Toray Industries, Inc.

Takao Negishi

Kazuo Tomiita

Teiryo Kojima

Kozo Susami

Kouzou Takano

Noboru Ueno

Minoru Shimamune

Jiichiro Okumura

Takuo Ito

Shin-ich Kitazawa

Product of vapor deposition and method of manufacturing same

Method and apparatus for high speed false twist texturing of yarns, which makes it possible to perform false twist texturing smoothly at a yarn speed of 1,000 m/min or higher. The number of false-twists inserted per meter of yarn is determined by Equation 1, while the yarn is false-twisted at a yarn speed satisfying Equation 2 and at a short yarn path length satisfying Equation 3: ##EQU1## wherein T is the number of false-twists inserted per meter of yarn, V is the yarn speed of false twist texturing (m/sec), L is the yarn path length from teed rollers to a false twister (m), and A is a cross sectional area of the yarn (m.sup.2), which is obtained by dividing the denier of the yarn by the density of the yarn. The false-twist texturing apparatus includes feed rollers feeding yarn to a false-twisting zone, a heating device bringing the yarn into direct contact with steam, a cooling device bringing the yarn into direct contact with water, a false twister and delivery rollers, in this order.

Method of false twist texturing and a false twist texturing machine

In the image display device of the present invention, a number of light scattering layers formed on the ends of optical fibers are spotwise distributed on the image display surface, and said scattering layers are comprised of a transparent resin having a granular light scattering material added or very small depressions and projections produced on the surface. Further, the method of manufacturing the image display device according to the present invention is characterized by arranging the end faces of a number of optical fibers to the image display surface, then applying a photosensitive resin onto the image display surface, hardening the resin around the end of the respective optical fibers on the image display surface by the beam of light from the incident surface to form light scattering layers, then removing the unhardened portions. With the image display device thus obtained, an image is transmitted via a number of optical fibers and displayed via a number of light scattering layers, and so a wide angle is provided for the field of vision, and also with the dark colored ground, it is possible to reduce the reflection of the light of disturbance at portions other than the light scattering layers and thus display a clear image of high contrast.

Image display device and its manufacturing method

A method for manufacturing a sewing thread comprising the following steps:

Sewing thread and method for manufacturing the same

Method for manufacturing sewing thread

A specially designed multifilament textured yarn has alternating twists therein. A woven or knitted fabric manufactured from the yarn has a handling similar to that obtained by a hard twist yarn or a true twist yarn and provides pattern with a heather like feeling. In the yarn, S-twist yarn portions and Z-twist yarn portions are alternatingly distributed along the length of the yarn but the non-twisted portion is substantially not included in the yarn. Either S-twist yarn portions or Z-twist yarn portions have a compact twist yarn structure, and the other portions have a bulky twist yarn structure.

Process for manufacturing textured multifilament yarn having alternating

Sewing thread

Textured multifilament yarn having alternating twists

A bulky textured multifilament yarn comprises sections of interlaced individual filaments and sections of non-interlaced individual filaments, wherein the interlaced and non-interlaced sections are formed alternately along the lengthwise direction of the yarn, the filaments in any predetermined length of the yarn are substantially identical in length, and some portions of the individual filaments protrude out from the axis of the yarn. The yarn is made by slackening a multifilament yarn treated by a false twisting operation, and then by interlacing the slackened multifilament yarn by means of a fluid jet stream while taking up the multifilament yarn.

Bulky textured multifilament yarn

Process for making bulky textured multifilament yarn

Disclosed is an apparatus for producing a bundle of fibrous elements, at least some of which are uneven in the thickness in the axial direction thereof, namely some of which include thick portions having a larger sectional area and thin portion having a smaller sectional area. In these fibrous elements constituting the fibrous bundle, the thick portions have, in general, a higher dyeability than the thin portions, and in the fibrous bundle, these higher dyeability portions are formed substantially randomly at a distribution ratio of at least 300 portions per 10 cm of the length of the fibrous bundle. This fibrous bundle is characterized in that it apparently resembles a fibrous bundle composed of fibrous elements uniform in the thickness and dyeability.

Apparatus for producing a bundle of fibrous elements

Disclosed is process for producing a bundle of fibrous elements, at least some of which are uneven in the thickness in the axial direction thereof, namely some of which include thick portions having a larger sectional area and thin portion having a smaller sectional area. In these fibrous elements constituting the fibrous bundle, the thick portions have, in general, a higher dyeability than the thin portions, and in the fibrous bundle, these higher dyeability portions are formed substantially randomly at a distribution ratio of at least 300 portions per 10 cm of the length of the fibrous bundle. This fibrous bundle is characterized in that it apparently resembles a fibrous bundle composed of fibrous elements uniform in the thickness and dyeability.

Method for producing an improved bundle of fibrous elements

Disclosed is a bundle of fibrous elements, at least some of which are uneven in the thickness in the axial direction thereof, namely some of which include thick portions having a larger sectional area and thin portion having a smaller sectional area. In these fibrous elements constituting the fibrous bundle, the thick portions have, in general, a higher dyeability than the thin portions, and in the fibrous bundle, these higher dyeability portions are formed substantially randomly at a distribution ratio of at least 300 portions per 10 cm of the length of the fibrous bundle. This fibrous bundle is characterized in that it apparently resembles a fibrous bundle composed of fibrous elements uniform in the thickness and dyeability. Also a process and apparatus for manufacturing such fibrous bundles are disclosed.

Bundle of fibrous elements

A polyester yarn composed of a plurality of individual fibrous materials such as endless filaments or fibers. Each of these fibrous material is provided with cross-sectional thicker portions, thinner cross sectional portions and intermediate thickness-size portions randomly distributed along the axial direction thereof in a particular condition of distribution of cross-sections of these fibrous material. The above-mentioned polyester yarn involved a textured yarn applied to a drawn polyester multifilament yarn having the above-mentioned basic condition. To produce the polyester yarn according to the present invention, it is the basic condition that the undrawn polyester multifilament yarn should be drawn under a condition of a drawing ratio below a natural draw ratio of undrawn filaments of said undrawn multifilament yarn and a drawing temperature above a crystallizing initiating temperature of said undrawn filaments.

Multifilament yarn having novel configuration and a method for producing

An interlaced multifilament yarn having a balanced compactness and bulkiness, composed of compact and open portions alternately appearing along its length, said compact portions having a fairly uniform configuration of interlacement. The yarn is prepared by bringing a running bundle of filaments in contact with two bending members for bending the thread-line so as to fix the thread-line between them and air jet interlacing the filaments as they pass between the bending members while forming such a stabilized thread-line.

Growing community of inventors

Otsu, Japan

Takao Negishi