JPH0126599Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a bottom-pasted bag for heavy-duty packaging that does not use decorative paper and is easy to open while ensuring sealing performance.

[Prior art and its problems]

Conventionally, in order to form the bottom pasting overlapping part of a bottom pasting bag without using decorative paper, a vertical cut 5 reaching the diagonal fold line 2 from the opening edge is cut in advance as shown in FIG. A non-folding piece 6 is formed between the diagonal folding line 2 and the diagonal folding line 2, and the non-folding piece 6 is not folded in when folding the diagonal folding line folding part A method is used in which the non-folded pieces 6, 6 are extended outside the x and y areas, and then glued together with the second horizontal fold line folded portions y, y superimposed, and these non-folded pieces 6, 6 are overlapped.

However, since the bottom patch of conventional bottom-stick bags for heavy-duty packaging uses only glue with a reliable adhesive property, although the sealing performance is sufficient, there is a problem in that the bag is difficult to open.

In addition, as in Utility Model Publication No. 59-19537, a method of gluing the bottom part to make it easier to open is also used, but with this method, it is difficult to maintain the sealing property. I can't.

Furthermore, as in Japanese Utility Model Application Publication No. 57-180644, a method has been proposed in which a release agent is applied on top of the adhesive to make it easier to open, but this method still has the problem of increasing the cost of the release agent. .

[Means for solving problems and their effects]

In order to solve the problem that it is difficult to open the bottom part of the conventional heavy packaging bag of this kind, the present invention attaches a cut tape 9 to the upper second horizontal fold line fold part y, and uses the cut tape 9 to After cutting the two horizontal folding line folding portions y, the upper and lower second horizontal folding line folding portions y, y are glued using only easily peelable glues 7a and 8a.

By adopting such a configuration, a bag with a bottom that can be easily opened by cutting with the cut tape 9 is provided.

[Explanation of Examples]

Examples of the bottom pasted bag of the present invention will be described below.

In the drawings, Figure 1 shows the state before folding the second horizontal folding line folding part y, 1 is a cylindrical bag, 2 is a diagonal folding line, 3 is a first horizontal folding line, and 4 is a second horizontal folding line. , 5 is a vertical cut made in advance from the opening edge of the cylindrical bag toward the diagonal folding line 2, and a non-folding piece 6 is formed between the vertical folding line 2 and the diagonal folding line 2, as shown in FIG. This non-folding piece 6 is not folded in when folding the diagonal folding line folding part x.
The diagonal folding line continues to extend outside the area of the folding portion x of the conventional diagonal folding line.

7a and 7b are glues applied to the back side of the second horizontal folding line folding part y, which is the lower side, and the second horizontal folding line 4
Adhesive bonding glue 7b is used in the vicinity, and adhesive 7a, which is easily peeled off, is used in the other parts.

8a and 8b are glues applied to the back side of the second horizontal folding line folding part y on the upper side;
The adhesive bonding glue 8b is applied to the vicinity of the fold line and the areas near both sides of the cut tape 9 (to be described later), and the other parts are applied with an easily peelable adhesive 8b.

9 is a cut tape attached to the upper second horizontal fold line folding portion y.

The operation of the present invention will be explained below.

In the bottom pasted bag of the present invention, as shown in FIG. 3, a vertical cut 5 is made in advance from the opening edge toward the diagonal fold line 2, and a non-folded piece 6 is formed between the bag and the diagonal fold line 2.

When folding the diagonal folding line folding part x, the non-folding piece 6 is not folded in but is extended outside the area of the diagonal folding line folding part x.

This non-folding piece 6 remains as it is when folding the second horizontal folding line folding part x.
(Fig. 1), so when forming the bottom sticking part, they overlap each other as shown in Fig. 2.

When folding the lower second horizontal folding line folding part y, it is glued to the diagonal folding line folding part x on the opposite side of the first horizontal folding line 3 using easily peelable glue 7a.

However, it is preferable that the vicinity of the folded portion of the second horizontal folding line 4 be solidified with fixing glue a, a, and the vicinity of the folded portion be reinforced.

Next, fold in the second horizontal folding line folding part y, which will be the upper side. At this time, the outer periphery is glued with adhesive 8b for fixing.
On the other hand, the inside is glued with easily removable glue 8a.

When the cut tape 9 is pulled to unseal the bottom pasted bag of the present invention, the upper second horizontal fold line fold part y is cut along the cut tape 9 as a border as shown in FIG. The glue 8b remains fixed, but the upper and lower second folded portions y, y are glued only with the easily removable glue 8a, so they can be easily opened.

While the bottom pasted bag of the present invention is easy to open, when it is closed, the bottom pasted part is sealed with easy-to-peel glue 7a, 8a, and the second horizontal fold line folded part y on the upper side is joined for fixation on the outside of the back surface. Since the adhesive 8b sufficiently secures the adhesiveness of the decorative paper 7 to the bottom sticking part, the sealing performance is also good.

The above-mentioned easy-to-remove glues include glues made by adding wax to polyvinyl alcohol adhesives, glues made by mixing polyvinyl acetate with powders that do not have adhesive strength such as polyolefin, polystyrene, and calcium carbonate, and glues for fixing. As the bonding glue, conventionally known glues for bonding paper such as starch and polyvinyl acetate,
etc. are used.

The easily peelable adhesive material has a high shear strength with respect to the adhesive surface, but it is better to have a relatively low peel strength, and a peel strength of approximately 70 to 90 g/cm is preferable.

The bonding adhesive material for bonding has high shear strength and peel strength relative to the bonding surface.

Generally, the peel strength is about 200 to 250 g/cm.

The shear strength for both the easily peelable adhesive material and the fixed bonding adhesive material is preferably such that it causes material failure.

In addition, for paper bags with bottoms, paper such as kraft paper is mainly used as the bag material, and paper bags that are opened with glue to form the bottom of the bag, and in the case of multi-layer bags, the outer surface of the bag,
It is sufficient to provide a paper layer on the inner surface, and there is no problem even if the bag uses a plastic layer in the middle.

In addition, in the above embodiment, the case where adhesive bonding glue a, a was applied to the area near the second horizontal folding line 4 was explained, but the adhesive bonding glue a, a is not necessarily necessary in the area near the second horizontal folding line 4. Instead, as shown in FIG. 5, the adhesion bonding glues a and a in FIG. 1 may be replaced with release glue.

That is, the easily peelable glues 7a and 8a are extended to the second horizontal fold line 4.

[Effect of idea]

a. When the bag is closed, the bottom part is sealed with glue that is easy to peel off, so the sealing performance is sufficiently maintained, and when the bag is opened, pulling the cut tape 9 and cutting the upper second horizontal fold line fold part y makes it easy to peel off. Since only the overlapping second horizontal folding line folding portions y and y glued with the thick glue 8a are separated from the fixing glue 8b, the package can be opened easily.

[Brief explanation of the drawing]

Fig. 1: A plan view of the second horizontal folding line folding portions y, y of the bottom pasting bag of the present invention before folding, Fig. 2: A plan view of the bottom pasting portion after formation, Fig. 3: A plan view of the cylindrical bag 1. Perspective view, Fig. 4: A sketch when the bottom pasted bag of the present invention is opened, Fig. 5: An equivalent view of Fig. 1 when the fixing glue a is not used in the folded part of the second horizontal folding line 4, 1 : Cylindrical bag, 2: Diagonal horizontal fold line, 3: First horizontal fold line, 4: Second horizontal fold line, 5: Vertical cut,
6: Non-folding piece, 7a: Easy-to-peel glue applied to the back side of the second horizontal folding line folding part y on the lower side, 7
b: Adhesive glue applied to the back side of the second horizontal folding line folding part y, which is the lower side; 8a: Easy-to-peel glue applied to the back side of the second horizontal folding line folding part y, which is the upper side;
8b: Adhesive glue applied to the back side of the second horizontal folding line folding part y on the upper side, 9: Cut tape, x: Diagonal folding line folding part, y: second horizontal folding line folding part,
a: Bonding glue for fixing near the second horizontal fold line (first
figure).

Claims (1)

[Claims for Utility Model Registration] A vertical cut 5 reaching the diagonal fold line 2 from the opening edge is cut in advance to form a non-folded piece 6 between the vertical cut 5 and the diagonal fold line 2. The non-folding piece 6 is used both when folding the diagonal folding line folding section x and when folding the second horizontal folding line folding section y.
In the bottom pasting bag of the type in which the upper and lower second horizontal folding line folding parts y and y are overlapped, the second horizontal folding line folding part y on the upper and lower sides and the non-folding The back side of the piece 6 and the folded part x of the diagonal folding line are glued with easy-to-peel adhesives 7a and 8a, while the second horizontal folded part y on the upper side and the non-folded piece 6 extending from this are covered with cut tape 9.
, and the outside of the cut tape 9 is coated with a bonding glue 8b for fixing, and the second horizontal folding line folding part on the lower side is glued.