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What are the factors that affect the density of solid plastic balls

Update:21-01-2021
Summary:

The density of solid plastic balls cannot be exactly th […]

The density of solid plastic balls cannot be exactly the same due to material reasons and differences in injection molding processing technology. For customers who are not demanding, such differences will not have much impact, but some demanding customers , The density of the plastic solid balls must be consistent, so find the reason for the difference in the density of the solid plastic balls.

During the injection molding process, the solid plastic ball tends to keep the gas inside the plastic ball and form bubbles. These bubbles are the main reason for the density of the plastic hollow ball. The cause of the bubbles in the plastic solid ball is mainly due to the material and the mold. The reason for the parameter setting of the injection molding machine.

The main reason for the material is that the material is not sufficiently dried, causing the gas in the material to enter the mold cavity along with the rubber material, forming bubbles. The improvement method is to fully dry the material, which will completely solve the air bubbles inside the plastic ball caused by the moisture content of the material.

The original picture of the mold, because the gas in the plastic ball mold runner is not discharged from the mold in time, this part of the gas is trapped inside the plastic ball, forming bubbles. The solution is to vent the mold accordingly, so that the gas in the mold is discharged out of the mold, and no bubbles are formed.

In the injection molding process of the injection molding machine, the shooting speed of the machine is too fast, so that the gas in the mold cannot be discharged from the mold in time, causing trapped air and forming bubbles. The solution is to slow down the shooting speed of the injection molding machine, which can be significant Solve the problem of plastic ball air bubbles.