Card clothing , card clothing wire, card clothing specification, card clothing wire for textile machine,

MACHINE ELEMENTS

Card clothing

 The card clothing is supplied in sets depending upon the applications.

 The following lists some of the characteristics of typical card clothing.

 

Clothing – Technical data
Fibers		Points / sq. inch
Fine cotton	Cylinder wire	800 to 1000
Man-made	Cylinder wire	450 to 650
Coarse cotton	Cylinder wire	600 to 800
Fine cotton	Flat clothing	500
Man-made	Flat clothing	270
Coarse cotton	Flat clothing	350 to 400
Universal wire	Doffer	340
Special wire for fine fibers	Doffer	400
	Licker-in Clothing Wire wound or Pins
Cotton, general	10 degrees positive	36
Synthetics and rayon	0 to 5 degrees positive	27

 

Additional details about tooth shapes and side grinding is available from the technical department or the clothing suppliers.

 

When the card is to be used for different fibers, the clothing has to be selected as a compromise that will perform satisfactorily on each fiber type. 

Clothing sets

 The clothing, with its wide scope of use is divided into five spheres of applications.  

•   Carded rotor yarns, 
•    Carded ring yarns and combed rotor yarns, 
•    Combed ring-spun yarns, 
•   Man-made fibers of 1 to 2 dtex 
•    Blends of cotton and MMF of 1 to 2 dtex. (Also as swing cards)

 

Clothing kits have been developed for the Rieter cards in conjunction with the clothing suppliers ECC, Graf and Hollingsworth of Germany. 

The specifications of the kits are reviewed periodically and upgraded when necessary. 

The exact details are issued with the machine specifications and can be checked by contacting the service or technical department.

 

   Clothing – grinding (When IGS is not used)

 The primary indication that the clothing needs to be ground is that the nep count in the sliver has reached the upper tolerable limit. 

The wire condition should be visually checked using a magnifying glass of 30 to 50 powers. The tips of worn clothing appear rounded with no carding leading edge. 

It is then necessary to grind the clothing until a clean sharp leading edge is visible over the whole of the clothing. The grinding should be performed carefully and in small steps to prevent the formation of “burrs on the front edge of the teeth. 

The following is taken from the machine manual as a guide.

 

a)        Is a correctly ground tooth with a sharp, clean carding edge (1). There is a good tooth shape and fine grinding marks on the surface of the tooth.

 

The clothing operates at its optimum.

 

b)   The worn radius (2) on the front edge has been ground away only partially. A sharp edge (1) is still lacking.

 

The fine grinding marks do not extend to the edge, the radius

 

(2) is still bright. Grind additionally until edge is sharp. Judging the Cylinder Clothing Tips after Grinding 

c)    Tooth with a burr on the front edge (3). This condition must be avoided at all cost!

Licker-in    Licker-in mote knives and carding elements The first tuft opening action takes place at the feeding point. The matt is firmly held between the feed plate and the feed roll and the licker-in separates fibers and tufts from the matt. The intensity of this action is dependent upon the speed of the licker-in and the setting of the feed plate. If the feed plate is set too close there will be fiber damage. As the fibers are fed, they are instantaneously accelerated to the surface speed of the licker-in, which is in the region of 900 m/min. (licker-in circumference x rpm. i.e. diameter – 250 mm x • x 1100 rpm = 864 m/min or 14.4 m/sec) If the matt feed rate were 1.6 m/min, the draft at the feeding zone would be 540:1 Advantages of the Rieter card in the feed and licker-in zone are: The unidirectional feed arrangement which transfers the fibers to the licker-in without a rapid change of direction which is the case with the convention feed roll / feed plate arrangement.    The variety of arrangements of mote knives and carding segments around the licker-in to progressively open the fiber tufts before they reach the cylinder.   The licker-in region is designed to remove trash and vegetable matter. Approximately 90% of the card waste is removed in the licker-in zone. This waste is high in trash content and is not re-usable. Preferably, it should not be mixed with the remainder of the card waste that is of higher fiber content and can be recycled for specific end uses. The new licker-in assembly consists of adjustment free profiles with a new patented mounting. Two carding elements are fastened to each profile. With this innovation there is no need to adjust the carding element / licker-in distance.    Standard arrangement:       Enlarged extraction slot:       Basic version for man-made fibers.    Licker-in / cylinder fiber transfer

Man-made fibers and blends	Cylinder / licker-in ratio 2.05 (“slow” licker-in speed)
Cotton	Cylinder / licker-in ratio 1.78 (“medium” licker-in speed)
Cotton with a high trash content	Cylinder / licker-in ratio 1.55 (“fast” licker in speed and standard for the C 51 Hi•Per•Card)

This reduces the assembly time when changing the licker-in and guarantees optimum running conditions.

1.  Licker-in

2.  Adjustable knife

3.  Carding element

3a.Guide element

4.  Combi-profile

  

Additionally chrome-plated flat for cotton (man-made fibers, swing.

 

1 .Licker-in

2 .Knife

3. Carding element

 

The guide element can also be used and then there will be virtually zero licker-in waste

In the above illustrations of the C51 Hi•Per•Card, there are two knives and two profiles shown in each case. It is also normal to use a single knife and one profile when carding short clean fibers such as cotton noil.

Additionally, for man-made fibers it is possible to use a single profile with either a single knife or a “feeding aid” can be used to replace the knife and eliminate waste being removed at the licker-in.

The degree of waste removal and cleaning at the licker-in is influenced by:

·         the setting of the knife relative to the licker-in wire,

·         the size of the trash removal opening immediately before the knife,

·         the number of knives,

·         speed of the licker-in: higher speeds increase waste removal, but may also increase fiber damage.

·         with heavier matt weights the feeding speed is lower and the fiber is held for a longer time in the opening zone. This increases the opening action of the licker-in and slightly increases the trash removal but there is also a tendency to damage fibers.

The material on the licker-in is transferred to the cylinder.

At the transfer zone the licker-in wire is in the doffing position relative to the cylinder, which has a higher surface speed. The cylinder is traveling in the same direction as the licker-in and therefore the opening effect is small.

Generally, the ratio of licker-in surface speed to cylinder surface speed should be about 1:2. Changing the licker in speed to maximize trash removal alters this ratio. Care should be taken to ensure that increasing the licker-in speed to remove more trash does not compromise the overall carding performance.

The licker-in speed is linked to the cylinder speed but there are three ratio changes that can be made and the recommendations are:

Immediately after the cylinder takes the fibers they are pressed into the wire by the cylinder cover plate. The plate has to be set relative to the cylinder wire to ensure that the wire securely transports the fibers.