JPH08143048A - Paper bag - Google Patents

Abstract

PURPOSE: To prevent a content from dropping out at the time of unsealing, and facilitate the unsealing work by a method wherein a sealing part is formed in such a manner that the opening is folded into a zig-zag state, and the opening end of a cylindrical bag main body is folded twice so that the terminal opening may face the opposite side from the bag main body, and a sealed part is wrapped and bonded with a backing paper on which a cut tape for unsealing is arranged. CONSTITUTION: For a cylindrical paper bag main body 1 of which the end surfaces are bonded with an adhesive, the upper end is folded into a zig-zag state consisting of first and second folded parts 2, 3, and the terminal opening is made a sealed part by making it face the opposite side from the bag main body. Then, a backing paper 4 is bonded across the opening of the paper bag main body 1 so that the backing paper 4 may wrap the sealed part. The backing paper 4 is bent into a V-shape from the approx. center in the longitudinal direction, and an adhesive layer 6 is provided on the whole surface of the internal surface. At the same time, first and second cut tapes 7a, 7b, being in parallel with each other, in order to tear off the backing paper 4 are bonded at the approx. center of one of the surfaces of the backing paper 4, along a folding line at the center of the surface of the adhesive layer 6. By this method, the unsealing of the sealed part is facilitated.

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 and 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. Problems with such paper bags include weaker strength and inferior moisture resistance compared to synthetic resin bags.
No. 43157 and Japanese Utility Model Publication No. 5-44291,
Paper bag with improved strength as a multi-layered structure
No. 44292 discloses a moisture-proof paper bag having an inner layer made of a synthetic resin film.

Further, in order to make the unsealing work easier, Japanese Utility Model Laid-Open No. 64-20451 and U.S. Pat. No. 2,923,457 apply the bag over the opening of the bag body. There is disclosed a paper bag which is covered with paper and to which a cut tape for opening is attached along the fold line of the patch paper.

When the paper bag is opened, the end piece to which the cut tape is affixed causes the strip to tear the patch paper which closes the opening along the crease line.
As a result, it is possible to easily open the package without using any tool such as scissors.

FIG. 9 is a longitudinal sectional view showing a main part of the paper bag described in Japanese Utility Model Publication No. 5-44291 and Japanese Utility Model Publication No. 5-44292. In the figure, 50 is an inner layer cylindrical body made of a synthetic resin film, 51 is a paper cylindrical body, 52 is a paper outer layer cylindrical body, and the respective edges of the cylindrical bodies 50 and 52 are aligned and combined in a line. The end portion is bent once with a predetermined length to form a first-time bent portion 53a, which is further folded inward to form a second-fold bent portion 53b, thereby forming the bent portion 53 twice. Further, a patch paper 54 is arranged on the upper surface of the bent portion 53 so as to surround the bent portion 53, and the edge portion of the patch paper 54 is placed on the outer cylindrical body 52.
Is adhered to the surface of the adhesive with an adhesive material 55. Reference numeral 56 is a cut tape for opening provided on the inner surface of the backing paper 54.

As described above, the opening end is bent twice and the upper surface of the bent portion 53 is covered with the patch paper 54, whereby the patch paper 54 is torn by pulling up the cut tape 56 while maintaining a high sealing property. Further, the folded portion 53 can be opened again by returning it.

[0007]

However, in the above-mentioned paper bag, since the first folding part 53a is folded inward, the first folding part 53a and the two-folded bending part 53b form the opening part when opening. When returning to the top, the contents such as sugar, salt, and feed that have entered the inside of the bag body 2 times into the bent portion 53b,
It easily falls to the first bent portion 53a and falls outside,
This is a big problem in factories that use a lot of paper bags.

Further, in the paper bag of the publication, the edge portion of the backing paper 54 surrounding the bent portion 53 is replaced by the outer layer cylindrical body 52.
When the adhesive tape 55 is fixed to the surface of the sheet, and the unsealing is performed, the cut tape 56 fixed near the bending line of the first-time bending portion 53a is pulled up to tear the patch paper 54. For this reason, even after tearing the backing paper 54 along the cut tape 56, both end portions of the bent portion 53 are still adhered, and in order to return the folded portion 53, the cut tape 56 must be pulled up. It is necessary to further strip off the backing papers 54 on both ends of the bent portion 53. An object of the present invention is to solve the above problems in the conventional paper bag, and an object thereof is to provide a paper bag in which the contents are not dropped at the time of opening and the opening work is easy.

[0009]

The present invention has been proposed in order to achieve the above object, and is characterized by the configuration of a cut tape for opening and a sealing portion. That is, according to the present invention, the opening portion of the tubular bag body is folded over, and the open end of the tubular bag body is bent twice so that the end opening faces the opposite side to the bag body and sealed. There is provided a paper bag characterized in that the sealing portion is surrounded and adhered by a patch paper which forms a portion and has cut tapes for opening which are located above and below the sealing portion. Here, in order to further improve the airtightness, the sealing portion may be temporarily adhered to the surface of the tubular paper bag body.

[0010]

[Operation] By folding the opening of the tubular bag body and bending the opening end of the tubular bag body twice so that the end opening faces the opposite side to the bag body, a sealing portion is formed. After peeling off the backing paper, the sealing portion can be raised just by pulling up the double-folded bent portion in the same state, that is, with the opening facing upward. Also,
By disposing cut tapes for opening located on the upper and lower parts of the sealing part on the backing paper that covers the sealing part, only by pulling up these cutting tapes, the sealing part is in an unrestrained state, that is, standing. Can be raised.

[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 of a paper bag according to an embodiment of the present invention, FIG. 2 is a front view of the paper bag shown in FIG. 1, FIG. 3 is a partial perspective view of a backing paper adhered to the paper bag shown in FIG. 1, and FIG.
2 is a sectional view taken along the line AA of FIG. Referring to FIG. 1, reference numeral 1 denotes a tubular paper bag main body having an end surface bonded with an adhesive, and an upper end of the paper bag main body 1 has a folded portion formed by a first folded portion 2 and a second folded portion 3. Then, a sealing portion is formed so that its end opening faces the opposite side to the bag body, and further, the patch paper 4 is spread over the opening portion of the paper bag body 1 so as to surround the sealing portion. It is glued.

The backing paper 4 is made of the same material as that of the bag body 1, and both sides of the backing paper 4 are projected from the bag body 1 to form the tabs 5 for opening. Further, as shown in FIG. 3, the adhesive layer 6 is formed in a V shape by being bent from substantially the center in the longitudinal direction, and an adhesive layer 6 is provided on the entire inner surface side thereof. Further, a first cut tape 7a for tearing the backing paper 4 is provided along the center fold line on the surface of the adhesive layer 6, and a second cut tape 7b is provided in parallel with the first cut tape 7a. The backing paper 4 is adhered to one surface of the backing paper 4 at approximately the middle thereof. As shown in FIGS. 1 and 4, the distance between the first cut tape 7a and the second cut tape 7b is the distance between the upper portion and the lower portion of the sealing portion.

Therefore, when the upper part of the bag body 1 is surrounded by the patch paper 2, one surface of the patch paper 2 is adhered to the back surface side of the bag body 1 as further clearly shown in FIG. On the other surface side of 2, the sealing portion composed of the first bent portion 2 and the second bent portion 3 is surrounded from the upper surface, and below it is adhesively fixed to the front surface side of the bag body. In FIG. 4, 8 is
A temporary adhesive layer provided on the surface of the bag body 1 and the surface of the first bent portion 2, and on the surface of the first bent portion 2 and the second bent portion 3, whereby the first bent portion 2 surface and the first bent portion 2 surface. Although the bent portion 2 of 1 can be fixed, it can be easily peeled off manually.

FIG. 5 is an explanatory view showing a process of forming the first bent portion 2 and the second bent portion 3, and as shown in the figure, first, the first bent line is bent so that the opening is downward. The first bent portion 2 in the facing state is formed, and then the second bent portion 3 having the opening portion facing upward is formed by performing a valley fold from the second fold line 3a. The formation of these bent portions 2 and 3 can be automated in the conventional manufacturing process. To open the paper bag, as shown in the perspective view of FIG. 6, by lifting the tab 5 of the backing paper 4,
First cut tape 7a, second cut tape 7b, and further, first cut tape 7a and second cut tape 7
A part 4a of the backing paper between b is peeled off, whereby the sealing portion including the first bent portion 2 and the second bent portion 3 is brought into an unrestrained state.

As described above, in the paper bag of this embodiment,
By arranging the cut tapes 7a and 7b for opening located on the upper and lower parts of the sealing portion on the backing paper 2 which covers the sealing portion, the pick-up piece 5 is lifted and the cut tapes 7a and 7b are simply pulled, As described above, the sealing portion can be brought into a non-restrained state, that is, a startable state without requiring any other work. In this state, by pulling up the second bent portion 3 upward, the sealing portion can be raised with the opening portion facing upward.
Therefore, even if the contents in the bag body 1 have entered the first bent portion 2, the bag body 1 does not spill out to the outside as in the conventional case, but rises from the first bent portion by being started up. Can be put back in. As described above, in the paper bag of this embodiment, the contents do not drop when opened, and the opening work is easy.

In FIG. 7, a part 4a of the patch paper 4 is in the second position when opened.
FIG. 7 is a perspective view showing a state in which the bent portion 3 is attached and remains on the surface. To avoid this situation, for example,
As shown in FIG. 8, on one surface of the backing paper 4, that is, the surface on which the cut tapes 7a and 7b are provided, the adhesive layer 6 is provided only on both end portions, that is, the portions to be the knob pieces 5, By forming the non-adhesive portion 9 in the portion in contact with the bent portion 3, it is possible to more smoothly peel off.

[0017]

According to the present invention, the following effects can be obtained. (A) After peeling off the backing paper, the sealing part can be raised just by pulling up the double-folded bent part upward with the opening facing away from the bag body, that is, the upper part. The contents will not drop when opened. (B) By disposing cut tapes for opening located on the upper part and the lower part of the sealing part on the backing paper covering the sealing part,
Just pulling up the cut tape makes it ready to start up, which makes opening work easier.

[Brief description of drawings]

FIG. 1 is a perspective view of a paper bag according to an embodiment of the present invention.

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

FIG. 3 is a partial perspective view of a backing paper adhered to the paper bag shown in FIG.

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

FIG. 5 is an explanatory view showing a manufacturing process of the paper bag shown in FIG.

6 is a perspective view showing an opened state of the paper bag shown in FIG. 1. FIG.

7 is a perspective view showing an opened state of the paper bag shown in FIG. 1. FIG.

FIG. 8 is a perspective view showing another embodiment of the backing paper.

FIG. 9 is a vertical cross-sectional view showing a main part of a conventional paper bag.

[Explanation of reference numerals] 1 paper bag body 2 first folded portion 2a first folded line 3 second folded portion 3a second folded line 4 patch paper 5 picking piece 6 adhesive layer 7a first cut tape 7b second cut tape 8 Temporary adhesive layer 9 Non-adhesive part

Claims (2)

[Claims] 1. A sealing portion is formed by bending an opening of a tubular bag body and bending the opening end of the tubular bag body twice so that its end opening faces the opposite side to the bag body. Then, a paper bag in which the sealing portion is surrounded and adhered by a backing paper provided with cut tapes for opening located at the upper and lower portions of the sealing portion. 2. The paper bag according to claim 1, wherein the sealing portion is temporarily adhered to the surface of the tubular paper bag body.