Clothing textile is a big hot field in fashion industry. It is not just resulted from the various types of fabrics, cotton, satin, organza, hemp, etc., color is a prominent element among them. Furthermore, the color fastness is a focus for every people who engaged in textile industry.
The grade of color fastness directly manifests the inner quality of clothing, and is also directly form a linkage to the health and safety of wearer. Dye molecules and heavy metal ions in textiles with low color fastness may be absorbed through the skin and cause skin damage, or even pose a threat to the health of the wearer intangibly. Therefore, choosing textiles with high color fastness is a guarantee for health to some extent.
You may have a question about what things serve for the fine colorfastness. It is too complicated to be settled in a few words. Both the internal and the external factors are included. The internal factor is about the degree of adhesion between textile fiber and dye. The external factors are about the environment conditions or outside pressure when using textile, which has great uncontrollable and unforeseeable traits. Therefore, we focus on explore the internal factors and work the internal factors on elevating the fastness of textile in itself.
There are three points of internal factors.
1.The option of dye
Dye material is the priority of color fastness. Even the auxiliary and dyeing technology are in high quality level, the color fastness cannot be in good condition with improper dye material.
When choosing dye material, below six points need to be considered.
- According to the textile fiber properties
The adhesive manner varies from fiber to fiber and dye and dye, which result in different colorfastness. After the dye type is fixed, you should consider the properties of dye material to match well with textile fiber. Different acid dyes responses to different color saturation and fastness on wool yarns. Compared with strong acid dyes, weak acid dyes have higher color fastness to wool yarns. As for regenerated cellulosic fiber and pure cotton fabrics, they can choose direct dyes or reactive dyes.
- According to the shade of the targeted color
After the dye type is fixed, you can decide the specific dyes as per the shade of the targeted color. The dye hue should close to the targeted color, or use other dyes to adjust the deviation. It is important to choose dye with high fastness index and uptake rate, which means the saturation and fastness can reach the requirement of color fastness.
- According to the fastness of dye itself
You can choose the matching color fastness of dye as per the requirement fastness of textile. In this way, it guarantees the fastness between fibers and dye can meet the requirements.
- According to the dye-uptake react on textile fiber
The different dye materials own different dyeing rate. Meanwhile, it reacts vary from fiber and dyeing condition even the dye materials are the same. Taking dye-uptake into consideration to avoid uneven dyeing effect.
- According to the compatibility between dye materials
Even the same types of dye materials, they can own different compatibility. Complementary dye materials must match well with great compatibilities to achieve good color fastness. While as for conflicted colors, the good compatibility of three primary colors is suggested to use for complement so as to avoid uneven dyeing effect.
- Set limits to the numbers of dye colors
Choosing the dye that color hues close to the targeted colors, and using one or two dye materials with same color series to complete missed color. In this way, it can form a firm integration with textile fibers and create a fine color saturation.
2.The option of auxiliary
- The coordination of auxiliary and dye materials
After the confirmation of dye type, the well supporting auxiliary is selected. The proper use of auxiliary can facilitate fixation of textile, and then enhance the color fastness.
- Bring down the usage of retarding auxiliary
The retarding auxiliary aims to slow down the dyeing rate. It extends the time of uptake and weakens the capabilities of integration, which is bad for color fastness to some degree.
- The use of dye fixative
Dye fixative can elevate the fastness of dye materials. So, it is a vital consideration to choose the dye fixative. The usage, temperature and using time of dye fixative all of them embody the different fastness with different grade of dye materials.
- Soaping and water washing
It is an essential to fully washing under the reasonable washing temperature and time. In this case, to enhance floating color wash effect and color fade under using process.
- The use of fabric softener
The proper use of fabric softener can enhance the hand feeling of textile fabric. There have four types nature of softener: cationic, anionic, nonionic and organic silicone. As the last process of dyeing, the reaction of dye material and softener may lower the color fastness. Therefore, the usage of fabric softener should be well controlled to avoid affecting on touch feeling and color brightness.
3.The option of dyeing process
The dyeing process is the key of coloring color. The dyeing time, warming-up and maintaining time are considered into the selection of dyeing process to achieve the best color fastness to various textile fabric.
By analyzing, we have learned that there are total three main points of internal factors. In order to make fabric have high color fastness, we need to pay attention to every step of production.