Warm Global Customers
With China Plastic Machinery
With China Plastic Machinery
The rubber masterbatch granulator is another example of the application of internal mixer and single screw extruder.
The internal mixer can make the rubber more fully compatible and dispersed in the internal mixing chamber. The screw core of the single screw extruder is water-permeable. The screw is low-speed, low-temperature, weakly sheared, and fully dispersed. There is no excessive friction heat, the dispersion effect is excellent, the main machine current is small, and it is energy-saving and environmentally friendly.
The precise temperature control of the rubber masterbatch granulator ensures the low-temperature granulation process. The special isolation agent recovery system effectively solves the dust problem in production, and the added isolation agent will not cause too much waste. The recovered isolation agent can be reused.
The biggest technical feature of the rubber masterbatch granulator: the new process of cold processing preparation is adopted throughout the process, which has a low processing temperature, can prevent the rubber additive from recrystallizing after melting and destroying the original refined additive particle size, and maximizes the "refining and solubilization" characteristics in the formula design.
The material is sent to the double-wrist feeder after internal mixing through the automatic elevator. The double-wrist feeder forces the material to be uniformly added to the main screw. Under the compression and shearing of the screw and the external heating, the material is mixed and plasticized. The temperature and pressure gradually increase, showing a viscous flow state, and pass through the die head at a certain pressure, extruded and pelletized, and finally obtain particles of the desired shape.
Internal mixer----automatic elevator----double-wrist feeder----single screw extruder----air-cooled die face hot cutting die head----release agent addition system----secondary cyclone separator-----release agent recovery system-----extended air-cooled vibrating screen----finished product siloThe agglomerated material of the internal mixer is automatically and flow-processed through the elevator, double-wrist feeder, extruder, pelletizing, cooling, screening, and terminal silo. After the material is mixed, it is forced into the single screw extruder through the double wrist feeder. Water flows through the core of the screw, and the screw is fully dispersed without excessive friction heat. The dispersion effect is excellent, the main machine current is small, and it is energy-saving and environmentally friendly.
1. Check whether the electrical wiring is accurate and whether there is any looseness.
2. Use a megohmmeter to measure the insulation resistance of the motor and cast aluminum heater, which shall not be less than 0.5M¦¸.
3. Check whether the installation of various detection components such as thermocouples and melt sensors is good.
4. The main motor voltage is 380V, and the frequency range is 0-50HZ. The screw speed is 0-130r/min.
5. Add high-temperature heat transfer oil WD320 to the mold temperature controller.
6. Check the lubrication system:
(1) Add lubricating oil to the gear transmission box. Open the top cover of the box and add No. 150 industrial gear oil to the oil level indicated by the oil gauge.
(2) Check the oil circulation system and the oil supply status at each point. After the oil pump is turned correctly, turn on the oil pump, set the pressure relay to alarm when the protection pressure is lower than 0.08Mpa, and then check and adjust the oil volume and injection status of each oil supply point.
(3) Lubricate the single screw thrust shaft with calcium-based grease.
7. Check all upper and lower water pipes and oil pipes. They should be unobstructed and leak-free, and all control valves should be easy to adjust.
8. Manually turn the car to check the transmission system and moving parts such as the screw. If there is no abnormal sound, it is qualified. When the turning direction is viewed from the head of the machine, the screw turns clockwise and the screw rotates for no less than three turns.
9. After cleaning the intermediate silo and hopper (including double-wrist feeding) and confirming that there are no impurities or foreign matter, start the elevator and add materials to the double-wrist feeder.
10. The main machine is cooled with soft water. Open the return water manual valve and press the start button to start the circulation system. Adjust the working pressure regulating valve to make the system pressure reach the requirement and stabilize.
11. At the same time, preheat and raise the temperature. Set the heating temperature value of each section according to the process requirements. When the heating temperature of each section reaches the set value, keep the temperature constant for 40-60 minutes. Then check whether the temperature control meter of each section and the solenoid valve of each zone cooling pipeline are normal before starting the machine.
12. Check the water ring die surface hot cutting system:
(1) Carefully adjust the position of the cutter to ensure that the cutter blade is in good contact with the strip die surface.
(2) Adjust the position of the pelletizing motor, find the coupling position of the cutter shaft and the motor shaft, and maintain good coaxiality and verticality.
(3) Test the cutter to confirm that the cutter is turning correctly. (Clockwise when facing the machine head)
(4) Start the water pump and confirm that the water spraying effect is good.
(5) Start the dehydrator and confirm that the motor is rotating in the correct direction.
(6) Start the drum vibrating screen and confirm that it is operating normally.
1. Start the feeder. Fill the feeding hopper with material before starting the main motor control system. Then turn the main engine speed knob clockwise (note that the knob should be turned counterclockwise to zero before starting the main engine). Slowly increase the screw speed. The speed should not exceed 20r/min when the screw is idling, and the time should be less than 2 minutes. After confirming that the machine is operating normally and the no-load current is normal, slowly start the feeding device, and wait for material to be discharged from the machine head before gradually and slowly increasing the screw speed and the double-wrist feeder speed. When increasing the speed, wait until the current drops and stabilizes before increasing it. And adjust the pelletizing speed in time to make the produced particles meet the requirements. During the speed adjustment process, pay close attention to the host current indicators at any time. In principle, it is better to control the host current to no more than 80% of the rated current. At the same time, pay attention to the operation of all parts of the entire unit, such as noise, vibration, bearing temperature rise, heating temperature, host current and other main operating data must be within the normal range. If there is an abnormal sound, stop the machine in time for processing.
2. Soft water cooling circulation system. Each section of the cylinder cooling pipeline is equipped with a manual shut-off valve and a solenoid valve. The former controls the soft water flow, and the latter is linked with the temperature control instrument to automatically control the soft water on and off. The feeding section cylinder is only equipped with a manual shut-off valve. For materials that have no tendency to melt and accumulate at the feeding port, this section of cooling can also be closed. During the start-up phase, the soft water circulation system does not need to be used. After the main engine runs smoothly, if the test temperature of a section of the cylinder is significantly higher than the set temperature, the soft water system pump can be started, and the bypass overflow valve at the pump outlet is adjusted to control the pump outlet pressure at 0.2-0.3MPa, and then the shut-off valve of the cylinder section to be cooled is slightly opened (not suddenly fully opened), and the temperature change of the section is observed for a few minutes. If there is no obvious downward trend or it drops to a new equilibrium temperature, but exceeds the allowable value, the pipeline valve can be appropriately increased or decreased. This process often requires a certain amount of repetition to meet the requirements. After the valve opening adjustment is determined, it is generally not necessary to adjust it for the same material operation. The water temperature of the soft water tank is controlled by adjusting the water volume of the water tank cooler.
3. After the test run, return to 50%-80% load for trial production for 48 hours, so that all moving parts can be "run-in" before being put into normal production.
Applicable to the production of various high-filler masterbatches such as rubber masterbatch, sulfur masterbatch, calcium carbonate filling masterbatch, woven bag filling masterbatch, flame retardant masterbatch, carbon black masterbatch, etc.
Rubber is generally considered to be a general term for all polymer elastomers. There are four main forms of rubber: raw rubber, plasticized rubber, mixed rubber, and vulcanized rubber. In addition, there are reclaimed rubber, pure rubber, masterbatch, etc. Raw rubber refers to rubber that has not undergone any processing; plasticized rubber refers to rubber that has only been plasticized and has certain plasticity requirements; mixed rubber refers to rubber that has been added with compounding agents and mixed; vulcanized rubber refers to rubber that has been added with compounding agents and mixed evenly and sulfurized. Commonly used rubbers include: natural rubber (NR), styrene-butadiene rubber (SBR), butadiene rubber (BR), nitrile rubber (NBR), ethylene-propylene rubber (EPR), and butyl rubber (IIR).
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