Fabrication of foil disc pressing matrices

Details Fabrication of foil disc pressing matrices Fabrication of foil disc pressing matrices

1974-02-21

1976-05-11

Tufariello, T. M.

Chemistry: electrical and wave energy

Processes and products

204281, B29D 1700, C25D 100

Patent

active

039560759

ABSTRACT:
A matrix, which is to be employed for pressing foil disc copies carrying a spiral groove which is highly concentric to the axis of disc rotation, is formed by electrodeposition from a lacquer foil original which is cut to form a groove corresponding to such spiral groove and to form additional grooves deeper than the spiral groove and having a form that produces, on the matrix, sharp edges capable of directly cutting the outer periphery and center hole of a foil disc copy.

REFERENCES:
patent: 2067502 (1937-01-01), Pollard et al.
patent: 2092880 (1937-09-01), Hunter et al.
patent: 3584094 (1971-06-01), Rock et al.
patent: 3787275 (1974-01-01), Genma
patent: 3801476 (1974-04-01), Roschmann et al.

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