Method for forming webs of transversely extensible fibrous material, in particular paper webs, and apparatus for implementing the method

• Main Authors: STERNER MARION, TRANI GIORGIO
• Format: Patent
• Language: Chinese; English
• Published: 16.01.2013
• Subjects: 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; PERFORMING OPERATIONS; TRANSPORTING; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUSTO PAPER

A method for forming a web of transversely extensible fibrous material, characterised by subjecting a fluid-permeable endless conveyor belt (2, 2') of elastic material, of thickness increasing from its longitudinal axis to its edges, to at least one localized transverse stretching operation, achieved by temporarily withdrawing at least one longitudinal band thereof from the surface on which it naturally slides and maintaining it in contact, in this stretched condition, with at least a part of the surface of at least one support member (4, 4', 10); depositing a web (16) of pliable fibrous material having a liquid content between 3% and 70% by weight against that portion of said conveyor belt (2, 2') of elastic material which has been transversely stretched; and by the effect of vacuum, maintaining said web (16) of pliable fibrous material adhering to said conveyor belt (2, 2') of elastic material during its return to its original configuration, to cause the transverse contraction of said web (16) and the simul