Closed shoe press head indexing system

Details Closed shoe press head indexing system Closed shoe press head indexing system

1998-01-09

1999-05-04

Hastings, Karen M.

Paper making and fiber liberation

Processes and products

Conditioning, preparing or repairing of apparatus

162205, 162272, D21F 308

Patent

active

059001186

ABSTRACT:
A blanket passes over a concave shoe which is urged against a backing roll to form a press nip. The ends of the blanket are attached to circular heads. The transition from the nip-imposed cardioid shaped to the circular shape maintained by the heads results in a region of the blanket subject to fatigue. The heads are mounted on journals for motion between inboard stops and outboard stops which are spaced apart approximately 4 inches in the cross machine direction. Positioning of the heads on the journals is controlled by four hydraulic pistons mounted between the support beam and each head. Multiple hydraulic systems are controlled to extend the life of the blanket by alternating between holding the back head fixed and letting the front head float and fixing the front head and letting the back head float.

REFERENCES:
patent: 5084137 (1992-01-01), Ilmarinen et al.
patent: 5643416 (1997-07-01), Lange et al.

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