I. Uneven Dyeing and Color Patches
Uneven color distribution or patchy appearance on the dyed fabric is a frequent problem.
Insufficient fabric saturation or poor dye liquor circulation leads to uneven dyeing.
Uneven temperature distribution within the dye bath, with significant temperature differences between the ends and the middle.
Inconsistent roller suction rates, or uneven airflow and temperature during drying.
Poor dye dispersion, improper placement, or uneven dye addition.
II. Fabric Blockage and Knotting
The fabric is blocked during circulation, requiring machine shutdown in severe cases.
Excessive pump flow: Too fast a dye liquor flow rate causes the fabric to be pushed to the top of the dye bath, sliding along the outer wall and piling up.
Inappropriate nozzle selection: Using nozzles that are too large for thin fabrics or nozzles that are too small for heavy fabrics leads to poor conveying.
Unbalanced return valve adjustment: Excessive opening of valve III causes fabric lag, disorder, or even knotting.
Improper Seal of the Partition Plate: Dye liquor overflows within the dye bath, forming a "hernia-like blockage," trapping the fabric in the gaps.
III. Dyeing Shutdown Marks: After a sudden equipment shutdown and restart, horizontal stripes of varying shades appear on the fabric surface.
During shutdown, the fabric is trapped between the rollers, resulting in localized continuous absorption of dye or oxidation, creating color variations.
Failure to adjust the dye liquor circulation time after restarting leads to uneven re-dyeing.
IV. Dye Liquor Loss and Leakage: Dye waste, increased costs, and potential environmental pollution.
Aging or damaged seals on the dyeing machine cause dye liquor leakage.
Loose or blocked pipe connections cause abnormal pressure leaks.
Incomplete cleaning of the dye bath results in residue causing crystallization or poor circulation.
V. Control System Malfunctions: Affects dyeing time and temperature accuracy.
Timer or temperature control system failure leads to excessively rapid heating or inaccurate holding time.
Sensor malfunction and feedback data deviation can lead to dyeing that is too dark or too light.
VI. Mechanical Damage: Fabric may develop tears, scratches, or uneven shrinkage.
Excessive tension between the nozzle and the guide roller, especially on thin fabrics, can cause damage from dry-blow dyeing.
Rapid heating or cooling rates can cause uneven thermal shrinkage of the fabric.
Uneven fabric tension distribution within the roller can lead to localized tensile deformation.
