Method for providing accelerated release of a blowing agent from

Plastic and nonmetallic article shaping or treating: processes – With severing – removing material from preform mechanically,... – Making hole or aperture in article

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264 51, 264 52, 264DIG5, 264DIG13, 264DIG15, 425 4C, 425290, 425817C, B29C 4400, B26F 124

Patent

active

055850588

ABSTRACT:
Disclosed is a method for providing accelerated release of a blowing agent from a solid, non-perforated plastic foam. The method relates (a) providing the solid, non-perforated plastic foam having the blowing agent and a permeability modifier therein and (b) perforating the foam at its surface to form a multiplicity of channels extending from the surface into the foam. The channels are in gaseous communication with the environment outside the foam and provide accelerated release of blowing agent.

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