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EVA Common Sense
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Foamy eva Principle:
Compared with polyethylene, EVA reduced crystallinity, improved flexibility, impact resistance, compatibility of fillers and thermal sealing properties because of the introduction of ethylene acetate monomer into the molecular chain. Generally speaking, the properties of EVA resin mainly depend on the content of ethylene acetate on the molecular chain. The higher the content of ethylene acetate (VA content) is, the higher its transparency, softness and toughness will be.
EVA Thermal conductivity (normal temperature) 0.035 Grade HF-1 low temperature bending less than or equal to 20 elongation at break 50 compressive strength 200 tensile strength 150 High energy attraction, low pollution, good anti-shock and anti-skid effect, use temperature-20g 100 tear strength 50, Long service life. Electrical fire-proof grade up to HF-1 level. Is the first choice for home appliances manufacturing.
eva foam sheets Pad is based on EVA foam cotton, single-sided or double-sided coated high performance pressure sensitive adhesive, composite single-silicon or double-silicon detached material, can be used for single side bonding of domestic oil glue or imported double-sided tape, Then use a high-precision die-cutting machine or punching die-cutting machine. Can be punched into circular, square, non-standard shape, adhesive paste, rubber pad and so on according to different requirements.
Mainly suitable for electronics, electrical appliances, high-tech products, home, toys, metal plastics, printing panels and other industries of shock, buffer, anti-slip preferred. Widely used in the prevention of electronic appliances furniture, ceramics, glass, wood, metal and other products to be rubbed and scratched, but also can reduce the noise caused by the movement of objects, make up for electrical appliances, furniture foot uneven, at the same time can play a non-slip, anti-shock, Buffering and many other functions..
Characteristic:
EVA Pad has good flexibility, rubber elasticity and resistance to high and low temperature. It has good use elasticity in the temperature range of -20 ℃ -150 ℃, density 38P-45P, special density 55P-60Pn 75P-80P, error range: ±3P. It is generally measured with a measuring instrument. Technical parameters: specific gravity: 1.6-1.7 breaking force: 5MP.
This article come from: https://hnarts-eva.blogspot.com/2019/01/eva-common-sense.html
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How do I distinguish between copy paper and tissue
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In the market, it is often the case that the tissue paper is sold as a copy paper, but the production standard of the two paper is different, and there is a certain difference in price, so how to distinguish the copy paper from the colored tissue paper sheet?
Method one: check its appearance is smooth, exquisite, have uniform transmittance.
Copying paper is a kind of advanced cultural industrial paper which is very difficult to produce, with fine paper, smooth surface and good transmittance. The process of sheet paper is relatively rough, paper is generally one side light and rough side.
Method 2: To check the physical strength and tear of the paper, the higher the transparency and the higher the quality of the paper.
The paper has good transparency, usually covering up to 6-8 layers, still seeing the presence of transparency, and the extremely good card is up to 12 layers. The tissue paper is thin and soft, and has a certain degree of transparency, but is far from the copy paper.
The paper is very similar to the sheet's appearance at a glance, but in fact, the quality of the sheet is poor and the price is less than that of the copy paper, so the customer must polish the eye to avoid unnecessary loss when purchasing the paper.
This article come from: https://hnarts.hatenablog.com/entry/2019/04/01/181101
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