Heat transfer printing on polyester fabric
2022-05-12
“Heat transfer printing”
Heat transfer printing is a method of printing patterns by transferring disperse dyes or paints printed on paper to fabric under certain conditions.
Heat transfer printingTheoretically, there are four methods: melt transfer, peel transfer, semi-wet transfer, and gas phase transfer. The commonly used method suitable for polyester fabric is gas phase transfer, also known as sublimation thermoelectric, abbreviated as thermoelectric.
The disperse dye on the board paper is volatile and has a strong affinity for polyester fabric. During the two contact heat pressing processes, the dye from the paper is transferred to the fabric through vaporization - sublimation heat.
Heat transfer printingIt is particularly suitable for small quantity printing varieties, and no post-processing is required after printing, reducing pollution, which belongs to clean processing.Heat transfer printingThe printed patterns are rich in color, with full layers and strong pattern expressiveness, with few printing defects, suitable for printing realistic, artistic photo patterns and geometric patterns.
Requirements for Heat Transfer Printing on Polyester Fabric
01
Since ordinary printing factories do not have pre-treatment equipment, polyester fabrics need to undergo pre-treatment processes such as washing, bleaching (dyeing), shaping, and softening before printing.
02
The printing base fabric can only be used for light-colored fabrics such as bleached and this bag, and cannot print light patterns on dark fabrics.
03
The temperature for heat transfer printing is generally in the range of 150 to 200 degrees. High temperatures can damage various coatings on the fabric, so when reprocessing is needed, it is usually printed first, followed by coating, compounding, and other finishing processes.
04
InHeat transfer printingthe process, different fabrics have different shrinkage rates at high temperatures, generally considering a shrinkage rate of 2% to 3%. For printed fabrics with high requirements for pattern or design positioning, special attention should be paid during shaping by individual salespersons and dyeing factories.
05
When performing thermal spraying, the effect of fabric printing will vary depending on the selected plate paper and ink.
The quality of the dyeing paper affects the effect of the pattern. Poor quality board paper has more color spots and patches, making it easy to produce color spots. Good quality board paper is made from all wood pulp, and there are no color spots or white spots after fabric printing. The ink determines the color fastness of the printed fabric.
06
During printing, digital samples may differ slightly from large samples to facilitate pattern confirmation. Previous printing of polyester fabrics in the printing factory should be based on large products when coloring the machine.
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