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US 3,940,917 AGranted
Composite elastic yarns and process for producing them
AssigneeE. I. Du Pont de Nemours and Company
InventorDonald Rittler Strachan
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AssigneeE. I. Du Pont de Nemours and Company
InventorDonald Rittler Strachan
Estimating the term…
A composite yarn, which is bulky when relaxed and elongates to at least 100 percent greater length under tension, with quick recovery of the relaxed condition when tension is removed, is composed of uncrimped elastic yarn and at least five relatively inelastic continuous filaments entangled about the elastic yarn to provide protection and desirable textile properties. The composite yarn can be made at unusually high speeds by entangling the relatively inelastic filaments about stretched elastic yarn with jets of high velocity fluid impinged at an angle of 90.degree..+-.45.degree. to the yarn axis, using a filament feed rate which avoids formation of filament loops in the stretched yarn. Examples illustrate combining spandex elastic yarn at 4X stretch with nylon filaments at zero percent overfeed, when using feed rates of up to 789 yards per minute.
A composite yarn comprising uncrimped elastic yarn and at least five synthetic filaments of relatively inelastic material to protect the elastic yarn and provide desirable textile properties, the relaxed composite yarn being bulky and capable of being extended at least 100 percent in length when stretched until the relatively inelastic filaments first become load-bearing;
A process for combining elastic yarn, having a break elongation of greater than 100 percent, with relatively inelastic synthetic polymer filaments to produce a composite yarn, which comprises continuously feeding the elastic yarn with the relatively inelastic filaments through jetted high velocity fluid and impinging the jetted fluid on the yarn axis at an angle of 90.degree. .+-. 45.degree. to separate the filaments and entangle the filaments tightly around the elastic yarn in intermittent zones of random braided structure, the elastic yarn being fed under tension sufficient to extend the yarn to at least 100 percent greater length than its relaxed length, and the relatively inelastic filaments being fed at a rate which provides between 2 percent net underfeed and 2 percent net overfeed to the jetted fluid.
Dependencies are inferred from the claim text.