Global Patent Index - EP 0979895 A1

EP 0979895 A1 2000-02-16 - Method and device for refining fibres

Title (en)

Method and device for refining fibres

Title (de)

Verfahren und Vorrichtung zum Raffinieren von Fasern

Title (fr)

Procédé et dispositif pour raffiner des fibres

Publication

EP 0979895 A1 (EN)

Application

EP 98202705 A

Priority

EP 98202705 A

Abstract (en)

A fibre shortener comprises at least two extrusion screws (1,2) having each: a rotational axis for rotation in a positive direction (8), at least two transport sections provided with transporting screw threads (15) of positive pitch; and at least one reversed screw section provided with a reversed screw thread (16) of negative pitch and being arranged between said transport sections; the extrusion screws being arranged in parallel relation for intermeshing corotation: and each reversed screw thread being provided with at least one window (10) providing a passage through the respective reversed screw thread. In the reference plane defined by the respective reversed screw thread, each window has an essentially rectangular cross section. The width of the cross section of each window is chosen in dependency of the desired fibre length of fibres to be obtained, wherein said width decreases if the desired fibre length decreases. <IMAGE>

IPC 1-7 (main, further and additional classification)

D21B 1/30

IPC 8 full level (invention and additional information)

D21B 1/30 (2006.01)

CPC (invention and additional information)

B30B 9/121 (2013.01); B30B 9/16 (2013.01); B30B 11/246 (2013.01); D21B 1/30 (2013.01)

Citation (search report)

Designated contracting state (EPC)

AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

EPO simple patent family

EP 0979895 A1 20000216

INPADOC legal status


2001-07-04 [18D] DEEMED TO BE WITHDRAWN

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- Effective date: 20000817

2000-10-25 [AKX] PAYMENT OF DESIGNATION FEES

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2000-02-16 [AK] DESIGNATED CONTRACTING STATES:

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- Designated State(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

2000-02-16 [AX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT TO

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- Free Format Text: AL;LT;LV;MK;RO;SI