Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Rod – strand – filament or fiber
Patent
1996-10-11
1998-03-31
Edwards, Newton
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Rod, strand, filament or fiber
428373, 428375, 428395, D02G 300
Patent
active
057336563
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a specific polyester filament yarn, a process for producing the filament yarn, a fabric of the filament yarn, and a process for producing the fabric. More specifically, it relates to a polyester filament yarn made by treating a polyester filament composed of a core and fins bonded to the core, with an alkali, whereby the fins are separated from the core and large vacant spaces are formed within the filament yarn; a process for producing the filament yarn; a fabric comprised of the filament yarn and having a soft touch and feeling and high bulkiness; and a process for producing the fabric.
BACKGROUND ART
Polyester fibers, especially, polyethylene terephthalate multifilaments are widely used as a material for clothing. However, polyester multifilaments have a dense fiber structure and thus have a rather stiff touch and a poor bulkiness.
Attempts of enhancing the bulkiness and affording a soft touch have been proposed in Japanese Examined Patent Publication (JP-B) 1-12487 and JP-B 1-16922 that describe bulky filaments characterized by having a body portion and wing portions separated from the body portion, part of the wing portions being broken and having free protruding fiber ends; and further describe splitable filaments from which the bulky filaments can be made.
The splitable filaments are made by extruding a molten polymer through single orifices and therefore the body portion and the wing portions are integrated together, and thus, it is very difficult to separate the wing portions from the body portion. To separate and split the wing portions from the body portion, a physical means causing a large energy transfer, such as a fluid nozzle treatment utilizing a high-pressure compressed air, must be employed. Further, a predominant part of the wing portions thus-separated by such physical means are broken or fibrillated to form free protruding fiber ends, and therefore, the filaments have an appearance like a fluffy spun yarn. A fabric woven or knitted from the filament has a poor uniformity.
JP-B 2-38699 discloses a yarn having 10 to 150 free protruding fiber ends per centimeter, made of synthetic fibers composed of a substantially continuous body portion and wing portions split from the body portion, which have coarse edges and a part of which forms free protruding fiber ends. This yarn also has an appearance like a fluffy spun yarn, and, since the wing portions have coarse edges and fibrils, woven and knitted fabrics made therefrom are of poor uniformity.
A process for imparting a soft and silky touch to a woven or knitted fabric composed of polyester fibers is known (for example, it is described in British Patent 652,948) wherein the fabric is treated with an alkali whereby the weight is reduced and the pressing force applied between adjacent fibers is minimized. This alkali treatment enables only to reduce uniformly the diameter of the polyester fibers and consequently form small vacant spaces among the polyester fibers. Thus the bulkiness of the fabric is enhanced only to a limited extent by the alkali treatment.
DISCLOSURE OF INVENTION
A primary object of the present invention is to provide a polyester filament yarn made by treating a polyester filament composed of a core and fins bonded to the core, with an alkali, to separate the fins from the core and form large vacant spaces within the filament yarn; and a process by which the polyester filament yarn can be produced in an industrially advantageous manner.
Another object of the present invention is to provide a fabric comprised of the polyester filament yarn and having a soft touch and feeling, high bulkiness and uniform appearance.
To achieve the above-mentioned objects, the inventors conducted researches and had the following findings. Where a polyester filament composed of a core extending over the length of filament and a plurality of fins bonded to the core over the length of the core and radially extending from the core is made by a procedure wherein a molten polyester is extruded through a s
REFERENCES:
patent: 4245001 (1981-01-01), Phillips et al.
patent: 4364998 (1982-12-01), Wei
patent: 4381333 (1983-04-01), Okumoto
patent: 5059482 (1991-10-01), Kawamoto et al.
Iohara Koichi
Kuroda Toshimasa
Owaki Shinji
Yoshimura Mie
Edwards Newton
Teijin Limited
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