I. Abnormal Operating Signals
When the equipment exhibits the following phenomena during operation, it indicates that dirt may have accumulated inside the dye bath, affecting system performance:
1. Significantly slower heating or cooling rate: Decreased heat exchange efficiency, possibly due to oligomers, calcium salts, or dye residue adhering to the dye bath wall.
2. Poor dye liquor circulation and uneven temperature distribution: Nozzles or pipes are blocked by fiber debris or clumps, hindering dye bath flow.
3. Increased pump load or abnormal noise: Increased resistance in the circulation system due to scale buildup, increasing motor load.
4. Frequent spotting, excessive foaming, or unusual odors: Long-term residue of organic matter (such as grease or dispersant) has decomposed or reacted.
II. Continuous Dyeing Quality Defects
Uneven dyeing is a direct external manifestation of dye bath contamination. Common problems include:
1. Recurring color spots or streaks: Residual dye or impurities in the dye bath detach, causing secondary contamination.
2. Obvious color difference between left, center, and right: Uneven dye liquor circulation and insufficient contact with the fabric surface indicate severe buildup at the nozzles or on the dyeing vat walls.
3. Frequent issues with overlapping and uneven dyeing: Residual dye liquor in the vat's dead corners is not removed, affecting batch-to-batch cleanliness.
4. Small color spots on the silk surface (irregular dark spots): Undissolved dye or cationic/anionic auxiliaries adhere to the vat and then detach.
Operators should strengthen process monitoring and thoroughly clean the vat before changing colors or dye types to prevent cross-contamination.
III. Perform preventative cleaning according to the production cycle. Even when the equipment is operating normally, periodic cleaning should be followed to prevent problems before they occur:
1. A thorough cleaning must be performed after every 50-100 dyeing batches.
2. A deep cleaning procedure must be performed before changing to lighter or darker colors or different types of dyes (e.g., switching from disperse dyes to reactive dyes).
3. Before long-term shutdown or when restarting, the cylinder should be cleaned and treated with anti-corrosion measures to prevent deposits from solidifying.
