JPH08133303A - Paper bag - Google Patents

Abstract

PURPOSE: To keep a cylindrical bag to be highly openable with a cut tape and to enable the bag to be used as a bag for taking out a small quantity of articles, by providing a synthetic resin zipper to open/close the bag freely, and a cut tape to tear open a paper patch, at the inside of the paper pad adhered to the opening of the bag. CONSTITUTION: A cut tape 5 is a synthetic resin tape higher in strength than a paper pad 2, and is adhered to the inside tip of one side of the paper pad 2. A cut 2a is formed on both sides of the tip of the paper pad 2, to which the cut tape 5 is adhered. To open the tip of the paper pad 2, the cut 2a is pulled with fingers, so that the tip of the paper pad 2 is torn off and opened until the zipper 4 can be opened. Thus, the bag is provided with a freely openable/closable zipper while maintaining the operability of the conventional bags provided with a cut tape.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper bag, and more particularly to a paper bag suitable for storing heavy items such as sugar, salt or feed.

[0002]

2. Description of the Related Art Conventionally, a so-called paper bag made of paper has been used for storing sugar, salt and the like, and the paper bag is relatively inexpensive and has a proper breathability. Because of its easy disposal, its use is wide in recent years. In such a paper bag, there are problems such as weak strength and inferior moisture resistance as compared with a synthetic resin bag.
Japanese Utility Model Publication Nos. 3-43157 and 5-44291 disclose paper bags having a multilayer structure with improved strength, and Japanese Utility Model Publication 5-44292 discloses moisture-proof property having an inner layer made of a synthetic resin film. Paper bags are disclosed.

Further, in order to make the unsealing work easier, in Japanese Utility Model Laid-Open No. 64-20451 and US Pat. No. 2,923,457, cover paper is covered across the opening. There is disclosed a paper bag in which a cut tape for opening is attached along the fold line of the patch paper. In use, the piece of paper that closes the opening is torn along the crease line by causing the end piece to which the cut tape is attached to tear, and this makes it easy to use without using any tools such as scissors. Can be opened.

On the other hand, as a usage mode of such a paper bag, not only are all the contents stored in the bag taken out at a time, but only a part of the contents is taken out and used.
There is a mode of use as a so-called dispensing bag. In the case of such use, in the conventional paper bag, it is dealt with by binding the opening of the paper bag containing the residue with a string or the like. There is a problem, especially in the case of salt, sugar, and pet food, quality deterioration and decay occur, and it is difficult to use as a dispensing bag.

As a countermeasure against this, a polyethylene bag for storing personal items such as candy and small items such as stationery is provided.
So-called fasteners may be used. This fastener has a projecting male portion and a female portion that elastically deforms and fits the male portion, and is formed integrally with the bag body at the opening of the polyethylene bag. In this polyethylene bag with a zipper, the tip side of the zipper can be cut off with scissors to open it, so that the zipper part can be opened and closed freely afterwards. It is possible to secure dustproofness.

[0006]

However, since this fastener needs to be elastically deformed, it is integrally formed of resin such as polyethylene together with the bag body,
When this is applied to the sealing band of the paper bag, the sealing band itself must be integrally molded with the fastener. However, the sealing band must be one that can be easily torn by the string for opening, and it is difficult to apply the structure of the resin bag as it is.

Therefore, a first object of the present invention is to provide a paper bag which can be used as a dispensing bag while maintaining the easy opening property by the cut tape. Also,
In order to increase the storage capacity of the bag, it has been widely practiced to form a so-called gusset in which the side surface of the bag is folded inward. When such a gusset is provided in a paper bag provided with a fastener, the end of the gusset, that is, the opening side is weak in strength, tears in the stored state, or damage when repeating opening and closing with the fastener. Cause. The second object of the present invention is, in addition to the above objects,
The purpose of the present invention is to provide a paper bag with little damage at the gusset end.

[0008]

[Means for Solving the Problems] The first object is to adhere a backing paper that straddles the opening of the tubular paper bag body and closes the opening, and to the inside of the backing paper, the paper bag is attached. The problem can be solved by a paper bag provided with a synthetic resin fastener that opens and closes the opening of the main body in an openable and closable manner, and an opening cut tape that tears the patch paper on the tip side of the fastener. Here, the attachment of the fastener to the backing paper may be either adhesion with an adhesive or sewing with a sewing machine, but since it is necessary to apply an adhesive for adhering to the main body of the paper bag on the inner surface of the backing paper, It is desirable to attach the fasteners by adhesion in terms of work process.

A second object is to form a gusset on the side surface of the paper bag body and to form step cut portions formed at both ends of the opening of the paper bag body from the paper bag body. The problem can be solved by bending it to the front surface side to form a reinforcing portion, and further enclosing the reinforcing portion with the above-mentioned patch paper.

[0010]

In the paper bag of the present invention, the cut paper itself which is torn with the cut tape is made of paper which is easy to tear as in the conventional case, and the cut tape is provided with the fastener made of synthetic resin. Further, it is possible to provide a fastener that can be opened and closed while maintaining the operability of the conventional paper bag. Further, the stepped portion is bent toward the surface side of the main body of the paper bag to form the reinforcing portion, and the reinforcing portion is surrounded by the patch paper, whereby the gusset end portion can be prevented from spreading during storage or opening.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The features of the present invention will be specifically described below with reference to the embodiments shown in the drawings. 1 is a perspective view showing a paper bag according to an embodiment of the present invention with a part thereof cut away, FIG. 2 is a front view of the paper bag shown in FIG. 1, FIG. 3 is a sectional view taken along line AA of FIG. 1, and FIG. 1 is a sectional view taken along line BB of FIG.

Referring to FIG. 1, reference numeral 1 denotes a cylindrical paper bag body having its end surfaces adhered by an adhesive agent, which is formed of two layers, an inner layer 1a and an outer layer 1b. One end (upper end in the drawing) of the paper bag body 1 is open, and the other end (lower end in the drawing) is bonded with a patch paper 2 that straddles the opening of the paper bag main body 1 and closes the opening. Numeral 3 is a gusset formed by folding both sides of the paper bag body 1 inward for increasing the storage capacity. On the inner surface of the backing paper 2, a synthetic resin fastener 4 for opening and closing the opening of the paper bag body 1 via an adhesive layer 7,
An opening cut tape 5 for tearing the backing paper 2 is provided on the tip side of the fastener 4.

FIG. 5 is a partial perspective view of the backing paper 2 of the paper bag and the fastener 4 joined thereto. As shown in FIG. 5, the fastener 4 has a base plate 8a and a protrusion 8b integrally formed on the male plate. The base portion 9a and the female portion 9 integrally formed with the elastic recessed portion 9b on the base plate 9a. The male portion 8 and the female portion 9 are provided on the inner surface of the patch paper 2 with the adhesive layer 7
Is attached through. This fastener 4 utilizes the elastic force of the elastic recessed portion 9b, and when it is closed, as shown in FIG.
As shown in FIG. 4, when the projection 8b of the male part 8 is pushed into the elastic recess 9b of the female part 9 and opened, the projection 8b can be easily opened and closed by pulling the projection 8b away from the recess of the elastic recess 9b. . By closing the fastener 4, moisture resistance, dust resistance, etc. can be ensured even after once opened.

The cut tape 5 is a synthetic resin tape having a strength higher than that of the patch paper 2, and as shown clearly in FIGS. 3 and 4, it is adhered to the inner surface of the tip of one surface of the patch paper 2. It is attached by the agent. As shown in FIG.
As shown in FIG. 1, when the tip of the patch paper 2 is opened, the cut paper 2 is cut as shown in FIG.
The front end of the backing paper 2 is unsealed so that the front end of the paper is torn and the fastener 4 can be opened and closed.

The gusset 3 is a fold formed by folding both side surfaces of the paper bag body 1 inward in order to increase the amount of the paper bag body 1 to be stored. Force particularly acts on the end portion of the gusset 3 and is easily broken when the end portion is torn or when the fastener 4 is repeatedly opened and closed.

In order to prevent such damage, as shown in FIG. 6 showing the manufacturing process, step cut portions 6 projecting from the end portion of the paper bag body 1 are provided at both end portions of the opening portion of the paper bag body 1. As shown in FIG. 7 showing the main part of the paper bag, the step cut portion 6 is bent to the other surface side of the paper bag body 1,
The patch paper 2 surrounds and adheres from above.

As a result, the end of the gusset 3 is always in close contact with the gusset 3, the end of the gusset 3 is not torn in the housed state, and is not damaged when the fastener 4 is opened or closed. It can also be used to lift a paper bag by inserting a finger into this reinforcing portion.

In the paper bag of this embodiment, the upper end side is left open, but this opening is filled with contents by the user and then sealed by hot melt or the like. Further, the above structure is not limited to the paper bag whose upper end side is open as in the present embodiment, and it is needless to say that the structure is applied to a paper bag sealed by adhesion or sewing.

[0019]

According to the present invention, the following effects can be obtained. (A) A cut tape for opening is provided on the inner surface side of the backing paper that closes the opening of the paper bag body, and a synthetic resin fastener is further provided on the inner surface side of the backing paper, thereby maintaining the ease of opening. It can be used as a dispensing bag. (B) By reinforcing the end of the gusset of the main body of the paper bag, the end of the gusset is not torn in the stored state, and is not damaged even when the fastener is opened and closed.

[Brief description of drawings]

FIG. 1 is a perspective view showing a paper bag, which is an embodiment of the present invention, by partially cutting it apart.

FIG. 2 is a front view of the paper bag shown in FIG.

FIG. 3 is a sectional view taken along line AA of FIG. 1;

FIG. 4 is a sectional view taken along line BB of FIG. 1;

5 is a partial perspective view of a backing paper of the paper bag shown in FIG. 1 and a fastener bonded to the backing paper.

6 is a front view showing a manufacturing process of the paper bag body shown in FIG. 1. FIG.

FIG. 7 is a partially cutaway perspective view showing a main part of the paper bag shown in FIG.

[Explanation of symbols]

 1 paper bag body 1a inner layer 1b outer layer 2 backing paper 2a cut 3 gusset 4 fastener 5 cut tape 6 step cut part 7 adhesive layer 8 male part 8a base plate 8b protrusion 9 female part 9a base plate 9b elastic recess

Claims (2)

[Claims] 1. A composite which adheres a backing paper which straddles the opening of the tubular paper bag body and closes the opening, and which opens and closes the opening of the paper bag main body on the inner surface side of the backing paper. A paper bag provided with a resin fastener and a cut tape for tearing the patch paper on the tip side of the fastener. 2. A gusset is formed on the side surface of the paper bag body, and step cut portions formed at both ends of the opening of the paper bag body and protruding from the paper bag body are bent toward the front surface side of the paper bag body for reinforcement. The paper bag according to claim 1, wherein a portion is formed, and the reinforcing portion is surrounded by the patch paper.