Mitsubishi Chemical Corporation

Tetsu Yasunami

Youji Hatanaka

Nobuyuki Yamamoto

Atsushi Kawamura

Tadao Samejima

Hiromasa Inada

Keishi Mizuno

Tadanobu Ikeda

A horizontal heat treatment device continuously subjects an untreated continuous flat object to heat treatment while horizontally transferring the untreated object within a heat treatment chamber. Seal chambers are interconnected to the untreated-object loading opening and treated-object unloading opening of the heat treatment chamber. A passage is connected to an opening of each of the seal chambers, the opening located on the side opposite the heat treatment chamber. The untreated-object passage loading opening interconnected to the untreated-object seal chamber loading opening and the treated-object passage unloading opening interconnected to the treated-object seal chamber unloading opening are the untreated-object loading opening and treated-object unloading opening of the heat treatment device. A pair of gas ejection nozzles are provided at upper and lower positions of the passages. The nozzles eject gas in specific directions, and the nozzle openings have a specific shape, a direction, and a length.

Horizontal heat treatment device

A carbon-fiber-precursor acrylic fiber bundle which can smoothly pass through a flame-resistance impartation step and a carbonization step. The carbon-fiber-precursor acrylic fiber bundle has a high-density part as a portion thereof, wherein the high-density part satisfies the following requirements (A) and (B). Requirement A: The high-density part has a maximum fiber density &#x3c1;of 1.33 g/cmor higher. Requirement B: The portion extending between an intermediate-density point and a maximum-density-region arrival point has an increase in fiber density of 1.3&#xd7;10g/cmor less per 10 mm of the fiber bundle length.

Carbon fiber precursor acrylic fiber bundle, method for thermally oxidizing part thereof, thermal oxidation oven, and process for producing carbon fiber bundle

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Aichi, Japan

Tetsu Yasunami