Final mixing and deformation in the hottest extrus

2022-08-05
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Final mixing and deformation in extrusion process

an advanced final mixing process increases the capacity of the internal mixer, reduces the cost and improves the quality by well handling the second stage mixing process

internal mixer and batch mixing process are still the mainstays of today's mixing process. However, because this batch mixing process is never continuous, an independent second stage final mixing process is often necessary, in which vulcanized chemicals are usually added at low temperatures

23 ℃, the saturated water absorption is only 0.5%. It is very common to change the mixture of each batch, and the additional operations in the mixing process, such as the storage, weighing and cutting of master batch, are also the diameter of zigzag support roll: Φ 30mm (standard configuration); Required

vmi AZ extrusion GmbH has developed an advanced final mixing process using transfermix single screw extruder mixing technology (MCTD) and gear pump. The total output of vmi-az shark system is controlled by the operating gear pump for measuring the volume, and the final mixing process is completed by another transfermix extruder. Since the single screw extruder can change the screw speed, the mixing parameters can be easily optimized for each mixture, and the quantitative feeding of chemicals is provided by a feeder that analyzes the weight loss (Fig. 1 and Fig. 4)

Figure 1. Continuous final mixing process of cold feed

vmi-az's new cold feed mixing process reduces the change of the first stage mixing process by mixing some mixtures at the same time (Figure 1)

in addition, the shark system will accommodate a wide rubber belt from the first mixing stage, depending on its unique hydraulically driven feed roller (Figure 2)

Figure 2. Feeding area of shark 120 cold feed rubber filter with hydraulic driven feeding roller

since 2008, two kinds of machines (Figure 1) have been produced in a custom mixer factory. According to our customers' reports, the new technology of vmi-az greatly improves the quality (vulcanization characteristics) of the mixture compared with the old batch mixing process

another option for this new process is the hot feeding method, in which the rubber belt is directly fed to the shark MCTD extruder by the film cooler or twin-screw extruder (TSS) (Fig. 3). "There are many kinds of products in this industry

Figure 3. Final mixing process of hot feeding

when this hot feeding method is used, it is directly completed in the final mixing process after the first stage of raw material mixing. In particular, the premix package is fed from the side to the shark MCTD extruder by a planetruder extruder gear pump system. The planetruder extruder gear pump system of vmi-az provides high precision when feeding to the shark mixer Degree of chemical feeding, as well as preheating

for both hot and cold feeding systems, a mixture filter can be added to the output port of the gear pump (Fig. 4)

Figure 4. Shark 150

(end) with LIW feeder and exchanger

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