Claims
- 1. Method of producing a paper having a three dimensional pattern of alternating raised and recessed portions by impulse drying, comprising the steps of:passing a wet paper web through at least one press nip having a rotatable heated roll; imparting a three dimensional pattern of alternating raised and recessed portions to the paper web during passage through the at least one press nip using at least one of a patterned wire, band or belt and a pattern on the heated roll, said imparting step pressing the three dimensional pattern into the paper web against a counter means; and withdrawing the paper web without creping so as to maintain the three dimensional pattern imparted in said imparting step, wherein after the press nip, the paper web is led around at least 180° of the periphery of the heated roll in order to provide an additional drying of the paper web while the paper web is still in contact with the heated roll.
- 2. Method as claimed in claim 1,wherein the paper web encloses at least 270° of the periphery of the heated roll.
- 3. Method as claimed in claim 1,further comprising an additional step of heating the paper web in an after-drying section.
- 4. Method as claimed in claim 1, characterized inthat the counter means (11, 14) is provided with a non-rigid surface so that the paper web is given a three dimensional structure having a total thickness greater than the thickness of the unpressed paper web.
- 5. Method as claimed in claim 4, characterized inthat the paper web is supported by a compressible press felt (11) through the press nip (12), said press felt makes said non-rigid counter means.
- 6. Method as claimed in claim 5, characterized inthat the press felt (11) is pressed against a resilient surface (14) in the press nip (12).
Priority Claims (1)
Number |
Date |
Country |
Kind |
9803362 |
Oct 1998 |
SE |
|
Parent Case Info
This is a continuation of co-pending international application No. PCT/SE99/01724 filed on Sep. 29, 1999, which designated the United States of America.
US Referenced Citations (10)
Foreign Referenced Citations (4)
Number |
Date |
Country |
0 490 655 |
Jun 1992 |
EP |
0796945 |
Sep 1997 |
EP |
9323613 |
Nov 1993 |
WO |
9716593 |
May 1997 |
WO |
Continuations (1)
|
Number |
Date |
Country |
Parent |
PCT/SE99/01724 |
Sep 1999 |
US |
Child |
09/822366 |
|
US |