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US 4,540,455 AGranted
Method of manufacturing laminated foam plastics materials
OwnerWilliam D. Brewerinventor
Life of this patent
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Abstract
A method of manufacturing laminated plastics materials comprising passing a first sheet material adjacent a barrier in parallel spaced relation to the barrier which is disposed obliquely to the direction of passage of the first sheet material and applying a quantity of unfoamed polyurethane prepolymer at or adjacent the edge of the first sheet upstream of the most upstream part of the barrier. A second sheet material may be applied to the foam as it passes under the barrier.
Claims10
A method of manufacture of laminated material, comprising the steps of:
- arranging a barrier in spaced relation to a first sheet material,
- applying a quantity of unfoamed prepolymer onto said first sheet material adjacent an edge of the material,
- causing the first sheet and prepolymer to pass adjacent said barrier,
- allowing the prepolymer to foam as it passes adjacent the barrier, and
- allowing the foam to cure to form a laminated material,
- wherein the barrier is disposed obliquely to the direction of passage of said first sheet material,
- and wherein the said quantity of the prepolymer is applied onto said first sheet material upstream of the most upstream part of the barrier.
4 more elements
Dependencies are inferred from the claim text.