JINFENG PELLETIZING KNIFE TECHNOLOGY
A wide range of the metal-ceramic composites pelletizing knives produced by our company.
Metal-ceramic composite pelletizing knife
PELLETIZING KNIFE MUST HAVE THE FOLLOWING CHARACTERISTICS
Pelletizing knife can effectively work with fixed knife (granulation die plate) under water at 50 ~ 60 ℃.
Hardness of pelletizing blade must be HRC 3-5 lower than that of the cutting surface of die plate so that it can reduce the wear of the die plate.
It should have high temperature resistance, corrosion resistance, cavitation resistance and wear-resistant properties.
It should have a lower affinity to the molten plastics, i.e. uneasy to stick a knife.
Pelletizing knife should not be uneasily broken under abnormal condition.
CHOICE OF PELLETIZING KNIVES
With the increasing grades and extending melting index of the plastics, not only smooth die plate granulation surface, sharp edge and small gap between cutting surface and knife blade are required, the sharpness of pelletizing blade is also strictly required in the granulation process of high melting index plastic.
In order to adapt to the production requirement of high melting index plastics, the following measures should be taken for the pelletizing knives:
When the cutting surface of die plate is very flat and the cutter runs with it easily, metal-ceramic composite pelletizing knives can be used. The edge width should be controlled below 2.5mm.
When the cutting surface of die plate is not very flat, instrument steel with composite coating or fused composite pelletizing knife may be used.
Adjustment of the hardness of the pelletizing blades makes them more suitable with the hardness of cutting surface of the die plate. Reducing the hardness of cutting edge of granulation knife to HRC 7-9difference with the hardness of the granulation part of die plate to ensure that the wear of die plate is lower than that of the cutter.
