Multi-layer headbox with plastic and metal divider plate

Details Multi-layer headbox with plastic and metal divider plate Multi-layer headbox with plastic and metal divider plate

1997-02-27

1998-12-15

Hastings, Karen M.

Paper making and fiber liberation

Apparatus

Running or indefinite length product forming and/or treating...

162258, 162259, 162347, D21F 102

Patent

active

058491597

ABSTRACT:
A multi-layer headbox for the production of a multi-layer web of paper has, for instance, three flow planes (I, II, III), each having a pulp feed device (1.1, 1.2, 1.3). In each flow plane a turbulence generator (3) is provided which opens into a nozzle (4). In it there are two plates (5.1, 5.2) which keep two neighboring streams of slurry separate from each other up to the region of the exit slot (8). Each plate is developed as a flexurally soft plate of plastic, the downstream end of which is metal and has a thickness S of at most 0.3 mm. The plastic and metal have a different in coefficients of thermal expansion of <10.sup.-7 1/K.

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