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Carbon Resistance Strip: Carbon and Phenolic Resin in Acetone, Cured on Semi-Cured Phenolic Sheet
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Yenziwe ngu-

Ed

21. uMfumfu 2026FI
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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.
Ophakathi
1 day

Imiyalelo

1

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.

Izinto zokwakha zalesi sinyathelo:

I-carbonI-carbon21 parts
I-Bakelite eketshezi (umkhiqizo wokuhlangana kwe-phenol ne-formaldehyde)I-Bakelite eketshezi (umkhiqizo wokuhlangana kwe-phenol ne-formaldehyde)26 parts

Amathuluzi adingekayo:

I-acetoneI-acetone
Isikali sesilinganisoIsikali sesilinganiso
Ibhikha LengilaziIbhikha Lengilazi
IsigovuziIsigovuzi
Imaski yokuphefumula yobuso bonkeImaski yokuphefumula yobuso bonke
Amagilavu erabhaAmagilavu erabha
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.

Izinto zokwakha zalesi sinyathelo:

Ishidi le-phenolic elivuthwe uhhafuIshidi le-phenolic elivuthwe uhhafu1 ucezu

Amathuluzi adingekayo:

Uhlobo lwama-roller amabili okugcoba ngokucwilisaUhlobo lwama-roller amabili okugcoba ngokucwilisa
Imaski yokuphefumula yobuso bonkeImaski yokuphefumula yobuso bonke
Amagilavu erabhaAmagilavu erabha
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.

Amathuluzi adingekayo:

Izidingi zekhalenda ezifudumeziweIzidingi zekhalenda ezifudumeziwe
Amagilavu Amelana NokushisaAmagilavu Amelana Nokushisa
4

Cut into strips

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

Amathuluzi adingekayo:

Isikeli sensimbiIsikeli sensimbi
Amagilavu erabhaAmagilavu erabha

Izinto

3

Amathuluzi Adingekayo

10

Le blueprint yenza

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Isibambeli

Isici Sokumelana Nogesi Se-Carbon

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Ama-blueprint ahlobene

Lama-blueprint abelana ngolwazi — amasu, izinto noma izimiso

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

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

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Kwezimboni

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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

ngu-EdFI

I-Elekthronikhi

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