JP3257296B2 - Paper bag - Google Patents

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 which can be easily opened and has contents.
Can be used as a dispensing bag to take out and use a part of
The present invention relates to a paper bag suitable for storing heavy objects such as sugar, salt or feed.

[0002]

2. Description of the Related Art Conventionally, so-called paper bags made of paper have been used for storing sugar, salt, and the like. These paper bags are relatively inexpensive, have a moderate air permeability, and Due to its ease of disposal, its use is wide in recent years. In such a paper bag, the strength is weaker than a bag made of a synthetic resin, and problems such as inferior in moisture resistance are cited.
Japanese Utility Model Publication No. 3-43157 and Japanese Utility Model Publication No. 5-44291 disclose paper bags having improved strength as a multilayer structure, and Japanese Utility Model Publication No. 5-44292 discloses a moisture-proof property having an inner layer made of a synthetic resin film. Are disclosed.

[0003] Further, as an apparatus which facilitates the opening operation, Japanese Utility Model Application Laid-Open No. 64-20451 and US Patent No. 2,923,457 disclose a cover paper straddling the opening. A paper bag to which a cut tape for opening is attached along a fold line of the backing paper is disclosed. In use, the cut tape causes the tab to be attached to the end, causing the patch to close the opening torn along the fold line, thereby making it easy to use without any scissors or other instruments. Can be opened.

[0004] On the other hand, such a paper bag is used not only in such a way that all the items stored in the bag are taken out at once, but also that 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 a conventional paper bag, measures are taken by tying 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.

[0005] As a countermeasure, polyethylene bags or the like are provided for storing accessories such as candy and small articles such as stationery.
The use of so-called fasteners is conceivable. The fastener includes a male part having a protruding shape and a female part which elastically deforms and fits the male part, and is formed integrally with the bag body at the opening of the polyethylene bag. In this zippered polyethylene bag, the tip side of the zipper can be cut off with scissors or opened from the notch, so that it can be freely opened and closed with the zipper part, and the contents are dispensed. By closing the zipper afterwards, moisture resistance, dust resistance and the like can be ensured.

[0006]

However, since this fastener needs to be elastically deformed, it is integrally formed with a 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 formed with the fastener. Sealing band and
To integrally mold the fastener, at least the inside of the bag
The layer is made of a material that can heat seal the fastener
In this case, the sealing band must be open.
It can be easily torn by the sealing string (cut-up)
It will not be possible. Therefore, easy opening is maintained.
For paper bags that you want to hold,
Cannot be applied directly .

Accordingly, a first object of the present invention is to provide a paper bag which can be used as a dispensing bag while maintaining easy opening with a 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 terms of strength, which may cause breakage in a stored state or breakage when repeatedly opening and closing with the fastener. Cause. Further, a second object of the present invention, in addition to the above objects, further comprises:
It is an object of the present invention to provide a paper bag that has less damage at the end of the gusset.

[0008]

A first object of the present invention is to bond a backing paper which straddles the opening of the tubular paper bag body and closes the opening, and attaches the paper bag to the inner side of the backing paper. 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 so as to be able to open and close, and an opening cut tape that tears the backing paper at a tip end side of the fastener. Here, the attachment of the fastener to the backing sheet may be performed by bonding with an adhesive or sewing, but it is necessary to apply an adhesive for bonding to the paper bag body on the inner surface of the backing sheet. It is desirable in the work process that the fastener is also attached by bonding.

A second object of the present invention is to form a gusset on a side surface of the paper bag main body, and to form a stepped portion formed at both side ends of the opening of the paper bag main body so as to protrude from the paper bag main body. The problem can be solved by forming a reinforcing portion by bending the reinforcing portion toward the front surface, and further surrounding the reinforcing portion with the backing paper.

[0010]

In the paper bag of the present invention, the backing sheet itself torn by the cut tape is made of paper which can be easily torn as in the past, and the backing sheet is provided with a fastener made of synthetic resin to provide the cut tape. In addition, it is possible to provide a conventional paper bag provided with a fastener that can be freely opened and closed while maintaining the operability. Further, the step-cut portion is bent toward the surface side of the paper bag body to form a reinforcing portion, and the reinforcing portion is surrounded by the backing sheet, so that the gusset end portion can be prevented from spreading at the time of storage or opening.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The features of the present invention will be specifically described below based on embodiments shown in the drawings. FIG. 1 is a perspective view showing a paper bag according to an embodiment of the present invention partially cut away, FIG. 2 is a front view of the paper bag shown in FIG. 1, FIG. 3 is a cross-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 main body having an end face adhered with an adhesive, and 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 main body 1 is open, and a backing paper 2 that covers the opening of the paper bag main body 1 and closes the opening is adhered to the other end (lower end in the drawing). Reference numeral 3 denotes a gusset formed by folding both sides of the paper bag body 1 inward to increase the storage amount. On the inner surface side 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 sheet 2 of the paper bag and the fastener 4 joined thereto. As shown in FIG. 5, the fastener 4 has a male base plate 8a integrally formed with a projection 8b. And a female part 9 in which an elastic concave part 9b is formed integrally with a base plate 9a. The male part 8 and the female part 9
Attached through. When the fastener 4 is closed by utilizing the elastic force of the elastic concave portion 9b, the fastener 4 shown in FIGS.
As shown in FIG. 4, when the projection 8b of the male portion 8 is pushed into the elastic recess 9b of the female portion 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 and the like can be ensured even after once opened.

The cut tape 5 is a synthetic resin tape having a strength greater than that of the backing paper 2, and is adhered to the inner surface of the leading end of one side of the backing paper 2 as clearly shown in FIGS. Attached by the agent. As shown in FIG. 1, both ends of the leading end of the backing paper 2 to which the cut tape 5 is attached are attached.
As shown in FIG. 1, a cut 2a is formed. When the leading end of the patch 2 is opened, the portion of the cut 2a is picked up with a finger and pulled, so that the patch 2 shown in FIG.
Is torn, and the leading end of the backing paper 2 is opened so that the fastener 4 can be opened and closed.

The gusset 3 is formed by folding both sides of the paper bag main body 1 inward to form a fold in order to increase the storage capacity of the paper bag main body 1. The gusset 3 has a direction in which the folds are stretched by the stored items. Intensively acts on the end of the gusset 3 in particular, and the end is easily broken when the end is torn or when the opening and closing with the fastener 4 is repeated.

In order to prevent such damage, as shown in FIG. 6 showing the manufacturing process, stepped portions 6 protruding from the ends of the paper bag main body 1 are provided at both ends of the opening of the paper bag main body 1. The stepped portion 6 is bent toward the other side of the paper bag main body 1 as shown in FIG.
From above, it is surrounded and adhered by the backing paper 2.

As a result, the ends of the gussets 3 are always in close contact with each other, so that the ends of the gussets 3 do not break in the stored state, and are not damaged when the fasteners 4 are opened and closed. It can also be used to insert a finger into this reinforcement to lift the paper bag.

In the paper bag of this embodiment, the upper end is left open, but this opening is filled with contents by a user and then sealed with hot melt or the like. Further, the above structure is not limited to a paper bag having an open upper end as in the present embodiment, but may be applied to a material sealed by bonding 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 sheet that closes the opening of the paper bag body, and a synthetic resin fastener is provided on the inner surface side of the backing sheet, thereby maintaining the ease of opening, It can be used as a dispensing bag. (B) By reinforcing the ends of the gussets of the paper bag main body, the ends of the gussets are not broken in the stored state, and are not damaged when the fastener is opened and closed.

[Brief description of the drawings]

FIG. 1 is a perspective view of a paper bag according to an embodiment of the present invention, which is partially cut away.

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;

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

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

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Paper bag main 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 Projection 9 Female part 9a Base plate 9b Elastic recess

Continuation of the front page (56) References JP-A-4-215955 (JP, A) JP-A-5-35669 (JP, U) JP-B-50-5115 (JP, B1)

Claims (2)

(57) [Claims] 1. A composition for bonding a backing paper straddling an opening of a tubular paper bag main body and closing the opening, and closing an opening of the paper bag main body on the inner surface side of the backing paper so as to be openable and closable. A paper bag comprising: a resin fastener; and an opening cut tape for tearing off the backing paper at a tip end side of the fastener. 2. A gusset is formed on a side surface of the paper bag main body, and a stepped portion formed at both side ends of the opening of the paper bag main body and protruding from the paper bag main body is bent toward the surface of the paper bag main body for reinforcement. 2. A paper bag according to claim 1, wherein a portion is formed, and the reinforcing portion is surrounded by the backing paper.