JP2001225887A - Packaging bag for shape-deteriorating content - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packaging bag which can prevent a content easy to break by impact from being damaged, and can greatly reduce wastes generated after use of the content while maintaining the configuration being displayable, and can reduce both of the costs of raw materials and the personnel expenses. SOLUTION: This packaging bag comprises a double bag of an internal bag and an external bag, in which a content which is easily deteriorated by an external force is housed. A gas layer, preferably an air layer, is provided between the internal bag comprising a double face thermally weldable film, and the external bag comprising an internal surface thermally weldable film. At the same time, at least at one location, the internal bag and the external bag are welded, preferably at vertical and/or lateral welded sections. At the time of the manufacture, the internal film and the external film, which are separately wound, are rewound while being superposed. Then, the content is mounted, and respective both end edge sections of the internal film and the external film are integrally welded. Compressed air is fed by inserting a nozzle in a space between the internal film and the external film, and then, a lateral welding-cutting is performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an article having a shape which is unstable and easily collapsed. The present invention relates to a packaging bag of a shape-deteriorating content that can be easily packaged and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, agricultural products such as mushrooms, especially maitake mushrooms, peaches, figs, and strawberries are unstable in shape, are easily damaged or chipped, and are damaged when stored in ordinary plastic bags. However, tray wrap packaging was carried out on a rigid plastic tray and covered with a wrap film.

[0003]

The tray packaging is a waste material after use, and the tray uses a large amount of plastic and is bulky, so there is a problem in its treatment. It is recommended that tray packaging be avoided as much as possible. . Filling in a plastic bag is a preferred method because the amount of plastic material used is small, but if the contents are shape-deteriorating, the contents will be impacted through the flexible bag material during the distribution process. It is damaged and its appearance is significantly impaired, which impairs its value as a product. Therefore, there has been a demand for a technique of using a plastic bag and making it less susceptible to an external force.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problem, and the structure of the present invention is a packaging bag comprising a double bag of an inner bag and an outer bag for storing contents which are easily deteriorated by an external force. A gas layer, preferably an air layer, is provided between an inner bag made of a double-sided heat-sealable film and an outer bag made of an inner-side heat-sealable film.
At the point, preferably, the inner bag and the outer bag are fused at the vertical and / or horizontal fusion part, and in the production thereof, (1) the inner film and the outer film wound separately are Unwinding with the inner film facing upward, (2) two films are fused together using two or more fixed sealers to provide a plurality of local linear integrated portions, and (3) a central portion in the width direction of the film. (4) Both ends of the inner film and the outer film are fused together to form a cylindrical shape, (5)
(6) Then, a nozzle is inserted from between the inner film and the outer film to supply compressed air, and then (6) horizontal fusion and cutting are performed.

That is, according to the present invention, the contents having shape deterioration are accommodated in a flexible plastic inner bag, and the inner bag is accommodated in an outer bag, and air is filled between the inner bag and the outer bag. Things. It is preferable that the inner bag and the outer bag are locally fused in order to prevent the inner bag from moving in the outer bag, and the horizontal fusion portion of the inner bag and the horizontal fusion portion of the outer bag are integrally formed. If the inner bag is fused, the movement of the inner bag in the outer bag is reliably prevented, and the inner film and the outer film are intermittently fused into two or more lines having a non-fused part. Thereby, the buffering effect of the air filled between the inner bag and the outer bag is further enhanced.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The contents of the present invention that are easily degraded by external force include mushrooms, especially mushrooms, peaches, figs,
Agricultural products such as strawberries and precision parts such as semiconductor bases, as well as porcelain and glass products that are apt to be damaged, are hereinafter referred to as shape-deteriorating contents. The gas filled between the inner bag and the outer bag is generally air, but nitrogen gas or carbon dioxide gas may be used depending on the contents.

The plastic film used in the present invention is not particularly limited and may be transparent or opaque. Polyethylene, polypropylene, polyester, nylon, vinyl chloride, a laminate thereof, or a metal-deposited layer thereof, polyvinylidene chloride, aluminum foil, Laminates with paper and other materials are also used. As the material for the inner film, the inner surface is heat-fusible. The heat-fusible layer on the inner surface is necessary for bag making, and in order to fuse the inner bag with the outer bag, the outer surface is also preferably heat-fusible. The outer film only needs to have a heat-fusible inner surface. The same film may be used for the inner film and the outer film. However, if the inner film is flexible, the contents are well protected, and if the outer film is slightly hard, it is preferable because the external impact can be reduced. Thin polyethylene, unstretched polypropylene and the like are preferably used for the inner film, and thicker stretched polypropylene, polyester, nylon and the like are used for the outer film.

[0008] The form of the bag is not particularly limited. A two-sided seal type in which both ends of a tubular film are horizontally fused, a three-sided seal type in which the film is folded in the length direction and has one vertical fusion part, and a vertical fusion part is the center of one side of the bag. A pillow type, a four-sided fusion type, a stand pack, and the like, which are horizontally fused to each other. In the present invention, the vertical fusion part means a fusion part parallel to the flow direction of the supplied film, and the horizontal fusion part means a fusion part perpendicular to the flow direction of the film. When the horizontal fused portions at both ends of the inner bag are fused together with the horizontal fused portions at both ends of the outer bag, the movement of the middle bag in the outer bag is restricted, and vibration and external pressure applied to the contents are reduced. . For example, after once sealing the contents in the inner bag, this inner bag is placed in the center of the outer film of the horizontal bag making and filling machine, and the inner bag is sealed during the horizontal fusion and cutting of the outer film while supplying air. The horizontal fusion bonding portion can also be fusion bonded at the same time. At this time, the horizontal fusion bonding portion fuses the four films of the inner film and the outer film at the same time.

[0009]

EXAMPLES (1) Production of Packaging Bag Another production method of the packaging bag of the present invention will be described with reference to FIG. In this embodiment, a 25 μm-thick non-stretched polypropylene film which is itself heat-fusible was used as the inner film 1. Generally, a thickness of 20 to 30 μm is preferable. As the outer film 2, a laminated film having a thickness of 45 μm in which unstretched polypropylene was laminated as a heat-fusible layer on one surface of oriented polypropylene was used. Generally, a thickness of 35 to 50 μm is preferred. As contents 3, 100 g of mushrooms harvested on the day
It was split and stored. The packaging type was a modified version of a horizontal reverse pillow type automatic bag making and filling machine.

Films are separately supplied from an inner film winding roll (not shown) and an outer film winding roll (not shown), and the inner film 1 is placed on the heat-fusible layer of the outer film 2 on a belt conveyor. Was put. In this example, the inner film 1 was 1 cm wider than the outer film 2. As a first step, two locations separated from each other are heated and fused with a fixed sealer, and the inner film 1 and the outer film 2 are locally fused to form two integrated portions 4. The displacement of the two films was prevented. It is preferable that the non-fused portion 9 is provided intermittently in the integrated portion 4. When the non-fused portion 9 is provided, a buffer portion is formed over the entire surface of the packaging bag as shown in FIG. Integrated part 4
Are provided in the vicinity of the side of the bag made, or on the surface where the vertical fusion bonding portion 5 does not exist, and two or more are provided. Alternatively, it is provided at a position at least 1/6 of the outer diameter of the bag from 5.

In the second step, the contents 3 were supplied and placed at the center of the width of the bag. A part of the contents 3 was placed on the integrated portion 4. As a third step, both ends of the inner film 1 and the outer film 2 are placed on the contents 3 and the four films are combined and fused together with a vertical sealer to form a vertical fused portion 5, thereby forming a cylindrical film. To As a fourth step, the inner film 1 and the outer film 2
Air was supplied to the inside of the vertically fused bag through the nozzle from between. Next, the whole is moved to the right side as shown by the arrow in FIG. 4, and the horizontal fusion and cutting are performed at the position of the fifth step. Reference numeral 6 denotes a horizontal fusion bonding portion. By repeating this process, the inner bag is fused to the outer bag at the horizontal fusing portions at both ends and the two or more integrated portions, and the other portions are filled with air to reduce the impact on the contents in the inner bag. Relaxed pneumatic double packaging bags were produced at a rate of 100 bags / min.

In FIG. 4, before the inner film 1 and the outer film 2 are overlaid, the heat-fusible layer of the outer film may be printed with necessary descriptions and patterns concerning the contents. These printings may be performed before laminating the heat-fusible layer on the outer film, or may be performed on the inner surface of the inner film 1, but the area inside the integrated portion 4 is preferable. Furthermore, since the inside of the integrated portion is the surface of the pillow bag, that is, the portion where the vertical fusion bonding portion 5 does not exist, it becomes a surface on the product display, giving a good impression to consumers. In some cases, two films inside the integrated portion 4 can be laminated.

The shape of the obtained packaging bag is shown in FIGS. FIG. 1 is an explanatory view seen from the back surface with the vertical fusion bonding portion 5, and FIG. 2 is a schematic cross-sectional view taken along the center line of FIG. 1, in a case where the non-fusion portion 9 is not provided at the integrated portion. FIG. 3 is a schematic cross-sectional view taken along the center line of FIG. 1 in a case where four integrated portions 4 are provided and a non-fused portion 9 is provided in these portions. Since only a thin air layer is present on the surface of the packaging bag, if a transparent film is used, the contents 3 which are Maitake mushrooms in FIG. 2 can be clearly recognized and distinguished from the outside. The inner film 1 is in a state of being pressed by an air cushion 7 supplied between the inner film and the outer film. Since the air 8 in the inner bag is also sealed separately from the air cushion 7, each of them exhibits a buffering effect and protects the contents 3 from external force.
Further, in the case of FIG. 3, the packaging bag is protected by the air cushion 7 not only on the front surface but also on the back surface.

(2) 20 bags of 100 g of Maitake mushrooms obtained in the drop test (1) of the package in the shape shown in FIG. 2 are packed in a cardboard box for transporting Maitake mushrooms, sealed, and transported. In anticipation of a fall from a truck, the mushrooms were dropped from a height of 2 m onto a floor laid with a 2 cm thick floorboard, and inspected for damage of the mushrooms. As a comparison, the same pillow bag as in the example was filled with the same mushroom as in the example except that the inner bag was not used, and thus there was no air cushion, and 20 single bags were similarly packed in a cardboard box, The same test as in the example was performed, and the result was set as comparative example 1. As Comparative Example 2, 100 g of Maitake mushrooms were placed on a conventional polyester tray, covered with a wrap film made of vinyl chloride, and 20 tray wrap packages were manufactured in which the end of the wrap film was in close contact with the bottom of the tray. The test was performed in the same manner as in the example, and the result was set as comparative example 2.

The test results were obtained by weighing the broken debris generated in each of the packaging bags and trays after dropping, and summing up the results. The results are shown in Table 1 as the amount of broken debris generated. Further, the appearance of Maitake mushrooms in each packaging bag and tray was observed and totalized and shown in Table 2 as damage appearance evaluation. The criteria are as follows. 0: No damage to the mushroom umbrella. + …… A mushroom umbrella with cracks observed. 2+ ... Mushroom umbrella with three or more cracks. 3+ …… mushroom umbrella is broken and broken. 4+ …… A mushroom umbrella with cracks and several breaks. 5+... Mushroom umbrella cracked or broken and could not be sold as a product. As is clear from Tables 1 and 2, the packaging bag of the present invention exhibited a remarkable impact resistance comparable to that of tray wrap packaging.

[0016]

[Table 1]

[0017]

[Table 2]

[0018]

According to the present invention in which a gas layer is provided between the inner bag and the outer bag and the inner bag and the outer bag are locally fused to prevent the inner bag from moving, the contents are prevented from being damaged. In addition, the waste generated after using the contents was extremely reduced while maintaining the displayable form. Further, the present invention is an ideal packaging bag which can reduce both raw material costs and labor costs since efficient machine packaging is possible.

[Brief description of the drawings]

FIG. 1 is an explanatory perspective view of a packaging bag of the present invention having a partly cutout.

FIG. 2 is a schematic cross-sectional view of FIG.

FIG. 3 is a view showing a case where a cutout portion is provided in an integrated portion.
FIG.

FIG. 4 is a flow sheet showing one embodiment for producing a packaging bag having the shape shown in FIGS. 1 to 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inner film 2 Outer film 3 Contents 4 Integrated part 5 Vertical fusion part 6 Horizontal fusion part 7 Air cushion 8 Air in inner bag 9 Missing part

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3E035 AA11 AA12 BA08 BB01 BB10 BC02 BD10 CA07 DA10 3E064 AA08 AA09 AB13 AB14 AD16 BA22 BA26 BA30 BB03 BC18 EA09 EA18 FA01 GA06 HF09 HG02 HG03 HN05 HU03

Claims (7)

[Claims] 1. A packaging bag for storing contents which are easily deteriorated by an external force and comprising a double bag of an inner bag and an outer bag, wherein a gas layer is provided between the inner bag and the outer bag. A packaging bag of a shape-deteriorating content, wherein the inner bag and the outer bag are fused at at least one place. 2. The packaging bag according to claim 1, wherein the gas layer is air. 3. The inner film for the inner bag is heat-fused on both sides, the flexibility is equal to or greater than that of the outer film for the outer bag, and the inner surface of the outer film is heat-fusible. A packaging bag for the shape-deteriorating contents according to claim 1 or 2. 4. Both the inner bag and the outer bag have both sides of the bag fused together, and the laterally fused portion of the inner bag and the laterally fused portion of the outer bag are integrally fused. A packaging bag of the shape-deteriorating contents according to any one of claims 1 to 3. 5. A pillow type in which an outer film and an inner film in which a packaging bag is overlapped form a tubular body with one vertical fused portion provided on one surface, and both ends are horizontally fused. At least two rows of longitudinally integrated portions connecting the inner film and the outer film are provided at a position at least 1/6 of the outer diameter of the bag from the vertical fusion bonding portion, or 5. The packaging bag according to any one of claims 1 to 4, wherein the inner film and the outer film are laminated and integrated at the site. 6. The packaging bag according to claim 5, wherein the integrated portion has a non-fused portion intermittently. 7. An inner film and an outer film each wound separately are unwound with the inner film facing upward, and (2)
Two or more films are fused by using two or more fixed sealers to provide a plurality of local linear integrated portions, (3) the content is placed at the center in the width direction of the film, and (4) the inner film and Both ends of the outer film are fused together to form a cylindrical shape. (5) A nozzle is inserted between the inner film and the outer film to supply compressed air. (6) Horizontal fusion A method of producing a packaging bag of a shape-deteriorating content, characterized by cutting.