Sca Hygiene Products Ab

Metso Paper Karlstad Ab

Holger Hollmark

Lennart Reiner

Thomas Billgren

Bengt J&auml;rrehult

Kaveh Tondkar

Mats S&ouml;derberg

Ingvar B Klerelid

Hans Wallenius

Jeanette Annergren

Hans-J&uuml;rgen Lamb

Janerik Odhe

Ulrika Strandlund

A method of making a multilayer paper web, wherein at least two paper sheets are formed and dried separately to a dry content of no more than 80% by weight, imparting a three-dimensional pattern of alternating raised and recessed portions in the paper sheets during drying, combining the paper sheets into a multilayer web, in which void volumes are created between the raised and recessed portions of the combined sheets and drying the multilayer web.

Multi-layer paper web and a method of forming it

Method of producing a paper having a three-dimensional pattern of alternating raised and recessed portions which has been provided in connection with impulse drying, at which the wet paper web ( ) is passed through at least one press nip ( ) comprising a rotatable roll ( ) which is heated and that the paper web during the passage through the press nip is given a three-dimensional pattern of alternating raised and recessed portions either by means of a pattern wire, band or belt and/or by a pattern on the heated roll ( ) and where the paper web ( ) after said press nip ( ) is led around an essential part of the periphery of the heated roll ( ) in order to provide an additional drying of the paper web while this is still in contact with said three-dimensional pattern.

Method of producing a paper having a three-dimensional pattern

Device for producing a paper having a three dimensional pattern which has been given the paper web in connection with drying the paper web. The device comprises at least one press nip ( ) comprising a rotatable heated roll ( ) and a counter means ( ), at which either the heated roll ( ) along its periphery alternatively a member surrounding the roll or a patterned wire, band or belt is provided with said three dimensional pattern, and wherein the wet paper web ( ) is intended to pass through said press nip ( ) and is given said pattern A detaching roll (16) is arranged at a certain distance from the press nip ( ) for taking off the paper web from the heated roll ( ), and creping means ( ) are arranged for creping the paper from said detaching roll ( ).

Device for producing an extensible paper having a three-dimensional pattern

Method of producing paper having a three-dimensional pattern of alternating raised and recessed portions which is given the paper in connection with impulse drying, at which the wet paper web is passed through at least one press nip ( ) comprising a rotatable roll ( ) which is heated and that the paper web when passing through the press nip is given a three-dimensional pattern either by means of a pattern wire ( ) and/or by the fact that the heated roll ( ) is provided with a three-dimensional pattern, and where the wet paper web ( ) before entering said press nip ( ) is given a basis weight variation in a non-random pattern.

Absorbent wetlaid paper containing at least 1% by weight, calculated on the dry weight of the paper, of an absorbent polymeric material having a thermo-reversible liquid uptake capacity, which has a cloud point, Cp, in water within the temperature interval 30-60&deg; C., preferably 35-55&deg; C., at which the polymer has a substantially higher liquid uptake capacity at temperatures below said cloud point as compared to at temperatures above the cloud point. The thermo-reversible polymer will then be inactive during the papermaking process and be activated to its swelling and absorbent form when it is brought into contact with a liquid, the temperature of which is below the cloud point, Cp, of the polymer.

Absorbent paper and a method for production thereof

Method of producing an impulse dried paper having a three-dimensional pattern of alternating raised and recessed portions, which have been provided in connection with impulse drying, at which the wet paper web ( ) is passed through at least two press nips ( ), each comprising a rotatable heated roll ( ) which is heated and that the paper web during the passage through the press nips is given a three-dimensional pattern of alternating raised and recessed portions either by means of a patterned wire ( &prime;), -band or belt and/or by a pattern on the heated roll ( ).

Method of producing a paper having a three-dimensional pattern of alternating raised and recessed portions which is given the paper in connection with impulse drying. The paper web has a varying material composition as seen in its thickness direction, so that it at least in an outer layer contains an amount of a material that softens, melts or hardens in the temperature interval 100-400&deg; C. or in some other way contributes in stabilizing the pattern structure that has been given the paper. It is further referred to an impulse dried paper produced according to the method.

Method of producing a paper having a three-dimensional pattern and paper produced by the method

Method of producing a paper having a three-dimensional pattern of alternating raised and recessed portions, which has been provided in connection with impulse drying, at which the wet paper web ( ) is passed through at least one press nip ( ) comprising a rotatable roll ( ) which is heated and that the paper web during the passage through the press nip is given a three-dimensional pattern of alternating raised and recessed portions either by means of a patterned wire, band or belt and/or by a pattern on the heated roll ( ) and where said pattern is pressed into the paper web against a counter means ( ). The wet paper web before said press nip is exerted to a creping- or other compacting procedure which foreshortens the length of the paper web. The invention also refers to a paper produced by the method, said paper having a high extensibility.

Method of producing an extensible paper having a three-dimensional pattern and a paper produced by the method

A process for producing paper having a three-dimensional structure of alternating raised and recessed portions including passing a wet paper web through a heated press nip so the paper web is simultaneously dried by means of impulse drying and given a three dimensional structure. The heated press nip includes a heated pressure roll with a three dimensional pattern of alternating raised and recessed portions in its surface and a compressible surface. The compressible surface can be a compressible press felt which supports the wet paper web prior to and through the heated press nip. The compressible press felt may be pressed against a resilient compressible surface in the heated press nip away from the heated cylinder. The wet paper web may be a papermaking pulp containing at least 10%, and preferably at least 30% or 50% by weight of a high-yield pulp such as TMP or CTMP.

Growing community of inventors

Stockholm, Sweden

Holger Hollmark