Nonwovens

The nonwovens industry uses roller cards to process staple fibers into nonwovens. The nonwovens fabrics manufactured are used in the traditional textile industry as well as in very different technical areas, from the automobile industry and geotextiles to the hygiene sector and medical industry.

Optimum carding results in the nonwovens industry ensure that each fiber contributes to the desired quality of the nonwoven fabric and that the full potential of the raw material is exhausted.

The composition and choice of card clothing for roller cards thus depends on the end product, the raw material and the carding force required. The geometry of the card clothing teeth is of crucial importance.

For nonwovens, Groz-Beckert supplies card clothing for different applications and also services such as product consulting and recommendations.

Feed roller wires

This card clothing is responsible for uniform feeding of fibers into the card. Coarse and heavy card clothing is generally used because it can control thick fiber mats.

Licker-in wires

Using licker-in wires, fiber tufts are separated from the compressed fiber mat and fed into the carding process.

Transfer roller wires

Transfer roller wires usually have a front angle of 60°. This ensures that the fibers are completely transferred from the upstream roller to the downstream roller.

Cylinder wires

Since it comes into contact with most of the adjacent rollers, cylinder card clothing is considered the heart of every card. The cylinder wire selected is oriented especially to fiber type and fiber fineness.

Worker and doffer wires

Worker wires open the fiber tufts down to the individual fibers and mix the fiber components. Doffer wires are responsible for uniform distribution of fibers in the nonwovens.

Stripper wires

High throughput requires high worker and stripper speeds. The geometry of stripper wires has thus evolved toward worker and doffer wire design.

Condenser wires

A particular demand on condenser wires is the finishing quality. The condensed fibers must be controlled and completely transferred to the downstream roller.

Take-off roller wires

Take-off wires gently transfer fibers from the card to the downstream production line.

In the nonwovens industry, fiber raw material is delivered in bales. During fiber preparation the raw material must be opened and mixed, which brings high stress on the fibers.

This often results in short fibers that subsequently diminish the quality of the nonwovens, and calls for a compromise between opening performance and fiber damage 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 opening positions in fiber preparation are adapted to the continuous opening process and equipped with gradually finer wires, whereby the front angle is also adapted to the level of opening.
  1. Worn card clothing is less efficient in opening the raw material. For consistent quality it is therefore important to replace worn card clothing in a timely way. This is the only way to ensure consistent quality.

Fillets

Fancy rollers are responsible to lift fibers to the cylinder surface.

Fillet for fancy roller

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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