D - Textiles – Paper – 21 – F
Patent
D - Textiles, Paper
21
F
34/38
D21F 3/00 (2006.01) D21F 3/02 (2006.01) D21F 5/00 (2006.01)
Patent
CA 1253685
APPLICANT: PER-ARNE WIBERG TITLE: A METHOD AND APPARATUS FOR DRYING A MOIST FIBRE WEB ABSTRACT OF THE DISCLOSURE A method for drying a moist fibre web, particularly a paper web, in which the moist fibre web, subsequent to having passed a wire a couch roll a pick-up felt and a suction press roll, is advanced to a press nip where the fibre web is transferred to a drying cylinder and remains on the cylinder until drying of the web is completed wherein the fibre web on the drying cylin- der is passed to a drying press, where a heated, permeable press means is pressed against the moist fibre web, whereupon moisture in the fibre web is transferred to the press means by the press pressure and the heat, this water pressed from the fibre web being subsequently extracted therefrom with the aid of suction boxes arranged on the inside of the press means. The press means comprises either a felt loop, including a pair of rolls - of which one roll is a press roll - a press felt of heat-durable fibres and suction boxes arranged on the inside of the press felt, wherein the press felt is heated upstream of the press nip with the drying cylinder by means of, for example, a gas burner wherein the burner gases are drawn by suction through the press felt with the aid of suction boxes, and wherein water pressed into the press felt is removed therefrom downstream of the press nip with the aid of suction boxes located on the inside of the felt. In a further embodi- ment, the press means also comprises a permeable, heat-durable metal band which is arranged in the press nip externally of the press felt and which is heated instead of heating directly the outer surface of the felt. In accordance with one advantageous embodiment, the felt loop of the press means is replaced with a permeable metal roll, optionally in combination with a permeable, heat-durable metal band externally of the roll surface in the press nip against the drying cylinder, wherein moisture pressed in the press nip from the fibre web into the heated roll cylinder is removed from the perforations of the roll surface downstream of the press nip with the aid of suction boxes arranged inwardly of the outer cylindrical wall of the roll. The invention also related to a drying arrangement exhibiting the afore-described characteristics of the embodiment incorporating a felt loop.
471848
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
Valmet Paper Machinery Inc.
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