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Calculation method of extruding volume of plastic pvc hose machine


Extruder, whether it is single screw or twin screw, must mention two concepts when it comes to extrusion.
1. theoretical limit of extrusion
2. actual extrusion capacity
The algorithm of theoretical limit extrusion quantity is: through the screw geometry calculation (barrel internal space cross-sectional area-screw cross-sectional area = runner cross-sectional area) and then multiplied by the lead of the large lead screw element in the feeding section and then multiplied by the main engine speed, using the international standard unit, the obtained m_/h is the theoretical limit extrusion under this speed. Quantity.
The actual amount of extrusion does not need to be calculated. Generally speaking, it is measured feeding. The amount of extrusion is the amount of feeding you set. If it’s hungry feeding (rarely because the feed is unstable in practice), it’s necessary to combine the characteristics of the material, such as powder or granule, the fluidity of its solid particles, and the size of the feeding device, but usually the actual extrusion of the solid-state hungry feed does not exceed the theoretical limit. 80% of extrusion
In the design of the feeding quantity, it is usually appropriate for 60% of the theoretical limit extrusion quantity, and it is not necessary to adjust the feeding quantity within a certain speed range of the main engine.


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