JPS59192561A - Laminated film - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of the Invention) The present invention relates to a laminate film, particularly a crystalline film having low tear strength in the stretching direction, and a reinforcing film frosted thereon.

(Background of invention) For example, as a method for improving the quality of fruits,
As described in Publication No. 74, a devitrified film having a large number of micropores of 500 μ or less in a crystalline Plusbook film is placed under the fruit in the enlargement stage, ripening stage, or harvesting stage. There is something I did.

The plus book film used in the quality improvement method is, for example, poly[thral, polyj'mide, polyL-dylene, Bob I-1 pyrene/)1 +) irru-noyl1
A film obtained by mixing a few percent to several tens of percent of an inorganic fine particulate matter v1 or (, J incompatible (7+) polymer in a crystallized film or polymer is forced to re-assemble. Stretching 7 [RUJ: Sea urchin] This is to produce minute cracks between the resin particles or between the resin and the inorganic fine particles.

This film not only reflects mid-wavelength light, but also
Short wavelength 9, for example, 2 r,) 0 to 390μ culm degree of ultraviolet rays, while ■ Sharp - Determine the surprising benefits.

However, the above-mentioned rough film (1), on the other hand, is extremely weak in tearing strength in the stretching direction, and has the property of tearing ('l') in the cylinder, which is an obstacle in practical use.

As a method for eliminating this problem, it has been considered to laminate a reinforcing film on the back side of the film.

In this case, a reinforcing film is extruded from the film using a T-die or the like, and is continuously pressed onto the laminate 1 using a roller.

However, it has been confirmed that although the reinforcing film is integrally laminated on the entire surface of the film in this way, the reinforcing film is easily torn along the axial direction along with the stretched film. There is.

This is considered to be because the reinforcing film is extruded in a stretched state along its axial direction and is easily torn because it is integrated with the stretched film having low tear strength.

In order to solve this problem, for example, the reinforcing film can be laminated with the reinforcing film perpendicular to the stretched film, but in this case, the lamination work is interrupted each time the reinforcing film is laminated with the reinforcing film perpendicular to the stretched film. As a result, continuous lamination is not possible, which is extremely inefficient and unproductive.

(Object of the invention) This invention is previous)! λ! for a stretched film with weak tear strength in the stretching direction like IS! The goal is to create a strong and continuous laminate.

(Structure and Effects of the Invention) In order to achieve the above-mentioned [1], the present invention is characterized in that the laminate film is formed with discontinuous welded parts (A).

According to the above structure, the laminate film tends to be torn along the stretching direction, but the welded portion of the reinforcing film is discontinuous because it is pressed against the back surface. Because of this, the propagation of the tear is slowed down on the non-welded surface, resulting in an extremely strong laminate film.

In addition, when the present invention is applied to the fruit crystal υ [improving filter 11] as described above, it has extremely high tear strength in actual use, so it can be used repeatedly and does not require care in handling. , being economical, etc.

(Description of Examples) Figures 1 and 2 show a lamination device to which the present invention is applied, in which a stretched crystalline plastic film 1
is wound up on a roll stocker 2, and a reinforcing plastic film 3 is constantly extruded from a die 4 with a predetermined thickness and width, and is welded by a pair of pressure rollers 5.6 and laminated together. At the same time, it is taken up by a take-up roller 7.8 at the tip thereof, wound up by a take-up roller 9, and stored there.

A large number of circular hole-shaped recesses 5a, 5a... are integrally formed on the surface of one roller 5 of the laminating rollers 5.6, so that the laminated films 1, 3 can be are welded together in a discontinuous state except for the four parts.

FIG. 3 shows a laminated film with the discontinuous portion left behind. When this laminated film is torn, the adhesive portion A is easily torn in the stretching direction of the crystalline plastic film 1. However, since the adhesion is not complete in the gap L3, the propagation of tearing is limited to 1 in the gap B, and independent tearing forces are applied to the reinforcing film 3 and the film 1. , since tearing force is applied to the reinforcing film 3 independently,
It exerts its reinforcing effect, and therefore, the propagation of the tear is completely stopped in the non-welded part, so that there is no tearing overall.

In the embodiment, a large number of round non-welded parts are formed, but for example, a cross-shaped non-welded part can be formed as shown in FIG. 4, and this is formed on the surface of the roller. The grooves may be formed in a rut shape, and the pattern of the grooves may be appropriately set to a shape that can prevent the propagation of tearing as much as possible.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a laminating apparatus to which this invention is applied;
FIG. 2 is a perspective view of the laminating roller of the laminating apparatus, FIG. 3 is a perspective view of a laminate film, and FIG. 4 is a perspective view of another embodiment of the laminate film. 1...Crystalline plastic film 3...Reinforcing film △...Welded part B...Non-welded part Patent applicant Kasai Eme 6 Co., Ltd. lz, 7- Figure 1 Figure 2

Claims (1)

[Claims] (1) A reinforced laminate film obtained by welding a reinforcing film to a crystalline film with weak tear strength in the stretching direction, wherein the laminate film has discontinuous welded parts. .