Flat net paint printing defects cause analysis

10. Pattern distortion (aliasing)

The pattern shape on the fabric is obviously deformed compared to the original pattern, which is called deformation or aliasing. The most obvious is when printing horizontal strips and geometric patterns on the tablets.

Reasons: (1) When the surface of the printing table is sticky and the pieces are hand-laid by hand, due to the uneven force, the pieces have a large deformation, and the pieces removed from the stamp pad after printing have a certain shape recovery, and the flowers on the fabric are restored. The pattern deforms as the shape of the piece recovers. 2 The surface of the printing table is too sticky, and when the clothing is peeled off after printing, the force is greater, so that the fabric stretches more and the degree of recovery is smaller. As the clothing piece is deformed, the flower pattern also deforms along with the clothing piece. 3 The deformation of the printing plate frame or the loose bonding of the screen and the plate frame makes the local layout loose, resulting in deformation of the pattern on the plate.

11. Version of Injury, Blisters

Outside the pattern on the printed fabric shows a regular color, small color spots, called version of the injury or trachoma. The color patches and the small color points appear in the same position on the clothes piece, appear regularly on the cloth cloth, and the pitch is equal to the running distance of the printing plate.

Causes: (1) The place where the plate of the printing plate outside the layout of the printing plate is bumped or there is a through hole after the repair. When the sealing line is not firm, there is a sand hole on the plate, and when the printing is scratched, the color paste passes through the through hole and on the fabric. On the presentation of the version of the wound. 2 There are small through-holes on the plate outside the plate pattern. The color paste passes through the small holes during squeegee printing, and the corresponding small spots appear on the composition, commonly known as "blisters." The generation of trachoma is mainly caused by screen unclean during plate making, dirt or large dust on the glass of the printing machine, insufficient exposure time, and too thin application of the photosensitive resin. The operation of the squeegee causes wear of the plate and generation of trachoma.

12. Color transfer

On a printed fabric composed of a plurality of colors, one or more patterns of colors do not match the hue of the pattern printing paste, and there is a significant color difference, which is called a color transfer.

Reasons: 1 When two patterns of different colors are connected, the pattern area of ​​the pattern printed first is larger and the slurry is given more, so that the pattern is infiltrated or piled on the fabric. The printed plate after printing is pressed to make These pastes, which are first printed on the fabric, enter the plate through the plate mesh, causing discoloration of the paste in the plated printing plate. 2 During the printing process, there is a serious “edge stain”, which causes more color paste to be piled on the printing table outside the edge of the fabric or on the edge of the fabric. When the printed pattern of the back print is in contact with or adjacent to it, the color paste passes through the pattern net. Holes enter the plate to discolor the color paste. When the printing plate is changed to a different hue, the unsaturated paste remains in the plate or in the gap of the squeegee. When the squeegee is in operation, these residual pastes are mixed into the paste in the plate to discolor the paste.

13. Flower position is not allowed

The position of the individual print patterns printed on the clothes piece is inconsistent with the production requirements, and the position of the flower type is not allowed.

Reason: The location of the patch on the printing table is inaccurate.

14. Wrinkle and lack of flowers

The wrinkled part of the printed fabric is incomplete.

Reasons: 1 The fabric before printing has serious wrinkles. When the fabric is applied on the printing table, the folded wrinkles are not spread flatly, and the printed wrinkle-wrapped portions cannot be printed. (2) When spreading a piece of cloth on a printing table, if the surface of the table is more viscous and the fabric is thinner, if the operation is inadvertently producing wrinkle printing, there will be missing flowers.

15. Flowers are not allowed

The continuous pattern pattern on the horse cloth does not exhibit a certain pattern of continuous defects, which is called inaccurate patterning. Shown as horizontal (bub weft) neutral or pattern overlap (produced during manual printing).

Reason: The printing position of each piece of cloth on the printing table is inaccurate. If the front end of the cloth exceeds the printing position in the next stage, the piece of cloth over the printing position is not printed with the pattern, resulting in a gap phenomenon; If the front end of the cloth does not reach the printing position on the stamp pad, the front end of the printed cloth tail will be overlapped again.

16. sewage <br> <br> continuous edge pattern or patterns flower patterns alone, and requires one or more color patterns printed on the printed fabric to the garment edge portions at the edge of the fabric with a pattern of presenting serious bleeding , Make the outline of the pattern blurred or the pattern deformation, if the two different colors of the pattern are connected or adjacent to each other, the phenomenon that the third color will appear is called edge stain.

Causes: (1) The paper that is attached to the underside of the printing plate (the contact surface with the fabric) for the shade pattern is farther away from the edge of the fabric, that is, there are hollow patterns outside the edge of the fabric. When the scraper is running, the color of the pattern outside the edge of the fabric is The pulp is stacked on the stamp pad. If these color pastes are continuous with the fabric, the fabric will seep. If it is pressed by the printing plate after printing, the fabric will be contaminated and the pattern will be blurred or even deformed. Two patterns of different colors will appear. The third color is produced when connected or adjacent. 2 When the scraper runs in the plate, it stops at the pattern part, which not only makes the local fabric get too much slurry, causing the pattern to infiltrate. At the same time, the edge of the piece will also be colored and cause dirt.

17. Bianbian

Continuous pattern pattern or individual pattern pattern, and require one or several colors of the pattern should be printed on the printed fabric on the edge of the garment, showing the pattern is not printed on the edge of the fabric, and the width of the gap is not equal, known as white side. Reasons: 1 The position of the paper that is attached to the plate below the block pattern is improper, so that the edges of the fabric may not be partially or completely printed. 2 The width of the cloth on the stamp pad is too wide or the piece is too small. The edge of the fabric exceeds the pattern of the plate. 3 When the cloth is placed on the stamp pad, the position shifts, so that the partial edge of the fabric exceeds the pattern of the printing plate, and the pattern cannot be printed to cause a white edge.

18. Take color

The printed fabric is stained with irregularities, and the area varies in size and shape. Different types of variegated colors or regular patterns and patterns that are opposite to the shape of the flower pattern are called coloration.

Reasons: 1 During the process of uncovering or hanging from the stamped fabric from the stamp pad, the colorant and fabric of the patterned part of the fabric rub or touch each other. 2 The printed fabrics peeled off from the stamp pad have been stacked too thick for a long time and the pattern will be hidden on the surface of the fabric. 3 The pattern on the fabric is too thick and the pattern area is large. When the hand-printed cloth is printed, there is no drying equipment on the stamp pad, which is easy to produce color.

In recent years, domestic hand-printing has developed rapidly. It has the advantages of simple equipment, unrestricted quantity of color registration, and easy quality control, so that this traditional printing method is re-recognized and widely used. (Author: Wang and)