Rubber and plastic internal mixer 35 liter internal mixer 110 liter internal mixer

Lift internal mixer
Liter internal mixer
Upper bolt pressure
When mixing in the internal mixer, the rubber material must be subjected to a certain pressure from the upper bolt. It is generally believed that the pressure on the top bolt should be appropriate. When the rotor speed is constant, further increasing the pressure has little effect. When the mixing capacity is insufficient, the upper ejector pressure cannot fully exert its effect. Increasing the upper ejector pressure can reduce the unfilled space in the closed chamber and increase its filling degree by approx. As the capacity and rotational speed increase, the pressure on the top bolt must be increased. Increasing the pressure of the upper ejector will accelerate the heat generation of the rubber during the mixing process and increase the power consumption during mixing. Rotor structure and type The geometry and size of the rotor working surface determine to a large extent the production capacity and mixing quality of the internal mixer. There are two basic configurations of internal mixer rotors: shear rotors and meshing rotors. Generally speaking, shear-type rotor internal mixers have higher production efficiency and can quickly feed materials, mix quickly, and discharge glue quickly. The meshing rotor internal mixer has the characteristics of high dispersion efficiency and low heat generation rate, and is suitable for manufacturing hard rubber materials and one-stage mixing. The dispersion and homogenization effect of the meshing rotor mixer is better than that of the shear rotor mixer, and the mixing time can be shortened. Increasing the speed of the internal mixer rotor is one of the most effective measures to enhance the mixing process. The rotation speed is doubled and the mixing cycle is shortened approximately. Increasing the rotation speed will accelerate heat generation, resulting in a reduction in the viscosity of the rubber compound and a reduction in the mechanical shearing effect, which is not conducive to dispersion.
Diameter control
As mentioned above, in order to ensure the size of the outer diameter of the finished cable, in addition to the requirement to control the dimensional tolerance of the cable core, there should be certain requirements in terms of extrusion temperature, screw speed, traction device line speed, etc. The control is guaranteed, and the measurement control of the outer diameter comprehensively reflects the accuracy and level of the above control. In the extrusion unit equipment, especially the high-speed extrusion production line, an online outer diameter detector should be equipped to detect the outer diameter of the cable at any time, and feedback the out-of-tolerance signal to adjust the traction or screw speed to correct the outer diameter. Out of tolerance, tension control required for winding In order to ensure constant tension requirements for winding up at different line speeds and working from empty reel to full reel, it is hoped that the winding and rewinding device has a storage tension adjustment mechanism, or electrically considers constant thread Winding up of speed system and constant tension system, etc.
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Mixing temperature
High mixing temperature is beneficial to the plastic flow and deformation of raw rubber and rubber materials, and is beneficial to the coordination of rubber and solids The surface of the agent particles is moistened and mixed, but the viscosity of the rubber material is reduced, which is not conducive to the crushing, dispersion and mixing of the compound particles. Excessively high mixing temperature will also accelerate the thermal oxygen aging of the rubber, causing the physical and mechanical properties of the vulcanized rubber to decline. That is, over-refining will also cause the rubber material to scorch, so effective measures must be taken during the mixing process of the internal mixer. Cooling measures should be taken but the temperature should not be too low, otherwise the rubber material will be crushed and dispersed. The electrical automation control of the whole machine is a process control requirement that should be met to realize a high-speed extrusion production line. It is mainly the proportional synchronous control of the transmission of the two major components of startup temperature, interlocking working pressure protection and interlocking extrusion traction, and the synchronous control of take-up and traction. Online outer diameter detection and feedback control control single machine and complete machine tracking of components according to various needs. Section 2 Plastic Extruder Screw The screw is one of the key components of the extrusion system of the extruder host. It not only plays the role of transporting plastic, but also plays an extremely important role in the difficulty of plastic extrusion and plastic molding. , so the reasonable selection of screw structure and parameters is an important step in obtaining ideal product quality and output.
Mixing time: Under the same conditions, the mixing time required for mixing rubber materials with an internal mixer is much shorter than that with an open mixer. When the mixing quality is required to be constant, the required mixing time shortens as the internal mixer speed and upper ejector pressure increase. Improper feeding sequence and unreasonable mixing operation will prolong the mixing time. Extending the mixing time can improve the dispersion of the compound in the rubber compound, but it will also reduce production efficiency. If the mixing time is too long, it will easily cause the rubber compound to be over-refined, which will damage the physical and mechanical properties of the vulcanized rubber. It will also cause the thermal history of the rubber compound to increase and scorch will easily occur. Therefore, the mixing time of the rubber compound should be shortened as much as possible. .
Liter mixer
Main parameters
The rotation speed and speed ratio of the rotor, the rotor edge ratio, the production capacity of the wall gap in the mixing chamber and the filling coefficient, the unit pressure power of the ejector bolt to the rubber material.
Internal mixer operation method
Calculate the amount of primary rubber mixing and the actual formula according to the capacity of the internal mixer mixing chamber and the appropriate filling factor. According to the actual formula, accurately weigh the amounts of various raw materials in the formula, and add Raw rubber accelerator, anti-aging agent, solid softener and other reinforcing agents or fillers, liquid softener, sulfur are placed separately and arranged in order on the shelf. Turn on the power switch and heating switch of the internal mixer to preheat the internal mixer. At the same time, check whether the wind pressure, water pressure and voltage meet the process requirements, and check whether the temperature measurement system, timing device, power system indication and record are normal. After the internal mixer is preheated and stabilized for a period of time, prepare to mix the rubber. Lift the ejector bolt and cut it into small pieces. The lump of raw rubber is put into the internal mixer from the feeding port, and the upper ejector pin is dropped. After the rubber is mixed, the upper ejector pin is lifted, and small materials are added. The upper ejector pin is dropped for mixing. Lift the upper ejector pin, add carbon black or filler, and the upper ejector pin is dropped for mixing. Lift the upper ejector bolt, add liquid softener, lower the upper ejector bolt for mixing and debinding, use a thermocouple thermometer to measure the temperature of the rubber material, record the initial temperature of the mixing chamber, the temperature of the mixing chamber and the debinding temperature at the end of mixing, the maximum Adjust the speed of the power rotor to adjust the roller pitch of the open mixer to turn on the power switch to run the open mixer, open the circulating water valve, and then throw the rubber material discharged from the internal mixer to the upper roller of the open mixer. Wait until the rubber material temperature When the temperature drops below ℃, add sulfur and use the left and right cutters twice. When all the sulfur is eaten in and the surface of the rubber material is relatively smooth, cut off the rubber material. Adjust the roller distance of the open mill to the point where the rubber material is thinly passed, make a triangular bag, and pass through the rubber material. Adjust the roller distance to the right, put the rubber material into the roll, wait until the surface is smooth and without bubbles, remove the piece, and weigh the total amount of the rubber material. Mass, place on a flat and clean metal surface to cool to room temperature, affix a label to indicate the rubber formula number and mixing date, and store it for later use. The mixing process test report for each batch of the internal mixer should record the temperature at the start of mixing, the mixing time, the rotor speed, the ejector pressure, the glue discharge temperature, the power consumption, the difference between the mass of the mixed rubber and the total mass of the raw materials, and the type of internal mixer. Note that when starting the mixing experiment, you can first mix a compound with the same formula as the test compound to adjust the working status of the internal mixer, and then formally mix the same batch of compound, the control conditions of the internal mixer and the mixing The time should remain the same.
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