Short staple spinning

"Well carded is half spun."

The revolving flat card is called the heart of the spinning mill. This illustrates the immense significance of carding to the end result and the quality of the yarn.

The concept of carding has existed since 1770, and revolving top cards since 1850. Basically, these cards contained similar elements that still can be found today on high production cards: licker-in, cylinder, revolving tops, stationary flats and doffer. Each element takes an important function in carding.

Groz-Beckert supplies high quality card clothing for different types of cards and areas of application. The selection encompasses metallic card clothing for feed roller, licker-in, cylinder, doffer and stripping rollers. The product range is complemented by revolving tops, stationary flats, stationary flat systems and cleaning fillets.

Feed roller wires

This wire is responsible for uniform feeding of fibers into the card. Coarse interlocked wire is usually used to control thick fiber mats.

Feed roller wire

Licker-in wires

The licker-in's task is to open the fiber tufts and prepare them for the carding process.

Cylinder wires

Together with the revolving flats and stationary carding elements in the pre and post carding zone, the cylinder is responsible for main carding action and fiber separation.

Doffer wires

The doffer wire takes over the fibers from the cylinder. A high rate of fiber transfer should be reached in addition to gentle and uniform web transfer.

Stripping roller wires

The stripping wire strips the web from the doffer wire. Web transfer should be gentle without forming thick places. Only then uniform yarn can be produced.

Stripping roller wire

Revolving tops

Revolving tops consists of flexible wires which, along with the cylinder, take on the main carding action. In addition to carding, tops are designed to collect trash, dust and short fibers.

Stationary flats and stationary flat systems

Stationary flats in the pre and post carding zone, along with the revolving tops, provide for additional carding.

Cleaning fillets

Cleaning fillets are used for cleaning rollers for stripping rollers and for revolving tops.

Raw materials arrive at spinning mills in compressed bales. They are opened and cleaned in the blowroom, which subjects the material to high stress.

The high speeds of the beater rollers can create neps which diminish yarn quality and therefore must be removed by the carding process.

Yet high beater speeds are beneficial to intensive cleaning of the cotton and require a compromise between cleaning efficiency and nep generation in order to achieve good results. It is thus linked to some fundamental considerations:

  1. The wires used must be adapted to the process sequence. The cleaning and opening positions in the blowroom should become finer.
  2. The front angle of the wire is crucial to cleaning efficiency. A larger angle implies more aggressive opening of fibers and hence more intensive cleaning. The use of less aggressive clothing is recommended for finer fibers.
  3. Wear on the wire lowers the intensity of the cleaning and opening process of the raw material. For consistent quality it is therefore important not to use worn wires.

Border wires are necessary to securely fasten the beginning and the end of card wires onto a roller and are embedded in the grooves at the edge of the rollers.

Border wires are removed and replaced when ever grinding of a roller is necessary.

Groz-Beckert also offers special accessories for cleaning, assessment and adjustment work.

The products range from setting and flat gauges, deburring and grinding stones to hand cards and brass brushes.

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