High speed size press
AssigneeBeloit Corporation
InventorEdgar J. Justus
Life of this patent
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Abstract
A method and apparatus for high speed application of sizing compositions in which there is a pair of oppositely rotating rolls forming a coating nip therebetween through which a paper web to be sized is directed. Sizing composition is delivered to the nip in sufficient quantity to form a pond of sizing composition above the nip. The invention is particularly concerned with reducing the effects of translational energy which is transmitted into the pond from the rolls by providing at least one flexible baffle member which extends into the pond on opposite sides of the paper web into proximity with the nip. The baffle member should be sufficiently long to absorb translational energy which would otherwise be absorbed by the pond of sizing material.
Claims10
A size press assembly comprising:
- a pair of oppositely rotating rolls forming a coating nip therebetween,
- means for directing a paper web through said nip,
- means for delivering a sizing composition to said nip in sufficient quantity to form a pond of sizing composition above said nip, and
- at least one flexible baffle member extending into said pond on opposite sides of said paper web into proximity with said nip, each baffle being located between said web and the periphery of its associated roll, said baffle members being sufficiently long to shield the pond from translational energy from the roll surfaces which would otherwise be absorbed by the pond above said nip.
A method for applying a sizing composition to a paper web which comprises:
- passing said web into the nip between a pair of counter-rotating rolls,
- delivering a liquid sizing composition between the rolls and the web passing therebetween to thereby form a pond of sizing composition on each side of the traveling paper web, and
- immersing a flexible baffle element into each pond between said web and the roll which applies sizing composition to the side of said web facing said roll to a distance sufficient to reduce substantially the violent turbulence in said pond.
Dependencies are inferred from the claim text.