(19)
(11) EP 0 330 181 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
16.05.1990 Bulletin 1990/20

(43) Date of publication A2:
30.08.1989 Bulletin 1989/35

(21) Application number: 89103092.6

(22) Date of filing: 22.02.1989
(51) International Patent Classification (IPC)4: D01F 9/145, C04B 35/52, D04H 1/54, C04B 30/02
(84) Designated Contracting States:
DE FR GB

(30) Priority: 26.02.1988 JP 41974/88

(71) Applicant: PETOCA Ltd.
Chiyoda-ku, Tokyo-to (JP)

(72) Inventors:
  • Sekido, Masao c/o Kashima Seiyusho of
    Kashimagun Ibarakiken (JP)
  • Takamatsu, Akio c/o Kashima Seiyusho of
    Kashimagun Ibarakiken (JP)

(74) Representative: Kraus, Walter, Dr. et al
Patentanwälte Kraus, Weisert & Partner Thomas-Wimmer-Ring 15
80539 München
80539 München (DE)


(56) References cited: : 
   
       


    (54) Process for producing non-woven fabrics of high bulk density carbon fibers


    (57) A process for producing non-woven fabrics having a high bulk density, uniform porosity and little charac­teristic of so-called interlayer detachment are provided by subjecting an infusiblized sheet of pitch fibers to a heat treatment at a temperature higher than the softening temperature of the pitch fibers and lower than the soften­ing temperature plus 300°C, while applying a pressure to the surface of said sheet substantially in the vertical direction thereof.





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