Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Rod – strand – filament or fiber
Patent
1984-08-09
1990-03-13
Kendell, Lorraine T.
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Rod, strand, filament or fiber
428362, 428364, D02G 300
Patent
active
049082698
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a crimped Polyester-yarn obtained from cold drawn Polyester-POY as well as a process for its manufacture and the application of such yarns.
The DE-AS No. 12 91 852 concerns a process for the manufacture of fibres, yarns or films from crystallizable Polyester, by slow melt spinning, subsequently warm drawing and after that thermal shrinkage of the yarns or films. The thus obtained fibres, yarns of films may be irreversible lengthened by moderate heat treatment, without that a tension is exercised on them, and they no more return on their original length by cooling and drying.
The cold drawing of Polyester-POY (=Partially Oriented Yarn) is not very spread. But nevertheless it is known: TEIJIN mentions in the Japanese Application No. 0 055 268 of 16.5.77 the cold drawing in a draw ratio of 1.05-1.35 of a Polyester yarn spun between 4000 and 7000 m/min. The literature does not mention the possibility of aftertreatment of such yarns. The present invention concerns a new yarn, which is manufactured by an aftertreatment of a cold drawn Polyester-POY.
The invention concerns a crimped Polyester-yarn, obtained from cold drawn Polyester-POY-yarn, characterised in that the stress/strain course between 10 and 30% elongation resulting from the stretch test corresponds to a secant modulus of 0-100%.
We designate as secant modulus the end value of a straight line, defined by the stress by 10 and 30% elongation, parallel shifted on stress 0 by elongation 0. The unity corresponds to the percentage portion of the breaking stress by 100% theoretical elongation.
Hereafter the definition of the secant modulus will be precisely explained in relation with FIG. 1. It is already possible to mention, that the stress/strain diagram shows a marked plateau zone, which characterises the yarn according to the invention.
These yarns are twistless and totally shrunked. The crimp is three dimensional, optically interesting and presents a fine appearance. The crimp of the individual fibrils is irregular.
If here one speaks of Polyester-POY, endless yarns are concerned, which are spun between 2000 and 5000 m/min. The cold drawing takes place at room temperature on a draw machine, for example a drawtwist- or draw-wind machine, with a draw ratio of 1.2 to 2.2. The denier of the individual filaments is not critical.
The invention further concerns a process for the manufacture of the above mentioned crimped yarns, by which cold drawn Polyester-POY-yarns are subjected to a thermal treatment. The thermal treatment is carried out in the air, vapour or inert liquid. One understands under inert liquid, a liquid, in which Polyester does not dissolve, and which does not react with the Polyester. Water is preferred as such a liquid. The yarn simultaneously shrinks very largely (up to 60%) by the treatment.
The shrinkage force of the cold drawn Polyester-POY-yarn nevertheless is very small, so that already smallest stresses could reduce or even prevent the shrinkage. The thermal treatment is therefore carried out tensionless or under controlled overfeed. The overfeed varies between 20 and 100%, preferably between 40 and 80%.
The thermal treatment preferably takes place in a shocking way. Under shocking way treatment one understands here a sudden, short-term warming up of the yarn or by wet treatment a bringing in of the article in the warmed-up bath.
One works in the air at a temperature of more than 80.degree. C., preferably between 140.degree. and 220.degree. C., continuously, under controlled overfeed of 20-100%, preferably of 40-80%. A convection heater is advantageously used for the thermal treatment of the yarn.
If the thermal treatment is carried out in steam or inert liquid, it occurs at a temperature of more than 60.degree. C., preferably at 90.degree.-100.degree. C., tensionless, respectively with a controlled overfeed of 20-100%, preferably of 40-80%. Steam means saturated steam or overheated water steam.
The crimp of the yarn according to the invention is irregular and stress sensitive. The further processing of the yarn
REFERENCES:
patent: 2758908 (1956-08-01), Kolb
patent: 3680301 (1972-08-01), Michel
patent: 3691748 (1972-09-01), Buzano
patent: 3816992 (1974-06-01), Frankfort et al.
patent: 3953962 (1976-05-01), Breen
patent: 4414169 (1983-11-01), McClary
Schaffner Paul
Specker Hugo
Kendell Lorraine T.
Viscosuisse S.A.
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