It is to show in this study how far a yarn, made by twisting a cut-material with a heavy traveller after given 50% moisture soaked through the cut-material, can be twisted.
1) When tension of twist is big, the yarn is not doub twisted but when it is small, the yarn is twisted doubly. The more tension of twist is given, the more difficult it is to put the hard twisting, and the less tension, the bigger twist shrinkage.
2) Limit twist shrinkage
yc is in proportion to thickness of a yarn when twist tension (
T) and moisture regain are constant;
yc=
aT+
b3) Limit twist number
Nc is in proportion to thinness of yarn when twist tension (
T) and moisture regain are constant;
Nc=
AT+
B4) When the paper yarn begins to be doubly twisted there is a rectilineal relation among twist tension, twist shrinkage and twist number, when the paper yarn has been doubly twisted with the same relation among them.
5) The relation between twist tension and limit twist angle by cutting is; ε
B: Strain at breakage of fiber θ′: limit twist angle
y: limit twist shrinkage (%)
T: twist tension
a,
b: constant
6) The relation between twist tension and limit twist angle by double twisting; θ: limit twist angle
t: twist tension (g/d)
c,
p: constant
7) When already twisted yarn is twisted to be cut, the more twisted raw yarn has a bigger total number of twisting and bigger shrinkage given to the yarn before cutting.
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