JPS6335968Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a multilayer bag made of paper and plastic film used for photosensitive paper bags for copying, or packaging bags such as fertilizer bags and cement bags.

[Conventional technology]

Conventional photosensitive paper packaging bags for copying have light-blocking properties,
A paper 2 laminated with polyethylene 1 for moisture resistance and a plastic film 3 made of polyethylene or polypropylene containing carbon black are used separately as shown in the first figure, or integrated as shown in the second figure. I was using something. Note 2
a is the outer printing surface of the paper 2.

[Problem that the invention attempts to solve]

Although the two multi-layer bags shown in Figure 1 are strong, they have the disadvantage that they are difficult to automatically package and form using a packaging machine, which particularly impedes speed-up.

Although the single multilayer bag shown in the second figure can be easily packaged and made automatically using a bag making machine, it has the disadvantage that its strength, especially its tear strength, is reduced and it becomes unusable. In particular, there was a drawback that the parts requiring strength on both sides of the multilayer part were easily damaged. Also, if that part is reinforced separately, the cost of materials will increase.

The present invention was developed in view of the above circumstances, and it is possible to partially laminate plastic film or cloth on paper, making it easy to automatically package with a bag making machine, and in particular, paper and plastic film are used in areas that require strength. Alternatively, the cloth can be separated to increase its strength, thereby reducing the paper thickness and film thickness as a whole, and at the same time increasing the speed of the packaging machine to provide a resource-saving multilayer bag.

[Structure of the idea]

In the present invention, a pair of tapes 4, 4 are applied to the paper 2, and a plastic film 3 is laminated thereon. This is a multi-layer bag made of paper and plastic film that is wrapped and made into a bag so that both sides are wrapped.

〔Example〕

Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. 3 to 5, using the same reference numerals for the same parts as in FIGS. 1 and 2.

As shown in the third figure, the paper 2 is fed onto the rolls 5 and 6 together with a pair of tapes 4 and 4, and the T-die 7 above the rolls 5 and 6 is fed.
A molten plastic 3a such as polyethylene or polypropylene containing carbon black is extruded.
The tapes 4, 4 may be ordinary plastic films, but may also be foils or paper, and it is preferable to use various plastic cloths such as high-density polyethylene, oriented polypropylene, ethylene-vinyl acetate copolymer, etc. for the purpose of reinforcing the bag. As a result, as shown in FIG.
The lower parts 8, 8 are not bonded.

This is then sent to a bag making machine, and the contents 9 are packaged so that the non-adhered parts 8, 8 are on both sides of the bag as shown in Figure 5.

[Effect of idea]

As described above, in the multi-layer bag according to the present invention, the paper 2 and the plastic film 3 separate from each other and slide on both sides where the force acts, so they act like two sheets and absorb stress from the outside. Since the bag is dispersed and received, it is strong, and since it is integrated as a whole, it is easy to make bags using a bag making machine, and the speed of bag making can be increased.

In the above embodiment, the paper 2 and the plastic film 3 are laminated so as to be partially adhered to each other, but if a plastic cloth, especially one woven from stretched plastic, is used instead of the plastic film 3, the multilayer Preferred for reinforcing the bag.

[Brief explanation of the drawing]

Figures 1 and 2 are partial cross-sectional views of conventional multilayer bags;
The figure is a perspective view showing the laminated state of paper in the multi-layer bag according to the present invention, FIG. 4 is a cross-sectional view thereof, and FIG. 5 is a cross-sectional view of the multi-layer bag according to the present invention. 2...Paper, 3...Plastic film.

Claims (1)

[Scope of utility model registration request] A pair of tapes 4, 4 are applied to the paper 2, and a plastic film 3 is laminated thereon. A multi-layer bag made of paper and plastic film that is wrapped and made into a bag.