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What you have to know about printing 2022.11.11

What is the difference between cloth printing and embroidery and jacquard?
Fabric printing refers to printing various patterns on the cloth surface that has been woven, dyed and finished. The patterns can be flat, three-dimensional or multiple colors. Printing materials are both water-based and oily. In terms of technology, there are manual silk screen printing and mechanized operation. Of course, in addition, there are many other printing processes, such as reactive printing, transfer printing, etc.
Cloth embroidery, also known as "embroidery", or "needle embroidery", refers to the embroidery of various patterns on the cloth surface that has been woven and dyed by hand, or on the embroidery machine. Because the silk thread used for embroidery has a certain thickness, the patterns embroidered on the cloth surface are three-dimensional. Embroidery technology has a long history in China. As far as 4000 years ago, it has reached a very high level. With the progress of science and technology, computer embroidery is now the main part. In terms of embroidery patterns, there are relatively simple English and Chinese letters, or different patterns of flowers and birds.
Cloth jacquard, when weaving on the weaving machine, some needles drive some warp and weft lines to interlace when jacquard is needed, so that the yarn in a certain area rises into a uneven pattern. The pattern color can be either monochrome or colorful. It is worth mentioning that the jacquard is completed when weaving the fabric embryo, and the finished fabric cannot be jacquard any more. Jacquard products are more common in bed sheets, curtain cloth and underwear products.
What is the cause of crease printing in rotary screen printing?
When the rotary screen is scratched by the printing scraper, the force on the concave and convex parts is not consistent with the force on the plane without concave and convex parts of the rotary screen. The color paste squeezed on the printed fabric is more or less due to the different gap between the rotary screen and the fabric, resulting in uneven scratch printing, resulting in deep and shallow rotary screen crease printing. From the perspective of morphology, the rotary screen crease print includes linear and diagonal rotary screen crease print, horizontal strip crease print and block rotary screen crease print.
(1) Straight line and oblique line circular screen crease printing. Such defects are caused by uneven longitudinal force of the round mesh. The specific causes are as follows: ① Improper operation or lack of caution in the screen making process. If the screen lifting action in the developing tank is too fast, there is water in the screen, and the folding of the round screen is caused by the gravity of water. Or due to improper baking, too high temperature and too long time, the elasticity of the rotary screen is reduced, and the folding printing is generated due to external force. ② Unreasonable network unloading operation. When unloading the rotary screen, the screen holder or tray is not used, but the hand holder is used. The color paste left in the rotary screen has a certain weight, and the area of the screen held by hand is small, which is easy to cause local straight strip crease marks. ③ Printing machine operation problem. When the printing machine is just started, the magnetic rod pressure is too large, the range of flower movement is too large, and the rising and falling speed is too fast, which is easy to cause folding; The pulp level is too high during production. When the screen needs to be lifted for color change and screen washing, the large gravity of the color paste will cause folding and even damage of the round screen.
(2) Horizontal strip screen crease printing. The occurrence of such defects is related to the operation of installing or removing the scraper. The printing scraper was handled carelessly, so that the sharp corners of the scraper, feed pipe head or scraper blade bumped the round screen, and the crease of the round screen was horizontal.
(3) Block round screen crease printing. The occurrence of such defects is related to the collision of the round mesh. The specific causes are: ① The round net is accidentally bumped during transportation. The printing nickel screen or printing rotary screen is collided during packaging and transportation, or the rotary screen is damaged by vibration during transportation, resulting in blocky depressions and blocky rotary screen creases during printing. ② Inadvertent operation of loading and unloading the rotary screen will result in local depression when touching the rotary screen, which will result in block crease printing of the rotary screen.