Carding

Carding (including grooming brushes, roll up, sometimes colloquially also scratch falsely, dachas in southern Germany or dätschen ) is used in the process of spinning or in the production of nonwoven fabrics to the first orientation of the non- textile fibers into a pile or fleece. Machines for carding are called clutter or carding, or simply card. The place to be carded, called carding or Karderei.

Must be distinguished from the combing of long fibers and the roughening of tissues by scraping ( Weber carding ) or scratch machines.

Colloquially referred to as card also getting along back of ideas and ideals in human relationships.

Functional Description

The already well-cleaned fiber flocs are submitted to the card as evenly as possible. (Also called the licker ) by means of a feed roller, the flakes pre-dissolved and the spool, one roller of large scale set with tooth-like sets presented. The flakes are covered by the posterior sets of rapidly spinning reel spool and transported in the upper portions of the card. On top of the main cylinder are boards ( top bars ) or small roller pairs, which are also equipped with teeth sets or with flexible check mark. Due to the different direction of rotation, and by the orientation of the sets to each other, the flakes are opened and the fibers are parallelized. The teeth of the sets are aligned with each other (also known as carding ). In addition, is excreted by the high peripheral speed of the main cylinder dirt and dust. The carding, a measure of the extent to which the fibers are parallelised, depends on the following parameters

• The speed difference between drum and flat bars or rolls used
• The density of the sets (the number of teeth per cm ²)
• The distance between drum and flat bars or rolls used

These parameters must be selected according to the type of fiber carding, because some fibers are damaged by too high carding.

If the fibers have traveled half a turn on the reel, they will be taken back from a take-off roll. The pickup roller rotates in the same direction as the drum, but much slower. The fibers are " hung " from the posterior sets of the main cylinder. Since the fibers interlock with each other and adhere poorly to the take-off roll, a wide sliver of the pile or fleece, is deducted from the doffer. He is in a funnel into a round band, the card sliver, formed and stored in loops in a can.

The card sliver is then drawn together with other card slivers in the track (formerly stretching Bank) to compensate for unevenness of the individual slivers. Then the stretched belt can be spun into a yarn through several steps.

History

In the craft and hobby area smaller drum carding are used, which are operated by an electric motor or a hand crank. For hand carding a checkmark lining is mounted on two approximately 10 x 20 cm ² boards with handles. The fiber flocks are placed between the boards and pulled apart the carding. A scratch or Flickkarde is an even smaller Handkarde. It is used individually to loosen the wool, such as when hand spinning.

Field of application

• Cotton and chemical staple fibers up to 60 mm in length are carded on machines with flat bars
• Wool, chemical staple fibers 60 millimeters in length, vicuna, waste fiber blends, jute and Bastfaserwerg be on Carding (also called carding roll ) processes
• Linen and hemp fibers not carded, but resolved only by the panting