JP2000318749A - Bag body having drain hole, and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bag body which is easy in forming a drain hole at a position high in water draining effect and easy in manufacture, and its manufacturing method. SOLUTION: A first surface 11 and a second surface 12 are formed of a sheet 1 on which a heat-weldable cloth 3 is laminated on its outer surface, and an M-shaped folded portion 15 is formed on its boundary part. The first surface 11 is adhered to a first inner folded surface 16 are adhered to each other at a fold-joining portion 21, and the first inner folded surface 16 and a second inner folded surface 17 are heat-welded through the cloth 3. As a result, a non-adhered drain hole 26 is formed between the second surface 12 and the second inner folded surface 17.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bag which needs a drain hole, for example, a bag used for covering an end of a long material such as a pipe, a mold, a building material, etc. The present invention relates to a bag having a structure and capable of easily forming a drain hole, and a method for manufacturing the same.

[0002]

2. Description of the Related Art When storing and transporting long materials such as resin pipes such as vinyl chloride, metal pipes, shapes and building materials, a plurality of bundles are bundled, and the ends are covered with a bag. As this bag, a bag having an M-shaped folded portion at the bottom is preferably used. In the case of having the M-shaped folded portion, by expanding the folded portion at the bottom, it is possible to reliably insert the ends of a plurality of long materials bundled into the back of the bottom of the bag.

In this type of bag, it is necessary to form a drain hole for draining rainwater or the like entering the bag when the bag is installed outdoors.

[0004]

In the conventional bag body, the sheet is folded in two to form the M-shaped fold at the fold boundary, and the edges of the sheet are sewn using a thread. What is done is the main. However, with the sewing machine, the operation of manufacturing the bag is extremely complicated.

[0005] Further, since the drainage holes are formed by perforating the sheet forming the bag body, a process for forming the drainage holes is required, which increases the manufacturing cost. Further, in the case where the drainage hole is formed in the middle part of the bag, it may not be possible to reliably drain rainwater or the like that has entered the bag.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and provides a bag body and a method for manufacturing the bag body, which can easily form a drain hole at a position having a high draining effect and which is easy to manufacture. It is an object.

[0007]

According to the present invention, a sheet material is folded to form a first surface and a second surface, and both side edges of the first surface and the second surface are bonded to each other. In a bag body in which a folding boundary between the first sheet and the second sheet is a bottom, and a side opposite to the bottom is an opening, a boundary between the first surface and the second surface has a bottom. An M-shaped folded portion having a first inwardly folded surface inwardly folded from the first surface and a second inwardly folded surface inwardly folded from the second surface is formed, and both sides of the sheet material are formed. In the edge portion, the first surface and the first internally folded surface,
And the first surface and the second surface are bonded to each other except for the folded portion, and the opposite surfaces of the second surface and the second inner folded surface are formed as drain holes without being bonded. It is characterized by having.

[0008] Preferably, the first inner folding surface and the second inner folding surface are further bonded. In this case, the sheet material has a heat welding layer formed only on the outer surface opposite to the opposing surface of the first surface and the second surface, and the first inner folded surface and the second inner surface The folded surface can be made to be welded by the heat welding layer.

The heat-welding layer is a cloth material of a heat-welding resin such as polyethylene or polypropylene, or a resin film. The bag body forming the bag body of the present invention is made of a paper material such as kraft paper. Materials and resin films are laminated.

Next, the bag manufacturing method of the present invention comprises the steps of (a)
When the sheet-like packaging material is divided into a first surface and a second surface, a predetermined width is opened in the first surface, and from the edge thereof,
Applying an adhesive to an intermediate point between the first surface and the second surface; and (b) causing the first surface and the second surface to face each other;
And forming an M-shaped folded portion having a first inwardly folded surface inwardly folded from the first surface and a second inwardly folded surface inwardly folded from the second surface at the intermediate point. And (c)
The first surface and the first inner fold surface, and the first surface and the second surface other than the folded portion are adhered by the adhesive, and the second surface and the second inner fold are bonded. Forming a drainage hole that is not bonded to the surface facing the surface, and (d) bonding the first internally folded surface and the second internally folded surface. Things.

In the above, it is preferable that the sheet material has a heat-welded layer formed only on the outer surface opposite to the opposing surface of the first surface and the second surface, and the step (d) is performed. In the method, the first inner folded surface and the second inner folded surface are welded by the heat welding layer.

[0012]

FIG. 1 is a perspective view of a bag of the present invention, FIG. 2 is a perspective view showing a state in which the end of a long material is covered with the bag,
FIG. 3 is a partially enlarged perspective view showing an M-shaped folded portion of the bag body,
4 to 6 are perspective views showing a manufacturing method of the bag, and FIGS. 7 and 8 are side views showing an adhesive structure of the bag.

A bag 10 shown in FIG. 1 is formed of a sheet material 1 and has a first surface 11, a second surface 12,
Joint 1 where both side edges of both sides 11 and 12 are joined
3 and 13. In the bottom part 14, the sheet material 1
Thus, an M-shaped folded portion 15 is formed. In the folded portion 15, a first internally folded surface 16 folded from the first surface and a second internally folded surface 17 folded from the second surface 12 are formed, as shown in FIG. The cross section is M-shaped.

The bag 10 has an opening 18 on the side opposite to the bottom 14. As described later, in the bag body 10, drainage holes 26 (see FIG. 3) are formed at the folding joints 21 and 21 on both sides of the folding part 15. Further, drain holes 22 are formed in the first surface 11 and the second surface 12 as needed.

As shown in FIG. 2, in a state where a long material W such as a vinyl chloride pipe is bundled, an end of the long material W is covered and protected by a bag 10. At this time, since the M-shaped folded portion 15 is expanded at the bottom portion 14, the end of the long material W can be reliably inserted to the bottom portion 14 of the bag body 10. As shown in FIG. 2, long materials W are stacked and stored or transported in a state of being covered with the bag body 10.

When installed outdoors, rainwater is applied to the bag 10
This rainwater enters the inside of the folding joint 2.
The water is discharged from the drain holes 26 formed in the drain holes 1 and 21 and the drain hole 22. In particular, since the drainage holes 26 are formed in the foldable joints 21 and 21 on both sides of the bottom part 14, rainwater and the like that has penetrated into the back of the bag body 10 are effectively discharged from the bleedout holes 26 of the foldable joints 21 and 21. Is discharged.

The bag body 10 of the present invention can be obtained by only folding the sheet material 1 and joining the folded sheets together.
A drain hole 26 can be formed in the first hole.

The details of the structure of the bag 10 of the present invention and the method of manufacturing the same will be described below. The bag 10 of the present invention is formed from a band-shaped sheet material 1 as shown in FIG. As shown in FIG. 3, FIG. 5, and FIG. 6, the sheet material 1 has a cloth material 3 laminated on an outer surface of a paper material 2 such as kraft paper. The cloth material 3 is obtained by dividing a resin film divided in a plurality of strips by dividing the resin film in the width direction, or by woven a narrow resin film in a mesh shape. Since the cloth material 3 is laminated on the paper material 2, the strength of the sheet material 1 can be increased.

The cloth material 3 is laminated only on one surface of the paper material 2 so that it appears only on the outer surface of the bag body 10 and does not appear on the inner surface. The resin constituting the cloth material 3 is polyethylene such as low density polyethylene,
Such as polypropylene and other olefin resins,
It is a resin material that can be welded by heat. The sheet material 1 may be a sheet material in which a heat-fusible resin film is laminated on the outer surface of the paper material 2.

As shown in FIG. 4, the sheet material 1 has a center line O extending at the center in the width direction as a boundary, and one part becomes a first surface 11 later and the other part becomes a second surface 12. Part. As shown in FIG. 4, the first surface 11 of the sheet material 1
In the portion where
To apply the adhesive 25 to a predetermined width. This adhesive 2
5 is applied at a constant pitch at predetermined intervals in the longitudinal direction of the sheet material 1. For example, the sheet material 1 is continuously transferred in the longitudinal direction (the direction of the arrow), and a rotating body provided with an application body (brush, sponge, etc.) corresponding to the application pattern of the adhesive 25 at the rotating end portion is used. Then, an adhesive is sequentially applied to the applying body, and the rotating body is rotated in the transport direction of the sheet material 1, whereby the adhesive 25 can be applied as shown in FIG.

Next, a folding guide plate is applied to the center line O of the sheet material 1 fed along the longitudinal direction, for example.
As shown in FIG. 5, an M-shaped fold 1
5 is formed. The shape of the folded portion 15 has a first internally folded surface 16 that is folded from the first surface 11 and a second internally folded surface 17 that is folded from the second surface 12. The first inwardly bent surface 16 and the second inwardly bent surface 17 are separated by V from the center line O.
It is a shape folded into a letter shape.

In a state where the M-shaped folded portion 15 is formed as shown in FIG. 5, the first surface 11 and the second surface 12 are adhered via an adhesive 25, and The folding joint 21 is formed. The individual bags 10 are separated by cutting along the cutting line CL set at the center of the width dimension of the adhesive 25 application region. The adhesive 25
When using a hot melt type as the adhesive, the adhesive 25
The first surface 11 and the second surface 12 are heated and pressurized in the region where the is applied, and the joining is completed.

FIG. 6 is a perspective view showing an adhesive structure in units of individual bags 10, and FIG. 7 is a side view thereof. As shown in FIG. 7, in the folding joint portion 21 where the adhesive of the M-shaped folded portion 15 is applied, when the M-shaped folded portion is defined as the region I and the other portions are defined as the region II, In I, the adhesive 25 is applied to the inner surface of the first surface 11 and the inner surface of the first inner folded surface 16. In region II,
An adhesive is applied to the inner surface of the first surface 11.

Therefore, in the state where the M-shaped folded portion 15 is formed, when the bonding is performed by the adhesive 25, in the region I,
The inner surface of the first surface 11 and the inner surface of the first folded surface 16 are bonded, and in the area II, the inner surface of the first surface 11 and the inner surface of the second surface 12 are bonded. However, the folding part 1
In the region I of No. 5, the inner surface of the second surface 12 and the inner surface of the second folded surface are not bonded. Therefore, at the time of completion of the bonding operation, a drain hole 26 formed by the non-bonding of the inner surface to the inner surface is opened in the folding joint 21 (FIG. 3).
And FIG. 8).

At the time of the above-mentioned bonding, the bag 10 can be used as the bag 10 having the drain hole 26.
At the fold joints 21 and 21, heat sealing is performed by partially applying pressure from above and below with a heating plate. As described above, since the heat-weldable cloth material 3 is laminated on the outer surface of the sheet material 1, the outer surface of the first inner folded surface 16 and the outer surface of the second inner folded surface 17 shown in FIG. And the cloth material 3
Are welded to each other by melting. However, since the cloth material 3 is not provided on the opposing surface between the inner surface of the second surface 12 and the inner surface of the second folded surface 17, the water drain hole 26 is opened at this portion. Remains.

By the above process, as shown in FIG.
4, the M-shaped folded portion 15 is formed, the sheets are joined to each other by the folded joint portions 21 on both sides thereof, and the bag body 10 in which the unbonded drainage holes 26 are formed on the sides thereof can be formed.

The bag body 10 has drain holes 26 on both sides at the bottom portion 14 at the back, so that rainwater and the like inside can be effectively extracted from the drain holes 26.

[0028]

As described above, according to the present invention, a bag having a drain hole at the bottom can be easily manufactured by a simple process.

[Brief description of the drawings]

FIG. 1 is a perspective view of a bag according to the present invention;

FIG. 2 is a perspective view showing a state in which the end of the long material is covered with a bag.

FIG. 3 is a perspective view showing a folding joint at the bottom of the bag;

FIG. 4 is a perspective view showing a step of applying an adhesive to a long sheet material,

FIG. 5 is a perspective view showing a state in which an M-shaped folded portion is formed on a sheet material.

FIG. 6 is a perspective view showing a joining structure of a sheet material.

FIG. 7 is a side view showing a joining structure of the sheet material;

FIG. 8 is a side view showing a state in which a drainage hole is formed in the folding joint of the sheet material;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sheet material 2 Paper material 3 Cloth material 10 Bag body 11 1st surface 12 2nd surface 13 Joining part 14 Bottom part 15 Folding part 16 1st inner folding surface 17 2nd inner folding surface 18 Opening 21 Folding joining Part 25 Adhesive 26 Drain hole

Claims (5)

[Claims] 1. A sheet material is folded to form a first surface and a second surface, and both side edges of the first surface and the second surface are bonded to each other, and the first sheet and the second surface are bonded. In the bag body in which the folding boundary of the sheet No. 2 is the bottom and the side opposite to the bottom is the opening, the boundary between the first surface and the second surface is folded inward from the first surface. M-shaped folded portion having a first inwardly folded surface and a second inwardly folded surface folded inward from the second surface is formed. The first surface and the second surface are adhered to each other except for the surface and the first folded surface, and the folded portion, and the facing surface of the second surface and the second folded surface is A bag body having a drainage hole without being bonded. 2. The bag according to claim 1, wherein the first and second inner fold surfaces are further bonded. 3. A heat-sealing layer is formed only on an outer surface of the sheet material opposite to a surface opposite to a first surface and a second surface, and the first inner folded surface and a second heat-sealed surface are formed. 3. The bag according to claim 2, wherein the inner folded surface is welded by the heat welding layer. 4. A method according to claim 1, wherein (a) a sheet-like packaging material is provided on the first surface and the second surface.
Applying an adhesive at an interval from the edge of the first surface to an intermediate point between the first surface and the second surface when the first surface is divided into: A first inwardly folded surface inwardly folded from the first surface and a second inwardly folded inwardly from the second surface at the intermediate point with the first surface and the second surface facing each other. Forming an M-shaped folded portion having a folded surface; (c) a first surface and the first inner folded surface with the adhesive;
And bonding the first surface and the second surface other than the folded portion to form a drain hole that is not bonded to a surface opposite to the second surface and the second inner folded surface. And (d) a step of bonding the first folded surface and the second folded surface to each other. 5. A sheet material having a heat-sealing layer formed only on an outer surface opposite to a surface facing a first surface and a second surface is used as the sheet material, and the sheet material is used in the step (d). The method for manufacturing a bag according to claim 4, wherein the first folded surface and the second folded surface are welded by the heat welding layer.