WO2005019052A1 - Plastic bag with zipper - Google Patents

Abstract

A plastic bag (10D), wherein an engageable/disengageable zipper (5) having a recessed part (7) and a projected part (8) is formed on the inside of the upper portion (14) of an opened bag body formed of plastic films (11) and (12), and both side portions (13) and (13) of the bag (10D) and the lower side portion (15) are fused, cutouts (35) and (35) are formed at both end parts of the upper portion (14) for opening, the upper portion (14) of the bag (10D) is openable by the zipper (5) and can be largely opened, a plurality of chambers may be formed by binding at least one sheet of thermal fusible plastic sheet between the films (11) and (12) or by vertically fusing the films (11) and (12) through lines.

Description

 Plastic bag with zipper

Technical field

 The invention relates to a plastic bag with a zipper, in particular a plastic bag.

 Light

The present invention relates to a plastic bag provided with a jig formed of a concave portion and a convex portion and releasably fitted inside an opening on the upper side of the plastic bag.

 Field background technology

 2. Description of the Related Art Various types of plastic bags have been conventionally provided with a zipper which is formed of a concave portion and a convex portion, and which can be released from the inside of an upper opening portion of a plastic film bag.

 As shown in Fig. 13, a typical example is to weld or cut off both sides of two plastic films 1A and 1B (see the hatched area 2 in Fig. 13 (C)). Is a welded portion), and a zipper 5 is provided at the upper side opening. As is well known (see FIG. 14), the zipper 5 is formed by integrally forming a concave portion 7 and a convex portion 8 on a plastic base portion 6.

The zipper 5 has a concave portion 7 and a convex portion 8 welded to each other at both ends 5a, 5a in a fitted state. Therefore, both ends 5a, 5a of the zipper 5 are fixed in a fitted state even when the zipper 5 is opened, and when resealing, the rear portion of the zipper 5 is started with the both ends 5a, 5a as a finger. Clasp and slide your finger while pressing to seal. By the way, in this type of conventional plastic bag, the area of the opening 3 when the zipper 5 is opened (the hatched portion in FIG. 13 (B)) becomes considerably small. In other words, the welding area is inevitably increased due to the large amount of resin in the portion where the zipper 5 is installed (see 2a in FIG. 13 (C)). 8 is caused by bulging inward. Therefore, the article that can be taken in and out from the opening 3 has a width D3 or less excluding the portion where the concave portion 7 and the convex portion 8 overlap at the time of opening from the dimension D2 smaller than the inner dimension D1 of the welded portion 2. It was limited to things.

 Also, due to the rigidity of the zipper 5, if the length of the zipper 5 is short, the opening 3 cannot be sufficiently opened, and a thin bag having a width dimension D of 4 O mm or less is actually manufactured. There was no. Disclosure of the invention

 Therefore, an object of the present invention is to provide a zipper-equipped plastic bag capable of storing articles larger than conventional ones by effectively utilizing the inner dimensions of the bag body. Another object of the present invention is to provide a zipper-equipped plastic bag that allows articles to be taken in and out even if the width is smaller than before.

 In order to achieve the above object, the present invention provides a plastic bag provided with a zipper formed of a concave portion and a convex portion on the inner surface of an upper side opening portion of a plastic film, the zipper being releasable. Both ends of the upper side opening of the body are open.

 In the plastic bag according to the present invention, since both ends of the upper opening of the bag are open, the upper opening of the bag can be greatly opened regardless of the presence of the zipper. It is possible to store articles larger than before by effectively utilizing the inside dimensions of the slab. Further, since the rigidity of the zipper is not restricted, a zipper-equipped bag having a width of 4 Omm or less, which has been conventionally regarded as a limit, for example, about 1 Omm in width can be put to practical use.

Furthermore, by using the fact that both ends of the bag are open and pulling out the cords and cables from the both ends, the electrical connection state can be maintained while the cords and cables are stored in the bag. Can maintain the excess of cables Can be collected compactly.

 In the plastic bag according to the present invention, since the two ends of the concave portion and the convex portion of the zipper are not welded to each other, there is no starting point when the concave portion and the convex portion are fitted as in the conventional bag. Therefore, in order to fit, the concave portion and the convex portion are visually opposed to each other, and the back portion of the zipper is pressed with a finger. Small bags can be sealed with a single press. If the bag cannot be sealed at once, it will be sealed while holding it several times.

 Further, the plastic bag according to the present invention may include a plurality of chambers. For example, a plurality of chambers can be formed by sandwiching at least one heat-sealable plastic sheet between the front film and the back film constituting the bag. A plurality of chambers can also be formed by welding the front film and the back film in a line in the vertical direction. Brief Description of Drawings

 FIG. 1 shows a state in the course of a manufacturing process of a plastic bag according to a first embodiment of the present invention, wherein (A) is a front view and (B) is a cross-sectional view.

 FIG. 2 shows a completed state of the plastic bag according to the first embodiment, wherein (A) is a front view and (B) is a sectional view.

 FIG. 3 shows a preparatory step for opening the plastic bag according to the first embodiment, in which (A) is a front view and (B) is a sectional view.

 FIG. 4 shows an opened state of the plastic bag according to the first embodiment, wherein (A) is a front view and (B) is a sectional view. '

 FIG. 5 shows a plastic bag according to a second embodiment of the present invention, wherein (A) is a front view, (B) is an XX cross-sectional view, and (C) is a XY cross-sectional view.

FIG. 6 is a sectional view showing the opened state of the plastic bag according to the second embodiment. FIG. 7 shows a step of extruding a plastic bag according to a third embodiment of the present invention, wherein (A) and (B) are cross-sectional views.

 FIG. 8 shows a melting step of the plastic bag according to the third embodiment, wherein (A) is a sectional view and (B) is a front view.

 FIG. 9 is a front view showing a plastic bag according to a fourth embodiment of the present invention. FIG. 10 is a perspective view showing a usage example of the plastic bag according to the fourth embodiment.

 FIG. 11 'is a perspective view showing an opened state of the plastic bag according to the fourth embodiment.

 FIG. 12 is a front view showing a plastic bag according to a fifth embodiment of the present invention.

 Fig. 13 shows a conventional plastic bag, (A) is a top view with the zipper closed, (B) is a top view with the zipper opened, and (C) is a front view.

 FIG. 14 is an explanatory diagram of a zipper including a concave portion and a convex portion. BEST MODE FOR CARRYING OUT THE INVENTION

 Hereinafter, embodiments of a plastic bag with a zipper according to the present invention will be described with reference to the accompanying drawings.

 (See the first embodiment, FIGS. 1 to 4)

 1 to 4 show a plastic bag 1OA with a zipper according to a first embodiment of the present invention.

 As shown in FIG. 1, this bag 10A first has two sides of plastic film 11 and 12 on both sides: L3, 13 and an edge of upper side 14 shown by oblique lines. To form a bag.

As the films 11 and 12, a single material that can be welded or a composite material in which at least the material that can be welded is laminated on the inner surface side is used. Also, A zipper 5 (see FIG. 14 for details) in which a concave portion 7 and a convex portion 8 are integrally formed on a plastic base portion 6 is welded to the inner surface of the upper side portion 14 of the lumps 11 and 12. I have. The zipper 5 may be formed integrally with the films 11 and 12.

 In a conventional plastic bag with a zipper, both side portions 13 and 13 are welded to the upper side portion 14 where the zipper 5 is provided, but in the bag 1OA according to the present invention. The upper regions 13 & and 13a of the side portions 13 and 13 are non-welded portions.

 Further, perforations 16 and small notches 17 are formed in the upper side portion 14 of the bag 1OA. The perforation 16 is for cutting off the welded portion of the upper side portion 14 when opening the bag 1OA, and the notch 17 is for starting the cutout. Into the bag 1 OA shown in FIG. 1, the contents P are inserted from the opened lower part 15, and the lower part 15 is welded as shown by hatching in FIG. . Thus, a plastic bag 10A with a zipper having the upper regions 13a and 13a opened is completed. '

 On the other hand, the user receives the bag 1 OA containing the stored items P in the state shown in FIG. In order to take out the stored items P from the bag 1 OA, first, as shown in FIG. 3, the welded portion of the upper side portion 14 is cut along the perforations 16 and the bag 1 OA is opened.

 Next, as shown in FIG. 4, the engagement between the concave portion 7 and the convex portion 8 of the zipper 5 is released, and the upper side portion 14 is opened on both sides. As a result, the upper side portion 14 of the bag 1 OA is turned outward and greatly opened. In this state, the stored item P whose upper end protrudes from the upper side portion 14 can be easily taken out, and can be stored again.

As described above, the bag 1 OA according to the first embodiment can be widely opened regardless of the presence of the zipper 5 because both ends of the upper side portion 14 are opened as non-welded portions (FIG. 4). ), The storage P that is almost the same width as the inside dimension D 1 of the bath 1 OA It is possible to insert.

 Conventionally, when the width D of the bag is reduced, it is difficult to open the upper portion 14 due to the rigidity of the zipper 5, but the width D of the bag 1OA is about 1 Omm. Can be opened.

 In this bag 1OA, the welded portions and perforations 16 provided in the upper side portion 14 are not necessarily required, and may be omitted. Further, if a small hole is provided in the welded portion of the upper side portion 14, it can be used as a bag for hanging display of goods.

 (See the second embodiment, FIGS. 5 and 6)

 5 and 6 show a plastic bag 10B with a zipper according to a second embodiment of the present invention.

 As shown in FIG. 5, the bag 10B has basically the same configuration as the bag 10OA shown as the first embodiment. Therefore, the same members and portions as those in FIGS. 1 to 4 are denoted by the same reference numerals, and redundant description will be omitted.

 A characteristic feature of this bag 10B is that at least one heat-sealable plastic sheet 18 is sandwiched between the films 11 and 12 on the front and back, and the inside of the bag 10B has at least two housings. It is divided into rooms 19a and 19b. As the sheet 18, a plastic film, a nonwoven fabric, a foamed plastic sheet, or the like can be used.

FIG. 6 shows a state in which the upper side portion 14 of the bag 10B is opened, and the upper end of the sheet 18 is located above the folded zipper 5 (the concave portion 7 and the convex portion 8). Stored items can be separately taken in and out of the respective storage chambers 19a and 19 through the wide open openings 20a and 20b. This bag 10B can be used, for example, as a storage bag for two CDs. If a non-woven fabric or a foamed plastic sheet is used as the sheet 18, the sheet 18 also functions as a cushioning material for CD. Further, the transparent film 11 or 12 of the bag 10B may be used as a printing surface. (Refer to the third embodiment, FIGS. 7 and 8)

 7 and 8 show a manufacturing process of a plastic bag 10C with a zipper according to a third embodiment of the present invention.

 First, as shown in FIG. 7 (A), the plastic film 30 is extruded into a tube shape from a die (not shown), and the concave portion 7 and the convex portion 8 constituting the zipper are simultaneously extruded to be integrally formed on the inner surface of the film 30. To protrude. By adjusting the amount of resin extruded from the die and the amount of air blown into the tube, the size of the bag and the thickness of the film 30 are determined. Next, the film 30 is folded so that the concave portions 7 and the convex portions 8 face each other (see FIG. 7 (B)).

 Thereafter, as shown in FIG. 8 (B), the folded film 30 is blown along a dashed-dotted line H while being conveyed by one step G in one direction (see arrow F). Also, as a pre-process for fusing, a cut 31 is formed in the upper side portion 14 of the film 30 and the cut portion is removed. The cut 31 is formed in order to open both ends of the upper portion 14. Note that perforations may be formed in the upper side portion 14. The plastic bag 10C with a zipper manufactured by the above-described process has basically the same configuration as the bag 1OA shown as the first embodiment, and its operation and effect are also similar to the bag 1OA. Is the same as

 (See the fourth embodiment, FIGS. 9 to 11)

 The plastic bag 1 OD with a zipper according to the fourth embodiment is designed to be used as a storage bag for cords of electric products such as a television, a personal computer, and an audio device, and a cape.

 That is, as shown in FIG. 9, this bag 1 OD has basically the same configuration as the bag 1 OA shown as the first embodiment, and the same members and portions as those in FIGS. The same reference numerals are given, and duplicate description is omitted.

The characteristic point of this bag 1 OD is that a relatively large notch 35 is formed at both ends of the upper side portion 14 to make it an open portion. Therefore, this bag As shown in FIG. 11, 10 D can open the upper side portion 14 considerably largely.

 Surplus cords and cables are messed up and left behind on the back of televisions, personal computers, and audio. Therefore, as shown in Fig. 10, the middle part of the surplus cords and cables is housed in the bag 1 OD and pulled out from the notch 35 to make the cords and cables electrically connected. It can be kept compact while maintaining it.

 A small hole 36 is formed in the welded portion of the lower side portion 15 of the bag 10D. The small holes 36 are used to suspend the bag 1 OD by hooking on pillars or wall projections.

 In the bag 1 OD, if the lower side portion 15 is made of a conventionally known gusset, the bottom portion can be made wider.

 (Refer to the fifth embodiment, Fig. 12 ')

 FIG. 12 shows a plastic bag 10E with a zipper according to a fifth embodiment of the present invention.

 This bag 10E has basically the same configuration as the bag 10OA shown as the first embodiment. Therefore, the same members and portions as those in FIGS. 1 to 4 are denoted by the same reference numerals, and redundant description will be omitted.

 The characteristic feature of this bag 10E is that longitudinally linear welds 41, 41 (shown by oblique lines) are formed on the front and back films 11, 12 and inside the bag 1 OE. That is, three independent storage chambers 42a, 42b, and 42c are formed.

 The effect of the bag 10E is the same as that of the bag 1OA, and the independent storage chambers 42a, 42b, and 42c can be selectively used.

 (Other embodiments)

The plastic bag with a zipper according to the present invention is not limited to the above embodiment, and can be variously changed within the scope of the gist. In particular, the cross-sectional shape of the convex part / recess part formed in the base part of the zipper is arbitrary. Regarding the bag, the bag making method is arbitrary, and the bag can be made to have an appropriate size according to the application. ■

 In addition, the second embodiment and the fifth embodiment can be combined to form a plastic bag having more storage chambers.

Claims

The scope of the claims 1. A plastic bag provided with a zipper that is formed of a concave portion and a convex portion and that can be released on the inner surface of the upper side opening portion of the plastic film bag, wherein at least both side portions of the bag are welded. Or a region where both ends of the zipper are located on both side portions of the bag body and are not welded.  Characterized by a plastic bag. 2. In a plastic bag provided with a zipper which is formed of a concave portion and a convex portion and which can be released on the inner side surface of the upper side opening of the plastic film bag, at least both side portions of the bag are welded. Or that the area where both ends of the zipper are located on both sides of the bag body is cut off,  Characterized by a plastic bag. 3. A plurality of chambers are formed by sandwiching at least one heat-sealable plastic sheet between the front film and the back film constituting the bag body. Plastic bag as described. 4. The plastic bag according to claim 3, wherein the heat-sealable plastic sheet is a nonwoven fabric or a foamed plastic sheet. 5. The end of the sandwiched heat-sealable plastic sheet on the side of the upper side opening is located outside the zipper when the upper side opening is opened. The plastic bag according to claim 4. 6. The plurality of chambers according to claim 1 or 2, wherein the front film and the back film constituting the bag body are welded in a line in the longitudinal direction to form a plurality of chambers. Plastic bag.