Method and apparatus for forming a web

Details Method and apparatus for forming a web Method and apparatus for forming a web

1986-05-06

1987-05-05

Rimrodt, Louis K.

Textiles: fiber preparation

Assembling

Web forming

19304, D04H 100, D01G 2500

Patent

active

046620320

ABSTRACT:
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 depositing the material on the upper surface of an air permeable 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, comparing 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 grammage profile. An apparatus for accomplishing each of the steps of the method is also provided.

REFERENCES:
patent: 2715755 (1955-08-01), Jones
patent: 2940135 (1960-06-01), Heritage
patent: 3032836 (1962-05-01), Anderberg et al.
patent: 3071822 (1963-01-01), Meiler
patent: 3744092 (1973-07-01), Auten
patent: 3792943 (1974-02-01), Helgesson
patent: 4099296 (1978-07-01), Gustavsson

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