CN114555478A

CN114555478A - Bag making and filling method and bag making and filling system

Info

Publication number: CN114555478A
Application number: CN202080073168.9A
Authority: CN
Inventors: 上杉知宏
Original assignee: Kyoraku Co Ltd
Current assignee: Kyoraku Co Ltd
Priority date: 2019-11-29
Filing date: 2020-11-24
Publication date: 2022-05-27
Anticipated expiration: 2040-11-24
Also published as: JP2021084678A; CN114555478B; WO2021106863A1; JP7381862B2

Abstract

Provided is a bag-making and filling method capable of suppressing peeling of a laminated film. According to the present invention, there is provided a bag making and filling method including a sterilization step of sterilizing a multilayer laminated film formed by flattening a cylindrical laminated film having an adhesive layer by bringing the multilayer laminated film into contact with a sterilizing agent, and a bag making and filling step of filling a content into a cylindrical body formed by heat-sealing the sterilized multilayer laminated film into a cylindrical shape having a closed lower end, and then heat-sealing and sealing an upper end of the cylindrical body.

Description

Bag-making and filling method and bag-making and filling system

Technical Field

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

Background

Patent document 1 discloses a method in which a laminated film having an adhesive layer is brought into contact with a disinfectant comprising hydrogen peroxide to sterilize the laminated film, and then the laminated film is filled to form a bag.

Documents of the prior art

Patent document

Patent document 1: japanese laid-open patent publication No. 2015-81142

Disclosure of Invention

(problems to be solved by the invention)

In the method of patent document 1, when the adhesive layer of the laminated film comes into contact with the bactericide, the laminated film may peel off.

The present invention has been made in view of the above circumstances, and provides a bag-making and filling method capable of suppressing peeling of a laminated film.

(means for solving the problems)

According to the present invention, there is provided a bag making and filling method including a sterilization step of sterilizing a multilayer laminated film formed by flattening a cylindrical laminated film having an adhesive layer by bringing the multilayer laminated film into contact with a sterilizing agent, and a bag making and filling step of filling a content into a cylindrical body formed by heat-sealing the sterilized multilayer laminated film into a cylindrical shape having a closed lower end and then heat-sealing an upper end of the cylindrical body.

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

Various embodiments of the present invention are exemplified below. The embodiments shown below can be combined with each other.

In the above method, the sterilization agent is a sterilization liquid, and the sterilization step is performed by immersing the multilayer laminated film in the sterilization liquid.

In the above method, the multilayer laminated film preferably includes an inner laminated film and an outer laminated film that face each other, and the method further includes a press-fitting step of press-fitting the inner laminated film and the outer laminated film after the sterilization step and before the bag-making and filling step.

Preferably, the bag-making and filling system includes a sterilization apparatus for sterilizing a cylindrical laminated film having an adhesive layer by bringing a multi-layered laminated film, which is formed by flattening the laminated film, into contact with a sterilizing agent, and a bag-making and filling apparatus for filling a content into a cylindrical body, which is formed by heat-sealing the sterilized multi-layered laminated film into a cylindrical shape with a closed lower end, and then heat-sealing and sealing an upper end of the cylindrical body.

Drawings

In fig. 1, fig. 1A is a diagram showing a layer structure of the cylindrical laminated film 2, and fig. 1B is an enlarged view of a region B in fig. 1A.

In fig. 2, fig. 2A is a view showing a layer structure of the multilayer laminated film 1, and fig. 2B is an enlarged view of a region B in fig. 2A.

In fig. 3, fig. 3A is a perspective view of the packaging bag 10, and fig. 3B is a sectional view of the vicinity of the vertical seal portion 22.

Fig. 4 is an explanatory diagram for explaining the bag-making and filling method.

Detailed Description

Embodiments of the present invention will be described below. Various feature items shown in the embodiments shown below may be combined with each other. In addition, each feature may independently constitute the invention.

1. Multilayer laminated film 1

As shown in fig. 1 to 2, the multilayer laminated film 1 is configured by flattening a cylindrical laminated film 2. 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 2 e. The inner layer 2a, the intermediate layer 2c, and the outer layer 2e are bonded to each other by

adhesive layers

2b and 2 d.

As shown in fig. 2, the multilayer laminated film 1 includes an inner laminated film 11 and an outer laminated film 12 facing each other. The inner laminate film 11 and the outer laminate film 12 are provided with layers 11a to 11e and 12a to 12e derived from the layers 2a to 2e, respectively. The inner layer 11a, the intermediate layer 11c, and the outer layer 11e are bonded to each other by

adhesive layers

11b and 11 d. The inner layer 12a, the intermediate layer 12c, and the outer layer 12e are bonded to each other by

adhesive layers

12b and 12 d.

The inner laminate film 11 and the outer laminate film 12 are connected to each other at the end edge 1a in the width direction. Therefore, the

adhesive layers

11b, 12b, 11d, and 12d (hereinafter referred to as the adhesive layer 11b and the like) are not exposed at the end edge 1a of the multilayer laminated film 1 in the width direction, and the adhesive layer 11b and the like do not come into contact with the bactericide in a later-described sterilization process, and therefore peeling of the laminated

films

11 and 12 constituting the multilayer laminated film 1 by the bactericide can be suppressed. In addition, if the adhesive layer is exposed at the edge in the width direction as in patent document 1, the bactericide enters the interlayer from the edge, and this embodiment does not have such a risk. In the structure of patent document 1, a special adhesive having particularly high adhesive strength may be used in order to prevent peeling of the laminated film, but if such an adhesive is used, the flexibility of the laminated film is reduced, and the laminated film becomes hard. When the packaging bag 10 (see fig. 3) is manufactured by bag-making, filling and using such a laminated film, the packaging bag 10 is easily bent, and the packaging bag 10 is easily broken at the bent portion. On the other hand, in the present embodiment, since the adhesive layer 11b and the like do not come into contact with the bactericide, it is not necessary to use a special adhesive to suppress the occurrence of breakage of the packaging bag 10.

In one example, the multilayer laminated film 1 may be formed by: the cylindrical parison formed by the coextrusion molding is expanded (i.e., by inflation molding) to form a cylindrical laminated film 2, and the cylindrical laminated film 2 is flattened to be flattened. The cylindrical laminated film 2 can be flattened by sandwiching it with a pair of nip members (e.g., rollers), for example. This makes it possible to obtain a multilayer laminated film 1 comprising an inner laminated film 11 and an outer laminated film 12 connected to each other at the end edge 1 a. Since the

films

11, 12 are pressed against each other using a pair of pressing members, the

inner layers

11a, 12a of the

films

11, 12 are adhered (pseudo-bonded) to each other. In fig. 2, the

inner layers

11a and 12a are shown separated for convenience of illustration. The multilayer laminated film 1 is wound into a roll to form a roll F shown in fig. 4. In the bag-making and filling method using the multilayer laminated film 1, the multilayer laminated film 1 is preferably supplied by unwinding a roll-like material F. The thickness of the multilayer laminated 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 a 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, and propylene-ethylene copolymers, polyamide or copolyamide resins having a low melting point or a low softening point, polyester or copolyester resins, and polycarbonate resins.

When the

inner layers

11a and 12a have heat sealability, when the multilayer laminated film 1 is heat-sealed to form the multilayer laminated film 1 into a bag shape, the

inner layers

11a and 12a are fused at the heat-sealed portions (the vertical seal portion 22 and the

horizontal seal portions

23 and 24 in fig. 2), and the rigidity of the heat-sealed portions is improved. The

inner layers

11a, 12a may be omitted if fusing of the

inner layers

11a, 12a is not required.

When the multilayer laminated film 1 is used for bag-making and filling, the

inner layers

11a and 12a do not contact with the contents, and the outer layer 11e of the inner laminated film 11 contacts with the contents. Therefore, in order to suppress the entry of the additive into the contents, the material constituting the outer layer 11e preferably contains no additive. Particularly, when the content is a target of "a relevant guideline such as a milk or a dairy product, a component standard, etc., of milk", the technical meaning of making the material constituting the outer layer 11e contain no additive is particularly significant. On the other hand, for the purpose of improving flexibility of the multilayer laminated film 1, an additive such as a softening agent may be added to the

inner layers

11a and 12 a.

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, 12 e. At this time, heat sealing can be stably performed by performing heat sealing at a temperature at which the

inner layers

11a, 12a and the

outer layers

11e, 12e melt but the

intermediate layers

11c, 12c do not melt. Examples of such a material include polyamide-containing resins. The constituent resin of the

intermediate layers

11c, 12c may be only polyamide, or may contain another resin. As the other resin, a resin that increases the rigidity of the

intermediate layers

11c, 12c is preferable. The content of the polyamide is preferably 50% by mass or more with respect to the total resin constituting the

intermediate layers

11c, 12 c. Specifically, the content is, for example, 50, 60, 70, 80, 90, or 100 mass%, and may be in a range of any 2 values exemplified herein.

The adhesive layer 11b and the like are preferably made of an adhesive material, and examples of the adhesive material include an acid-modified polyolefin (for example, maleic anhydride-modified polyethylene) in which a carboxyl group is introduced into the polyolefin, 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 configured by forming a multilayer laminated film 1 into a bag shape.

The packaging bag 10 includes a vertical seal portion 22 and

horizontal seal portions

23 and 24. The longitudinal seal portion 22 may be formed by: the film 1 is bent into a cylindrical shape so that the inner laminated film 11 is on the inner surface side, the outer layers 11e at both ends of the inner laminated film 11 are overlapped with each other, and the overlapped portion 15 is heat-sealed into a belt shape in this state except for the end edge portion. The end edge portions are formed as peeling

portions

16, 17 adjacent to the vertical seal portion 22. By grasping and pulling the peeling

sections

16 and 17, the vertical seal section 22 can be easily peeled.

The packaging bag 10 may be opened by cutting the vertical seal portion 22 or the

horizontal seal portions

23 and 24. In this case, the peeling

portions

16, 17 may be omitted. Further, the vertical seal portion 22 or the

horizontal seal portions

23 and 24 may be provided with a cut or a notch to facilitate cutting.

3. Bag making and filling method

Next, a bag-making and filling method using the film 1 will be described with reference to fig. 4. The method can be implemented using a bag-making and filling system 100 provided with a sterilizing apparatus 3 and a bag-making and filling apparatus 8. The bag-making and filling method of the present embodiment includes a sterilization step and a bag-making and filling step. The respective steps will be described in detail below.

3-1. Sterilization step

The sterilization process may be performed using the sterilization apparatus 8. In the sterilization step, the film 1 discharged from the roll F is sterilized by bringing the film 1 into contact with a sterilizing agent.

Specifically, the film 1 discharged from the roll F is guided to the sterilizer 3 via the roller 4 a. A sensor 119 is disposed on the way from the roll F to the sterilizing apparatus 3, and detects a regular line printed at a constant interval in the longitudinal direction on the film 1, and feeds the film 1 of a constant length onto the track of the bag-making and filling system 100 at a constant time interval. Further, a transverse sealing machine may be disposed between the roll F and the sterilizing apparatus 3 to seal the longitudinal end of the film 1 (the flow direction of the film 1) in the transverse direction. This can prevent the bactericide from entering between the inner laminated film 11 and the outer laminated film 12 from the end in the longitudinal direction of the film 1. On the other hand, film 1 may be provided in bag-making and filling system 100 so that the longitudinal end of film 1 does not come into contact with the bactericide. In this case, a transverse sealer between the web F and the sterilizing device 3 is not required.

The sterilization apparatus 3 is an apparatus capable of sterilizing the film 1, and may sterilize the film 1 by immersing the film 1 in a sterilization liquid 3a that is a liquid containing a sterilization agent, or may sterilize the film 1 by bringing the film 1 into contact with mist or gas of the sterilization agent. As the bactericide, hydrogen peroxide can be exemplified. In the sterilizer 3, the film 1 is guided by the

rollers

4b and 4c and moved to the drying device 7.

Further, the film 1 just discharged from the roll F is in a state where the inner laminated film 11 and the outer laminated film 12 are in close contact with each other, and when the film 1 passes through the sterilizer 3, the degree of contact between the inner laminated film 11 and the outer laminated film 12 may be reduced. If the degree of adhesion between the inner laminated film 11 and the outer laminated film 12 is reduced, a problem may occur when the film 1 is formed into a bag shape.

Therefore, in the present embodiment, the press-fitting step of press-fitting the inner laminated film 11 and the outer laminated film 12 is performed after the sterilization step and before the bag-making and filling step. This process can be specifically performed by sandwiching the film 1 with a pair of nip members (e.g., rollers) 5. By performing the press-fitting process, it is possible to suppress the occurrence of defective products in the dispensing process. In the present embodiment, the pair of caulking members 5 are provided at 2 positions, but may be provided at 1 or 3 or more positions.

Further, it is preferable to perform a drying step after the sterilization step and before the bag-making and filling step. By performing this step, even if moisture or a bactericide adheres to the film 1 in the sterilization step, the moisture or the bactericide can be prevented from being mixed into the packaging bag 10.

In the present embodiment, the drying process is performed by using the air blowing device 6 and the drying device 7. The air blowing device 6 blows air 6a to the film 1 to blow off water droplets on the surface of the film 1. The air blowing devices 6 are respectively arranged at two sides of the membrane 1 and can remove water drops on two sides of the membrane 1.

The temperature of the inner space 7a of the drying device 7 is higher than the outside of the drying device 7, and the film 1 is dried while passing through the inner space 7 a. The film 1 enters the internal space 7a through the inlet 7b, is guided by the

rollers

4d, 4e, 4f in the internal space 7a, and is discharged from the internal space 7a through the outlet 7 c.

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

3-2 bag making and filling process

The bag-making and filling process may be performed using the bag-making and filling apparatus 8. In the bag-making and filling step, the content W is filled into the tubular body 13 formed into a tubular shape with the lower end closed by heat-sealing the sterilized film 1, and then the upper end of the tubular body 13 is heat-sealed and sealed. This step is described in detail below.

< step 1: making the film 1 into a roll shape >

The film 1 is bent into a cylindrical shape while passing through the former 112, and the both side edge portions of the bent front end are overlapped (that is, the outer layers 11e at both ends of the inner laminated film 11 are overlapped with each other). The overlapped portion 15 is formed at the overlapped portion.

< 2 nd step: formation of vertical seal part 22>

Next, the overlapped portion 15 of the film 1 is heat sealed by the vertical sealer 113 to form a vertical seal portion 22. The vertical sealer 113 includes a pair of sealing bars, and heat-seals the overlapping portion 15 between the pair of sealing bars at a predetermined timing in accordance with timing at which the film 1 moves at a predetermined time interval.

< step 3: formation of the lower side transverse seal portion 23>

Next, the ironing roll 115 which can be opened and closed is closed, and the tubular body 13 formed of the film 1 is ironed. The cylindrical body 13 is thereby flattened. Then, the predetermined position of the flattened tubular body 13 is heat sealed by the transverse sealer 116 to form the transverse seal portion 23. The transverse sealing machine 116 includes a pair of sealing bars, and heat-seals the predetermined position for a predetermined time by sandwiching the predetermined position between the pair of sealing bars. Thereby, the lower end of the cylindrical body 13 is closed.

< step 4: filling content >

Next, after the ironing roll 115 is opened, a predetermined amount of the content W is charged into the cylindrical body 13 through the hopper 111.

< step 5: transverse seal 24 forming the upper part of the bag

Next, the tubular body 13 and the film 1 following it are discharged by a predetermined length together with the packaging bag 10a before separation by rotating the conveying roller 114. The pair of sealing bars of the transverse sealer 116 is closed for a predetermined time and heat-sealed at a predetermined position to form the upper transverse seal 24 to seal the packaging bag 10, while the next packaging bag connected thereto upstream on the rail forms the lower transverse seal 23.

< step 6: cutting the boundary line of the continuous pouch >

The press cutter 118 is closed, the lower side horizontal seal portion 23 of the packaging bag 10a before separation and the upper side horizontal seal portion 24 connected thereto are pinched and divided into two by the cutting blade 118a, and the packaging bag 10 is dropped from the conveyor 130.

Thereby manufacturing the packaging bag 10 filled with the content W. When the inner laminate film 11 and the outer laminate film 12 constituting the packaging bag 10 are in a tightly sealed state immediately after the production, if a strong impact is applied to the packaging bag 10 in this state, the inner laminate film 11 and the outer laminate film 12 are simultaneously damaged, and the content W is likely to leak. However, as time passes, the content W penetrates into the inner laminated film 11, and the adhesion between the inner laminated film 11 and the outer laminated film 12 is released, so that a gap is likely to be formed therebetween. In this state, the inner laminated film 11 and the outer laminated film 12 are less likely to be damaged at the same time, and therefore leakage of the content W can be suppressed.

4. Other embodiments

The layer configurations of the multilayer laminated film 1 and the cylindrical laminated film 2 may be changed as appropriate. In the above embodiment, the cylindrical laminated film 2 is composed of 5 layers including the adhesive layer, but the number of layers may be more or less than 5.

The form of the packaging bag 10 formed by heat-sealing the multilayer laminated film 1 may be changed as appropriate. In the above embodiment, the overlapping portion 15 is of a palm-fit attaching type, but the overlapping portion 15 may be of a sleeve-sealing attaching type.

The drying step may be omitted if not required. The drying step may be performed by using only one of the air blowing device 6 and the drying device 7, or may be performed by natural drying.

(description of reference numerals)

1: multilayer laminated film, 1 a: end edge, 2: cylindrical laminated film, 2 a: inner layer, 2 b: adhesive layer, 2 c: intermediate layer, 2 d: adhesive layer, 2 e: outer layer, 3: sterilization apparatus, 3 a: sterilizing liquid, 4 a: roller, 4 b: roller, 4 c: roller, 4 d: roller, 4 e: roller, 4 f: roller, 4 g: roller, 5: pressing members, 6: blowing device, 6 a: air, 7: drying device, 7 a: inner space, 7 b: inlet, 7 c: outlet, 8: bag-making and filling apparatus, 10: packaging bag, 10 a: packaging bag, 11: inner laminated film, 11 a: inner layer, 11 b: adhesive layer, 11 c: intermediate layer, 11 d: adhesive layer, 11 e: outer layer, 12: outer laminated film, 12 a: inner layer, 12 b: adhesive layer, 12 c: intermediate layer, 12 d: adhesive layer, 12 e: outer layer, 13: cylindrical body, 15: overlapping section, 16: peeling section, 17: peeling section, 22: longitudinal seal portion, 23: lateral seal portion, 24: lateral seal portion, 100: bag-making and filling system, 111: hopper, 112: former, 113: longitudinal sealer, 114: conveying roller, 115: ironing roll, 116: cross sealer, 118: press cutter, 118 a: cutting edge, 119: sensor, 130: conveyor belt, F: roll-shaped material, W: and (4) the contents.

Claims

1. A bag-making and filling method comprising a sterilization step and a bag-making and filling step,

in the sterilization step, a multi-layer laminated film formed by flattening a cylindrical laminated film having an adhesive layer is brought into contact with a sterilization agent to sterilize the multi-layer laminated film,

in the bag-making and filling step, after contents are filled into a cylindrical body formed by heat-sealing the sterilized multilayer laminated film into a closed lower end, the upper end of the cylindrical body is heat-sealed and sealed.

2. The method of claim 1, wherein,

the bactericide is a sterilizing liquid, and the sterilizing liquid is a sterilizing liquid,

the sterilization step is performed by immersing the multilayer laminated film in the sterilization liquid.

3. The method of claim 1 or 2,

the multilayer laminated film comprises an inner laminated film and an outer laminated film which are opposite to each other,

the method further includes a press-fitting step of press-fitting the inner laminated film and the outer laminated film after the sterilization step and before the bag-making and filling step.

4. A bag-making and filling system is provided with a sterilizing device and a bag-making and filling device,

in the sterilization device, a multi-layer laminated film formed by flattening a cylindrical laminated film with an adhesive layer is contacted with a sterilization agent to sterilize the multi-layer laminated film,

in the bag-making and filling apparatus, after filling contents into a cylindrical body formed by heat-sealing the sterilized multilayer laminated film into a closed lower end, the upper end of the cylindrical body is heat-sealed and sealed.