In The Name Of ALLAH,
The Most Gracious,The Most Merciful.
Department of Textile Engineering
Mehran University of Engineering &
METHOD OF WEFT INSERTION IN
SHUTTLEES WEAVING MACHINES
The picking action is accomplished by a small Bullet like
Gripper(Projectile), which grips the weft yarn & carries it through
Several gripper are normally used in the loom , while one is
crossing the loom with the weft yarn, the others are return to the
starting position. The return by conveyer chain.
DRAW BACK OF PROJECTILE:-
The dragging of the weft yarn across a loom
creates strain on the yarn so projectile loom are
not suitable for weak yarn.
A Rapier loom use a Rapier to pull the weft yarn across the loom.
For a single Rapier a long rapier device is
required to extend across the full width of warp.
Two rapier enter the shed from opposite side of
loom & transfer the weft yarn from one rapier to
another rapier near centre of loom. Double Rapier
further divided into two categories 1) Flexible
Rapier & 2) Rigid Rapier
3) AIR JET ;-
In this weft yarn across the loom by using high speed(compress) of
air . Nozzle are used to insert the weft yarn into the shed. The
Fabric width of Air Jet loom is normally narrower than Rapier or
Air jet loom cannot produce great variety of fabrics.
4) WATER JET LOOM:-
In this water is shoot under high force & with it a weft yarn.
The force of water as it propelled across the shed cross the yarn to
opposite side ..
In water jet unit use vacuum suction & heat to remove
water from the fabrics.
Only use for Hydrophobic fibres.