The production of photochromic defects generally requires two conditions: First, there must be wet , undried paste, and second, printed paste must be in contact with the dried paste. Both are indispensable.
Printing paste paste or copy on the surface of the printing fabric , so that the printing fabric produces a regular, similar to the printed pattern, the floral pattern should not have color and pattern photocopy; or produce a certain rule, but not a certain The stain of the shape is called a color cast.
Take color defects produced by the disease is nothing more than a copy, adhesion and folding several forms produced, it can be divided to take color flaws take color copy according to the form of expression, folding and adhesive take color take color and the like.
1. Copy and color
Produce this kind of flaws, not dry paste is printed on canvas and other fabric surface caused by contact copying take color. The ridiculous shape of the copy is often similar to or partially similar to the pattern of the unbleached paste.
1.1 The specific reason
(1) The color paste printed on the fabric is not fully dried
Because the drying room temperature is not high, the printing speed is relatively fast, especially for printing large-scale flower patterns or floor-to-floor patterns. The thick printing fabrics have a large amount of slurry on the surface of the fabric and are difficult to dry and fall into storage boxes. when there is not the surface of the fabric printing paste dry fabric patterns other surface of paste, it is easy to produce flaw take color copy.
(2) The dyeing agent absorbs moisture and overlaps
Printing paste contains moisture absorbent, when the acid releasing agent additives, when paste printing cloth is not fully drying the surface, and after stacking long time to print, an ink-absorbing moisture in the air, easily generated The law of regularity is copied.
(3) Improper operation of double steaming
Steaming printed fabrics double positive fit into the front steaming machine, when double steaming printed fabrics run against one another, in particular by upper and lower guide rollers when the tension is larger, on the front side of the front two layers of fabric prone paste The mutual adhesion, resulting in a copy of the color pattern .
1.2 Overcome the measures that can be taken to make a photocopy
(1) Printing fabrics should be fully dried
Drying should be based on rotary screen printing machine flower size, control the oven temperature and the vehicle speed printing machine, the color does not take place in the course of drying. The pattern should drop cloth paste moisture drying sufficiently prevail. Here to mention that the fabric to dry but do not over bake. Although not over-bake the color photocopying ride flaws, but produces defects cloth other issues, such as produce color unevenness, wrinkles and other issues. The surface temperature of the fabric that falls on the cloth box should not be too high.
(2) Reasonably Designing Printing Process and Strictly Controlling Consumption of Dyeing Material
Where a paste having a moisture-absorbing agent, an acid releasing agent additives in addition to printing the fabric after drying sufficiently printing, after printing should be not too long time stacked, it should be produced with steamed with printing principle. In addition, under the premise of ensuring quality, the amount of dyeing materials should be strictly controlled.
(3) Regulate double steam operation
When double steaming the cloth feed is performed, the front fabric was playing to avoid printing on the front side, but should be positive to negative, or negative anti-face. Only in this way can we prevent the steaming process, a small amount of wetting the printing paste sticky ride in the front of the printed fabrics resulting take color.
2. Adhesion color
Characteristics of such a fabric take color generated during operation, while adhering to the touching or in contact with the guide roller printing paste, air and other components, generating take color flaws. If the fabric and gumming synchronous operation thereof, e.g., color printing paste and the adhesive fabric guide rollers synchronous operation, Technical Textiles
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