Terms: ( wpi) wraps per Inch
(ypp) yards per pound
Worsted :
This type of yarn is the most common commerical yarn made. The fibers are aligned in one direction and tightly spun. This method uses longer fibers 3 - 6 inches, which increases the strengtht of the yarn, however it can decrease the handle.
Semi Worsted:
This is the most common and desired yarn processing request. It is a combination of both worsted and woolen. Which is using the long and short fibers.The fibers are then aligned in one direction however not as tightly, allowing for some air in the yarn to create a soft handle and some loft to the yarn like a woolen yarn.
Woolen:
This type of yarn creates a bulky, soft and lofty yarn. Fibers used to create a woolen yarn are short 2.5 inches or less and the fibers have a random arrangement trapping air.
Weight Category:
Lace 24 + wpi 1800 + ypp
Fingering 18 -24 wpi 1200 - 1800 ypp
Sport weight (semi worsted)
14-16 wpi 1100 - 1800 ypp
DK weight ( DK stands for double knit)
12-14 wpi 900 -1100 ypp
Worsted weight 10 - 12 wpi 900 - 1100
Bulky weight 8 - 10 wpi 400 - 900 ypp
Very Bulky 8 or fewer wpi 100 - 500 ypp
