Forming die of thermoplastic sheet material

Abstract

The invention relates to a forming die of a thermoplastic sheet material, comprising an upper backing plate, a lower backing plate, and a molding frame, wherein, the molding frame is arranged between the upper backing plate and the lower backing plate, the surfaces of the sheet material of the upper backing plate and the lower backing plate are flat, and the mouding surface is coated with a teflon coating or a mold lubricant coating. By using the die disclosed in the invention, the material formed in hot pressing cold pressing unit has a density of 0.3-12, and the surface of the material is flat without warp.

Description

technical field [0001] The invention relates to the technical field of thermoplastic plate production, in particular to a molding die for thermoplastic plate. Background technique [0002] The mold for pressing plastic sheets with a flat press is usually made of cold-rolled sheets, manganese sheets and other materials. After being heated, these materials will warp and deform due to uneven heating. Fortunately, the pressure of hot pressing and cold pressing (usually All at 300 tons / m 2 pressure) to restore the mold deformation, so as to obtain a flat sheet, but this kind of plastic sheet, whether it is wood-plastic, PVC, or polypropylene, its bulk density is above or the same as the density of these materials themselves, otherwise the sheet If the surface is formed, it will be short of material and uneven, and its strength will decrease accordingly. [0003] The purpose of the present invention is to form thermoplastic materials such as glass fiber and polypropylene or foam...

AI Technical Summary

Problems solved by technology

[0002] The mold for pressing plastic sheets with a flat press is usually made of cold-rolled sheets, manganese sheets and other materials. After being heated, these materials will warp and deform due to uneven heating. Fortunately, the pressure of hot pressing and cold pressing (usually All at 300 tons / m 2 pressure) to restore the mold deformation, so as to obtain a flat sheet, but this kind of plastic sheet, whether it is wood-plastic, PVC, or polypropylene, its bulk density is above or the same as the density of these materials themselves, otherwise the sheet If the surface is formed, it will be short of material and uneven, and its strength will decrease accordingly

[0003] The purpose of the present invention is to form thermoplastic materials such as glass fiber and polypropylene or foaming materials, whose density is below the density of the material itself, and the pressure during cold pressing is relatively low. If mold materials such as hot-rolled plates and manganese plates are used, their The deformation after being heated on the hot press cannot be recovered, resulting in deformation of the plate

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