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2018-11-17 Classification of seals for melt metering pumps
Melt metering pump is a kind of positive displacement conveying device, which conveys the flow of melt in direct proportion to the speed of the pump. The melt metering pump provided by Bart is mainly suitable for accurate measurement of melt in granulation, film, pipe and other fields, and its metering accuracy does not exceed (+1%). According to the classification of common sealing forms of melt metering pumps, Bart manufacturers will analyze and interpret for you in detail below. 1. Axial end-face mechanical seal: This seal has the advantages of simple structure, but it is easy to superheat
2018-11-07 Three sealing types of melt metering pump
Mechanical seals, packing seals and spiral seals are the most common seals for melt metering pumps . However, because of the high melt temperature, the deformation of springs and tine rings and the presence of impurities in the melt, mechanical seals have short service life, generally about half a year, and high cost. The packing seal is fast due to the wear of the packing and the axle sleeve, and it needs constant pressure packing. Therefore, mechanical seals and packing seals will result in increased maintenance workload and frequent replacement. Because polymer processing is generally conti
2018-10-29 Use of melt pump for recycling waste plastics
However, on the one hand, plastic recycling costs a lot of manpower and material resources, on the other hand, the recycling channels are still blocked, and the value of recycling is suppressed. So for a long time, waste plastics recycling is advocating on one side, but on the other hand, it can not avoid the waste of business. Of course, this is before, now the waste plastics recycling and recycling industry has been refreshed. First of all, countries all over the world, including China, are investing in human, material and financial resources, innovating key technologies, optimizing manageme
2018-10-18 Relationship between extruder extrusion and melt pump speed
The pumping method of the melt pump belongs to the quantitative pumping mode, which is the same as that of the piston pump. The material clamped between the inner wall of the pump and the clearance between the gear teeth is sent to the outlet side as the gear rotates continuously. However, the piston pump can not be used for high viscosity materials pumping, because it will produce the same as the screw yaw turbulent pulsation. Therefore, if we want to improve the extruders performance, we should configure the melt pump . The characteristic of the forward displacement most melt pump is that th
2018-09-30 Melt metering pump routine maintenance
1. During the production and operation of the melt metering pump , the power and torque of the metering pump should be measured periodically, and the abnormal position should be stopped to check its alignment accuracy or adjust the lubrication condition of the coupling. 2. When the components can not be replaced in time due to production reasons and are overused, the power and torque of the metering pump should be measured frequently to avoid the phenomenon of overloading operation device. 3. When the melt temperature is lowered, the control power and torque of the metering pump will increase
2018-09-19 Importance of sealing of melt pumps in PET plant
Melt pump is an important equipment in polyester plant. The seal of melt pump is mostly made of mechanical seal into packing seal. Because of high melt temperature, easy deformation of spring and tincture rings and the presence of impurities in the melt, mechanical seals have a short life of about half a year and high cost. The packing seal is fast worn due to the wear of the packing and the axle sleeve, and it needs constant pressure packing. Therefore, both mechanical seal and packing seal will increase the maintenance workload and change frequently. Dry polyester production is a continuous
2018-09-08 Melt pump reduces wastage of extruders
After a few years of operation, there will be a lot of wear and tear between the screw and the barrel in the extruder, resulting in excessive clearance, melt return will increase, production will be affected and reduced, after increasing the melt pump on the extrusion line, it will reduce the return flow rate and energy loss, which means that the maximum increase can be achieved. The output per unit time of the extruder is worth mentioning that each time the extruder is turned on, there is a longer period of machine discharging, which is a big waste of production costs, especially in some prod
2018-08-31 How much can the extruder and melt pump increase?
Q: how much can the extruder and melt pump increase? Answer: In order to increase the output of the extruder, after adding the batte melt pump , the maximum pressure fluctuation of the extruder is in the pump, which can make the internal pressure of the extruder drop, the shear strength of the melt drop, the temperature curve is gentle, the temperature rise is reduced. Especially after several years of operation of the old extruder, there will be a lot of wear and tear between the screw and the barrel, resulting in excessive clearance, melt return will increase, the output will be reduced due
2018-08-21 How does the melt discharge pump work normally?
How does the melt pump usually work? I believe that the first time to buy a melt pump will be more curious, then with the Haike Xiaobian to learn about the structure of the melt pump and how it works? The melt pump is made up of pump housing, front and rear side cover, gear shaft, sliding bearing and shaft seal. Melt gear pump belongs to positive displacement pump. When it works, it relies on the change of working volume caused by the intermeshing of the main and driven gears to transport the melt. The working volume is composed of the pump body, the cogging of the gear and the bearing with th
2018-08-13 Leakage solutions for chemical pumps during commissioning and normal operation
1. Leakage occurred during commissioning of chemical pumps. The centrifugal force produced by the high speed rotation of the mechanical seal used in the pump after static test will restrain the leakage of the medium. Therefore, after eliminating the failure of the seal between axles and the end cover, the leakage of the mechanical seal is basically caused by the damage of the friction pairs of the dynamic and static rings. The main reasons for the failure of the friction pair seal are: 1) large axial force caused by the evacuation, cavitation and compression during the operation, which separat
