First, direct printing
Direct printing is a direct printing on white fabric or on pre-dyed fabric. The latter is called overprint. , Of course, the color of the printed pattern is much deeper than the background color. A large number of common printing method is direct printing.
If the fabric is white or mostly white, and the prints look lighter from the back than the front, then we can conclude that this is a printed fabric. (Note: Due to the strong penetration of the printing paste, Fabric can not be judged by this method).
If the front and back of the fabric background the same shade (because it is a piece), and the printing pattern is much deeper than the background color, then this is the cover fabric.
Second, discharge printing
Discharge printing through two steps, the first step, the fabric piece dyed into a single color, the second step, the pattern printed on the fabric.
The second step of the printing paste contains a strong bleach can destroy the background dye, so this method can produce blue and white dot patterns of cloth, this process is called pull white. When the bleaching agent and it will not react with the dye mixed in the same color paste (vat dyes of this type), the color printing can be carried out. Thus, when a suitable yellow dye (such as a vat dye) is mixed with a colored bleach, a yellow dot pattern can be printed on the blue fabric.
Because the background of discharge printing is the first use of dyeing method of dyeing, if the background is printed on the floor than the printing, the background color is rich and much deeper. This is the main purpose of using discharge printing.
Discharged printing fabrics can be printed by roller printing and screen printing, but can not be printed by heat transfer printing. Because of the high cost of printing fabric compared to direct printing, care must also be taken to control the exact amount of reductant required for use. Fabrics printed this way are better sold and more expensive. Occasionally, the reducing agent used in this process can cause damage or damage to the fabric at the printing process.
If the fabric is the same color of the background color of the front and back (because it is a piecemeal), and the pattern is white or not the same color as the background, you can confirm the discharge printing fabric; carefully check the pattern of the reverse, will (This is because the chemical that destructs the dye does not completely penetrate the opposite side of the fabric.)
Third, anti-dye printing
Anti-dye printing includes two-stage process:
(1) a chemical or waxy resin printed on white fabric to prevent or prevent dye penetration into the fabric;
(2) piece dyeing fabric. Its purpose is to dye the background to bring out the white pattern. Note that the result is the same as that of the printed fabric, however the way to achieve this result is the opposite of the discharge printing.
Anti-dye printing method is not common, generally can not be used in the case of the background color can not be used. Most anti-dye printing is done by methods such as handicraft or manual printing (like wax printing) rather than mass production.
Because the discharge printing and dyeing anti-dye printing have the same effect, so usually through the naked eye often can not identify.
Fourth, paint printing
The use of paints rather than dyes to produce printed cloth has become so widespread that it is beginning to be treated as a stand-alone printing method. Paint printing is the direct printing of paint, the process is often called dry printing, as distinguished from the wet printing (or dye printing).
By comparing the same piece of fabric printing parts and unprinted parts of the hardness difference, you can distinguish between paint printing and dye printing. Paint printing area than the non-printing area feel slightly harder, maybe a little thicker. If the fabric is printed with a dye, the printing area and the unprinted area there is no significant difference in hardness.
Darker paint prints are more likely to feel harder and less flexible than light or light colors. When inspecting a piece of fabric with a paint print, make sure that all colors are checked, as there may be dyes and coatings on the same piece of fabric. White paint is also used for printing, this factor should not be overlooked.
Paint printing is the cheapest printing method of printing production, because the coating is relatively simple printing, the process required least, usually do not need steaming and washing. Paint is bright, rich color, can be used for all textile fibers. They are good for light fastness and dry fastness, and are even superior, making them widely used in decorative fabrics, curtain fabrics, and apparel fabrics that require dry cleaning. In addition, paints rarely produce large chromatic aberrations on different batches of fabric, and cover the underlying color well when overprinted.
With constant washing or dry cleaning, paint printing will gradually fade, the color is getting lighter. This is due to the constant rotation during the cleaning and mixing resin adhesive gradually shedding. After 20-30 times of cleaning, the printed fabric will obviously fade. Color fastness is improved by treating the fabric with resin and silicone softener in the finishing process. It is worth noting that darker colors fade more easily than light or light colors.
Paints make the fabric feel hardened printing parts, light-colored when the situation is not obvious, it is very prominent when dark. Coatings are not particularly resistant to abrasion, especially darker ones. Dark paints should be especially avoided for use in decorative fabrics such as furniture.