device 40 is not limited to a roller as long as the absent portion 15b of the contents C can be formed flat on the tubular film 15a, and for example, the tubular film 15a is crushed from both sides with a flat member, and the contents are distributed up and down. It may be something like this. Such crushing is also included in the concept of “squeezing” here.

  A first ultrasonic heating sealing device 61 is installed on the downstream side of the ironing device 40. In the first ultrasonic heat sealing device 61, a first horn 62 and a first anvil 63 are arranged to face each other with the tubular film 15a or the absent portion 15b interposed therebetween. The first horn 62 has two crimping surfaces 62a that are long in the horizontal direction and are vertically separated by a predetermined distance. The predetermined interval is shorter than the length of the absent portion 15b, and is a length that can be converged within the interval, can be sealed as described later, and cut into a package. The crimping surface 62a is longer than the width of the absent portion 15b in the horizontal direction and has a length that crosses the absent portion 15b. The first anvil 63 has a flat surface 63a that faces the pressure-bonding surface 62a of the first horn 62, and sandwiches the absent portion 15b with the pressure-bonding surface 62a. The horn 62 and the anvil 63 reciprocate close to each other and then away. When the first horn 62 and the first anvil 63 come close to each other, the absent portion 15b is narrowed and the film is subjected to ultrasonic heat sealing to perform horizontal sealing. Note that a resistance heating seal, a high-frequency dielectric heating sealing device, a laser heating sealing device, and other various heating sealing devices can be used instead of the first ultrasonic heating sealing device 61.

  A focusing device 71 having two sets of focusing plates 72 and 73 on the downstream side by a predetermined interval where the absent portion 15b of the first ultrasonic heating and sealing device 61 is formed, that is, the same length as one package 300. Is installed. In the focusing device 71, the pair of focusing plates 72 and 73 sandwich the absent portion 15 b in the width direction of the flat absent portion 15 b. The opposing focusing plates 72 and 73 reciprocate close to each other and then away from each other. This reciprocation is performed in a direction orthogonal to the reciprocation of the ironing device 40 or the first ultrasonic heating and sealing device 61. That is, in FIG. 6A, the focusing plates 72 and 73 are also drawn so as to reciprocate on the paper surface, but actually they reciprocate in a direction perpendicular to the paper surface. As shown in FIG. 6B, the converging plates 72 and 73 are formed with converging grooves having a shape recessed at the opposing edge on the absent portion 15b side. This concave shape is V-shaped, U-shaped or the like. When the opposing focusing plates 72 and 73 are close to each other, the left and right focusing plates 72 and 73 overlap to form one small space between the groove bottoms of the respective V-shaped grooves. If a U-shaped notch is formed in the groove bottom of the V-shaped groove, a circular space is formed between the U-shaped bottoms when the focusing plates 72 and 73 are close to each other, which is preferable.

  A second ultrasonic heating sealing device 76 is provided between the two sets of focusing plates 72 and 73 of the focusing device 71. In the second ultrasonic heating and sealing device 76, the second horn 77 and the second anvil 78 are disposed to face each other with the cylindrical film 15a or the converged absent portion 15b interposed therebetween. The second horn 77 has two pressure-bonding surfaces 77a that are longer than the width of the absent portion 15b focused by the focusing device 71 (folded width when focused) at a predetermined interval in the horizontal direction. This predetermined interval is shorter than the predetermined interval at which the two crimping surfaces 62a of the first horn 62 are separated from each other, but is a length that allows the package to be cut therebetween. The second anvil 78 has a flat surface 78a including a position facing the crimping surface 77a of the second horn 77, and the focused portion 15b is sandwiched between the second anvil 78 and the crimping surface 77a to maintain the focused state. Thus, the absent portion 15b is heat-sealed. The second horn 77 and the second anvil 78 sandwich the absent portion 15b slightly behind the focusing plates 72 and 73, and heat-seal the absent portion 15b focused by the focusing device 71. Similarly to the focusing device 71, the second ultrasonic heat sealing device 76 also reciprocates in a direction perpendicular to the paper surface of FIG.

  A cutter 81 serving as a cutting device is provided at a position that divides the second anvil 78 vertically into two. The cutter 81 is plate-shaped, and a sharp blade portion is provided on the side where the absent portion 15b to be cut exists. The cutter 81 also reciprocates in the direction perpendicular to the paper surface of FIG. 6A in the same manner as the focusing plates 72 and 73, the second horn 77, and the second anvil 78, and the focused absent portion 15b is the second. The second horn 77 and the second anvil 78 are heated and sealed with the absent portion 15b interposed therebetween so that the absent portion 15b is cut after being heat-sealed by the ultrasonic heat-sealing device 76. Disconnect. The focusing device 71, the second ultrasonic heating sealing device 76, and the cutter 81 are preferably driven by a common driving device (not shown) because the configuration is simplified. Therefore, the focusing device 71, the second ultrasonic heating sealing device 76, and the cutter 81 are preferably configured as a single focusing / heating sealing / cutting device 70.

  Further, the focusing device 71, the second ultrasonic heat sealing device 76, and the cutter 81 focus the absent portion 15b while moving downward at the same speed as the cylindrical film 15a is sent downward, and heat seal it. After cutting, it is preferable to perform a so-called “worship motion (box motion)” in which the absent portion 15b is opened and returned to the upper position. Therefore, when the focusing device 71, the second ultrasonic heating sealing device 76, and the cutter 81 are installed on a common gantry (not shown), the configuration is simplified. The first ultrasonic heat sealing device 61 may be moved in the same manner.

  Then, the method to manufacture the package 300 using the package manufacturing apparatus 1 is demonstrated. The belt-like film F is pulled out from the roll 21 at a predetermined speed, is applied with a predetermined tension by the guide rollers 22 </ b> A and 22 </ b> B, is traveled, and reaches the forming plate 11.

  The belt-like film F that has reached the forming plate 11 is formed in a cylindrical shape having overlapping portions at the side edges, and the overlapping portions are heat-sealed by the vertical sealing device 13. In this way, the vertically sealed tubular film F1 is formed (step S110). The cylindrical film F1 is filled with the contents C from the pump 31 through the nozzle 32 (step S120). The cylindrical film 15 a filled with the contents C is conveyed downstream by the feed roller 14. The pair of feed rollers 14 conveys the cylindrical film 15a with a small pressure so as to locally crush the cylindrical film 15a, but the crushed cylindrical film 15a passes through the position of the feed roller 14 due to the internal pressure of the contents C. Return to the original cylindrical shape.

  The cylindrical film 15a is intermittently compressed over a predetermined length by the pair of squeezing rollers 41, and the absent portion 15b without the contents C is formed at a predetermined interval (step S130). The first ultrasonic heating and sealing device 61 linearly seals the absent portion 15b at the first two positions X1 and X2 corresponding to the two crimping surfaces 62a of the first horn 62 (step S140). ). This horizontal seal is also called a primary seal. In addition, it is preferable to overlap the absent film 15b with the reinforcing film that covers the absent portion 15b when performing the horizontal seal and perform the horizontal seal together with the absent portion 15b, since the strength of the sealed converging portion is further improved. The material of the reinforcing film is generally the same as the material of the belt-like film F, but other materials may be used as long as the material is easily heat-sealed with the belt-like film F. Further, it is preferable that the vertically sealed overlapped portion is flattened by the ironing roller 41 so that the overlapped portion fits on one side, and the overlapped portion is covered with a reinforcing seal. Thus, by having a reinforcement film, the place which is heat-sealed and tends to become a weak part is reinforced.

  The focusing device 71 focuses the absent portion 15b between the first two positions X1 and X2 where the lateral seal is made. By forming a horizontal seal and focusing, the focused portion is finely packed. When the absent portion 15b is focused, only the flattened cylindrical film F exists up to the position where the horizontal seal is made, so that it is easily focused and the portion filled with the contents C on the opposite side across the horizontal seal is focused. To maintain the original shape (cylindrical shape). Therefore, as shown in FIG. 1 (c), it is focused to the position where the horizontal seal 322 is placed, and is horizontally sealed and focused, that is, it is finely packed, at the portion filled with the contents C across the horizontal seal 322. The original shape gradually returns to the original shape. As such, the laterally sealed portion 322 is included within the scope of the converged portion 324. In order to maintain the focused state, the second ultrasonic heating and sealing device 76 has the absence portion 15b focused at the second two positions Y1 and Y2 corresponding to the two crimping surfaces 77a of the second horn 77. Is heat-sealed linearly (step S150). This heat seal is also called a secondary seal. Since the package 300 is basically sealed by a lateral seal made by the first ultrasonic heat sealing device 61, even if it is not sealed (sealed) by the heat sealing by the second ultrasonic heat sealing device 76. Good. And it cut | disconnects with the cutter 81 between the 2nd two positions Y1 and Y2 heat-sealed with the 2nd ultrasonic heat-sealing apparatus 76, and it becomes the one package body 300 (step S160). The package 300 is supplied to subsequent processing.

  Thus, by manufacturing the package 300 using the package manufacturing apparatus 1, the package 300 can be manufactured continuously, that is, in large quantities and quickly. Heretofore, the first ultrasonic heating sealing device 61 has been described as performing linear horizontal sealing at the first two positions X1 and X2 having a predetermined interval in the absent portion 15b. 1 may be laterally sealed between the two positions X1 and X2. Further, the second ultrasonic heat sealing device 76 has been described as performing linear heat sealing at the second two positions Y1 and Y2 having a predetermined interval. However, the second two positions Y1 and Y2 are described. You may heat-seal in a strip shape.

  In the above description, the stretched and heat-set hollow film a4 is wound around the roll a5, and the hollow film b1 drawn from the roll a5 is used to cut out the side edges b6 and b7 to form two layers. The formed films b2 and b3 are manufactured, but the side edges b6 and b7 of the hollow film a4 (b1) are continuously cut without winding the stretched and heat-set hollow film a4 around the roll a5. Then, the two layer forming films b2 and b3 may be manufactured. Further, a multilayer film F is manufactured by winding two layer-forming films b2 and b3 around rolls b4 and b5, drawing the layer-forming films b2 and b3 from the rolls b4 and b5, and applying and bonding an adhesive P. However, the multilayer film F may be manufactured by continuously applying and bonding the adhesive P as it is without winding the two layer forming films b2 and b3 around the rolls b4 and b5.

  As described above, a layered film of vinylidene chloride resin is manufactured, a multilayer film is formed by adhering two layered films with an adhesive layer, and the edges are converged and converged using the multilayer film. According to the method for manufacturing a package in which a lateral seal is made across the portion, the two layer-forming films are not peeled off, the pinholes are difficult to communicate with each other, and the formation of pinholes is prevented. A package with high sealing performance and high pressure resistance can be produced efficiently.

  In order to confirm the effect of the present invention, the pinhole occurrence rate of a package manufactured using a multilayer film in which two layer-formed films were bonded with an adhesive as described above was measured. Using a multilayer film with a total thickness of 45μm, which is made of two layers of vinylidene chloride-based resin with a thickness of 20μm bonded with an urethane resin adhesive. The content is 20mm in diameter and 150mm in length. A package was produced. A positive voltage electrode plate having a diameter of 13 mm was brought into contact with the outside of the package, a negative voltage electrode needle was inserted into the package, and a voltage of 4000 V was applied. As a result, it was determined that a pinhole occurred when a current of 80 μA or more flowed.

  For comparison, a package was produced in the same manner by simply stacking two 20 μm-thick vinylidene chloride-based layer-formed films without bonding with an adhesive, and the same measurement was performed. Here, generally, if the pinhole occurrence rate is less than 0.5%, it is considered as a non-defective product (low defect rate), and if it is 0.5% or more, measures such as changing the sealing conditions are taken. Take.

  As a result of producing 200 packaging bodies and measuring the presence or absence of pinholes, the packaging bodies produced using a multilayer film in which two layer-forming films according to the present invention are bonded with an urethane resin adhesive Then, the pinhole generation rate was less than 0.5%, and the pinhole generation rate exceeded 0.5% in a package manufactured using a film in which only two layer-forming films were stacked. Therefore, the effect of the present invention was confirmed.

It is a figure explaining the package as embodiment of this invention, (a) is a partial cross section front view explaining the package 300, (b) is an expanded sectional view which shows the structure of the cylindrical film 310. (C) is an enlarged view of the end 320. It is a flowchart explaining the manufacturing method to manufacture which manufactures a package body including the manufacturing method of the layer formation film of a vinylidene chloride resin, and a multilayer film. It is a block diagram of the film manufacturing apparatus which manufactures a parison from the compound of vinylidene chloride resin, and extends | stretches it. It is a block diagram explaining the method to manufacture a layer formation film from the film roll wound by the stretched hollow film. It is a block diagram explaining the process of apply | coating an adhesive agent to two layer formation films, adhere | attaching, and making it a multilayer strip | belt-shaped film. It is a figure explaining the manufacturing apparatus which manufactures a package body from a strip | belt-shaped film, (a) is a block diagram which shows the whole structure of the package body manufacturing apparatus which manufactures a package body, (b) is a structure of a focusing / heating seal / cutting device It is a fragmentary perspective view explaining these.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Package manufacturing apparatus 11 Forming plate 12 Guide cylinder 13 Vertical seal apparatus 14 Feed roller 15a Cylindrical film 15b with which the content was filled 20 Absent part 20 Raw material supply apparatus 21 Roll 22A, 22B Guide roller 30 Filling apparatus 31 Pump 32 Nozzle 40 squeezing device 41 squeezing roller 42 arm body 43 transverse member 61 first ultrasonic heating sealing device 62 first horn 62a pressure bonding surface 63 first anvil 63a plane 70 focusing / heating sealing / cutting device 71 focusing devices 72, 73 Focusing plate 76 Second ultrasonic heating sealing device 77 Second horn 77a Crimp surface 78 Second anvil 78a Plane 81 Cutter 100 Film manufacturing device 102 Hopper 104 Melting extruder 106 Ring die 110 Cooling bath 112 Heating bath 114 122, 142, 150 Pinch roller 1 6, 118, 120, 146, 148 Guide roller 124 Drive roller 126 Guide roller 128 Air cylinder 130 Bubble guide 132 Free roller group 134 Rupture detector 136 Air cylinder 138, 140 Column 152 Winder 160 Heat fixing unit 202 Cutter 210 Adhesion Agent vat 212 Scooping up and applying roller 214 Scraping reverse roller 216 Pressing roller 218, 220 Guide roller 230 Drying furnace 232 Roller group 240 Guide roller 250 Pressure roller 260, 262 Guide roller 270, 272 Guide roller 274 Roller 276 Arm 300 Package 310 Cylindrical film 312 Vertical seal 316 Layer forming film 318 Adhesive layer 320 End 322 Horizontal seal (transverse seal)
324 Focusing part (focused part)
326 Heat seal part a1, a2 Parison (hollow film)
a3, a4 hollow film a5 film roll b1 folded hollow film b2, b3 layer forming film b4, b5 layer forming film roll b6, b7 side edge bp layer forming film C coated with adhesive C contents F Strip film F1 Cylindrical film L Release agent P Adhesives X1 and X2 First two positions Y1 and Y2 Second two positions

Claims (6)

A tubular film that is end-focused and is transversely sealed across the focused portion;
A content filled and sealed in the tubular film;
The cylindrical film is formed of a multilayer film having two vinylidene chloride-based resin layer-forming films and an adhesive layer that bonds the two layer-forming films;
Packaging body. The adhesive layer is formed of a urethane-based resin;
The package according to claim 1. A method of manufacturing a package body in which ends of a cylindrical film filled with contents are converged and a transverse seal is formed across the converged portion;
A vertical film is formed by vertically sealing two vinylidene chloride-based resin layer-forming films and a longitudinal side edge of a belt-like film having an adhesive layer for bonding the two layer-forming films to form a cylindrical film. A sealing step;
A filling step of filling the cylindrical film with contents;
An ironing step of flatly forming a non-existing portion of the content at predetermined intervals in the longitudinal direction of the tubular film with respect to the tubular film filled with the content;
A transverse seal that linearly seals the absent portion in a transverse direction and linearly at the first two positions spaced in the longitudinal direction, or a band-like transverse seal between the first two positions. Process and;
Between the first two positions, it converges in the width direction of the transverse seal and is linear at a second two positions having a distance in the longitudinal direction at the converging portion or at the second two positions. A bundling process in which the gap is heated and sealed in a band shape;
A cutting step of cutting the tubular film between the second two positions;
A method for manufacturing a package. The strip film is
Melting and extruding a compound comprising a vinylidene chloride resin from an annular die to form a long continuous hollow film;
Stretching the hollow film by an inflation method;
Crushing the stretched hollow film in the radial direction and folding and flattening;
A step of producing two layer-forming films by cutting out two side edges in the longitudinal direction of the flattened hollow film with a predetermined width;
Forming the adhesive layer on one surface of one of the two layer-forming films;
A step of stacking and pressing another layer-forming film of the two layer-forming films on the formed adhesive layer;
The manufacturing method of the package of Claim 3. A step of heat-setting the stretched hollow film;
The manufacturing method of the package body of Claim 4. The adhesive layer is formed of a urethane-based resin;
The manufacturing method of the package of any one of Claim 3 thru | or 5.

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