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US 4,668,536 AGranted
Method and apparatus for coating corrugated board
AssigneeEagle-Picher Industries, Inc.
InventorsEston B. Goodell, Bruce L. Dinda
Life of this patent
Estimating the term…
Abstract
Apparatus for applying a coating of paraffin wax to sheets of corrugated paperboard. The sheets are fed in a generally horizontal attitude through a bath of molten wax disposed in an elongated tank. Chain belt conveyors provide upper and lower flights to hold the sheets as they are passed through the bath.
Claims10
Apparatus for applying a coating of wax to sheets of corrugated paperboard, each having two sheets of paper sandwiching a flute creating corrugated sheet therebetween comprising:
- a tank,
- means for supplying wax to said tank,
- means for heating said wax,
- means for conveying said sheets, lying in substantially horizontal planes, through said tank in the direction of said flutes,
- means at the discharge end of said tank for draining said sheets, and means at the discharge end of said draining means for carrying said sheets in a vertical attitude away from said draining means to freeze said wax.
2 more elements
The method of coating corrugated paperboard with wax comprising the steps of:
- heating to a melted condition a bath of paraffin wax,
- conveying sheets of corrugated board in a horizontal attitude through said wax in the direction of the flutes of the board,
- conveying said sheets from said bath in an inverted U-shaped path,
- blowing excess wax from said board,
- returning said excess wax to said bath,
- and chilling the wax on said sheets.
3 more elements
Dependencies are inferred from the claim text.