JPH07246670A - Production of bag with chuck - Google Patents

Abstract

PURPOSE:To produce a bag with a chuck excellent in air tightness even at the chuck end part thereof and suitable for a vacuum packaging use, for example, a compressed futon bag. CONSTITUTION:In producing a plastic film bag 1 with a chuck, the heat sealing in the vicinity of chuck end parts 121 is performed so that first point seal is applied to a plastic film 2 at the parts approaching a chuck 12 while avoiding the chuck 12 and second point seal is subsequently applied to the parts including the chuck end parts 121 so as to overlap with the first point seal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a bag with a zipper having an excellent sealing property, particularly a bag with a zipper for vacuum packaging and a bag with a zipper for a compressed futon bag.

[0002]

2. Description of the Related Art A bag with a zipper has a rapidly increasing amount because its opening can be easily resealed and the bag can be repeatedly used. Utilizing these characteristics, after storing bulky items such as futons and clothes, the air in the bag is sucked and removed to store these items compactly. Is also being used in the field of.

When such a bag with a zipper is used in a vacuum packaging application such as a liquid container or the above-mentioned compressed futon bag, it is required that the zipper portion and the plastic film have excellent airtightness. There is. Therefore, when manufacturing a bag with a zipper used for such applications, the plastic film to be used should be a plastic film with excellent gas barrier properties, or the airtightness should be improved by devising the shape of the zipper or using multiple zipper. It was being granted.

However, since the chuck used for the bag with the chuck has a structure in which the male claw portion and the female claw portion which face each other are fitted together, a gap due to improper fitting is inevitably formed near both ends of the chuck. However, there is a problem in that the airtightness of that portion is deteriorated. Also, in order to solve this problem, a method of heat-sealing the chuck end is also adopted, but the thickness of the plastic film used for the base material and the male and female nails is greatly different,
It was difficult to form an airtight heat seal because a step was easily formed between them during heat sealing. This tendency was particularly strong in the case of a large bag such as a compressed futon bag.

[0005]

DISCLOSURE OF THE INVENTION The present invention has excellent airtightness even at the chuck end portion of a bag with a chuck, and a method for producing a bag with a chuck suitable for vacuum packaging applications, for example, as a compressed futon bag, particularly a chuck end. It is an object of the present invention to provide a heat sealing method for the vicinity of a part.

[0006]

According to the present invention, in a method of manufacturing a zipper bag made of a plastic film, the heat seal near the chuck end is close to the chuck while avoiding the first point seal from the chuck. And a second point seal including a chuck end portion, and a second point seal is applied so as to overlap the first point seal. The method for producing a bag with a zipper according to claim 1, wherein the contact surface of the hot plate used for the first point seal has a shape having a plurality of grooves. There is provided a method for manufacturing the zipper-equipped bag, which is a film. There is provided a method for producing the bag with a chuck, which is a bag with a chuck having, further, a method for producing the bag with a chuck for vacuum packaging is provided. A manufacturing method is provided.

The present invention will be described below in detail with reference to the drawings. The zipper bag 1 obtained by the present invention is made of a plastic film 2, and it is essential that the zipper bag 1 has a zipper 12 near the opening 11. Here, the plastic film 2 can be used without particular limitation as long as it can be heat-sealed, but it is preferable that it has a gas barrier property for the purpose of the present invention, and most preferable examples are nylon and K. Examples thereof include coated nylon (having a polyvinylidene chloride resin coated on the surface of nylon) and a laminated film having a gas barrier layer such as an ethylene-vinyl alcohol copolymer.

The chuck 12 has a male claw and a female claw,
There is no particular limitation as long as it is a type in which these are fitted to close the opening 11, and the number of chucks 12 is also not limited, but it is preferable to use a plurality for the purpose of improving the sealing performance. It is particularly preferable that the number is two in terms of the property, the price and the sealing property.

The method of manufacturing the bag 1 with a zipper according to the present invention has the greatest feature in the heat sealing method in the vicinity of the end of the zipper, and in other steps, for example, a tape-shaped zipper is heated on a plastic film. A well-known method for manufacturing a bag with a chuck, which is generally well known, such as three-way sealing of a film with a chuck obtained by a method of sealing, directly extruding a chuck onto a plastic film and fusing the same can be applied as it is.

The heat sealing method near the end of the chuck will be described in detail below. First, the first point seal is applied to the plastic film 2 in the vicinity of the chuck 12 while avoiding the chuck 12 for the purpose of preventing a sealing failure in the vicinity of the chuck 12. The expression "near the chuck end portion" used in the present invention means a portion of the chuck 12 near both side end portions 13 of the zipper bag 1 when the bag is formed. In this first point seal, for example, as shown in FIG. 2, a heat plate 3 having a contact surface having a plurality of groove portions 31 is used, and the groove portions 31 are heat-sealed so as to straddle the chuck 12. Can be achieved. The shape of the heat plate 3 is not limited to the above shape as long as it satisfies the gist of the present invention, but the width and depth of the groove 31 need to be larger than the width and height of the chuck 12. It goes without saying that there is.

Then, a second point seal including the chuck end 121 is provided so as to be completely overlapped with the first point seal for the purpose of perfecting the hermeticity in the vicinity of the chuck end. In this case, the chuck end 12 which is extremely thick
1, the plastic film 2 portion is heat-sealed at the same time. First, the periphery of the chuck 12 is completely sealed by the first point seal.
Since the point seal of No. 1 is performed so as to overlap with this first point seal, not only can the heat seal of the chuck end be directly heat-sealed as in the conventional case, but also the heat-sealing excellent in the sealing property can be achieved and the finished state can be obtained. , Productivity is also improved.

It is to be noted that the first portion 121 is formed near the chuck end portion 121.
The timing for applying the second point seal is not particularly limited, but it is preferable to perform before the heat sealing (side sealing) of the both side end portions 13 of the bag 1 with a zipper, since the finish is good.

[0013]

EXAMPLES The present invention will be described below with reference to examples.
Note that FIG. 3 shows the procedure. First, as the plastic film 2, a laminated film having a gas barrier property of nylon / low-density polyethylene / linear low-density polyethylene is used, and the chuck 12 is preliminarily formed into a tape shape having two chucks 12. Was used. First, a roll-shaped plastic film 2 is supplied from above and below so that a tape-shaped chuck 12 is sandwiched between them (not shown), and both side ends of the film 2 are heat-sealed to form a film on the chuck 12. 2, and the bottom portion 14 is formed as shown in FIG. Then, as shown in FIG. 3 (B), the first
Point seal is performed using the hot plate shown in FIG. First
The part sealed by the point seal of Fig. 3 (B)
It is the part shown in. After that, the second point seal shown in FIG. 3C is performed. The portion sealed by the second point seal is the portion shown in FIG. 3 (C). Finally, as shown in FIG. 3 (D), after heat-sealing (side-sealing) for forming both side end portions 13 of the bag is performed, the bag is cut to obtain the zipper bag 1 of the present invention. This zipper bag 1 was used as a compression futon bag, but the air did not flow into the bag and the storage stability was extremely good. The finished state of the bag was also good.

[0014]

[Effect] According to the method of the present invention, when the end of the chuck is heat-sealed, a gap due to a step is formed in the sealed portion, and wrinkles are formed on the film, resulting in poor bag finish and sealing performance. I was able to solve it.
Therefore, it becomes possible to apply a zipper bag having excellent convenience even in vacuum packaging applications such as a compression futon bag where sealing property is particularly required, and it is possible to expand the applications of the zipper bag. .

[Brief description of drawings]

FIG. 1 is a schematic explanatory view showing an example of a bag with a zipper 1 of the present invention.

2A is a front view and FIG. 2B is a side view showing an example of a heating plate 4 used for a first point seal.

FIG. 3 is an explanatory view showing an example of a manufacturing process of the bag with a zipper 1 of the present invention.

[Simple explanation of symbols]

1 Bag with Zipper of the Present Invention 11 Opening 12 Chuck 121 Chuck End 13 Both Ends 14 Bottom 2 Plastic Film 3 Hot Plate 31 Groove Part Sealed by First Point Seal Part Sealed by Second Point Seal

Claims (6)

[Claims] 1. A method for producing a zipper bag made of a plastic film, wherein heat sealing in the vicinity of a chuck end is performed by applying a first point seal to a plastic film portion close to the chuck while avoiding the chuck,
Next, a method for producing a bag with a chuck, characterized in that the second point seal is applied so as to overlap the first point seal including the chuck end portion. 2. The method of manufacturing a bag with a chuck according to claim 1, wherein the contact surface of the hot plate used for the first point seal has a shape having a plurality of grooves. 3. The method for producing a bag with a zipper according to claim 1, wherein the plastic film is a gas barrier laminate film. 4. The method for producing a bag with a chuck according to claim 1, wherein the bag is a bag with a chuck having a plurality of chucks. 5. A method of manufacturing a bag with a chuck for vacuum packaging according to claim 1. 6. A method for manufacturing a bag with a zipper for a compressed futon bag according to claim 1.