Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Shaping against forming surface
Patent
1995-12-08
1998-02-24
Davis, Robert
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
Shaping against forming surface
83866, 83867, 83868, 425290, 425384, 425385, 425388, B26F 0124, B29C 51108, B29C 5136
Patent
active
057209154
ABSTRACT:
Open-cell plastic foam sheets with smooth, closed surfaces are heated up to a predetermined temperature after extrusion, are thermoformed in a thermoforming unit with the aid of a vacuum on both sides and are thermoset. One of the two closed surface skins of the plastic foam sheet is perforated with the aid of needles 4 arranged movably in a mold block 11. The mold block 11 is a component part of a thermoforming unit 10 and, together with a further mold block 9, forms the mold of this thermoforming unit. The mold block 11 for the inner side 13 of a plastic foam sheet 16 comprises a male mold 1, a cooling plate 2, a vacuum plate 3, the movable needles 4, a needle plate 5, springs 6 for the return of the needle. plate and also diaphragms 7 and a mounting plate 8, which are held together by screws 30.
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Buijsch Jan op den
Daniels Paul
Joppen Henk
Davis Robert
Depron B.V.
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