Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Shaping by extrusion
Patent
1998-02-17
2000-08-15
Davis, Robert
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Shaping by extrusion
264321, 83866, 83867, 83868, 425290, 425384, 425385, 425388, B26F 124, B29C 51108, B29C 5136
Patent
active
061031631
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 includes 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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