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ẸWÀ ÀTI ÌLERA
IṢẸ́ ỌWỌ́
ÀṢÀ ÀTI ÌTÀN
ÌṢERÉ
ÀYÍKÁ
OÚNJẸ ÀTI OHUN MÍMU
REVERSE ENGINEERING
SÁYẸ́ǸSÌ
ERÉ ÌDÁRAYÁ
ÌMỌ̀-Ẹ̀RỌ
ÀWỌN OHUN WÍWỌ̀
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.
Àárín
1 day
Ìlànà
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.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Carbon21 parts
Bakelite olómi (èsì ìdàpọ̀ fénólì àti fọ́málídáháìdì)26 partsÀwọn irinṣẹ́ tí a nílò:
Acetone
Òǹwọ̀n ìdọ́gba
Ago Gílásì
Ohun ìrúwé
Ìbòjú ìmí tí ó bo gbogbo ojú
Ìbọ̀wọ́ rọ́bà2
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.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Pẹpẹ phenolic tí a sè ní ìdajì1 ẹyọÀwọn irinṣẹ́ tí a nílò:
Àwọn ọ̀pá yíyípo méjì fún bíbo nípa fífi bọ̀Ìbòjú ìmí tí ó bo gbogbo ojúÌbọ̀wọ́ rọ́bà3
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.
Àwọn irinṣẹ́ tí a nílò:
Àwọn ìyípo kálẹ́ńdà tí a mú gbóná
Ìbọ̀wọ́ Tí Ń Fara Da Ooru4
4
Cut into strips
Cut into strips
Cut the sheet across into strips of the width wanted. Ours: tin snips.
Àwọn irinṣẹ́ tí a nílò:
Ìlàǹkàn irinÌbọ̀wọ́ rọ́bàÀwọn ohun-èlò
3- 21 partsÀyè
- Àyè
Ìtọ́nisọ́nà yìí ń ṣe
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