Lycra Yarn – Pretreatment in Package dyeing machine:

Machine Circulation Cycle Settings:

Cheese winding: on plastic cones or cheeses.

Cheese Weight : Not more than 500 grams/cheese

• DEMINERALIZATION:
  
  
  
  • Recipe:
    
    
    
    • Kierlon Jet B Conc = 0.05%
    
    
    • Lufibrol MFD = 0.05%
      
      
      
      • @ 50°C for 2 cycles
      
      
      • This is done to remove the unwanted mineral contents from the fiber.
      
      
• Hot Wash = 1 cycle @ 50°C


• Cold Wash = 1 cycle


• BLEACHING:
  
  
  
  • Recipe:
    
    
    
    • Soda Ash = 2.0%
    
    
    • Stabilizer = 0.5%
    
    
    • Lissopol D paste = 0.5%
    
    
    • Hydrogen Peroxide(50%) = 2.0%
      
      
      
      • @ 65° to 70°C for 45 to 60 minutes.
      
      
      • Set the bath with chemicals other than H2O2.
      
      
      • Raise temperature @ 1.5°C/minute
      
      
      • Hot Wash = 1 cycle @ 50°C
      
      
      
      
• Peroxide Killer Treatment:
  
  
  
  • Recipe:
    
    
    
    • Organic Peroxide killer = 0.25%
    
    
    • Acetic acid = 1.5 g/l
      
      
      
      • @ 50°C for 1 cycle
      
      
• Drain, Cold wash


• Start Dyeing.

Note:

1. Bleaching temperature should not go beyond 65 to 70°C

2. Cheese weight = 500 grams and less is safer.

3. If you want to use regular cheese weights of 800 to 1000 grams, then the cheeses have to be conditioned in the autoclave with moist steam at 100°C for 30 minutes, repeatedly, so that a stable shrinkage percentage of yarn is reached. The linear shrinkage % should be 20 to 25%.