Screen Printing Burnout Process

In recent years, with the development of the market, there has been a large demand for sofas, backrests, handrails, quilts, bed sheets, curtains, tablecloths, tea table cloths, and clothing, which are commonly used in hotels, restaurants, hotels, and conference rooms. These handicrafts have the advantages of high strength, good abrasion resistance, excellent color fastness, no ironing, no wrinkle, good washing, quick drying, etc., and are well received by people.

Burnt-out process is the use of two fiber-blend fabrics with different acid resistance. After the acid burn-in paste printing and chemical processing, the natural fiber that is not resistant to acid is partially rotted. Expose the acid-resistant chemical fiber part to form a crystal clear pattern, which makes it look beautiful and has a high-grade and beautiful feeling.

In addition to the use of special equipment, the burnt-out process mainly involves manual platen printing.
The quality of burnt flowers is reflected in the transparency of the burned parts. The outline of the flowers needs clear, non-permeability, little flowers, a lot of flowers, and continuous lines. The pattern is beautiful and the layout is accurate.
When designing patterns, avoid oversizing small points, lines, and faces. For the design of rotten printed patterns, wiring in the burnt and printed areas should pay attention to leave an appropriate gap to prevent the rotten printing paste and printed pulp infiltration. Destroy the effect of the pattern. Dressing should not be excessive, and it is difficult to avoid the full version.

Burnt grey fabric selection, the current supply of burnt fabrics on the market are mainly the following, polyester/cotton core white cloth, burnt part of the transparency is good, suitable for high-grade burnt-out products. Polyester/cotton blended fabrics have poor transparency in burnt-out areas and can be used for general burn-out products. C/cotton core cloth, good transparency of burnt parts. Among them, polyester dyeability is poor.

Burnt wire mesh selection. - General use of polyester mesh, its long life. In the absence of polyester screens, Nitten screens are also available, with 160 to 200 mesh being preferred.

When designing a drawing, attention should be paid to the following issues: When the burnt drawing is drafted, appropriate gaps need to be left at the pattern connection, and the lines should be fine, well-proportioned, and accurate. Films should be kept clean, and burnt-print plates should be made of acid-resistant photopolymer.
The spent pulp was prepared using 98% sulfuric acid. After testing, the amount of sulfuric acid per litre of burnt pulp is about 20 to 60 mL. The use of potato flour slurry, but not too thin, too thin can not reach the purpose of fixing spent pulp in the flower position. Slurry is too thick, poor penetration, scratching difficulties, affect the integrity of the pattern. White dextrin can also be used, accounting for 12% to 20% of burnt pulp. Synthetic rubber can also be used, which accounts for 2% to 4%.

After the squeegee is printed, steaming or baking can be used to carbonize the printed grey fabric. The carbonization process determines the length of the carbonization according to the temperature of the baking. When the rinsing starts, the burned part of the grey fabric appears. Yellow, with the extension of time, the color gradually darkened to light brown, dark brown until dark brown. It is difficult to wash the residue of burnt pulp when it is dark brown. In order to ensure the quality and general temperature in the burnt part of the light brown is appropriate, it is easy to wash off the spent pulp residue.

It should be noted that the preparation of burnt-out, the ratio of slurry and acid, and the baking time must be tested several times until the optimum.

The burnt-out version is often washed during the squeegee process to extend the service life.

Source: Asia-Pacific Printing Network