Do You Know The Preparation Of The Textile printing？

Textile print is the step of applying colour to textile in aviliable patterns or designs.In properly printed fabrics, the color will vary with the fiber, reducing wear and friction.Textile printing is accompanied by dyeing, but when properly dyed, the defined pattern is similarly covered by one color, allowing only a portion of the vivid real pattern to be covered by one or more colors in the unique pigment in the printing press. In the printing process, cardboard, stencil, engraving, roller or screen printing woven fabric can be used to increase the color on the fabric. The co-agents that are adapted in the printing press can accommodate thickened dyes to prevent excessive color expansion due to capillary attraction beyond the scope of the arrangement or design. 

Prepare printing cloth

The cloth must be washed and bleached. For colored ground, dye it. Always wipe the floor so that it does not pick up loose fluff, blemishes and dust when stored. Typically, the woven fabric must be cut by a fast-rotating tool that rotates around the shaft so that all filaments and knots are cut quickly and efficiently, making the cloth completely smooth, clean, and suitable for receiving the impression of the impression. Some fabrics require very careful stretching and straightening on the tenter, and then they are wrapped around a hollow wooden or iron core to make a suitably sized roll for mounting on a printer.

Preparation of colors

The art of making colours for textile printing demands both chemical knowledge and extensive technical experience, for their ingredients must not only be in proper proportion to each other, but also specially chosen and compounded for the particular style of work in hand. A colour must comply to conditions such as shade, quality and fastness; where more colours are associated in the same design each must be capable of withstanding the various operations necessary for the development and fixation of the others. All printing pastes whether containing colouring matter or not are known technically as colours. Colors vary considerably in composition. Most of them contain all the elements necessary for direct production and fixation. Some, however, contain the colouring matter alone and require various after-treatments; and others again are simply thickened mordants. A mordant is a metallic salt or other substance that combines with the dye to form an insoluble colour, either directly by steaming, or indirectly by dyeing. All printing colours require thickening to enable them to be transferred from colour-box to cloth without running or spreading beyond the limits of the pattern.

Making printing paste

the combination of cold water-soluble carboxymethylated starch, guar gum and tamarind derivatives is most commonly used for screen printing on polyester. Alginate is used for cotton printing of reactive dyes, sodium polyacrylate is used for printing of pigments, and in the case of vat dyes on cotton v, only carboxymethylated starch is used. All colors must be filtered or screened before printing to get rid of caking, fine sand and other impurities, which will inevitably damage the highly polished surface of the engraving roll and cause poor printing, so it is essential. Every scratch on the surface of the drum prints a thin line on the fabric, so care is taken to remove as much of all the grit and other hard particles of all colors as possible. Filtration is usually accomplished by squeezing the color through a filter cloth such as hand-woven cotton, silk or industrial woven nylon. Fine screens can also be used for hot or strong alkaline or acidic colors.

Making printing paste

the combination of cold water-soluble carboxymethylated starch, guar gum and tamarind derivatives is most commonly used for screen printing on polyester. Alginate is used for cotton printing of reactive dyes, sodium polyacrylate is used for printing of pigments, and in the case of vat dyes on cotton v, only carboxymethylated starch is used. All colors must be filtered or screened before printing to get rid of caking, fine sand and other impurities, which will inevitably damage the highly polished surface of the engraving roll and cause poor printing, so it is essential. Every scratch on the surface of the drum prints a thin line on the fabric, so care is taken to remove as much of all the grit and other hard particles of all colors as possible. Filtration is usually accomplished by squeezing the color through a filter cloth such as hand-woven cotton, silk or industrial woven nylon. Fine screens can also be used for hot or strong alkaline or acidic colors.