JPS5812723A - Manufacture of laminated board - Google Patents

Abstract

PURPOSE:To obtain an inexpensive laminated board which is prevented from the production of burr, by a method wherein thermosetting resin is impregnated in a base material and dryed to obtain a prepreg, the prepreg is preliminarily cured by heating and pressurizing the periphery thereof, and a plural number of the prepregs is laminated and molded by heating and pressurizing. CONSTITUTION:Thermosetting resin varnish, i.e., phenol resin, is impregnated and dried over a whole surface of a base material, i.e., paper, to obtain a prepreg, and the periphery of the obtained prepreg 1 is preliminarily cured by heating and pressurizing it preferably at 100-150 deg.C, under 5-15kg/cm<2> and for 2-5sec by means of upper and lower molds 2 and 3 in which a heater constituted in a squre is installed. A plural number of the prepregs, superposed with each other, is molded by heating and pressurizing to obtain a desired laminated board.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a laminate used for decorative boards, etc., which includes pre-curing the peripheral portion of a prepreg obtained by impregnating a base material with a thermosetting resin and drying it by heating and pressurizing the prepreg; Next, a method for manufacturing a laminate board is provided, which is characterized in that a plurality of prepregs are laminated and molded under heat and pressure.

When producing a laminate by stacking multiple sheets of Repreg obtained by impregnating and drying a thermosetting resin into a base material such as paper, and molding them under heat and pressure, There was a problem in that the resin in the peripheral area was pushed out by the flow of resin in the central area, and the resin flowed out to the peripheral edge of the laminate, causing cracks.

Conventionally, the amount of resin impregnated into the periphery of the base material was reduced or not impregnated at all to prevent the resin from flowing out, or the periphery of the base material was sealed with tape or the like. It also prevented the resin from flowing out. However, the former method required very long distances, and the latter method was expensive and impractical.

The present invention has been made in view of the above points, and an object of the present invention is to provide a method for manufacturing a laminate that can be formed easily, without increasing costs, and without producing a single burr. That is.

The present invention will be explained below with reference to Examples. The peripheral part of the print register (1) obtained by impregnating the entire surface of a base material such as paper with a thermosetting resin varnish such as phenol resin, urea resin, or melamine resin and drying it is precured. That is, as shown in the attached figure, high heat (100,
150" (1), high pressure (5kg/7" L51cg/c
rd) for 2/-5 seconds to pre-cure only the periphery of the lary ridge [+]. A laminate is obtained by stacking a plurality of pre-cured sheets with only the peripheral portions precured in this manner and molding them under heat and pressure according to a conventional method. During this lamination molding, the peripheral part of the pre-register is hardened in advance, so even if the resin in the center of the pre-register melts due to heat and pressure,
This molten resin is dammed up by the hardened resin in the peripheral area, and there is no fear that the resin will flow out from the peripheral edge of the laminate and cause flakes.

As mentioned above, in the present invention, the peripheral part of the pre-register is heated and pressurized to pre-cure, and then a plurality of sheets of the pre-register are laminated and heated and pressurized, so that the peripheral part is pre-cured. It is possible to prevent the resin from flowing out, and there is no need to adjust the amount of resin impregnated into the base material, seal processing, etc., and it is simple and cost-effective. It is possible to manufacture laminates.

[Brief explanation of the drawing]

The attached figure is a perspective view showing one step in an embodiment of the present invention, and is a +1+crisp register.

Claims (1)

[Claims] (1) The peripheral part of the prepreg obtained by impregnating and drying the base material with a thermosetting resin is precured by heating and pressing, and then multiple sheets of this prepreg are laminated and molded by heating and pressure. A method for manufacturing a laminate.