JPH07112496A - Manufacture of zipper bag - Google Patents

Abstract

PURPOSE:To prevent a part which crosses a zipper whose interlocking part is interlocked and a side seal each other from having insufficient strength by crushing the interlocked zipper while melting it with a heat bar at prescribed intervals, inserting it in the mouth of a bag body, and carrying out side sealing on the bag body side at the crushed part. CONSTITUTION:A zipper 10 consists of a tape 11 formed with a male piece 12, and a tape 13 formed with a female piece 14. crushed part 16 is formed at fixed intervals by a heat bar with an interlocking part 15 interlocked. After inserting it into the mouth of a bag body 17 for heat sealing, the zipper 10 and the bag body 17 are heat-sealed in a lateral direction, meeting the crushed part 16 with side seal bars 18, 19. The zipper 10 may be interlocked by forming the male piece 12 and the female piece 14 at one piece of zipper tape and bending it into a U shape.

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 having a zipper in its mouth.

[0002]

2. Description of the Related Art When manufacturing a bag in which a zipper consisting of a male thread and a female thread is attached to the inside of a mouth, in order to make a side seal on the side of the bag, a heat seal bar must be pressed against the zipper in the mouth. Is required. As a result, as shown in FIG. 6, the thickness (dissolved resin amount) of the occlusal portion 2 of the zipper 1 including the male thread 3 and the female thread 4 increases, so that the flat heat seal bars 5 and 6 were used. In this case, the amount of dissolution and the pressing force are insufficient in the portions on both sides W ₁ and W ₂ of the occlusal portion 2, and the problem of defective sealing is likely to occur. Therefore, conventionally, methods such as increasing the temperature of the heat seal bars 5 and 6 and increasing the pressing force have been adopted, but in the case of these methods, conversely, both sides W ₁ and W of the occlusal portion 2 are used. ₂
The problem of excessive melting and excessive pressing occurred in the part of
It often causes pinholes.

As a means for solving the above-mentioned problems, the occlusal portion of the zipper which is to be side heat-sealed is punched in advance, and the punched portion is heat-sealed to thereby form the occlusal portion 2 and the occlusal portion. A bag making method is known in which the difference between the amounts of resin on both sides W ₁ and W ₂ is alleviated (Japanese Patent Application Laid-Open No. 62-1961).
31 publication).

[0004]

However, this known example has the following drawbacks.

A. When punching, the diameter of this hole is set to be slightly larger than the width of the occlusal part 2 in consideration of the error, and since the hole is punched out by the zipper, the strength of this part is weaker than other parts. Become.

B. Since punching is performed using a circular blade for punching, the bag making speed cannot be increased above a certain level because of the momentum of the blade.

An object of the present invention is to solve the above problems a and b in the method of manufacturing a bag with a zipper.

[0008]

The method of manufacturing the bag with a zipper according to the present invention is as follows.

The zipper with the occlusal part occluded is crushed while being melted by a heat bar at each seal interval in advance, and the zipper is inserted into the mouth of the bag body and the side seal on the bag body side is provided outside the crushed portion. How to make a zipper bag.

As the zipper, a type in which an occlusal portion composed of a male strip and a female strip is formed on separate tapes, or an occlusal portion formed of a male strip and a female strip is formed on the same surface of one tape,
It is possible to use a type in which a male line and a female line are occluded by bending in a U shape between the male line and the female line.

[0011]

[Function] The zipper having separate male and female strips is wound up in a roll shape in a state where the male strip and the female strip are engaged, and the zipper is supplied from this roll. On the other hand, in the case of a zipper in which a male strip and a female strip are formed on one piece of tape, the zipper is wound in a flat state into a roll, and is formed in a U shape while being fed out, and the male strip and the female strip are formed. Is occluded.

The zipper with the occlusal part occluded is crushed by a crushing heat bar while applying heat at a constant interval (width of the bag) and melting. This crushed width is slightly larger than the width of the side seal of the bag.

The zipper crushed at regular intervals is then inserted into the mouth of the bag body and is heat-sealed (or adhered with an adhesive) to the bag body. In addition, the bag body side uses two films on the front and back, one film is bent in a U shape, a gusset bag, a so-called standing in which an inverted V-shaped bottom film is inserted in the bottom of the bag. Those called pouches, etc.

The side of the bag body that has been heat-sealed by inserting the zipper into the mouth then reaches the side seal bar that is arranged so as to cross the zipper and the bag body, where the side seal of the bag is performed. Be seen. The side seal bar is fitted to the crushed part of the zipper, and is adjusted so as not to be applied to the occlusal part other than the crushed part.

In the case of automatic filling, the contents are put into the bag when the side sealing is performed, then the other side sealing is performed and the bag is sealed, and then cut in the middle of the side sealing. The bag is cut off.

When the filling is not automatic, the contents are not filled and the bags are separated one by one.

[0017]

The present invention will be described in detail below with reference to the drawings of the embodiments.

FIG. 1 shows a zipper used for carrying out the present invention. The zipper 10 comprises a tape 11 having a male thread 12 and a tape 13 having a female thread 14,
In the state where the occlusal portion 15 is occluded, the crushing portions 16 are formed in advance by a crushing heat bar at regular intervals.

As shown in FIG. 2, the zipper is inserted into the mouth of the bag body 17 side and heat-sealed into the mouth of the bag body film 17 by a known means (not shown). The bars 18 and 19 heat-seal the zipper 10 and the bag body 17 in line with the crushed portion 16 at the portion a indicated by the alternate long and short dash line.

At the time of this side sealing, the zipper 1
As shown in FIG. 3, the 0 bite portion 15 is flattened by being crushed.

FIG. 4 shows a zipper bag manufactured by the above-described manufacturing method. The zipper 10 that crosses the side seals 20 and 21 is uniformly heat-sealed because the bite part 15 is crushed in advance. There is.

FIG. 5 shows a zipper 22 in which a male strip 12 and a female strip 14 are formed on one piece of zipper tape 23, and the zipper tape is bent in a U shape and engaged with each other. It is attached in the mouth of the bag body 17.

[0023]

As described above, the present invention has the following effects by crushing the occlusal portion of the zipper in advance according to the width of the side seal.

A. Since there is no punching as in the known technique, there is no fear of insufficient strength at the portion where the zipper and the side seal intersect.

B. Since it is only crushed by the heat bar, the bag making speed can be increased by about 10% compared to the punching method.

[Brief description of drawings]

FIG. 1 is a perspective view of a zipper according to the present invention.

FIG. 2 is an explanatory view of a manufacturing method according to the present invention.

FIG. 3 is an explanatory view showing a relationship between a zipper portion and a side seal bar.

FIG. 4 is an explanatory view of a bag manufactured by the manufacturing method according to the present invention.

FIG. 5 is an explanatory view of a zipper formed in a U shape.

FIG. 6 is an explanatory view showing a relationship between a conventional zipper and a side seal bar.

[Explanation of symbols]

 10 zipper 15 occlusal part 16 crushing part 17 bag body 18, 19 side seal bar

Claims (3)

[Claims] 1. A zipper having an occlusal occlusal part is crushed while being melted by a heat bar in advance at each seal interval, and the zipper is inserted into the mouth of the bag main body and the side on the bag main body side is outside the crushed part. How to make a bag with a zipper that seals. 2. The method for producing a bag with a zipper according to claim 1, wherein a zipper in which an occlusal portion composed of a male strip and a female strip is formed on separate tapes is used. 3. A zipper formed by forming an occlusal portion composed of a male strip and a female strip on the same surface of a piece of tape, and bending the male strip and the female strip in a U-shape in the middle of the male strip and the female strip. The method for producing a bag with a zipper according to claim 1, wherein.