JP7381862B2 - Bag making and filling method, bag making and filling system - Google Patents

Description

The present invention relates to a bag making and filling method and a bag making and filling system.

Patent Document 1 discloses a method in which a laminated film having an adhesive layer is sterilized by contacting with a sterilizing agent made of hydrogen peroxide solution, and then the laminated film is made and filled into bags.

Japanese Patent Application Publication No. 2015-81142

In the method of Patent Document 1, when the adhesive layer of the laminated film comes into contact with a disinfectant, the laminated film may peel off.

The present invention has been made in view of these circumstances, and provides a bag making and filling method that can suppress peeling of the laminated film.

According to the present invention, the bag making and filling method includes a sterilization step and a bag making and filling step, and in the sterilization step, a multi-layered film formed by flattening a cylindrical laminated film having an adhesive layer is used. The multi-layered film is sterilized by contacting with a disinfectant, and in the bag making and filling process, the sterilized multi-layered film is heat-sealed to form a cylindrical body with a closed bottom end. A method is provided in which the upper end of the cylindrical body is sealed by heat sealing after filling the cylindrical body.

In the present invention, a multi-layered film formed by flattening a cylindrical multi-layered film is brought into contact with a disinfectant. In such a multi-layered film, the adhesive layer is not exposed at the edges in the width direction, so the adhesive layer does not come into contact with the disinfectant. Therefore, peeling of the laminated film due to the disinfectant is suppressed.

Various embodiments of the present invention will be illustrated below. The embodiments shown below can be combined with each other.
Preferably, in the method described above, the sterilizing agent is a sterilizing liquid, and the sterilizing step is performed by immersing the multi-layered film in the sterilizing liquid.
Preferably, in the method described above, the multi-layered film includes an inner laminated film and an outer laminated film facing each other, and the inner laminated film is removed after the sterilization step and before the bag-forming and filling step. The method includes a press-bonding step of press-bonding a film and the outer laminated film.
Preferably, the bag making and filling system includes a sterilizing device and a bag making and filling device, wherein the sterilizing device applies a sterilizing agent to a multi-layered film formed by flattening a cylindrical laminated film having an adhesive layer. The multi-layered film is sterilized by contacting the multi-layered film, and the bag making and filling device heat-seals the sterilized multi-layered film into a cylindrical body with a closed bottom end. This system heat-seals the upper end of the cylindrical body after filling.

FIG. 1A is a diagram showing the layer structure of the cylindrical laminated film 2, and FIG. 1B is an enlarged view of region B in FIG. 1A. FIG. 2A is a diagram showing the layer structure of the multilayer film 1, and FIG. 2B is an enlarged view of region B in FIG. 2A. FIG. 3A is a perspective view of the packaging bag 10. FIG. 3B is a cross-sectional view of the vicinity of the vertical seal portion 22. It is an explanatory view for explaining a method of bag making and filling.

Embodiments of the present invention will be described below. Various features shown in the embodiments described below can be combined with each other. Further, the invention is established independently for each characteristic matter.

1. Multi-layered film 1
As shown in FIGS. 1 and 2, the multi-layered film 1 is constructed by flattening a cylindrical layered film 2. As shown in FIGS. As shown in FIG. 1, the cylindrical laminated film 2 is a cylindrical laminated film and includes an inner layer 2a, an adhesive layer 2b, an intermediate layer 2c, an adhesive layer 2d, and an outer layer 2e. The inner layer 2a, the intermediate layer 2c, and the outer layer 2e are bonded to each other by adhesive layers 2b and 2d.

As shown in FIG. 2, the multiple laminated film 1 includes an inner laminated film 11 and an outer laminated film 12 facing each other. The inner laminated film 11 and the outer laminated film 12 each include layers 11a to 11e and 12a to 12e derived from layers 2a to 2e. The inner layer 11a, the intermediate layer 11c, and the outer layer 11e are bonded to each other by adhesive layers 11b and 11d. The inner layer 12a, the intermediate layer 12c, and the outer layer 12e are bonded to each other by adhesive layers 12b and 12d.

The inner laminated film 11 and the outer laminated film 12 are connected to each other at the edge 1a in the width direction. Therefore, in the multi-layer film 1, the adhesive layers 11b, 12b, 11d, 12d (hereinafter referred to as the adhesive layer 11b etc.) are not exposed at the edge 1a in the width direction, and the adhesive layer 11b etc. are sterilized in the sterilization process described later. Since the disinfectant does not come into contact with the disinfectant, peeling of the laminated films 11 and 12 constituting the multi-layered film 1 is suppressed from occurring due to the disinfectant. Further, in the case of a configuration in which the adhesive layer is exposed at the edge in the width direction as in Patent Document 1, there is a risk that the sterilizer will enter between the layers from the edge, but in this embodiment, there is no such risk. Furthermore, in the configuration of Patent Document 1, a special adhesive with particularly high adhesive strength may be used in order to suppress peeling of the laminated film, but using such an adhesive reduces the flexibility of the laminated film. This may cause the laminated film to become stiff. When the packaging bag 10 (see FIG. 3) is produced by bag making and filling using such a laminated film, the packaging bag 10 is likely to be bent, and the packaging bag 10 may be easily torn at the bent portion. . On the other hand, in this embodiment, since the adhesive layer 11b and the like do not come into contact with the disinfectant, there is no need to use a special adhesive, and the occurrence of tearing of the packaging bag 10 is suppressed.

In one example, the multi-layered film 1 is formed by expanding a cylindrical parison formed by coextrusion (that is, by inflation molding) to form a cylindrical laminated film 2, and then crushing the cylindrical laminated film 2. It can be formed by flattening. The cylindrical laminated film 2 can be flattened, for example, by being sandwiched between a pair of pressing members (eg, rollers). As a result, a multi-layered film 1 composed of an inner layered film 11 and an outer layered film 12 connected at the edge 1a is obtained. Since the films 11 and 12 are pressure-bonded to each other by the pair of pressure-bonding members, the inner layers 11a and 12a of the films 11 and 12 are in close contact with each other (pseudo-adhesion). Note that, in FIG. 2, the inner layers 11a and 12a are shown separated from each other for convenience of illustration. The multi-layered film 1 is wound into a roll to form a roll-shaped original fabric F shown in FIG. In the bag making and filling method using the multi-layered film 1, it is preferable that the multi-layered film 1 is supplied by unwinding the roll-shaped original fabric F. The thickness of the multilayer film 1 is, for example, 20 to 300 μm, preferably 70 to 140 μm.

The inner layers 11a, 12a and the outer layers 11e, 12e are preferably made of thermoplastic resin having heat sealability. Examples of such resins include polyolefin resins such as low-density polyethylene, linear low-density polyethylene, medium-density polyethylene, high-density polyethylene, polypropylene, propylene-ethylene copolymer, and polyamides with relatively low melting points or low softening points. Other examples include copolyamide resin, polyester or copolyester resin, and polycarbonate resin.

When the inner layers 11a and 12a have heat-sealability, when the multi-layer film 1 is heat-sealed to form the multi-layer film 1 into a bag shape, the heat-sealed portion (the vertical seal portion 22 and the horizontal seal portion in FIG. 2) The inner layers 11a and 12a are welded at the portions 23 and 24), improving the rigidity of the heat-sealed portion. If welding of the inner layers 11a and 12a is not necessary, the inner layers 11a and 12a can be omitted.

When bags are made and filled using the multi-layered film 1, the inner layers 11a and 12a do not come into contact with the contents, and the outer layer 11e of the inner layered film 11 comes into contact with the contents. Therefore, in order to suppress the transfer of additives to the contents, it is preferable that the material constituting the outer layer 11e is additive-free. In particular, when the contents are subject to the "Ministerial Ordinance on Ingredient Standards for Milk and Dairy Products," such as milk, there is technical significance in making the material constituting the outer layer 11e additive-free. is remarkable. On the other hand, for the purpose of improving the flexibility of the multilayer film 1, additives such as a softener may be added to the inner layers 11a and 12a.

The intermediate layers 11c, 12c are preferably made of a material having a higher melting point than the inner layers 11a, 12a and the outer layers 11e, 12e. In this case, the inner layers 11a, 12a and the outer layers 11e, 12e melt, but by heat sealing at a temperature at which the intermediate layers 11c, 12c do not melt, stable heat sealing can be achieved. Such materials include resins containing polyamide. The constituent resin of the intermediate layers 11c and 12c may be only polyamide, or may contain other resins. As other resins, resins that increase the rigidity of the intermediate layers 11c and 12c are preferable. The content of polyamide based on all the resins constituting the intermediate layers 11c and 12c is preferably 50% by mass or more. Specifically, this content is, for example, 50, 60, 70, 80, 90, 100% by mass, and may be within a range between any two of the numerical values exemplified here.

The adhesive layer 11b and the like are preferably made of a material that has adhesive properties, and examples of the adhesive material include acid-modified polyolefin (e.g., maleic anhydride-modified polyethylene) obtained by introducing carboxyl groups into the above-mentioned polyolefin. Examples include ethylene vinyl acetate copolymer (EVA) and ethylene vinyl acetate copolymer (EVA).

2. Packaging bag 10
As shown in FIG. 3, a packaging bag 10 according to an embodiment of the present invention is constructed by forming a multilayer film 1 into a bag shape.

The packaging bag 10 includes a vertical seal portion 22 and horizontal seal portions 23 and 24. The vertical seal portion 22 is formed by curving the film 1 into a cylindrical shape so that the inner laminated film 11 is on the inner side, and with the outer layers 11e at both ends of the inner laminated film 11 overlapping each other, the overlapping portion 15 is formed at the end. It can be formed by heat sealing into a band shape except for the edges. The edge portions become peel-off portions 16 and 17 adjacent to the vertical seal portion 22. The vertical seal portion 22 can be easily peeled off by grasping and pulling the peel-off portions 16 and 17.

Note that the packaging bag 10 may be opened by tearing the vertical seal portion 22 or the horizontal seal portions 23 and 24. In this case, the tear-off parts 16 and 17 can be omitted. Further, a notch or notch may be provided in the vertical seal portion 22 or the horizontal seal portions 23 and 24 to facilitate tearing.

3. Bag-making and filling method Next, a bag-making and filling method using the film 1 will be described with reference to FIG. This method can be implemented using a bag making and filling system 100 that includes a sterilizing device 3 and a bag making and filling device 8. The bag making and filling method of this embodiment includes a sterilization process and a bag making and filling process. Each step will be explained in detail below.

3-1. Sterilization process The sterilization process can be performed using the sterilization device 8. In the sterilization process, the film 1 unrolled from the roll-shaped original fabric F is brought into contact with a sterilizer to sterilize the film 1.

Specifically, first, the film 1 unwound from the roll-shaped original fabric F is guided to the sterilizer 3 via the roller 4a. A sensor 119 is disposed along the path from the rolled material F to the sterilizer 3, and detects registration marks printed at regular intervals on the film 1 in the length direction, and adjusts the trajectory of the bag making and filling system 100. A film 1 of a fixed length can be sent out at fixed time intervals. Alternatively, a horizontal sealing machine may be disposed between the roll-shaped original fabric F and the sterilizer 3 to horizontally seal the ends of the film 1 in the longitudinal direction (the flow direction of the film 1). Thereby, it is possible to suppress the germicidal agent from entering between the inner laminated film 11 and the outer laminated film 12 from the longitudinal ends of the film 1 . On the other hand, the film 1 may be installed in the bag making and filling system 100 so that the longitudinal ends of the film 1 do not come into contact with the disinfectant. In this case, a horizontal sealing machine between the roll-shaped original fabric F and the sterilizer 3 is not necessary.

The sterilizing device 3 is a device capable of sterilizing the film 1, and may sterilize the film 1 by immersing the film 1 in a sterilizing solution 3a, which is a liquid containing a sterilizing agent. The film 1 may be sterilized by bringing the film 1 into contact with mist or gas. An example of the disinfectant is hydrogen peroxide. Inside the sterilizing device 3, the film 1 is guided by rollers 4b, 4c and moves towards the drying device 7.

By the way, in the film 1 immediately after being unwound from the roll-shaped original fabric F, the inner laminated film 11 and the outer laminated film 12 are in close contact with each other, but when the film 1 passes through the sterilizer 3, the inner laminated film The degree of adhesion between the film 11 and the outer laminated film 12 may decrease. If the degree of adhesion between the inner laminated film 11 and the outer laminated film 12 decreases, it will cause problems when forming the film 1 into a bag shape.

Therefore, in this embodiment, after the sterilization process and before the bag making and filling process, a crimping process of crimping the inner laminated film 11 and the outer laminated film 12 is performed. Specifically, this step can be performed by sandwiching the film 1 between a pair of pressure bonding members (eg, rollers) 5. By performing the crimping process, it is possible to reduce the occurrence of defects during bag making. In this embodiment, the pair of crimp members 5 are provided at two locations, but they may be provided at one location or at three or more locations.

Moreover, it is preferable to perform a drying process after the sterilization process and before the bag making and filling process. By performing this step, even if moisture or a sterilizer adheres to the film 1 during the sterilization process, it is possible to prevent unintended moisture or sterilizer from entering the packaging bag 10.

In this embodiment, the drying process is performed by a blowing device 6 and a drying device 7. The blowing device 6 blows air 6a onto the film 1 to blow away and remove water droplets on the surface of the film 1. The blowing device 6 is provided on each side of the film 1, making it possible to remove water droplets from both sides of the film 1.

The interior space 7a of the drying device 7 has a higher temperature than the outside of the drying device 7, so that the film 1 is dried while passing through the interior space 7a. The film 1 enters the interior space 7a through the inlet 7b, is guided within the interior space 7a by rollers 4d, 4e, 4f, and exits the interior space 7a through the exit 7c.

The film 1 coming out of the drying device 7 is guided to the former 112 by the roller 4g.

3-2. Bag-making and filling process The bag-making and filling process can be performed using the bag-making and filling device 8. In the bag making and filling process, the content W is filled into a cylindrical body 13 formed into a cylindrical shape with a closed bottom end by heat sealing the sterilized film 1, and then the upper end of the cylindrical body 13 is heat sealed. and seal tightly. This process will be explained in detail below.

<First step of making the film 1 into a cylinder shape>
The film 1 is curved into a cylindrical shape while passing through the former 112, and has a form in which both side edges of the curved tip are overlapped (that is, a form in which the outer layers 11e at both ends of the inner laminated film 11 are overlapped). Become. An overlapping portion 15 is formed in the overlapping portion.

<Second step of forming vertical seal portion 22>
Next, the overlapped portion 15 of the film 1 is heat-sealed using a vertical sealing machine 113 to form a vertically sealed portion 22. The vertical sealing machine 113 is equipped with a pair of seal bars, and performs heat sealing by sandwiching the overlapping portion 15 between the pair of seal bars for a predetermined period of time in synchronization with the movement of the film 1 at regular time intervals.

<Third step of forming lower horizontal seal portion 23>
Next, the openable and closable straining roll 115 is closed, and the cylindrical body 13 formed from the film 1 is squeezed. This flattens the cylindrical body 13. Then, a predetermined position of the flattened cylindrical body 13 is heat-sealed by a horizontal sealing machine 116 to form a horizontal seal portion 23. The horizontal sealing machine 116 includes a pair of seal bars, and performs heat sealing by sandwiching the above-mentioned predetermined position between the pair of seal bars for a predetermined period of time. This closes the lower end of the cylindrical body 13.

<Fourth step of filling the contents>
Next, after opening the squeezing roll 115, a predetermined amount of contents W is charged into the cylindrical body 13 using the hopper 111.

<Fifth step of forming the horizontal seal portion 24 at the top of the bag>
Next, by rotating the feed roll 114, the cylindrical body 13 and the film 1 following it are fed out by a predetermined length along with the packaging bag 10a before separation. By closing the pair of seal bars of the horizontal sealing machine 116 for a predetermined period of time and heat-sealing a predetermined position, an upper horizontal seal portion 24 is formed and the packaging bag 10 is sealed. A horizontal seal portion 23 is formed on the lower side of the next packaging bag to be placed.

<Sixth step of cutting the border line of the continuous bag>
The press/cutter 118 is closed to pinch the lower horizontal seal part 23 of the packaging bag 10a before separation and the upper horizontal seal part 24 continuous thereto, and the cutter blade 118a divides the boundary between the two into two to form the packaging bag. 10 is dropped onto the conveyor 130.

Thereby, the packaging bag 10 filled with the contents W is manufactured. Immediately after manufacturing, the inner laminated film 11 and the outer laminated film 12 that make up the packaging bag 10 are in close contact with each other. At the same time, the laminated film 12 is damaged and the contents W are likely to leak. However, with the passage of time, the content W soaks into the inner laminated film 11, so that the close contact between the inner laminated film 11 and the outer laminated film 12 is broken, and a gap is likely to be formed between them. In this state, the inner laminated film 11 and the outer laminated film 12 are unlikely to be damaged at the same time, so leakage of the contents W is suppressed.

4. Other Embodiments - The layer configurations of the multi-layered film 1 and the cylindrical layered film 2 can be changed as appropriate. In the above embodiment, the cylindrical laminated film 2 has a five-layer structure including the adhesive layer, but it may have fewer or more layers than this.

- The format in which the multi-layered film 1 is heat-sealed to form the packaging bag 10 can be changed as appropriate. In the embodiment described above, the overlapping section 15 is of a gassho-attached type, but the overlapping section 15 may be of an envelope-attached type.
- The drying process can be omitted if unnecessary. Further, the drying step may be performed using only one of the blowing device 6 and the drying device 7, or may be performed by natural drying.

1: Multiple laminated film 1a: Edge 2: Cylindrical laminated film 2a: Inner layer 2b: Adhesive layer 2c: Intermediate layer 2d: Adhesive layer 2e: Outer layer 3: Sterilizer 3a: Sterilizing liquid 4a: Roller 4b: Roller 4c: Roller 4d: Roller 4e: Roller 4f: Roller 4g: Roller 5: Pressing member 6: Blow device 6a: Air 7: Drying device 7a: Internal space 7b: Inlet 7c: Outlet 8: Bag making and filling device 10: Packaging bag 10a: Packaging Bag 11: Inner laminated film 11a: Inner layer 11b: Adhesive layer 11c: Intermediate layer 11d: Adhesive layer 11e: Outer layer 12: Outer laminated film 12a: Inner layer 12b: Adhesive layer 12c: Intermediate layer 12d: Adhesive layer 12e: Outer layer 13: Cylinder Shaped body 15 : Overlapping part 16 : Peeling part 17 : Peeling part 22 : Vertical seal part 23 : Horizontal seal part 24 : Horizontal seal part 100 : Bag making and filling system 111 : Hopper 112 : Former 113 : Vertical sealing machine 114 : Feed roll 115 : Roll 116 : Horizontal sealing machine 118 : Press and cutter 118a : Cutter blade 119 : Sensor 130 : Conveyor F : Rolled raw material W : Contents

Claims (5)

A bag making and filling method,
Equipped with a sterilization process, a drying process, a crimping process, and a bag making and filling process ,
In the sterilization step, a multi-laminated film is produced by flattening a cylindrical laminated film that does not contain a paper base material and has an adhesive layer, the multi-laminated film having an inner laminated film and an outer laminated film facing each other. sterilizing the multi-layer film by contacting the film with a sterilizing agent;
In the bag making and filling step, the sterilized multi-layered film is heat-sealed to form a cylindrical body with a closed bottom end, and the contents are filled into the cylindrical body, and then the upper end of the cylindrical body is heat-sealed. and seal it,
The drying step and the crimping step are performed after the sterilization step and before the bag making and filling step,
In the drying step, after removing droplets on the surface of the multi-layered film by blowing air, the multi-layered film is passed through a drying device having an internal space that is hotter than the outside,
The crimping process includes a first crimping process and a second crimping process,
The first compression bonding step is performed before the drying step,
In the first crimping step, the inner laminate film and the outer laminate film are crimped by sandwiching the multiple laminate film between a first pair of crimping members ,
In the second pressure bonding step, the inner laminated film and the outer laminated film are pressure bonded by sandwiching the multiple laminated film between a second pair of pressure bonding members disposed inside the drying device. The method according to claim 1,
Each of the inner laminated film and the outer laminated film includes an inner layer containing an additive and an outer layer not containing the additive,
Of the multiple laminated films constituting the cylindrical body, the outer layer of the outer laminated film is located at the outermost surface of the cylindrical body, and the outer layer of the inner laminated film is in contact with the contents. ,Method. The method according to claim 1 or claim 2,
The sterilizing agent is a sterilizing liquid,
The sterilization step is performed by immersing the multilayer film in the sterilization solution. A bag making and filling system,
A sterilizing device, a drying device, a blowing device, a bag making and filling device, a first pair of crimping members, and a second pair of crimping members,
The sterilizer is a multi-laminated film that is formed by flattening a cylindrical laminated film that does not contain a paper base material and has an adhesive layer, and that has an inner laminated film and an outer laminated film that face each other. sterilizing the multi-layer film by contacting the film with a sterilizing agent;
The first pair of pressure bonding members are arranged between the sterilization device and the blowing device, and pressure bond the inner laminated film and the outer laminated film by sandwiching the sterilized multi-layered film. death,
The blowing device is disposed between the sterilizing device and the drying device, and blows and removes droplets on the surface of the multi-laminated film by blowing air onto the multi-laminated film,
In the drying device, the surface of the multi-layered film is dried by passing the sterilized multi-layered film through an internal space that is higher temperature than the outside,
The second pair of pressure bonding members are disposed inside the drying device, and pressure bond the inner laminated film and the outer laminated film by sandwiching the sterilized multi-layered film,
In the bag making and filling apparatus, after filling the contents into a cylindrical body formed into a cylindrical body with a closed bottom end by heat-sealing the multiple laminated film that has passed through the second pair of pressure bonding members, A system that seals the upper end of a shaped body by heat sealing it. The bag making and filling system according to claim 4 ,
Each of the inner laminated film and the outer laminated film includes an inner layer containing an additive and an outer layer not containing the additive,
Of the multiple laminated films constituting the cylindrical body, the outer layer of the outer laminated film is located at the outermost surface of the cylindrical body, and the outer layer of the inner laminated film is in contact with the contents. ,system.