Solution To The Problem Of Fabric Storage Crease Color Change

< p > dialogue person: < /p >

< p > Wang Shilei Jiangsu golden sun < a target= "_blank" href= "//www.sjfzxm.com/" > textile /a > Science and Technology Co., Ltd. R & D director < /p >

< p > Dong Qinxia, chief engineer of Shenzhou International Group Holding Co., Ltd. < /p >

< p > Xu Gucang, consultant of dyeing and finishing Specialized Committee of China Textile Engineering Society < /p >

< p > Wang Shilei: every year, the company finds dyed color change in dyeing process.

First of all, I would like to introduce the specific production conditions of the product: < a href= "//www.sjfzxm.com/news/index_c.asp" > pure cotton fabric < /a > pretreatment first, then mercerizing, mercerizing and dyeing. The dyestuffs used are 23 red, 145 yellow and 220 blue. Three kinds are all dyestuff. The color fastness of these three dyes can meet the requirements of the product. Meanwhile, in the problem of crease color change, we find that three dyes are lighter.

< /p >

< p >, in addition to the possibility of poor sunshine fastness and poor climate fastness, are there any other reasons that cause crease and discoloration? I hope that the experts and colleagues here can help me solve the problems that have troubled us for a long time, and I also bring samples of discolored fabrics.

< /p >

< p > Dong Qinxia: our company has encountered similar problems in the production process, which is the color change problem in home textile products.

As the product is ironed after the production is finished, and generally ironing is steam ironing, ironing is directly wrapped in plastic bags for packing and shipping. When customers open the packaging, it is found that some products are discoloring.

Through understanding and analysis, I found that this is the problem of color fastness.

This example shows that any minor negligence may have a great impact on the product.

The color of the fabric you bring is sensitive, so the color changes a little. It looks very obvious to the naked eye. How long does it take to store it? How long does it take to crease the color change? < /p >

< p > Wang Shilei: there will not be any problems in the short term. If there are more than 3 months of storage, there will be a problem of crease and discoloration.

< /p >

< p > Dong Qinxia: is the color of the crease more in summer or in autumn and winter? < /p >

< p > Wang Shilei: there are many problems of crease and discoloration in warm and humid summer.

< /p >

< p > Dong Qinxia: for the problem of crease color change, first of all, the color of the sample cloth is very sensitive, so the color will be a bit discolouration. Secondly, if the creases are in the wash process after dyeing, if the washing is not enough, it may cause crease and color change. Do you take fabric mercerization or yarn mercerization in the production process? < /p >

< p > Wang Shilei: take < a href= "//www.sjfzxm.com/news/" > fabric mercerizing < /a >, first through the fabric mercerizing and then dyeing the fabric.

< /p >

< p > Dong Qinxia: usually after the dyeing process is finished, the material should be softened. I suggest you take a piece of sample before softening process, and test the acid and alkali content of the fabric in the laboratory with pH agent.

At the same time, after the fabric is softened, the pH value of the fabric is tested, and whether the change of pH value is the cause of crease color change is analyzed.

For fabrics that are prone to discoloration, more samples should be taken and tested.

My view is that in the hot and humid summer, the moisture content of the air is very high. During the storage process, the alkaline fibers of the fibers will spill over to the surface of the fabric, causing color changes.

< /p >

< p > in general, dyeing of reactive dyestuffs will result in unqualified pH value during inspection and sampling. In fact, fabrics are qualified when they are out of factory. However, after placing fabrics for a period of time, due to climatic reasons, the fabric will contact with the air for a long time, and the fabric's internal fiber will overflow. The pH value of the fabrics will change, resulting in unqualified pH value, including the export of a target= "_blank" href= "//www.sjfzxm.com/" > clothing < /a > the value of the pH is not qualified due to overflow of fabric fiber lye.

Therefore, I suggest you control the pH value of the fabric slightly acidic when the fabric is finished.

< /p >

< p > Wang Shilei: do you think there are other reasons for crease discoloration besides pH value? < /p >

< p > Dong Qinxia: another possible reason is that during the storage of sunlight, the electron layer of dye atoms is changed by sunlight, which causes the color of the creases. If the sensitivity of the dye is qualified, it will prove that the dye is no problem.

I think we should find the answers to the questions in the direction of production technology.

< /p >

< p > Wang Shilei: I think a href= "//www.sjfzxm.com" > dye > /a > should be no problem, because the three kinds of pigments we choose are very good in sunlight.

< /p >

< p > Dong Qinxia: the initial color fastness of the pigment may be very high, but after placing it for a period of time, especially when the strong light is irradiated for a long time, the electronic layer of dye atoms is likely to have electron layer pition. Therefore, I think the causes of crease color change should include two aspects: dye selection and process control.

< /p >

< p > Wang Shilei: is there any other reason that causes crease color change? < /p >

< p > Xu Gucang: I have also encountered this kind of situation. When I used to do dyeing of similar color fabrics in factories before, if I used the technology of first mercerizing and dyeing, there would be crease and discoloration in creases. Later, in view of this problem, technicians also carried out many trials and tests, but the results were not obvious enough.

< /p >

< p > I think your company must control the preservation of every process and material, including process parameters, personnel operation and preservation of samples.

Because there are many unexpected changes in color for sensitive color system. This is a common problem of sensitive color system, and is also a problem which has plagued printing and dyeing factories for a long time.

So I suggest that your company strictly control from the source of the production line, for each link to carry out a specific analysis, you can find "a href=" //www.sjfzxm.com "crease color change < /a" reasons.

< /p >