Supercritical fluid dyeing and the orientation of crystallites in PET fibres

Supercritical CO₂fluid as an alternative dyeing medium causes changes in the fibre structure depending on the temperature and pressure of the treatment. An investigation was made of the changes in crystalline orientation in polyethylene terephthalate (PET) fibres under the influence of supercritical CO₂. The changes were investigated by..

Lyocell/Tencel treatment in modern piece-dyeing machines

Choice of piece dyeing machine for use with lyocell (or more specifically, Tencel) is considered. The particular design features necessary for processing such fibres are discussed and the example of the Krantz Aerodye machine given. Fibrillation is the most distinctive feature of lyocell fibres. The intensity of fibrillation is affected b..

Dyebath pH control of dyeing machinery under dynamic conditions: Fact or fiction?

The incorporation of a method of closed loop feedback pH control into the automatic control of dyeing machinery was studied. The method was based on the use of preset pH profiles that either are linear, exponential, or quadratic in shape. An on-line pH meter and dosing pumps attached to a pilot-scale dyeing machine were used together with..

Revolutionary approach to waste treatment

Plants are operating in Italy and Spain using bioflotation tecnology to treat effluents from the dyeing and finishing process. The system produces an 'activated foam' which acts as a supporting structure with a high surface area for bacterial activity. The process gives a high level of performance and can be used either as a pre-treatment..

Energy recovery also gives fresher air

Marcel Liebaert UV of Belgium, textile dyers and finishers, have recently installed an exhaust cleaning system from Koerig of Switzerland. The installation brings additional 'green' benefits by recovering waste process heat, enabling the company to save energy by burning less fuel. The Koerig system is explained in this article, and has b..

Equipment for the dyeing laboratory (Italian) (Attrezzature per il laboratorio di tintoria)

In recent years quality has become an important concept in manufacturing industry, including the textile industry. However in the face of increased competition and falling demand, price, rapid delivery and service have become more important. It is now desirable to produce quality without increasing production costs. One way of ensuring qu..

Energy Saving -- By Padding Mangle.

Padding mangles impregnate fabrics with processing solutions and squeezes excess amounts of processing liquid from the fabrics. Removing excess liquids from fabric is an energy consuming process that is greatly influenced by the mangle efficiency. The hardness of the rubber rolls and the uniformity of the pressure applied on the rubber ro..

Aftertreatment for Improving Washing Fastness Quality of Some Azo Dyes on Textile Fibers.

Researchers synthesized five azo dyes by acetylating the amino group of H-acid and coupling the resultant products with different compounds, dyed wool and nylon 66 fabric samples, determined dye fixation and washfastness properties in the samples, teated the samples with dicyandiamide, and redetermined the dye fixation and washfastness pr..

Machines Give a Hand for Accurate Dispensing.

Dispensing equipment for printing includes Stork's Rhea color kitchen for samples, which complements Stork's saturn production dispensing machine. The Rhea system dispenses up to 60 colors and chemicals and up to eight thickeners. Two dispensing stations in a cascade system dispense samples into 1-5 liter cups. The Rhea system uses the sa..

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