UBUHANZI
UBWIZA N'UBUZIMA
UBUKORIKORI
UMUCO N'AMATEKA
IMYIDAGADURO
IBIDUKIKIJE
IBIRIBWA N'IBINYOBWA
UBWUBATSI BUSUBIRA INYUMA
UBUMENYI
SIPORO
IKORANABUHANGA
IBYAMBARWA
Carbon Resistance Strip: Carbon and Phenolic Resin in Acetone, Cured on Semi-Cured Phenolic Sheet
Podolsky (Wirt Company, US 2,060,114, 1936) bonded the carbon film into its base: the phenolic sheet is only half cured, the coating carries the same kind of resin, and its solvent (acetone) softens the sheet's surface. Heated calender rolls then finish the cure of sheet and coating together, so the track is hard, does not rub off and lasts. Cut across, the sheet gives resistance strips for a variable resistor.
The picture: our diagram.
Hagati
1 day
Amabwiriza
1
1
Mix 21 carbon, 26 resin, 53 solvent
Mix 21 carbon, 26 resin, 53 solvent
Make a solution of 21 % carbon, 26 % phenol-formaldehyde resin and 53 % acetone. The patent says the exact proportions are not essential; this is its example.
Ibikoresho by'iyi ntambwe:
Karubone21 parts
Bakelite y'amazi (ikomoka ku guhuza fenoli na formaldehyde)26 partsIbikoresho bikenewe:
Asetone
Umunzani w'ibiro
Igikombe cy'Ikirahure
Igikoresho cyo kuvanga
Agapfukamunwa gapfuka isura yose
Uturindantoki tw'ikawusu2
2
Coat the semi-cured sheet
Coat the semi-cured sheet
Use a phenolic sheet whose cure was stopped before it fully hardened. A roller turning in a pan of the solution coats its underside.
Ibikoresho by'iyi ntambwe:
Urupapuro rwa fenoli rudahiye neza1 igiceIbikoresho bikenewe:
Imizingo ibiri yo gusiga ibintu mu gushyiramoAgapfukamunwa gapfuka isura yoseUturindantoki tw'ikawusu3
3
Cure between calender rolls at 350 °F
Cure between calender rolls at 350 °F
Pass the coated sheet between calender rolls heated to about 350 °F (177 °C). This finishes the cure and bonds the coating to the sheet. The patent sometimes calenders it again to burnish the surface.
Ibikoresho bikenewe:
Imizingo ishyushye ya kalandire
Uturindantoki twihanganira ubushyuhe4
4
Cut into strips
Cut into strips
Cut the sheet across into strips of the width wanted. Ours: tin snips.
Ibikoresho bikenewe:
Ibyuma bikata ibyuma bisanzweUturindantoki tw'ikawusuIbikoresho
3- 21 partsUmwanya
- Umwanya
- Umwanya
Ibikoresho bikenewe
10- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
Iki gishushanyo gikora
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Iyi blueprint yasohowe munsi ya CC0. Ushobora gukoporora, guhindura, gukwirakwiza no gukoresha nta kwemererwa.
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