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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.
Katamtaman
1 day
Mga Tagubilin
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.
Mga materyales para sa hakbang na ito:
Karbon21 parts
Likidong Bakelite (produktong kondensasyon ng phenol at formaldehyde)26 partsMga kailangang kasangkapan:
Acetone
Timbangang panimbang
Basong Salamin na Pang-agham
Panghalo
Respirador na buong-mukha
Gwantes na goma2
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.
Mga materyales para sa hakbang na ito:
Kalahating-tuyong phenolic na piraso1 pirasoMga kailangang kasangkapan:
Pares ng roller para sa dip coatingRespirador na buong-mukhaGwantes na goma3
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.
Mga kailangang kasangkapan:
Mga pinainit na calender roll
Guwantes na Matibay sa Init4
4
Cut into strips
Cut into strips
Cut the sheet across into strips of the width wanted. Ours: tin snips.
Mga kailangang kasangkapan:
Gunting na pangyeroGwantes na gomaMga Materyales
3- 21 partsPlaceholder
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Mga Kinakailangang Kasangkapan
10- Placeholder
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