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Everwide Newsletter-No.101


Experiment § OMR-external thermal transfer adhesive application development

The technical application of plastic surface decoration is currently a major issue for the 3C industry to attract consumers. Everyone's established impression of plastic products may remain in low-end applications such as monochrome and low added value. However, in the consumer market seeking innovation and change. Many processing methods can be used to improve the stereotype of plastic products. For example, OMR technology has multi-color, multi-pattern, and even simulation effects. It can transfer complex patterns. In addition, the transfer mold is processed with Hard Coating, which has high production efficiency and high yield in production. The most important thing is It can reduce the problem of environmental pollution caused by hard coating again.

In recent years, the company has devoted itself to developing OMR external thermal transfer adhesive and Hard Coating light-curing resin. In terms of thermal transfer adhesive; it can be used in thermal transfer applications of plastic, metal, and other product shells. This adhesive has a high operating temperature range and can be used with related thermal transfer molding machines for thermal transfer; in Hard Coating, light-curing In terms of resin, you only need to bake the solvent when using this product and wait for the surface to dry. The subsequent related inks and adhesives can be glued on the Hard Coating. Layer, and then UV irradiation is performed after the heat transfer to reach the surface. The effect of curing and height lifting. After curing, the pencil hardness can reach 2H and is resistant to solvent erosion. The entire series of products can be glued by coating or screen printing and has the characteristics of non-sticky rewinding, which is convenient for manufacturers to use in subsequent printing processes. After a series of experimental tests, these products have passed high-temperature boiling resistance, high-temperature and high-humidity, thermal shock, and other tests.

─Author: Mr. Zhi-yu, Huang/Mr. Wei-lin, Zhang, Assistant R&D Engineer, Everwide Chemical

 

Activity § What is GHS?

With the improvement of human knowledge, we often use chemicals to improve our lives. Among the daily necessities, many products are made with chemicals. The melamine incident a few years ago and even the current plasticizer storm showed that human beings are uncomfortable with chemicals. How to protect yourself from chemicals? It is a common question of many people. Therefore, many countries and international organizations have formulated laws and regulations to rigorously regulate the manufacture and use of chemicals and require the development of Material Safety Data Sheets (MSDS) to convey and provide safe use of chemicals and emergency response measures in case of hazards. Nowadays, there is an international harmonization of the GHS system to classify, use, and dispose of chemicals safely to transport, use, and dispose of chemicals safely. GHS (Global Harmonized System) is a global harmonization system for chemical classification and labeling promoted by the United Nations to reduce the health hazards and environmental pollution of chemicals to labor and users and reduce barriers to cross-border trade.

 

Knowledge § What is the principle of thermal conductive glue and thermal grease?

Thermally conductive adhesive and thermally conductive paste are materials used to conduct heat flow between heating elements (for example, power crystals) and heat dissipation elements (for example, heat dissipation fins). Because the thermal conductivity of air is only 0.03W/mK, if there is a small gap between the heating element and the heat-dissipating element, the heat dissipation efficiency often deteriorates. If these tiny gaps are filled with relatively high thermal conductivity materials, the heat dissipation efficiency will significantly improve. Generally, the thermal conductivity of organic resin is about 0.3W/mK. Adding alumina to the resin can increase the thermal conductivity to about 1W/mK; the thermal conductivity of adding aluminum nitride is about 2~3W/mK; the thermal conductivity of adding silver Around 7W/mK; the thermal conductivity of diamond added is expected to be as high as 14W/mK.

The most significant difference between thermally conductive adhesive and thermally conductive paste is that the former is used for permanent fixation, while the latter is used for easy disassembly. In the market, sometimes the heat-conducting glue and heat-conducting paste is referred to as heat-dissipating glue and heat-dissipating paste, which should be a wrong concept. Because the function of these materials is to "conduct" heat, the "dissipation" of heat depends on the heat dissipation mechanism.

 

Living § Answer: How can a 50-gallon empty bucket collapse by itself?

We prepare a clean 50-gallon large gasoline tank, fill the tank with about three liters of water, and cover a small fire with bricks and branches on the side, just like camping in the wild.

Place a 50-gallon gasoline tank on the brick and heat it until the water in the tank heats up to produce white smoke for about three minutes. Ask an adult to put on cotton gloves for help. Take a special tool to lock the bottle cap tightly. The water pipe is aligned with a large 50-gallon gasoline tank to water and extinguish the fire. The water in the gasoline tank turns into steam due to heating. The haze will drive most of the original air in the container out of the bottle mouth during boiling. At this time, water vapor will fill the entire container. We tightly seal the bottle's mouth and cool the airtight container. The water vapor in the container turns into tiny water droplets due to the cooling effect and drips into the liquid at the bottom of the bottle. There is nothing in the place initially occupied by water vapor; those places Are close to vacuum. When the space inside the container becomes a vacuum, the atmospheric pressure outside the container squeezes the container.

If the top of the large gasoline can is not tightly sealed, the flattening of the can will not be noticeable. During our first experiment, the gasoline tank was not deformed at all. The first intuitive reaction was that the scientific video must be fake, but the careful kid turned off the tap of the water pipe and looked closely at the gasoline tank. He heard the gasoline accidentally. There is a sound of air leaking from the mouth of the barrel. To prevent the experiment from failing again, we replaced it with a new gasoline drum and burned it again before the experiment was successful.

This thrilling process also tells us that the experiment must be investigated profoundly, and scrutiny will succeed. If the sealing process of the bottle cap is very tight and smooth, even a thick gasoline drum will flatten with a loud noise in an instant. The force of atmospheric pressure is fantastic.

─Author: Ms. Miao-ling, Lin, R&D Engineer, Everwide Chemical




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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