WO2004050493A1

WO2004050493A1 - Plastic fastener tape and bag using it

Info

Publication number: WO2004050493A1
Application number: PCT/JP2002/012726
Authority: WO
Inventors: Shingo Ishizaki
Original assignee: Ishizaki Shizai Co., Ltd.
Priority date: 2002-12-04
Filing date: 2002-12-04
Publication date: 2004-06-17
Also published as: AU2002354396A1

Abstract

A pair of plastic fastener tapes (10) having protrusions (12) and recesses (13) formed to fit each other removably on the side face at the base parts (11, 11). The base part (11) is bent to the protrusion (12) side and the recess (13) side, respectively, below the protrusion (12) and the recess (13). Outer side face of the base parts (11, 11) and the inner side face at the opening (21) of a bag (20) are welded and the upper part of the base parts (11, 11) projects above the opening (21). The base parts (11, 11) of the pair of fastener tapes (10) are provided with a closing slider (30) for fitting the protrusions (12) and the recesses (13).

Description

Technical Field Plastic zipper tape and bag provided with the zipper tape

The present invention relates to a plastic zipper tape provided at an opening of a bag body and a bag provided with the zipper tape. Background art

Conventionally, a bag 1 is known as a plastic bag as shown in FIG. This bag 1 is made by welding a plastic film and cutting or fusing the sides, and can be disengaged from the opposing inner surfaces of the pair of flaps 3, 3 located in the opening 2. A zipper tape 8 including a concave portion 8a and a convex portion 8b is provided.

A slider 9 for closing the concave portion 8a and the convex portion 8b of the zipper tape '8 is attached to the opening 2 of the bag 1. By sliding the slider 9 in one direction, the concave portion 8a and the convex portion 8b are pressed from the outside and fitted together. To open the opening 2, the flaps 3, ₃ may be grasped by hand and pulled to both sides to forcibly release the engagement between the recess 8 a and the protrusion.

Japanese Patent No. 288716771 (Document 1) discloses a slider for opening and closing a zipper tape provided at an opening of a bag. Further, a slider dedicated to closing is disclosed in Japanese Patent No. 3190298 (Reference 2).

In the open / close slider disclosed in the above-mentioned Document 1, the middle leg piece for releasing the fitting of the uneven portion of the zipper extends below the uneven portion. The slider does not come off from the opening because it extends and is locked to the uneven portion.

However, the slider 9 dedicated to closing as shown in FIG. 5 does not have a middle leg piece extending below the concave / convex portion, and even if there is a middle leg piece, it is located in the lateral direction of the bag (arrow B in FIG. This is to prevent the slider 9 from coming off, and the outside of the opening 2 of the plastic bag 1 is black, so that the slider 9 tends to come off as indicated by the arrow A. Had a point.

In addition, if the contents of the bag are granular or powdery, the bag comes into contact with the concave portion 8a ゃ the convex portion 8b of the zipper tape 8.

In addition, since the slider 9 slides while contacting the outer surface of the bag 1, depending on the material of the bag 1, slippage may be poor and the slider 9 may not be used. For example, if a heat-welded material is laminated on the inner surface, a paper or cloth bag can be obtained on the outer side, but these are difficult to use because the slider 9 slides poorly. Disclosure of the invention

Therefore, an object of the present invention is to effectively prevent the slider from coming off the opening of the bag, and to reduce the possibility that the contents of the bag come into contact with the turning part and the convex part of the zipper tape, Another object of the present invention is to provide a zipper tape that can make the slider slide smoothly.

Another object of the present invention is to effectively prevent the slider from coming off the opening of the bag and reduce the possibility that the contents of the bag come into contact with the concave and convex portions of the zipper tape. Another object of the present invention is to provide a bag capable of improving the sliding of the slider. In order to achieve the above object, a first invention is directed to a pair of plastic zipper tapes each having a recess and a protrusion which can be fitted to and released from each other on a side surface of a base portion. It is characterized by being bent to the concave side or the convex side below the concave or convex part.

It is sufficient that at least one of the pair of base portions is bent, but both of the pair of base portions are bent to the concave side and the convex side below the respective concave and convex portions. I like it.

In the plastic zipper tape having the above configuration, the inner surface of the opening of the bag is welded to the outer surface of the bent portion of the base portion.

'It can be attached to the bag. In this case, since the lower portion of the base portion is bent inward, the lower portion of the slider is locked at the bent portion, and the slider is prevented from coming off. In addition, since the bent portion intervenes from the bag storage part, the structure is difficult to open.

In addition, when the concave portion and the convex portion are fitted, the bent portion of the base portion is close to or in close contact with the base portion, so that the possibility that the contents of the bag contact the concave portion and the convex portion is reduced. Furthermore, since the slider slides along the outer surface of the plastic base, the slider slides smoothly even on paper or cloth bags with a heat-sealed material laminated on the inner surface. is there.

According to a second aspect of the present invention, a bag body is formed of a material having a weldable plastic film on at least an inner surface thereof with one side being an opening, and the bag can be fitted to and released from the inner surface of the opening. In a bag to which a pair of plastic zipper tapes each having a concave portion and a convex portion formed on a base portion, at least one base portion is bent toward the concave portion or the convex portion below the concave portion or the convex portion. The inner surface of the opening of the bag body and the outer surface of the bent portion of the base portion are welded. Also in this bag, at least one of the pair of base portions may be bent, but both of the pair of base portions are bent toward the concave side and the convex side below the respective concave and convex portions. I prefer doing it. Also in the bag having the above configuration, since the plastic zipper tape according to the first invention is used, the same function and effect as those of the first invention are exerted. In particular, in the case of this bag, when the bag itself is held by hand, it is convenient to place a finger on the bent portion of the base portion so that the bent portion stops slipping.

In other words, the bag according to the second invention is characterized in that the upper portion of the base portion including the uneven portion of the zipper tape projects outward from the opening of the bag body, and the back side of the base portion is exposed. . In a conventional bag, the back side of the zipper tape was covered with a bag film as shown in FIG. 5 (B). The fact that the base portion of the zipper tape projects from the opening of the bag means that the base portion functions as a flap portion, which greatly contributes to the advantages of the invention such as the slipperiness of the slider. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a perspective view showing a bag provided with a plastic zipper tape according to the present invention,

FIG. 2 shows the zipper tape, (A) is a sectional view in a fitted state, (B) is a sectional view in a released state,

FIG. 3 is a cross-sectional view showing a state where the zipper tape is fitted with a slider.

FIG. 4 shows the slider, (A) is a side view, (B) is a front view, (C) is a bottom view,

Figure 5 shows a bag with a conventional plastic zipper tape, (A) is a perspective view, and (B) is a sectional view of a main part. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, an embodiment of a plastic zipper tape according to the present invention and a bag provided with the zipper tape will be described with reference to the accompanying drawings. FIG. 1 includes a plastic zipper tape 10 according to the present invention. The bag 20 is shown. This bag 20 is manufactured by basically the same manufacturing process as the conventional plastic bag 1 shown in FIG. 5, and a zipper tape 10 is attached to the upper opening 21. . In Fig. 1, the welded portions a and b on the side and lower sides during bag making are shown with diagonal lines.

As shown in FIG. 2, the zipper tape 10 has convex portions 12 and concave portions 13 that can be fitted and released from each other formed on base portions 11 and 11, respectively. The base portions 11 and 11 are bent below the convex portion 12 and the concave portion 13 toward the convex portion 12 and the concave portion 13. The zipper tape 10 is integrally formed by extrusion using a weldable plastic such as polypropylene or polyethylene.

FIG. 2 (A) shows a state in which the projections 12 and the depressions 13 are fitted, and FIG. 2 (B) shows a state in which the fitting is released. During this fitting, the lower portions (bent portions 11a, 11a) of the base portions 11, 11 are bent to positions adjacent to each other.

In the zipper tape 10, the inner surface of the opening 21 of the bag 20 shown in FIG. 1 and the outer surface of the bent portion 11a are welded. That is, the zipper tape 10 is attached with the upper part 1 1 13 of the base portion 1 1, 1 1 1 and the lib projecting upward from the opening 2 1 of the bag 2 0 and exposed, and the upper part 1 1 b, 1 1 b constitutes the flap of bag 20. On the other hand, as shown in FIGS. 3 and 4, the closing-only slider 30 has a pair of side leg pieces 31, 31 located outside the base portions 11, 11, and a pair of base legs 31, 31. And a middle leg piece 35 of a length that is located inside the base portions 11 and 11 and cannot reach the convex portion 12 and the concave portion 13.

The slider 30 is attached to the zipper tape 10 in the state shown in FIG. 3, and by sliding in any direction along the zipper tape 10, the side leg pieces 31 and 31 are attached. The projections 32, 32 formed inside the zipper tape press the projections 12 and the depressions 13 of the zipper tape 10 into each other so that they fit. The projections 3 3, 3 3 formed on the lower end of the side leg pieces 3 1, 3 1 engage with the steps of the bent portions 1 1 a, 1 1 a of the base portion 1 1, 1 1, and the slider 30 is raised It is prevented from coming off.

To open the bag 20, slide the slider 30 to one end of the bag 20, grasp the upper part 1 1 b, 11 b of the zipper tape 10 by hand and pull it to both sides (Refer to arrows C and C in Fig. 1), the protrusions 12 and M 13 are forcibly released.

In the bag 10 provided with the zipper tape 10, since the lower portions of the base portions 11 and 11 of the zipper tape 10 are bent inward, the bent portions 11 a and 11 a The protrusions 33, 33 of the slider 30 are locked to prevent the slider 30 from being detached upward.

On the other hand, even if a force acts in the direction of opening the convex portion 12 and the concave portion 13 from the storage portion of the bag 20, the opening force is reduced due to the interposition of the bent portions 11 a and 11 a. It is difficult to transmit to 2 and recesses 1 and 3 and does not open easily.

In addition, when the convex portion 12 and the concave portion 13 are fitted with each other, the bent portions 11a, 11a of the base portions 11, 11 are close to or close to each other (see Fig. 2 (A) Fig. 3). ), Even if the contents of the bag 20 are granular or powdery, the possibility of contact with the projections 12 and the depressions 13 is reduced. In addition, the slider 30 is a case where the bag 20 is made of paper or cloth laminated with a heat-sealed material on the inner surface because the bag 20 is slid along the outer surface of the plastic base portions 11 and 11. The sliding of the slider 30 is good.

In addition, when holding the bag 20 by hand, if a finger is placed on the bent portions 11a, 11a of the base portions 11, 11, the bent portions 11a, 11a are slipped. It is convenient as it stops. Further, since there is no film constituting the bag on the back side of the convex portion 12 and the concave portion 13, the pinching strength by the slider 30 is set to an optimum state without being affected by the thickness of the film. can do.

The plastic zipper tape and the bag according to the present invention are not limited to the above embodiment, but can be variously modified within the scope of the gist.

For example, the zipper tape 10 may be provided with two convex portions 12 and concave portions 13 in order to ensure airtightness.

Industrial applicability

As described above, the plastic zipper tape according to the present invention and the bag provided with the zipper tape can prevent the slider dedicated for closing from coming off from the opening of the bag, and the contents of the bag can be prevented from coming off the zipper tape. It can reduce the risk of contact with uneven parts and can make the sliding of the slider better, making it ideal for bags that store articles in an almost airtight state.

Claims

The scope of the claims

1. A pair of plastic zipper tapes each having a recess and a protrusion which can be fitted and released from each other on a side surface of a base portion, wherein at least one base portion has a recess or a protrusion below the recess or the protrusion. Bend to the side

A zipper tape made of plastic.

2. The plastic zipper tape according to claim 1, wherein the pair of base portions are bent to the concave side and the convex side below the respective concave and convex portions.

3. A bag body is formed of a material having a weldable plastic film on at least an inner surface thereof, with one side being an opening, and a recess and a recess which can be fitted and released to each other on the inner surface of the opening. In a bag to which a pair of plastic zipper tapes each having a convex portion formed on a base portion is attached, at least one base portion is bent to the concave side or the convex side below the concave portion or the convex portion,

That the inner surface of the opening of the bag and the outer surface of the bent portion of the base portion are welded;

Characterized by a bag. .

4. The bag according to claim 3, wherein an upper portion of the base portion including the convex portion and the convex portion protrudes from an opening of the bag body to form a flap portion.

5. The bag according to claim 3, wherein the pair of base portions are bent to the concave side and the convex side below the respective concave and convex portions.

6. The bag according to claim 3, wherein a slider dedicated to closing the concave and convex portions is fitted to base portions of the pair of zipper tapes.