| 摘要 |
THERE IS DISCLOSED A PROCESS FOR THE MANUFACTURE OF A SYNTHETIC PAPER, WHICH PROCESS COMPRISES: (I) MIXING, EXTRUDING, MILLING AND POLYMERIZING A COMBINATION OF FROM 70% TO 80% BY WEIGHT OF INORGANIC MINERAL POWDERS, 29% TO 18% BY WEIGHT OF POLYETHYLENE AND 1 % TO 2 % BY WEIGHT OF ADDITIVES TO FORM GRANULES; (II) FEEDING THE GRANULES INTO A PAPER FILM PRODUCING MEANS WHICH COMPRISES AT LEAST ONE EXTRUDER (10) AND A FORMING MOULD (1) HAVING AN O-SHAPED GATE, WHEREIN THE FORMING MOULD (1) 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 (1); (III) MELTING THE GRANULES IN THE EXTRUDER (10), TRANSFERRING THE MELTED GRANULES TO THE INLET OF THE FORMING MOULD (1), AND MOULDING THE MELTED GRANULES INTO A HOLLOW FILM TUBE (13) WHICH SUBSTANTIALLY CORRESPONDS TO THE O-SHAPED GATE; (IV) COOLING THE TUBE; AND (V) INFLATING AND PULLING AN END OF THE FILM TUBE (3) SO THAT THE FILM TUBE (3) IS STRETCHED IN TWO DIMENSIONS SIMULTANEOUSLY TO FORM THE PAPER, WHEREIN THE RATIO OF THE TENSILE STRENGTH OF SAID PAPER IN THE MACHINE DIRECTION TO THE TENSILE STRENGTH OF SAID PAPER IN THE TRANSVERSE DIRECTION IS IN THE RANGE FROM 1.13:1 TO 1:0.91 AND THE RATIO OF THE TEARING STRENGTH OF SAID PAPER IN THE MACHINE DIRECTION TO THE TEARING STRENGTH OF SAID PAPER IN THE TRANSVERSE DIRECTION IS IN THE RANGE FROM 1.0: 1 TO 1: 1.20.
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