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AMASIKO NOMLANDO
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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.
Osezingeni eliphezulu
1 day
Imiyalelo
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.
Izinto zokwakha zalesi sinyathelo:
Ama-pellet e-nylon500 gAmathuluzi adingekayo:
Ibhodwe Lokuphotha Ipolimeri Encibilikisiwe
I-nitrogen
Isilinda segesi ecindezelwe2
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.
Amathuluzi adingekayo:
Ibhodwe Lokuphotha Ipolimeri Encibilikisiwe
I-thermocouple enesibonisi3
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.
Amathuluzi adingekayo:
I-nitrogenIsilinda segesi ecindezelwe
Isigubhu Sokuqoqa Intambo
Imoto kagesi4
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.
Amathuluzi adingekayo:
Isigubhu Sokuqoqa IntamboImoto kagesi
Amanzi5
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.
Amathuluzi adingekayo:
Ibhodwe elinezindonga eziphakemeAmanziIzinto
1- 500 gIsibambeli
Amathuluzi Adingekayo
8- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
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