Toray Industries, Inc.

Yoshiharu Okumura

Katsutoshi Ando

Nobuo Kurata

Kouji Sugano

Hiroshi Takahashi

Yuhei Maeda

Katsuya Ogawa

Eiichi Nishiura

Mitsuko Oka

Katsunori Matsuda

Yoshikazu Ii

A method for melt-spinning synthetic fiber, characterized by using a spinning device of which the part to be contacted with polymer in melt is coated with a film of an oxide, nitride or carbide of any of Si, Ti, Zr, Al, W, B, Ta and Ge or with a film of heat-resistant resin.

Process of melt-spinning synthetic fiber

Disclosed are a process for producing a tubular nonwoven fabric and tubular nonwoven fabrics produced by the same. In the process, a web is formed on a first rotating cylinder by catching fibers carried to the surface of the first rotating cylinder by a fluid, the web is transferred to a second rotating cylinder, a tube of the transferred web is formed on and around the second rotating cylinder, and the tube is drawn in the axial direction of the second rotating cylinder to form a tubular nonwoven fabric. The tubular nonwoven fabric with a high unit weight can be produced without elongating or breaking the nonwoven fabric, and the diameter of the tubular nonwoven fabric can be freely changed.

Electret tubular nonwoven fabric comprising circumferentially oriented

Tubular nonwoven fabric comprising circumferentially oriented parallel

Process for producing a tubular nonwoven fabric and tubular nonwoven

A packaging material according to the present invention includes an electret material having a surface part mutually different polarized electric charges on a front surface and a rear surface thereof. A method of packaging according to the present invention includes covering at least a portion of an object using the packaging material.

Packaging material made of electret material and packaging method

Protective sheets having self-adhesive property used for wearing on

A method for filtering liquids having a dielectric constant less than 10 is disclosed. The method includes the step of filtering a liquid through a porous layer of an electret, the electret consisting of a fibrous sheet having a surface charge density of at least 5.times.10.sup.-11 coulombs/cm.sup.2, wherein on the upstream side of the electret is laminated another porous layer having at least a porosity or an average fiber diameter greater than that of the electret layer. The upstream layer may consist of either a fibrous electret layer, or an uncharged fibrous layer.

Filter for liquid and method of filtering liquid

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Otsu, Japan

Yoshiharu Okumura