LESSON 7.2 · 1:55 · CHAPTER 7 · FIBRE, RESIN AND TENSION
How you unwind decides the twist
Pulling tow off the end of a stationary spool puts in one twist per wrap unwound; paying it off tangentially from a rotating spool puts in none. A twisted band is narrower and thicker, leaving gaps and dry spots.
Predict · at 0:30 in the video
A pipe 3 metres long, 255 millimetres across, with a 0.75 millimetre wall, wound off the end of the spool. Roughly how many twists go into it?
About five thousand. The wall holds 1.8 litres. With a 12K carbon tow at 60 percent fibre, that's about 2.4 kilometres of tow.
Further reading
This course is our own. These books go deeper.
- Composite Filament Winding, S. T. Peters (ed.), ASM International, 2011
- Filament Winding: a Unified Approach, S. Koussios, Delft University Press, 2004
About the numbers
Simulations in this lesson are our own. Where a number rests on an assumption, the video marks it with an asterisk and says where it comes from.
Up next · 7.3 · 1:58Tension and angle squeeze out resin