JP2000211653A - Multi-layered bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the need of a troublesome pre-processing process such as pushing-in of a layered bag comprising an inner layer bag for storing objects to be stored inserted into an outer layer bag and to avoid a mixture of foreign matters into the bag by at least overlaying sheets on a base of both inner and outer layers for sealing. SOLUTION: The multi-layered bag 1 is simultaneously formed as a cylinder by an inflation ply separation process and is formed as a double bag comprising an outer layer bag 2 and an inner layer bag 3 where opening ends on upper and lower parts are overlaid and sealed. The inner layer bag 3 is filled with objects 7 to be processed, and both inner and outer layer bags 2, 3 are formed with an upper end seal 5 and a base seal 6. A lubricant (talc) may be provided in advance between a gap 4 between the outer layer bag 2 and the inner layer bag 3 in this case. Thus the gap 4 between the outer bag 2 and the inner bag 3 prevents external movement from transmitting directly to the inner layer bag 3, whereby even if the outer layer bag 2 is broken or receives shock to cause a pin hole, the shock may not be directly transmitted to the inner layer bag 3, avoiding the influence exerted on the bag 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-layered bag, and more particularly, to a so-called double bag or an inflation bag technology in which four sheets made of synthetic resin or the like are stacked and the periphery thereof is sealed. A double-layer bag with a sealed upper end and a lower side, which has reduced hygiene pinholes and has a sanitary and improved workability in which no foreign matter is mixed into the bag particularly during the bag making process. About.

[0002]

2. Description of the Related Art Conventionally, when a large amount (2 kg to 20 kg) of a liquid or a viscous substance is packed in a single synthetic resin bag such as polyethylene for sale / distribution, an object to be stored is stored in an outer layer bag. A double bag in which an inner bag is inserted is known. This is evaluated in that it can prevent leakage of stored items caused by broken bags or pinholes that occur during handling and distribution.

[0003]

However, in the conventional multi-layer bag, the outer bag and the inner bag are separately formed in advance, the inner bag is pushed into the outer bag, and then the inner bag is covered. Since it is manufactured by filling the stored items and then sealing the opening of each bag, it requires cumbersome pretreatment steps such as bag pushing before filling, and at that time the bag is manually handed etc. There is a problem in the process that it is difficult to avoid foreign matter from entering the inside.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a double bag, that is, a multi-layer bag which does not have the above-mentioned problems. A multi-layer bag body, wherein at least a sheet at the bottom of the inner and outer layer bags is overlapped and sealed, In this case, if necessary, the left and right side sheet portions of the bag are overlapped and sealed. Such a multi-layer bag can be made by laminating, for example, four synthetic resin sheets and sealing the periphery thereof. Further, as another bag-making technique, a cylindrical body (hereinafter also referred to as an inflation delaminated body) formed in a state where the inner and outer layers of the bag are separated from each other by an inflation method, and the bottom portion thereof is overlapped and sealed. It can also be a multilayer bag. At this time, if the inner surface of the outer layer bag and the outer surface of the inner layer bag are roughened or a multi-layer bag is provided with a lubricant or the like, a blocking (sticking) phenomenon between sheets can be avoided, and breakage in the distribution process can be prevented. The occurrence of bags and pinholes can be reduced.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments shown in the drawings. FIG. 1 is a front view showing a first embodiment of a multilayer bag according to the present invention.
The double-layered bag 1 formed in m is simultaneously formed on the cylindrical body by the inflation delamination method, and is formed as a double-layered bag of the outer-layer bag 2 and the inner-layer bag 3 which are sealed by overlapping the upper and lower open ends. . The inner bag 3 is filled with about 18 kg of mayonnaise as a processing object 7, and the upper opening and the bottom opening of the inner and outer bags 2 and 3 are respectively overlapped and sealed, and the upper sealing portion 5 and the bottom sealing are closed. The stop 6 is provided. At this time, in making the multi-layer bag 1, a lubricant (talc) (not shown) or the like (not shown) may be added to the gap 4 between the outer layer bag 2 and the inner layer bag 3 in advance.

FIG. 2 is a front view showing a second embodiment of the present invention. A multilayer bag 1 is formed by stacking four synthetic resin film sheets such as polyethylene and sealing the periphery thereof to form a double bag. Have been. That is, the outer bag 2 and the inner bag 3 filled with the object 7 are completely overlapped and sealed by the upper end sealing portion 5, the bottom sealing portion 6, and the right and left side sealing portions (8, 9). I have. It is also easy to process the film sheet surface corresponding to the inner surface of the outer layer bag 2 or the outer surface of the inner layer bag into a rough surface such as a matte surface before the multi-layer bag body 1 of the second embodiment is formed. In addition, a bag made of such a film sheet has little blocking (sticking) between the outer bag 2 and the inner bag 3, so that there is little breakage or pinholes in distribution.

FIG. 3 is a front view showing a third embodiment of the present invention. In the multilayer bag 1, a polyethylene sheet cylinder obtained by an inflation bag-making method is sandwiched between two polyethylene film sheets. The upper end and the bottom opening are overlapped with the polyethylene film sheet and sealed to form an upper end sealing portion 5 and a bottom sealing portion 6. Also,
The left and right sides of the film sheet are the right single sealing portion 8 'and the left single sealing portion 9' of the outer layer bag sealed only by the film sheets. The object 7 is housed in the inner bag 3. Further, in the multilayer bag 1 of the present embodiment, it is easy to form a matte-like rough surface of the polyethylene sheet forming the outer bag 2 in advance. Therefore, the multi-layer bag 1 manufactured using this polyethylene sheet can avoid the blocking (sticking) phenomenon between bags and can suppress the occurrence of bag breakage and pinholes. The multilayer bag 1 according to the first to third embodiments of the present invention may have an outlet for the object 7 to be separately drilled in a part of the multilayer bag 1 if necessary.

Next, the operation of the above embodiment will be described with reference to the embodiment of FIG. Multi-layered bag 1 in which objects 7 are stored
Is usually packed in a cardboard box (not shown) and distributed. As described above, the multilayer bag 1 has the bottom opening and the top opening of the outer bag 2 and the inner bag 3 as the bottom sealing portion 6 and the top sealing portion 5, respectively. Both sides (the waist of the bag) are spaced gaps 4. Therefore, when packed in a cardboard box or the like (not shown) for distribution according to a conventional method, the outer layer bag 2 and the inner layer bag 3 have the gap 4 around the body of the bag even if there is rocking due to heavy handling.
The movement of the outside is not directly transmitted to the inner bag 3 and the outer bag 2
Is hardly transmitted directly to the inner layer bag 3 even if it receives an impact causing a bag break or a pinhole.

In the multilayer bag 1 shown in each embodiment of the present invention, at the time of filling the object 7 into the inner layer bag 3, at least the bottom sides of the inner and outer layer bags 2 and 3 are overlapped and sealed. Therefore, it can be achieved by performing a filling operation almost the same as the case of filling the storage object 7 into a single bag. Therefore, a step of inserting the inner bag 3 into the outer bag 2 as in the conventional layered bag body 1 shown in FIG. 4 is not required, and it is possible to prevent dust or the like from being caused by this step. The manufacturing process can be simplified.

[0010]

As described above, according to the present invention, at least the inner and outer layers forming the multi-layer bag body are overlapped and sealed at the bottom side to form a double bag. Leakage of stored items due to breakage of bags, etc., is of course small, and there is no need for a work process of pushing the inner bag into the outer bag before storing the stored items. Etc. can be prevented from being mixed. Therefore, there is an effect that the manufacturing process of the bag body can be simplified and the management thereof is also easy.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is a front view showing another embodiment of the present invention.

FIG. 3 is a front view showing a third embodiment of the present invention.

FIG. 4 is a front view showing a conventional example of a multilayer bag.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Multilayer bag 2 Outer bag 3 Inner bag 4 Gap part 5 Upper sealing part 5 'Upper single sealing part 6 Bottom sealing part 6' Bottom single sealing part 7 Stored object 8 Right sealing part 8 'Right side Single sealing part 9 Left sealing part 9 'Left single sealing part

Claims (5)

[Claims] 1. A multi-layer bag in which an inner bag for storing an object to be stored is inserted in an outer bag, wherein at least sheets at the bottom of the inner and outer bags are overlapped and sealed. Characteristic multi-layer bag. 2. The multi-layer bag according to claim 1, wherein the left and right edge side sheet portions of the bag are overlapped and sealed. 3. The multilayer pouch according to claim 1, wherein the inner and outer pouches are sealed by overlapping the bottom sides of an inflation delamination cylindrical body. 4. The multilayer bag body according to claim 1, wherein at least one of the inner surface of the outer layer bag and the outer surface of the inner layer bag has a matte rough surface. 5. The multi-layer bag according to claim 3, wherein a lubricant is added or applied between the inner surface of the outer layer bag and the outer surface of the inner layer bag.