Coater startup
AssigneeMacMillan Bloedel Limited
InventorsDavid R. Elvidge, Malcolm K. Smith
Life of this patent
Estimating the term…
Abstract
Lubricant is applied to the rolls of the size press to lubricate the rolls prior to moving the coating heads into their coating position by substantially simultaneously applying a lubricating film to each of the rolls of the size press in stripes symmetrically positioned relative to the center line of the web passing through the size press to in stages symmetrically relative to the axis of the web substantially equally increase the surface area of the roll to which the lubricating film is applied until the full surface corresponding to the full width of the web on each of the rolls is lubricated and then a metering rod type coating head apply coating to each of the size press rolls are simultaneously moved into coating position.
Claims12
A method of lubricating a surface of at least one size press roll comprising passing a paper web through a coater nip formed by said at least one size press roll, applying a lubricating liquid to a peripheral surface on said at least one size press roll along areas symmetrically located on opposite sides of an axial center line of said paper web passing through said nip to form on said peripheral surface of said at least one roll film lubricated areas symmetrically located on opposite sides of said axial center line, over time and symmetrically on opposite sides of said axial center line increasing the total width measured axially of said at least one roll of said lubricated areas until said lubricated areas extend axially of said at least one size press roll a width at least equal to an effective axial length of a coating head for application of a coating to said at least one roll, and then moving said coating head into coating positions against said at least one roll.
Dependencies are inferred from the claim text.