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Semiconductor manufacture

Non-woven-fabric-and-method-for-producing-same

Method for forming shallow source/drain extension for MOS transistor

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FIG. 2 shows a trenched DMOS transistor structure in accordance with the present invention. The ...

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DMOS power transistors with reduced number of contacts using integrated body-source connections

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Trench depletion MOSFET

The present invention is a trench power MOSFET with a unique structure which overcomes the above-...

***WITHDRAWN PATENT AS PER THE LATEST USPTO WITHDRAWN LIST*** *** NO IMAGES AVAILABLE***

Description:...

Method for forming a MOSFET with substrate source contact

Accordingly, it is an object of the present invention to provide an improved means and method for MO...

Integrable MOS and IGBT devices having trench gate structure

OF ILLUSTRATIVE EMBODIMENTS FIG. 3 is a section view of a power MOSFET device in accordance with ...

Non-woven fabric and method for producing same

Details

Inventors: Murakami, Kakuji; Nakayama, Takashi; Morioka, Atsumi;
Assignee: Toray Industries, Inc. (Tokyo, JP)
Primary Examiner: Bell; James J.
Assistant Examiner:
Attorney, Agent or Firm: Miller; Austin R.

A non-woven fabric suitable for clothing manufacture, comprising a fiber web substantially formed of a continuous filament of a synthetic fiber, wherein a plurality of weakened portions in a form of a scratch or a crack are distributed on the filament constituting at least one surface of the fiber web. Some of the weakened portions are broken to form free ends, some of which are projected from the fabrice surface to form a short fluff, and some of the remaining ends are embedded in the interior of the fiber web and entangled with the filament. The weakened portions of the filament are provided by nipping the fiber web between a pair of rollers, at least one of which has a rough surface formed of a plurality of prominences of hard particles. A punching treatment of the fiber web after the weakened portions has been imparted is effective for breaking the filament to form short fluffs on the fabric surface and for entangling the filaments with each other. A resin treatment before the punching treatment is also favorable.

DETAILED DESCRIPTION It is a primary object of the present invention to eliminate the above drawbacks of the prior art and to provide a unique non-woven fabric and a method for producing the same, which fabric is highly resistant to "pilling" or "napping" and has an excellent weight reduction, drapery, resiliency and touch suitable for clothing manufacture.
It is a second object of the present invention to provide a non-woven fabric and a method for producing the same, which fabric has a further improved resistance to "pilling" or "napping" while retaining the other above favorable properties by a resin treatment using a lower volume of resin.
According to a first aspect of the present invention, there is provided a non-woven fabric suitable for clothing manufacture, comprising a fiber web formed substantially of a continuous filament of synthetic fiber, wherein a plurality of weakened portions in the form of scratches or cracks are distributed on the filament constituting at least one surface of the fiber web; some of the weakened portions being broken to form free ends; some of the free ends being projected from the fabric surface to form naps and some of the remaining ends being embedded in the interior of the fiber web and entangled with the filament.
According to a second aspect of the present invention, there is provided a method for producing the abovesaid non-woven fabric from a starting fiber web prepared by collecting a continuous filament of a synthetic fiber, comprising a weakening treatment in which the starting fiber web is nipped between a roller system or a plate system, at least one element of the system having a rough surface provided by a plurality of particles of hard material so that weakened portions are imparted to the filament constituting the surface of the fiber web, and a punching treatment, in which the fiber web is punched so that the filaments are entangled with each other.
If necessary, a resin may be coated on or impregnated in the fiber sheet at the appropriate stage after the fiber web is formed

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