ES430564A3 - A method for the extrusion of plates of synthetic thermoplastic materials. (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

A method for the extrusion of sheets of synthetic thermoplastic materials, with a decorative pattern of material extending substantially over the entire width of at least one of the faces of the sheet, comprising the conduct of a first flow plasticized in hot of thermoplastic material comprising at least 75% by volume of the total thermoplastic material in a conduit having a generally circular cross-section, continuously attaching or attaching to the outer surface of said first flow within the first conduit a second minor stream of a second plasticized thermoplastic material comprising less than 25% by volume of the total thermoplastic material with a different color than said first thermoplastic material, forming a single stratified flow of hot plasticized thermoplastic materials conforming to the cross section of said conduit, characterized by different layers cont iguas of said thermoplastic materials with an interface therebetween, which ends at each end at a point of the circumference of said conduit, said composite flow leading along said conduit in the absence of internal and external stimulants to a laminar forming matrix having nozzle edges generally aligned with said interface placed between the two thermoplastic materials, regulating the temperature of each of said main stream and secondary stream of plastic material under real coextrusion conditions to adjust the melt viscosities of said flows or currents so that the melt viscosities differ in a sufficiently high degree to produce a continuous intermediate layer of said plastic material mentioned in second place, said decorative effect of wood when passing through said extrusion die and passing said composite flow of melted materials through the mentions gives matrix. (Machine-translation by Google Translate, not legally binding)