Claims
- 1. An embossing belt for a paper machine, intended to run through a press section in the paper machine together with a fibrous web and produce embossment thereof in the press section, and to transfer the embossed fibrous web from the press section directly to and through a transfer means in the dryer section of the paper machine, characterised in thatit is essentially impermeable and comprises a rear layer (33) and a web-contacting layer (34), which has a large number of uniformly distributed depressions (35) and, positioned therebetween, surface portions (36) for forming a corresponding relief pattern in the fibrous web passing through the press section, that said rear layer (33) is a carrier and that said web-contacting layer (34) is a compressible polymer layer having a hardness of between 50 and 97 Shore A, said polymer layer having a web-contacting surface which has a pressure-sensitive, resettable degree of roughness, the web-contacting surface having a degree of roughness in a non-compressed state of Rz=2-80μm, and a lower degree of roughness of Rz=0-20μm when the polymer layer is compressed by a linear load of 20-220 kN/m applied to the essentially impermeable embossing belt as measured in a non-extended press nip.
- 2. An embossing belt for a paper machine, intended to run through a press section in the paper machine together with a fibrous web and produce embossment thereof in the press section, and to transfer the embossed fibrous web from the press section directly to and through a transfer means in the dryer section of the paper machine, characterised in thatit is essentially impermeable and comprises a rear layer (33) and a web-contacting layer (34), which has a large number of uniformly distributed depressions (35) and, positioned therebetween, surface portions (36) for forming a corresponding relief pattern in the fibrous web passing through the press section, that said rear layer (33) is an essentially impermeable layer and that said web-contacting layer (34) is a fabric which is coated with a polymer without concealing the geometric structure of the fabric, said structure being formed of said depressions (35) and, positioned therebetween, surface portions (36) which have curved or convex shapes.
- 3. An embossing belt as claimed in claim 2, characterised in that said curved or convex surface portions (36) comprise a plurality of knuckles (36b), which are formed of fabric threads extending in one and the same direction, and are uniformly distributed in a number of 25-150 knuckles/cm2.
- 4. An embossing belt as claimed in claim 1, characterised in that the depressions (35) receive from 30% up to 70% of the web-contacting surface.
- 5. An embossing belt as claimed in claim 1, characterised in that the depressions (35) consist of continuous grooves in the polymer layer (34), said grooves (35) being arranged in one or more groups, the grooves in one and the same group extending in the same direction.
- 6. An embossing belt as claimed in claim 5, characterised in that the distance (a) between two grooves (35) in the same group is in the range of 1-3 mm, and that the width (b) of the groove is in the range of 0.5-1.0 mm and the depth (c) in the range of 0.1-1.0 mm.
- 7. An embossing belt as claimed in claim 5, characterised in that the grooves (35) extend in the machine direction or make an angle therewith of 10-80°.
- 8. An embossing belt as claimed in claim 5, characterised in that the grooves (35) are arranged in a first group, in which the grooves extend in one and the same direction, and a second group in which the grooves extend in one and the same direction, which makes an angle α with the direction of the grooves in the first group, said angle α being 10-170°.
- 9. An embossing belt as claimed in claim 5, characterised in that the grooves (35) are straight.
- 10. An embossing belt as claimed in claim 1, characterised in that the depressions (35) consist of cavities of the same or different geometric shapes comprising a circle, ellipse, polygonal, each having a greatest dimension in the range of 0.5-3.0 mm and a depth in the range of 0.5-1.0 mm.
- 11. An embossing belt as claimed in claim 1, characterised in that at least some of the depressions (35) consist of cavities of non-geometric symbolic shapes and comprising figures, letters or product or firm symbols with a depth in the range of 0.5-1.0 mm.
- 12. An embossing belt as claimed in claim 1, characterised in that the essentially impermeable embossing belt (16) has an air permeability of less than 6m3/m2 /min.
- 13. An embossing belt as claimed in claim 1, characterised in that the transfer means consists of the essentially impermeable embossing belt (16), which runs round a predetermined part of a dryer cylinder (5) in the dryer section to form an extended transfer nip.
- 14. An embossing belt as claimed in claim 3, wherein said plurality of knuckles (36b), are uniformly distributed in a number of 50-100 knuckles/cm2.
- 15. An embossing belt as claimed in claim 5, characterised in that the grooves (35) are undulated.
Priority Claims (1)
Number |
Date |
Country |
Kind |
9800947 |
Mar 1998 |
SE |
|
CROSS REFERENCE TO RELATED APPLICATION
This is a continuation of International Application No. PCT/SE99/00435, which was filed on Mar. 19, 1999 and in which the United States was designated.
US Referenced Citations (24)
Foreign Referenced Citations (4)
Number |
Date |
Country |
1188556 |
Jun 1985 |
CA |
195 48 747 |
Jul 1997 |
DE |
9800949-1 |
Mar 1998 |
SE |
WO9116493 |
Oct 1991 |
WO |
Continuations (1)
|
Number |
Date |
Country |
Parent |
PCT/SE99/00435 |
Mar 1999 |
US |
Child |
09/665632 |
|
US |