D - Textiles – Paper – 04 – H
Patent
D - Textiles, Paper
04
H
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D04H 1/72 (2006.01) B27N 3/14 (2006.01) D01G 25/00 (2006.01) D04H 1/00 (2006.01) D21F 1/00 (2006.01) D21F 1/08 (2006.01) A24C 5/18 (2006.01) A24C 5/34 (2006.01) B27N 3/04 (2006.01)
Patent
CA 1255870
METHOD AND APPARATUS FOR FORMING A WEB Abstract of the Disclosure A method and apparatus for forming a web having a predetermined grammage profile in its transverse direction is provided. The method includes the steps of introducing a composite flow of particulate material suspended in air into the distribution chamber of a forming head and depo- siting the material on the upper surface of an air per- meable belt while applying suction to form a web and while the grammage profile is controlled by measuring the profile of the web downstream of the distribution chamber, com- paring the measurement with predetermined set points, generating a control signal representative of any detected difference and controlling the amount of suction applied in predetermined suction sections in response to the control signal so as to provide a web having a predetermined gram- mage profile. An apparatus for accomplishing each of the steps of the method is also provided.
508459
Gowling Lafleur Henderson Llp
Sunds Defibrator Ab
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