Thermal transfer technology (1)

The thermal transfer technology has been applied to fabric thermal transfer printing very early. With the rapid development of high technology, thermal transfer technology has become more and more widely used.

The classification of inks includes thermal transfer printing and thermal sublimation transfer printing; the classification of fabrics, plastics (plates, sheets, films), ceramics, and metal coated plates from the transferred materials; Screen printing, plain printing, gravure printing, embossing, ink jet and ribbon printing, etc.; thermal transfer paper and thermal transfer plastic film are classified from the substrate. The following focuses on the heat transfer and sublimation transfer printing technology.

First, hot pressure transfer technology

The hot-pressure transfer printing technology is firstly printed on a thermal transfer paper or a plastic film by screen printing, gravure printing, etc., and then transfer the graphic and text to articles such as fabrics and leathers by heating and pressurizing.

(I) Ink Formula Example

Examples of screen printing thermal transfer ink formulations are as follows (for reference only).

N-methoxy methyl polyamide 19%

Benzyl alcohol 40%

Toluene 17%

Ethanol 6%

Bentonite 9%

Pigments 9%

The N-methoxymethyl polyamide is dissolved in a solvent such as benzyl alcohol, toluene, and ethanol, stirred with a heat-resistant pigment and swelling, and then ground into a screen printing ink. The ink is printed on a carrier (such as a thermal transfer paper) by a screen printing method, and then the fabric is subjected to heat transfer printing.

(b) Structure of hot pressed transfer paper

There are three types of structure of hot press paper.

1. It consists of a thermal transfer paper, an ink layer, and an adhesive layer, as shown in FIG.

2. It consists of a thermal transfer paper, a clear release layer, an ink layer, and an adhesive layer, as shown in FIG. 2 . Transparent release layer can be used as a protective film for ink.

3. It is composed of a thermal transfer paper, a transparent release layer, an ink layer, an adhesive layer, and a hot melt powder layer, as shown in FIG. 3 . The heat transfer paper sprinkled with the hot melt powder layer had the best resistance to friction, fastness and adhesion.