| (19) |
 |
|
(11) |
EP 0 241 054 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
23.08.1989 Bulletin 1989/34 |
| (43) |
Date of publication A2: |
|
14.10.1987 Bulletin 1987/42 |
| (22) |
Date of filing: 23.02.1987 |
|
|
| (84) |
Designated Contracting States: |
|
AT BE CH DE ES FR GB GR LI LU NL SE |
| (30) |
Priority: |
07.03.1986 IT 1966886
|
| (71) |
Applicant: ENICHEM FIBRE S.p.A. |
|
I-90139 Palermo (IT) |
|
| (72) |
Inventors: |
|
- Cognigni, Franco
I-20097 San Donato Milanese
Milan (IT)
- Sciolla, Ettore
I-09025 Oristano (IT)
|
| (74) |
Representative: Roggero, Sergio (IT) et al |
|
Ing. Barzanò & Zanardo S.p.A.
Via Borgonuovo 10
I-20121 Milano
I-20121 Milano (IT) |
|
| |
|
| (54) |
Improvements in methods for producing in-line dyed acrylic fibres |
(57) In the preparation of in-line dyed acrylic fibres by the wet-spinning process in
which a solution of an acrylonitrile polymer in an organic solvent is extruded into
a coagulum bath and the coagulated fibre is subjected to stretching and dyeing, a
retraction step conducted under particular conditions is interposed between the stretching
step and dyeing step, in order to improve the fibre dyeing characteristics.