| 摘要 |
A process is disclosed for the manufacture of a film suitable for use as a synthetic paper which process comprises: (i) mixing, extruding, milling and polymerizing a combination of from 56% to 80% by weight of inorganic mineral powders, 43% to 18% by weight of polyethylene and 1% to 2% by weight of additives to form granules; (ii) feeding the granules into a film producing means which comprises at least one extruder (10) and a forming mould (1) having an O-shaped gate, wherein the forming mould has at least one inlet thereon each inlet defining an inner passage in the forming mould and communicating with the gate of the forming mould; (iii) melting the granules in the extruder, transferring the melted granules to the inlet of the forming mould, and moulding the melted granules into a hollow film tube (3) which substantially corresponds to the O-shaped gate; (iv) cooling the tube (2); and (v) inflating and pulling (6) an end of the film tube so that the film tube is stretched in two dimensions simultaneously to form the film (4). A composition suitable for use in this process is also disclosed comprising 56% to 80% by weight of inorganic mineral powders, 43% to 18% by weight of polyethylene, and 1% to 2% by weight of additives. <IMAGE> |
