Card Maintenance and Grinding Systems
category
Card maintenance involves stripping, burnishing, and grinding clothing, with grinding being the most critical operation. Cylinder clothing life is 300,000–600,000 kg throughput with grinding intervals of 80,000–150,000 kg (first grinding) and 80,000–120,000 kg (subsequent). The Rieter IGS (Integrated Grinding System) automates grinding with 400 cycles over clothing lifetime, extending clothing life by over 30%.
Role
Card maintenance directly affects yarn quality—nep content increases continuously between grinding operations, with the lower nep level rising from one interval to the next as teeth are ground to lower heights and softer metal layers are exposed.
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Subtopics
- Grinding Intervals and Nep Level Management First grinding after 80,000–150,000 kg; subsequent grindings every 80,000–120,000 kg for both cylind…
- Grinding Depth and Tooth Point Quality Grinding is performed with the cylinder rotating normally so the grinding roller moves with (not aga…
- IGS-Classic Automatic Cylinder Grinding IGS-classic moves a linear-directed grindstone over cylinder clothing during production, performing …
- IGS-Top Automatic Flat Grinding A grinding brush is permanently installed behind the flat cleaning device. A spring beneath the brus…
- Flat Grinding: On-Card vs External Machine On-card flat grinding installs a grinding roller temporarily on the machine under normal production …
- Grinding Tools: Full-Width Roller vs Traversing Disc Full-width grinding rollers use carborundum abrasive (Al₂O₃) coating on drums driven externally or i…
- Stripping and Burnishing Practices If metallic clothing must be cleaned, use a hand scraper while rotating the cylinder manually (not b…
- Modular Card Design for Easy Maintenance The Rieter C 60 card uses modular design with only the feed chute and main cylinder as fixed parts. …
- Card Settings and Adjustment Principles Settings vary by machine make—manufacturer instructions must be followed. General principles: too na…
- Card Dust Extraction Positions Modern cards provide suction removal at: the infeed region, flat entrance and exit, within the flats…