JPS59192562A - 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 bonded thereto.

(Behind the Invention) For example, as a method for improving the quality of fruit, equity BT (54-3
As seen in Publication No. 397'1, a devitrification film having a large number of microscopic voids of 500μ or less in a crystalline plastic film is placed under the fruit in the enlargement stage, ripening stage, or harvesting stage. There is something I did.

The plastic film used in the quality improvement method is, for example, poly 1 sprue, polyamide, polyethylene,
Bob [A film made of 1 pyrene that has been crystallized, or a film obtained by mixing several percent to several tens of percent of fine particulate matter or other incompatible polymers into the polymer. is forcibly stretched again, thereby creating minute cracks between the resin crystals or between the resin and the inorganic fine particles.

This film not only reflects medium wavelength light, but also
It has the desirable advantage of highly reflecting ultraviolet rays with short wavelengths, for example, about 290 to 390 fl, while reflecting less infrared rays with long wavelengths, making the coloring brighter for fruits in the growing stage.

However, on the other hand, the above-mentioned film has extremely low tear strength in the stretching direction (it has a tendency to tear into the cylinder), and this is an obstacle in practical use.

As a method for improving such strength, it has been considered to laminate a reinforcing film on the back side of the film.

In this case, a reinforcing film is extruded onto the film using a T-die or the like, and the reinforcing film is continuously pressed with a laminating roller, or the films are continuously bonded to each other.

However, it has been confirmed that when a reinforcing film is integrally laminated over the entire surface of the film, the reinforcing film is easily torn along the axial direction together with the stretched film.

This means that the reinforcing film is extruded or stocked in a stretched state along its axial direction,
In addition, it is thought that the film is easily torn because it is integrated with the stretched film, which has a low tear strength, via a welding layer or an adhesive layer.

In order to solve this problem, for example, the reinforcing film may be laminated in a state perpendicular to the stretched film, but in this case, the lamination work will be interrupted every time a VI layer is placed perpendicularly to the stretched film. As a result,)! It is not possible to laminate in a continuous state, resulting in extremely inefficient and unproductive work.

(Objective of the Invention) The object of the present invention is to enable strong and continuous lamination of stretched films having low tear strength in the stretching direction as described above.

(Structure and Effects of the Invention) In order to achieve the above objects, the present invention eliminates the use of a laminate film! It is characterized by forming 11 continuous adhesive surfaces.

According to the above configuration, the laminate film tends to be torn along the stretching direction, but since the adhesive surface of the reinforcing film adhered to the back side is discontinuous, the propagation of the tear is prevented by the non-adhesive surface. This results in an extremely strong laminate film.

In addition, when the present invention is applied to a film for improving the quality of fruits as described above, it can be used repeatedly because of its extremely high tear strength and does not require careful handling, making it economical. It has the following advantages.

(Description of Examples) Figures 1 and 2 show a laminating apparatus 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 is 3 is also rolled up in the roll stocker 4. The film 3 is coated with an adhesive layer on its surface by a pair of adhesive application rollers 5.6, and is laminated integrally with the film 1 by a pair of pressure rollers 7.8. After passing through guide rollers 9 and 10, it is wound onto a winding roller 11 and stored there.

As shown in FIG. 3, a large number of circular hole-shaped recesses 5a, 5a, . . . are formed on the surface of the application roller 5. As shown in FIG.

Then, the 5-adhesive Δ is supplied to the 1-ra 5 via the supply drum 13 and the intermediate drum 14 rotating in the adhesive tank 12, and the excess adhesive is transferred to the roller 5.
It is scraped off by the scraping plate 15 that comes into contact with the outer periphery of.

As a result, the adhesive Δ remains only in the four parts 5a and is transferred to the reinforcing film 3 in a discontinuous manner, so that the films 3 and 1 are laminated discontinuously.

FIG. 3 shows a laminated film with the discontinuous portions left behind. When this laminated E film is torn, the portions bonded with adhesive A will be removed from the crystalline plastic film 1. Although it is easily torn in the stretching direction, since there is no adhesive at all in the non-adhesive part B, the tear stops propagating in this non-adhesive part B, and independent tearing forces are applied to the reinforcing film 3 and the film 1. However, since the tearing force is applied to the reinforcing film 3 independently, it exerts a reinforcing effect, and therefore, in the IF adhesive part B,
The propagation of each tear becomes completely one-to-one, so there is no total tear.

A3, in the example, a large number of round adhesive parts Δ are formed, but for example, as shown in FIG.
It is also possible to form an adhesive part in the form of a knurled shape, covering the ffff formed on the surface of the roller (
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 drawings]

FIG. 1 is an explanatory diagram of a laminating apparatus to which this invention is applied;
FIG. 2 is a perspective view showing an adhesive application roller of the laminating apparatus, FIG. 3 is a perspective view of a laminate film, and FIG. 4 is a perspective view showing another embodiment of the laminate film. 1...Crystalline plastic film 3...Reinforcing film Δ...Adhesive B...Non-adhesive portion 71

Claims (1)

[Claims] <1) A reinforced IC laminate film made by adhering a reinforcing film to a crystalline film with low tear strength in the stretching direction via an adhesive, characterized in that the laminate film has discontinuous adhesive parts. and a laminated film to cover it.