JPH1191805A - Bag having fastener - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the sealability from being broken even when the bag is unsealed by tearing from a notch or the like of a side sealed part by a method wherein at a location where a tape base for which a male fitting line and a female fitting line are respectively provided, is fitted, the tape base is heat-welded to a heat-sealing surface of the bag, and a non-heat-welded end part is provided at the unsealing side end part of the tape base. SOLUTION: For this bag having fastener, on the internal surface at a location close to the unsealing edge of the bag, a tape base 11 part for a pair of fastener tapes having male-female fitting parts 10, is heat-welded. Then, when the tape base 11 is heat-welded to the base film 4 of the bag, at the external end of the heat-welded part of the tape base 11, a non-heat-welded end part 13 is formed. In addition, when a fastener tape T is fitted on the internal, surface of the bag, both parts are heat-welded at the same time under a state wherein the male-female fitting parts 10 of the fastener are fitted in advance. By this method when the total edge of the top part is separated by tearing a packaging material of a top sealed part and the fastener part of the bag from a notch 3 which is provided on the side sealed part, the tearing line does not reach the fastener part, and the sealability can be retained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of making a bag with a so-called zipper, and more particularly to a bag structure capable of providing a stable opening property.

[0002]

2. Description of the Related Art Bags with a zipper are mainly used for packaging powders and small solids irrespective of foods, industrial supplies, household goods, etc. because of their simple resealability. As shown in FIG. 1A or 1B, the structure of the chuck or the chuck tape is such that a fitting portion formed by a groove-shaped (female) and rail-shaped (male) molded body is provided on a tape base 11. It was formed. When the bag is manufactured, on the bag making machine,
After the male and female fitting portions are set to face each other so that they can be fitted, the tape bases 11 at both ends of the fitting portion are heat-sealed to the base film 4 constituting the bag to attach the male and female fitting portions. Can be a bag. When the zipper-equipped bag is used by the consumer, the film between the zipper part provided on the upper part of the sack part and the top seal part is torn, the outside of the zipper part is opened, and the zipper can be opened and closed. Scissors or cutters may be used as a method of separating the top seal side (opening side) of the bag from the bag body side. Usually, a V-notch 3 provided on the side seal portion at the end of the unheated fusion portion is used.
Torn by hand from etc. In the case of a bag in which the zipper is heat-sealed by a conventional general method, in opening the bag, the top-side film of the bag is torn by cutting off the packaging material from the notch portion. As it tears, the tip of the tear may rip to the tape base end of the chuck. It is sufficient if the diagonal tear stops at the end of the tape base and the base film 4 tears parallel to the chuck along the outer edge of the tape base 11, but in an extreme case, the diagonal tear also cuts through the tape base 11. If the tip of the tearing line also tears the tape base 11 and reaches the root of the fitting portion, resealing by the chuck is impossible as a result. Will be. That is, the original function as the chuck is not fulfilled. As a countermeasure, when tearing by hand from the notch, laminating a material having a linear cut property in the packaging material composition of the film constituting the bag so that only the film part between the top seal and the chuck part is torn, Various methods have been adopted in which a tape containing at least a uniaxially stretched film is adhered to the inner surface of the film between the top seal and the chuck portion. However, as described above, laminating a material having a straight-cut property in the packaging material configuration constituting the bag body, or attaching a tape including a uniaxially stretched film is a special material only for the straight-cut property. This causes an increase in the number of steps or an increase in manufacturing cost due to lamination or sticking.

[0003]

The tear-opening of a bag with a zipper can be achieved without using a special plastic film or part, even when the bag is torn from a notch or the like provided in a side seal portion of a bag with a zipper.
Provided is a technique capable of inexpensively providing a bag with a chuck that does not destroy the sealing performance of the bag with a chuck.

[0004]

A bag having a heat-sealing surface facing each other and a heat-sealing peripheral portion thereof, wherein a tape base provided with a male fitting strip and a tape base provided with a female fitting strip are provided. At the position where the male fitting strip and the female fitting strip are fitted, the respective tape bases are heat-fused to the heat-sealed surface of the bag by the zipper portion of the zipper-equipped bag. A bag with a zipper, characterized in that a non-heat-sealed end is provided at least at an opening side end of the tape base heat-sealing.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The bag with a zipper according to the present invention can be implemented without changing the shape of a conventional bag with a zipper, and is made by changing a heat-sealed portion of a zipper tape bag to a base film 4. Things. FIG. 1 is a view showing an embodiment of a bag with a zipper according to the present invention.
It is an X section sectional view, (c) It is an enlarged sectional view of the Y section. FIG.
FIG. 4 is a cross-sectional view illustrating heat fusion of the chuck tape in the example of the present invention. FIG. 3 is an enlarged cross-sectional view of a heat-sealed portion of the chuck tape, showing (a) an example of the present invention and (b) an example of a conventional example. FIG. 4 is a cross-sectional view illustrating the configuration of the material (base film) of the bag of the bag with a zipper according to the present invention.
(B) Three layers are shown.

The structure of the bag with a zipper of the present invention is shown in FIG.
As shown in (b) and (b), a zipper tape T provided with a zipper part which is openably and closably fitted to the inner surface of the bag is heat-sealed, and the zipper tape T is generally a quadrilateral seal bag. Or it is often used for rectangular objects. The present invention will be described by exemplifying a usual four-side seal bag. FIG. 1 is a front view of a bag with a zipper showing an embodiment of the present invention, and a cross-sectional view taken along a line XX. A bag with a zipper formed by heat-sealing a tape base 11 portion of a pair of zipper tapes having male and female fitting portions on the inner surface of the bag near an opening side, wherein the tape base 11 has an opening side end. By providing a non-heat-fusion end portion in the portion, the bag can be stably opened.

The base film 4 as a material of the bag P in the present invention has a two-layer structure of a base material layer 5 and a sealant layer 6 as shown in FIGS. 4 (a) and 4 (b). Thus, an intermediate layer 7 can be provided between the base material layer 5 and the sealant layer 6. As the base material layer 5, a material having little expansion and contraction, that is, good dimensional stability and heat resistance is used in steps such as printing and lamination. The sealant layer 6 is formed of a material that can be heat-sealed when a bag is made and that can be thermally fused with the zipper tape T. The intermediate layer 7 is laminated as a bag to improve barrier properties, light-shielding properties, decorative properties, and the like necessary for protecting the quality of the contents. An adhesive layer 8 can be interposed between the base layer 5 and the sealant layer 6, between the base layer 5 and the intermediate layer 7, or between the intermediate layer 7 and the sealant layer 6. .

The base material layer 5 is preferably made of a material having excellent dimensional stability and good printability.
Cloth, metal foil, polyethylene, polypropylene, ethylene-vinyl acetate copolymer, linear low-density polyethylene, ethylene-α polymerized using a single-site catalyst
-An olefin copolymer, nylon, polyester, polycarbonate, stretched or unstretched film formed from a resin such as polyvinyl alcohol, or
It may be a co-extruded film obtained by co-extrusion of the resin. Further, the base film may be formed by depositing a metal such as aluminum, an inorganic compound such as aluminum oxide or silicon dioxide, or another compound, or coating a barrier agent such as vinylidene chloride.

The sealant layer 6 exhibits a stable heat-sealing property in the bag making step of the bag with a zipper of the present invention, and falls during distribution or storage as a package filled with contents. , It is necessary to have strength to withstand vibration, and further, the tape base 1 of the chuck is required.
1. Select a material having an adhesive property with (1). Specific materials as the sealant include polyethylene, polypropylene, ethylene-vinyl acetate copolymer, linear low-density polyethylene, ethylene-α-olefin copolymer polymerized using a single-site catalyst, nylon, polyester, and polycarbonate. A film formed from a resin such as polyvinyl alcohol, ethylene / vinyl alcohol copolymer, or the like as a raw material is dry-laminated to the base layer 5 using an adhesive, or these resins are coated on the base layer 5. Alternatively, a film may be formed on the intermediate layer 7 by melt extrusion to form a laminate type packaging material.

As the intermediate layer 7, a material layer having characteristics satisfying the required physical properties such as the light-shielding property, gas-blocking property and moisture-proof property may be selected and laminated. As the material used as the intermediate layer 7, a metal foil such as an aluminum foil and various plastic films can be laminated. Specifically as the plastic film, polyethylene, polypropylene, ethylene-vinyl acetate copolymer, linear low-density polyethylene, ethylene-α-olefin copolymer polymerized using a single-site catalyst, polyamide, polyester, polycarbonate, polyvinyl A stretched or unstretched film formed from a resin such as an alcohol or an ethylene / vinyl alcohol copolymer as a raw material, or a coextruded film obtained by coextrusion of the resin may be used. Among them, a film made of a resin such as polyamide, polyvinyl alcohol, ethylene / vinyl alcohol copolymer, or a film formed by laminating these resins on a base material by melt extrusion and laminating, a packaging material having excellent barrier properties can be obtained. . Further, the film may be a coating film obtained by depositing a metal such as aluminum, an inorganic compound such as aluminum oxide or silicon dioxide, or another compound, or coating a barrier agent such as vinylidene chloride.

The zipper tape T of the present invention is generally obtained by molding a thermoplastic resin by a profile extrusion method. As the above-mentioned thermoplastic resin, a resin exhibiting flexibility or elasticity with good fitting aptitude and capable of being thermally fused to the inner surface of the base film 4 can be used. In particular,
Polyethylene (PE), polypropylene (PP), ethylene / vinyl acetate copolymer (EVA), ethylene ethyl acrylate (EEA), ethylene acrylic acid (EA)
A), ethylene methacrylic acid (EMAA), linear low-density polyethylene, ethylene-α-olefin copolymer polymerized using a single-site catalyst, ionomer, and the like.

In the bag making process, the zipper tape T is used.
It is thermally fused to the base film 4 in-line. That is, the surface of the chuck portion 12 of the chuck tape T faces each other,
The back surface of each tape base 11 is applied to the base film 4
, But generally, the portion 12 immediately below the chuck portion is not heat-sealed to the base film 4. In the present invention, the base film 4 of the bag is used.
When the tape base 11 of the chuck is thermally fused to the
(C) As shown in FIG.
A non-heat-sealed end portion 13 is formed at the outer end of the heat-sealed portion to the base film 4. However, the above-mentioned non-heat-sealed portion 13 may or may not be formed in the heat-sealed portion 14 of the tape base 11 on the contents storage portion side of the bag to the base film 4. When attaching the zipper tape to the inner surface of the bag, the tape base having the male fitting portion and the tape base having the female tape are heat-sealed to the inner surface of the bag by separate sealing devices. The outer edge of the bag may be heat-sealed while fitting the fitting portion of the chuck, but in fact, the male and female fitting portions of the chuck are supplied in a state of being fitted in advance, and both the male and female tape bases are simultaneously attached. Heat fusion. When the fitted zipper tape is heat-sealed to the inner surface of the bag, a stable-quality zippered bag can be obtained without displacement of the fitted portion.

The packaging material for the top seal portion and the chuck portion of the bag is torn from the notch 3 provided on the side seal portion of the bag with a chuck according to the present invention obtained as described above, and the entire top portion of the bag is torn. Although the sides are separated, the direction of the tear (the tear line) is also directed to the direction of the heat-sealed portion between the tape base 11 and the sealant layer 6 of the base film 4 because of the presence of the non-fused portion 13. Since only the base film 4 tears along the edge of the non-heat-sealed portion 13,
Even the tape base 11 was torn, and the tear line hardly reached the chuck portion.

When the bag with a zipper of the present invention is formed, the bag making machine is a conventional bag making machine for thermally fusing the zipper tape T to the sealant layer 6 of the base film 4. As shown in FIG. 2, the shape of the seal bar 20 is adjusted so as not to seal the outside of the seal bar on the opening side.
The end of the tape base 11 may be formed as a bar having a width small enough to make it non-thermally fused. Thus, the present invention can be implemented only by changing the shape of the seal bar,
There is no cost increase factor other than the change of the seal bar.

[0015]

The present invention will be described more specifically. As the base film 4 of the bag, a biaxially stretched nylon film (ON) having a thickness of 15 μm and a linear low-density polyethylene film (L-LDPE) having a thickness of 40 μm are bonded using a urethane-based two-component curing adhesive. A combined base film 4 was produced.

The obtained base film 4 is 140 mm wide and 220 m long by using a four side seal type bag making machine.
m bag. The width of each of the four sides was 8 mm. In the bag making process, a pair of male and female zipper tapes were supplied and heat-sealed to a predetermined position on the inner surface of the bag by a seal bar 20 as shown in FIG. In order to prevent the fitting portion from being crushed by the seal bar, the portion corresponding to the fitting portion 10 was sealed using a seal bar having a recessed portion (space portion 21). That is, at the time of thermal fusion, the tape bases 11 at both ends of the fitting portion 10 of the chuck tape are thermally fused, and immediately below the fitting portion 10,
The base film 4 and the tape base 11 are not heat-sealed.
Was separated. However, the sealing portion of the bag and the intersection 2 of the chuck tape were heat-sealed. The width of the chuck tape is 13mm, and there is a fitting part of about 1.8mm width at the center of the tape base. Therefore, on both sides of the fitting portion 10, there is a tape base 11 of about 5.5 mm. In the heat-sealing by the seal bar for heat-sealing the tape base 11, the seal width on the side of the content storage section was 6 mm, and the width of the concave portion was 3 m.
m and a fixed width, and the seal width on the opening side was set to three conditions of 4 mm, 5 mm, and 6 mm. Therefore, the tape base 11 on the opening portion side
A non-heat-sealed end of 1.5 mm 0.5 mm 0 mm (that is, no non-heat-sealed end is formed) is formed between the end of the base film 4 and the base film 4.

The bags with the chucks under the above three conditions were each opened in 100 bags. The bag was opened by tearing with strong force from V notches 3 provided on the left and right seals on the opening side of the bag. This opening test confirmed whether the tear due to the tear propagated to the tape base and the tape base was torn. Table 1 shows the results.

The width of the seal on the opening side of the tape base 11 is 4 mm.
In some cases, when the tape base was torn violently, the tape base could tear, but the results were clearly better than those of 6mm. In the case of the same 5mm, the tape is slightly meandered at the time of bag making, so that the end of the tape base may be heat-sealed. The two conditions, that they are effective for prevention, overlap, and data between 4 mm and 6 mm are shown.

[0019]

According to the present invention, when the bag with the zipper is opened, the trouble of tearing from the unheated portion to the tape base of the zipper of the zippered bag is greatly reduced. The present invention does not require a special manufacturing apparatus, and can be implemented by changing the shape of the tape-based heat-sealing seal. * Study with Happu Fuki Fudo. Various winds are blowing. The road is still far from shaking each time. But don't stop trying to do that, but you'll never establish a steadfastness.

[Brief description of the drawings]

FIG. 1 is a view showing an embodiment of a bag with a zipper of the present invention,
(A) Front view, (b) XX section sectional view, (c) Y section enlarged sectional view

FIG. 2 is a cross-sectional view showing heat fusion of the zipper tape according to the embodiment of the present invention.

FIG. 3 is an enlarged cross-sectional view of a heat-sealed portion of the chuck tape;
(A) Example of the present invention, (b) Conventional example

FIG. 4 is a cross-sectional view for explaining the configuration of the material (base film) of the bag of the bag with a zipper according to the present invention.
3 layers

[Description of Signs] P bag T Chuck tape 1 Seal portion of bag 2 Intersection between seal portion of bag and chuck tape portion 3 V notch 4 Base film 5 Base layer 6 Sealant layer 7 Intermediate layer 8 Adhesive layer 10 Fitting Part 11 Tape base 12 Non-heat-fusion part immediately below the fitting part 13 Non-heat-fusion end part 14 Housing part-side heat-fusion part 15 Opening-side heat-fusion part 20 Heat-sealing seal bar 21 Space part of seal bar

Claims (1)

[Claims] 1. A bag having a heat-sealing surface facing each other and heat-sealing a peripheral portion thereof, wherein a tape base provided with a male fitting strip and a tape base provided with a female fitting strip are connected to the male base. In a bag with a zipper for heat-sealing the respective tape bases to the heat-sealing surface of the bag at a position where the mold-fitting line and the female-type mating line fit, at least opening of the tape-base heat-sealing A bag with a zipper, wherein a non-heat-fusion end is provided at a side end.