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EVA black masterbatch dispersion is not uniform how to do?

Time: 2021-05-28 15:07:57

Author: Dongguan Tereal Plastics Factory

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A few days ago a customer sent samples, encountered EVA black masterbatch dispersion is not uniform, the customer sent over the sample is carbon black content of up to 40%, dispersion with EVA wax, pu...

A few days ago a customer sent samples, encountered EVA black masterbatch dispersion is not uniform, the customer sent over the sample is carbon black content of up to 40%, dispersion with EVA wax, pulling the strip is sometimes very brittle, sometimes broken, so that the carbon black dispersion is not uniform, the use of a twin-screw, high-mixing machine pre-mixed into the hopper, the temperature of 160, 165, 170, 175, 180, the head of the machine. 175. What should we do to solve it?

EVA黑色母粒

Think of the following solutions


1, increase the amount of eva wax  


2、Decrease the temperature by 10 degrees  


3, reduce or increase the speed.


Material stuck in the feeding port is a bridge, combined with previous experience to think of some methods, and share with you:


1, dry the material to do, if the material with wet, it will first melt in the mouth of the material, but the melting is not complete, so it will be squeezed there not to go down, sun-dried material is easier than the wet material into. 


2, the mouth of the material to reduce the temperature, or even very low, such as 100 degrees, in this case. Material is not first melted before going in, but directly squeezed in, by the power of the screw, rather than heat. The disadvantage of doing this is a long time to do material, if the screw damage is relatively large.


3, with the broken screw connected to do, the diameter of the front of the cut, slightly changed than the back of the small point, the gap is larger, but also easy to feed.


4, to increase the feed opening, if you are a long time to do this kind of material, you can cut the feed opening larger. Of course, the light cut does not mean that you can feed more, you can add mixing equipment, can refer to the PS foam end material production equipment.


5, change the motor disk, the diameter of the rotating disk, so that the screw speed is faster, disguised in the material is not dissolved before it stirred in. The disadvantage is to be careful to stir the screw broken. After the speed is fast, we should adjust the temperature in the back of the heating area, otherwise the screw's back force is too large.


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