A method for the production of warm white and which can be of various not fiber-forming polyolefin films

摘要

Non-fibrillating thermo-weldable films are made from two layers of the same polyolefinic material, following a sequence of operations essentially comprising the extrusion of a base film, cooling and longitudinally stretching it under defined conditions, extruding a relatively thin coating of the same polyolefinic material onto the base film and then transversely stretching the composite film under defined conditions. Typically, an extruded film of isotactic polypropylene is cooled to 40 DEG C., stretched 1:5. coated at a base/ coat ratio of 8:1 and stretched transversely 1:8. The polyolefinic material should be a crystalline alpha-olefine polymer or copolymer or a mixture of such. IMAGE