TO STUDY VARIOUS YARN PACKAGES (Textile)
- Type of wound
- Type of withdrawal
- End use
THEORY:
Let d=diameter of packages
X=rotational speed (rpm)
The package circumference=2?r
Package length=l
Angle of wind=?
Wind= I.e. no. of coils laid on the packages for single traverse of the guide.
Traverse ratio= i.e the no. of coils laid or the packages for a double traverse of the guide
Package surface speed=m/min
Yarn speed during winding=
Ta?=
Tan?=
TYPE OF WITH DRAWL:
Various yarn packages are as follows.
PIRN:
- Segmented winding , near parallel winding
- Over end withdrawal
CHEESE:
- May has near parallel winding or may has cross winding
USE:
Parallel sided packages or cheese are used for staple fiber yarns when unwinding is Intermittent particularly at high speeds. Occurs during the supply of weft in modern High speed non shuttle looms when it’s also desirable that the package length should not be too long .at his type of package is also
Suitable for pressure drying yarn.
CONE:
- Cross winding
USE:
Over end withdrawal Low angled tapered cones are used for High speed continuous and intermittent Unwinding of staple fiber yarns. Wider Angled tapered cones are used for dyeing of yarns. Wide angled cones are mainly used in the weft knitting process. Pineapple cones are used for continuous filament yarn.
RING CONE:
- Near parallel winding
- Over end withdrawal
ROVING BOBBIN:
- Near parallel winding
- Over end withdrawal
- It is a typical product of
- a continuous filament spinning machine
FLANGE/SPOOL:
- Parallel winding
BEAM:
- Parallel winding
————————————————————————————————————————————–
v Over head withdrawal—spindle is stationary and yarn is moving during winding or un-winding
v Parallel winding—-no. of ends are more
v Near parallel winding—-one end which is wounded
OBSERVATION:
For empty cone
d= 4 cm
D= 7cm
L=16.5 cm
For filled cone
d= 12 cm
D= 13.5 cm
L= 16 cm
CALCULATION :
tan 0=(D-d)/2
L
RESULT :
The angle for the tapered cone is