Pick-up roll apparatus

Details Pick-up roll apparatus Pick-up roll apparatus

1992-04-20

1994-01-25

Hastings, Karen M.

Paper making and fiber liberation

Apparatus

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

162193, 162370, D21F 310

Patent

active

052813088

ABSTRACT:
A pick-up roll apparatus is disclosed for picking up a tail of a web from a forming wire and for transferring the tail to a press felt wrapping around a portion of the apparatus. The apparatus includes a perforate rotatable shell which is disposed adjacent to the forming wire, the shell having a first and a second end. A stationary core is disposed within the shell, the core defining a tail box which is bounded by the shell. The tail box is disposed adjacent to one of the ends of the shell and is selectively connected to a source of partial vacuum such that when the tail of the web is cut on the forming wire, the tail is drawn from the forming wire onto the press felt which wraps around the rotatable shell. The core also defines a downstream chamber which extends between the first end and the second end of the shell. The chamber is bounded by the shell and is connected to the source of vacuum such that during widening of the tail to a full-width sheet, a flow of air through the press felt and through the perforate shell towards the downstream chamber urges the widened tail towards the press felt. The tail box and the downstream chamber are in fluid communication with each other so that any tendency of the tail to detach from the press felt in the vicinity of the tail box during the widening of the tail is inhibited.

REFERENCES:
patent: 2714342 (1955-08-01), Beachler
patent: 2857822 (1958-10-01), Heys
patent: 4980979 (1991-01-01), Wedel
patent: 5015336 (1991-04-01), Roerig et al.
patent: 5135614 (1992-08-01), Aula et al.

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