Card Operating Zones and Fibre Processing
category
The card processes material through distinct operating zones: licker-in zone (opening tufts, waste elimination), auxiliary carding devices (carding bars, additional lickers-in), main cylinder/flats zone (individual fibre opening, nep disentangling, short fibre elimination), and doffing/delivery zone (web formation, detaching, sliver formation). Each zone has specific functions, settings, and clothing requirements.
Role
Understanding the function and interaction of each zone is essential for card optimisation. The extremely high production rates of modern cards (up to 220 kg/h) require that each zone performs at peak efficiency with carefully coordinated settings.
Ask AI about this topic
Understand
Apply
Explore
Learn
Watch & Learn
Loading videos…
Subtopics
- Licker-In Zone and Waste Elimination The licker-in is a cast roller (~250 mm diameter) with saw-tooth clothing, operating at 800–2,000 rp…
- Multiple Licker-In Systems Multiple lickers-in (2 or 3) are optionally available from Rieter, Trützschler, and Marzoli. Clothin…
- Carding Bars and Carding Plates Carding aids can be applied at three positions: under the licker-in (plates), between licker-in and …
- Main Cylinder Design and Casing Main cylinders are cast iron or steel, with diameters of 1,280–1,300 mm (Rieter C 60: 814 mm, speed …
- Revolving Flats: Function and Design Flats comprise 80–116 individual bars (Rieter 79) with 27–46 in the carding position, moving on an e…
- Doffing: Fibre Transfer and Web Formation The doffer (600–707 mm diameter, up to 300 m/min) uses carding configuration clothing relative to th…
- Web Detaching and Sliver Formation Modern high-performance cards use a take-off roller instead of the old fly-comb (which cannot exceed…
- TREX System and Post-Flat Cleaning The Rieter TREX system places mote knives close to the cylinder beneath flat covers, with associated…
- Nep Disentangling Mechanisms While nep count increases through the blowroom, the card reduces them to a small fraction. Neps are …
- Short Fibre Elimination by Flats Short fibres can only be eliminated if pressed into and retained in flexible or semi-rigid clothing …
- Fibre Orientation and Blending on the Card Parallelization is achieved on the main cylinder but disappears during web formation between cylinde…