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PTFE Film: Powder Rolled Thin, a Minute at 400 °C, Quenched (Brubaker & Hanford 1946)
Fed between two smooth rolls set 1–2 thousandths of an inch apart, PTFE powder comes out as a fragile film. One minute in a furnace at 400 °C and a dip in cold water turn it into a tough, flexible film. Rolling it again cold makes it stronger and clearer.
Source: M. M. Brubaker and W. E. Hanford (du Pont), US 2,400,099 (1946), Example III. The furnace and quench bucket are ours. Picture drawn by Youblob.
Ilọsíwájú
1 day
Ìlànà
1
1
Set the rolls 1–2 mils apart
Set the rolls 1–2 mils apart
Set a pair of smooth calender rolls to a gap of about 1 to 2 mils (0.001–0.002 in).
Àwọn irinṣẹ́ tí a nílò:
Àwọn ìyípo kálẹ́ńdà dídán
Máíkírómítà2
2
Roll the powder into film
Roll the powder into film
Feed powdered PTFE between the rolls. The film that comes out is fragile: handle it gently.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Erùpẹ̀ resini PTFE1 as requiredÀwọn irinṣẹ́ tí a nílò:
Àwọn ìyípo kálẹ́ńdà dídán3
3
One minute at 400 °C
One minute at 400 °C
Pass the film through a furnace at 400 °C so that each part stays in the heat for about 1 minute.
Àwọn irinṣẹ́ tí a nílò:
Ààrò muffle
Thermocouple pẹ̀lú ìkà
Ẹ̀mú4
4
Quench in cold water
Quench in cold water
Quench it straight into cold water. The film is now tough, flexible and even.
Àwọn irinṣẹ́ tí a nílò:
Àpótí ìtutù5
5
Cold-roll it (optional)
Cold-roll it (optional)
Rolling the film again cold makes it stronger and clearer. The patent gives no gap for this pass.
Àwọn irinṣẹ́ tí a nílò:
Àwọn ìyípo kálẹ́ńdà dídánMáíkírómítàÀwọn ohun-èlò
1- 1 as requiredÀyè
Àwọn irinṣẹ́ tó nílò
6- Àyè
- Àyè
- Àyè
- Àyè
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