Plastic article or earthenware shaping or treating: apparatus – Means applying electrical or wave energy directly to work – Electro-static or inductive field
Patent
1990-03-02
1991-09-24
Chiesa, Richard L.
Plastic article or earthenware shaping or treating: apparatus
Means applying electrical or wave energy directly to work
Electro-static or inductive field
264 25, 264226, 264322, 425385, 425397, 425407, B29C 3508
Patent
active
050510835
ABSTRACT:
The impressions are produced using an original plate (19) bearing a design by the following steps: a plastic plate (4) made of thermodeformable material is prepared and placed, in an adjusted position corresponding to the location of the first impression to be produced, between an electrode (7), the outline of which corresponds to the periphery of the design and which is surrounded by an insulating border (24), and the original plate (19) which forms a second electrode; the first impression is produced on the plastic plate (4) by high-frequency heating of the plastic plate (4) via the electrodes, and by compression; the plastic plate (4) is then cooled, the original plate (19) is separated from the plastic plate (4) that is displaced successively in the other adjusted positions corresponding to the other impressions to be produced and, in each position, the heating, compression and cooling steps are repeated in order to reproduce the next impression.
REFERENCES:
patent: 1991009 (1935-02-01), Browne et al.
patent: 2463289 (1949-03-01), Leguillon
patent: 2754606 (1956-07-01), Williams
patent: 2920172 (1960-01-01), Stallard
patent: 3101668 (1963-08-01), Leeds
patent: 3697657 (1972-10-01), Kisker et al.
patent: 4285744 (1981-08-01), Rudolf et al.
Chiesa Richard L.
De La Rue Giori S.A.
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