Patent ID: 6447643
Filing Date: 2002-09-10
Classification: D21F

Abstract:
Method of producing a wetlaid fibrous web having a three-dimensional pattern of alternating raised and recessed portions by impulse drying comprising the steps of:passing the wet fibrous web through at least one press nip having a rotatable heated roll, the wet fibrous web being impulse dried during the passage through the press nip; imparting a three-dimensional pattern of alternating raised and recessed portions to the wet fibrous web using one of a patterned wire and a pattern on the heated roll, by pressing said pattern into the fibrous web against a counter means; and adding to the wet fibrous web a material that softens or melts in the temperature interval 100-400Â° C., at least a part of the wet fibrous web that is closest to the raised portions of the heated roll being heated to said temperature interval so that said material softens or melts to increase an amount of bonding points in the wet fibrous web.