JPH02233368A - Manufacturing method for degassing packaging bags - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Application in Industry] The present invention relates to a method for producing a gas-venting packaging bag for containing contents that generate gas during storage, particularly powdered materials such as powdered coffee. .

[Conventional technology]

Conventionally, when storing contents such as coffee beans that generate a small amount of gas during storage in a packaging bag, a small hole or notch is formed in the wall of the packaging bag to allow the residue to escape. A degassing packaging bag with a degassing valve attached to the outer surface of the wall has been used, and various types of degassing valves have been proposed for use in such degassing packaging bags. Publication No. 56-32244, No. 605
Publication No. 7069, Publication No. 63-6278, Publication No. 63-6
279, etc.). These degassing packaging bags are made by sequentially forming small holes and notches and degassing valves using a perforation device and a valve attachment device in a packaging bag made of plastic sheet or the like. Manufactured.

[Problem to be solved by the invention]

However, conventional degassing packaging bags of this type do not cause any problems if the contents are relatively large particles, but if they contain powdered substances such as powdered coffee, There is a problem in that the gas flows into the gas venting valve through the small hole or notch, impairing the valve function of the waste removing valve.

In addition, for the purpose of preventing powdery substances from flowing into the gas vent valve, small holes or notches are covered on the outer surface of the wall of the packaging bag to create an internal communication space made of woven fabric, non-woven fabric, or synthetic resin foam. It is also conceivable to install a gas venting member on the outer surface of the wall covering the breathable member, but in manufacturing such a gas venting packaging bag, it is necessary to The operation of attaching the breathable member and gas venting valve to the bag is carried out on the same line.For this reason, it is difficult to use the conventional valve attachment device as is, and it is difficult to use the conventional valve attachment device as is. It is difficult to efficiently manufacture degassing packaging bags at low cost, such as the need to add some kind of equipment.

The present invention has been made to improve the above-mentioned situation, and even when fine powder such as powdered coffee is stored, such powder is prevented from entering the gas venting valve, and the valve function effectively. To provide a method for efficiently manufacturing, at low cost, a degassing packaging bag that allows waste generated from powdery materials to escape to the outside during storage, using conventional street pick-up equipment as is. The purpose is to

[Means and effects for solving the problems] In order to achieve the above object, the present invention provides a sheet body having a heat-adhesive resin layer on one side, a small hole or a notch that communicates the inside and outside of the sheet body. A breathable member made of woven fabric, non-woven fabric, or foam having an internal communication space formed of a heat-adhesive resin is inserted into the heat-adhesive resin layer of the sheet body to form the small holes or notches. After covering and thermally bonding, this sheet body is used to form a packaging bag in which the above-mentioned breathable member is present on the inner surface of the wall, and
By attaching a gas venting valve to the outer surface of the wall of the packaging bag, covering the small hole or notch, when contents that generate gas during storage are stored inside, this gas can be removed from the above-mentioned vent. A gas venting packaging bag is provided in which the gas flows into the venting valve through the internal communication space of the sex member through the small hole or notch, and then escapes to the outside from the gas discharge part of the venting valve. The present invention provides a method for manufacturing a degassing packaging bag characterized by obtaining the following.

The degassing packaging bag obtained by the present invention has an air permeable member having an internal communication space provided on the inner surface of the wall of the packaging bag by covering the small ventilation holes or notches, and the above-mentioned small holes on the outer surface of the wall. A gas venting valve is attached to cover the hole or notch, so when powder is stored inside the packaging bag, the powder will flow inside the small hole or notch and meet the breathability requirements in Section 2. Being trapped in the member prevents powder from flowing into the degassing valve through the small holes or notches, so that the valve function of the degassing valve always works well.

In addition, in the present invention, after forming small holes or notches in the sheet body and arranging a breathable member before bag making, a packaging bag is created using the sheet body 1, Since a gas venting valve is attached to this packaging bag, unlike attaching a breathable member and a gas venting valve to a manufactured packaging bag, the current valve attachment device can be used as is to attach the packaging bag. Valve installation work can be done efficiently and at low cost. Furthermore, in this case, a sheet body having a heat-adhesive resin layer on one side is used, and a material made of a heat-adhesive resin is used as the breathable member, and the heat-adhesive resin layer of the sheet body is provided with a breathable member. Since it is thermally bonded, the breathable member can be efficiently attached to the body.

Hereinafter, the present invention will be explained in more detail with reference to the drawings.

In the present invention, first, as shown in FIG. 1, a suitable device is used at a predetermined location of a sheet body 2 having a heat-adhesive resin layer 1 on at least one surface thereof, to form a small hole that communicates the inside and outside of the body 2 with the sheet body 1. A hole or notch 3 (the drawing shows a small hole) is formed, and a breathable member 4 is thermally bonded to the heat-adhesive resin layer 1 so as to cover the small hole or notch 3 . In this case, examples of the heat-adhesive resin forming the heat-adhesive resin layer 1 include polyethylene, EVA, polypropylene, and the like.

Further, the self-breathable member 4 is made of a woven fabric, non-woven fabric, or foam having a three-dimensional internal communication space formed of the same thermoadhesive resin, and the mesh of the breathable member 3 is Various types are selected depending on the particle size of the powder to be filled into the packaging bag, but it is usually formed smaller than the particle size of the powder, and its thickness is also selected as appropriate, but it is usually 0.2 to 2.
111.

Here, although there is no limitation on the means for disposing the breathable member 4,
It is particularly preferable to employ the method described below. That is, as shown in FIG. 2, first, a long tape S made of woven fabric, nonwoven fabric, or foam having an internal communication space formed of a thermoadhesive resin is provided with cutouts 6, 6 facing each other. By punching with a substantially cylindrical punching blade 7, a pair of opposing substantially semicircular cutting lines 8a and 8b are punched in the tape 5, with both ends slightly spaced apart, as shown in FIG. As a result, the connecting portions 9, 9 provided by the remaining portions of the tape 5 and the notches 6, 6 are formed inwardly of the cutting lines 8a, 81).
A large number of circular air-permeable members 4 connected through the tape 5 are continuously formed along the length direction of the tape 5. Next, as shown in FIG. 4, the sheet body 2 and the tape 5 are made to travel in one direction at a predetermined speed, and a ventilation hole is formed in the tape 5 using a cylindrical heat seal plate 10. The vicinity of the outer periphery of the flexible member 4 is sequentially heat-sealed to the heat-adhesive resin layer 1 of the seam body 2, covering the small holes or cut portions 3, thereby causing the connecting portions 9, 9 to break. A circular air permeable member 4 is continuously fixed onto the thermoadhesive resin layer 1. According to this means, the breathable parts 4 can be arranged continuously and efficiently on the seam 1 and the body 2. In addition, in FIGS. 2 to 4, the air permeable portion 44 is circular, but it may have another shape. Further, the aspect of the connecting portion 9 may be changed as appropriate.

In the present invention, next, a packaging bag in which the breathable member 4 is present on the inner surface of the wall is made using the sheet body 2 on which the above-mentioned breathable member 4 is arranged, and the wall of this packaging bag is 8. 2. Attach a gas vent valve to cover the small hole or notch 3.

In this case, as the gas venting valve, the above-mentioned publications, namely, JP-A-56-32244, JP-A-60-57069, JP-A-63-6278, JP-A-63-6279, and Japanese Patent Application Laid-Open No. 63-63- No. 103364, a valve body is arranged between a base film in which a through hole is formed at a location facing the air permeable member and a cover that covers the base film so as to close the through hole. It is possible to use an interposed one, or one in which the base film is omitted in these gas venting valves.

Next, the present invention will be concretely illustrated by examples, but the present invention is not limited to the following examples.

〔Example〕

FIG. 5 shows an example of a degassing packaging bag manufactured by the method of the present invention. This packaging bag 11 is made using the sheet body 2 shown in FIG. A valve 13 is fixed to each valve, and a powdered substance such as powdered coffee is housed inside. In this case, the degassing packaging bag 11 is produced by disposing the air permeable member 4 on the sheath 1 and body 2 by the means shown in FIGS. It is manufactured by encasing it in a bag and further attaching a gas venting valve 13.

Here, the gas venting valve ↑3 has a through hole 14 in the center.
A base film 15 made of a plastic film with perforations, a valve body 16 made of a flexible plastic film folded in half and one end thereof extending, and a cover made of a plastic film. 17
One end edge of the base film 15 and one end edge of the cover unit 17 are thermally bonded together with the extended end edge of the valve body 16 sandwiched between them, and By thermally bonding the other edge of the film 15 and the other edge of the cover cover 17 together, the base film 15
A valve body 16 is interposed between the cover body 17 and the valve body 1.
The free end side of the base film 15 is biased to press the bulge film 15, and the through hole 14 of the base film 15 is normally closed by the pressing force of the valve 16. This degassing valve 13 is disposed so that the through hole 14 of the base film 15 faces the small hole or notch 3, and the packaging bag 11
is attached by adhesive. In addition, inside the gas venting valve 13 (inside the hollow part 18), external air and the packaging bag 1
1 is filled with a liquid sealant such as silicone oil.

In the degassing packaging bag 11 shown in FIG. 5, when gas is generated from the powder contained therein and the internal pressure increases, the gas passes through the internal communication space of the breathable member 4 through the small holes or notches. 3, further pushes up the valve body 16 through the through hole 14 of the base film 15, forms a gap between the valve body 16 and the base film 115, and escapes to the outside from the open end of the valve body 16. . Then, when the high pressure inside the packaging bag 11 is eliminated by the gas escaping to the flap part, the pressing force of the gas against the valve body 16 is released, and the valve body 16 is elastically restored and the valve body 16 As a result, the through hole 14 of the base film 15 returns to its original state where it is closed. Therefore, the outside air is
4 into the packaging bag ]-1 is blocked. Further, in this case, the powder inside the packaging bag 1 is captured by the breathable member 4.

Therefore, according to the degassing packaging bag ↓1 of this embodiment, since the breathable part 4 is arranged on the inner surface of the wall part 12, powdery substances do not enter into the degassing valve 13, so that the above-mentioned The valve function is not impaired, and good valve function is stably exhibited. Furthermore, according to the manufacturing method of this embodiment, since the breathable member 4 is thermally bonded to the sheet body 2 by the method shown in FIGS. 2 to 4, the arrangement of the breathable member 4 is continuous. It can be carried out efficiently, and the breathable member 4 is attached to the body 2 to the sea 1.
The packaging bag is made after being thermally bonded, and the gas venting valve 13 is attached to the packaging bag. Therefore, the gas venting valve 13 can be attached using the conventional valve mounting device as is. It is possible.

In the present invention, the configuration of the degassing valve is not limited to the illustrated embodiment, and other configurations may be modified within the scope of the present invention.

〔Effect of the invention〕

As explained above, according to the present invention, even if a powdery substance such as powdered coffee is stored as a content, this powdery substance does not enter the gas venting valve. It is possible to obtain a degassing packaging bag that stably exhibits its valve function. Further, according to the present invention, the breathable member made of a heat-adhesive resin is thermally bonded to the sheet body having a heat-adhesive resin layer on one surface, so that the arrangement of the breathable member on the sheet body 1 is easy. This can be done easily, and since the gas venting valve is attached to the packaging bag after the packaging bag is manufactured using this sheet, the conventional valve attachment device can be used as is. Therefore, a highly functional degassing packaging bag as described above can be manufactured efficiently and at low cost.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing a state in which a breathable member is arranged on a sheet body with small holes or notches formed therein, and Fig. 2 is a cross-sectional view showing a state in which a breathable member is arranged on a sheet body with small holes or notches formed therein. 3 is a cross-sectional view showing a state in which a breathable member is formed on the tape; FIG. 3 is a plan view showing the tape punched with the punching knife of FIG. 2;
Fig. 4 is a sectional view showing the state in which the breathable part 4 is thermally bonded to the sheet 1 and body using the tape shown in Fig. 3, and Fig. 5 shows an example of a degassing packaging bag manufactured by the method of the present invention. FIG.

Claims (1)

[Claims] 1. A woven fabric in which a sheet body having a thermoadhesive resin layer on one side has small holes or notches communicating between the inside and outside of the sheet body, and an internal communication space formed by the thermoadhesive resin;
After thermally adhering a breathable member made of nonwoven fabric or foam to the heat-adhesive resin layer of the sheet body, covering the small holes or notches, the sheet body is used to attach the breathable member to the inner surface of the wall. In addition to manufacturing existing packaging bags, a gas release valve is attached to the outer surface of the wall of the packaging bag to cover the small holes or notches, so that the contents that generate gas during storage can be accommodated inside. Sometimes, this gas flows into the gas venting valve through the small hole or cut through the internal communication space of the breathable member, and then escapes to the outside from the gas discharge part of the gas venting valve. A method for producing a degassing packaging bag, characterized by obtaining a degassing packaging bag.