The Process Of Closing The Mold On Plastic Injection Molding Machines

In 1 working cycle injection process, begins by the process of closing the mold. The term Mold in the world of Plastic Injection is a mold for the plastic injection process. The mold itself consists of 2 major parts namely the “Core” side and the “Cavity” side. The Cavity side is fastened to the “Stationery Platen” Injection Machine. While the Core side is tied to the “Moving Platen” machine, this is the part that moves open and close. Ball screw also has an important role in this process and ball screw repair must often be done so that there are no problems with the machine. In closing the process is divided into 4 sequence processes visit this link, namely:

A. The movement closes at slow speed with low pressure. (Low Mold Close Velocity & Low Mold Close Pressure). The pressure in question is hydraulic pressure. The initial position of the mold is “fully open” which is arranged in such a way as to allow the resulting product to be removed or taken easily. From this position, it moves to a certain position not too far from the “fully open” position earlier. This movement aims to reduce engine vibration while maintaining the engine itself. Hydraulic oil leaks caused by a hydraulic hose rupture are the lightest examples of damage. Mechanical damage requires greater costs, so the cost of engine maintenance will be high.

B. The movement closes at high speed with low pressure
Starting this movement in a position not far from the “fully open” position, where for faster movements is possible. This aims to save the overall processing time.

C. The movement closes at slow speed with low pressure
Before the mold closes tightly, the mold must move slowly with low pressure to avoid a collision. This also aims to maintain the condition of the mold and also the condition of the machine so that it is always in a good performance and can produce smoothly.

D. Pressing the Mold with High Pressure
The position in this process must be as limited as possible in the tightly closed position after the previous move. This also avoids collisions due to relatively high hydraulic pressure to crush the mold. This high pressure (minimum 100 kg / cm²) is needed to hold the injection process or what is called “Cavity Force During Injection” later.

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