I. Common Faults and Troubleshooting
1. Weft Skew: The weft threads of the fabric are skewed.
Causes: Inconsistent pressure when feeding the fabric into the dyeing vat; excessive water pressure during boiling dyeing.
Prevention: Feed the fabric into the vat evenly; do not use excessively high water pressure during dyeing.
2. Loose Board Marks: The fabric surface shows saw marks resembling tree rings.
Causes: Excessive tension and temperature during fabric winding.
Prevention: Do not use excessive tension when winding the fabric; use cold water for winding.
3. Color Bars: Horizontal bars of varying shades appear on the fabric surface.
Causes: Mechanical malfunction causing the machine to stop.
Prevention: Carefully check the operation of all machine parts before restarting.
4. Color Difference: Color differences exist between rolls.
Causes: Inconsistent process parameter control, uneven chemical mixing, uneven equipment temperature field, etc.
Prevention methods: Strictly control process parameters, ensure uniform chemical mixing, and regularly calibrate the temperature control system.
5. Uneven Color at Both Ends: The silk fabric exhibits uneven color at both ends.
Causes: Unclean silk guide; failure to add dyes according to their properties during dyeing; lack of a cover when dyeing certain dyes, etc.
Prevention methods: Keep the silk guide clean; add dyes according to their properties; use a cover for volatile dyes.
6. Wrinkles: Wrinkles appear in the warp direction.
Causes: Uneven seam ends, uneven and flat rolling; inconsistent width of the raw silk; excessive water jet impact; excessive tension; non-level tensioning frame; excessive yarn knots on the stainless steel rollers at the bottom of the dyeing cylinder, etc.
Prevention methods: Even seam ends; align the width; avoid excessive boiling steam; adjust tension appropriately; keep the tensioning frame level; keep the dyeing cylinder clean.
7. Color Variation: The color varies in depth, appearing as irregular patches.
Causes: Insufficient dyeing water level; oil stains on the fabric surface; incomplete dye dissolution, etc.
Prevention Methods: Control the dyeing water level; strengthen pre-treatment to remove oil stains; ensure complete dye dissolution.
II. General Principles for Troubleshooting
1. Prevention First: Regularly maintain and service the equipment, checking the guide rollers, winding rollers, tension devices, etc., for proper functioning.
2. Standardized Operation: Strictly follow the operating procedures for chemical mixing, fabric loading, and setting process parameters.
3. Timely Troubleshooting: In case of a malfunction, immediately stop the machine for inspection and address the specific causes based on the above analysis.
4. Record and Analysis: Record the symptoms, causes, and solutions for each malfunction for future analysis and prevention.
III. Safety and Maintenance
1. Safety First: When operating high-temperature and high-pressure equipment, always adhere to safety procedures to prevent burns, mechanical injuries, etc.
2. Regular Maintenance: Develop and implement a regular maintenance plan, including cleaning the dyeing vat, inspecting seals, and replacing worn parts.
3. Professional Repair: For complex mechanical or electrical faults, it is recommended to contact the equipment manufacturer or a professional repair technician.
