Speaking of injection molding machine
screw, most propbably is not strange for some customers friend, injection molding machine screw in plasticizing quality play an important role, it has transport, melting and mixing, compression, measurement and exhaust, and other functions, is a key factor affecting the quality of plasticizing.
So how to choose and to mark the screw also is particularly important, the following, several important parameters is provided for your reference.
1, screw diameter (
Associated with the required injection quantity, injection volume = 1/4 * & amp;
* D2 * S (
2, screw diameter (
With the high injection pressure is inversely proportional to, is proportional to the plasticizing capacity;
3, responsible for plastic conveyor, push and preheating, should guarantee the preheated to the melting point;
4, crystalline plastics should be long (
Such as POM, PA)
Amorphous material times (
Such as PS, PU, ABS)
Sex is the shortest,
Such as PVC)
5, injection molding machine screw responsible for plastic mixing, compression and exhaust pressure, through this period of almost all raw materials of melting, but not necessarily evenly mixed;
6, plastic melt gradually, screw grough must be reduced, with corresponding plastic geometric volume to drop, otherwise false material pressure, heat transfer is slow, the venting is not good;
Generally accounted for more than 25% of the screw, compression 7 working length, but the nylon screw accounted for about 15% of this paragraph, high viscosity, high fire resistance, low conductivity, additives, such as plastic screw accounted for about 40%, PVC screw can be accounted for 100% of the proportion, lest produce intense shear heat.
8, measuring long mixing effect is good, is too long, easy to melt thermal decomposition stay too long, too short, easy to make uneven temperature, generally about 20% proportion, ensure that all plastic melt and uniform temperature, mixing evenly;
9, PVC and other heat-sensitive plastic should not stay a long time, in order to avoid thermal decomposition, the available short measurement period;
10, feed screw groove depth the deeper, the larger the throughput, but should be considered, injection molding machine screw strength measuring screw groove depth is shallow, the plasticizing fever, mixing performance index is higher, but the measuring screw groove depth is too shallow shear heat increase, authigenic heat increases, the temperature is too high, cause plastic discoloration or burnt, especially bad for heat-sensitive plastic.
Can say is the heart of the injection molding machine screw, the screw quality determines the quality of product quality.
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