JP2005225542A - Packaging bag with zipper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a packaging bag with a zipper which can be easily discriminated whether or not the bag is opened. <P>SOLUTION: Two sheet parts 2 and 3 to constitute a packaging bag 1 are joined so as to be peeled at an interface at a position between zipper tapes 4 and 5 provided lower than an opening end 1a located at an upper end of the packaging bag 1 in an upright condition and the opening end 1a with such heat-sealing strength that the tapes can be manually peeled via a hot-melt type adhesive resin tape 6. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a packaging bag with a zipper.

As this type of conventional packaging bag with a zipper, there is one known from Patent Document 1, for example. That is, it has been known for a long time that an openable and closable zipper that is engaged with a male and female is integrally provided at an opposing position in the vicinity of the opening end of the bag.
Utility Model Registration No. 2557256

  In a packaging bag integrally provided with an openable / closable zipper as described in Patent Document 1 above, in the case of a packaging bag with a zipper that does not have a slider, most of the bags are close to the zipper Although the periphery including the side near the opening end of the existing bag is closed by heat sealing, the bag cannot be opened by opening the zipper unless the heat sealing part on the side near the opening end of the bag is cut. Some of the bags near the opening end of the bag where the zipper is nearby are not heat-sealed.In that case, the zipper can be opened easily at the store etc., and the bag can be opened easily. Even if it is opened, it cannot be determined whether it has been opened, and there is a management problem.

  Further, in the case of a packaging bag with a zipper having a slider, a zipper is provided at the opening end of the bag, and the slider is provided so as to be movable along the length direction of the zipper. It cannot be closed by heat sealing, and the packaging bag with a zipper having such a slider has a management problem as well.

  An object of the present invention is to solve such problems and to easily determine whether or not a zippered packaging bag has been opened.

  The packaging bag with a zipper according to claim 1 of the present invention constitutes the packaging bag at a position between the zipper tape provided at a position below the opening end positioned at the upper end in the state where the packaging bag is stood and the opening end. It is characterized in that it is bonded via a tape capable of interfacial peeling, delamination, or cohesive peeling with a heat seal strength that can be manually peeled between the two sheet parts.

  The packaging bag with a zipper according to claim 2 is characterized in that the height positions of the two sheet portions at the open end are shifted from each other.

  As described above, the packaging bag with a zipper of the present invention constitutes the packaging bag at a position between the zipper tape provided at the lower position with respect to the opening end located at the upper end in the state where the packaging bag is erected and the opening end. By joining the two sheets to make it possible to peel the interface with heat seal strength that can be peeled by hand, or to peel between layers, or to allow cohesive peeling, for example, the customer mistakenly connects the zipper tape and the open end. When the joint part in between is peeled, it can be confirmed that the packaging bag has been opened. In addition, since the height positions of the two sheet portions at the opening end are shifted from each other, the height between the two sheet portions at the opening end is equal to that between the two sheet portions at the opening end. Can be easily opened and the contents can be easily taken out.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
In the figure, reference numeral 1 denotes a three-side-seal type packaging bag in which the upper side is not heat-sealed and the other three sides are heat-sealed and closed at a position below the opening end 1a located at the upper end of the packaging bag 1. The male zipper tape 4 and the female zipper tape 5 are integrally provided on the inner surfaces of the sheet portions 2 and 3 on the front side and the back side (or the back side and the front side) by heat sealing.

  The sheet portions 2 and 3 constituting the packaging bag 1 have a two-layer structure in which the outer layers 2a and 3a are made of a nylon film and the inner layers 2b and 3b are made of a polyethylene film. A male zipper tape 4 and a female zipper tape made of polyethylene resin on inner layers 2b and 3b made of polyethylene film on the inner surface of each sheet portion 2 and 3 at a position below the opening end 1a of the bag 1 5 is joined.

  And, in the position between the zipper tapes 4 and 5 and the open end 1a in the state in which the packaging bag 1 is erected, one of the inner layers 2b and 3b of the sheet portions 2 and 3 (the embodiment shown in the drawing). In the form, a hot-melt adhesive resin tape 6 is provided on the inner surface of the inner layer 2b). The hot-melt adhesive resin tape 6 is bonded to the inner surface of the inner layer 2b of the sheet portion 2 by heat sealing at a temperature of, for example, 180 degrees, a sealing time of 1 second, and a sealing pressure of 0.2 MPa. As a result, the hot-melt adhesive tape layer and the polyethylene film of the inner layer 2b of the sheet part 2 are bonded with a heat seal strength of about 5 N / 15 mm. That is, the hot-melt adhesive resin has a property of adhering to a polyolefin resin such as polyethylene when heated, and the heat seal strength of the polyolefin resin is such that it can be easily peeled by hand (5 N / It has been proved by experiments that it is about 15 mm. Then, the hot melt adhesive resin tape 6 is bonded to the inner layer 3b of the sheet portion 3 by heat sealing at a temperature of, for example, 180 degrees, a sealing time of 1 second, and a sealing pressure of 0.2 MPa, as described above. Thereby, the hot-melt adhesive resin tape 6 and the polyethylene film of the inner layer 3b of the sheet part 3 are bonded with a heat seal strength of about 5 N / 15 mm. FIG. 2 shows a state where the sheet portions 2 and 3 are joined via the hot-melt adhesive resin tape 6.

Moreover, the packaging bag 1 of this Embodiment has shifted the height position of the two sheet | seat parts 2 and 3 in the opening end 1a mutually about 2-3 mm.
When filling the packaging bag 1 with the contents, the lower end side of the packaging bag 1 in an upright state is left without heat sealing, the two sides on both sides are heat sealed, and the zipper tape 4, 5 and the opening end 1a are joined with the hot melt adhesive resin tape 6 between the sheet portions 2 and 3, and the packaging bag 1 is turned upside down so that the lower end side which is not heat-sealed faces upward. In this state, the contents are filled from the lower end side that opens, and then the lower end side that opens is heat-sealed and closed. Reference numeral 7 denotes a heat seal portion on three sides around the packaging bag 1.

  In the above configuration, the two sheets constituting the packaging bag 1 at a position between the opening end 1a and the zipper tapes 4 and 5 provided below the opening end 1a located at the upper end in the state where the packaging bag 1 is stood. Since the sheet portions 2 and 3 are joined so as to be able to be peeled at the interface with a heat seal strength that can be peeled by hand through the hot-melt adhesive resin tape 6, for example, the customer accidentally opens the zipper tapes 4 and 5. When the junction part between the ends 1a is peeled off, it can be confirmed that the packaging bag 1 has been opened. Further, since the height positions of the two sheet portions 2 and 3 at the opening end 1a are shifted from each other, the height of the two sheet portions at the opening end is equal to 2 at the opening end 1a. It becomes easy to open between the sheet portions 2 and 3, and the contents can be easily taken out.

  When the contents are taken out from the packaging bag 1, the joint between the hot melt adhesive resin tape 6 and any one of the sheet portions 2 or 3 is peeled by hand and the zipper tape 4, 5 is opened to open the packaging bag. 1 is fully opened and the contents can be removed.

  By the way, various types of hot-melt adhesive resins are known. In this embodiment, for example, ethylene / ethyl acrylate copolymer mainly composed of ethylene / vinyl acetate copolymer manufactured by Hirodine Co., Ltd. is used. What was formed with the resin composition which consists of coalescence and a petroleum resin, a turpentine resin, and at least 1 type of resin chosen from the group which consists of rosin type resin is used.

In the embodiment described above, the packaging bag 1 is a three-sided seal type bag, but it can also be applied to a bag of a gusset type, a palm type, a stand pack type, or the like.
In the above embodiment, the sheet portions 2 and 3 are joined to each other at a position between the zipper tapes 4 and 5 and the opening end 1a so that the sheet portions 2 and 3 can be peeled by hand, so that the interface can be peeled. It may be bonded so that delamination is possible or cohesive peeling is possible. For example, as a hot melt type adhesive resin used for the cohesive peeling, a polyolefin resin known as VMX (registered trademark) manufactured by Mitsubishi Chemical Co., Ltd. as a main component and graft modified with a radical polymerizable monomer is used. A multi-component polymer containing an amorphous vinyl polymer homogeneously and a resin obtained by polymer-alloying a dispersion phase in which styrene is dispersed in polyolefin are suitable.

  Further, as a means for joining the sheet portions 2 and 3 at a position between the zipper tapes 4 and 5 and the opening end 1a so that the sheet portions 2 and 3 can be easily peeled with a heat seal strength that can be peeled by hand, both the sheet portions 2 and 3 are used. For example, a tape made of a resin containing a material in which a linear low density polyethylene resin and a polybutene-1 resin are randomly blended can be bonded to the inner surface of the sheet with an adhesive. When the tapes are bonded together by heat sealing, the bonded portions are not completely bonded, and the bonded portions can be easily agglomerated and separated by hand.

  In short, the sheet portions 2 and 3 may be joined at a position between the zipper tapes 4 and 5 and the opening end 1a with a heat seal strength that can be easily peeled by hand, and interposed between the sheet portions 2 and 3. The material to be made is not limited to the above.

  Moreover, in the said embodiment, although the packaging bag 1 is a product made from the synthetic resin made by the sheet | seat parts 2 and 3 of 2 layer structure which outer layer 2a, 3a consists of a nylon film and inner layer 2b, 3b consists of a polyethylene film, The material is not particularly limited. That is, if the material of the packaging bag 1 is made of a synthetic resin film such as a polyethylene film or a polypropylene film because at least the inner layer is necessary for heat sealing, the material laminated on the outer side of the inner layer is other than the synthetic resin. For example, aluminum foil, paper, rayon paper, etc. may be used.

It is sectional drawing which shows the state before joining between the 2 sheet | seat parts of the packaging bag in one embodiment of this invention. It is sectional drawing which shows the state after joining between the two sheet | seat parts of the packaging bag. It is a perspective view of the packaging bag in the state which fills the packaging bag with the contents. It is a perspective view of the packaging bag after filling the packaging bag with the contents. It is a principal part enlarged view which shows the state which opens an open end in order to take out the contents from the packaging bag.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Packaging bag 1a Open end 2,3 Sheet part 2a, 3a Outer layer 2b, 3b Inner layer 4,5 Zipper tape 6 Hot-melt-type adhesive resin tape 7 Heat seal part

Claims (2)

Heat to the extent that the two sheets constituting the packaging bag can be peeled by hand at a position between the zipper tape provided at the lower side of the opening end located at the upper end in the state where the packaging bag is erected and the opening end. A packaging bag with a zipper, which is bonded through a tape that can be peeled at the interface with a sealing strength, peelable between layers, or peelable by cohesion. The packaging bag with a zipper according to claim 1, wherein the height positions of the two sheet portions at the open end are shifted from each other.

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