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Carbon Resistance Strip: Carbon and Phenolic Resin in Ethyl Acetate, Cured on Semi-Cured Phenolic Sheet
Ed

Imeundwa na

Ed

21. Oktoba 2026FI
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Carbon Resistance Strip: Carbon and Phenolic Resin in Ethyl Acetate, 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 (ethyl acetate) 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.
Kati
1 day

Maagizo

1

Mix 21 carbon, 26 resin, 53 solvent

Make a solution of 21 % carbon, 26 % phenol-formaldehyde resin and 53 % ethyl acetate. The patent says the exact proportions are not essential; this is its example.

Vifaa kwa hatua hii:

KaboniKaboni21 parts
Bakelaiti ya kimiminika (bidhaa ya mgandamano wa fenoli na formaldehaidi)Bakelaiti ya kimiminika (bidhaa ya mgandamano wa fenoli na formaldehaidi)26 parts

Zana zinazohitajika:

Ethyl AsetatiEthyl Asetati
Mizani ya mizani-mbiliMizani ya mizani-mbili
Bikari ya kiooBikari ya kioo
KikorogoKikorogo
Barakoa ya uso mzima ya kupumuaBarakoa ya uso mzima ya kupumua
Glavu za mpiraGlavu za mpira
2

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.

Vifaa kwa hatua hii:

Karatasi ya fenoli iliyoiva nusuKaratasi ya fenoli iliyoiva nusu1 kipande

Zana zinazohitajika:

Jozi ya roli za kupaka kwa kuchovyaJozi ya roli za kupaka kwa kuchovya
Barakoa ya uso mzima ya kupumuaBarakoa ya uso mzima ya kupumua
Glavu za mpiraGlavu za mpira
3

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.

Zana zinazohitajika:

Roli za kalenda zilizopashwa jotoRoli za kalenda zilizopashwa joto
Glavu Zinazostahimili JotoGlavu Zinazostahimili Joto
4

Cut into strips

Cut the sheet across into strips of the width wanted. Ours: tin snips.

Zana zinazohitajika:

Mkasi wa batiMkasi wa bati
Glavu za mpiraGlavu za mpira

Vifaa

3

Zana Zinazohitajika

10

Mchoro huu unatengeneza

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Kishikilia nafasi

Kipengele cha Upinzani cha Kaboni

Free

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Blueprint zinazohusiana

Blueprint hizi zinashiriki maarifa — mbinu, vifaa au kanuni

Liquid Bakelite: Phenol and Formalin Heated Together, the Oily Layer Kept (Baekeland 1909)
Hatari

Liquid Bakelite: Phenol and Formalin Heated Together, the Oily Layer Kept (Baekeland 1909)

na CharlieDE

Viwandani

3
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Carbon Resistance Element: Lampblack in Alkyd and Chinese Wood Oil on Laminated Phenolic

Carbon Resistance Element: Lampblack in Alkyd and Chinese Wood Oil on Laminated Phenolic

na EdFI

Elektroniki

3
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CC0 Umma Wote

Mchoro huu umetolewa chini ya CC0. Uko huru kunakili, kubadilisha, kusambaza, na kutumia kazi hii kwa madhumuni yoyote, bila kuomba ruhusa.

Saidia Mtengenezaji kwa kununua bidhaa kupitia Mchoro wao ambapo wanapata Kamisheni ya Mtengenezaji iliyowekwa na Wachuuzi, au unda marudio mapya ya Mchoro huu na uiunganishe kama kiungo katika Mchoro wako kuchangia mapato.

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