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US 6,183,603 B2Granted
Calendering system using hard and soft nips
AssigneeWestvaco Corporation
InventorsStephen Nicholson, Steven Herman Parker, Domenick Larry Raschella, Sharon Rae Stampfl
Life of this patent
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Abstract
This invention relates to calendering systems. Such structures of this type, generally, employ the use of hard and soft nips to provide excellent smoothness without gloss mottle.
Claims5
An apparatus for producing a substantially gloss mottle-free calendered paper with significantly improved smoothness by calendering a coated paper, wherein said apparatus is comprised of:
- a single, harder calendering roll;
- a heated roll means located substantially adjacent to said single, harder calendering roll;
- a first nip located between said single, harder roll and said heated roll;
- a single, softer calendering roll located substantially adjacent to said heated roll means;
- and
- a second nip located between said single, softer roll and said heated roll, wherein said single, harder calendering roll has a Shore D surface hardness rating of greater than 80 and said softer calendering roll has a Shore D surface hardness rating of less than or equal to 80 such that paper to be calendered contacts said first nip and then said second nip.
3 more elements
Dependencies are inferred from the claim text.