Before studying about lap former machine lets discuss about
whats lap and lapping?Lap A sheet of fiber or fabric wrapped around
a core.A general term used to designate wide sheets of loosely
matted cotton, formed on such textile machines as the breaker,
picker, finisher picker, ribbon lapper, and sliver lapper.It is
basically the output of blow room or draw frame machine and also
the main thing it is input to the carding machine.
Lap feed in carding machine
Lapping Lappingis amachiningprocess, in which two surfaces are
rubbed together with anabrasivebetween them, by hand movement or by
way of a machine.This can take two forms. The first type of lapping
(traditionally calledgrinding), typically involves rubbing a
brittle material such asglassagainst a surface such asironor glass
itself (also known as the "lap" or grinding tool) with an abrasive
such asaluminum oxide,jewelers rouge,optician's rouge,emery,silicon
carbide,diamond, etc., in between them. This produces
microscopicconchoidal fracturesas the abrasive rolls about between
the two surfaces and removes material from both.The other form of
lapping involves a softer material such aspitchor aceramicfor the
lap, which is "charged" with the abrasive. The lap is then used to
cut a harder materialthe work piece. The abrasive embeds within the
softer material which holds it and permits it to score across and
cut the harder material. Taken to a finer limit, this will produce
a polished surface such as with a polishing cloth on an automobile,
or a polishing cloth or polishing pitch upon glass or steel.Taken
to the ultimate limit, with the aid of accurateinterferometryand
specialized polishing machines or skilled hand polishing,lens
makerscan produce surfaces that are flat to better than 30
nanometers. This is one twentieth of thewavelengthof light from the
commonly used 632.8nm helium neon laser light source. Surfaces this
flat can be molecularly bonded (optically contacted) by bringing
them together under the right conditions. (This is not the same as
the wringing effect ofJohansson blocks, although it is
similar).
Lap former Machine The lap former has, furthermore, the task of
forming the interfacing or lap, which is employed to feed
thecombing machine. The lap is obtained by doubling a certain
number of slivers (from16 to 32) previously subject to a drawing
passage. The slivers are fed side by side, passing, through rollers
and stop motion. The slivers enter the drafting section and then
calendar ' section to produce a compact lap. Finally the lap is
wound on to bobbin. In the lap former, the material under goes a
light draft of around 1.5 to 2 times one a drawing aggregate of the
type 2 on top of 3 cylinders.
Drawing Machines where slivers from carding is Drawn in to, so
as to make the fibers parallel and are fed to a similar machine to
get a better parallelization which goes to the next department. In
Lap former machine, slivers are fed to form a lap of 20 inches wide
condensed with a slight draft and weighing as per set length. The
machine run smoothly so as not to disturb the fibers which undergo
combing at the comber machines. One such Lap former is sufficient
to feed 8 comber machines. The machine is equipped with sliver
break stop motion. Whenever the sliver in any of the cans happens
the machine stops and a red light goes up to indicate the operator
that it has stopped. These Laps are wound to fixed lengths and is
cut at that length and the machine ejects it to a stand and starts
automatically.
Lap former process In Lap-former machine, slivers are fed to
form a lap of 20 inches wide condensed with a slight draft and
weighing as per set length. The machine run smoothly so as not to
disturb the fibers which undergo combing at the comber machines.
One such Lap former is sufficient to feed 8 comber machines.
Features of lap former Machine Delivery speed up to 120 mts/min
Batt weight up to 80 gms/mt Pro-In control for lap build-up 4/4
spring loaded drafting system Integral top roller release Variable
top roller loading Modular construction Complete belt drive Auto
spool changer Positively driven creelLap transport through lap
trolley
