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US 5,084,324 AGranted
Micro-bubble laminate with perforated substrate
AssigneeW. R. Grace & Co.-Conn.
InventorHenry G. Schirmer
Life of this patent
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Abstract
A micro-bubble laminate is made by drawing a heated thermoplastic film through the perforations of a perforated substrate laminated to the film. The bubbles may then be trapped by laminating an additional thermoplastic layer to the laminate construction. This laminate may be used in producing air cushioning or bubble laminates, and the inventive process avoids the intricate and expensive machinery typically used in the production of air cushioning materials.
Claims14
A micro-bubble laminate comprising:
- a) a perforated substrate comprising a metallic or thermoplastic web;
- b) a first thermoplastic film adhered to the perforated substrate, and formed by drawing while heated through the perforations of the perforated substrate into gas bubbles protruding up through the perforations of the perforated substrate;
- and
- c) a second thermoplastic film adhered to the surface of the first thermoplastic film opposite the perforated substrate.
1 more element
Dependencies are inferred from the claim text.