プラスチック押出機の選び方

When users use 圧力要件は、部品の設計と機械について慎重に計算されています と カビ, we inevitably need to use plastic extruder
The selection of extruder mainly refers to the following technical parameters:

Screw diameter refers to the outer diameter of the screw thread. Dで表すと, the unit is mm
The length-to-diameter ratio of the screw refers to the ratio of the length of the screw thread to the diameter of the screw, expressed in L/D.
The speed range of the screw refers to the highest and lowest number of revolutions when the screw is working
Motor power refers to the power of the motor that drives the screw to rotate, represented by P
Barrel heating power refers to the electric power when the barrel is heated by resistance, the unit is KW

In the case of the same configuration, it depends on the quality and workmanship

It is best to buy a マシーン to inspect the scale and strength of the factory. I wish you good machinery と 装置
2.What to do if the temperature of the discharge port of the plastic extruder is too high

There is a water jacket of the barrel under the feed opening, one inlet and the other outlet, mainly to prevent the temperature of the barrel from being too high, forming a bridging phenomenon, and there is the right to install the circulating water on the reduction gear box. The function is to prevent Temperature is too high.
If you are a low-pressure pellet, you don’t need to increase the temperature of the hopper too high, so the temperature of the discharge port will also drop. If the situation still does not improve, it is recommended to install a mold temperature controller to keep the temperature of the screw at a constant value.

3.Why is the screw of the plastic extruder broken?

It is necessary to analyze the traces of the broken section in detail. If there is fine metal foam or metal mud nearby, it is caused by long-term friction. Observe whether there is a place where friction may occur around. If the section is clean and new, it may be Caused by a sudden failure.

4.How to calculate the extrusion volume of a plastic extruder

For an extruder, whether it is a single screw or a twin screw, two concepts must be explained when it comes to extrusion capacity:
1. Theoretical limit extrusion
2. Actual extrusion volume

The theoretical limit of extrusion is calculated by the screw geometry (cross-sectional area of ​​the internal space of the barrel-cross-sectional area of the screw = cross-sectional area of ​​the runner) and then multiplied by the lead of the large-lead screw element in the feeding section. With the main engine speed, all in international standard units, the obtained m³/h is the theoretical limit extrusion volume at this speed.

The actual extrusion volume does not need to be calculated. 一般的に言えば, it is metered feeding. The extrusion volume is the feeding volume you set. If it is hungry feeding (in fact, it is rare because the feeding amount is not stable enough), it needs to combine the characteristics of the material, such as powder or pellets, what is the fluidity of the solid particles, and the structure of the feeding device The size is related, but usually the actual extrusion volume of solid starvation feed will not exceed 80% of the theoretical limit extrusion volume

When designing the metering feed volume, it is usually more appropriate to be 60% of the theoretical limit extrusion volume, and there is no need to adjust the feed volume within a certain host speed range.

Hope it will be helpful to everyone, haha, I wish you success.
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