PowerPoint Presentation
COMPOUND NEEDLE WARP KNITTED MACHINE
INRODUCTIONCompound needle warp knitting machine was introduced
in 1946, with its tubular compound needles and two guides bar.It
has speed of 1000 courses per minute being more than twice of
bearded needle machine.New features - double eccentric element
drive, positive warp let-off, light spring warp tension rails.
LOOP FORMATIONThere are basically three steps involved, which
are
1. Needle rise and guide bar swing:With thesinkersforward
holding down the fabric, the hooks and tongues rise, with the hook
rising faster, until the head of the latter is level with the guide
holes. The guides then swing through to the back of the
machine.
2. The overlap and return swing: The guide swing to the front of
the machine, immediately, the hooks and the tongues start to
descend with the tongues descending more slowly, thus closing the
hooks.3. Landing and knock-over: The sinkers start to withdraw as
theneedlesdescend so that the old loop is landed onto the closed
hook and then knocked-over as it descends below the sinker belly.
At this point the under lap occurs before the needles begin their
upward rise and the sinkers move forward to hold down the
fabric.
PROCESS
TRICOT AND RASCHEL FABRICSTRICOT FABRICRASCHEL FABRICFabrics
with fine yarns.Without design or with simple geometric design.
Fabrics having heavy yarns.Intricate designs, open spacing and
surface effect patterns.
THANK YOU
