Technically the process of twisting the strands together is called ‘to ply yarn’. A single strand of yarn is called a ‘single’ but most people will call it ‘single ply’ instead. 2 ply yarn is created from twisting two singles, 3 ply from 3 singles and so forth. Plied yarn is typically stronger than single strand yarn. But as mentioned earlier, there can be a lot of variation in strand size. The thickness of a given yarn is determined by the individual thickness of the plies, not by the number of plies. If the plies are thin, a 4-ply yarn can be finer than a heavy, single-ply yarn. Although there are no official categories for yarn weights, many knitting books and yarn manufacturers use common terms to indicate a yarn’s thickness and the size of the needle with which you work on the yarn. Thus, using ‘ply’ as a standard is problematic.
Yarns are composed of two or more single yarns twisted together. E.g. 2 ply yarn is composed of two single strands; 3 ply yarn is composed of three single strands. The thickness of a given yarn is determined by the individual thickness of the plies, not by the number of plies.
Tips:
- Never mix 2 brands even if they claim to be the same ply. For e.g. I never recommend mixing Hobby Store DK Special and Hobby Store DK Cake in a project even though they are 4 ply, their thickness varies a little.
- Dyed yarns are more thicker than their white counterparts. Meaning – a coloured yarn may feel thicker than the same brand white yarn even if their ply is the same.
- Blended yarns are much thicker than both dyed and white ones even if they are the same brand. Blended means the colour was made by mixing two or more colours of yarns.
- So if you feel a yarn isn’t thick enough for a project, don’t think it has been wasted. Try to double it and use in. As in – use 2 strands instead of one. I, personally, do that a lot. So I can vouch for it 🙂
- If you are really keen on pointing out that this yarn isn’t 4 ply because its not thick. Wait. Take a moment to split the yarn and check how much ply is it? and you will have the answer!
