Polypropylene terephthalate twisted yarn and method for...

Details Polypropylene terephthalate twisted yarn and method for... Polypropylene terephthalate twisted yarn and method for...

2001-05-24

2002-06-04

Edwards, Newton (Department: 1774)

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

C428S364000, C428S394000, C057S247000, C057S251000, C057S284000, C057S330000

Reexamination Certificate

active

06399194

ABSTRACT:

TECHNICAL FIELD
The present invention relates to polypropylene terephthalate textured yarn which, while making the most of the softness and stretchability of polypropylene terephthalate, can effectively confer bulkiness and a sense of tightness when in the form of a fabric such as a woven or knitted material; and to an industrially outstanding method for the production thereof.
PRIOR ART
As polyester textured yarn, textured yarn comprising polyethylene terephthalate is outstanding in its crimp characteristics, weatherability and the like, and it is currently widely used. However, there is a need to further enhance the comfort in wearing, and a fibre of high stretchability is demanded. Thus, as described in JP-A-9-78373 and JP-A-11-93026, textured yarns employing polypropylene terephthalate have been proposed. These textured yarns are textured yarns with outstanding stretchability and bulkiness, having an elastic recovery of at least 80% at the time of 50% elongation, a crimp development factor of 200-300% and a crimp recovery of 80%. However, in the case of these textured yarns, drawn yarn is subjected to so-called spindle texturing and the processing rate is slow, being at most 100 m/min, and not only are production costs high but there is also considerable variation between spindles and within a spindle, and there are problems in terms of quality. Furthermore, because of the low Young's modulus of no more than 30 g/d, there are problems in applying tightness.
OBJECTIVE OF THE PRESENT INVENTION
The objective of the present invention is to provide a method for the production of textured yarn of high quality and at low cost from polypropylene terephthalate which is outstanding in its stretchability and bulkiness; together with polypropylene terephthalate textured yarn which, in terms of its handle, is outstanding in its sense of tightness.
DISCLOSURE OF THE INVENTION
The method of the present invention for producing polypropylene terephthalate textured yarn which meets the aforesaid objective is characterized in that, when carrying out texturing at the same time as drawing using a frictional false-twisting machine, at the same time as setting the draw ratio of the polypropylene terephthalate undrawn yarn to 1.05-1.70, the elongation EL (%) of the undrawn yarn and the draw ratio DR are set so that the following relationship (1) is satisfied.
0.585×(1+
EL/
100)≦
DR≦
0.75×(1+
EL/
100)  Realtionship (1)
Furthermore, the polypropylene terephthalate textured yarn of the present invention is characterized in that it is produced by the above method.


REFERENCES:
patent: 3828542 (1974-08-01), Boutonnet et al.
patent: 58-13746 (1983-01-01), None
patent: 9-78373 (1997-03-01), None
patent: 2001164433 (2001-06-01), None

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