Textiles: spinning – twisting – and twining – Apparatus and processes – Twist setting
Reexamination Certificate
1998-11-24
2001-06-12
Stryjewski, William (Department: 3765)
Textiles: spinning, twisting, and twining
Apparatus and processes
Twist setting
C057S284000, C028S249000
Reexamination Certificate
active
06244031
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a composite textured yarn consisting of component yarns that have respective shrinkages that are different from one another, more particularly, a composite textured yarn favorable for obtaining a soft, and highly tensile, firm and resilient fabric.
A composite textured yarn having a core-sheath structure obtained by feeding together and false twisting two yarns that are different from one another in elongation is well known. This method can provide a highly crimped and highly bulky composite textured yarn with a core-sheath two-layer structure consisting of a component yarn lower in elongation as the core and another component yarn higher in elongation as the sheath, and the composite textured yarn is used as a material for worsted-like woven and knitted fabrics for general purposes.
2. Related Art
On the other hand, JP-A-06-057562 discloses a process for producing a composite textured yarn having excellent bulk and softness by crimping a component yarn (B) fed at a faster feed rate around another component yarn (A) fed at a slower feed rate, at a position between a false twisting heater and a spindle.
However, these conventional processes have problems in that since the composite textured yarn is highly crimped and highly bulky, glitter detrimental to fabric appearance, softness and to the aesthetic feel of the fabric occurs, and in that the thermal insulation performance important for the feeling or wearers of autumn and winter clothes is insufficient. These problems are solved by additional twisting in the case of the former process, and by using a yarn that is polygonal in cross section in the case of the latter process. However, these processes are not regarded as satisfactory enough, and no fabric having a sufficiently good fabric feeling having regard to tension, firmness, resilience, and thermal insulation performance, especially as compared with wool fabrics, has been obtained hitherto.
SUMMARY OF THE INVENTION
The present invention addresses the problem of solving the above mentioned disadvantages of the prior art, so as to provide woven and knitted fabrics having excellent softness and which nevertheless are highly tensile, firm and resilient.
According to one aspect, the present invention provides a composite textured yarn which comprises at least a component yarn A and a component yarn B each false twisted and crimped, the component yarn B having a length shorter than or, at least when subjected to heat treatment a shrinkage greater than, the length or shrinkage respectively of the component yarn A; and single fibers of the component yarn B, at least after heat treatment, having, arranged longitudinally of each said single fiber of component yarn B, successively alternating thick and thin portions of the said fiber.
According to another aspect, the invention provides a woven or knitted fabric comprising such a composite textured yarn.
According to a further aspect, the invention provides a process for producing a composite textured yarn, which process comprises the steps of bringing together at least two component yarns A and B and feeding to a false twister and thereby false twisting, the component yarns A and B, characterized in that, when brought together, the component yarns A and B are at respective temperatures different from one another.
According to a still further aspect, the invention provides an apparatus for producing a composite textured yarn comprising at least two yarn components A and B, which apparatus comprises
means for controlling the temperature of at least one of the yarn components A and B such that the yarn components A and B are at respective temperatures different from one another,
guide means for bringing together each of yarns A and B when at different respective temperatures,
means for feeding the component yarns A and B to a false twister and
a false twister for false twisting the component yarns A and B.
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Kai Tsugihiko
Kunisada Hideaki
Murakami Kakuji
Miller Austin R.
Stryjewski William
Toray Industries Inc.
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