UBUHANZI
UBWIZA N'UBUZIMA
UBUKORIKORI
UMUCO N'AMATEKA
IMYIDAGADURO
IBIDUKIKIJE
IBIRIBWA N'IBINYOBWA
UBWUBATSI BUSUBIRA INYUMA
UBUMENYI
SIPORO
IKORANABUHANGA
IBYAMBARWA
Tinplate and Galvanized Steel Sheet from Coil
Thin steel rusts, so most sheet is coated in continuous lines that run a coil through at speed. Tinplate, the material of food cans, is cold-reduced steel strip about 0.15–0.55 mm thick electroplated with a thin layer of tin, around 1–11 g per square metre; the strip is then heated just past tin's melting point so the coating flows bright, and passivated and oiled. Galvanized sheet is strip run through a bath of molten zinc, the same coating as batch galvanizing done continuously; excess zinc is wiped off as the strip rises, setting the coating thickness.
Hejuru
Continuous (industrial)
Amabwiriza
1
1
Clean the strip
Clean the strip
The cold-rolled coil is uncoiled into a moving strip and cleaned so the coating will bond.
Ibikoresho by'iyi ntambwe:
Umuzingo w'icyuma gikomeye1000 kgIbikoresho bikenewe:
Umurongo wo gusiga udahagarara2
2
Tinplate: electroplate
Tinplate: electroplate
The strip runs through plating cells that deposit a thin, controlled weight of tin on both sides: 1.1–11.2 g per square metre. Here 2.8 g a side on 0.2 mm strip, about 3.6 kg of tin per tonne.
Ibikoresho by'iyi ntambwe:
Igitebo cya bati (etain)3.6 kgIbikoresho bikenewe:
Umurongo wo gusiga udahagarara3
3
Tinplate: reflow
Tinplate: reflow
The strip is heated just past tin's melting point so the matt coating flows bright, then quenched.
Ibikoresho bikenewe:
Umurongo wo gusiga udahagarara4
4
Galvanized: zinc bath
Galvanized: zinc bath
The strip dips through molten zinc and rises out; excess zinc is wiped off to set the coating. Here Z275, 275 g per square metre counting both sides, on 1 mm strip: about 35 kg of zinc per tonne.
Ibikoresho by'iyi ntambwe:
Ikibumbe cya zenke35 kgIbikoresho bikenewe:
Umurongo wo gusiga udahagarara5
5
Finish and recoil
Finish and recoil
Tinplate is passivated and lightly oiled; the coated strip is recoiled or cut into sheets.
Ibikoresho bikenewe:
Umurongo wo gusiga udahagararaIbikoresho
3- 1000 kgUmwanya
- 3.6 kgUmwanya
- 35 kgUmwanya
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