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US 4,056,422 AGranted
Two stage oven laminator method
AssigneeGeneral Binding Corporation
InventorHenry N. Staats
Life of this patent
Estimating the term…
Abstract
A two-state oven type laminating apparatus including two heater systems operating at different temperatures whereby conventional polyester-polyethylene combinations may be laminated relatively bubble-free and without distortion of the polyester.
Claims5
The method of laminating a polyester-heat sealable adhesive film material to paper or card stock to form a laminated product comprising:
- inserting the product to be laminated into a carrier,
- passing the carrier and its contents through a first heating zone having a temperature range sufficiently high to melt the adhesive to provide a preliminary superficial tack without distorting the polyester.
- passing the heated carrier and product through a pair of pressure laminating rolls,
- then passing the carrier and its contents through a second heating zone having a temperaure range higher than the temperature range in said first heating zone to further melt the adhesive and then passing the carrier and product through a second pair of laminating rolls to effect lamination of the adhesive to the card stock without polyester distortion
1 more element
A method of making laminated articles comprising the steps of:
- providing a carrier containing a product to be laminated between a pair of films each comprising a heat-sealable plastic material previously laminated to a polyester film, feeding said carrier an said product, into a first heating zone to heat said product to a predetermined temperature to melt said heat-sealable plastic material to provide a preliminary superficial tack to said product;
- passing said carrier and product through a first pair of laminating rolls;
- heating said product after it leaves said first pair of rolls in a second heating zone to a higher temperature than in said first heating zone to provide a further melting of said heat-sealable plastic material, and
- feeding the product containing carrier through a second pair of laminating rolls to complete the laminating operation.
1 more element
Dependencies are inferred from the claim text.