CREPING PROCESS UTILIZING LOW TEMPERATURE-CURING ADHESIVE

• Main Authors: ROBERT EMIL WEBER, DUANE K. ZACHARIAS, KENNETH CURTIS LARSON, RALPH ANDERSON, THOMAS C. SAFFEL, CHRISTOPHER LEE DAVIDSON
• Format: Patent
• Language: English
• Published: 31.07.2003
• Subjects: IMPREGNATING OR COATING OF PAPER; MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNERANALOGOUS TO PAPER; MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD ORMATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; PAPER NOT OTHERWISE PROVIDED FOR; PAPER-MAKING; PERFORMING OPERATIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; PRODUCTION OF CELLULOSE; PULP COMPOSITIONS; TEXTILES; TRANSPORTING; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUSTO PAPER

A METHOD OF INCREASING THE WET STRENGTH OF A CREPED SHEET, WHICH METHOD INVOLVES PROVIDING A SHEET WHICH INCLUDES CELLULOSIC FIBERS, WHICH SHEET HAS A FIRST SIDE AND A SECOND SIDE; APPLYING A LOW TEMPERATURE-CURING LATEX ADHESIVE BINDER COMPOSITION TO THE FIRST SIDE OF THE SHEET IN A FINE, SPACED-APART PATTERN OCCUPYING FROM ABOUT 20 TO ABOUT 50 PERCENT OF THE SURFACE AREA OF THE SHEET; ADHERING THE FIRST SIDE OF THE SHEET TO CREPING SURFACE; AND CREPING THE SHEET FROM THE CREPING SURFACE. THE BINDER COMPOSITION IS ADAPTED TO ADHERE THE SHEET TO THE CREPING SURFACE AND INCLUDES A FUNTIONAL GROUP-CONTAINING LATEX, A FUNCTIONAL GROUP-REACTIVE CROSSLINKING AGENT, AND A VOLALITE BASE. IN ADDITION, THE CREAPING SURFACE IS HEATED FROM THE CREAPING SURFACE, WHICH IMPARTS TO THE CREPED SHEET A CROSS-DIRECTION WET TENSILE STERNGHT WHICH IS AT LEAST ABOUT 50 PERCENT THAT OF AN IDENTIFICAL CREPED SHEET WHICH HAS BEEN HEATED AT ABOUT 150 0C FOR THREE MINUTES, IN WHICH THE CROSS-DIRECTION WET TENSILE IS TESTED IN ACCORDANCE WITH TAPPI TEST METHODS T494OM-88 AND T456-87. IN ADDITION , THE CROSS-DIRECTION WET TENSILE STRENGHT OF THE CREPED SHEET IS AT LEAST ABOUT 40 GRAMS PER CENTIMETER.