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Everwide Newsletter No.111


Experiment § Is the LED UV light source good?

LED lighting has become a trend, and LED UV point light sources have gradually expanded. Compared with traditional mercury lamps, LED UV point light sources have the following characteristics: 1. No heat. 2. Single wavelength. 3. The outlet energy of the point light source reaches 500mW/cm2, which is ten times that of the mercury lamp. 4. The life span can reach 20,000 hours, while the life span of traditional bulbs is only 3,000 hours. But the advantages are also disadvantages: 1. No heat: the polymerization speed of the glue will slow down due to the low temperature of the equipment. 2. Single wavelength: Many plastic materials will be added with ultraviolet absorbers so that UV light cannot penetrate the material. In this case, the UV glue needs to use a visible light initiator with a mercury lamp with multiple wavelengths to solve this problem. However, the single-wavelength UV light source lacks visible light, which cannot be overcome with visible light initiators. 3. The intensity of point light sources declines with distance and cannot replace surface light sources. 4. Because UV is "non-visible light", the LED's UV point source does not seem to have strong light, but in fact, the intensity of ultraviolet light is stronger than that of mercury lamps, and the potential danger is higher than that of mercury lamps. Mercury lamps have high-intensity visible light, which makes people consciously wear goggles. The visible light of LED UV is only 5 mW/cm2, which makes it easy for people to ignore its danger. Actually encountered phenomena in application: 1. P+R glue FP4274, the adhesive strength of the traditional mercury lamp through the conveyor belt can make the silicone material break, and the LED UV needs to be heated and cured to have the same effect. 2. White UV ink FT2861, when using LED UV, the curing is incomplete, because the white pigment TiO2 contained in it will block the light. Therefore, the single wavelength of LED UV does not generate heat, which is an advantage and a disadvantage. Things are dead, but the method of use is alive. Don’t just think it’s right just because people say it’s good. The devil is hidden in the details, which is behind the glamorous surface.

─Author: Mrs. Xu-Hui, Li, R&D Engineer, Everwide Chemical

 

Activity § Use Google Map to find Everwide Chemical

After a month of hard work, we finally registered Everwide Chemical on google map. In order to facilitate customers to search the map when they visit, we specially cooperated with google Maps to register the link of Everwide Chemical on google map. In the future, you only need to type in Everwide Chemical in the search engine of Google Maps, you can easily search for our location. Of course, you can do your own route planning very conveniently to ensure that you will not get lost! Haven't you seen the beautiful garden of Everwide? Next time, you can try Google Maps to search for Everwide and explore the secrets of the garden!

 

Knowledge § Is there any relationship between the viscosity of the adhesive and the strength of the adhesive?

Many customers express the adhesive strength in colloquial terms, calling it viscosity. In fact, viscosity and adhesive strength are two different things. Adhesive strength is affected by many variables, viscosity is one of them, but it is not an inevitable factor. On the basis of the same chemical structure, an adhesive with a low viscosity has a better ability to penetrate the surface of a substance and may obtain a better adhesive strength. As for how high the viscosity must be in order to make a big difference in permeability and cause a significant decrease in adhesive strength, different compositions are different, and it must be verified by experiments. Generally speaking, when the viscosity is so high that thixotropy occurs, the penetration ability will be very poor, and the adhesive strength will be worse than that of the composition without thixotropy. However, there are a few examples to the contrary. When the viscosity of the adhesive is too low, the thickness of the adhesive gel becomes very thin, resulting in poor adhesive strength.

 

Living § The end of the space shuttle era

I was born in 1968, the next year an astronaut will land on the moon. Against this background of time and space, the most advanced technology I recognized when I was in elementary school was the Apollo rocket. I am very interested in the structure of the rocket, the steps of landing on the moon, and the story of space. When the United States launched the Space Shuttle in 1981, the huge impact on our generation was a brand-new structure, a brand-new mission, and a brand-new imagination, at that time I was in the first grade of junior high school. It seems that the vocation of middle school students is to be admitted to high school, and high school students are to be admitted to the university. Now it is impossible to imagine the pressure of entering a higher school. A cousin of mine was in the second grade of high school. In order to encourage him to study, my third uncle cut out the color pictures of the space shuttle launch in the magazine and gave him the inscription beside the picture. The general idea of the inscription in my memory is: the space shuttle needs to get rid of the shackles of gravity, just like we want to get rid of all kinds of shackles in life. As a kid at the time, I interpreted it as being able to get rid of the shackles when I was admitted to college. I always imagined that there would be an amazing sight on the day that belonged to me. Thirty years have passed in a blink of an eye, and I found that there are still many constraints in life. Only then did I realize that I didn’t think deeply enough, and I oversimplified the meaning of my uncle: in fact, there is still a variety of work to be done after the space shuttle takes off and they need to undertake different responsibilities at different stages. In July 2011, after the space shuttle performed its last mission, the United States terminated its 30-year space shuttle program. For me, this is the end of an era, and perhaps the beginning of another experience.

─Author: Dr. Ming-Xu, Li Everwide Chemical

Left: The Apollo 11 rocket was launched on July 16, 1969. Picture source: http://zh.wikipedia.org/wiki/Apollo_11

Right: The Columbia Space Shuttle launched on April 12, 1981, source of image:




Thriving 是奮發向上的意思,是永寬的電子報 內文編輯: 李姮蓉 版面設計: 曾文政 電子郵件:service@everwide.com.tw


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