B - Operations – Transporting – 29 – D
Patent
B - Operations, Transporting
29
D
18/101
B29D 17/00 (2006.01) B29C 35/08 (2006.01) B29C 43/02 (2006.01) G11B 3/70 (2006.01)
Patent
CA 1106560
ABSTRACT: The invention relates to a method of manufac- turing a plastics record carrier, in particular a video disc, in which a mould is provided with a fluid moulding resin across which a substrate is provided. After curing the resin the assembly of substrate and cured layer of moulding resin bonded thereto is removed from the mould. According to the invention the substrate is spherosymmetrically vaulted and as such pressed against the quantity of moulding resin present centrally on the mould. The moulding resin is rolled over the surface of the mould with a circular fluid front with simultaneous deformation of the vaulted substrate. After the moulding resin has been spread over the whole mould and the plane surface, the moulding resin is cured. Thevaulting of the substrateis preferably realized by flexibly suspending a plane substrate at the edge and then adjusting a different gas pressure on both sides of the substrate. The moulding resin is preferably a radiation-curable moulding resin which is cured by exposure to, for example, ultra-violet light via the substrate. The invention also relates to a device for carrying out the above method which comprises inter alia a holder for the substrate which has a cylindrical flexible collar the end face of which comprises means to connect the substrate to the collar in a detachable and air-tight manner. -21-
298551
Broeksema Egbert
Kraakman Hillebrand J.j.
Nijboer Sjoerd
N.v. Philips Gloeilampenfabrieken
Van Steinburg C.e.
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