Wang Caifeng, former official of the Ministry of Industry and Information Technology of China, said at the meeting on the 28th that all the preparatory work for the China Rare Earth Industry Association has been completed and is awaiting approval from the relevant government departments. It is expected to be officially listed before the May 1st next year. The association will include 93 company members, including major domestic rare earth mining and production companies. She also expressed the hope that the association will play a role similar to the China Steel Association in the future, exerting certain influence on the international pricing and export quotas of rare earth products exports, and leading the healthy and orderly development of this industry.
The Global Times reporter noticed at the meeting that the seminar was actually small in scale and only one day in the session. However, the people who heard the news were far more than the organizers expected, and they had to temporarily add several rows of seats in the venue. Many of the attendees who are coming from are journalists or employees of foreign media stations in Beijing.
On the same day, the Ministry of Commerce announced that the first batch of rare earth export quotas in 2011 was 14,446 tons, which caused criticism from the international media. Reuters said that this figure is about 11.4% lower than the first batch of quotas in 2010; AFP said that Beijing is still strengthening control of rare earths, shutting down heavy polluters, cutting overseas export quotas, and raising export taxes on rare earth products. In this regard, Wang Caifeng said that this is a disregard for the facts and unfairness. For decades, China has provided the world with rare and high-quality rare earths. She said: "At the international level, we often say to foreign rare earth counterparts that you should thank China for the right thing. Now it is also a matter of fact that it is too unreasonable for China. This is not conducive to the long-term development of the international rare earth industry." â€
Velcro disc is an abbreviation of sandpaper, a customary name. Velcro disc is also sandpaper. It is a conversion product of sandpaper. Its shape is a positive circle. It is flocked with sandpaper roll , and then put it on the stamping machine for stamping with *** circular die. The stamped product is velcro disc.
Sanding disc can be divided into two types according to the lamination: back glue disc sand and back velvet disc sand (also known as self-adhesive disc sand and brushed disc sand). The fluffed disc sandpaper can be non hole fluffed disc sand paper or hole fluffed disc sand paper. The velcro disc with holes is convenient to discharge waste chips from the holes when grinding objects, so as to improve the grinding efficiency. There are other classification methods. For example, according to the size, the common disc sands are 100mm, 115mm, 125mm, 150mm, 180mm and 215mm in diameter, and the diameter area of disc sands that can be used is 23mm --- 235mm.
According to the sand surface of disc sand, the common ones are white sand disc sand, red sand disc sand, yellow sand disc sand, black sand flocking disc sand, blue sand disc sand, green sand disc sand, grid flocking sand. And classified from the raw materials of disc sand paper, velcro discs can be divided into aluminum oxide velcro disc, silicon carbide velcro disc and zorconia velcro disc. Aluminum oxide velcro disc can be divided into ordinary aluminum oxide velcro disc, calcined aluminum velcro disc and so on. The particle size of disc sand is usually divided into 40# 60# 80# 100# 120# 150# 180# 220# 240# 320# 360# 400# 600# 800# 1000# 1200# 1500# 2000#.
And the application of disc sandpaper is extensive. From the space shuttle to the mobile phones and computers we use, disc sandpaper is used in the production process. Some parts of the space shuttle need to be finely polished with disc sandpaper, and the fuselage needs to be polished with disc sandpaper before spraying paint, so that there will be no paint peeling. Take our common notebook computers for example. If they can have such a mysterious appearance color, they can't lose the fine grinding of disc sand. It is mainly used for polishing, furniture, hardware, electronic accessories. At the same time, the efficiency of disc sandpaper grinding products is very high, which is faster, more convenient and less loss than conventional hand sandpaper grinding; However, the round sand disc also has some shortcomings. At present, with the gradual improvement of the requirements for the surface finish of the ground workpiece, the requirements for the base of the round sand are also higher and higher.
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