Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – By gas forming or expanding
Reexamination Certificate
2006-05-30
2006-05-30
Kuhns, Allan R. (Department: 1732)
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
By gas forming or expanding
C264S051000, C264S055000, C264S154000, C264S155000, C264S156000, C264S157000, C264SDIG050
Reexamination Certificate
active
07052634
ABSTRACT:
A method for making a foam sheet having ventilation holes includes the steps of: (a) preparing first and second molds, each including lower and upper mold parts separably closed to each other so as to define first and second mold cavities for the first and second molds, respectively, and providing the second mold with a plurality of pins extending into the second mold cavity, the second mold cavity being larger than the first mold cavity; (b) placing a foamable blank into the first mold cavity; (c) foaming the blank in the first mold cavity; (d) placing the blank foamed in step (c) into the second mold cavity, and piercing the blank through the use of the pins; and (e) foaming the blank to form a foam product within the second mold cavity while being pierced by the pins.
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patent: 5451356 (1995-09-01), Hebert
patent: 6103163 (2000-08-01), Joppen et al.
patent: 6439536 (2002-08-01), Piccolo
patent: 6533880 (2003-03-01), van Manen
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