Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Rod – strand – filament or fiber
Patent
1996-12-19
1998-01-13
Cannon, James C.
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Rod, strand, filament or fiber
10617047, 10617051, 10617053, 1061711, 26417713, 26417714, 264211, 428398, 428400, D01F 230, D01D 102, D01D 504, D01D 5253
Patent
active
057077371
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a cellulose acetate fiber which has a non-circular cross-sectional form having a contour formed of smooth curves or formed of smooth curves and straight lines; multi-filaments thereof; a spinning dope for the production thereof; and a process for the production of the fibers.
More specifically, it relates to a cellulose acetate fiber of which the cross section is non-circular, uniform in form and almost free of creases; multi-filaments thereof; a spinning dope for the production thereof; and a process for the production of the fibers.
Prior Art
A cellulose acetate fiber (to be also referred to as "acetate fiber" hereinafter) has excellent color-developing properties and a dry feeling, and exhibits its excellent properties as a material for fashionable clothing. In recent years, however, consumers' needs for textiles are upscaled and diversified, and it is therefore desired to improve the cellulose acetate fiber further.
An acetate fiber is formed by dry spinning in which a spinning dope prepared by dissolving acetate flakes as a source material in a solvent such as acetone or methylene chloride is spun through a spinneret and the solvent is evaporated in a spinning cylinder. Therefore, even if the spinning dope is spun through circular spinning orifices of the spinneret, the acetate fiber has cross sections having a number of concavo-convex forms or creases at a step where it is taken up in the form of yarns. It is presumed that the above takes place for the following reason. When yarns are dried in the spinning cylinder, exterior portions of the yarns are first dried to form skins, and then, the solvent inside is removed by evaporation to allow the first-formed skin portions to partially dent into the inside and form concavo-convex forms or creases.
Conventionally, methods of devising the spinneret have been conducted as means of altering the cross-sectional form of an acetate fiber.
For example, in Japanese Patent Publication No. 37-7917, an attempt is made to spin a spinning dope through a spinneret having triangle- or square-shaped orifices. In Japanese Laid-open Patent Publication No. 60-134012, a plurality of spinning orifices having specific cross-sectional forms are provided at specific intervals to obtain an acetate fiber having Y-shaped cross-section. In Japanese Laid-open Patent Publication No. 3-59105, an attempt is made to obtain a cross-sectionally hollow acetate fiber with a dual-tube type spinneret in which an inner tube is projected beyond an end surface of an outer spinneret and the diameter and the length of a spinning portion are adjusted to be in specific ranges.
Since, however, the above prior art techniques employ dry spinning basically, the drying state of a solvent cannot be altered in any attempt and it is difficult to form yarns of which the concave portions and convex portions are uniform in number and hence, it is impossible to prevent the inclusion of filaments which are non-uniform in cross-section and are considerably deviated from an intended form.
Problems to be Solved by the Invention
It is a first object of the present invention to provide an acetate fiber having a non-circular cross sectional form, i.e., a hetero-cross sectional form, the non-circular cross-sectional form having a contour formed of smooth curves or formed of smooth curves and straight lines, which have not been obtained by the conventional spinning methods.
It is a second object of the present invention to provide an acetate fiber whose cross-sectional form has a contour substantially free of creases and small dents and which is therefore excellent in gloss and feeling.
It is a third object of the present invention to provide acetate fiber multi-filaments which are relatively uniform and nearly substantially the same in cross-sectional form and whose cross sections have contours formed of smooth curves or formed of smooth curves and straight lines when the multi-filaments are produced through a spinneret having orifices having the
REFERENCES:
patent: 4276173 (1981-06-01), Kell et al.
patent: 4543221 (1985-09-01), Chen et al.
patent: 5236474 (1993-08-01), Schofield et al.
patent: 5458963 (1995-10-01), Meirowitz et al.
Mori Hiroyuki
Nose Kenkichi
Cannon James C.
Teijin Limited
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