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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.
中级
1 day
说明
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 % ethyl acetate. The patent says the exact proportions are not essential; this is its example.
此步骤所需材料：
碳21 parts
液态酚醛树脂（苯酚-甲醛缩合产物）26 parts所需工具：
乙酸乙酯
等臂天平
玻璃烧杯
搅拌器
全面罩呼吸器
橡胶手套2
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.
此步骤所需材料：
半固化酚醛片1 个所需工具：
浸涂辊对全面罩呼吸器橡胶手套3
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.
所需工具：
加热压光辊
耐热手套4
4
Cut into strips
Cut into strips
Cut the sheet across into strips of the width wanted. Ours: tin snips.
所需工具：
铁皮剪橡胶手套此蓝图制作
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