UBUHANZI
UBWIZA N'UBUZIMA
UBUKORIKORI
UMUCO N'AMATEKA
IMYIDAGADURO
IBIDUKIKIJE
IBIRIBWA N'IBINYOBWA
UBWUBATSI BUSUBIRA INYUMA
UBUMENYI
SIPORO
IKORANABUHANGA
IBYAMBARWA
Rubber and Silicone Forming: Tubing, Sheet, O-Rings and Bands
Rubber is shaped soft and then cured, the curing locking its shape and giving it its spring. Natural rubber is mixed on a two-roll mill with sulfur and activators such as zinc oxide; silicone rubber comes as a ready compound. Tubing is extruded through a ring die and cured with heat; rubber bands are extruded tube cured on mandrels and sliced across. Sheet is calendered between rolls and cured. O-rings and gaskets are compression moulded: a measured charge is laid in a heated mould cavity, the press closes, the heat cures it, and the thin flash is trimmed off.
Hejuru
Minutes per moulding (industrial)
Amabwiriza
1
1
Why rubber is cured
Why rubber is cured
What sulfur does to natural rubber.
2
2
Compound
Compound
Natural rubber is worked on a two-roll mill and the sulfur and zinc oxide are mixed in evenly.
Ibikoresho by'iyi ntambwe:
Urupapuro rw'umupira rwumishijwe n'umwotsi50 kg
Ifu ya sufuru1 kg
Ifu ya oxide ya zinki2 kgIbikoresho bikenewe:
Urusyo rw'umupira rufite roulo ebyiri3
3
Extrude tubing
Extrude tubing
Compound or silicone is extruded through a ring die as tube and cured with heat; for rubber bands, the tube is cured on mandrels and sliced across into bands.
Ibikoresho by'iyi ntambwe:
Uruvange rw'umupira wa silicone20 kgIbikoresho bikenewe:
Imashini isohora pulasitiki
Icyuma cyo gusohoramo
Itanura ryo koroshya ibyuma4
4
Calender sheet
Calender sheet
Compound is pressed into an even sheet between rolls and cured.
Ibikoresho bikenewe:
Urusyo rw'umupira rufite roulo ebyiriItanura ryo koroshya ibyuma5
5
Compression mould O-rings
Compression mould O-rings
A measured charge goes into each cavity of a heated O-ring mould; the press closes and holds until the rubber cures; the mould opens and the flash is trimmed.
Ibikoresho bikenewe:
Ikandagira rishyushye ryo kubumba hakandwa
Ikibumbiro cyo gukanda6
6
Check
Check
Inside diameter, cross-section and wall thickness are measured.
Ibikoresho bikenewe:
Ikigereranyo cya Digitale cy'Amasentimetero 6Ibikoresho
4- Umwanya
- 1 kgUmwanya
- Umwanya
- Umwanya
Ibikoresho bikenewe
7- Umwanya
- Umwanya
- Umwanya
- Umwanya
Iki gishushanyo gikora
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