â–¼87. UV cold light, how long life? â–¼88. How to use exposure scale? â–¼89. Is the screen too tight and is there any disadvantage? â–¼90. What is wrong with the net stretching too loose? â–¼91. How to measure tension? â–¼92. What kind of stretch angle is the worst? â–¼93. Which kind of stretch angle is the most provincial screen? â–¼94. How to dissolve the release powder? â–¼95. Dissolving release powder, with or without solvent, speed up the dissolution rate? â–¼97. Is it fast or slow? â–¼98. Can you brush with a brush? â–¼99. How to apply the screen below 100 mesh? 65 Inch Conference Interactive Whiteboard As a 65 inch conference all-in-one machine, 65 inch Conference Interactive Whiteboard, microphones and conference software. The small size contains great momentum, providing high-quality pictures and sound effects for team video conferences. 65 Inch Conference Interactive Smart Board,65 Inch Conference All-In-One Machine,65 Inch Electronic Interactive Digital Board,65 Inch Interactive Digital Board Guangdong Zecheng Intelligent Technology Co., Ltd , https://www.zecheng-security.com
Generally speaking, the service life of ultraviolet luminescent tubes is 1000 hours. Accumulative working time, more than 1000 hours or nearly 1000 hours, the lamp tube should be replaced. Usually the cumulative working time reaches 750 hours, the new tube should be replaced to ensure the sun. Edition quality. (Specifically, the light source it emits needs to be replaced if it is white.)
The exposure ruler is a comparison of the effects of five exposures at a time, selecting the best exposure time. (The company has this equipment and can negotiate with this company)
It consists of five sets of sharpness standard plates and numbers.
The first group was followed by no color filter, the exposure coefficient was 1, and the other four groups were each followed by a neutral gray filter, the coefficients were 0.7, 0.5, 0.33, and 0.25, respectively. Comparison of exposure time.
If the best time is measured on a printing machine, the exposure calculation rule is printed for a certain time, such as 4 minutes when observed, which group is effective, if 0.7 is the best, multiply it by 0.7 is equal to 2.8 minutes is the best, the actual exposure time multiplied by the best factor to get the best print time.
Too much tension, laborious when scraping ink, and tearing the screen easily. (Master the correct tension)
The tension is too small, the springback force is small when printed, and the springback effect cannot be achieved. It is easy to rub the dots and fine lines.
For a small network box, only one point in the center of the screen, medium screen, it is best to measure five points, large screen measure six points.
The screen and frame edges are 5-10 degrees and the plate making effect is the worst.
90-degree angle stretch net most of the material, so the general screen printing accuracy is not high, do not have to use 45 degrees, 22.5 degrees stretch net.
The release powder dissolves slowly in water and cannot be dissolved at one time. The correct method of dissolution should be water multiple times, first dissolve a part of the decantation, then add fresh water, stir and dissolve, then pour it out, so that it can be divided into 4-5 times, and it can completely dissolve completely.
When the stripping powder is dissolved, a small amount of acid can be added, and 1-2 ML per kg of water can effectively accelerate the dissolution rate.
â–¼96. Is latex toxic? Photosensitive powder?
Latex is a basically non-toxic colloid, and the photosensitive powder is also non-toxic, but it cannot be imported.
The speed of coating the photosensitive adhesive should not be too slow, the glue can easily leak to the ink surface, and it can easily cause uneven glue, too fast speed, easy to produce pinholes. The emulsion should be coated at a suitable coating speed. Medium uniform coating is generally used.
Brush can not be used to brush sensitized plastic, one brushing is uneven, and the second is the surface of the brush is not smooth. Can only be hard, preferably coated with stainless steel gluing.
Screens coated with coarse mesh, such as screens of 30 mesh and 50 mesh, often have many pinholes. To compensate for the fact that the number of coarse meshes is difficult to apply, one is that the photosensitive adhesive is thicker and the first coating is used. The printing surface should be scraped back and forth several times to make the screen fully wetted, and then the ink surface should be evenly glued. After drying, on the printing surface, it should be applied 2-3 times in a row, and the speed should be slightly faster.
---Qi Lu Graphic Arts
In terms of camera hardware configuration, the 65 inch electronic Interactive Digital Board uses a 12 million pixel camera and supports a wide viewing angle of 120 degree. It can be used in small and medium-sized office spaces and can incorporate more team members into the video conference scene. 4K high-definition resolution can provide high-quality video images, adding points to the corporate image.
In terms of sound experience, 65 inch interactive digital board has built-in 6 array microphones to bring high-fidelity sound quality, and 65 inch conference interactive smart board can achieve up to 8 meters of remote sound pickup, and can perform accurate sound in every corner of the meeting room. At the same time, in the remote meeting mode, the tablet will locate the sound source so that the speaker will not be able to display the picture, automatically gain the voice, eliminate echo and noise, even if the speaker is far away, the audience can still hear it.