JP2001278290A - Paper bag with pleat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paper bag with a pleat whose mouth part can be sealed either manually or automatically after the same is filled with a sachet filled with sugar or salt or with a powder body or a grain body as contents. SOLUTION: This relates to a paper bag with a pleat whose at least one end part forming a mouth part of a tube body 12 with the pleat is provided with a closing flap 15, and whose other end is closed for forming a bottom closing part 13. On the wall face 12a of the tube body 12 where a closing flap 19 provided on the mouth part superimposes, an adhesive agent layer 20 covered with a release paper 21 is provided. At least on the edge of the paper 21 adhered to the layer 20, a handle 21a for removing the paper is formed. After filling contents, the paper 21 is peeled from the layer 20 using the handle 21a, and then the flap 19 is folded at a predetermined folding line h to be superimposed on the layer 20 to adhere to and to seal the mouth part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pleated paper bag, and more particularly, to a pleated paper bag which can be closed by a manual or automatic sealing machine after contents are put into the pleated paper bag through the mouth. With paper bag.

[0002]

2. Description of the Related Art Hitherto, a foldable paper bag mainly made of kraft paper and having a stepped end is called a pinch bag and is widely used internationally and is very well known. . Such a pleated paper bag or pinch bag generally has the following structure.

That is, a pleated cylindrical body mainly made of kraft paper and having both ends formed by step cutting is used as a basic constituent element, and a hot melt adhesive (hereinafter simply referred to as a hot melt) is attached to a step surface at one end thereof. ) Is applied, folded at a predetermined position and bonded to form a closed bottom portion. Next, hot melt is applied to the stepped surface at the other end of the pleated tubular body to be the mouth end, and cooled and solidified.

When using the pinch bag constructed as described above, the contents are filled from the mouth, and then the mouth of the pinch bag is sealed by a sealing machine called a top sealer. This top sealer is a hot-melt sprayed and cooled and solidified in advance on a stepped surface of a mouth portion of a pinch bag filled with contents to re-activate the hot melt and to re-activate the step-shaped mouth end at a predetermined position. This is an automatic sealing machine that is folded and bonded to the facing outer wall surface with the reactivated hot melt.

This pinch bag mainly made of kraft paper is excellent in leak-proof property and moisture-proof property, and has a symmetrical shape at the mouth and bottom so that the pinch bag can be piled up (overlapping when the pinch bags are laid down and stacked). Is also excellent. For this reason, they have been used for many years as the most excellent bags for transporting powders and granular materials.

[0006] The pleated paper bag is also used as an integrated packaging paper bag. Describing this integrated packaging paper bag, for example, pet food, sugar, salt, miso and the like are packed in relatively small polyethylene bags and retailed. Such polyethylene pouches containing sugar, salt and the like are put together in a gusseted paper bag in a state of being plurally assembled by each manufacturer, and delivered to a supermarket or the like.

As described above, this type of foldable paper bag used for packing a plurality of small bags of sugar, salt, and the like and transporting them to a supermarket or the like is referred to as an integrated packaging paper bag. . This accumulation packaging paper bag is used for so-called business use as described above,
It is usually formed from relatively thick kraft paper.

Conventionally, this type of integrated packaging paper bag has
A paper bag that can be easily opened as disclosed in Japanese Patent Publication No. 60-15543 is known. This stacked packaging paper bag basically has a gusseted cylindrical body formed by step cutting at both ends in a flat state, and a step surface at one end (bottom side) (the step surface becomes a closing flap). Bend the
It is configured such that a bottom closing portion is formed by adhesively closing with an adhesive applied to the surface.

On the other hand, a pressure-sensitive adhesive is applied in advance to the other end of the stacked packaging paper bag, that is, the surface of the flap located on the mouth side. Usually, such an integrated packaging paper bag is prepared by arranging and packing a predetermined number of small bags as contents from the mouth thereof, and then applying the flap with a pressure-sensitive adhesive applied to the flap surface of the mouth. Was folded and adhered to the opposing wall to close it.

[0010] As described above, the sealing of the mouth portion of the conventional integrated packaging paper bag is performed by packing a predetermined number of small bags therein and then bending the flap with the pressure-sensitive adhesive applied to the flap surface of the mouth portion. This sealing operation is performed by an automatic sealing machine.

[0011]

Conventionally, when a pinch bag is used for transporting powders, granules and the like, the contents are filled from the mouth, and then the pinch bag is placed on the step surface of the mouth of the pinch bag. It is necessary to blow hot air onto the hot melt that has been applied and cooled and solidified in advance to reactivate the hot melt and to bend the stair-shaped mouth end at a predetermined position, and to bond it to the facing outer wall surface with the reactivated hot melt. A spraying device was needed. In addition, there is a problem that it is not possible to seal manually without using such an automatic sealing machine.

[0012] A conventional pressure-sensitive adhesive is applied to the conventional packaging paper bag, but this adhesive is not only easily deteriorated but also easily adhered to other paper bags, and there is a problem in bag supply. .
In other words, since a plurality of bags are stacked and stacked, the paper bags are bonded to each other, and when the user automatically closes the bag, the bags must be supplied one by one. The problem is that the bag is supplied at the same time.

For this reason, the pinch bag does not require a hot-air blowing device for reactivating hot melt,
For integrated packaging paper bags, there is a strong demand for the development of pleated paper bags that are free from adhesive deterioration, do not cause blocking problems, and can be used for both automatic sealing and manual sealing. Was rare.

An object of the present invention is to solve such a conventional problem. For example, a small bag filled with sugar, salt, or the like, or a powder, a granular material, or the like is filled as a content. It is an object of the present invention to provide a foldable paper bag which can be sealed by an automatic sealing machine or manually.

[0015]

SUMMARY OF THE INVENTION According to the present invention, a pleated tubular body is provided with a closing flap at least at one end serving as a mouth and a closed bottom at the other end. In a paper bag, an adhesive layer covered with release paper is provided on the wall surface of a pleated cylindrical body on which a closing flap provided at the mouth overlaps, and at least an edge of the release paper attached to the adhesive layer After the release paper is removed, the release paper is removed from the adhesive layer using the handle after filling the contents, the flap is bent at a predetermined position, and the mouth is glued and sealed with the adhesive layer. It is characterized by doing.

In the foldable paper bag of the present invention, the pressure-sensitive adhesive layer covered with the release paper is constituted by a double-sided adhesive tape,
It is characterized in that the double-sided adhesive tape is attached to a predetermined position on the wall surface of the pleated cylindrical body. Further, in the foldable paper bag of the present invention, the bottom closing portion, which will be opened in the future, bends the other end of the foldable tubular body at least once, and this bent portion is not adhered to the foldable tubular body wall surface. It is characterized in that the bent portion is surrounded and fixed by a backing sheet with an opening tape in the state.

According to the pleated paper bag of the present invention, when the pleated paper bag is manually sealed after being filled with a small bag or the like, powder, granular material, etc., it is attached to the surface of the pressure-sensitive adhesive layer. Grab the release paper handle and pull it up to expose the adhesive layer. Next, the flap of the mouth is bent at a predetermined position, and attached to the pressure-sensitive adhesive layer.

When the foldable paper bag is sealed by an automatic sealing machine, the configuration of the conventional automatic sealing machine can be partially modified and used. That is, in the conventional automatic sealing machine, the flaps of the mouth portion of the paper bag, which is erected with the mouth portion up, in a state where the contents are filled with small bags or the like or powders, granules, etc., are sequentially folded to the opposite wall surface. It is to be glued.

As an improvement of such an automatic sealing machine, only a chuck device, that is, a gripping means is attached. With the use of the partially improved automatic sealing machine as described above, a pleated paper bag in a state in which the small bag or the like, which is the content, or a powdery or granular material is packed and the mouth is upright, is used in a pinch bag. The chuck device grips the handle provided at the end of the release paper while moving in the lateral direction, or in the case of the accumulated packaging paper bag, while temporarily stopping at an appropriate position.

Next, when the folded paper bag is continuously moved in the lateral direction, the release paper gripped at one end is peeled off with the lateral movement of the paper bag, and the flap at the mouth is bent from the moving direction side. The adhesive is adhered to the opposing wall surface and adhered to the peeled adhesive layer of the release paper. Or, while the fluted paper bag is temporarily stopped at an appropriate position, the release paper gripped at one end is peeled off, and then the flap at the mouth is bent and adhered to the opposing wall surface to peel off the release paper. Is adhered to the applied pressure-sensitive adhesive layer.

[0021]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a foldable paper bag according to the present invention. 1 to 4 show an embodiment in which the foldable paper bag of the present invention is applied to an integrated packaging paper bag (hereinafter simply referred to as a paper bag) 10. FIG. 1 is a perspective view showing an integrated packaging paper bag 10 according to an embodiment of the present invention in a state in which small bags as contents are packed.

FIG. 2 is a plan view showing the stacked packaging paper bag 10 shown in FIG. 1 in a flat state, and FIG. 3 is a sectional view taken along line 3-3 of the bottom closed portion of the integrated packaging paper bag 10 shown in FIG. FIG. 4 is a cross-sectional view schematically showing a vertical section of the pleated tubular body constituting the integrated packaging paper bag 10 shown in FIG. 2.

As shown in FIG. 1, a pleated cylindrical body 1 having both ends formed by step cutting and having a gusset 11 on both sides, as shown in FIG.
2 is comprised. That is, as shown in FIG. 4, the pleated tubular body 12 has a symmetrical structure in which the stair-cut structure at both ends is substantially the same, and the direction of the stair-cut surface is opposite. is there.

The gussets 11 formed on both sides of the pleated cylindrical body 12 are formed into a V-shape by flattening the middle part of the gusset along the longitudinal direction when flattened. Such a pleated tubular body 12 is a stitch-shaped sewing machine that is capable of forming a long strip-shaped paper sheet unwound from a roll in accordance with a conventionally performed method in a direction crossing the paper sheet at a predetermined length position. An eye is formed, the body is continuously adhered to form a pleated cylindrical body, and then cut at the perforation.

In the stacking and packaging paper bag 10 of this embodiment, one end of the above-described pleated tubular body 12 is closed to form a bottom closing portion 13, and the adhesive surface is protected on a predetermined wall surface with release paper. It is formed by providing a pressure-sensitive adhesive layer.
First, the structure of the bottom closing portion 13 of the stacked packaging paper bag 10 will be briefly described.

The bottom closing part 13 of the stacking paper bag 10
When forming the stepped end, the one end of the stepped section of the pleated tubular body 12 is slightly inside the lower edge 14 of the stepped opening as shown in FIG. ), The flap 15 is bent inward along a fold line h passing through.

Then, the folded flap 15 is
An opening tape 16 is surrounded by a backing sheet 17 adhered to the inner surface, and the backing sheet 17 is applied to the adhesive 1 applied to a predetermined position.
8, both wall surfaces 12a, 12b of the pleated tubular body 12
Glue to As a result, the bottom closing portion 13 of the stacked packaging paper bag 10 is formed.

Next, a description will be given of the structure on the mouth side of the stacking packaging paper bag 10. As shown in FIGS. 1, 2 and 4, the mouth flap 19 of the pleated tubular body 12 is formed.
Is folded at the fold line h when the mouth flap 19
The adhesive layer 20 (see FIGS. 1 and 2)
In FIG. 4, the shaded portion indicates the pressure-sensitive adhesive layer).

A release paper 21 is adhered to the surface of the pressure-sensitive adhesive layer 20 to protect the pressure-sensitive adhesive surface until the pressure-sensitive adhesive layer 20 is exposed for a predetermined function. As described above, the integrated packaging paper bags are packed by packing a predetermined number of small bags containing sugar, salt, etc. in a packed state, so that there is a concern that the contents leak from the gap in the sealed mouth. Not at all.

Therefore, the bent mouth flap 1
The pressure-sensitive adhesive layer 20 that fixes 9 to the opposing wall surface 12a does not need to have the same size as the mouth flap 19. What is necessary is an area (adhesive surface area) where an adhesive force can be obtained such that the mouth flap 19 is not easily peeled off from the facing wall surface 12a.
It just means that there is.

By the way, as a method of providing the pressure-sensitive adhesive layer 20 having the release paper 21 on the surface thereof on the wall surface 12a of the pleated tubular body 12, a double-sided adhesive tape having a predetermined width can be used. In this case, as shown in FIG. 2, the double-sided adhesive tape is cut slightly shorter than the width of the wall surface 12a of the pleated tubular body 12 to continuously manufacture the pleated tubular body 12 described above. In this case, one release paper can be peeled off and attached to a predetermined position of a paper sheet corresponding to the wall surface 12a.

Release paper 21 adhered to the surface of pressure-sensitive adhesive layer 20 (when the pressure-sensitive adhesive layer is provided using a double-sided adhesive tape as described above, the other release paper corresponds to this).
Has a handle 21a for removing release paper at one end thereof. The handle 21a formed at the end of the release paper 21
It can be configured in various modes.

For example, the handle 21a is shown in FIGS.
As shown in FIG. 5, one (one side) release paper of the double-sided adhesive tape cut into a predetermined width is peeled off, and one end of the adhesive layer 20 is partially peeled off slightly from the other (the other one side) release paper 21. It is folded back and attached to a predetermined position on the wall surface 12a in that state. In FIG. 2, a part of the end of the pressure-sensitive adhesive layer 20 that is folded back to form a double part is indicated by cross-hatching.

Thus, the release paper 21 attached to the surface of the pressure-sensitive adhesive layer 20 has one end protruding laterally from the folded portion of the pressure-sensitive adhesive layer 20. The protruding end of the release paper 21 functions as a handle 21a for removing the release paper. The handle 21a thus formed is
As shown in FIGS. 2 and 5, the release paper 21 is not limited to the widthwise end of the release paper 21 attached to the surface of the pressure-sensitive adhesive layer 20.

For example, as shown in FIG. 6, the corner of one end of the rectangular pressure-sensitive adhesive layer 20 is slightly folded back in a triangular shape, and is adhered to the wall surface 12a. One corner in the width direction of the release paper 21 attached may project in a triangular shape, and the triangular projection may be used as a handle 21a.

In each of the two specific examples described above, the handle 21a is formed at one end in the width direction of the release paper 21. However, as shown in FIG. (Width direction) may be protruded from the pressure-sensitive adhesive layer 20 in the same manner as described above to form the handle 21a.

Further, in the integrated packaging paper bag of the embodiment shown in FIGS. 2, 5 and 6, the method of forming the handle 21a of the release paper 21 attached to the surface of the adhesive layer 20 is as follows. A part of the release paper 21 was formed so as to substantially protrude from the pressure-sensitive adhesive layer 20 by folding a part of the release paper 20 to make it double.

However, in the integrated packaging paper bag of the present invention, a part of the release paper is protruded from the adhesive layer so that the handle 21 is formed.
The method of setting a is not limited to the above-described embodiment. For example, when making a cut line from the surface of the release paper on one side of the double-sided adhesive tape to the adhesive layer with a knife or the like, and applying this double-sided adhesive tape to the surface of the pleated cylindrical body, the release paper on one side At the same time, a part of the pressure-sensitive adhesive layer is removed at the same time by using the cut line.

When one side of the release paper is peeled off and the adhesive tape from which a part of the adhesive layer has been removed is attached to a predetermined position on the wall surface of the pleated cylindrical body, the other release paper covering the adhesive layer 20 The portion 21 covering the removed pressure-sensitive adhesive layer is substantially a handle 21a. As described above, the handle 21a formed on the release paper can also be formed by cutting off and removing a part of the adhesive layer.

In this case, if the position and shape of the pressure-sensitive adhesive layer to be cut and removed are devised, as shown in FIG. 1 and FIG. 2, or FIG. 6, or FIG. May be a handle 21a, a corner of one end of the release paper 21 in the width direction may be a triangular handle 21a, or a side edge along the longitudinal direction of the release paper 21 (the width direction of the paper bag) may be a handle 21a. it can.

Next, a method of using the stacked packaging paper bag 10 according to this embodiment will be described. According to the stacked packaging paper bag 10 of this embodiment, after manually arranging and packing a predetermined number of small bags in the paper bag, the release paper 21 affixed to the surface of the adhesive layer 20 can be manually sealed. Handle 2
1a is grasped and pulled up to expose the pressure-sensitive adhesive layer 20.

Next, the flap 19 at the mouth of the stacked packaging paper bag 10 is folded at the folding line h, and is attached to the adhesive layer 20 by being overlapped and pressed.
As a result, the mouth flap 19 is moved to the wall surface 1 by this adhesive.
2a, and the mouth is completely closed.
Further, when the stacking and packaging paper bag 10 is sealed by an automatic sealing machine, the configuration of the conventional automatic sealing machine can be partially modified and used.

As an improvement of such an automatic sealing machine, only a chuck device, that is, a gripping means is attached. With the use of the partially improved automatic sealing machine as described above, the stacked packaging paper bag in a state in which the contents are packed in a predetermined number of bags and the mouth is up, and temporarily stopped at an appropriate position. During this time, the chuck device grips the handle 21a provided at the end of the release paper 21.

Next, the release paper 21 whose one end is gripped is peeled off, and then the flap 19 at the mouth is bent and brought into close contact with the opposing wall surface 12a, and is superposed on the peeled adhesive layer 20 of the release paper 21. The mouth is closed by being adhered.

The above-described embodiment has been described by taking as an example an integrated packaging paper bag constituted by a pleated cylindrical body formed by stepwise cutting at the ends on the mouth side and the bottom side. It is needless to say that the attached paper bag is not limited to such an integrated packaging paper bag, but can be widely applied to a folded paper bag used for various applications.

Further, the foldable paper bag of the present invention may include a foldable tubular body whose end portions on the mouth side and the bottom side are cut straight. In this case, it is needless to say that it is necessary to separately attach a flap to at least the straight cut end on the mouth side.

[0047]

As described above, according to the foldable paper bag of the present invention, the pressure-sensitive adhesive layer protected by the release paper is provided on the wall surface region where the flap formed at the mouth overlaps when the flap is bent. By making the edge of this release paper slightly protrude from the pressure-sensitive adhesive layer and using it as a handle, the sealing with the mouth flap after filling the contents can be performed manually or by using a partially improved conventional automatic sealing machine. This can be done easily.

Moreover, in the foldable paper bag of the present invention, the conventional automatic sealing machine can be sealed with relatively easy improvement, so that the existing equipment can be used almost as it is. In addition, since it is possible to seal even by manual operation, for example, if this foldable paper bag is used as the above-mentioned integrated packaging paper bag, an excellent effect that the cost of packing and sealing small bags and the like is not significantly increased is also exerted.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an integrated packaging paper bag as one embodiment of a foldable paper bag of the present invention.

FIG. 2 is a plan view showing the stacked packaging paper bag shown in FIG. 1 in a flat state.

FIG. 3 is a cross-sectional view schematically illustrating a structure of a bottom closed portion, taken along a line 3-3, of the stacked packaging paper bag illustrated in FIG. 2;

FIG. 4 is a longitudinal sectional view schematically showing a structure of a pleated tubular body which is a component of the integrated packaging paper bag shown in FIG.

FIG. 5 is a cross-sectional view showing the state of the pressure-sensitive adhesive layer attached to the wall near the mouth and the release paper protecting the surface of the stacked packaging paper bag shown in FIG. 2 cut along line 5-5. FIG.

FIG. 6 is a partial view showing a state of an adhesive layer stuck to a wall surface near a mouth and a release paper for protecting the surface of an integrated packaging paper bag as another embodiment according to the foldable paper bag of the present invention. FIG.

FIG. 7 is a partial plan view showing a state of a pressure-sensitive adhesive layer stuck to a wall surface near a mouth and a release paper protecting the surface in an integrated packaging paper bag according to still another embodiment of the present invention. is there.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Stacked packaging paper bag 11 Town 12 Folded cylindrical body 12a One wall surface 12b The other wall surface 13 Bottom closed part 14 One edge of bottom-side stepped opening 15 Flap 16 Opening tape 17 Backing paper 18 Adhesive 19 Port Part flap 20 Adhesive layer 21 Release paper 21a Handle h Folding line

Claims (3)

[Claims] 1. A pleated paper bag provided with a closing flap at least at one end serving as a mouth of a pleated tubular body, and a closed bottom at the other end, wherein the bag is provided at the mouth. An adhesive layer covered with release paper is provided on the wall surface of the pleated tubular body on which the closed flap overlaps, and release paper is provided on at least an edge portion of the release paper attached to the adhesive layer. Forming a handle for removal, folding the flap in place after peeling the release paper from the adhesive layer using the handle after filling the contents,
A pleated paper bag, wherein the mouth is adhesively sealed by overlapping the pressure-sensitive adhesive layer. 2. The method according to claim 1, wherein the pressure-sensitive adhesive layer covered with release paper is formed of a double-sided adhesive tape, and the double-sided adhesive tape is attached to a predetermined position of the wall surface of the pleated tubular body. A pleated paper bag according to claim 1, characterized in that: 3. The bottom closed portion of the paper bag, which will be opened in the future, bends the other end of the pleated tubular body at least once, and folds the bent part on the pleated tubular wall surface. The foldable paper bag according to claim 1, wherein the folded portion is formed by being surrounded and fixed by a backing sheet with an opening tape in an adhered state.