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US 6,207,254 B1Granted
Partially perforated foam
AssigneeSealed Air Corporation
InventorsShau-Tarng Lee, Maurizio Brandolini
Life of this patent
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Abstract
A method for accelerating the release of a flammable blowing agent from an expanded foam is disclosed. According to the method, an expanded foam structure is perforated to form a first series of channels extending partially through its thickness from a first surface and a second series of channels extending partially through its thickness from a second surface opposite the first surface. The channels provide paths enabling the blowing agent to escape more rapidly from the interior of the expanded foam structure.
Claims7
An expanded foam structure, comprising
- a body including a polymer matrix and a blowing agent dispersed in a multiplicity of cells throughout said matrix, said body having first and second surfaces separated by a predetermined dimension;
- a first series of channels extending from said first surface toward said second surface, said first series of channels having a length of up to about 50 percent of said predetermined dimension;
- and
- a second series of channels extending from said second surface toward said first surface, said second series of channels having a length of up to about 50 percent of said predetermined dimension.
1 more element
Dependencies are inferred from the claim text.