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Everwide Newsletter No.288


Experiment § Protective adhesive for wire mesh and steel plate

Many processes use screen printing or stencil printing. For example, printing the ink on the packaging bottle or printing the solder paste on the PCB. However, what less people know is the manufacturing process of the stencil or steel plate. First, use a stretching machine to spread the wire mesh or steel plate with a fixed tension. Then use super glue to stick them together with the frame in the stretching state. The exposed parts of super glue, such as the screen and the front of the frame, the steel plate and the side of the frame, are often coated with a protective glue made of epoxy resin. After the customer uses the plate to print, it will be cleaned with a solvent. Furthermore, super glue that is not protected by resin will be swelled by the solvent and lose its adhesion, resulting in damage to the plate. Generally, there are several requirements for super glue: 1. There is proper gel time after mixing A and B; 2. It can cure and resist solvent in the next day; 3. Must have good anti-solvent properties; 4. It needs a little flexibility to endure the deformation of the wire mesh or steel plate. Sometimes the solvent used by the customer is very special, so the general resin cannot withstand it, therefore the protection effect is not good. We can develop specific protective glue for special solvents, so that the plate has the longest service life.

─Author: Tung-Chiao, Yang

 

Activity § Image video recording

At the end of this year, we invited professional photographers to come to our factory to shoot image video, which will be used on websites, exhibitions, and catalogs. The responsible personnel planned carefully beforehand, did a lot of communication, and also drew up a script for the composition. During the filming, everyone cooperated with each other to perform. Although we were a little shy, it was an experience we had never had before. The film is currently in post-production, and it is expected to present every corner in Everwide. It will show our professional image and product value, and let customers know us better. I also believe that the film will let everyone gather a momentum of "Come on! Towards the future".

 

Knowledge § What is loss tangent?

Loss tangent is usually represented by tanδ. Tanδ = ε”/ε’ =Dielectric loss/Dielectric constant. The dielectric constant reflects the polarization of the medium and the ability to store charge; Dielectric loss reflects the dielectric polarization and energy consumed by dielectric conductivity. In the AC electric field, tanδ=the energy lost by the medium in each period/the energy stored by the medium in each period. From the point of view of molecular structure, a material with a stronger polarity will have a larger tanδ, which will easily generate heat when working; The tanδ of non-polar materials is relatively small, so it is more suitable for insulating materials. The higher the frequency of the electric field, the more important this feature is. For example, the insulating layer of high-frequency cables use non-polar PE instead of polar PVC. Since if PVC is used to make insulating layer, it will generate heat more easily than PE. Measuring tanδ is also used to judge the change of material insulation: In the application of electrical equipment, the decrease in insulation capacity will be reflected in the increase in tanδ. Therefore, this value can be used to monitor the performance of materials and equipment, such as damp, contamination, aging, etc.

 

Living § Illusion of intuition

Someone once said: "We know what we know"; "We know what we don't know"; "We don't know what we don't know." We don't know what we don't know, and we are in an age where knowledge is readily available, so we intuitively control everything. However, this is actually an illusion. The intuition that we think we know will be further amplified in the group. Psychologists pointed out: Intuitive thinking in a group will infect each other and become more consolidated. Because if an individual does not agree with the beliefs of the group, it means defying our relatives and friends, so it is easy to become a common understanding. The problem is that once each group insists on its own prejudice, the conflicts between groups are difficult to resolve. Cyber bullying, populist intervention, and netizens' trials are showing that this kind of "quick" intuition has been out of control, so the harm of using intuition to form public opinion and leading behavior is gradually being reflected on. Human beings have another "slow" way of thinking, which has the characteristics of questioning, dialectical, and comprehensive consideration. "Slow" thinking will put the brakes on the "fast" intuition, doubt whether the appearance has been manipulated, beware of misinterpretation, be more tolerant, and reserve some spaces for "we don't know what we don't know". What’s more, things don't stop happening because "we don't know", and they rarely can be resolved under situation of "we don't know" . Environmental pollution, climate change, regional conflicts, fake news are all obvious examples. Although we live in a beautiful moment, we must also know that the unknown still occupies the majority. Only by reflecting on the "fast" intuition and learning the "slow" thinking can we get out of the illusion we know or think, and then explore the direction we really know.

─Author: Erh-Kai, Yeh


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