JPH07100365B2 - Bag for compression packaging - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminate using a polyolefin synthetic resin as a raw material, and more particularly to a laminated sheet formed by an extrusion laminating method. More specifically, it is composed of two different materials, a woven fabric substrate and a laminated film. The present invention relates to a compressed packing bag.

[0002]

2. Description of the Related Art Conventionally, as a bag for compression packing of this type, a flat yarn made of polypropylene as a raw material is used as a warp, and a non-stretched film is formed on the inside of a base fabric made of a woven fabric used as a weft. A bag-like bag is used in which a film is adhered by a hot melt method or a film is entirely laminated on a woven base material by an extrusion laminating method.

Such a bag bears the repulsive stress of cotton compressed and packed in the outer woven fabric, and since the film is provided on the inner side, the film exhibits a waterproof effect and the inner layer The cotton is protected and the flexibility of the film makes it very good in terms of work.

The packing bag is composed of a bag body 4d and a lid body 4e as shown in FIG. 5, for example.
When this is used, first, as shown in FIG. 5, the bag 4d is placed on the lower part 6 of the packing machine 5 with the film side on the front side, and the cotton 7 is placed on the bag 4d. The lid 4e is placed on top of the cotton 7 and is sandwiched between the upper portion 8 and the lower portion 6 of the packing machine 5.

Next, the bag body 4d is folded back along the cotton 7 to the front side, and the upper portion of the cotton 7 is covered with the lid body 4e. Thereafter, as shown in FIG. 6, the periphery of the bag 4c composed of the bag body 4d and the lid body 4e. A plurality of strips of iron 9 are wound around and the packing machine 5 compresses the bag 4c together with the cotton 7 from above and below to compress and pack the cotton 7, and then the lower portion 6 of the packing machine 5 is lowered by the action of the cylinder, and the packing is performed. When the body 4e is taken out, a swollen package 4c between the wound band irons 9 as shown in FIG. 3 is obtained.

[0006]

However, in such a package 4c, the elongation of the part closed by the band iron differs from that of the part other than the band iron depending on the presence or absence of the band iron. When the portion between the band irons 9 of the package 4c swells after packing the cotton 7, a gap between the film 2c and the woven fabric 1 occurs between the swelled portion and the other portion, but on the other hand Film 2 for hot melt adhesion
And the woven cloth 1 are firmly attached to each other with a strong adhesive force, and in the case of laminated lamination, the laminated film 2 and the woven cloth 1 are completely integrated, and the film 2 and the woven cloth 1 are completely laminated, and There is a fatal defect that the film 2 may be damaged due to the peeling force between the layers as described above in a state where the film 2 is not peeled off.

As a result, the waterproof effect of the film 2 is impaired, and there is a serious problem that the internal cotton cannot be sufficiently protected.

[0008]

SUMMARY OF THE INVENTION In order to solve all of the above problems, the present invention prevents the base material such as a woven cloth from peeling off from the film during the packing operation of cotton and the cloth is not compressed during the compression process. This is based on the idea that the base material and the film are bonded with a weak adhesive force that allows the cloth and the film to be separated from each other.

That is, a means for solving the above problems of the present invention is to provide a polypropylene flat yarn and a warp yarn composed of 5 to 50% by weight of the polypropylene flat yarn of a high density polyethylene flat yarn.
The base fabric interwoven with the weft yarns made of a polypropylene flat yarn is to become constituting the low density polyethylene by the product layer.

All the warp yarns are made of polypropylene flat yarn, and the weft yarns are made of polypropylene flat yarn and 5 to 50 relative to the polypropylene flat yarn.
It is also possible to compose a high-density polyethylene flat yarn by weight%, and both warp and weft are composed of a polypropylene flat yarn and a high-density polyethylene flat yarn of 5 to 50% by weight with respect to the polypropylene flat yarn. Is also possible.

[0011]

In other words, because of such a structure, when the cotton is compressed and packed, a part of the package bulges out, and the film of the bulged part is integrated with the cotton inside and the outer woven fabric Even if there is a gap between them and a peeling force is generated between the woven fabric and the woven fabric 1, the polypropylene flat yarn warp yarn 1a and the polypropylene flat yarn weft yarn 1b, which are the majority of the structure of the woven fabric, are different from the low-density polyethylene of the laminated film. Not adhered, only slightly adhered to the high-density polyethylene flat yarn 1c part of the warp, and if misalignment between layers is generated, the laminated film is easily peeled off from the woven fabric, and thus the film is damaged. Never.

[0012]

[Example] As a woven fabric, the weaving density of both warp and weft is 13 threads / inch, and the warp is polypropylene (MFR = 4.0,
Flat yarn 1.000 denier 1 with a melting point of 141 ° C)
0 and high density polyethylene (MI = 0.8: melting point 13
Three flat yarns of 1.000 denier (0 ° C) are continuously and alternately used, and polypropylene (MF
R = 4.0: melting point 141 ° C.) flat yarn 1.00
Using a woven fabric composed of 0 denier, a low density polyethylene (MI = 4.0, melting point 11
2 ° C.) diameter 90mm, L / D = 28 single screw in an extruder than the resin temperature 270 ° C. with a screw structure of the Ramine preparative method exits press low density polyethylene was melt from a T-die having an average thickness of 30μm on the fabric sheet Lamination is performed to form a bag for cotton compression packaging.

The laminated woven fabric and the film were adhered to each other at a part of the woven fabric, that is, at the high-density polyethylene part, but the adhesive force could be lightly separated by hand. After separation of the woven fabric substrate and the laminated film, all or part of the laminated film did not remain adhered to the woven fabric side, and the laminated film was not broken.

A packing operation was performed using this laminate,
The film did not separate from the woven fabric during the work of winding the cotton with the laminate. After compression packing, the product was placed on the normal transportation route and the damage and peeling of the laminated film were examined at the final unpacking place, but the woven fabric and the film were not tightened by the band iron, that is, the bulging part between the band irons. Was peeled off and the film was not damaged at all.

Further, since the hot melt adhesive or the like is not used, the adhesive does not remain, and therefore the package 4
It is possible to reuse the other film 2 and the woven cloth 1 even after the cotton 7 is taken out from the cotton, and the woven cloth and the laminated film are separately recovered and pelletized to obtain the original polypropylene or low density polypropylene. Also when returning, there is an advantage that relatively high efficiency regeneration is possible since no adhesive is used.

In the above embodiment, as the warp,
Polypropylene flat yarn 1.000 denier 1
Flat yarn of 0 and high density polyethylene 1.000
Three consecutive denier were alternately used in succession, so that 30% by weight of high density polyethylene flat yarn was used for polypropylene flat yarn.
The weight ratio of the high-density polyethylene flat yarn to the polypropylene flat yarn is not limited to this, and the point is to use 5 to 50% by weight of high-density polyethylene based on the polypropylene flat yarn.

In the embodiment, the polypropylene flat yarn and the high density polyethylene flat yarn are used for the warp and the polypropylene flat yarn is used for the weft. On the contrary, the polypropylene flat yarn is used for the warp and the polypropylene is used for the weft. Flat yarns and high-density polyethylene flat yarns may be used, and further, polypropylene flat yarns and high-density polyethylene flat yarns may be used for both yarns.

However, in either case, 5 to 50% by weight of high density polyethylene is used with respect to the polypropylene flat yarn.

[0019]

As described above, according to the present invention, in the warp yarn and / or the weft yarn, since the woven fabric is formed by using 5 to 50% by weight of high-density polyethylene with respect to the polypropylene flat yarn, the cotton packing operation is performed. sometimes becomes the both are bonded woven and film with poor adhesion enough to the woven fabric and the film may be peeled off after the start bale of and cotton without peeling, the result, the compression after bale of cotton Even if a part of the package swells due to the repulsive force of the cotton, and the film in the bulged part is stretched from the woven fabric to cause peeling force between the film and the woven fabric, As described above, peeling is very easy due to the weak adhesive force, and therefore the peeling force between the film and the woven cloth is not applied to the film side as in the conventional case, so that the damage of the film can be almost completely prevented. They came to have a significant effect.

As a result of preventing the film from being damaged in this manner, there is a great practical benefit that the waterproof property and the workability which are the original characteristics of the bag having the film are never impaired.

[Brief description of drawings]

FIG. 1 is a plan view of a main part of a bag body that constitutes a bag for compressing cotton according to an embodiment.

FIG. 2 is an enlarged cross-sectional view of the AA line in FIG.

FIG. 3 is a front view of the package after packaging.

FIG. 4 is an enlarged sectional view of part B in FIG.

FIG. 5 is a schematic front view showing a state where the bag is installed in the packing machine.

FIG. 6 is a front view showing a package during compression packaging.

FIG. 7 is an explanatory diagram showing a relationship between warp and weft yarns in a part of a woven fabric.

[Explanation of symbols]

 1 ... Woven fabric 2 ... Laminated film 3 ... Adhesive part 4 ... Bag 7 ... Cotton

Claims (3)

[Claims] 1. A warp composed of a polypropylene flat yarn and a high-density polyethylene flat yarn of 5 to 50% by weight based on the polypropylene flat yarn,
The base fabric interwoven with the weft yarns made of a polypropylene flat yarn, bags for bale, characterized in that formed by constituting the low density polyethylene by the product layer. 2. A base fabric woven by a warp yarn composed of polypropylene flat yarn and a weft yarn composed of polypropylene flat yarn and high density polyethylene flat yarn of 5 to 50% by weight based on the polypropylene flat yarn. a bag for bale, characterized in that formed by constituting the low density polyethylene by the product layer. 3. A polypropylene flat yarn and a warp composed of 5 to 50% by weight of the polypropylene flat yarn of a high density polyethylene flat yarn,
Polypropylene flat yarn and the base fabric woven in a weft comprised of 5 to 50 wt% of high density polyethylene flat yarn to said polypropylene flat yarn, it is formed by constituting the low density polyethylene and product layer A bag for compression packaging characterized by.