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US 5,263,308 AGranted
Method for ply-twisting yarns having low levels of finish
AssigneeE. I. Du Pont de Nemours and Company
InventorsDavis E. Lee, Peter M. Murphy
Life of this patent
Estimating the term…
Abstract
This invention relates to an improved method for ply-twisting nylon yarns at twisting speeds greater than 6000 rpm. More particularly, the invention involves coating the nylon fibers with less than about 1% by weight of finish containing an alkyl polyoxyalkylene carboxylate ester lubricant composition. The resulting ply-twisted yarn is especially suitable for use as pile in carpets.
Claims14
In a process for ply-twisting nylon bulked continuous filament yarns, comprising the steps of:
- a) feeding a creel nylon yarn through a tensioning device and onto a storage disc rotating at a speed of at least about 6000 rpm, whereby the yarn emerges from the disc and forms a balloon;
- b) contacting the yarn in the balloon with a balloon limiter as the yarn passes from the disc to a guide;
- and
- c) feeding a bucket nylon yarn through a separate tensioning device where the creel yarn exits from the balloon and wraps around the bucket yarn to form a ply-twisted yarn;
- the improvement comprising, applying to the creel and bucket yarns from about 0.3 to about 1.0% by weight of a finish oil comprising a compound having the general formula:
- ##STR15## where, R.sub.1 is an alkyl chain from 12 to 22 carbon atoms;
- n is 3 to 7;
- m is 1 to 3;
- X is --C.sub.2 H.sub.4 O-- or a mixture of --C.sub.2 H.sub.4 O-- and --C.sub.3 H.sub.6 O--;
- and
- R.sub.2 is an alkyl chain from 1 to 3 carbon atoms.
8 more elements
In a process for ply-twisting nylon bulked continuous filament yarns, comprising the steps of:
- a) feeding a creel nylon yarn through a tensioning device and onto a storage disc rotating at a speed of at least about 6000 rpm, whereby the yarn emerges from the disc and forms a balloon;
- b) contacting the yarn in the balloon with a balloon limiter as the yarn passes from the disc to a guide;
- and
- c) feeding a bucket nylon yarn through a separate tensioning device where the creel yarn exits from the balloon and wraps around the bucket yarn to form a ply-twisted yarn;
- the improvement comprising, applying to the creel or bucket yarn from about 0.3 to about 1.0% by weight of a finish oil comprising a compound having the general formula:
- ##STR17## where, R.sub.1 is an alkyl chain from 12 to 22 carbon atoms;
- n is 3 to 7;
- m is 1 to 3;
- X is --C.sub.2 H.sub.4 O-- or a mixture of --C.sub.2 H.sub.4 O-- and --C.sub.3 H.sub.6 O--;
- and
- R.sub.2 is an alkyl chain from 1 to 3 carbon atoms.
8 more elements
Dependencies are inferred from the claim text.