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UBUHANZI
UBWIZA N'UBUZIMA
UBUKORIKORI
UMUCO N'AMATEKA
IMYIDAGADURO
IBIDUKIKIJE
IBIRIBWA N'IBINYOBWA
UBWUBATSI BUSUBIRA INYUMA
UBUMENYI
SIPORO
IKORANABUHANGA
IBYAMBARWA
Extruded Polystyrene Foam: Propylene-Blown Log Let Out at 50 °C (McIntire, Dow 1948, Ex. 3, Test 2)
Extruded polystyrene foam blown with a propylene gas fraction instead of methyl chloride. Polystyrene stands two days at 40 °C with the propylene under pressure and becomes a gel. Let out at 50 °C (250 psi in the tower), it swelled into a log 6 to 9 inches across, weighing 4.8 lb per cubic foot, with somewhat smaller, uniform cells.
Source: O. R. McIntire (Dow), US 2,450,436 (1948), Example 3. Picture: the patent's drawing.
Hejuru
3 days
Amabwiriza
1
1
Charge the tower with polystyrene
Charge the tower with polystyrene
Charge a high-pressure tower with 300 lb of granular polystyrene.
Ibikoresho by'iyi ntambwe:
Polisitirene300 lbsIbikoresho bikenewe:
Reyakitori y'igitutu
Umunzani w'ibiro
Uturindantoki tw'ikawusu2
2
Add the propylene fraction
Add the propylene fraction
Add 100 lb of a cracked-oil gas fraction that is about 93 % propylene, under pressure, and close the tower. Propylene is a flammable gas: no flames, strong ventilation.
Ibikoresho by'iyi ntambwe:
Propilene100 lbsIbikoresho bikenewe:
Ibariro rya gazi ifite igitutuReyakitori y'igitutu
Amadarubindi yo Kwirinda Ibinyabutabire3
3
Stand two days at 40 °C
Stand two days at 40 °C
Let the tower stand for two days at 40 °C while the polystyrene takes up the propylene.
Ibikoresho bikenewe:
Reyakitori y'igitutu
Igipima Ubushyuhe cy'Ubushakashatsi4
4
Let it out at 50 °C
Let it out at 50 °C
Open the valved outlet near the bottom (3.25 inch in the patent) at 50 °C. The pressure is about 250 psi. The gel flows out and swells into a log 6 to 9 inches across, 4.8 lb per cubic foot, with somewhat smaller, uniform cells. Close the outlet again. The patent heated step by step (50, 60, 75 °C) for several hours each, letting a portion out at each step.
Ibikoresho bikenewe:
Reyakitori y'igitutuIgipima Ubushyuhe cy'UbushakashatsiAmadarubindi yo Kwirinda IbinyabutabireUturindantoki tw'ikawusu5
5
Saw into boards
Saw into boards
When the foam has set, saw it lengthwise into slabs (ours: a woodworking saw).
Ibikoresho bikenewe:
Umusumeno w'ababajiUturindantoki tw'ikawusuIbikoresho bikenewe
7- Umwanya
- Umwanya
- Umwanya
- Umwanya
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