Polyester fiber is a synthetic fiber industrialized around 1950, which is polyethylene terephthalate produced from terephthalic acid and ethylene glycol.
It is the most used textile material in the textile field such as clothing, interior, industrial materials, because of its excellent heat resistance, strength and dyeability.
The organization of the fabric is determined from the application and design of the final product. The processing is designed according to the organization, and various agent are required for each process.
We introduce representative processing examples for each organization and solutions from NICCA CHEMICAL.
The greige fabric, secondary contaminants such as acrylic or wax as a sizing agent in the warp in weaving before the preparatory steps have been granted.
In the scouring process, secondary contaminants are removed by continuous treatment.
Also, polyurethane blend knit also removes secondary contaminants such as oils and moisture heat set by continuous scouring process.
Some woven fabrics scouring and desizing by continuous range then batch scouring with relax.
General knit fabrics are scoured in dyeing bath.
Required of scouring agent is different from used continuous range or bath process. Therefore, selection of the most suitable agent and processing highly affects the quality of the final product.
Disperse dyes used for dyeing polyester are insoluble in water and are dispersed in water with a large amount of dispersant (Tamol or aromatic sulfonate). However, dispersant in dyestuff is not enough dispersibility at high temperature range (110°C-130°C), so, selected leveling / dispersing agent depend on dyeing machine and materials has to add in dyeing bath. Required of leveling / dispersing agent is bellow.
Dyeing is generally done in batch processing, dyeing is done by running the fabric inside the machine by looping the fabric. It is important for even dyeing that the runnability of the fabric is stable, and if runnability is not stable, it leads color difference in batch and scraped and bruised.
If this kind of occurs, it is recommended to use a dyebath quality improver.
When dyeing is finished, removed unexhausted dyestuff on fiber surface and dispersant by soaping process. In general, a soaping agent based on a surfactant is used, and in the case of a medium or dark shade, added reducing agent. Required performance of soaping agents are excellent removability against unexthausted dyestuff and reductively decomposed disperse dyes.
It is the process of adding to hand feeling and functional performance for the final product. Continuous pad process is common, required of finishing process is pad bath stability.
Functional process, there are soft hand, water-repellent, antistatic, water-absorbing and quick dry (moisture management). In general, water absorption and quick dry applied in dyeing bath. Finishing chemical, depending on the finishing agent, it may accelerate sublimation of the disperse dye in the high temperature set after padding and degreased fastness, so care must be taken for selection of finishing chemical and set temperature.
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