Patent ID: 6103161
Filing Date: 2000-08-15
Classification: B29C

Abstract:
Procedure for manufacturing coextruded sheets, by which a sheet is obtained that is provided with a plurality of longitudinal strips of various colours, the sheet being formed from various layers including a lower supporting layer, an intermediate layer comprising a plurality of longitudinal colored strips and a bright finishing upper layer, characterized in that the sheet is produced by selectively controlling the pressure, speed, flow volume and maintaining the temperature between 190.degree. C. and 300.degree. C. of the material for forming the various layers such that:(i) the lower layer comprises approximately between 5 and 50% of the total structure; the intermediate layer comprises approximately 20 to 80% of the total structure; and the upper layer comprises approximately 2 to 20% of the total thickness,(ii) the thickness of the sheet being varied between 0.3 and 2.4 mm,(iii) the respective widths of the strips in the intermediate layer being varied between 3 and 600 mm;simultaneously superimposing the various layers;extruding the various superimposed layers for forming the sheet;cooling the sheet down to a preset temperature; andcutting the sheet to a preset length.