JPH0455839B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for cutting a stack, particularly a stack of metal plates or plastic sheets whose surfaces are coated with a protective film.

Decorative panels, printed materials, or metal plates or plastic sheets with a photosensitive plastic layer are industrially produced with a protective film coated on the surface to protect the surface. In the production process, a stack of metal plates or plastic sheets (hereinafter simply referred to as metal plates) whose surfaces are coated with a protective film is made.
A clamp plate is placed on top of the loaded object, and a knife is lowered along the clamp plate while applying force from above the clamp plate to hold down the loaded object, thereby cutting the metal plate to a predetermined length. , there is an operation to cut into shapes. This situation is depicted in the attached FIG. 1 (partial perspective view). 1st
In the figure, the protective film is symbol 1, the metal substrate is symbol 2,
The metal plate is shown as 3, the clamp plate as 4, and the knife as 5.

Multiple metal plates can be cut into a certain shape by the above operation, but if you try cutting a metal plate using a clamp plate with a normally considered structure, you will notice that the part held by the clamp plate on the metal board The protective film may partially peel off, or wrinkles may appear near the cut edge of the metal plate. This situation is shown in FIG. 2, where the wrinkles are designated as 6.

If wrinkles 6 occur on the metal plate, air will remain trapped between the wrinkled protective film and the metal substrate, and depending on the type of metal substrate,
Particularly in the case of a substrate having a photosensitive layer, air causes deterioration of the metal substrate, which ultimately reduces the commercial value of the metal plate, which becomes an obstacle to the above process.

Therefore, the present inventor conducted studies aimed at solving the above-mentioned problems, and as a result, arrived at the present invention.

According to the structure of the present invention, in the method of cutting a loaded object, a crank plate body and a hardness of 75 mm located at the lowest position are placed above the loaded object, which is formed by stacking a plurality of metal plates or plastic sheets whose surfaces are coated with a protective film. A crank plate made of a laminate in which an intermediate layer of a synthetic resin or synthetic rubber foam having a hardness of 10 to 40 is provided between a non-foam body of a synthetic material having a hardness of 10 to 100 is lowered, and the crank plate is The non-foam body is brought into contact with a protective film covering the surface of the uppermost load, and the load is pressed downward, and then the knife is lowered along the crank plate to remove the load. A method for cutting a loaded object is characterized by cutting.

First, the structure of the clamp plate according to the present invention will be explained. As shown in the perspective view of FIG. 3, the clamp plate 4 is made up of three layers: a plate body 7, a foam 8 of synthetic resin or synthetic rubber (simply referred to as synthetic material), and a non-foamed material 9 of the synthetic material. It has a structure of The synthetic material is polyethylene,
Synthetic resins such as polyurethane, vinyl chloride, resins, fluorine resins, polychloroprene, organic polysiloxanes, and synthetic rubbers such as nitrile rubber, chloroprene rubber, hypalon rubber, and butyl rubber.
The foam has continuous or discontinuous cells and has a hardness of 10 to 40, preferably 15 to 40.
It is 30′. The hardness here is JIS K6301.
-1962 is a value measured using a spring-type hardness tester "Type-C".

On the other hand, the material of the non-foamed body is the same as above, but the hardness is 75-100, preferably 85-90. Further, it is preferable that a cloth made of fibers such as cotton, nylon, or polyester is inserted inside the non-foamed material.

In the present invention, the reason why the hardness is specified as described above is to make it possible to uniformly press the loaded object without deforming the metal plate.

A preferred combination of synthetic materials uses polyethylene as the foam and vinyl chloride resin as the non-foam.

Furthermore, in the present invention, adhesives 10 and 11 are provided between the plate body 7 and the foamed body 8 and between the foamed body 8 and the non-foamed body 9, so that the lower surface of the non-foamed body 9 has a higher frictional resistance than the non-foamed body. It is preferable to provide a layer 12 with a small value.

Next, when using the clamp plate 4, place the clamp plate 4 so that the non-foamed material 9 is in contact with the protective film 1 of the metal plate 3 on the top of the loaded object, and hold the loaded object with a knife as shown in FIG. Cut at 5. As a result, there will be no wrinkles near the end of the cut metal plate, and the product will not be damaged.

The present invention can be widely used for cutting a stack of bonded sheet materials that are easily peeled off.

Next, the effects of the present invention will be explained using examples.

Example A polyethylene 30x foam with a thickness of 3 mm was used as the foam material, and a polyethylene chloride sheet with a thickness of 2 mm thick was used as the non-foam material, and each was attached to the clamp plate body using commercially available double-sided adhesive tape, and then attached to the back side. When the load was cut using a clamp plate made by pasting a non-adhesive kraft paper single-sided adhesive tape on the bottom surface of the vinyl chloride sheet, the protective film hardly peeled off. Ta.

Reference example: A clamp plate created by fixing a 15 mm thick synthetic rubber foam, a 3 mm thick iron plate, and a 2 mm thick cloth-filled synthetic rubber sheet to the clamp plate body using commercially available double-sided adhesive tape using laminated adhesive. When the above-mentioned loaded object was cut using a cutting machine, as shown in FIG. 2, the protective film peeled off in large numbers, each having a width of 1 mm and a length of about 4 to 6 mm. In addition, the protective film on the top metal plate held down by the clamp plate peels off in a linear pattern, and the size of the peeling is often approximately 0.5 mm in width and 100 to 200 mm in length, which significantly impairs the appearance of the product quality. It is often a defective product.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing how a metal plate is cut, and FIG. 2 shows a protective film peeled off in a wrinkled manner from the end face of the cut metal plate. Furthermore, FIG. 3 shows a perspective view of the clamp plate. 1... Protective film, 2... Metal substrate, 3...
Metal plate, 4... Clamp plate, 5... Knife, 6... Wrinkle, 7... Clamp plate body,
8... Foam, 9... Non-foam, 10... Adhesive layer, 11... Adhesive layer.

Claims (1)

[Claims] 1. In the method for cutting a loaded object, above the loaded object, which is formed by stacking a plurality of metal plates or plastic sheets whose surfaces are coated with a protective film,
Hardness of the crank plate body and the lowest part is 75
A crank plate made of a laminate in which an intermediate layer of a synthetic resin or synthetic rubber foam having a hardness of 10 to 40 is provided between a non-foam body of a synthetic material having a hardness of 10 to 100 is lowered, and the crank plate is The non-foam body is brought into contact with a protective film covering the surface of the uppermost load, and the load is pressed downward, and then the knife is lowered along the crank plate to remove the load. A method for cutting a loaded object, which is characterized by cutting the object.