尹人香蕉久久99天天拍久女久,国产在线高清伦免费理视频,精品久久久无码人妻字幂一本一本久久A久久综合精品蜜桃,国产亚洲无码一路线二路线,久久99精品九九九久久婷婷日日碰狠狠添天天爽,国产又黄又大粗的,2021久久精品99精品久久 ,国产精品无码久久AV

PVC pipe production line features:

Mixture: (1), raw material is the PVC stabilizers, plasticizers, antioxidant and other accessories, scale, technology has mixed with high-speed machines, materials and machinery from friction material temperature of heat setting process, then the cold mixing machine material reduced to 40-50 degrees; So you can join the extruder hopper.

Part (2), extrusion machine: this machine is equipped with quantitative loading equipment, make out in and add the shoes to match, to ensure that products stable extrusion. Due to the characteristics of the conical screw, charging period has larger diameter, the material of the heat transfer area and the shear velocity is large, is advantageous to the material plasticizing, metering section of the screw diameter is small, reduces the heat transfer area and the shear rate of melt, can make the melt extrusion under low temperature. Screw within the barrel rotates, the plasticizing PVC mixture into the nose, so as to achieve compaction, melting and mixing homogenization; And achieve the purpose of the exhaust, dehydration. Feeding device and the screw driving device adopts frequency control of motor speed, which can realize synchronous speed.