Three-layer aluminum-plastic profile co-extrusion technology

Abstract

The invention discloses a three-layer aluminum-plastic profile co-extrusion technology. The three-layer aluminum-plastic profile co-extrusion technology comprises the following steps (1) co-extrusion formation, namely conveying an aluminium-inserted profile in a centre hole of a forming mold through an aluminium-inserted profile conveyor, respectively extruding rigid plastic and micro-foaming plastic by using two extruding machines simultaneously, and feeding the rigid plastic and the micro-foaming plastic into an outer-layer inlet and a middle-layer inlet of the forming mold respectively, thus finishing a three-layer composite structure of wrapping the aluminium-inserted profile with two layers of plastic layers in the forming mold; and (2) composite layer formation, namely enabling the composite structure to enter a sizing mold body through a traction tensile force and carrying out cooling formation. The three-layer aluminum-plastic profile co-extrusion technology provided by the invention has the advantages that the pressure of the rigid plastic to the aluminium-inserted profile is relieved by filling the middle of the micro-foaming plastic in an extrusion molding process; a problem that rigid polyvinyl chloride plastic is directly combined with the metal aluminium-inserted profile so that the extrusion molding is difficult to perform is solved, the existing micro-foaming plastic and the metal aluminium-inserted profile are directly combined and formed, the problem that the existing composite profile has not enough surface hardness and brittleness is solved, and the outer layer rigid plastic and the aluminium-inserted profile are firmly combined.

Description

technical field [0001] The invention relates to a three-layer aluminum-plastic profile co-extrusion process, which is mainly used for producing profiles used in door and window frames. Background technique [0002] In the prior art, plastic steel profiles or aluminum profiles were mainly used in the early days. Later, in order to overcome the shortcomings of insufficient strength of plastic steel profiles and poor heat insulation performance of aluminum profiles, co-extruded aluminum-plastic composite profiles were used. This composite profile is made of aluminum The profile is the inner lining, and a layer of micro-foaming outer crust plastic layer (polyvinyl chloride plastic) is compounded on the outside. The main disadvantage of this kind of composite profile is that the skin plastic layer on the outer surface of the micro-foam cannot be made very thick, so its surface hardness cannot meet the requirements of use. In addition, the skinning on the outer surface of the mic...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a three-layer aluminum-plastic profile co-extrusion process to solve the problems of insufficient strength of plastic steel profiles, poor heat insulation performance of aluminum profiles, insufficient surface hardness and brittleness of aluminum-plastic composite profiles existing in the prior art

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