Method of forming perforations in a structure during molding the

Details Method of forming perforations in a structure during molding the Method of forming perforations in a structure during molding the

1994-03-24

1995-09-19

Woo, Jay H.

Plastic and nonmetallic article shaping or treating: processes

With severing, removing material from preform mechanically,...

Simultaneous severing and shaping, or severing while work...

264321, 264322, 425 4C, 425292, 425817C, B29C 5132

Patent

active

054513561

ABSTRACT:
A thermoforming technique for making a shaped article from a web of polystryrene foam sheet or the like, with simultaneous forming and perforation of the article. Serrated cutter and spaced mandrel elements mounted in opposing mold sections provide a perforated pattern in the sheet.

REFERENCES:
patent: 3360420 (1967-12-01), Paul et al.
patent: 3475526 (1969-10-01), Seto
patent: 3518334 (1970-06-01), Carrigan et al.
patent: 4304747 (1981-12-01), Lake
patent: 4477243 (1984-10-01), Wallsten

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