Steel strip for food packaging and process for production thereo

Details Steel strip for food packaging and process for production thereo Steel strip for food packaging and process for production thereo

1989-07-11

1991-06-04

Silverberg, Sam

Metal treatment

Process of modifying or maintaining internal physical...

Processes of coating utilizing a reactive composition which...

148277, 204 28, 204561, 204 41, 204 42, 204 383, 204 387, B32B 1504

Patent

active

050211048

ABSTRACT:
The suitability of the kind of steel strip known as black plate, optionally coated with small quantities of tin or nickel for food packaging, is greatly improved by ensuring the presence of a layer of P-type semiconducting oxide on the surface thereof. The ratio of the number of Type-P charge bearing atoms (NA) of that semiconducting oxide to the numbr of Type-N charge bearing atoms (ND) is greater than 1.2. The quality of the plate is yet further improved by coating the oxide surface with a thin chromic passivation layer that also contains a P-type semiconducting oxide.

REFERENCES:
patent: 3764398 (1973-10-01), Nishihara
patent: 3772165 (1973-11-01), Yamagishi
patent: 4064020 (1977-12-01), Moji
patent: 4145263 (1979-03-01), Tsutsui
patent: 4421828 (1983-12-01), Alloue
patent: 4487663 (1984-12-01), Hara
patent: 4601957 (1986-07-01), Fujimoto
patent: 4726208 (1988-02-01), Saunders
patent: 4886712 (1989-12-01), Azzerri

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