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Screen printing methods

    There are many printing methods, such as screens, roller, heat transfer. However, each of these methods can be used one or more ways to printing, each approach has its own unique properties. These include direct printing, discharge printing and resist printing.

First, direct printing
    Direct printing is a direct printing on a white fabric or have pre-dyed fabric. The latter referred to overprint. Of course, color prints much deeper than dyed background. Number of common printing methods are direct printing.
    If the fabric background is white or mostly white, and prints from the back looks better than positive light color, then we can determine which is directly printed fabric (Note: Due to strong penetration of printing paste, so thin this method can not determine the fabric).
    If the positive and negative shades of the same fabric background (as is the piece dyeing), and much deeper than the background prints, then this is an overprint fabric.

Second, discharge printing
    Discharge printing by two steps, the first step, the fabric is dyed monochrome horses, the second step, the pattern printed on the fabric.
    The second step of the printing paste containing dye can damage the background of strong bleach, so this method can produce blue and white dot pattern fabric, this process is called white discharge. When the bleach does not it reacts with dye mixed in the same color paste (vat dyes are of this type), it can be color pull printing. Therefore, when a suitable yellow dye (eg vat dyes) are mixed with the color of bleach together, you can print out the yellow dot pattern on blue fabric.
    Because the discharge printing background is to use a piece dyed dyed way, if the background is printed up with the Montreal printing compared to the background color for a rich and much deeper. This is the main purpose of using discharge printing.
    Discharge printing fabric by printing roller printing and screen printing, but can not be printed by thermal transfer printing. As compared with direct printing, drawing printed fabric high production costs, but also must be very carefully and accurately control the use of the reducing agent required.
    This way printed fabric, better sales, higher price level. Sometimes, used in this step is also
Reducing agent can cause printing pattern of the fabric damaged or destroyed.
    If the two sides of the same color background of fabric (as is the piece dyeing), but the pattern is that the background is not white or the same color, you can confirm the discharge printing fabric; carefully check the pattern of negative, will revealing traces of the original background (the reason for this phenomenon is the destruction of dye chemicals can not fully penetrate to the reverse side of the fabric).

Third, resist printing
    Resist printing process consists of two stages:
    (1) on a white fabric printed can stop or prevent dye penetration into the fabric of the chemical or waxy resin;
    (2) the piece dyed fabrics. The aim is to dye white background to set off the pattern. Note that the results with the same fabric discharge printing, but the way to achieve this result but with the opposite discharge printing.
    Resist printing method of application is not common, usually in the background can not discharge the case will be used. Compared to large-scale production base, the majority resist printing, such as arts and crafts, or by hand printing (eg batik) and other methods to achieve.
    Because the discharge printing and resist printing to produce the same printing results, it is generally observed by the naked eye often can not identify.

Fourth, pigment printing
    Paint instead of dye production calico has been very extensive, that began to treat it as an independent printing methods. Pigment printing is a direct printing with paint, the process is usually called dry printing, to distinguish it from the wet printing (or dye printing). '
    By comparing the difference with a hardness of printing and non-printing parts of the site on the web, you can distinguish pigment printing and dye printing. Pigment printing area feel slightly harder than some of unprinted area, maybe a little thicker. If the fabric is dye printing, the printing and non-printing parts of the site, there is no significant difference in hardness.
    Dark or light colored pigment printing compared to, it is likely to feel more hard, but the lack of flexibility. When checking the existence of a printed fabric paint, make sure to check all colors, because on the same piece of fabric, may also contain dyes and paints. White paint is also used for printing, this factor should not be overlooked.
    Pigment printing printing production is the most inexpensive way of printing, because printing paint is relatively simple, the process required a minimum, usually do not require steam and water. Paint with bright, rich colors, it can be used for all textile fibers. Their light fastness and good resistance to dry cleaning fastness, even regarded as outstanding, it is widely used for decorative fabrics, curtain fabrics and apparel fabrics require dry cleaning. Moreover, almost no large color paint on different batches of fabric, but also in the background when overprint coverage is also very good.
    With the continuous washing or dry cleaning, pigment printing will gradually fade, color and more light. This is due to the continuous rotation and the mixture was stirred in the cleaning process of the resin binder due to fall off gradually. Usually after 20-30 washes, the cloth will be obvious discoloration. Since the application resin and silicone softener in the fabric finishing process, processing, and therefore improved color fastness. It is noteworthy that more dark than light or pale colors fade.
    Coating the fabric printing site feel stiff, this situation is not clear when the light-colored, dark Shique very prominent. Paint is not particularly resistant, especially dark. Avoid dark paint should be particularly in areas such as upholstery fabric.

 
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