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How to improve color fastness

Author:QINSUN Released in:2023-06 Click:41

After dyeing, the ability of the fabric to retain its original color can be represented by evaluating different color fastnesses. Fastness to washing, rubbing, light fastness, fastness to sublimation and other fabric indicators are often used to assess color fastness.

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The greater the fastness to washing, rubbing, light fastness and sublimation of the fabric, the better the dye fastness.

The key elements affecting the above fastness are two:

The first is the dye performance and the second is the formulation of the dyeing and finishing process.</p

The basis for increasing color fastness is the selection of dyes with excellent performance and the formulation A suitable drying and finishing process is the key to ensuring color fastness. Both are necessary and must not be overlooked.


1 Fastness to washing1,1 For cellulose fiber products1,2 For polyester fabric2 Fastness to rubbing3 Fastness to light4 Sublimation fastness

Fastness to washing

The fastness to washing of fabrics is divided into two categories : Light fastness and stain fastness. In general, the lower a fabric\'s lightfastness, the lower its stain resistance.

The color of the fiber can be determined when testing the stain resistance of a particular fabric by comparing the color of the fiber against the six regularly used Textile fibers are measured: polyester, nylon, cotton, acetate, wool or silk, and acrylic are the six most commonly used textile fibers. A competent, independent, professional inspection company carries out the stain fastness test on the six fibres, and such a test is quite objective and fair.

For cellulose fiber products

The washfastness of reactive dyesis higher than that of direct dyes for cellulosic fiber goods. Insoluble azo dyes, vat dyes and sulfur dyes have a more sophisticated dyeing process than reactive dyes and direct dyes. As a result, the wash fastness of the last three colors is superior.

In order to increase the wash fastness of cellulose fiber goods, it is therefore not only the selection of the appropriate dye, but also the selection of the appropriate staining technique required. The fastness to washing can be greatly improved by strengthening the water washing, color fixing and soaping accordingly.

For Polyester Fabric

The fastness to washing of the fabric after dyeing can meet the customer\'s requirements for the deep color of the Polyester fiber conform as long as it is fully recovered and washed. Polyester fabrics, on the other hand, are generally softened through the use of cationic silicone softeners to improve fabric feel. SameThe anionic dispersion is formed early on when the polyester fabric is heated to a high temperature. The dispersed dye can spread over the surface of the fiber due to the thermal migration of the dye. As a result, after setting, the wash fastness of the polyester fabric with rich color and luster may be affectede unqualified. This requires that not only the sublimation fastness of disperse dyes be considered when selecting disperse dyes, but also the thermomigration resistance of disperse dyes.

There are several ways to determine washfastness. When assessing the wash fastness of textiles, different insights are gained due to different test standards. If the customer recommends specific information on wash fastness and specific test standards can be offered, this facilitates communication between the two sides. washing and aftercareActing can improve such as the wash fastness of fabrics, it will also increase the emission reduction in the drying factory.

Find some high-efficiency cleaning agents, streamline the drying and finishing process, and expand the research on short-process methods, what can not only lead to improvements in production efficiency, but also contribute to energy saving and emission reduction.

Rub fastness

The rub fastness of the fabric iEs is the same as the wash fastness and also includes two aspects: Firstly, dry rubbing fastness and, on the other hand, wet rubbing fastness .

Obtain the physical fabric dry rub and wet rub fastness chart. Use the fabric rub fastness tester and compare the fabric color change chart and the dyeing chart to assess the dry and wet rub fastness of the fabric. This is very handy.

When assessing theFastness to rubbing In the case of dark-colored fabrics, the degree of dry rubbing fastness is usually one level higher than the wet rubbing fastness.

As an example, we are looking at a dyed black cotton cloth. Although it has been thoroughly repaired, the dry and wet rub fastness is not very high and occasionally does not meet customer requirements. Reactive dyes, vat dyes and insoluble azo dyes are often used for dyeing in order to increase rub fastness. Reinforcing dye selection, color fiXing treatment, and lathering are all excellent ways to increase fabric scrub resistance.

Special additives that can improve fabric wet rub fastness can be selected to improve the wet rub fastness of color intensive cellulosic fiber products and improve wet rub fastness The rub fastness of the product can be significantly improved by adding special additives to the finished product - enthold water repellent. When acid dyes are used to dye polyamide fibers in deep colors, the wet rub fastness of deep-colored nylon fabrics can be significantly increased by using a specific nylon dye-fixing agent. When evaluating the wet rub fastness of sanded dark colored articles, the wet rub fastness can deteriorate because the short fibers on the surface of the sanded product break off more noticeably and other products. Color fastness to light

Sunlight has a wave-particle duality, and sunlight that Energy transported in the form of photos has a significant impact on the molecular structure of the dye. When photographs disturb the basic structure of the chromogenic component of the dye Dye structure, the light produced by the dye chromosome changes color, generally becoming lighter to the point of being colorless. The more noticeable the color shift of the Fart is in sunlight, the poorer the lightfastness of the dye.

Many approaches are used by dye manufacturers to increase the lightfastness of their colors. The increase in the relative molecular weight of the dye, the potential for internal complexation of the dye, and the coplanarity and length of the conjugated system of the dye can all contribute to an increase in the dye\'s lightfastness.

During the dyeing and finishing process, Appropriate metal ions added to achieve class 8 lightfastness in the phthalocyanine dyeIt. The formation of a bond within the dye molecule can significantly increase the vibrancy and lightfastness of the dye. Choosing colors with improved lightfastness for textiles is key to increasing the product\'s lightfastness. The Effect of Modifying Dyeing and Finishing Processes on Improving Die Lightfastness of textiles is not clear.

Fastness to sublimation

Because the dyeing mechanism of polyester fibers differs from that of other dyes, fastness to sublimation may directly reflect the heat resistance of emulsion dyes. For other dyes, evaluating the dye\'s fastness to ironing is the same as testing the dye\'s fastness to sublimation. The fastness to sublimation of the dye is poor. The dye in the solid state is easily detached from the inside of the fiber in the dry state in the gaseous state in the heat state. In this way, the fastness to dye sublimation can also indirectly reflect the fastness to ironing of the fabric.