Card Feed Systems and Chute Design
category
Card feed involves pneumatic tuft delivery through one-piece chutes (simple, economical) or two-piece chutes with opening systems (more complex but delivering more even, better-opened material). The upper chute half serves as a reserve chamber separating material from air; the lower portion holds constant material quantity compressed evenly by controlled air or vibrating plates to form an ideal feedstock of 500–900 ktex.
Role
The card is the first machine to deliver a cohesive intermediate product, and every irregularity in the feedstock is transmitted into the sliver. Faults should be prevented rather than corrected, making even, consistent feed essential for high-quality carding.
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Subtopics
- One-Piece Chute Systems In the one-piece chute, a column of material of somewhat variable height over time is pushed forward…
- Two-Piece Chute Systems with Opening Roller The two-piece chute separates reserve storage (upper half with electronic pressure regulation) from …
- Conventional Feed Device (Feed Plate and Roller) The conventional feed assembly comprises a stationary feed plate with a deflector nose (b) and guide…
- Unidirectional Feed (Same Direction as Licker-In) Rieter's unidirectional feed system reverses the conventional arrangement: the feed roller is below …
- Fine Cleaning Integrated in Card Chute The existing opening position in the card chute is supplemented with a mote knife, creating a card c…
- Lap Feed vs Tuft Feed Comparison Lap feed from scutchers provided less problematic evenness since each lap was checked for accuracy o…
- Chute Compression and Material Height Control When a card ceases operation, all compression of material in the chute must be terminated (whether b…
- Cross-Machine Feed Distribution Tufts must be transported pneumatically from a distributor unit into chutes of several cards, with o…
- Scutcher and Lap Formation The scutcher forms a lap for supplying material to cards, with modern versions being exclusively sin…
- Storage and Feeding Machines The Rieter A 78 UNIstore serves as storage, dedusting, and feeder machine, providing intermediate st…