Three lager coextrusion foamed board and its use and preparation method

Abstract

An extruded three-layer foam plate used as the casing of container or insulating plate is composed of a high-foamed plastic layer as sandwich layer, and two hard plastic layers are surface layers. Said sandwich layer is prepared by physical foaming, that is, the CO2, propane, or butane gas is directly pumped into extruder.

Description

Technical field: [0001] The invention relates to the technical field of plastic plates, in particular to a composite plastic plate composed of a foamed plastic layer and a hard plastic layer, as well as its application and preparation method. Background technique: [0002] I once submitted to the State Intellectual Property Office on August 13, 2002 a utility model patent application with the patent number 02272457.5 and the name "three-layer co-extruded plastic board". In this application, a composite plastic board was disclosed. It includes a layer of micro-foaming plastic layer, the two surfaces of the micro-foaming plastic layer are respectively covered with hard plastic layers, and the thickness of the micro-foaming plastic layer is larger than the respective thicknesses of the hard plastic layers. The micro-foamed plastic layer and the hard plastic layer can be made of any one of polypropylene, high-density polyethylene, low-density polyethylene, linear polyethylene, p...

AI Technical Summary

Problems solved by technology

[0003] The middle layer of the board is a micro-foamed plastic layer, that is, a low-foamed plastic, which is made by adding a foaming agent to the plastic by a chemical foaming method, with a density of 0.5g / cm 3 ~0.8g / cm 3 , but using low-foaming plastic as the middle layer of the composite sheet, the composite sheet is still heavy

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