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Electrolytic Capacitors: Borate Paper Wound with Formed Aluminium Foil and Vacuum-Impregnated (Danziger, US 2,107,780)
A dry electrolytic capacitor wound from aluminium foil and paper. The paper is first soaked in ammonium borate and dried, so the salt is already in its fibres. After winding, the bodies are soaked under heat and vacuum in borate dissolved in glycol, boxed and aged at 500 volts.
Result: electrolytic capacitors. In the patent's tests these lost only 4.8 % of their capacity, against about 33 % for bodies made the ordinary way, and their power-factor loss rose 87 % on life test against 250 %.
Source: H. I. Danziger and A. Di Giacomo, US 2,107,780 (1938). Unknown: how the anode foil is formed, which paper, the tab metal, and how the ammonium borate is made; the patent does not give them. Picture: Wikimedia Commons.
高级
1 day
说明
1
1
Salt the paper
Salt the paper
Draw the paper strip through a saturated solution of ammonium borate in water, about 15 to 30 seconds for each part of it, then dry it at about 80 °C for about 15 seconds and reel it up. The salted paper keeps until needed. Unknown: which paper. Ours: a tray for the bath and a drying oven.
此步骤所需材料：
电容器隔离纸1 strip
硼酸铵1 to saturate所需工具：
水
托盘
干燥炉2
2
Wind the bodies
Wind the bodies
On a winding machine, wind two aluminium foil strips with the salted paper between them onto a mandrel; at least one foil must already carry its electrolytic film. One paper strip is enough. Let the paper stand out at both ends, bring a connection tab out of each end, cut the strips and hold the body wound with a rubber band. Unknown: how the foil was formed, and the tab metal.
此步骤所需材料：
化成铝箔1 strip
铝箔1 strip
未知金属2 tabs所需工具：
电容器卷绕机
橡皮筋3
3
Make the impregnant
Make the impregnant
Heat ethylene glycol to about 90 °C, then stir in powdered ammonium borate slowly and continuously until the solution reaches about 122 °C. Ours: a hot plate and thermometer.
此步骤所需材料：
乙二醇1 as required硼酸铵1 as required所需工具：
电热板
温度计4
4
Soak under heat and vacuum
Soak under heat and vacuum
Rack the bodies in a vacuum tank heated to about 50 °C and draw about 745 mm of vacuum for about an hour to pull out air and moisture. Draw in the impregnant at about 85 °C, ease the vacuum to about 310 mm, and hold at about 85 °C for about another hour.
所需工具：
蒸汽夹套真空容器
真空泵温度计5
5
Box and age
Box and age
Take the bodies out, put them in cardboard containers, and age them at about 500 volts DC for about three hours.
此步骤所需材料：
纸筒1 per capacitor所需工具：
高压直流电源（台式）材料
7- 1 strip占位符
- 1 as required占位符
- 1 strip占位符
- 1 strip占位符
- 2 tabs占位符
- 1 as required占位符
- 1 per capacitor占位符
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