Optimize Part Weight Consistency with the Shibaura Machine Plastrol Function

ELK GROVE VILLAGE, IL, September 2, 2021 - Part weight variations due to inconsistent check ring response can cause unwanted fluctuations and endanger a stable injection molding process. When we look for ways to stabilize the process and improve shot-to-shot repeatability, Shibaura Machine’s Plastrol function can do a lot.

Stabilizing the shot size and optimizing check ring response of the screw tip can be accomplished with the Plastrol function. This function allows for the part weight and filling pressure to be stable which is especially important when running small shot sizes.

How does the Plastrol function operate? 

With four special operation types, the user can control the screw’s special operation after charging completes. These operations can be performed individually or combined.

Four Operation Types:

• Pre injection after charge: Injecting resin at low pressure after charging allows the auxiliary compression of that resin and regulates its density. The effect is stabilization of plasticization resin quantity.
• Pre-injection after decompression: Advances the screw after decompression completes and closes the check ring, stabilizing it.
• Screw inversion in decompression: Reversing the screw during decompression lowers the resin pressure between the check ring and spacer, stabilizing the check ring response. 
• Screw inversion before injection: Reversing the screw operation before starting injection lowers the resin pressure between the check ring and spacer, stabilizing the check ring response. 

What are the benefits of this function? 

The real benefit of the Plastrol function is better shot weight repeatability and more consistent parts. Using this function thoughtfully can stabilize and optimize the overall injection molding process. Contact our injection molding team to learn more about the Plastrol function and our SXIII series.