Heating apparatus and process for drawing polyolefin fibers
First Claim
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1. A heating apparatus for drawing ultrahigh molecular weight polyolefin fibers in a one stage draw with continuous heating, said heating apparatus consisting essentially of:
- a first set of rolls;
a plurality of horizontally aligned ovens, said plurality of ovens having one end adjacent to said first set of rolls and an opposite end, said ovens being arranged such that their respective ends are in abutting relationship to thereby provide a relatively long continuous oven such that said fibers are conveyed from said one end of said continuous oven to said opposite end of said continuous oven, anda second set of rolls adjacent to said opposite end of said plurality of ovens, said first and second set of rolls being adapted to provide the desired drawing of said polyolefin fibers and to convey said fibers through said continuous oven.
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Abstract
A heating apparatus and process useful for drawing ultrahigh molecular weight polyolefin fibers, such as polyethylene fibers. The heating apparatus includes a first set of rolls and a plurality of aligned ovens. The apparatus includes a second set of rolls at the exit of the ovens which rolls are adapted to provide the desired drawing of the polyolefin fibers. The apparatus and process provide a single draw step in a heated environment, with the use of preferably four or six horizontal ovens.
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Citations
29 Claims
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1. A heating apparatus for drawing ultrahigh molecular weight polyolefin fibers in a one stage draw with continuous heating, said heating apparatus consisting essentially of:
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a first set of rolls; a plurality of horizontally aligned ovens, said plurality of ovens having one end adjacent to said first set of rolls and an opposite end, said ovens being arranged such that their respective ends are in abutting relationship to thereby provide a relatively long continuous oven such that said fibers are conveyed from said one end of said continuous oven to said opposite end of said continuous oven, and a second set of rolls adjacent to said opposite end of said plurality of ovens, said first and second set of rolls being adapted to provide the desired drawing of said polyolefin fibers and to convey said fibers through said continuous oven. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A process for drawing ultrahigh molecular weight polyolefin fibers, said process comprising passing said fibers through a heating apparatus, said heating apparatus consisting essentially of:
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a first set of rolls; a plurality of horizontally aligned ovens, said ovens being arranged such that their respective ends are in abutting relationship to thereby provide a relatively long continuous oven, said plurality of ovens having one end adjacent to said first set of rolls and an opposite end; and a second set of rolls adjacent to said opposite end of said plurality of ovens, said first and second set of rolls being operated under conditions to provide the desired drawing of said polyolefin fibers, and drawing said fibers between said first set of rolls and said second set of rolls to a predetermined draw ratio in a one stage draw with continuous heating of said fibers, with said fibers being conveyed from said one end of said continuous oven to said opposite end of said continuous oven and through said continuous oven. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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Specification