Carding machine - Operating Principle of Carding Machine

The portion of the sheet projecting from the feed roller must be combed through and opened into tufts by the licker-in.. The tufts themselves are carried along with the main cylinder and

Prepared By : Mazadul Hasan sheshir ID: 2010000400008

13th Batch (session 2009-2013) Department : Wet Processing Technology Email: mazadulhasan@yahoo.com

Blog : www Textilelab.blogspot.com (visit)

Southeast University

Department Of Textile Engineering I/A 251,252 Tejgaon Dhaka Bangladesh

Prepared By :

Total Textile Process at a Glance

Carding Machine

In modern installations, raw material is supplied via pipe ducting into the feed chute (of different designs) (2) of the card An evenly compressed batt of about 500 - 900 ktex is formed in the chute A transport roller (3) forwards this batt to the feed arrangement (4)

This consists of a feed roller and a feeder plate designed to push the sheet of fiber slowly into the operating range of the licker-in (5) while maintaining optimal clamping

The portion of the sheet projecting from the feed roller must be combed through and

opened into tufts by the licker-in These tufts are passed over grid equipment (6) and

transferred to the main cylinder (8)

In moving past mote knives, grids, carding segments (6), etc., the material loses the

majority of its impurities Suction ducts (7) carry away the waste The tufts themselves are carried along with the main cylinder and opened up into individual fibers between the cylinder and the flats in the actual carding process

Operating Principle of carding machine

The flats (10) comprise 80 - 116 individual carding bars combined into a belt

moving on an endless path Nowadays some 30 - 46 (modern cards about 27) of the flats are located in the carding position relative to the main cylinder; the rest are on the return run

During this return, a cleaning unit (11) strips fibers, neps and foreign matter from the bars Fixed carding bars (9) and (12) are designed to assist the operation of the card Grids or cover plates (13) enclose the underside of the main cylinder After the carding operation has been completed, the main cylinder carries along the fibers that are loose and lie parallel without hooks

However, in this condition the fibers do not form a transportable intermediate

product An additional cylinder, the doffer (14), is required for this purpose The doffer combines the fibers into a web because of its substantially lower peripheral speed relative to the main cylinder

A stripping device (15) draws the web from the doffer After calendar rolls (16)

have compressed the sliver to some extent, the coiler (18) deposits it in cans (17) The working rollers, cylinder and flats are provided with clothing, which becomes worn during fiber processing, and these parts must be reground at regular intervals

Cross Section of Carding Machine

Path Diagram of Carding Machine

Schematic Diagram of a Carding Machine

This is a cast roller with a diameter usually of around 250 mm Saw-tooth clothing is applied to it Beneath the licker-in there is an enclosure of grid elements or carding segments; above

it is a protective casing of sheet metal The purpose of the licker-in is to pluck finely opened tufts out of the feed batt, lead them over the dirt-eliminating

parts under the roller and then deliver them to the main cylinder In high-

performance cards, rotation speeds are in the range of 800 - 2 000 rpm for cotton and about 600 rpm for

synthetics

Carding Bar

The cylinder is usually manufactured

from cast iron, but is now sometimes

made of steel Most cylinders have

a diameter of 1 280 - 1 300 mm

(Rieter C 60 card 814 mm, speed up

to 900 rpm) and rotate at speeds

between 250 and 500 (to 600) rpm

The roundness tolerance must be

maintained within extremely tight

limits – the narrowest setting distance

(between the cylinder and the doffer)

is only about 0.1 mm The cylinder is

generally supported in roller bearings

Clothing configuration between main cylinder and doffer

Flat

• The cylinder is followed by the doffer,

which is designed to take the individual fibers from the cylinder and condense

them to a web The doffer is mostly

formed as a cast iron (or steel) drum with

a diameter of about 600 - 707 mm

(680 mm on Rieter machines) It is fitted with metallic clothing and runs at speeds

up to about 300 m/min

Detaching Apparatus

Web detaching using detaching rollers and transverse belts

Machine Drive

A, main drive for the cylinder, licker-in and flats;

B, drive for the infeed;

C, drive for the delivery, i.e doffer, detaching rollers and coiler;

D, drive for the cleaning roller of the detaching roller;

E, drive for the cleaning roller of the flats via the stripping roller;

F, fan

Layout of Rieter Carding machine

Layout of Trutzschlar Carding machine

Some Popular Spinning Machine manufacturing

Company

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