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US 5,478,619 AGranted
Web takeup roll
AssigneeFuji Photo Film Co., Ltd.
InventorsDaisuke Fujikura, Takashi Nawano
Life of this patent
Estimating the term…
Abstract
A web takeup roll includes a web takeup core and a shape-memory resin layer provided on an outer circumference of the web takeup core. In the present web takeup roll, a modulus of elasticity of the shape-memory resin layer changes with temperature.
Claims3
A web takeup roll around which a web is adapted to be wound comprising:
- web takeup core;
- and
- a shape-memory resin layer, provided around said core, for allowing a leading end of said web initially contacting said memory means to form an indentation therein in which said leading end is received so that successive rotations of said web are not deformed by said end, said resin layer having the property of transitioning between a rubber region in which said indentation is formed and a glass region in which said indentation becomes fixed in response to a change in temperature.
A method of winding a web on a takeup roll, comprising the steps of:
- applying a shape-memory resin layer to a surface of the roll;
- heating the surface of the roll above a rubber transition temperature of the resin but below a fixing phase freezing point such that said resin assumes a natural shape thereof;
- winding the web around the roll such that a portion of said resin is deformed to receive an end of said web;
- and
- cooling the surface of the roll below the rubber transition temperature of the resin during or after the winding of the web around said roll such that said resin retains said deformed shape.
2 more elements
Dependencies are inferred from the claim text.