Arrangement for pressing flexible discs and a pressing process using this arrangement
AssigneeThomson-CSF
InventorsRaymond Llabres, Liliane Fournier, Claire Lemonon
Life of this patent
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Abstract
The invention relates to an arrangement for pressing flexible discs by compression under heat, comprising heating plates, each carrying a plate of flexible closed-cell foam similar in diameter to the engraved matrices. The flexible disc to be pressed is placed between an engraved matrix and a counter plate or a second engraved matrix, the assembly being placed between the plates of closed-cell foam in such a way that, during compression, these cellular foam plates act as a pneumatic compensator and enable the pressure to be uniformly distributed over the surface to be engraved.
Claims6
An arrangement for copying by heat pressing onto a flexible thermoformable sheet an engraved relief comprising:
- first and second matrices for receiving said sheet therebetween, of which at least one matrix carries said engraved relief facing one side of said sheet;
- two parallel plates of which at least one is a heating plate;
- and
- pneumatic compensator means between said plates including first and second pads for receiving between them said matrices and sheet, at least one of said pads being made of foam having gas filled, closed cells for pneumatically transmitting the pressure supplied by said parallel plates to said matrices.
Dependencies are inferred from the claim text.