PCS Challenge

Polyester dyeing by exhaustion – responsible, ecological and economical (energy saving)

Polyester fibre dyeing ability

The polyester fibre dyeing ability is affected by many factors from primary spinning or the final finish

  • From primary spinning 
    • Monomers used and their quality.
    • Polymerization conditions.
    • Extrusion spinneret. Fibre section.
    • Drafting degree.
    • Crystalline and amorphous proportion zones.
    • Fibre fineness. Amount of filaments.
    • Oligomers, etc. etc.
  • From posterior oiling
    • Types of oils and antistatics.
    • Emulsion ability and elimination.
    • Sizing agents
  • Thermic history 
    • According to the heat treatment applied to the polyester fibers, this directly affects the tinctorial capacity, depending on         temperature, drafting, or relaxation, etc. etc.

Polyester fibre

  • Nowadays, more than 40 million tons of polyester fibres are produced in the world every year
  • The number of manufacturers has grown uninterruptedly
  • The differences between manufacturers have multiplied/li>
  • Talking about fibres of polyester, is to talk of infinity of variants, with different dye capacities, different behaviors, etc.
  • In practice, the differences are so high that we can even talk about naturalization of the polyester fibre
  • Just like natural fibers (cotton, wool, etc.), polyester has a wide range of variants, and these greatly affect their dyeing properties

Tinctorial behaviour of different polyester fabrics – Spanish customers

Customer 1

Customer 2

Customer 3

Customer 4

Samples drawn after
Dyeing for 20 min. at 105ºC

In the same liquor with a new fabric, rising to 130ºC and mantaining for 60 min.

100% PES

100% PES

Dull PES
Bright PES

96% PES
4% PU

End result samples after 130ºC

Theoretical ideal solution

  • Nowadays we have means that allow us to optimize dyeing
  • On every fabric we need to check
    • exhaustion curves of basic colours
    • Behaviour at different temperatures
    • his allows the selection of colours and to determine the process and the use of certain auxiliaries
  • This series of trials are long (time) and costly economically
  • Unfortunately a dyeing section which works for third parties and receives polyester items to be dyed, is unable to optimize piece by piece/li>
  • The theoretical solution is not valid

PCS Challenge

The solution for the polyester fibre dyeing

PCS Challenge is based on the use of specific auxiliaries to minimize the dyeing problems

  • It eliminates problems caused by:
    • Spinning and sizing additives
    • Presence of oligomers
    • It levels the exhaustion of the dyes and fiber affinity
    • Decreases, between 10 – 15ºC, the maximum temperature of dyeing
  • It ensures
    • Decreases process time to 110 minutes
    • Lowers water consumption by at least 3 liquors
    • It uses less energy
  • It guarantees
    • Optimal results, with first time dyeing in 98% of cases

PCS Challenge ~ Classic process


PCS Challenge products


  • Guarantees the extraction of primary spinning additives, as well as polyester surface sizing.
  • It eliminates a high proportion of oligomers.
  • It provides hydrophility to polyester fibre


  • pH buffer between 4.5 – 5.
  • It solves the problem of bicarbonated or acidic waters


  • Diffuser and migrator of the dye on the fibre.
  • It allows the dyeing temperature to be reduced


  • Improves the levelness of the disperse dyes.
  • It does not retain dyestuff in the final dye bath


  • Acid reducer which allows to eliminate the non fixed dyes, in the same dyeing bath at 80°C.
  • It reduces to a single rinse bath and protects the fibers to remain acid pH

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