Eliminate Oligomers from Polyester & Dyeing Machine
What are Oligomers ?
Oligomers are the unreacted low molecular weight monomers and dimers spent during the polymerisation of diethylene glycol and terephthalic acid, which is a process for manufacturing polyester. They have different structures and are classified according to the number of units they contain.
These oligomers exhibit high thermal sensitivity; hence they migrate from the core of the fibre to its surface during high temperature polyester dyeing. The depth of dye determines how many oligomers are displaced.
These oligomers are insoluble and agglomerate to form bigger crystals. The presence of oligomers can lead to nucleation and growth of dye crystals resulting in dye spots, unevenness, and poor fastness.
What are the major problems due to Oligomers ?
• White deposit on yarn or package
• Deposition on machine wall
• Uneven dyeing
• Clogging of spindles
• Dusting during rewinding, knitting, and weaving
• Improper pump pressure due to deposits on pump
• Variation in rate of rise of temperature due to deposits on heating elements
• Duller shades
• Higher energy requirements
• Increase friction value of yarn resulting in more yarn breakages in winding
Considering problems and its remedies, textile chemical manufacturing company Nestor Industries has developed a novel process auxiliary called Oligo - ER to resolve the problem of oligomers in polyester dyeing.
Unique features
• It removes oligomers and improve quality of dyeings
• It prevents shady spots, removes white powder
• It prevents re-staining oils removed from polyester fabric
• It reduces frequency of machine cleaning by removing stains from machine heat exchanger and dosing pipeline.
How Oligo-ER Works –
Polyethylene terephthalate polymers have a certain proportion of low molecular weight compounds referred to as oligomers, which are produced during the manufacture of polyester. At temperatures above the Tg [Glass Transition Temperature] of polyethylene terephthalate, oligomers migrate out of the fibre and onto the surface. These oligomers tend to deposit on the surface of the polyester and create a sticky formation with disperse dyes and non-ionic retarding agents on the dyeing machine on cooling. Since oligomers cannot be dyed with the disperse dyestuffs, they appear as a white dusting powder on the dyed goods.
Oligo - ER can keep the oligomers in suspended, or dispersed, form. Oligo - ER will prevent the re-deposition of oligomers onto the fabric allowing more oligomer to go down the drain.
+91 8306083020 | +91 9377781836
