Tuesday, 28 April 2015

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Yarn Dyeing

Yarn Dyeing

Yarn Dyeing
Yarn Dyeing
There are numerous types of yarn dyeing. Normal structures are the bundle structure and the hanks structure. Cotton yarns are generally dyed at bundle structure, and acrylic or fleece yarn are dyed at hank structure. In the persistent fiber industry, polyester or polyamide yarns are constantly dyed at bundle structure, while gooey rayon yarns are somewhat colored at hank structure as a result of technology. 

The normal dying procedure of cotton yarn with responsive dyes at bundle structure is as per the following: 

The crude yarn is twisted on a spring tube to attain to a bundle suitable for dye entrance. 

These mollified bundles are stacked on a dyeing transporter's axle one on another. 

The bundles are squeezed up to a wanted stature to accomplish suitable thickness of pressing. 

The bearer is stacked on the dyeing machine and the yarn is dyed. 

In the wake of dyeing, the bundles are emptied from the bearer into a trolley. 

Presently the trolley is taken to hydro extractor where water is uprooted. 

The bundles are hydro removed to uproot the most extreme measure of water leaving the wanted shading into crude yarn. 

The bundles are then dried to accomplish the last dyed bundle. 

After this process, the dyed yarn bundles are pressed and conveyed.

Dye Types For Yarn Dyeing 

Acidic Yarn Dyeing
Acid dyes are water-dissolvable anionic dyes that are connected to yarns, for example, silk, wool, nylon and altered acrylic fibers yarns utilizing impartial to acid dye showers. Connection to the yarn is attributed, in any event incompletely, to salt development between anionic gatherings in the dyes and cationic gatherings in the fiber. Acid dyes are not substantive to cellulosic fibers.

Basic Yarn Dyeing
Basic dyes are water-dissolvable cationic dyes that are primarily connected to acrylic fibers, however discover some utilization for wool and silk. Typically acidic acid is added to the dye bath to help the uptake of the dye onto the yarn.

Immediate or substantive dyeing is typically completed in a nonpartisan or somewhat alkaline dyebath, at or close breaking point, with the expansion of either sodium chloride, sodium sulfate or sodium carbonate. Direct dyes are utilized on cotton, paper, cowhide, wool, silk and nylon.

Stringent dyes oblige a severe, which enhances the speed of the dye against water, light and sweat. The decision of stringent is vital as diverse mordants can change the last color essentially. Most common dyes are severe dyes and there is in this way a substantial writing base describing dyeing systems. The most essential stringent dyes are the manufactured severe dyes, or chrome dyes, utilized for wool; these include in the range of 30% of dyes utilized for wool, and are particularly helpful for dark and naval force shades. The stringent, potassium dichromate, is connected as an after-treatment. Numerous mordants, especially those in the substantial metal class, can be unsafe to wellbeing and compelling consideration must be taken in utilizing them.

Vat Yarn Dyeing
Vat dyes are basically insoluble in water and unequipped for dyeing yarns straightforwardly. In any case, diminishment in alkaline liquor delivers the water solvent alkali metal salt of the dye, which, in this leuco structure, has a fondness for the yarn. Consequent oxidation changes the first insoluble dye. The color of denim is because of indigo, the first vat dye.

Receptive dyes use a chromophore joined to a substituent that is fit for straightforwardly responding with the yarn substrate. The covalent bonds that join responsive dye to characteristic yarns make them among the most lasting of dyes. "Frosty" responsive dyes, for example, Procion MX, Cibacron F, and Drimarene K, are anything but difficult to utilize in light of the fact that the dye can be connected at room temperature. Responsive dyes are by a long shot the best decision for dyeing cotton and other cellulose fibers at home or in the workmanship studio.

Scatter dyes were initially produced for the dyeing of cellulose acetate, and are water insoluble. The dyes are finely ground in the vicinity of a scattering specialists and sold as a glue, or splash dried and sold as a powder. Their primary utilization is to dye polyester however they can likewise be utilized to dye nylon, cellulose triacetate, and acrylic fibers yarns. At times, a dyeing temperature of 130 °C is needed, and a pressurized dyebath is utilized. The fine molecule size gives an expansive surface range that guides disintegration to permit uptake by the yarn. The dyeing rate can be altogether affected by the decision of scattering operators utilized during the crushing.

Azoic Yarn Dyeing
Azoic dyeing is a procedure in which an insoluble azo dye is delivered specifically onto or inside the yarn. This is accomplished by treating a yarn with both diazoic and coupling segments. With suitable conformity of dyebath conditions the two parts respond to create the obliged insoluble azo dye. This method of dyeing is special, in that the last color is controlled by the decision of the diazoic and coupling segments. This technique for dyeing cotton is declining in significance because of the harmful way of the chemicals utilized in the yarn.

Sulpher Yarn Dyeing
Sulfur dyes are two section "created" dyes used to dye cotton with dim colors. The beginning shower gives a yellow or pale chartreuse color, This is after–treated with a sulfur compound in place to create the dim dark we are acquainted with in socks for case. Sulfur Black 1 is the biggest offering dye by volume for the yarn.


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