Application Of Plant Dyestuffs In Real Silk Dyeing And Printing

At present, the research and application of natural dyestuff are more, while natural dye printing has less research and application.

In fact, natural

It can also be applied to real silk printing.

Natural silk dyestuff printing has existed since ancient times. However, the development of natural silk dyed silk screen printing technology is a new technology that needs to be perfected and popularized.

According to the scientific and technological personnel in India, the printing paste made of four kinds of plant dyes, namely, dragon glue and Berberis roots, walnut bark, madder leaf and Jatropha curcas flower, can be successfully applied to silk screen printing.

The dye solution extracted from plant material should be heated and concentrated. The 100ml dye solution is concentrated to 5ml, and the standard color light source can also be used to verify the "ISO spectrum" fabric, that is, the two colors of fabric match with a certain light source, but there will be obvious differences under another light source.

The prepared dye concentrate can be used directly to prepare color paste.

Mordant also uses the above three mordant dyes, using two methods: pre mordant dyeing and synchronous mordant dyeing.

In mordant dyeing, mordant is directly put into the human color paste with the following formula.

The formula of 100ml printing paste contains: dye concentrate 4.0mL, dragon glue 5.0g, fixing agent 1.0ml, mordant (according to paste weight) alum 10% or copper sulfate 1.2% or ferrous sulfate 1.5%.

The printed silk is degumming and then pressed in semi wet condition after half drying.

The color fastness of printed silk fabric was tested after drying, steaming and washing.

The printing test results showed that the color fastness grade of all four kinds of dyestuffs was good to good, and the results of two different mordant dyeing methods were the same.

However, the washing fastness of printed silk with synchronous mordant method is better than that of pre mordant printing.

Among the four dyes, the color fastness of the leaves of Berberis and alizarin was better.

However, the color fastness to perspiration is related to Berberis and Jatropha curcas.

The quality is superior.

The color fastness to wet and dry rubbing of synchronous mordant printed silk is also better than that of pre mordant printing.

Therefore, in general, it is better to use the synchronous mordant method for the printing of vegetable dyes.

Printing dyestuffs of different dyestuffs have their own advantages and weaknesses in different items of color fastness. Because of the errors caused by various reasons such as raw materials, production processes and operations, there are often different colors in different batches and even the same batch of fabrics.

If the color difference of fabric is different, if the color light source is different, the color environment will be different, and the color time will be different.

Therefore, in order to accurately evaluate the color difference and ensure the consistency of the color results, we must select the light source matching colors specified by the merchants in the standard coloured light box when visually evaluating the colors, so as to avoid the visual differences due to the different light sources or different light sources.

Therefore, different plant dyes should be selected according to the final spinning requirements.

In short, natural dyes, especially plant dyes, are currently in use.

The application of printing and dyeing is still in the exploratory stage.

China is rich in plant dyestuff resources, but its development and utilization is very low. It should be noticed by the real silk printing and dyeing industry. In order to make the result of color matching more accurate, there should be no direct light in the standard color light box when observing the color area, so as to avoid the interference of external light to the visual.

To conform to the international fashion trend.

Plant dyes are especially suitable for small batch of high-grade silk printing and dyeing. It can not only increase the added value of real silk products, but also attract more consumers who advocate healthy and green ideas to buy real silk products.