Method of producing shaped plastic foam parts

Details Method of producing shaped plastic foam parts Method of producing shaped plastic foam parts

1998-12-09

2000-03-28

Kuhns, Allan R.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264122, 2642711, 264278, 264321, 264 467, 264916, B29C 4404, B29C 4406, B29C 4412

Patent

active

060427647

ABSTRACT:
A method of producing a three-dimensional shaped plastic foam part comprises the steps of mixing plastic foam granules of a predetermined range of sizes and of different hardness in a predetermined mixing ratio to obtain a mixture of the plastic foam granules, mixing the mixture of the plastic foam granules with a liquid primary material until the granules are coated with the liquid primary material and a mixture of coated plastic foam granules is obtained, feeding a preset quantity of the mixture of coated plastic foam granules into a mold cavity of a mold closed on all sides, reducing the volume of the mold cavity at least in partial regions thereof after it has been filled with the mixture of coated plastic foam granules, triggering a reaction of the liquid primary material by applying pressure and heat until a continuous cellular structure of plastic foam has been formed and the plastic foam granules have been interconnected by the cellular structure of plastic foam after the volume of the mold cavity has been reduced at least in partial regions thereof, ventilating gaseous reaction media from the mold cavity through openings in the sides of the mold, and removing the three-dimensional shaped part from the mold cavity.

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