Creep and cage

1. Pre Spinning Processes
(YM-2012)
M Irfan
Department of Textile Engineering
National Textile University Faisalabad
Reference:
The Rieter Manual of Spinning

2. • We will discuss
• Cages
• Cage and condenser
• Hopper feeder
M Irfan, PhD

3. Cages
• Cages are made of woven wires or perforated metal sheets mounted on cast iron rings
• Air flow is induced by fans
• Cages are used for
• Condensing or making sheet of fibers
• For this purpose, speed of cage is kept low compared with cleaning cages to condense the
fibers
• Thickness of fiber sheet depends on cage speed
• Scutcher cage speed is 4-10 rpm
• For removing dust, dirt and other lighter particles from cotton
• For this purpose, speed of cage is kept high to avoid fiber coating and filtering, speed range
50 -70 rpm
M Irfan, PhD
• For filtration of air
• Speed of these cages is very low, all particles of dust, dirt and
trash smaller than perforation size pass through the cage mesh
• After removing heavier particles, air can be sent to fine air filter

4. Condensers
• Condensers convey (transport) the material or cotton from preceding to the next
machine and removes the dust
• Condensers consists of
• A fan
• A cage
• Airtight trunking
• Predetermined pace for air entry
• Air exit
M Irfan, PhD

5. Condenser working
• Fan blows air through pipe creating vacuum in the trunking
• Air can enter through a specific place of the previous machine
• Due to vacuum, air will rush through the pipe at a speed of 10-15 m/sec
• On reaching the cage, air is passed through the cage while fibers are retained on
the cage surface
• Air also carries dust with it and dedusting is performed
• Speed of the cage can be adjusted to avoid coating of fibers on the cage
surface
• Cotton is stripped by striping roller and is dropped for feeding to next machine
• Dirty air is passed towards fan and is sent to the filter
• Condensers of different types and powers are available depending upon
requirement and position in blow room
M Irfan, PhD

6. Distributors
• Distributors are used in blowroom lines to
• Bypass a machine and feed to the next machine
• To supply the material to more than one hopper
feeders
• Production of scutcher is two to three times less than the
opening and cleaning line
• The line is thus divided after last opening and cleaning
machine and production is distributed between two or three
hopper feeders using automatic distributor
M Irfan, PhD

7. Distributors
• A two way distributor can feed two hopper feeders
• When one reserve bin of one hopper feeder is full, a microswitch
in reserve bin closes an electric circuit and energizes a solenoid
for plunger and damper for that hopper outlet is closed
• The cotton will thus flow to the other hopper feeder
• In case both hoppers are filled, electric current to distributor
ceases and supply from opening line is stopped
M Irfan, PhD

8. Feed unit/Feed box/hopper feeder
• The objective of feed box is to provide uniform feed to the following machine
• It ensures optimum cleaning effect
• Usually, a condenser feeds the feed box
• At the bottom of the box, a pair of feed roller, beater and grids may be present
• Feed rollers feed the material to the spiked roller which open the material
and impurities are removed by the grids
• The height of material in the box can be controlled by photo electric cell, limit
switch or a swing door
• Feed box/feed unit/hopper feeder can be installed at any position in blowroom
where uniform feed to any machine is required
M Irfan, PhD

9. M Irfan, PhD