Roll cover, roll, and use of said roll
AssigneeVoith Patent GmbH
InventorsFranz Grohmann, Anton Horak, Nina Eggers, Stefan Pollaschek
Life of this patent
Estimating the term…
Abstract
A roll covering includes a functional layer formed of a polymer which is a blend of at least one rubber and one millable polyurethane rubber. The polymer includes from 65% by weight to 85% by weight of the at least one rubber and from 15% by weight to 35% by weight of the millable polyurethane rubber. A roll having the roll core, a method of using the roll and a combination of the roll and a heated drying cylinder are also provided.
Claims14
A roll covering, comprising:
- a functional layer formed of a polymer being a blend of at least one rubber and one millable polyurethane rubber;
- said millable polyurethane rubber having characteristics of having been produced by a reaction of a polyol with a diisocyanate and a crosslinking agent;
- and
- said polymer including from 65% by weight to 85% by weight of said at least one rubber and from 15% by weight to 35% by weight of said millable polyurethane rubber.
A roll covering, comprising:
- a functional layer formed of a polymer being a blend of at least one rubber and one millable polyurethane rubber;
- said at least one rubber being a crosslinked nitrile rubber (NBR), a crosslinked hydrogenated nitrile rubber (HNBR) or a mixture of said crosslinked rubbers;
- said polymer including from 65% by weight to 85% by weight of said at least one rubber and from 15% by weight to 35% by weight of said millable polyurethane rubber;
- and
- a mixture having a proportion of said crosslinked hydrogenated nitrile rubber (HNBR) relative to said crosslinked nitrile rubber (NBR) not exceeding 50% by weight.
A method of using a roll in a machine for manufacturing paper, paperboard or tissue, the method comprising the following steps:
- providing a roll including a roll core and, formed on the roll core, a roll covering having a functional layer produced from a polymer being a blend of at least one rubber and one millable polyurethane rubber, the millable polyurethane rubber having characteristics of having been produced by a reaction of a polyol with a diisocyanate and a crosslinking agent, and the polymer including from 65% by weight to 85% by weight of the at least one rubber and from 15% by weight to 35% by weight of the millable polyurethane rubber;
- and
- using the roll for surface finishing, drainage, sizing, coating or pigmentation of a fiber web including a paper web, a paperboard web or a tissue web.
A combination, comprising:
- a roll including a roll core and, formed on said roll core, a roll covering having a functional layer formed of a polymer being a blend of at least one rubber and one millable polyurethane rubber, said polymer including from 65% by weight to 85% by weight of said at least one rubber and from 15% by weight to 35% by weight of said millable polyurethane rubber;
- and
- a heatable or heated drying cylinder;
- said roll and said drying cylinder being at least indirectly in contact with one another and together delimiting a press nip.
Dependencies are inferred from the claim text.