An_Overview_of_Carding_Cylinder.pdf

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An Overview of Carding Cylinder

An Overview of Carding Cylinder

Bhavdip Paldiya

Dept. of Textile Technology

Sarvajanik College of Engineering & Technology, Surat, India

Cell:+91 9662020909

Email:[email protected]

What is Cylinder:

The carding cylinder is usually manufactured from cast iron, but is now sometimes made of steel. Most cylinders

have a diameter of 1280-1300 mm and rotate at speeds between 250 and 500 rpm.

Specification of Cylinder:

1. DIAMETER : 50(120 mm)

2. SPEED : 250-500 rpm

3. WIRE POINT PER INCH: 550-650

4. SURFACE SPEED: 1000ft/min.

5. TOTAL WIRE POINT: 30lac

6. WIRE POINT DIRECTION: Anti clock

Objectives of Cylinder:

1. Back plate:

To hold the fibre.

To prevent the development of undesirable air current.

2. Top feather edge sheet:It controls the wt. & thickness of the flat strips.

3. Cylinder stripping door:This door is used to strip the wire point of cylinder.

4. Bottom sheet:

To hold the fibre.

To prevent the development of undesirable air current.

5. Cylinder undercasing:

Remove dust.

To maintain constant airflow.

Types of Cylinder:

There are two types of cylinder.

1. Single cylinder

2. Double cylinder

1. Single cylinder carding machine:
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Single cylinder carding machine

Specifications

Cylinder Dia. 700mm

Output: 100-250kgs/h

Power: 18.5kw

Application

This machine can open various baled fiber,and send to next procedure via fan.

It opens fiber with pin plate,high production and good quality

A brief feature of single cylinder:

Single Cylinder Carding Machine, up to 1.5 meters in diameter and up to 2.5 meters in width are produced

as normal standard.

Cover all types of fiber from very fine to very coarse fiber deniers; fiber lengths up to 120 mm can be

processed. Both synthetic and natural fibers of all types can be processed.

Cylinders up to 1.5 meters in diameter and up to 2.5 meters in width are produced as normal standard.

Carding machines outside this size range can be discussed dependent on ard main cylinders are balanced

to a surface speed of 1500 meters / per min.

All types of carding machines both single and double doffers can be fitted with randomizer rollers or not

dependent on customers needs.

Card wires can be supplied as surface wound or interlocking as required.

Card capacity is depending upon card type, fiber denier, types of fiber but can be excess of 800 kgs / per

hour.


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Other details and variables dependent on customers needs can be discussed with our technical staff.

clients individual requirements.

2. Double cylinder carding machine:

Double cylinder carding machine

SPECIFICATION :

Middle cylinder diameter: 850mm,635mm

Big cylinder diameter:1230mm,1020mm

Power:35KW

Application:

Double doffer used for carding and mixing opened chemical fiber and blending material.

New type of double carding m/c

Specifications

Product Name - double cylinder carding machine

Working width: 1800mm 2000mm 2200mm 2500mm

Capacity: 150kg/h 200kg/h 300kg/h

Dia. of cylinder: 1230mm

Speed: 20 - 50m/min

Application:

Various kinds of fiber such as polyester,viscose,nylon,PP,fiberglas,etc

Cylinder Speed:

1. Higher cylinder speed helps fibre transfer. Higher the production, higher should be the cylinder speed.

2. Higher cylinder speed improves carding action, thereby imperfections are reduced

Cylinder Wire Selection:

Cylinder wire selection is very important, it depends upon cylinder speed, the raw material to be processed and

the production rate.


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Cylinder Construction

The following characteristics of cylinder wire should be considered.

1. Wire angle

2. Tooth depth

3. Wire population

4. Rib thickness

5. Tooth profile

6. Tooth pitch

7. Tooth point

8. Overall wire height

Cylinder Wire Maintenance:

For a modern cylinder wire of 2mm height, grinding with the normal grinding stone is not recommended. It

is better to use TSG grinder to grind the wire every 2nd or 3rd month, so that the sharpness of the wire is

always maintained.

TSG grinder does not grind the wire, therefore if the wire is worn out very badly the quality improvement

using this grinding machine will be nil. Frequent grindings are recommended. If TSG grinder is not

available, it is better not to grind 2mm wires.

The number of traverse should increase depending upon the life of the wire. The number of traverse for

successive grindings should be like this 3, 5, 10, 17 etc. Anyway the best method is to confirm with the

microscope. If the grinding is not sufficient, the number of traverse should be increased.

Cylinder Construction in Modern carding

The cylinders of modern carding machinesare almost solely welded constructions (Fig. ). They consist of the

shell reeled of metal sheet welded along its edges, bottoms with hubs stiffened with ribs, the shaft and thereinforcement rings. Such constructions are used by leading carding machine manufacturers, and particular

solutions are different as to the side hubs construction and reinforcement rings Loads acting on the main

cylinder of carding machine

The loads acting on the cylinder

result from:

The influence of fiFIBER on the

teeth of card wire during the

carding process; the forces are

small and are omitted when

calculating deflection of the

cylinder shell,

The construction deadweight

and the centrifugal force; their

influence on the cylinder

deflection may also be

neglected due to small

rotational speed of the cylinder

(circa 100200rpm),

Reeling at tension of the

metallic card wire.

Reeling at tension S and the reeling pitch t of the card wire on the cylinder with the radius R (Fig. 3) exerts

pressure on the cylinder shell directed radially inward with the value of
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Tension forces acting on the metallic card wire coils

Setting between cylinder and doffer

Radial pressure = pr

Force =F

Surface force =px

Setting between cylinder and

doffer

If the setting between cylinder and

dofferis very close, the wires willget polished and this will affect the

fibre transfer. If the setting is too

wide, the fiFIBER will not be

transferred to doffer from the

cylinder, hence cylinder will get

loaded. While processing synthetic

fiber cylinder loading will badly

affect the yarn quality. Moreover, it

is difficult to improve the wire

condition if the loading is severe.

The only solution would be to

change the wire. Therefore enough

care should be taken while

processing synthetic fiber. The

setting between cylinder and flat

The most critical setting in a

carding machine is between

cylinder and flat tops. While processing cotton, it can

be as close as 0.175 mm provided the mechanical

accuracy of flat tops is good.

Closer the setting between cylinder and flats, better

the yarn quality. Neps are directly affected by this

setting. Of course, very close setting increase the flat

waste. For processing cotton the setting can be 0.25,

0.2, 0.2, 0.2, 0.2mm. For synthetic fiber it can be 0.3,

0.25, 0.25, 0.25, 0.25mm.

The setting between cylinder and flats can be as

close as possible.

Heal and Toe Arrangement

The top half of the cylinder is surrounded by a series of

flats. The flats are also covered with wire teeth, the points

of which oppose & are set close to the wire on the

cylinder. The setting between flats & cylinder is arranged that there is a wide3r setting at the back or trailing edge

on which cotton first reaches for being carded & closer setting at the leading edge where the cotton leaves the flat.

This arrangement is generally termed as Heal & Toe arrangement.
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The setting between cylinder and flat

Heal & Toe arrangement

Importance: The object of this type arrangement is to effect a gradual opening & carding of the fibers at each flat.

An_Overview_of_Carding_Cylinder.pdf

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