Roller drafter, process of use, and products produced thereby
First Claim
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1. An apparatus for modifying a strand or strip of fibers including drafting of said strand or strip, comprising:
- at least three pairs of rolls,support means operatively connected to said rolls for supporting each said pair of rolls so that the rolls of each pair are adjacent each other and define therebetween a nip,drive means operatively associated with said rolls for driving said rolls to rotate in a direction of strand or strip movement,wherein distances between nips of adjacent pairs of rolls increase in said direction of strand or strip movement, said rolls each define an outer diameter, both rolls of each pair of rolls define essentially the same outer diameter, and the outer diameter of each pair of rolls increases in said direction of strand or strip movement.
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Abstract
Disclosed is a new roller drafter for drafting and aligning fibers in a strand or strip of card web e.g. for producing filament-wrapped yarn. The improvements include, increasing (in the direction of strip or strand movement) the distances between nips of adjacent pairs of rolls and optionally increasing in said direction of strip or strand movement the outer diameters of each pair of rolls. Also disclosed are, a process utilizing said roller drafter (optionally with filament wrapping), and a drafted strand or strip and a wrapped yarn which are products of the present invention.
16 Citations
27 Claims
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1. An apparatus for modifying a strand or strip of fibers including drafting of said strand or strip, comprising:
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at least three pairs of rolls, support means operatively connected to said rolls for supporting each said pair of rolls so that the rolls of each pair are adjacent each other and define therebetween a nip, drive means operatively associated with said rolls for driving said rolls to rotate in a direction of strand or strip movement, wherein distances between nips of adjacent pairs of rolls increase in said direction of strand or strip movement, said rolls each define an outer diameter, both rolls of each pair of rolls define essentially the same outer diameter, and the outer diameter of each pair of rolls increases in said direction of strand or strip movement. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A process of modifying a strand or strip of fibers including drafting of said strand or strip comprising:
conducting a strand or strip of fibers in a direction of strand or strip movement successively between pairs of rolls of at least three pairs of rolls, each said pair of rolls defining between the rolls thereof a nip, adjusting the distances between nips of adjacent pairs of rolls to increase in said direction of strand or strip movement, said rolls each defining an outer diameter, both rolls of each pair of rolls defining essentially the same outer diameter, and the outer diameter of each pair of rolls increasing in said direction of strand or strip movement, to produce a drafted strand or strip. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
Specification