Ubufatanye
UBUHANZI
UBWIZA N'UBUZIMA
UBUKORIKORI
UMUCO N'AMATEKA
IMYIDAGADURO
IBIDUKIKIJE
IBIRIBWA N'IBINYOBWA
UBWUBATSI BUSUBIRA INYUMA
UBUMENYI
SIPORO
IKORANABUHANGA
IBYAMBARWA
Heil and Esch · Public domain (1909)
Rubber Stoppers: Pará Rubber with Ceresine, Moulded and Cured (Heil & Esch 1909)
Laboratory rubber stoppers from a 1909 rubber factory's book of mixings: Pará rubber with ceresine wax, sulphur and magnesia, run out as a cord, cut to weight, pressed into moulds and cured.
Source: Heil & Esch, The Manufacture of Rubber Goods (1909), mixing No. 34 (p. 108) and the stopper method (p. 135). They give no cure time or temperature. Using smoked ball rubber as their Pará, and the mill, clamps and steam vessel, are ours. Picture: their page of mixings.
Hagati
1 day
Amabwiriza
1
1
Weigh mixing No. 34
Weigh mixing No. 34
Weigh out 10,000 g Pará rubber, 2,000 g ceresine, 1,000 g sulphur and 100 g calcined magnesia (magnesia usta).
Ibikoresho by'iyi ntambwe:
Umupira w'ikawusu wumishijwe n'umwotsi10000 g
Ibishashara bya seresine2000 g
Ifu ya sufuru1000 g
Okiside ya magnesiyumu100 gIbikoresho bikenewe:
Umunzani w'ibiro2
2
Mix on the rolls
Mix on the rolls
Work the rubber on the mixing rolls and work the ceresine, sulphur and magnesia into it until the mixing is even.
Ibikoresho bikenewe:
Urusyo rw'umupira rufite roulo ebyiri3
3
Run a cord on the tube machine
Run a cord on the tube machine
Run the mixing through the tube machine as a cord of a size to suit the stoppers. It must be free from air bubbles, or the stoppers will be faulty after curing.
Ibikoresho bikenewe:
Imashini ikora imiheha ya kawucu4
4
Cut pieces to weight
Cut pieces to weight
Cut the cord into pieces of the exact weight of one stopper plus 2 or 3 per cent, for what squeezes out of the mould.
Ibikoresho bikenewe:
Icyuma cy'UbukorikoriUmunzani w'ibiro5
5
Press into moulds and clamp
Press into moulds and clamp
Press each piece into a mould and clamp the small moulds very tightly in iron clips.
Ibikoresho bikenewe:
Iforomo yo guteka ikawucu
Igifata gifite ishusho ya C6
6
Cure in steam
Cure in steam
Cure the clamped moulds in a steam heater (Heil & Esch also name the sulphur bath). They give no time or temperature for stoppers; then open the moulds and take out the stoppers.
Ibikoresho bikenewe:
Otokilave yo ku mezaIforomo yo guteka ikawucuIbikoresho
4- Umwanya
- 2000 gUmwanya
- 1000 gUmwanya
- Umwanya
Ibikoresho bikenewe
7- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
Iki gishushanyo gikora
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