D - Textiles – Paper – 21 – F
Patent
D - Textiles, Paper
21
F
D21F 2/00 (2006.01) D21G 9/00 (2006.01)
Patent
CA 2122350
A pick-up roll apparatus (10) is disclosed for picking up a tail (T) of a web (W) from a forming wire (12) and for transferring the tail (T) to a press felt (14) wrapping around a portion (16) of the apparatus. The apparatus includes a perforate rotatable shell (18) which is disposed adjacent to the forming wire (12), the shell (18) having a first and a second end (20, 22). A stationary core (24) is disposed within the shell (18), the core (24) defining a tail box (26) which is bounded by the shell (18). The tail box (26) is disposed adjacent to one of the ends (20, 22) of the shell (18) and is selectively connected to a source of partial vacuum (52) such that when the tail (T) of the web (W) is cut on the forming wire (12), the tail (T) is drawn from the forming wire (12) onto the press felt (14) which wraps around the rotatable shell (18). The core (24) alsodefines a downstream chamber (27) which extends between the first end and the second end (20, 22) of the shell (18). The chamber (27) is bounded by the shell (18) and is connected to the source of vacuum (28) such that during wid- ening of the tail (T) to a full-width sheet (FNS), a flow of air through the press felt (14) and through the perforate shell (18) towards the downstream chamber (27) urges the widened tail (T) towards the press felt (14). The tail box (26) and the downstream chamber (27) are in fluid communication with each other so that any tendency of the tail (T) to detach from the press felt (14) in the vicinity of the tail box (26) during the widening of the tail (T) is inhibited.
Metso Paper Inc.
Ridout & Maybee Llp
LandOfFree
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