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Dyeing of pet wool blends
Dyeing of pet wool blends
Dyeing of pet wool blends
Dyeing of pet wool blends
Dyeing of pet wool blends
Dyeing of pet wool blends
Dyeing of pet wool blends
Dyeing of pet wool blends
Dyeing of pet wool blends
Dyeing of pet wool blends
Dyeing of pet wool blends
Dyeing of pet wool blends
Dyeing of pet wool blends
Dyeing of pet wool blends
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Dyeing of pet wool blends

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  • 1. Minimisation of damage to wool
    • The advantages of high temperature dyeing above 110 0 C are
      • Fast deep shades
      • Shorter leveling time
      • Better levelling
      • Less staining of wool
    • Disadvantages
      • Wool degradation –reduction in strength, elongation, abrasion resistance, yellowing
  • 2.
    • Therefore, to protect the wool component during high temperature dyeing,
      • Most common agent HCHO (5% owf) allows dyeing at
        • 105 0 C for 4 hrs
        • 110 0 C for 3 hrs
        • 115 0 C for2 hrs
        • 120 0 C for 1 hr
      • pH: 3.5-4.5
  • 3. Recommended dyeing times
    • 100 0 C for 120-150 min with carrier, no formaldehyde
    • 106 0 C ,90 –120 min with carrier and without formaldahyde
    • 110 -115 0 C, 60 –90 min, reduced amount of carrier, formaldehyde necessary
    • 120 0 C, 20-30 min (not >40 min), carrier optional, formaldehyde necessary
    • High temperature dyeing is recommended for deep shades –yellowing is not so critical
  • 4. Precautions for formaldehyde use
      • Shades of some dyes are affected -careful dye selection
      • HCHO vapours are potentially hazardous -restricted use by health and safety considerations
    • Therefore, agents which will release HCHO during dyeing (in-situ release) are preferred. E.g DMEU -HCHO release above 0 0 C
  • 5. Dyeing methods:
    • One bath dyeing method with disperse and acid or metal complex dyes
    • Dye selection:
      • Disperse dye –low energy ->minimum staining of wool –easily removed by after wash
      • Acid or metal complex –not so critical
  • 6. General dyeing recipe
    • X% disperse dye
    • Y% acid/metal complex dye
    • Z% carrier
    • 1 –2% dispersing agent
    • 5 -10% glauber’s salt
    • pH :4.5 –5.5 with acetic acid
  • 7. Dyeing procedure
    • Set bath with auxuliaries
    • Preheat 10 –20 min at 50 -70 0 C
    • Add disperse and dissolved acid dye
    • Treat for 10 min
    • Raise temperature to boil or 103-106 0 C 30-45 min
    • Dye for 1½-2hrs depending on depth of shade
    • Cool, cold and hot rinse –shading 80 -100 0 C
  • 8. One-bath dyeing
    • Improve dye exhaustion
    • Minimise wool staining
    • Wool protecting agent is necessary
    • Recipe:
      • X% disperse dye
      • Y% acid / metal complex dye
      • 3-5% HCHO (30%)
      • 1-2% dispersing agent , pH : 5 -6 with HAC’
  • 9.
    • Pretreat with auxiliary at 50-60 0 C
    • Add disperse and acid dyes
    • Treat for 10 min
    • Raise temperature to 110 0 C/120 0 C in 45 min
    • Dye for 30 –60 min
  • 10. After treatment
    • Staining of wool with disperse dyes cannot be avoided even if the process is carried out with most siutable dyes under the most favourable conditions
    • Disperse staining on wool –poor fastness –must be removed completely
    • One-bath method –reduction clear is not possible
    • After wash: 1-2 gpl non-ionic detergent, pH 5-6 with HAC’, 20-30 min at 60 0 C, good rinse
    • With deep shades, repeat the above process
  • 11. Two bath process
    • Used for deep shades -particularly navy and black
    • Dye polyester component with
      • X % disperse dye
      • Y% carrier
      • 1 –2% dispersing agent
      • pH 5-6 with HAC’
      • Maximum temperature :103 -106 0 C or boil
      • Cold rinse
  • 12. Reduction clearing:
      • 3 gpl hydrose
      • 0.5- 1 ml/l ammonia(25%)
      • 0.5-1 gpl non-ionic emulsifying agent
      • For 30 min at 45 -50 0 C
    • Good rinse, acidify with HAC’
    • Dyeing of wool component
  • 13. Thermosol dyeing
    • Not common
    • Can be used for coloration of PET component only
    • Wool component is dyed seperately ( detail sin page 256-257)
    • Dry heat treatment:
      • 190 -200 0 C for 45 –60 secs
      • Not harmful to wool except slight yellowing
      • Less wool staining
  • 14. Correction of faulty dyeings
    • Faulty shades can be levelled or partially stripped with
        • X gpl carrier
        • 2-4% levelling agent for wool
        • 1 –2% emulsifying agent
        • pH 5-6% with HAC’
      • Treatment at boil for 1 –2 hrs or 103 -106 0 C for 1 –1 ½ hrs
      • If only shade on wool is to be corrected, carrier is not necessary

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