B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 67/20 (2006.01) B26F 1/24 (2006.01) B29C 51/18 (2006.01) B29C 51/32 (2006.01) B65D 81/26 (2006.01) B29C 47/00 (2006.01) B29C 51/08 (2006.01)
Patent
CA 2165016
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.
Buijsch Jan Op Den
Daniels Paul
Joppen Henk
Depron B.v.
Fetherstonhaugh & Co.
Hoechst Aktiengesellschaft
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