JP2000226042A - Bag with zipper, fabricating method thereof, and seal bar for use in the method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To decrease the thickness of a seal layer on the inner surface of a sheet material in a bag with zipper and prevent the sealing characteristics of the whole bag with zipper from being deteriorated. SOLUTION: The bag with zipper is prepared by stacking two sheet materials 11, 12, disposing a resin zipper comprising male zipper parts 21 and female zipper parts 22 between the materials 11, 12 from one of the ends of the bag to the other end thereof, and thermally bonding the periphery of the bag. The edge of the zipper, which is thermally bonded together with the sheet materials, comprises strongly bonded portions and weakly bonded portions, which are alternately formed. In the bag with zipper, a recess 41b is provided at a location on the surface thereof corresponding to the engaging part between the male zipper parts and the female zipper parts, constituting the resin zipper. The resin zipper can be easily fabricated by using a seal bar 41 wherein a plurality of strongly bonded ribs 42 extending inwardly from either edge of the recess 41b are disposed at predetermined intervals.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bag with a chuck having a chuck portion made of synthetic resin. More specifically, the present invention relates to a method for manufacturing such a bag with a chuck and a seal bar used in the manufacturing method.

[0002]

2. Description of the Related Art As a bag used for storing a shipping agent and the like, a rectangular bag with a chuck 10 having a chuck portion 20 which can be repeatedly sealed and opened and closed as shown in a partially cutaway view of FIG. Are known.

In such a bag 10 with a zipper, first, a male zipper tape 21 and a female zipper tape 22 are welded to the inside of each of two opposing sheet materials 11 and 12, and then the four sides are further heated. It is formed by fusing (sealing). Double chuck tape
The chuck portion composed of 21 and 22 extends from one edge to the other edge of the bag, and therefore has a rectangular bag with a chuck.
On the two opposing sides 10a and 10b of 10, it is necessary to integrally heat-bond a total of four elements of two sheet materials 11, 12 and two chuck tapes.

The bag 10 with a zipper is manufactured with a shipping agent (not shown) sealed therein, and the user cuts the upper side of the zipper section with scissors 15 or the like as shown in FIG. The bag 10 with the zipper is used repeatedly.

FIG. 2 is a schematic explanatory view showing an example of a manufacturing process of the bag 10 with a chuck. In FIG. 2, a plurality of bags 10 with chucks manufactured continuously are shown from above.
The two sheet members are in an overlapping state. On the inner surface of each sheet material pulled out from the roll and flowing in the direction of the arrow,
Prior to the step of FIG. 2, the male chuck tape 21 and the female chuck tape 22 are fused. FIG.
The belt-shaped area 20 'represented by the chain line is the tape 2
The positions where 1 and 22 are arranged are shown.

In the rectangular regions R1 and R2 indicated by broken lines in FIG. 2, the opposing edges of the continuously flowing sheet material are sealed by a seal bar described later. The elongated areas S1, S2, and S3 indicated by diagonal lines on the sheet material indicate the sealed areas on the sheet material, and the other two sides orthogonal to these areas are the same as those shown in FIG. Alternatively, sealing is performed separately at a later stage. Finally, each of the regions S1, S2, S3,.

In each of the regions S1, S2, S3,..., It is necessary to press-bond and seal a total of four elements of two sheet materials and two chuck tapes disposed therebetween. It is necessary to perform a more secure and stronger seal than the seal portions on the two sides. In order to seal this part,
A conventionally employed method will be described with reference to FIGS.

FIG. 3 shows seal bars 31 and 32 used for sealing a side edge including the chuck portion. These seal bars are used as shown in FIG. FIG. 4 is a sectional view taken along line 4-4 of the manufacturing process shown in FIG.

One of the two seal bars 31, 32 has a concave portion 31b formed partially on the seal surface 31a. On the other hand, the entire sealing surface 32a of the other sealing bar 32 is formed flat. As shown in FIG. 4, the sealing surface 31 of the seal bar 31
a and the flat sealing surface 32a of the seal bar 32 is arranged upward. Then, sealing is performed by sandwiching the sheet materials 11 and 12 and the male and female chuck tapes 21 and 22 between the seal bars 31 and 32.

At this time, the male head 21 of the male chuck tape 21
a where female head 22a of female chuck tape 22 engages
At the position corresponding to the (engagement site), the recess 31b of the seal bar 31 is provided.
Are set relative to the sheet materials 11, 12 and the seal bars 31, 32. When the seal bar 32 on the lower side is moved upward from the state of FIG. 4 to perform sealing, the thermal fusion of the sheet materials 11 and 12 and the entire seal bars 31 and 32 is completed as shown in FIG.

A thermoplastic resin layer such as polyethylene is provided on the inner surfaces of the sheet members 11 and 12 as a seal layer, whereby the sheet members are thermally fused to each other. The male and female chuck tapes 21 and 22 are also made of a thermoplastic resin, so that the sheet material and the chuck tape are also thermally fused to each other. In FIG. 5, the male and female engaging portions are clearly shown even after the heat fusion, but in reality, the engaging portions are completely crushed.

When the sheet material and the zipper tape are to be integrally heat-sealed as described above, the widthwise edge region A of the zipper tape has a four-layer structure as shown in FIG. In this portion, a hole that communicates with the outside is likely to be formed, thereby impairing the sealing performance of the bag with the chuck. In order to prevent this, conventionally, the amount of the thermoplastic resin constituting the seal layer on the inner surface of the sheet material is increased and increased. Further, in addition to the above, a device has been devised such as providing a slope on the surface of the seal bar so that a large amount of molten resin gathers near the end of the zipper tape during thermal fusion.

However, increasing the thickness of the seal layer causes the following problems. First, since methyl salicylate, menthol, and the like, which are the active components of the shipping agent stored in the bag with the zipper, have a property of being adsorbed by a thermoplastic resin such as polyethylene mainly used for the sealing layer, the sealing layer is As the thickness increases, the amount of the absorbed active ingredient also increases. Normally, the shelf life of a shipping agent is about three years, so that the effect of adsorption is large. On the other hand, if a large amount of the active ingredient is contained in the shipping agent from the beginning in anticipation of this, various inconveniences may occur not only in terms of cost but also in terms of properties as a pharmaceutical. Further, since the amount of resin used as the seal layer increases, there is a problem that the manufacturing cost of the bag with the chuck itself increases.

[0014]

Therefore, the technical problem to be solved by the present invention is the above-mentioned bag with a zipper.
An object of the present invention is to reduce the thickness of the seal layer on the inner surface of the sheet material and to prevent the sealing performance of the entire bag with a chuck from being impaired.

[0015]

SUMMARY OF THE INVENTION The present invention has been made in order to effectively solve the above problems, and provides a bag with a chuck having the following features.

That is, in the bag with a zipper of the present invention, two sheets are stacked, and a "resin chuck made of a male chuck portion and a female chuck portion" is placed between one edge and the other edge of the bag. It is arranged so as to extend and the peripheral edge of the bag is heat-sealed. The edge of the resin chuck heat-sealed together with the sheet material is formed by alternately providing strong fusion parts and weak fusion parts.

In the bag with a chuck according to the present invention having the above structure, the edges of the male and female chuck portions are securely and firmly sealed in the strongly fused portion and escaped when the strongly fused portion is formed. Since the molten resin wraps around the weakly fused portion, sufficient resin is supplied to the weakly fused portion. Therefore, even if the seal layer provided on the inner surface of the sheet material is not particularly thick, the sealing performance at the entire edge of the chuck portion is ensured, and a hole communicating with the outside is formed in the portion, resulting in a disadvantage that the sealing performance is impaired. Hateful.

In the bag with a chuck according to the present invention, the male chuck portion and the female chuck portion constituting the resin chuck are formed of elongated members extending from one edge to the other edge of the bag. You may comprise so that the width direction edge position with a female chuck part may mutually be shifted. As a method of shifting the width direction edge positions of both chuck portions from each other, `` different overall width dimensions of both chuck portions are different '' or `` the overall width dimensions of both chuck portions themselves are equal to each other, and Shifting the formation position of the engagement portion from the center position in the entire width in the opposite direction "and the like.

When such a configuration is adopted, the number of elements stacked at the edge of the chuck portion can be reduced, so that the above-described strong fusion portion and weak fusion portion can be omitted. A hole communicating with the outside can be prevented from being formed at the edge. However, by providing both the strong fusion portion and the weak fusion portion, the generation of holes can be more reliably prevented.

The bag with a zipper according to the present invention is arranged such that a resin-made zipper comprising a male chuck portion and a female chuck portion extends from one edge to the other edge of the bag between two opposing sheet materials. And a step of thermally fusing the periphery of the bag together with the resin chuck. In this method, when the peripheral edge of the bag is thermally fused, the strong fusion parts and the weak fusion parts are formed alternately at the edge of the resin chuck thermally fused with the sheet material. .

The alternately located strong and weakly fused portions are:
It can be easily provided by using the seal bar of the present invention. That is, the seal bar of the present invention has a concave portion at a surface position corresponding to an engagement portion of the male chuck portion and the female chuck portion constituting the resin chuck.
Then, a plurality of ribs for strong fusion bonding extending from both end edges of the concave portion toward the inside of the concave portion are arranged at predetermined intervals. The number of ribs for strong fusion is not particularly limited,
It is sufficient that a plurality of strongly fused ribs exist at predetermined intervals,
For example, about 2 to 10 are suitable. As a result, "the convex part by the rib" and "the concave part alternately arranged with respect to it"
Accordingly, a strong fusion portion and a weak fusion portion can be alternately formed in the fusion portion of the bag with the chuck.

[0022]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. The basic configuration of the bag with a zipper of the present invention is the same as that of the conventional example shown in FIG. Therefore, the manufacturing procedure is the same as in the case of the conventional example described with reference to FIG. However, the structure of the edge portion of the bag, in which the two sheet materials and the zipper tape disposed therebetween are integrally fused, is different, and accordingly, the structure of the seal bar used in the heat fusion process is also different from the conventional one. Is different.

FIG. 6 is a perspective view showing a seal bar 41 according to the present invention. This seal bar 41 replaces the conventional seal bar 31 shown in FIG. 3, and the other seal bar 32 having a flat sealing surface is similarly used in the present invention.

The seal bar 41 of the present invention differs from the conventional seal bar in that a rib 42 for strong welding is formed in a concave portion 41b formed in a seal surface 41a. Rib 42
It extends from both edges of the concave portion 41b toward the inside of the concave portion.
For simplicity of illustration, FIG. 6 assumes that two ribs, two in total, extend from each end of the recess. However, the number of the ribs 42 is not particularly limited, and a plurality of ribs 42 may be provided at predetermined intervals. As a result, at each end edge of the concave portion 41b, there is a convex portion 42 formed by a rib and a concave portion 43 which is alternately repeated with the convex portion.

FIG. 7 shows the positional relationship between the seal bar 41, the sheet members 11, 12 and the chuck tapes 21, 22 in the actual manufacturing process. FIG. 7 is a sectional view corresponding to FIG. 4 showing a conventional example. The widthwise edges 21b and 22b of the male and female chuck tapes 21 and 22 are located at substantially both edges of the recess 41b of the seal bar. In addition, it can be seen that the joint portion between the male chuck tape 21 and the female chuck tape 22 exists at a position corresponding to between the two ribs 42 facing each other. In the example of FIG.
The width L1 of 41b is 13 mm, the maximum depth is 0.2 mm, the extension length L2 of the rib 42 is 4 mm, and the entire width of the chuck tapes 21 and 22 is 13 mm. However, these dimensions are
This is just an example.

The edge of the bag 100 with a zipper according to the present invention, which is heat-sealed using the seal bar 41, will be described with reference to FIG. 8 corresponding to FIG. As in the case of FIG. 2, the hatched portion indicates the portion thermally fused by the seal bars 41 and 32, and the region 20 'indicated by the dashed line indicates the chuck tape existing region. Of the both ends in the width direction of the chuck tape, a portion corresponding to the rib (convex portion) 42 is a strong fusion portion 42 ′, and a portion corresponding to the concave portion 43 that is present alternately with the rib 42 is a weak fusion portion 43 ′. Becomes

When heat sealing is performed using the seal bar 41 of the present invention, a portion corresponding to the rib (convex portion) 42 is strongly pressed to form a strongly fused portion 42 '. On the other hand, the portion corresponding to the concave portion 43 is relatively weakly pressed to form a weakly fused portion 43 '. Then, when the strongly fused portion 42 'is formed, the molten resin that escaped from that portion goes around to the weakly fused portion 43', and the resin is sufficiently filled in the weakly fused portion 43 '. As a result, the chuck tape
It is possible to reliably achieve a strong seal even in a portion that is heat-sealed while sandwiching the portions 21 and 22 therebetween.

FIG. 9 is an enlarged view showing a modification of the fusion region shown in FIG. The bag 100 with a zipper shown in FIG. 8 is manufactured using the seal bar 41 shown in FIG.
The number of 42 'is four corresponding to the number of ribs 42. On the other hand, in FIG. 9, since the 20 strong fusion parts 142 'are provided, the fusion strength is further increased, and the generation of holes communicating with the outside is more reliably prevented. Needless to say, a seal bar (not shown) having a total of 20 ribs for strong fusion bonding is used for manufacturing the bag with the chuck.

FIG. 10 shows a modified example of the male and female chuck tapes used in the bag with a chuck according to the present invention.
The chuck tapes 51 and 52 in FIG. 10 differ from the chuck tapes 21 and 22 shown in FIG. 7 in that the overall widths of the two chuck tapes are different from each other. The other basic configurations are the same. The actual dimensional difference is 0.5
It is preferably about 4 mm, that is, about 1 to 8 mm in total width difference.

FIG. 11 shows still another modification of the chuck tape. In FIG. 10, the entire width of the lower male chuck tape 51 in the figure is smaller than the entire width of the upper female chuck tape 52, whereby the widthwise edge positions of both chuck tapes are shifted from each other. On the other hand, in the example of FIG. 11, the overall width dimensions of both chuck tapes are equal to each other, but by displacing the formation positions of the male and female heads of each chuck tape in the opposite direction from the central position of the overall width. ,
The width direction edge positions of both chuck tapes are shifted from each other. The amount of deviation of each edge position is preferably about 0.5 to 4 mm.

If the width direction edge positions of both chuck tapes coincide, as can be seen from FIG. 5, the width direction edge region A of the chuck tape has a four-layer structure. On the other hand, when the zipper tapes of FIGS. 10 and 11 are employed, the widthwise edge region corresponding thereto has a three-layer structure, and a hole communicating with the outside is formed in that portion, so that the sealing performance of the bag is improved. There is an advantage that damage is less likely to occur. In the example of FIG. 10, the female chuck tape 52 has a larger overall width, but the same effect can be obtained even if the reverse is true.

As described above, since the widthwise edge region of the chuck tape can have a three-layer structure, it is possible to use a seal bar 41 having ribs for strong fusion as shown in FIG.
Even when the conventional seal bar shown in FIG. 3 is used, it is possible to effectively prevent a hole from being generated in the edge portion in the width direction of the chuck tape. But even in that case,
It is preferable to provide the above-described strong fusion part and weak fusion part together.

Diagram in which the positions of the edges in the full width direction are shifted from each other.
When using zipper tapes such as 10 and 11, the edge located closer to the engagement between the male and female heads
(In the example of FIG. 10, the edges 51b, 51b) are concave portions of the seal bar 41.
The dimensions of each member are set so as to be located substantially at both ends of 41b.

In the above-described embodiment, for the sake of simplicity, both ends of the bag including the male and female chuck tapes and the two elements of the sheet material are heat-sealed once using a seal bar. An example of completion by heat fusion is described. However, in practice, in order to crush the chuck tape more effectively, it is common practice to perform the heat fusion of the above-mentioned edge by the seal bar in several steps of a preheating step and a finishing step.
Further, an additional heat fusion step for imparting a concavo-convex pattern or the like to the heat fusion portion may be further added.

The seal bar of the present invention can be used not only in the finishing step of heat fusion as shown and described, but also in the above-mentioned preheating step and additional steps. Further, the seal bar of the present invention can be used in all of these steps.

In the illustrated example, the seal bar 41 provided with the rib 42 for strong fusion bonding is arranged on the upper side where the female chuck tape 22 is located. However, the seal bar 41 is located on either the upper side or the lower side. It may be arranged. Further, the seal bar 41 may be arranged on the male chuck tape side instead of the female chuck tape side.

[Brief description of the drawings]

FIG. 1 is a partially broken schematic perspective view illustrating a conventional bag with a chuck.

FIG. 2 is a schematic diagram illustrating a manufacturing process of the bag with a chuck of FIG.

FIG. 3 is a schematic perspective view showing a conventional seal bar used in the manufacturing process of FIG.

FIG. 4 is a sectional view taken along line 4-4 of FIG. 2;

FIG. 5 is a schematic cross-sectional view showing a heat-sealed portion by the seal bar of FIG. 3;

FIG. 6 is a schematic perspective view showing a seal bar according to one embodiment of the present invention.

7 is a cross-sectional view illustrating a manufacturing process using the seal bar of FIG. 6, and corresponds to FIG.

FIG. 8 is a partial explanatory view showing a heat-sealing area by the seal bar of FIG. 6, and corresponds to FIG. 2;

FIG. 9 is a partially enlarged view showing a modification of the heat fusion region shown in FIG.

FIG. 10 is a sectional view showing a modified example of the male and female chuck tapes used in the bag with a chuck of the present invention.

FIG. 11 is a sectional view showing still another modified example of the male and female chuck tapes used in the bag with a chuck of the present invention.

[Explanation of symbols]

10 Conventional zippered bag 10a, 10b Edge of zippered bag to which zipper part is integrally fused 11, 12 Sheet material 15 Scissors 20 Chuck part 20 'Area where zipper tape exists on sheet material 21 Male zipper tape 21a Male chuck tape male head 21b Male chuck tape width edge 22 Female chuck tape 22a Female chuck tape female head 22b Female chuck tape width edge 31 Seal bar 31a Seal surface 31b Recess 32 Seal bar 32a Seal Surface 41 Seal bar 41a Seal surface 41b Concave part 42 Strong fusion rib (convex part) 42 ', 142' Strong fusion part 43 Recess 43 'Weak fusion part 51 Male chuck tape 51b Width edge of male chuck tape 52b Female zipper tape 52b Width edge of female zipper tape 100 Bag with zipper of the present invention

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shinichiro Koyasu 1-1-1 Ichigaya-Kaga-cho, Shinjuku-ku, Tokyo F-term in Dai Nippon Printing Co., Ltd. 3E064 HN11 3E075 AA09 BA42 CA02 DD13 DD32 DD46 DE17 GA04

Claims (4)

[Claims] 1. Two sheet materials (11, 12) are stacked, between which a male chuck portion (21, 51) and a female chuck portion (22, 52)
A resin chuck (20) made of a resin-made zipper, which is formed by extending from one end of the bag to the other end thereof and heat-sealing the periphery of the bag. The edge of the attached resin chuck is
A bag with a zipper, characterized by alternately providing strong fusion parts (42 ') and weak fusion parts (43'). 2. The two sheet materials (11, 12) are stacked, between which a male chuck portion (21, 51) and a female chuck portion (22, 52)
A resin-made chuck (20), which is arranged by extending from one end edge to the other end edge of the bag, and the peripheral edge of the bag is heat-fused. 20) is composed of an elongated male chuck portion (51) and a female chuck portion (52) extending from one edge of the bag to the other edge, and the widthwise edge of the male chuck portion and the female chuck portion is formed. A bag with a zipper, wherein the positions are shifted from each other. 3. A resin chuck (20) comprising a male chuck portion (21, 51) and a female chuck portion (22, 52) between two opposing sheet materials (11, 12) at one edge of a bag. A step of extending from the other end to the other edge, and a step of heat-sealing the bag periphery together with the resin chuck (20);
A method of manufacturing a bag with a zipper, comprising the steps of:
A method for manufacturing a zipper-equipped bag, comprising alternately providing a strong fusion portion (42 ') and a weak fusion portion (43'). 4. A stack of two sheet materials (11, 12) between which a male chuck portion (21, 51) and a female chuck portion (22, 52)
In the manufacture of a bag with a zipper, the resin chuck (20) is arranged so as to extend from one end edge of the bag to the other end thereof, and is formed by heat-sealing the periphery of the bag. 20) is a seal bar used for heat-sealing the sheet material (11, 12) together with the sheet material (11, 12), wherein a concave portion is provided at a surface position corresponding to an engaging portion of the male chuck portion and the female chuck portion constituting the resin chuck. (41b) A seal bar, wherein a plurality of ribs (42) for strong fusion welding extending from both end edges of the recess toward the inside of the recess are arranged at predetermined intervals.