JP2007126216A - Sealing bag with folding part and manufacturing method for it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To manufacture a sealing bag with two or more folding parts, which can be applied to an aseptic filling without providing a process to sterilize the inside of the bag, from an inflation film efficiently. <P>SOLUTION: The sealing bag having a folding part on the bottom and the top or both sides of the side wall is formed by manufacturing the inflation film 16 using sterile air and laminating or sealing by heat another film member on at least a part of the outer surface of the film and forming the folding parts by pushing inward the periphery of the inflation film with a pushing tool 10 at two places, while sterile air is filled into the tubular inflation film to inflate the film. The inflation film which consists of a series of the sealing bags is wound or cut off each sealing bag maintaining the sealing state to provide to an aseptic filling factory. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a sealed bag having a folded portion obtained by manufacturing the blown film in a sealed state from an inflation film, and a method for manufacturing the same. The present invention relates to a sealed bag having a folded portion and a manufacturing method thereof.

  Conventionally, it is well known to manufacture a flat bag directly from an inflation film, and a flat bag for aseptic filling is manufactured by partitioning an inflation film formed using aseptic air by heat sealing. It is also known to be applicable to aseptic filling without being provided. In addition, it has also been proposed to directly manufacture a self-supporting bag having a folded portion at the bottom from an inflation film (Patent Document 1). However, what has been proposed heretofore has a fold portion only at the bottom, and it is known that a bag having two or more fold portions in one bag is directly manufactured from an inflation film in a cylindrical shape. In addition, a bag having two or more folded portions is manufactured by heat-sealing a sheet-like film.

Therefore, in the conventional method for manufacturing a bag having a plurality of folded portions, the film surface that becomes the inside of the bag is exposed to the outside air during the film manufacturing process and the bag making, and the inside of the bag is maintained in a sterile state without being sterilized. The sealed bag could not be provided to the filling factory. Therefore, a self-supporting bag or the like that is conventionally used for aseptic filling of food contents such as beverages or medical contents such as infusions, is irradiated with electron beams, γ rays, or ultraviolet rays after bag making, Alternatively, the outer surface and the inner surface are sterilized with a chemical substance such as ethylene oxide. However, sterilization with electron beams and γ rays can be sufficiently sterilized to the inner surface side, but there are problems such as strength reduction due to resin deterioration and generation of off-flavor, and a problem that requires an expensive sterilization device There is also. Further, sterilization with ultraviolet rays has a problem that the material is limited from the viewpoint of permeability. Furthermore, the sterilization method using a chemical substance such as ethylene oxide has a problem that a residue tends to be generated in the container. In addition, in the case of medical bags such as infusion solutions, it is necessary to prevent not only sterility but also contamination by pyrogenic substances such as endoxin, which is extremely difficult to achieve with conventional manufacturing methods. It was difficult. In addition, in the case of an inflation film, multicolor high-quality printing is difficult, and there is a problem that it is not compatible with various designs of bags.
JP 09-174719 A

  The present invention was devised in view of the above circumstances, and can be easily manufactured from a tubular inflation film, and has a plurality of folded portions that can reduce manufacturing costs compared to the conventional case. And a manufacturing method thereof, and in particular, a manufacturing method of a sealed bag having a plurality of folded portions that can overcome the difficulty of high-grade multicolor printing, and aseptic filling without providing a sterilization step inside the bag A sealed bag having a plurality of foldable parts with excellent sterility, and a sealed bag having a plurality of folds formed from an inflation film formed using aseptic air and having excellent design characteristics. A second object is to provide a method for manufacturing a sealed bag that can be manufactured automatically.

The hermetic bag having a folded portion of the present invention that solves the above problems is formed of at least an inner layer of a tubular inflation film, the folded portion is formed with the inflation film remaining in an endless state in the circumferential direction, and the inside of the bag is A sealed bag having a folded portion in which a heat seal portion is formed in a sealed state, wherein the folded portion is a pair of folded portions formed on both sides or bottom and top of the trunk portion of the sealed bag. It is characterized by this.
The fold portion is formed at the bottom and the top portion, and heat sealed with the unsealed portion remaining in the fold portion at the top portion, and a plug body is attached to the unsealed portion, so that the plug body is attached to the fold portion at the top portion. It is possible to obtain a self-supporting bag with a plug body having Further, by forming the folded portion on both sides of the body portion, a sealed gusset bag in which gussets are formed on both sides of the body portion can be obtained directly from the inflation film.

  Then, by adopting aseptic air as a means for inflating the inflation film in the production process, a sealed bag can be obtained which can be sealed while the inside is kept aseptic and can be applied for aseptic filling without sterilizing the inside. Further, it is desirable to laminate a printed outer layer film or an outer layer film excellent in gas barrier properties on the outer peripheral portion of the inflation film.

  The method for producing a sealed bag of the present invention, which can directly produce a sealed bag having a folded portion from an inflation film, is a method for producing a bag having a folded portion from an inflation film in a sealed state, and produces the inflation film. The film manufacturing process, the process of laminating or heat-sealing another film member on at least a part of the outer surface of the film, the inner surface of the inflation film being inflated by adding air to the inside of the tubular inflation film It is characterized by comprising a folding step for forming a folded portion by pushing in, a heat sealing step for heat sealing a predetermined portion to form a sealed bag portion, and a sealed bag storage step for storing the sealed bag formed on the inflation film. To do. The sealed bag storage step winds or folds the inflation film formed by the continuous sealed bag portions, or cuts the sealed film into one or several sealed bags while maintaining the sealed state. Either form can be adopted.

  The folding step includes a step of folding the bottom portion of the sealing bag to form a bottom wall and a step of folding the top portion, and the heat sealing step heat seals leaving a non-sealed portion on one side wall of the top folding portion. By this, the self-supporting bag with a plug body which has a plug body in the folding part of the top part can be obtained. In addition, the folding step includes a step of folding both sides of the side portion of the sealing bag, and the heat sealing step heat seals leaving an unsealed portion at the top, thereby forming gussets on both sides of the trunk portion. A sealed gusset bag with a plug can be obtained. The folding process may be performed in a state where air is added to the inside of the inflation film in the film manufacturing process to be expanded, and after the film manufacturing process is once flattened, air is added again to the inside. Also good. Then, in the inflation film manufacturing process, the molten resin extruded from the die is pressurized and expanded using sterile air, and in the folding process, the inflation film is pressurized and expanded using sterile air. The inside can form a sterilized sealed bag without being exposed to the outside air.

  As described above, according to the present invention, it is possible to easily form a folded portion by inflating a cylindrical inflation film with air and pushing it in from the outside, and directly from the inflation film on both sides of the side wall or the bottom portion. A sealed bag having a pair of folded portions at the top can be efficiently manufactured, and the manufacturing cost can be reduced as compared with a conventional manufacturing method. Further, by forming the folded portion at the bottom and the top, and heat sealing with the unsealed portion left in the folded portion at the top, and attaching a plug to the unsealed portion, the top folded portion is plugged. A self-supporting bag with a plug having a body can be obtained from an inflation film. On the other hand, by forming the folded portion on both sides of the body portion, a sealed gusset bag in which gussets are formed on both sides of the body portion can be obtained directly from the inflation film.

And by adopting aseptic air as means for inflating the inflation film in the manufacturing process, it is possible to seal the inside while maintaining the sterility, and to obtain a sealed bag that can be applied for aseptic filling without sterilizing the inside. Aseptic filling is possible without fear of deteriorating the resin by sterilization with a wire or the like and without requiring an expensive sterilization apparatus. In addition, by laminating a printed outer layer film or an outer layer film having excellent gas barrier properties on the outer peripheral portion of the inflation film, it is possible to compensate for the disadvantages of an inflation film having poor printing characteristics, and for the type of contents. A sealed bag can be obtained in which the corresponding barrier properties can be easily secured. Furthermore, the reinforcing effect of the container is also obtained.
According to the present invention, another film can be easily laminated or heat-sealed on the surface of the inflation film, and the disadvantages of the bag made of inflation film, which has conventionally been difficult to achieve high-grade multicolor printing, are high-grade multicolor printing. It can be easily overcome by laminating with the finished film. In addition, depending on the conditions of the contents, it can be partially laminated with a barrier wrapping material continuously, and it is possible to obtain a sealed self-supporting bag with excellent contents protection function and storage and display properties at low cost. it can.

The sealing bag according to the embodiment of the present invention is shown in FIG. 7 and FIG. 8, but as a reference example, the sealing bag shown in FIG. 7 and FIG.
Hereinafter, various embodiments and reference examples of the present invention will be described based on the process block diagram of FIG.
The method for manufacturing a bag having a folding portion according to the present invention is a method for manufacturing a self-supporting bag or the like in a sealed state without opening the inside from a tubular film formed by an inflation method, and the inside is aseptically sealed and self-supporting. When manufacturing a pouch, it consists of the following steps.
(I) Steps (1) to (2) for producing an inflation film by extruding into a cylinder from a die of an extruder, and injecting a certain amount of sterile air into the cylinder and expanding it by air pressure.
(Ii) A folding step (3) for forming a fold at a necessary portion while restraining the outer shape of the tubular film in a sufficiently expanded state.
(Iii) Heat sealing step of forming a bag portion by passing a nip roll through a nip roll to make it flat and then heat-sealing the necessary parts such as bottom seal and side seal according to the form of the bag (5).
(Iv) As a sealed bag storage process for storing the sealed bag formed on the inflation film, the bag is wound in a roll shape while maintaining the aseptic condition inside the bag, or folded in a zigzag shape, or in one to several bags. A sealed bag storage step (6) for obtaining a sealed bag by cutting and storing it.

  The above (i) to (iii) are the most basic steps of the manufacturing method of the bag having the folding portion. By this method, for example, a sealed aseptic self-supporting bag as shown in FIG. Can be manufactured. In the above process, after the production of the inflation film in the same manner as the production process of the normal inflation film, as shown in steps (7) and (8) in FIG. Air may be supplied to the inside to expand the inflation film and return to the folding step (3) in that state. Further, when laminating an outer layer film excellent in gas barrier properties or the like, for example, on the outer surface of the sealing bag, an outer layer film material laminating step (15) is provided after the winding step (9), Then, the process may be returned to the step of expanding the inflation film with aseptic air. Alternatively, the laminating step (15) may be provided before the winding step (9). Furthermore, when laminating the outer layer film partially, such as laminating only the branch chamber portion of the sealed branch bag, for example, with a film having a high gas barrier property, the necessary parts such as the bottom portion and the branch portion in the folding step (3) It is desirable to provide a partial outer layer film material laminating step (16) after forming the film, in order to secure the position system of the laminated portion. As the laminating method, known methods such as dry lamination, heat lamination, sandwich lamination, and the like can be used.

  Although the above embodiment is a case where a bag is continuously produced in direct connection with the production process of the inflation film, the production process of the inflation film and the bag production process can be separated. By separating the film production process and the bag making process, there is an advantage that the bag making process that is intermittent feeding can be produced at an arbitrary speed and on another line without being restricted by the film manufacturing process that is continuous feeding. . In that case, as shown in FIG. 1, the case of going through the steps (1)-(2)-(7)-(9)-(8)-(3)-(4)-(5) and (1 )-(2)-(3)-(4)-(10)-(5). In the former case, an inflation film manufactured using aseptic air is temporarily wound into a roll. Of course, in that case, the wound end of the inflation film is sealed. The inflation film wound up in a roll shape is inflated by applying pressure by supplying sterile air again in the bag making line, and then sealed in the inflation film through the steps (3) to (5). A bag part is formed. In the latter case, the folding part is formed in the film production line, and then wound in a roll by a winder, and other processes such as a heat sealing process are performed in the bag making line.

  In addition, according to the method of the present invention, for example, not only when a single row of bags is taken in the width direction in a state where the tubular inflation film is in a flat shape, a plurality of rows are formed according to the diameter of the inflation film and the size of the bag. It can also be formed, can also form a bag having a branch chamber shown as a reference example, and can also produce, for example, a branch bag such as a self-supporting bag having a filling port and a spout branching and a self-supporting bag having a branched small chamber, Further, if necessary, the spout can be formed in a tapered shape so as to be easily poured out. For example, in the case of manufacturing a sealed self-supporting bag having a basic shape (see FIG. 6 (f)) in two rows, the top seal located in the middle portion between rows is performed in the heat sealing step (5) to form two rows. After forming the sealed bag portion and then proceeding to the single row bag group cutting step (12) and cutting the central portion of the top seal portion along the feed direction, an inflation film in which the single row of sealed bags are connected is obtained. .

  Further, when manufacturing a sealed branch bag in which a wide filling port portion and a spout portion protruding in a tapered shape as in the reference example shown in FIG. 14 are branched, a branch portion is formed in the folding step (3), And it is easy to pour by performing heat sealing which forms a spout part in a heat seal process (5), and punching out the perimeter of the heat-sealed spout part in a spout formation punching process (11) after heat sealing Thus, a sealed branch bag having a spout portion with a thin spout protruding and a filling port can be obtained. In addition, in the branch part bending step (13) as necessary, for example, the branch chamber forming the spout part is bent along the bag body body wall side, so that the filling port can be easily opened and filled at the time of filling. It becomes.

  In the sealed bag storage processes 6 and 14, the inflation film having the sealed bag portion formed as described above is wound on a roll or folded in that state, or is packed into one or several sealed bags. Separated and cut and supplied to the aseptic filling line of the filling plant. In the aseptic filling line, after the outer surface of the bag is sterilized and dried, the sealed bag is opened, or a stopper is attached if necessary, and the contents are filled and sealed.

  The inflation film applied to the present invention is not limited to a single resin film, but may be a multilayer film such as a composite inflation film obtained by combining a film excellent in gas barrier properties and heat sealability, such as coextruded 2-5 layers. It goes without saying that a composite blown film can also be applied. Suitable inflation films for use in the present invention are those whose inner surface is made of a resin having heat sealing properties, such as, but not limited to, low-medium-high density polyethylene, isotactic polypropylene. Olefin-based resins such as olefin resins graft-modified with propylene-ethylene copolymers, ethylene-vinyl acetate copolymers, ethylenically unsaturated carboxylic acids or anhydrides thereof; polyamides with relatively low melting points or low softening points A copolyamide resin; a polyester or copolyester resin having a relatively low melting point or a low softening point; In addition, when imparting gas barrier properties to the inflation film itself, for example, a coextruded film of a known gas barrier resin such as ethylene-vinyl alcohol copolymer, vinylidene chloride resin, nylon resin and the above-described resin is used. Can be used. The total thickness of the inflation film used in the present invention is generally 20 to 500 μm, particularly 30 to 300 μm.

  In the present invention, the film laminated on the inflation film is not limited to, for example, metal foil such as aluminum foil, tin foil, copper foil, ethylene-vinyl alcohol copolymer, chloride, etc. Thermoplastic resins such as gas barrier resin films such as vinylidene resins and nylon resins, biaxially stretched polyethylene terephthalate films, biaxially stretched nylon films, biaxially stretched polypropylene films, polycarbonate films, and unstretched films composed of the heat seal resins described above There are films, various papers, and laminates of these.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
2 to 3 schematically show a manufacturing apparatus according to a reference example in manufacturing a basic aseptic sealed self-supporting bag. In FIG. 2, 1 is an extruder, 2 is a die, 3 is an air valve, 4 is a cooling ring, 5 is a guide roller group, 6 is a guide plate, and 7 is a nip roll. The above configuration is the same as a normal inflation device. However, in this embodiment, the air valve is connected to a sterilized air source so that sterilized air is ejected from the air valve 3. Further, a folding tool 10 made of a plate or a bar for folding the bottom wall of the self-supporting bag is provided in the vicinity where the guide plate 6 is located. In this embodiment, since the self-supporting bags are taken in a single row, the folding tool is provided only on one side, but for example, as shown in FIG. 6, when two rows are taken or gusset portions are provided on both sides of the bag Are provided on both sides in the direction perpendicular to the paper surface in FIG.

  Further, 11 is a tensioner-adjusting dancer roll, 12 is a bottom wall heat seal press, and 13 is a trunk wall side edge heat seal press. At the position of the bottom wall heat seal press, a welding prevention sheet 14 (FIG. 3) for preventing welding of the outer surfaces of the bottom walls of the self-supporting bag is disposed so as to be sandwiched in the bottom wall folding portion as necessary. Yes.

  A process for producing a sealed self-supporting bag having an aseptic interior with the apparatus configured as described above will be described with reference to FIGS. The molten resin is extruded into a tube shape from the die 2 by the extruder 1, and a certain amount of sterile air is blown into the tube from the air valve 3, and is expanded by air pressure to form a tubular inflation film 16 ( FIG. 3 (a)). When the position of the folding tool 10 is reached while maintaining the expansion state by the air pressure, the folding tool bites into the outer peripheral surface of the film which is gradually expanded and folds the portion 17 which becomes the bottom wall, and is tapered in a direction perpendicular to the folding tool 10. The guide plate 6 is gradually crushed from both sides into a flat shape (FIGS. 3B to 3D). Thereafter, by passing through the nip roll 7, a flat gusset film in which folds are continuously formed on the bottom wall and both side wall edges folded into a gusset shape is obtained, and after the dancer roller 11, the next heat sealing step is performed. Transition.

  In the heat sealing process, first, when reaching the place where the bottom wall heat seal press 12 is disposed, the welding prevention sheet is gathered between the bottom wall folding portions as shown in FIG. The bottom seal of the self-supporting bag is performed by the seal press (FIG. 3 (e)). At that time, by heat-sealing with the anti-welding sheet 14 sandwiched, in the case of a film made of a single layer of a heat-adhesive resin, it is possible to prevent the outer surfaces of the bottom walls from being welded to each other. Can be formed. In the case of a composite blown film whose outer surface is made of a non-thermal adhesive resin layer, it is not necessary to provide the above-mentioned anti-welding sheet, but bonding between the outer peripheral surfaces of the bottom walls in the side seal portion for imparting self-supporting properties is hot. It can be carried out with a melt-type adhesive agent or the like. In addition, when the non-thermoadhesive resin layer is provided by lamination, it is possible to provide a hole in the outer layer film material before lamination so that only a necessary portion has heat sealability.

  Next, a side seal for simultaneously heat-sealing the side edges of the barrel walls of adjacent bags is performed by the barrel side wall heat seal press 13. Thereby, the self-supporting bag rows partitioned in a sealed manner are sequentially formed on the inflation film. The inflation film 16 ′ in which the bag rows are continuously formed in this way is wound in a roll shape as shown in FIG. 2, folded in a zigzag shape as shown in FIG. 4, or a side seal portion. 19 (FIG. 5) are cut sequentially and separated into one or several sealed self-supporting bags and stored. The thus-obtained sealed self-supporting bag trains wound or folded or the sealed self-supporting bags separated into one or several pieces are opened at the filling port in the aseptic room of the filling plant. The self-supporting bag is inflated with aseptic air in the inflation film manufacturing process and manufactured without contact with the outside air, so that the inside of the bag is maintained in a sterile state and is sterile. The filling line can be subjected to aseptic filling without internal sterilization. FIG. 5 shows an example of a work process in a filling factory (sterile room) when wound in a roll shape. The inflation film 16 ′ in which the bag row is formed is sterilized on the outer surface while being rewound, and is opened by the slitter 25. Then, it is cut from the middle of the side seal portion 19 by the cutter 26, separated into individual free-standing bags 21 as shown in FIG. 6 (f), and supplied to an aseptic filling machine for aseptic filling.

  In the above manufacturing process, the side seal process and the bottom seal process are not necessarily limited to the above order, and the bottom seal may be performed after performing the side seal as necessary. Further, when two rows of bags are taken from the inflation film, or when a self-supporting sealed bag having folded portions on both sides of the bottom and the top is manufactured, as shown in FIG. As shown in FIG. 6 (e), an inflation film 22 ′ in which a bag row having folds is formed on both sides is obtained by pushing and folding the tool and performing bottom sealing on both sides. As shown in FIG. 5, a single-row open self-supporting bag row is obtained, and the self-supporting bag 21 is obtained by cutting it from the side edge seal portion (f). 6 (g), in order to obtain a sealed self-supporting bag 23 having folded portions on both sides of the bottom and top, the bag is cut from the state of FIG. 6 (e) along the center portion of the side seal portion. It ’s fine. In addition, although the sealing self-supporting bag 23 shown in the figure is provided with a plug 24 at the top folding portion, the plug may be appropriately attached by a known method such as heat sealing in a filling factory.

  FIG. 7 shows an example of a method for manufacturing the self-supporting bag 23 according to the embodiment of the present invention in which a plug is provided in the folding portion. In the manufacturing process shown in FIG. 6, heat sealing is performed in a state where an unsealed portion 27 into which the plug body 24 can be inserted is left on the side wall on one side of the folded portion on the side where the plug body 24 is provided in the heat sealing process. A sealed self-supporting bag 23 ′ as shown in FIG. The aseptic self-supporting bag 23 ′ thus obtained is aseptically filled in a factory, and the unsealed portion is opened by cutting the end fold portion of the unsealed portion 26 as shown in FIG. By sealing the plug 24 into the opening as shown in FIG. 5B, a sealed self-supporting bag with plug having a plug in the folded portion is obtained as shown in FIG. It is done. In the above process, since the folded portion is symmetrical with respect to the side walls on both sides, the side wall on the side where the plug is mounted is slightly shortened because the tip fold portion 28 is cut, or on the other side. The fold 28 'must also be cut simultaneously. In order to solve this problem, in the folding step, as shown in FIG. 4 (d ′), by folding so that the fold portion 29 on the side where the plug is mounted is longer than the fold portion 29 ′ on the other side. One fold portion 29 protrudes from the other fold portion, and as shown in FIG. 5 (e '), only 29 can be easily cut, and the unsealed portion 27 attached to the plug is easily opened. Therefore, the self-supporting bag 23 with a plug body that has the same height and the same height can be obtained.

  FIG. 8 shows an embodiment in which a sealed gusset bag 30 having folded portions 31 on both sides of the side portion as shown in FIG. In that case, if the top-and-bottom direction of the bag coincides with the feeding direction of the inflation film, the folding process can be performed in the same manner as in the reference example shown in FIG. In the heat sealing step, if the transverse heat sealing is intermittently performed at right angles to the feeding direction so as to match the shape of the bottom and top of the bag, the sealed gusset bag as shown in FIG. An inflation film 34 formed continuously in the direction is obtained. And the sealing gusset bag 30 which has a folding part on both sides as shown to the same figure (f) can be obtained by cut | disconnecting in the horizontal direction from the middle of the horizontal heat seal part 32. FIG. In addition, although the gusset bag 30 shown to the same figure (f) has shown the case where the plug body 33 was provided in the top part in the filling factory, this plug body should just be provided as needed and it is not provided. Also good.

  Furthermore, FIG. 9 shows another reference example. This reference example shows a modification in the case where two rows are taken from the inflation film 40. In the case of this embodiment, the inflation film 40 expanded with aseptic air is once passed through the nip roll and flattened, and then the longitudinal heat seal is performed along the central portion in the feed direction. Can be obtained by separating the film from the slitter into two rows and having the longitudinal heat seal portion 41 on the side in the feed direction. The inflation film 42 thus obtained is again inflated with sterile air, and the sealed self-supporting bag 43 can be obtained in the same manner as shown in FIGS. In that case, the vertical heat seal portion is the top seal portion 44 of the sealed self-supporting bag. In order to expand the inflation film in a sealed state again with aseptic air, an appropriate method can be employed, for example, by attaching aseptic air supply nozzle needles such as injection needles to the inflation film and supplying aseptic air.

  Next, a manufacturing method of a sealed branch type self-supporting bag having a filling port and a spout port as shown in FIG. 14 as a reference example will be described. The branch type self-supporting bag 51 shown in FIG. 14 has a spout portion 54 and a filling port portion 55 formed by folding the trunk wall 52 or the trunk wall 53 so that they can be folded back at a first folding position 56 and formed separately. Has been. The filling port portion 55 is formed to have the same width as the bag width, but the spout portion 54 is formed with a tapered spout 57 so as to be easily poured out. With such a structure, the sealed self-supporting bag is useful as a self-supporting bag for aseptic filling having excellent filling properties and dispensing properties.

  In addition, the sealed branch type self-supporting bag 51 is configured such that the outlet port 54 has a trunk wall as shown in FIGS. 14 (a-1) and (a-2) in a normal state such as a distribution process filled with contents. It is folded back to the side and the filling port 55 is located at the top. When the body wall is pressed in this state, the inner solution spreads to the side of the filling port that extends straight, and pressure acts directly on the filling port seal portion, but the bent outlet portion 54 has a first pressure. The pressure is relieved at the bent position, so that almost no liquid flows out into the spout 54 and almost no pressure acts on the spout 57 at the tip. Therefore, even if the spout is sealed with an easy-open seal 58 so that it can be easily opened, or score processing for tearing and opening is performed, there is no possibility that the spout opens and the internal solution leaks during the distribution process.

  A reference example of the method for manufacturing the branched self-supporting bag will be described with reference to FIGS. In this reference example, the case where two rows of sealed branched self-supporting bags are taken from the inflation film and the production process of the inflation film and the bag making process are separated is shown. As shown in FIG. 10, the inflation apparatus for performing the inflation film manufacturing process is almost the same as that shown in FIG. 2, and therefore, the same members are denoted by the same reference numerals and detailed description thereof is omitted. In this example, a pair of bottom wall folding tools 60 made of a plate or a bar for folding the bottom wall of the self-supporting bag in the vicinity where the guide plate 6 is located, and a pair spaced apart from the bottom wall folding tool 60 by a predetermined angle. The branch chamber folding devices 61 and 61 'are provided respectively. FIG. 11 schematically shows a cross section of the inflation film in the corner process in the schematic diagram of the manufacturing process. FIGS. (Ia to Id) show the case where the folding portions constituting the branch chamber are formed on the opposite side wall when two rows of the branch type self-supporting bags are taken from the inflation film. FIGS. (II-a to II-d) show the case where the branch chamber is formed on the body wall on the same side. Hereinafter, FIG. 11 (Ia to Id) will be described.

  In the inflation apparatus configured as described above, the molten resin is extruded from the die 2 into a tube shape by the extruder 1, and a certain amount of sterile air is blown into the tube from the air valve 3, and is expanded by air pressure. A cylindrical inflation film 62 is formed (FIG. 11 (Ia)). When reaching the position where the folding tool is provided while maintaining the expanded state by the air pressure, the bottom wall folding tool 60 bites into the gradually expanding film outer peripheral surface and folds the portion 63 which becomes the bottom wall, and the branch chamber folding tool 61 As shown in FIGS. 11 (Ib) and 11 (Ic), the portion 64 constituting the branch chamber is folded into the outer peripheral surface of the film which becomes the barrel wall on one side. In this way, the inflation film 62 passes through the portion where the folding tool and the guide plate are disposed, and further passes through the nip roll 7, so that the cross section of the inflation film 62 is on both sides and above as shown in FIG. 11 (Id). The film is folded into a flat film having a pair of folded portions on the wall, and is wound up in a roll shape in this state. In this way, a folded film roll body 66 of the folded inflation film 65 in which folded portions are continuously formed is obtained. From the folded film roll body 66 thus obtained, a sealed branch type self-supporting bag is formed in the next bag making line. 11 (II-a) to (II-d) are schematic diagrams corresponding to the above (Ia) to (Id) in the case where two rows of folded portions are formed on the same body wall side. is there.

  FIG. 12 shows an example of a bag making line for that purpose. In this example, two sealed branched self-supporting bags are formed in the width direction so that the spouts face each other, and two bags are manufactured simultaneously. When the folded inflation film 65 rewound from the folded film roll body 66 reaches the KK position in FIG. 12, the bottom wall is folded by a bottom seal press 70 arranged vertically at the position. The part 63 which becomes becomes heat-sealed. At the same time, a top seal portion 72 is formed by heat-sealing the intermediate portion in the width direction corresponding to the filling port end positions of the two sealed branch-type bags facing each other by the top seal press 71.

  Next, when the position LL is reached, the body wall side seal portion 74 is sealed by being sandwiched from above and below by a side seal press 73 disposed across the position in the width direction. The side seal press 73 is twice as wide as the side seal portion 74 of the sealed branch type self-supporting bag shown in FIG. 13 in the width direction of the body wall material, and the folded inflation film 65 is sealed branch type self-supporting. Operates intermittently each time it is fed a distance equal to the width of the bag. Thereby, the side seal part of the sealing branch type self-supporting bag adjacent to each other in the feeding direction is simultaneously sealed. In addition, a pair of spout forming seal presses 75 whose press surfaces have the shape of the spout forming seal portion 76 shown in FIG. 13 are disposed at the MM position, and the body wall materials of the spout 54 are thermally bonded together. Thus, the tapered spout portion 54 is formed. A punching die 77 for punching the outer peripheral edge of the spout forming seal portion 76 is disposed at the N-N position, and when the die is operated, a portion other than the spout is cut and removed from the spout forming portion. Two sealed bifurcated self-supporting pouch portions 78 in which the spout portions face each other are formed.

  In the OO position, a slitter 80 for separating the sealed bifurcated self-supporting pouches connected at the end of the spout into a single row is arranged so that the cutting edge protrudes from the conveying surface, and the inflation film passes through this position. Separated from the center. Thereby, in FIG. 12, the upper sealed branch type self-supporting bag row 81 and the lower sealed branch type self-supporting bag row 82 are separated. On the downstream side, a folding guide member group 82 for folding the spout portion 54 to the trunk wall side is disposed in contrast to the upper row and the lower row, and the spout portion 54 is folded back to the barrel wall side. Along with this, the filling port portion 55 folded back on the barrel wall side is raised, and the filling port portions 55 face each other until reaching the RR position via the PP position. In the present embodiment, at the QQ position, a dotted seal press 83 is arranged so that the folded spout portion 54 does not rise carelessly, and the ear portion of the spout portion is placed on the side edge of the trunk wall. The scoring process may be omitted.

  As described above, a sealed and branched self-supporting bag portion is formed continuously with the inflation film, and the film is wound or folded in that state. Alternatively, as shown in FIG. 12, the middle of the trunk side seal portion is cut by a cutter 84, so that the spout portion as shown at the left end of FIG. Two pouches 51 are obtained sequentially. As described above, according to the present embodiment, the sealed bifurcated self-supporting pouch 51 in which the filling port and the spout are branched can be easily manufactured without exposing the inner surface to the outside air from the inflation film.

  Next, an example of a manufacturing method of a sealed multi-compartment branching self-supporting bag having branched small chambers as shown in FIG. The sealed multi-chamber branching self-supporting bag of this example has the same basic structure as the branching self-supporting bag, and the second branch chamber 91 corresponding to the spout part of the reference example is separated from the bag body chamber 92. It is a storage chamber, and the first branch chamber 93 is a filling port portion as in the above example. In this example, an easily openable seal portion 95 is formed at a position slightly away from the primary folding position 94 with respect to the trunk wall of the second branch chamber 91, and the second branch chamber 91 is completely separated from the bag body chamber 92. The contents stored in the respective rooms are not inadvertently mixed in the distribution process or the like. The easy-open seal can be formed by adjusting the heat seal temperature as the simplest method. Moreover, it can carry out by arbitrary methods, such as extruding the blend layer of an incompatible resin in a stripe form to a required part, and providing it by sealing a tape.

  For example, easy peelability for securing an easy-open seal is achieved by interfacial peeling, delamination, or cohesive failure. Thus, examples of interfacial peeling or delamination include linear low density polyethylene and polypropylene resin, linear low density polyethylene and cyclic polyolefin resin, linear low density polyethylene and polybutene-1 resin, low There are combinations of crystalline copolyester and polycarbonate. Moreover, the layer of the blend which added incompatible resin also shows cohesive failure, and can be used conveniently. Examples of these include blends of polyethylene and polypropylene, polyethylene and polybutene, etc. By adjusting the blending ratio, an easily peelable seal can be applied to a base material layer such as polyethylene, polypropylene, and polybutene. Can be formed.

  The feature of the sealed multi-chamber branch type self-supporting bag 90 of the present reference example is that the first branch chamber 93 and the second branch chamber 91 are formed by folding the inflation film, and the first branch chamber 91 and the second branch chamber 91 are formed at the distribution stage as shown in FIG. When the second branch chamber 91 is folded from the folding position to the bag body chamber side, the pressure is relieved at the first folding position 94 even if the trunk wall is compressed, and the second branch chamber 91 is peeled off to the seal portion of the secondary storage. Pressure hardly acts. Therefore, even if the seal of the branch part of the second branch chamber is sealed in an easily openable heat seal or in a state of being easily peeled off such as pseudo-adhesion, the seal may be peeled off at the distribution stage and the contents may be mixed carelessly. No sealed multi-chamber branching self-supporting bag is obtained. In use, when the second branch chamber 91 is raised and the body wall of the bag body chamber is pressed in a state where the second branch chamber 91 is positioned on the extension of the bag body chamber, the content liquid stored in the bag body chamber is passed through. Since a strong peeling pressure corresponding to the applied pressure acts on the easily openable seal portion 95 of the second branch chamber, the contents easily stored in the two chambers are easily mixed in the bag.

  Another feature of this sealed multi-chamber branch type self-supporting bag 90 is that the barrier films 96 and 97 having high barrier properties required according to the contents filled in the second branch chamber 91 are individually provided. It is coated or laminated (simply referred to as coating). For example, if the contents stored in the second branch chamber require shielding from the outside air, moisture, or light, and the contents stored in the bag body chamber do not require them, only the sub-storage chamber is By covering with a film having a high barrier property, a low-cost sealed multi-chamber branching self-supporting bag suitable for filling these contents can be obtained. In addition, these films are not completely integrated with the inflation film constituting the second branch chamber wall, and only a peripheral portion is bonded to form a space between the inflation film and the space shown in FIG. As shown in c), for example, by storing the oxygen scavenger 98, when the inflation film is inferior in gas barrier properties, the content 99 filled in the second branch chamber can be prevented from being oxidized and deteriorated, etc. Others can be accommodated using the space between the inflation film and the barrier film.

  An example of the manufacturing method of the sealed multi-chamber branch type self-supporting bag configured as described above will be described with reference to FIGS. In FIGS. 16 and 17, reference numeral 100 denotes a folded inflation film, and portions that become the first branch chamber 93 and the second branch chamber 91 are formed by folding as in the above example. Similarly, the folded inflation film 100 is rewound, and first a bottom seal and a top seal are performed, and then an easy-open seal is performed near the base of the second branch chamber. Then side seal is performed.

  The barrier film materials 96 and 97 for covering both wall surfaces of the second branch chamber 91 are unwound from the roll bobbin and supplied to both sides of the second branch chamber portion by appropriate guide means (FIG. 17B). 16, the barrier material seal press 103 covers both wall surfaces of the second branch chamber at the TT position in FIG. The heat seal may be heat-welded to the entire surface of the second branch chamber wall, or only the peripheral edge may be welded, and can be appropriately selected as necessary. Further, the barrier film materials 96 and 97 are not necessarily the same material. For example, the barrier film material supplied to the surface side in the normal state is made transparent so that the contents stored in the second branch chamber are externally supplied. It can be appropriately selected as necessary, such as making it visible. After that, it is cut by the cutter 104 along the center line cc at the U-U position and separated into two rows, and it is wound up in a roll shape, folded, or one to several sealed branches as in the above embodiment. Separate into mold self-supporting bags. When the cutter 104 is not used, it is supplied to the filling plant in a roll or folded state with the tops of adjacent bags in two rows connected or in an even number of sealed bags connected. The In this case, the top seal can be omitted.

  The sealed multi-chamber branch type self-supporting bag manufactured as described above is cut and opened at the end of the second branch chamber in the aseptic room of the filling factory, and the contents such as powder agent are contained in the second branch chamber 91. The second branch chamber 91 is folded on the bag body chamber wall, and the end of the first branch chamber is opened to open the filling port, and the contents in the bag body chamber 92 are opened. And the filling port is hermetically sealed to obtain a multi-chamber branched self-supporting bag in which the contents are aseptically filled and sealed as shown in FIG.

  As described above, a sealed multi-chamber branching self-supporting bag having a second branch chamber can be automatically manufactured in a continuous process. And according to the said embodiment, when not sealing a 2nd branch chamber base part, when carrying out a heat seal completely strongly, and also carrying out an easy-open seal, it can be performed by a continuous process. Moreover, the second branch chamber and the bag body chamber can be separately covered with a barrier material as necessary.

  Although various embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications can be made. For example, in the above embodiment, the inside of the inflation film is pressurized by using sterile air in the production process and the folding process of the inflation film to obtain a sealed self-supporting bag whose interior is sterile, and the sterile filling line is internally sterilized. However, when a self-supporting sealed bag that is not applied to aseptic filling is obtained, the inside of the inflation film may be pressurized using normal air.

  Further, in the case of taking two rows, the case where the spout portions are formed toward the center line side is shown, but on the contrary, the spout portions can be manufactured toward the outside. Furthermore, the manufacturing method of the sealing bag which has a folding part of this invention is not restricted to 1 row | line | column or 2 row | line | column taking like the said Example, According to the magnitude | size of a bag, such as a 3 row | line take, and the diameter of an inflation film Selectable. Moreover, although the case where only the branch chamber was laminated after bag making was shown in the said Example, in this invention, all or a part of inflation film can be laminated before bag making. Thereby, for example, a pre-printed outer layer film can be easily laminated on the entire bag, and the printing characteristics of the inflation film can be overcome.

  FIG. 18A shows an example in which heat lamination is continuously performed over the entire circumference of the inflation film as shown in FIG. In the figure, reference numeral 110 denotes an inflation film, and the outer layer film sheet 111 is guided around the inflation film in a state where the inflation film is sufficiently inflated through appropriate guide rolls 112 and a former 113, and is fed around the inflation film. Then, it passes through a pair of rubber rolls 114 and heater rolls 115 and is heated and pressed in a flat state, and the outer layer film 111 is laminated on the entire circumference of the inflation film as shown in the sectional view of FIG. In the figure, reference numeral 116 denotes a guide plate.

  FIG. 19A shows an embodiment in which dry lamination is partially performed on an inflation film as shown in FIG. After forming, the inflation film 120 is flattened by passing through the nip roll 121, and in that state, the inflation film 120 is guided to an appropriate guide roll 122 for lamination (in the embodiment shown in the figure, the center on both sides). The outer layer films 123 and 124 are superposed and fed and passed through the dry lamination nip roll 125, whereby the outer layer film is laminated at a desired location of the inflation film. In the figure, reference numeral 127 denotes a guide plate for an inflation film forming apparatus. From the laminated inflation film, a sealed bag having a folded portion can be manufactured through steps (8) to (3) in the process block diagram shown in FIG. 1 in the same manner as described above.

  The sealed bag having the folded portion and the manufacturing method thereof according to the present invention can obtain a bag having a plurality of folded portions directly from the inflation film, and can form the folded portion in a state where aseptic air is added. Since the inside can be provided to an aseptic filling plant while maintaining a sterile sealed state, the present invention is not limited to ordinary filling bags, and is highly usable as an aseptic filling bag for ordinary foods and chemicals.

It is a process block diagram showing embodiment of the manufacturing method of the sealing bag which has a folding part of this invention. It is a schematic diagram which shows the manufacturing process of the sealing bag which concerns on the basic form which has a folding part. (A)-(f) is each surface schematic diagram for demonstrating the sealing bag manufacturing process in the AA-FF cross section of FIG. It is a schematic diagram which shows the sealed bag storage form stored in the folded state. It is a schematic diagram which shows the process of opening the bag mouth of the filling factory of the inflation film formed in the manufacturing process shown in FIG. 2 in a row, and separating into individual bags. (A)-(g) is a schematic diagram for demonstrating the manufacturing process of the sealing bag which has a folding part which concerns on the Example of this invention. (A)-(e ') is process drawing explaining the plug body mounting | wearing method which mounts a plug body to the sealing bag which has a folding part which concerns on the other Example of this invention. (A)-(f) is a schematic diagram for demonstrating the manufacturing process of the sealing bag which has a folding part which concerns on the further another Example of this invention. (A)-(i) is a schematic diagram for demonstrating the manufacturing process of the sealing bag which has the folding part which concerns on a reference example. It is a schematic diagram which shows the inflation film manufacturing process and folding process in the manufacturing process of the sealing branch type self-supporting bag which concerns on the reference example of this invention. (Ia)-(Id) are the cross-sectional schematic diagrams for demonstrating the sealing bag manufacturing process in the GG-JJ cross section of FIG. 10, (II-a)-(II-d) These are the cross-sectional schematic diagrams corresponding to (Ia)-(Id) at the time of providing a folding part in the same side. (A) is a plane schematic diagram which shows the bag making process following FIG. 12, (b) is the cross-sectional schematic diagram. It is each cross-sectional schematic diagram in the KK-RR cross section in FIG. The sealing branch type self-supporting bag which concerns on the reference example of the sealing bag which has a folding part of this invention is shown, (a-1) is the front view of the state which folded the spout part, (a-2) is filled with the contents (B-1) is a front view of a state in which the spout portion is raised, and (b-2) is a schematic diagram of the central section in a state where the contents are filled. . The sealing branch type self-supporting bag which concerns on the other Example of the sealing bag which has a folding part of this invention is shown, (a) is a perspective view, (b) is a center sectional view in the state with which the contents were filled, (C) is a principal part cross-sectional schematic diagram of the state which accommodated the oxygen scavenger between the barrier film and the 2nd branch chamber wall. It is a plane schematic diagram which shows the bag making process in manufacture of the sealing bag shown in FIG. It is each cross-sectional schematic diagram in the KK-RR cross section in FIG. (A) is a perspective view which shows the manufacturing process which heat laminates continuously over the perimeter of an inflation film, (b) is a cross-sectional schematic diagram of the laminated inflation film. (A) is a perspective view which shows the manufacturing process which heat-laminates partially continuously on both sides of an inflation film, (b) is a cross-sectional schematic diagram of the laminated inflation film.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Extruder 2 Die 3 Air valve 4 Cooling ring 6 Guide plate 7 Nip roll 10 Pushing tool 11 Dancer roll 12 Bottom seal press 13 Side seal press 14 Weld prevention sheet 16, 22, 34, 40, 42, 62 Inflation film 17 Bottom wall 19 Side seal part 20 Bottom seal part 21, 23, 43 Sealing self-supporting bag 24 Plug body 30 Sealing gusset bag 31 Folding part 32 Lateral heat seal part 51 Sealing branch type self-supporting bag 54 Outlet part 55 Filling port Portion 56 Folding position 57 Spout 60 Bottom wall folding tool 61 Branch chamber folding tool 65, 100 Folded inflation film 66 Folded film roll body 70 Bottom seal press 71 Top seal press 73 Side seal press 75 Spout for forming outlet 77 Punching die 83 Dotted seal press 90 Sealed multi-chamber branch type self-supporting bag 92 Second branch chamber 92 Bag body chamber 93 First branch chamber 95 Easy-open sealable portions 96, 97, 101, 102 Barrier film 98 Deoxygenation Agent 103 Barrier seal seal 110, 120 Inflation films 111, 123, 124 Outer film sheet 115 Heater roll

Claims (10)

  A folded portion in which at least the inner layer is formed from a tubular inflation film, the folded film is formed with the inflation film remaining in an endless state in the circumferential direction, and the heat seal portion is formed with the bag inside sealed A sealed bag, wherein the folded portion is a pair of folded portions formed on both sides or bottom and top of the body portion of the sealed bag.   A self-supporting bag with a plug formed by forming the folded portion at the bottom and the top, heat-sealing with the unsealed portion remaining in the folded portion at the top, and mounting a plug on the unsealed portion. Item 2. A sealed bag according to item 1.   The sealed bag according to claim 1, wherein the folded portion is a sealed gusset bag formed on both sides of the body portion.   The sealed bag according to any one of claims 1 to 3, which is a sealed bag for aseptic filling in which the inside is kept sterile and sealed.   The sealed bag according to any one of claims 1 to 4, wherein an outer layer film is laminated on at least a part of an outer peripheral portion of the inflation film.   A method of manufacturing a bag having a folded portion from an inflation film in a sealed state, the film production step for producing an inflation film, the step of laminating or heat-sealing another film member on at least a part of the outer surface of the film, and a cylindrical shape A folding process for forming a folded part by pushing the outer peripheral surface of the blown film inward in a state where air is added to the inside of the blown film to inflate, and heat sealing for forming a sealed bag part by heat-sealing a predetermined portion The manufacturing method of the sealing bag characterized by including the process and the sealing bag storage process of storing the sealing bag formed in the inflation film.   The folding step includes a step of folding the bottom portion of the sealing bag to form a bottom wall and a step of folding the top portion, and the heat sealing step heat-seals the unsealed portion on the side wall on one side of the top folding portion. The manufacturing method of the sealing bag of Claim 6 characterized by the above-mentioned.   The sealed bag manufacturing method according to claim 6, wherein the folding step includes a step of folding both sides of the side portion of the sealed bag, and the heat sealing step heat seals leaving an unsealed portion at the top. Method.   The method of manufacturing a sealed bag according to claim 6, 7 or 8, wherein the folding step is performed in a state where air is added to the inside of the inflation film and inflated in the film manufacturing step.   In the inflation film manufacturing process, the molten resin extruded from the die is pressurized and expanded using sterile air, and in the folding process, the inflation film is pressurized and expanded using sterile air. The manufacturing method of the sealing bag in any one of Claims 6-9 which forms an aseptic sealing bag inside without being exposed.

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