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Everwide Newsletter No.207

Experiment § Measure the depth of curing of UV glue.

Different light-curing resins have different curing depths in different light sources. So it is very important to evaluate the depth of curing. Figures 1, 2 show that the UV glue is poured into the fixture and then cured with the set light conditions. Figure 3 is a test piece after curing. The bottom of the fixture is made of black plastic, and the side of the fixture is covered with a glass sheet and black tape to ensure that when the resin is cured, the light only comes from directly above, without the influence of the side penetration or bottom reflection. Figure 4 is to turn the fixture and the test piece over, then you can see that the bottom is not dry. Take out the test piece and wipe off the wet part of the bottom (Figure 5), and then measure the thickness of the test piece with a cursor ruler, you can get the curing depth of the light-curing resin under the experimental conditions (Figure 6). The curing depth of the resin has a great relationship with the wavelength and intensity of the light source: the longer the wavelength, the higher the intensity, the greater the curing depth. Another important variable is the photoinitiator in the resin. A high-concentration photoinitiator will absorb all light on the surface of the resin, and the light penetrating to the bottom of the resin is very few, and the curing depth is naturally not good. On the contrary, although the low concentration of photoinitiator makes the reaction speed of the system slower, more light penetrates to the bottom, so the curing depth is deeper.

─ Author: Miss Chun-Xiang, Ji


Activity § R&D and production

During our production process, there must be quality control personnel on the side to confirm the process and steps, but there are still many opportunities for R&D colleagues to follow the orders on-site. The first experience is that you will be familiar with the entire process during the R&D training stage with an on-site documentary for a week. Then again, when a new product is manufactured on-site for th first time, the R&D department will definitely confirm it. When the process needs to be improved, the R&D department will also study with colleagues in the manufacturing department. If it encounters a more complicated process or requires strict control, the R&D colleagues will also fix the order during production. R&D and document production can deeply understand the product. It is definitely not a "do it at will" in the laboratory to be shipped, it can also reduce the prejudice of the department, experience the difficulties of production, and design better products.


Knowledge § Variables in weatherability assessment

When materials are used outdoors, they will be affected by environmental factors and deteriorate. There are three main environmental factors: sunlight, humidity, and temperature. Since these three variables are different in every place and every period, different materials and different colors respond differently to these three variables. Therefore, the outdoor material aging experiment and the accelerated experiment controlled in the laboratory can be reproducible only under very strict control. In order to reduce these variations, the best way is to experiment with the known materials and the materials to be tested at the same time. Using the experimental data or literature data of known materials in the past as a basis to evaluate the relative differences between known materials and unknown materials, the weather resistance of unknown materials can be evaluated more valuable.


Living § Thoughts on an internship at Nissan Yokohama Plant

This internship trip is to visit Nissan Motor's engine production plant in Yokohama. The internal flow planning of the factory is impressive: we are walking on the gray line and see that many production actions rely on robotic arms, and the personnel is responsible for the stability of the production process. The "unmanned transport vehicle" that assists in moving goods is driving on a black line, with people and vehicles separated and in order. The tour guide told us: "On-site personnel must receive complete education and training, and obtain qualified technician certification before they can engage in production in the factory." In addition to emphasizing production automation and personnel skills, what struck me most was the attitude of Nissan employees: silent and focused. Not only did no one chat, but they were also constantly checking on their own. The daily maintenance records of the machine are also clearly visible. The factory has an actual experience area to showcase the small inventions Nissan employees use to improve their work. Let the visitors do it by hand and experience "doing while learning, learning by doing". During the visit, the guide said: "We want to make a 100% non-breakable car." I raised my hand and asked, "If you make a car that is 100% non-destructive, will others buy a new car? How can you serve customers?" Nissan’s manager replied: “We all know that we can’t reach 100%, but we still set a goal of 100%.,working hard for this goal and we may be able to make a car that will not break 80%, if the goal is set too small, such as "If you want to make a car that is 80% non-destructive," the result will be even smaller, maybe only 50% of the goal." After hearing this, we suddenly realized that we have reached the conclusion that only by challenging high standards can we achieve lofty dreams.

Further reading is

─ Author: Miss Heng-Rong, Li


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