1. What should be done before the net screen is made before the screen is stretched? What is included in pre-network processing? 2. How to reduce the average roughness (PZ value) of the surface of the photosensitive layer when making the screen? 3, why do you have to completely dry the screen after coating the emulsion? 4, how to choose the screen exposure time? 5. What are the consequences of insufficient screen exposure and overexposure? 6. What are the quality problems caused by the pre-processed screen and the screened screen drying in the same oven? How to solve? 7. Is a spot color ink formulated with a standard color or a standard color? why? 8. What are the requirements for screen printing and printing processes in four-color dot printing? 9. How to calculate the width of the reproduced line when selecting a network? 10, Please calculate, 12034 (T) wire mesh should be able to print fine lines? (to be continued)
Furniture refers to a large category of appliances and facilities necessary for human beings to maintain normal life, engage in production practices and carry out social activities. The furniture also follows the pace of the times and continues to develop and innovate. Today, there are many categories, different materials, complete varieties and different uses. It is an important basis for establishing working and living space.
In today's information society, with the infinite extension of the network and broadband access to residential areas, more and more people can work from home. A home desk is a desk that is used at home, that is, office, leisure, and entertainment. Home desks are different from office desks. They are mainly selected based on the owner's preferences and personality, and are unified with the entire study or bedroom space.
With the popularity of computers in thousands of households, people pay more and more attention to the important role that computers play in daily life. Work, life, consumption, entertainment and leisure can be easily solved by a computer.
A: The pre-grid treatment consists of roughening and degreasing.
A. Polyester (PET) weakly polar materials are roughened to add a porous, non-smooth surface. The treated PET web can increase the bonding area with the photosensitive material, thereby improving the adhesion of the photosensitive material on the web.
B. The degreasing of the screen on the screen is to remove oil stains, increase the affinity between the photosensitive material and the screen, and the number of screen printing, and reduce the pinhole on the photosensitive layer during the screen printing process.
Answer: 1) The PZ value is related to the plate making method. Simple plate-making method. Capillary plate-making method Photosensitive plate-making method.
2) The PZ value of the photoengraving process should be controlled from the following aspects:
a. After the adhesive is dried, the screen is placed flat in the drying cabinet with the printed side facing down.
b. The last time the squeegee should be on the printed surface, with the screen printing surface facing down when dry.
c. The increase in the number of times the photoresist is applied on the printing surface will help reduce the PZ value.
A: If there is slight moisture in the photosensitive layer, water vapor will refract the light during exposure, thus affecting the degree of cross-linking of the emulsion. In addition, when the photoresist is not completely dried, it will also hinder cross-linking, which will lead to defects such as pinholes, degumming, and decreased adhesion of the adhesive layer and the screen, and reduction of the resistance to printing, etc., resulting in the development of the photosensitive layer before exposure. The degree is crucial.
A: Please use Ketutai special exposure ruler test. This slide rule is very simple to use. It takes only one exposure to get five exposure parameters. The correct exposure parameters must be in it.
A: 1) Underexposure:
A, the thinning of the photosensitive layer is too easy to appear pinholes.
B, the edges of the pattern or wire are prone to sawtooth.
C. The number of screen prints dropped.
D. Screen recovery is difficult. Patterned shadows tend to appear on screens that have been removed from the film.
2) Overexposed:
A. The pattern will be distorted, the fine lines will be finer, the low-key meshes will be enlarged, and the highlights will be reduced.
B. Difficulty in unloading, and there is residue in the leaked part so that the ink does not mesh.
C. The template becomes brittle.
Therefore, before the plate-making, the exposure ruler must be used to determine the exact exposure time, so as to produce different requirements of the screen.
Answer: (1) The pre-treated screen has a high moisture content, and a large amount of moisture evaporates during the drying process, thereby reducing the degree of drying of the screen coated with the photosensitive resist and prolonging the drying time.
(2) The secondary water absorption of the photo-sensitive adhesive will make the photo-resist layer unable to dry out, so that it is difficult to ensure the accuracy of the exposure (shim) parameters, and the screen quality will fluctuate greatly.
(3) The solution is: separate drying.
A: The preparation of spot color inks should be based on the reference color or the three primary colors, because this will ensure that the colors have a good hue, brightness and purity, and the formulated ink will be very bright and bright, and it will be closer to the red, green and blue in nature. The true color of the. The ink with the standard color is dark in color, inaccurate in hue, and not bright enough, because the standard color ink itself is a mixed color, so the spot color ink can not meet the three attributes of the ink.
Answer: (1) The tension of the four screens is the same (2) The screen is cut in the same direction (3) The size of the screen is the same size (4) The screen positioning is consistent. (5) The hardness of the scraper is the same (6) The angle between the scraper and the substrate is the same (7) The scraping pressure is the same (8) The scraping speed is the same.
Answer: Under normal circumstances:
Available formulas: 2d + M. or 3d (M = d) where d is the diameter of the screen mesh. M. The width of the hole for the wire mesh.
Answer: 12034(T) Wire Mesh d=34 μm. = 45 μm Formula: 2d + M 2 × 34 + 45 = 113 μm Reproducible line width or dot diameter of 113 μm (ie 0.113 mm) can be printed on 12034 (T) screen
When M. When >d (M+d) 2M. +d is (45+34) (2×45+34)
Dark tone point 79u High light point 124u
Because people often stay in front of the computer for a few hours or even longer, it has a great impact on vision and health. This underscores the need to choose a good home computer desk.
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