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Nylon Thread: Melt-Spun Monofilament, Cold-Drawn Between Two Drums, Carothers
Nylon sewing thread is a single clear strand, a monofilament. Carothers' patent (1938) spins nylon 66 straight from the melt at 285–295 °C, with oxygen kept out, and catches the strand on a drum. A second, faster drum then stretches it (cold drawing), which makes it strong.
The picture: our own drawing.
Juu
1 day
Maagizo
1
1
Load the pot under nitrogen
Load the pot under nitrogen
Fill the melt-spinning pot with dry nylon 66 pellets and close it. Flush it with nitrogen and keep it under nitrogen: oxygen must stay out of the molten polymer.
Vifaa kwa hatua hii:
Chembechembe za nailoni500 gZana zinazohitajika:
Chungu cha Kusokota kwa Myeyuko
Naitrojeni
Mtungi wa gesi yenye shinikizo2
2
Melt at 285–295 °C
Melt at 285–295 °C
Heat to 285–295 °C, the best spinning heat for nylon 66. Cooler gives poorer filament; hotter makes it too runny, and it may break down.
Zana zinazohitajika:
Chungu cha Kusokota kwa Myeyuko
Themokapo yenye kionyeshi3
3
Extrude and catch it
Extrude and catch it
Press the melt out through the hole with nitrogen pressure (Carothers' example used 50 lb/in²). Catch the strand on a motor-driven drum. A larger hole gives a thicker strand; hotter melt and faster winding give a finer one.
Zana zinazohitajika:
NaitrojeniMtungi wa gesi yenye shinikizo
Ngoma ya Kukusanya
Mota ya umeme4
4
Cold-draw onto a faster drum
Cold-draw onto a faster drum
Run the strand from the first drum onto a second drum turning faster, which stretches it. In Carothers' example the drums ran at 300 and 1020 ft/min. Keep the strand wet: wet filament draws better and holds no static.
Zana zinazohitajika:
Ngoma ya KukusanyaMota ya umeme
Maji5
5
Help a thick strand
Help a thick strand
Thick strands are harder to draw. Soak them in water, or warm them to about 100 °C, before drawing.
Zana zinazohitajika:
Sufuria yenye kuta ndefuMajiVifaa
1- Kishikilia Nafasi
Zana Zinazohitajika
8- Kishikilia Nafasi
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