Deflection-controlled roll for the pressure treatment of materials in web form
AssigneeEscher Wyss Limited
InventorRolf Lehmann
Life of this patent
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Abstract
The deflection-controlled roll has a roll shell rotatable about a fixed beam with a plurality of hydraulic piston support devices along the roll for exerting support forces between the beam and the roll shell. The roll shell has weakened zones along its length for reducing the stiffness of the shell. The weakened zones may comprise grooves, circumferential rows of bores or tangential slots, corrugated annular inserts, etc. The weakened zones may be formed between annular portions of the roll shell aligned with the operating surfaces of the support devices. Preferably the support devices form hydrostatic support fluid layers between the operating surfaces and the roll shell. Lift-off support devices may be employed.
Claims11
A deflection-controlled roll for the pressure treatment of materials in web form comprising a fixed beam, a continuous cylindrical roll shell rotatable about the beam, an elastomeric covering on the roll shell and a plurality of hydraulic piston support devices positioned along the length of the roll for exerting support forces between the beam and the roll shell at respective operating surfaces of the devices, said roll shell having annular portions with smooth inner surfaces aligned with and forming runways for said operating surfaces of said support devices and circumferential zones spaced along the length thereof between said annular portions of greater flexibility than said annular portions for reducing the stiffness of the shell to lateral forces imposed thereon during operation.
Dependencies are inferred from the claim text.