During the production process, the final polyvinyl alcohol precipitate produced by saponification must be pressed and dried to obtain the final product. Polyvinyl alcohol is more viscous and gel-like. The evaporation rate of surface water during drying is much faster than the migration of moisture inside the material to the surface of the particles. The migration of moisture is the limiting part of the drying speed. The heat required for this type of material is not large, and the drying speed is very slow. In general, direct drying with hot air is not suitable for the drying of such materials.
At present, most manufacturers use a vacuum rake dryer to dry polyvinyl alcohol. Vacuum rake dryer only jacket is the heat transfer surface, plus the material can not fill the entire cylinder, so the jacket area is only 60% can be effectively used, which led to a very large volume of vacuum rake dryer, occupying space Large, increasing the investment in civil engineering; the movement of materials in a vacuum rake dryer cannot maintain a strict first-in, first-out principle. There are dead spots and stagnant zones, which can cause the retained materials to be heated and deteriorated and discolored for a long time.
Hollow blade dryers are improved products for vacuum rake dryers. The vacuum rake dryer can handle a wide range of materials, but most of the hollow blade dryers can also handle materials that can be processed by the vacuum rake dryer. The main improvements are:
1. Change batch operation to continuous operation;
2, improve the utilization of the heat transfer surface; reduce the equipment volume;
3, the heat transfer surface and the material full contact, update, uniform heat transfer, shorten the processing time, reduce the material for a long time heat deterioration;
4. The flow path of the material in the dryer was changed, the microscopic spiral forward, the macroscopic piston flow;
5. The equipment is easy to clean when changing material types.
Due to the characteristics of the hollow blade dryer, manufacturing level and the strength of the factory, Sanmenxia Pakide Drying Engineering Co., Ltd. won the bid for the equipment selection and bidding of a polyvinyl alcohol manufacturer in Shanxi Province, and provided a large-scale hollow blade dryer for the drying of polyvinyl alcohol.
Aluminum Die Casting Automobile AC Compressor Comp FEATURES:
During the process of die casting, molten metal is injected into two parts of a shape (the die), which are stuck together. The metal is injected under high pressure. After it has cooled, the two parts of the die come loose and the part is removed. Because the same die is used again and again, each part comes out looking exactly the same. The process of designing the die is the only technically difficult part of the operation. A lot of factors have to be considered to make sure that no air gets trapped inside the molten metal when it is injected and calculations on the draft angle have to be made to make it possible for the part to be ejected easily. This process is used in almost every industry in the world and it is unlikely that you are not surrounded by items right now that have been created through a die casting process.
• Strength and weight – Thin wall castings of die cast Automotive Parts are stronger and lighter than those possible with other casting methods. Plus, because die castings do not consist of separate parts welded or fastened together, the strength of automotive components after die casting is that of the alloy rather than the joining process.
• Multiple finishing techniques – Die cast automotive parts can be produced with smooth or textured surfaces, and they are easily plated or finished with a minimum of surface preparation.
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Zheke Mould Technology Co. Ltd. , https://www.zkdiecasting.com