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Everwide newsletter No.398


Experiment § Adhesion sheet glue - improve T-peel strength

Carbon fiber composites are subjected to stress at different angles, so each workpiece needs to consider the angle of the prepreg stack, the number of layers, or a certain specification of carbon yarn and weaving. In addition, the adhesive adhering to the carbon fiber workpiece is also very particular and must consider both shear and peel strength. A common specification for evaluating the latter is ASTM D1876-08: Bend a metal specimen into a 90-degree L-shape (Figure. 1), sandblast coarsening and cleaning, and then cure with an adhesive sheet. The specimen uses different stretching speeds to simulate slow and fast destruction patterns. Figure 2 shows that the maximum force occurs in the early stage of failure, and the higher the value, the better the wetting and fluidity of the glue, and the more likely it is to spill. The stripped specimens also correspond to their data (Figure 3, 4). We developed a new adhesive and maintained the original glass transition temperature Tg, which also performed well in the T-type peel strength (Figure 5): the average strength value increased, and the fracture value extended backward, proving that the glue has the toughness to resist stress and slow crack growth. If you are interested in this product, please get in touch with us.

—Author: Mr. Rong-Xin, Lin

 

Activity § Environmental Movies

For this year's movie viewing, we chose " Good Morni MIT." The film, which tells the story of the pepper fish and the researcher (Figure 1), was shown twice at China Cinema and was attended by 180 friends (Figure 2-4). Pepper fish are amphibians left over from Taiwan's ice age, infested in high mountains, prefer cold, and face threats to survival under global warming and habitat destruction. In the documentary, the researchers sacrificed their dedication, which deeply moved everyone. The contrast is with the garbage in the mountains, reminding us to take them down the mountain (Figure 5)!

 

Knowledge § Why are epoxy resins for LEDs often dyed blue?

The penetration rate of epoxy resin in the blue light part is slightly worse, so it appears a very pale yellow. Formulators often cover this yellow color with very little blue pigment, making the resin less colorless after curing. This method reduces the penetration rate of wavelengths other than blue, which can be concealed from human eyes and not from the instrument. If the resin turns yellow after aging, it will mix with the added blue to produce strange colors, such as a very light green. From this point of view, " bluing" to suppress the yellowish color cast is not feasible for all occasions.

 

Living § Recent experience in management learning

When I first joined the company, there were only more than 60 people, and since then, the number has increased year by year, and now there are more than 180 colleagues. Management books say that every additional person adds an order of magnitude of interactions, and it is. The most direct way to reduce variables is to simplify the work and define all actions, that is, only plug the piston responsible for plugging the piston and lock the lid only the lid, so that the output may meet the expectations. But even if it is so extreme, everyone's emotions in the face of things are different, and people are still the biggest variable because we are not robots after all. With the increasingly complex process, the simple use of systems or guidelines is gradually insufficient because there are always omissions and imperfect guidelines. With the company's support, we started a series of "communication" activities. Whether an external lecturer comes to the factory to discuss the activities or internal publicity documents (such as internal bi-weekly newspapers, senior sharing articles, etc.) They aim to reduce the information gap between colleagues and be aware of each other's perspectives. These activities made me realize what the book says: "Company management is very similar to riding a horse; pulling too tightly, the horse will not move, and if it is too loose, it cannot be controlled." How do you get a good grip between elastics? It takes patience and constant trying! In the process, you must strain the horse's temper to prevent falling from the horse and even have the courage and perseverance to fall off the horse and get up again."

— Author: Mr. Jinn-Lei, Chen


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