Surface treatment for blanket of thermoplastic fibers
First Claim
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1. An apparatus for forming a densified surface layer on a thermoplastic blanket, comprising:
- a first continuous belt;
a second continuous belt;
a treatment zone defined between said first and second belts;
a first heating and densifying unit including a first platen, a second platen, means for heating said first platen including a first electric variable heating circuit, means for heating said second platen and means for displacing said first platen, wherein said first electric variable heating circuit includes watt densities in graduated steps;
a second heating and densifying unit downstream from said first heating and densifying unit; and
a cooler downstream from said second heating and densifying unit.
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Abstract
An apparatus and method are provided for forming a densified surface layer on a thermoplastic blanket. The apparatus includes first and second continuous belts, a treatment zone defined between those belts, first and second heating and densifying units and a cooler downstream from the heating and densifying units. The method includes the steps of continuously forming a densified surface layer on a face of a thermoplastic blanket and making the thermoplastic blanket with the densified surface layer to a desired thickness within strict dimensional tolerances. A densified thermoplastic blanket product is also disclosed.
33 Citations
18 Claims
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1. An apparatus for forming a densified surface layer on a thermoplastic blanket, comprising:
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a first continuous belt; a second continuous belt; a treatment zone defined between said first and second belts; a first heating and densifying unit including a first platen, a second platen, means for heating said first platen including a first electric variable heating circuit, means for heating said second platen and means for displacing said first platen, wherein said first electric variable heating circuit includes watt densities in graduated steps; a second heating and densifying unit downstream from said first heating and densifying unit; and a cooler downstream from said second heating and densifying unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification