Our company is dedicated to the screen printing department. The most common screen printing products include nylon ribbons, cross-grained tapes, re-grained tapes, ribbed cap straps, nylon satin ribbons, etc.; however, some customers will complain that the product silk screen is not correct, or the screen printing is dirty. Pollution, etc.,
Now let’s analyze the common problems of printing products:
1. A part of the warp yarn or weft yarn is turned over or moved to the front and back of the fabric, and the pattern appears exactly like the road left after being tortured. This defect is mostly caused by poor penetration of the colorant and improper handling after printing (uneven tension, etc.).
2. Print uneven color (spots) A part of the print becomes mottling like the shape of the sand fish’s skin. This defect mostly occurs when the viscosity of the color paste is not appropriate, the mesh of the screen is not properly selected, or the patch is uneven.
3. Bleeding (dissolving) The color of the printed pattern oozes out, the outline of the pattern is not clear, and the color is blurred. It is caused by the low viscosity of the color paste, the extremely concentrated dye concentration, the excessive amount of printing ink absorption, or the excessive amount of moisture absorbent.
4. Color stain (match color) The stain caused by the color of the printed pattern being contaminated to other parts. Mostly, it occurs when the printing platen is not cleanly washed, the drying after printing is not sufficiently overlapped with each other, or the fabric and the fabric are in contact with each other in the steaming process. In Japan, some factories use a control method to adjust the tension of the fabric under rope conditions for thorough washing.
5. Double-plate color difference (uneven squeegee) is tied in the transverse direction of the fabric, showing a certain interval of color depth. This defect usually occurs when the screen frame, the scraper is installed poorly, or the scraping slurry is uneven.
6. Insufficient color paste (desizing), that is, the lack of color in the pattern part. It usually occurs when the color paste is not refilled in time, the pressure of the squeegee is uneven, the hardness of the squeegee is improper, the relay of the squeegee is faulty, the surface of the printing platen is uneven, the viscosity of the color paste and the slurry are not appropriate, etc.
7. Poor pattern joints (pattern printing) The pattern overlaps or does not match (disengaged) at the pattern joints. It is mostly caused by improper adjustment of the conveyor belt or improper adjustment of the layout rules, which affects the accuracy of the flower position.
8. Misplacement of pattern (skewed, inaccurate pattern) is a printed product with misplaced patterns. Most of them happen under the conditions of inaccurate flower alignment, poor engraving, and poor patching.
9. Plate frame marks (frame printing, knock-off) The printed part shows abnormal streaks in the shape of the pattern frame. Mostly due to poor conveyor belt, poor installation of pattern frame and other reasons.
10. Bending (skewed flower shape) means that the pattern is inclined or curved to the warp and weft yarns of the fabric. It usually occurs when the printed grey cloth (silk) itself has weft skew or poor seam head or the platen cloth is skewed.
11. Color dots are small dot-like color stains. It usually occurs when there are undissolved dyes or impurities attached to the color paste.
12. Friction stain (discoloration)
It is the defect caused by contact with foreign matter when the printed pattern is not sufficiently dry, rubbing the color of the pattern part, and staining other parts. This defect mostly occurs when the printed fabric is dragged or touched by carelessness when the printed fabric is not sufficiently dried.
13. Dye splashing (screen bouncing, splattering, loose slurries staining)
It is stained by color dots caused by splash of color paste. This defect mostly occurs when the processing speed of roll printing is fast, the starting action of the screen printing is improper, and the viscosity of the color paste is not suitable.
14. Yarn tail contamination It is the yarn-like contamination caused by the yarn tail of printed silk (cloth) on the printed fabric. It is mostly caused by poor yarn handling of printed silk (cloth).
15. Deep side (medium-dark, light-dark side) is the difference in hue or depth between the two sides and one side of the cloth and the middle of the cloth. It is caused by poor fabric scouring and bleaching engineering or poor installation of screen frame, squeegee board, uneven pressure of squeegee board, and improper padding or color development engineering.
16. Joint overlap color (joint overlap color)
It is a defect caused by the overlapping color of the seams of the fabric or the joints of the printed village cloth on the fabric surface. It usually occurs when the joint of the fabric or printed interlining is too large or the seam overlap is too large,
17. Printing water stains are stains or spots caused by water droplets. This is because the fabric is dripped with condensed water or splashed with water droplets during a period of time before the end of steaming after printing.
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