Design And Construction Principle Of Screw In Plastic Sheet Production Line
Design and Construction Principle of Screw in Plastic Sheet Production Line
Plastic Sheet Production Line feed area: fixed screw groove groove deep, its function is responsible for preheating and plastic solid conveying and pushing. It must be ensured that the plastic begins to melt at the end of the feed section - that is, to preheat to the melting point. (PA, POM, PE, PP, CA) of about 48 ~ 58% L, plus glassy nature of about 45 ~ 55% of the non-crystalline (AS, ABS, ps) L.
Plastic Sheet Production Line compression area: tapered screw screw groove deep, its function for the plastic raw materials melting, mixing, shear compression and pressurized exhaust. Plastic in this paragraph will be completely dissolved, the volume will be reduced, so the design of the degree of compression is very important. (PA, POM, PE, PP, CA) of about 22 ~ 32% L, plus about 28 ~ 40% L of glass, , Heat sensitivity (PVC) 100% L.
Plastic chip production line metering area: screw screw groove fixed groove deep, the main function of mixing, melt transport, measurement, but also must provide sufficient pressure to maintain the uniform temperature of molten rubber and stable flow of molten plastic. (PA, POM, PE, PP, CA, etc.) of about 48 ~ 58% L, plus about 45 ~ 55% glass, and the proportion of non-crystalline (AS, ABS, PS) L.
Although the Plastic Sheet Production Line screw can be functional or geometric appearance to distinguish, but the actual plasticization process, the overlapping function of each section, it is difficult to distinguish between the interval. The study of plastic screw, nothing more than want to: improve the role of cutting and mixing, improved uniform mixing, improve the plasticizing capacity, improve the melt temperature uniformity. When the depth of the feed section deepened the greater the amount of deep, but the screw required greater torque; feed segment depth is too shallow, the amount of delivery is not enough, compression ratio is insufficient. When the measurement section is too deep, the compression ratio is insufficient, the required feeding power is large; too shallow when too easy to burn and burn. The average tooth depth is about 0.03 to 0.07 times the screw diameter. Therefore, plastic plastic screw has the function of conveying, melting, kneading, compressing and measuring, and plays a very important role in plasticizing quality.
New Plastic Sheet Production Line and production line in the future market will be high technical content, the direction of price reduction. Domestic Plastic Sheet Production Line is now basically tapered twin screw extruder and single screw extruder-based, more mature technology, the market is also the largest sales, but the general specifications of such products have been oversupply, can only maintain the peak of the market Period of about 50% to 60%.
Plastic chip production line in the future focus on the development of parallel to the twin screw extruder, suitable for large extrusion molding extrusion. Parallel to the same twin-screw extruder to the sixth generation, the seventh generation of high-speed, large aspect ratio direction. Single screw extruder development direction is large diameter, large diameter ratio, exhaust smoothly. In fact, the single screw extruder is a low-power, low-cost models, as long as the technology properly, it is basically able to achieve the effectiveness of twin-screw extruder, such as the United States is now using the Plastic Sheet Production Line is mostly single The screw, due to the high technological content, replaces the twin screw extruder.