Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Patent
1982-12-03
1985-07-16
Bell, James J.
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
139383A, 156148, 162DIG1, 428235, 428238, 428239, 428280, 428282, 428300, B32B 502
Patent
active
045296430
ABSTRACT:
A press felt for conveying a paper web through a press section of a paper machine and comprising a support fabric (1) formed of a yarn structure and a fibre bat layer (2) formed of fibres and needled to the support fabric at least on one side thereof. The support fabric and the fibre bat layer are filled with a filling material (3) from one surface of the felt to the other so that the felt has an air permeability of less than 0.5 m.sup.3 of air/m.sup.2 of felt per minute under an air pressure of 100 Pa. The fibre fineness of the fibre bat is preferably at least 6 den.
The felt formed by the fibre bat layer and the support fabric is preferably filled from the surface facing the paper with a rubber or resin emulsion so that the filled felt retains at least 45% of its original thickness under a compressive pressure of 10 MPa, in order to avoid blowing and rewetting at a conveying speed of up to 1000 m/min.
REFERENCES:
patent: 3059312 (1962-10-01), Jamieson
patent: 3252821 (1966-05-01), Christie et al.
patent: 3401467 (1968-09-01), Koester
patent: 4119753 (1978-10-01), Smart
patent: 4157752 (1979-06-01), Sick et al.
patent: 4162190 (1979-07-01), Ashworth
Bell James J.
Tamfelt Oy AB
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