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US 5,487,780 AGranted
Apparatus for applying coating materials to overlapped individual sheets
AssigneeMinnesota Mining and Manufacturing Company
InventorJohannes A. Ritter
Life of this patent
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Abstract
A method and apparatus for applying pressure sensitive adhesive to a substrate, in which the adhesive is deposited on a transfer surface, such as a circulating transfer belt, dried, and subsequently transferred to a plurality of overlapping sheets. The sheets are preferably coated with a primer or a low adhesion backsize, or both, prior to application of the adhesive.
Claims18
An apparatus for applying a coating material to a plurality of sheets as the sheets are conveyed past the apparatus, comprising:
- (a) means for overlapping a plurality of sheets, such that a first minor portion of each sheet overlies a portion of a first adjacent sheet, and a second minor portion of each sheet underlies a portion of a second adjacent sheet wherein the first and second portions of each sheet are opposed portions of the sheet;
- (b) a first coating station for applying a primer layer to a first major surface of each sheet, and a low adhesion backsize to a second major surface of each sheet;
- (c) a second coating station comprising (i) means for receiving coating material from a supply of such material, (ii) means for at least partially drying the coating material on the receiving means and (iii) means for transferring the coating material from the receiving means to at least a portion of the primer coated first major surface of the overlapped sheets as the sheets are conveyed past the coating station to form coated sheets;
- and
- (d) means for collecting the coated sheets.
2 more elements
An apparatus comprising:
- (a) a sheet dispensing station effective for dispensing a plurality of sheets in an overlapping configuration such that a first longitudinal end of each sheet overlies a portion of a first adjacent sheet and a second longitudinal end of each sheet underlies a portion of a second adjacent sheet so as to form a longitudinally continuous array of overlapped sheets;
- (b) a first coating station for applying a primer layer to a first major surface of each sheet, and a low adhesion backsize to a second major surface of each sheet;
- and
- (c) a second coating station effective for continuously applying an at least partially dried coating material to at least a portion of the first major surface of the overlapped sheets as the sheets move through the second coating station.
1 more element
Dependencies are inferred from the claim text.