Rubber Injection Molding Troubleshooting

Injection too slow during the injection portion of the molding cycle the material does not fill the mold in the recommended injection time.

Rubber injection molding troubleshooting.

Evaluating the root causes of rubber molding defects through virtual molding. Tool modification can also be difficult with the machine s runner system. If these issues are not controlled promptly and properly they could end up resulting in damage to the machine mold and finished product. Liquid silicone rubber injection molding troubleshooting.

Air traps is that air is trapped in the cavity to create bubbles in the part. Material is also limited to high flowing compounds when it comes to rubber injection molding. Rubber injection molding may have higher initial startup costs when compared to other molding processes. Flow lines are streaks patterns or lines commonly off toned in color that show up on the prototype part as a consequence of the physical path and cooling profile of the molten plastic as it flows into the injection mold tooling cavity.

Stock temperature too low mould temperature non uniform or too low mould fill too fast or too slow excess mould lubricant scratched or dirty mould surface fill speed and or packing time too low inadequate venting improper gate location or design. Virtual molding will auto matically calculate heat flow through all the mold components and the heat lost from the cavities due to radiation while the mold is open. Check injection throttle position and if possible increase its setting. Common issues with rubber injection molding.

When injection molding liquid silicone rubber certain problems can occur that directly affect the quality of the final product in spite of the great planning that may have gone into material selection machine process and the processing parameters. Increase stock temperature by increasing back pressure and or barrel temperature. If the press is not in inject transfer mode the hydralock pressure set point must be satisfied before injection will start check the 1st stage inject pressure and speed if the 2nd stage inject volume is not zero then check the 2nd stage inject pressure and speed.