JPH08301303A - Connected bags and method for manufacture - Google Patents

Abstract

PURPOSE: To provide a method for manufacturing connected bags without using a special film base and in a relatively simple manner as well as connected bags obtainable thereby. CONSTITUTION: Bags 21 each having at least one hole 31 in each of its front and back sides at positions not in alignment between the two are laid alternately upon bags 22 each having the holes 31 at positions which are in linear symmetry breadthwise. The bags are put together in a manner of making each hole 31 meet another hole 31. Subsequently hot rods are thrust through the holes 31.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting bag which can easily open a filling port for contents when it is used for automatic packaging, and a manufacturing method thereof.

[0002]

2. Description of the Related Art When a flexible bag is used for automatic packaging, it is very difficult to open a filling port for the contents in an automatic packaging line. In order to solve such a problem, conventionally, a method of blowing air from the filling port of the bag toward the inside of the bag to open it, and a method of pulling and opening the outer surface of the bag around the filling port with a suction cup or the like have been adopted. It was

However, in the method, opening is difficult when a bag having blocking property is used, and when the method is used, opening is difficult when a bag having a weak waist is used. In addition, in both cases, it was necessary to attach a special device to the automatic packaging line.

[0004]

SUMMARY OF THE INVENTION The problem to be solved by the present invention is to provide a connecting bag body capable of stably opening a filling port of a bag without using a special device, and particularly to a simple manufacturing method. The purpose is to provide a connecting bag. Another object is to provide a method for manufacturing the bag.

[0005]

As a means for solving the above problems, a plurality of bags 2 made of thermoplastic resin are connected to each other only on the outer surfaces of the bags 2 without adhering the inner surfaces of the bags 2 to each other. The connecting bag body 1 is provided in the form of a series, and the connecting bag body 1 is characterized in that the connection is made by fusion bonding of a thermoplastic resin. There are one or more holes 31 and one small hole 32 on one side, and a small hole 32 is formed on the rear surface of the hole 31.
Bag 21 made of thermoplastic resin having a hole 31 on the back surface of 2
With the same size as the bag 21, the hole 31 of the bag 21 and the hole 31 in the widthwise center line of the bag 21 are line-symmetrical to each other, and the small hole 32 of the bag 21 and the widthwise center line of the bag 21 have Small holes 32 at line symmetrical positions
The bag 22 having is a bag body 1 that is alternately stacked,
These holes are the holes 31 of the bag 21, the small holes 32 on the back surface thereof,
Small hole 32 of bag 22, hole 31 on the back, hole 31 of bag 21
.. in the order of stacking in the stacking direction of the bags, and the bags 21 and 22 are block-sealed around the respective small holes 32 to be connected to each other. The body 1 is provided, and furthermore, a bag 21 having at least one hole 31 provided on the front surface and the back surface of the bag made of a thermoplastic resin at positions not overlapping each other, and a hole having the same size as the bag 21. Bags 22 made of a thermoplastic resin, each of which has a line 31 in the widthwise center line of the bag and which is symmetrical to the bag 21, are alternately stacked so that the hole 31 of the bag 21 and the hole 31 of the bag 22 are in contact with each other. Holes 3 in the bag stacked with hot rods
Pierce the part where 1 is located, and the holes 3 in the bags 21 and 22
There is provided a method for manufacturing the connecting bag body 1, characterized in that the surfaces not provided with 1 are block-sealed. Furthermore, fine holes 33 are provided on the back surface of the holes 31 of the bags 21 and 22. A method for manufacturing the connecting bag body 1 is provided, which is characterized by being provided.

[0006] That is, when the automatic bagging or the like is performed, when the connecting bag body 1 in which a plurality of bags connect the outer surfaces of the bags in series is used, the filling port of the bag is not opened by using a complicated method. However, the present invention has been found that the filling port of the next bag can be opened by pulling to remove the bag that has been filled with the contents.

The connecting bag according to the present invention is preferably used as a packaging material for mechanically automatic packaging, but is not limited to this, and a bag for containing cleaned clothes, a garbage bag, etc. The present invention can be used in any case when packaging an article that has been conventionally packaged in a flexible bag, and is particularly suitable for packaging in which opening of the filling port is difficult.

The present invention will be described in more detail with reference to the drawings. FIG. 1 is a perspective view showing an embodiment of a connecting bag body 1 according to the present invention. Other than the bag 2 located at the end, the two bags 2 located at the front and rear are connected, and the bag 2 located at the end is connected to only one adjacent bag. The connecting method is not particularly limited, and examples thereof include a heat sealing method, a method using an adhesive, and a method using a stapler.

However, as a method of connecting a large number of bags at a time without adhering the inner surfaces of the bags to each other, the present inventors have prepared the bags 21 and 22 as shown in FIG. Then, a method for manufacturing the connecting bag body 1 in which the holes 31 are alternately stacked and pierced by a hot rod at the portion where the holes 31 are formed is simultaneously invented.

FIG. 2 is a plan view and a sectional view showing an embodiment of the bag 21 and the bag 22 used in the manufacturing method of the present invention. The bag 21 has at least one hole 31 on each of the front surface and the back surface thereof. The position of the hole 31 is not particularly specified as long as the front surface hole 31 and the rear surface hole 31 do not overlap each other, but in order to prevent the contents from leaking from the holes 31, the holes 31 are provided around the filling port 4 of the contents. Preferably there is. Further, if the holes 31 on the front surface and the holes 31 on the back surface are in line symmetry with respect to the center line of the film (α = β in FIG. 2), the connecting bag body 1 is formed and then the connecting bag is passed through here. When the body 1 is suspended, the connecting bag body 1 is stable, which is preferable. However, a hole for passing a rod-shaped object other than the hole 31 may be separately provided. Further, the number of holes 31 is not particularly limited as long as it is two or more. As the number of holes 31 increases, the number of sealing points between the bags increases, so that the adhesive strength increases, but it takes time and effort to manufacture the bags and separate the used bags.

Like the bag 21, the bag 22 also has holes 31 on the front surface and the back surface, respectively. The number of holes 31 of the bag 22 is the same as that of the bag 21, and the position of the holes 31 is the same as that of the holes 3 of the bag 21.
This position is line symmetrical with respect to the position 1 and the center line γ in the width direction of the bag.

The thermoplastic resin forming the bags 21 and 22 is not particularly limited, and high density polyethylene, medium density polyethylene, low density polyethylene, linear low density polyethylene, polypropylene, polyethylene terephthalate, polybutylene terephthalate, Polybutene-1, ethylene-vinyl acetate copolymer, soft polyvinyl chloride, ethylene-methyl acrylate copolymer, ethylene-methyl methacrylate copolymer, thermoplastic polyurethane,
Examples thereof include a blend of one kind or a plurality of kinds of synthetic resins selected from ionomers. In particular, low-density polyethylene, linear low-density polyethylene, and blends of these resins are preferable because they are low cost and have good sealing properties.

As a method of forming the bags 21 and 22 from these resins, the above resins are used for the inflation method and the T method.
An example is a method of forming a film using a known means such as a die method, forming holes 31 by punching, and then making a bag.

A method of manufacturing the connecting bag 1 according to the present invention will be described using the bags 21 and 22 thus obtained. FIG. 3 is an explanatory view showing the manufacturing method. First, the bags 21 and 22 are alternately stacked. At this time, the bag 21
The hole 31 of the bag and the hole 31 of the bag 22 overlap each other, and the bags 21 and 22 are
Stack so that the openings are in the same direction. FIG. 3C is a perspective view of the laminated bag body, and FIG. 3D is a cross-sectional view of the surface aa ′ where the holes 31 overlap.

Next, the portion where the holes 31 are overlapped is pierced by a hot rod. At this time, a hot rod having a radius smaller than that of the hole 31 pierces the inside of the hole 31 so that the hot rod does not melt around the hole 31. As shown in FIG. 3D, the bag 21 is formed on the surface where the holes 31 overlap each other.
A portion b where the holes 31 are in contact with each other and a portion c is a surface where the holes 31 are not in contact with each other in the joint surface between the bag and the bag 22.
Alternating with each other, only the surface not having the hole 31 is melted by the hot rod, and the periphery thereof is block-sealed while the small hole 32 is provided (FIG. 3 (D)).

At this time, in order to pierce the desired position with the hot rod correctly and to adjust the amount of resin melted by the hot rod, the bag 21 and the bag 22 have the fine holes 33 in the back of the holes 31 in advance. It may be provided (Fig. 4). The small holes 33 are preferably smaller than the small holes 32 formed by the hot rod. In addition, when the bag 2 is removed from the connecting bag 1 after filling the contents, there is a hole 31 or a small hole 32 in the removed bag 2 so that the aesthetic appearance of the bag 2 is not deteriorated. A perforation is provided on the bottom side of the holes 31 and the small holes 32 of the connecting bag body 1 after filling the contents.
The bag 2 may be separated.

The bag body thus obtained is formed by connecting bags having at least one hole 31 and at least one small hole 32 on each surface, which are block-sealed around the adjacent small holes 32.

[0018]

[Effect] When the connecting bag body 1 according to the present invention is used, since the inner surface of the bag is not attached and only the outer surface is connected to form a series, the bag located at the outermost end is filled with contents and then the bag is filled. At the same time, a new bag is taken out with the contents filling port opened.

Therefore, when the connecting bag body of the present invention is used for automatic packaging, a special device for opening the bag is unnecessary, and the bag can be opened stably regardless of the material of the bag. . Further, when the connecting bag body 1 of the present invention is attached to a trash box or the like and is used from the bag located at the end, it is possible to save the labor of attaching the trash bag to the trash box.

In addition to the above, the connecting bag 1 of the present invention is used for packaging a flexible bag with contents, such as a package for cleaned clothes, when opening a bag or opening a new bag. The work of taking out is omitted, and the work efficiency is improved.

Further, when the method for manufacturing the connecting bag 1 according to the present invention is used, it is possible to block-seal only a large number of blocks at a time without adhering the inner surface of the bags. Further, as long as the bag is made of a thermoplastic resin, the connecting bag body 1 can be manufactured from an inexpensive general-purpose bag without using a special base material.

[Brief description of drawings]

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

FIG. 2 is a plan view showing an example of a bag used for the connecting bag body of the present invention and a cross-sectional view taken along line aa ′.

FIG. 3 is an explanatory view showing a manufacturing method of the present invention.

FIG. 4 is a plan view showing an example of a bag used for the connecting bag body of the present invention, and a cross-sectional view taken along line aa ′.

[Explanation of symbols]

1 connecting bag 21, 22 bag 31 hole 32 small hole 33 micro hole α, β distance from the middle line to the hole γ middle line in the width direction of the bag b part where holes overlap c surfaces that do not have holes overlap Part

Claims (5)

[Claims] 1. A connecting bag body 1 comprising a plurality of bags made of a thermoplastic resin, wherein the inner surfaces of the bags are not attached to each other and only the outer surfaces of the bags are connected to each other. 2. The connection bag body 1 according to claim 1, wherein the connection is made by fusion bonding of a thermoplastic resin. 3. A bag has at least one hole 31 and at least one small hole 32 on one side thereof, and further has a small hole 32 at the back surface of the hole 31.
A bag 21 made of a thermoplastic resin having a hole 31 on the back surface of the small hole 32, and having the same size as the bag 21 and having the hole 31 at a position line symmetrical with the hole 31 of the bag 21 in the width direction middle line. Further, the small hole 32 of the bag 21 and the bag 22 having the small hole 32 at a position line-symmetric with respect to the center line in the width direction of the bag 21 are bag bodies 1 that are alternately stacked. These holes are the holes of the bag 21. 31, a small hole 32 on the back,
Small hole 32 of bag 22, hole 31 on the back, hole 31 of bag 21
In the order of ..., The bags 21 and 23 overlap in a straight line in the stacking direction, and the bags 21 and 22 are connected by block-locking around the small holes 32. 3. The connection bag body 1 according to any one of 1 to 2. 4. A bag 21 in which at least one hole 31 is provided on the front surface and the back surface of a bag made of a thermoplastic resin so as not to overlap each other, and the size of the bag 21 is the same as that of the bag 21. Bags 22 made of thermoplastic resin, which are line-symmetrical to the bag 21 at the middle line in the width direction of the bag, are alternately stacked so that the holes 31 of the bag 21 and the holes 31 of the bag 22 are in contact with each other, and further stacked with a heating rod. 4. The connection bag body 1 according to claim 1, wherein the portion of the bag body where the hole 31 is located is pierced to block-seal the surfaces of the bag 21 and the bag 22 where the hole 31 is not provided. Production method. 5. The method of manufacturing the connecting bag body 1 according to claim 4, wherein fine holes 33 are provided on the back surfaces of the holes 31 of the bags 21 and 22.