JPS6151996B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for covering a skin material on a base material such as hardboard or hard fiberboard that is molded into a desired shape.

To manufacture interior panels for automobiles, a base material having suction holes is set in a lower mold having a large number of suction holes, and the periphery of the base material is clamped at an upper position of the base material using a clamping device. A skin material is stretched, and while the skin material is softened by heating, the lower mold is raised to press the surface of the base material to the skin material, and the upper mold is lowered to cover the base material with the skin material. However, if the base material has large irregularities, the skin material will be extremely stretched due to the projections, and the thickness of the part of the skin material that covers the projections will decrease, resulting in a decrease in strength. There are problems in that problems may occur, and the warts formed on the surface of the skin material may disappear and the decorativeness may be impaired.

The present invention has been completed with the aim of providing a method for covering a skin material that solves the above-mentioned problems, and the skin material whose peripheral edge is clamped by a clamping device is placed above a base material set in a lower mold. In a covering method in which the surface of the base material is applied to the base material by stretching the base material and softening the skin material by heating, clamping of the periphery of the skin material is required. The method is characterized in that the clamping is performed at multiple locations using multiple clamping claws arranged at intervals, and part or all of the clamping locations are opened in stages depending on the degree of pressing of the base material against the skin material. It is something.

Next, the present invention will be explained in detail with reference to the illustrated device. Reference numeral 1 denotes a lower mold that can be raised and lowered and is provided with a large number of suction holes 2. An upper mold 3 paired with this is provided so as to be movable up and down,
Further, a square-shaped clamping device 4 is provided between the lower mold 1 and the upper mold 3 so as to surround the outer periphery thereof. The illustrated clamping device 4 has a large number of clamp claws 5 arranged at required intervals on three sides, which are opened and closed at the same time, but only one side is clamped at the same time, but when released from the clamped state. are the clamping claws 5a, 5a, which are performed in stages.
5b, 5b, 5c, 5c are arranged below the required interval, each clamp claw 5a, 5a, 5b, 5b, 5
The opening of c and 5c is performed by a limit switch (not shown), a photoelectric switch, or a timer setting (not shown) that detects the raised position of the lower mold 1.

Using a device configured in this manner, an attempt was made to cover a base material (B) with a convex portion (A) raised upward near the center with a skin material (C) such as a vinyl chloride resin sheet with a bed material layer laminated on the bottom surface. In this case, first, set the base material roll on which the mold surface of the lower mold 1 is coated with adhesive in advance, and attach the clamp claws 5 on three sides of the clamp device 4 and the clamp claws 5a on the other side. 5a, 5b, 5b, 5c, and 5c are clamped at the peripheral portions of the skin material C, and the skin material C is stretched over the base material B to form the state shown in FIG. Next, the lower mold 1 is raised while softening the skin material C by heating the skin material C to a desired temperature using a heating device such as an infrared heater (not shown).
At this time, the clamp claws 5a, 5a, 5b, 5b,
Among 5c and 5c, the central clamp claws 5a and 5a, which are located closest to the protrusion A, are used for detecting the above-mentioned raised position when the protrusion A has risen to a position where a certain degree of tension is applied to the skin material C. The clamped state is released by the action of a limit switch or the like, resulting in the state shown in FIG.
5b is released, and then the clamp claws 5 on both sides
When c and 5c are released, the lower mold 1 stops rising and the upper mold 3 descends, and the skin material C is crimped onto the base material B between the upper mold 3 and the lower mold 1, as shown in FIG. At this point, if necessary, remove the air remaining between the skin material C and the base material B through the suction pores 2 and 2 provided in the base material B. The product is then taken out by cooling for a required period of time and then unclamping by the clamp claws 5 on the three sides. However, according to the method of the present invention, the base material B is pressed against the skin material C which is clamped around the entire periphery. Depending on the degree of pressing of the base material, part or all of the clamped portion is opened in stages so that there is no part that is excessively tensioned by the convex portion A formed on the base material B during the process of being lifted. Therefore, even if there is a convex part (A) on the base material (B), the part of the skin material (C) that covers the convex part (A) will not be excessively stretched and thinned or wrinkled. In order to obtain a finish similar to that of the present invention with the peripheral edge clamped all the way to the end, it was necessary to leave a large margin at the peripheral edge of the skin material where sufficient elongation could be expected, but the margin was almost nonexistent. There are various advantages, such as the ability to effectively utilize the skin material and the ability to downsize the device. In addition, in the above embodiment, the clamp claw that releases the clamp in stages is provided only on one side of the lamp device, but the clamp claws on two, three, or all sides may be released in stages. .

As is clear from the description of the above-mentioned embodiments, the present invention is such that part or all of the clamped portions on the peripheral edge of the skin material are released in stages as the lower mold on which the base material is set is raised. This is an extremely significant contribution to the development of the industry as a method for covering skin materials that can accurately and easily be applied to a base material on which convex portions are formed, with the thickness of each part being approximately equal. It is.

[Brief explanation of the drawing]

1, 2, and 3 are process explanatory diagrams of the method of the present invention, and FIG. 4 is a partially cutaway plan view of an apparatus for carrying out the method of the present invention. 1: Lower die, 4: Clamp device, 5: Clamp claw, 5a, 5b, 5c: Clamp claw.

Claims (1)

[Claims] 1. A skin material whose periphery is clamped by a clamp device is stretched above the base material set in the lower mold, and the surface of the base material is pressed against the skin material while the skin material is softened by heating. In the coating method, the periphery of the skin material is clamped at multiple locations using clamp claws arranged at required intervals to control the degree of pressing of the base material against the skin material. A method for covering a skin material, characterized in that part or all of the clamping locations are opened in stages.