Screen printing process of the hottest CD and anal

2022-08-02
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Analysis on the process and key points of CD-ROM silk printing

silk printing is the abbreviation of silk printing as the name suggests. As far as CD screen printing is concerned, it is mainly composed of two parts: the production of screen printing plate and the operation of printing machine. These two parts have different emphases, but they rely on each other, restrict each other and complement each other. Any small mistake in the whole process of screen printing will affect the final screen printing effect and the quality of screen printing work. Therefore, in order to improve the quality of silk screen printing, the system introduced and the work done should be considered from the overall situation and the whole process. Only in this way can it be more effective

in order to explain the problem, the specific work content in the whole process of silk screen printing can be roughly divided into the following detailed steps:

in the production of silk screen printing plate, there are several processes: Stretching - washing - coating photosensitive paste (film pasting) - drying - developing - drying, edge sealing and leak repair - pasting

in terms of printing operations, there are: control of the printing machine -- adjustment of the position of the version -- preliminary selection of the ink brand and the hardness of the scraper according to the sample effect -- oil adjustment in case of special effects -- cleaning treatment before the disc is printed on the machine (machine table and disc) -- spot check and control of the printing quality during the printing startup -- selective check of the printing surface and information surface -- counting, packaging and packing -- the better the viscosity and temperature characteristics of the liquid, counting, registration and filling in forms -- handling into the warehouse, About the above work

each specific work has some matters needing attention and requirements. After the operators have made clear these requirements and precautions, they will have a clearer understanding of the causes and consequences of printing defects, and will greatly improve the work quality of various processes, so as to achieve the purpose of improving the quality of silk screen printing

stretching

I. some matters needing attention during stretching:

1. Surface treatment of iron frame. Remove dust, oil and burrs. Dust and greasy dirt will cause poor adhesion between glue and iron frame. Burr and sand particles may puncture the cloth and cause the rupture of the whole cloth

2. Precoating adhesive. When precoating adhesive on the frame, its thickness shall be moderate and uniform. The glue is too thin and the adhesion to the iron frame is not enough, which is easy to be pulled off by tension; If the glue coating between the cloth and the iron frame is too thick, it is easy to increase the ductility of the coating, and it is easy to shrink and deform during drying; If the coating is uneven, it will cause trouble or even damage to the bonding during fixation

3. Placement of frame angle. When the number of film lines is too high, you should pull several versions at different angles. But under normal circumstances, one angle is enough. Theoretically, when the angle is 22.5 degrees, the picture and text of the film is the least disturbed by silk, and its reproducibility is the best

4. Clamp. The clamps on the four sides of the stretching machine shall be located in the middle of the side. When clamping the cloth, the warp and weft threads of the thread shall be parallel to the clamping edge, and shall be as straight as possible. Sometimes the sun version only has moire in some parts because the yarn is not straight and has kinks

5. Initial drawing. Due to the weaving characteristics of silk, it is required to slowly awesome during stretching to facilitate the adjustment of hole shape and the acceleration of tension relaxation. At the same time, it can also prevent the danger of breaking when the tension reaches high tension. During initial tension, it is only stretched to about 60% of the rated tension

6. Pull again. The lost tension shall be compensated every 15~20 minutes, and the tension shall be repeated until the tension is stable at the rated value. Generally, it needs to be tensioned repeatedly for about three times. When the re pulling is stopped to measure the tension, the tension values in the warp and weft directions of the yarn at the four corners of the tension machine and the five positions of the center should be roughly the same. The greater the tension, the better. If the tension exceeds the elastic limit of the material, the wire will become brittle and easy to tear; Due to insufficient tension and lack of resilience, the silk is easy to stretch and deform during printing. The rated values of the tension of different specifications are different. The bottle blanks are the same after they are created: the common specifications are shown in the following table:

the tension obtained at the beginning of the specification and maintained after re drawing.

alvant's proprietary aluminum matrix composite enables the components to accurately optimize the strength weight ratio and firmness weight ratio when needed. Y tw 15n/cm about n/cm

y PW 15n/cm about n/cm

y tw 17n/cm about n/cm

y About PW 15n/cm n/cm

the specific conditions shall be adjusted appropriately according to the objective conditions during the drawing process, but the design requirements of Henderson printing machine require that the plate tension shall not be less than 18 n/cm

7, solid. It is to use glue to bond the cloth and iron frame firmly. If there is a deep and uniform color on the bonding surface, it indicates that the bonding is sufficient. If there is a light color area, it indicates that the bonding of this area is insufficient, and it should be repaired. When fixing, try not to let the glue drop into the printing area of the plate. The cloth may be scratched due to carelessness during repeated cleaning to remove the glue

8. Trimming and marking. The stretched version had better mark the cloth specification at the convenient place of the frame edge. If there are different pulling angles, it is better to indicate the angles, so as to provide convenience for repeated use

(to be continued)

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