Procedure and apparatus in dry forming of fibre layer

Details Procedure and apparatus in dry forming of fibre layer Procedure and apparatus in dry forming of fibre layer

2011-05-24

2011-05-24

Halpern, Mark (Department: 1741)

Plastic and nonmetallic article shaping or treating: processes

Forming articles by uniting randomly associated particles

Projecting particles in a moving gas stream

C264S131000, C264S518000, C162S289000, C156S062200

Reexamination Certificate

active

07947203

ABSTRACT:
The invention relates to a procedure and an apparatus in dry formation of a fibre layer, in which procedure fibre-containing air is passed through a forming wire (7) moving via a former (2) or an equivalent distributor unit and further through a suction box (8) or equivalent placed below the forming wire, and which air is circulated back to the upper part of the same or another former. In the solution of the invention, the air circulated through the suction box (8) is passed to the upper part of the former via channels (17) with an adjustable flow rate.

REFERENCES:
patent: 3748693 (1973-07-01), Jespersen
patent: 4761858 (1988-08-01), Maijala
patent: 5269049 (1993-12-01), Gustafsson et al.
patent: 2003/0010683 (2003-01-01), Christensen
patent: 2003/0066168 (2003-04-01), Schneider
patent: 362 4470 (1987-02-01), None
patent: 0 536 904 (1993-04-01), None

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