SU1184841A1 - Method of manufacturing three-layer panels - Google Patents

Abstract

METHOD OF MAKING THREE-LAYERED PANELS by introducing a facing into the space. layers of laminate of the composition for the preparation of polyurethane foam with its subsequent foaming and cooling of the obtained panel, characterized in that, in order to reduce the distortion of the panels, foaming is carried out first at 35-45 ° C for 4-8 minutes and then at 60 -80 C for 15-35 minutes (Ls

Description

1 The invention relates to the manufacture of plastic products, namely layered three-layer structures, and can be used in furniture industry, shipbuilding, construction in the manufacture of special furniture, light fences, bulkheads, doors, etc. designs. . The purpose of the invention is to reduce the warping of three-layer panels. Example 1. 50 pieces of one batch of decorative paper-layered planes (DBSP) were made. experienced panels on the hanger. three stage temperature conditions and 48 pcs. control panels in a known manner. Experienced panels are prepared by pouring a foam of a urethane composition onto a stand, n heated, up to 40 ° C. Hold the panel at this temperature for 4-6 minutes. Then, for 10–15 minutes, the temperature of the stand plates is raised to and maintained at this temperature for 35 minutes, including the time for the temperature to rise to 35 m for forming the panels. Then, the stand was cooled with water of circulating water supply up to 20-30 ° С (in the following examples, the temperature directives for obtaining panels are abbreviated, for example, 45 ° - 2 40®- 60-20, etc.). 41 Example 2. 58 panels were manufactured using the stepped three-stage temperature regime 40–60 ° –20 °. In the first stage, their molding is carried out at 40 ° C for 4-6 minutes, in the second - at 35 minutes and in the third - the panels are cooled to 20-25 ° C. The output of panels with warping up to 1 mm / running meter is 50%. Example 3. According to the stepwise three-stage temperature regime of 45 ° 20, 54 panels were manufactured. In the first stage, their molding is carried out for 4-5 minutes, in the second - at 30 minutes and in the third - the panels are cooled to 25 -. The output panels with warping up to 1 mm / linear meter are 79.4%. Example 4, According to a stepped three-stage temperature regime of 20 °, 20 experienced and 20 control panels were obtained by a known method. In the first stage, the molding of the experimental panels is carried out at 35 ° C for 6-8 minutes, in the second - at 20 minutes, then the panels are cooled to 30-35 0. The output of the panels with warping up to 1 mm / running meter is 55 %, control panel output 15%. The maximum distortion of the experimental panels was 1.47 mm / running meter, the controls - 3.73 mm / running meter.

Claims (1)

METHOD FOR PRODUCING THREE-LAYER PANELS by introducing into the space between the facing. layers of paper-laminated plastic composition for producing polyurethane foam with its subsequent foaming and cooling of the resulting panel, characterized in that, in order to reduce warpage of the panels, foaming is carried out first at 35-45 ° C for 4-8 minutes, and then at 60-80 ° C for 15-35 minutes. 1 184841