TL;DR
Fiber wraps are usually caused by static buildup in low-humidity conditions, worn wire hooks that fail to release fiber, or a sudden change in feed fiber type. Stop and clear the wrap before damage occurs to the wire.
What you might see
- production stop from sliver break
- fiber roll visible on cylinder surface
- nep and fiber fly increase in the room
- doffer stripper contact with cylinder surface
Likely causes
Low relative humidity below 45% generating static that attracts fiber to roller surfaces
Worn wire clothing hooks that hold fiber instead of releasing it to the next transfer point
Feed fiber too long or too coarse for the wire gauge, causing bridging
Sudden change in fiber type without adjusting the machine settings
Required tools
- Plastic scraper for fiber removal
- Relative humidity meter
- Wire clothing inspection magnifier
Safety first
- Fiber dust on carding machines is a fire hazard. Keep ignition sources away and maintain a housekeeping schedule for fiber accumulation under the machine.
- A fiber wrap that contacts the fixed flats generates heat. Treat it as a potential fire event and follow the site fire response procedure.
- Lock out the main drive before reaching inside the card for any cleaning or inspection.
Procedure
- 1
Stop the machine immediately on detecting a wrap. Do not allow the wrap to thicken and contact the fixed flats.
Warning: A thick fiber wrap in contact with the rotating cylinder is a friction-ignition fire risk. Shut down immediately if smoke is detected. - 2
Lock out the main drive.
- 3
Remove the wrap carefully using a plastic scraper or blunt pick. Do not use a metal tool on the wire clothing surface.[1]
- 4
Check the machine room relative humidity. If it is below 45%, increase the humidification level to reduce static charge.
- 5
Inspect the wire clothing hooks at the wrap location for damage or heavy contamination with short fiber. Replace the clothing section if significant damage is found.
- 6
Verify the feed fiber length and count are within the wire gauge specification for the TC 19i. Adjust the opening line settings if a different fiber type was introduced.[1]
- 7
Restart at slow speed and monitor for 5 minutes before returning to production speed.
Sources
Trützschler Trützschler TC 19i Carding Machine general technical documentation, Trützschler
Trutzschler TC 19i carding machine general fiber wrap response and humidity control (general)
More guides for Trützschler Trützschler TC 19i
How to fix card sliver unevenness on a Trutzschler TC 19i carding machine
Sliver unevenness is most often a flat gauge drift, a wire clothing wear, or a doffer speed change. Check the flat-to-cylinder gauge and wire condition before adjusting the autoleveler.
How to fix flat strip loss or alignment fault on a Trutzschler TC 19i
Flat strip loss or flat alignment faults are usually a broken flat chain link, a worn flat guide rail, or flat tip damage. Inspect the flat chain and guide rail before replacing individual strips.
Stop fixing the same fault twice.
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