Improve Injection Molding Part Weight Stability with Plastrol

  • Injection Molding

ELK GROVE VILLAGE, IL, March 2, 2022 - Many manufacturers are facing increased supply chain hiccups, especially when it comes to resin. Pair that with increases in demand for everything from medical devices to semiconductor components and this leaves little room for error in injection molding.

With so many variables in play during the injection molding process it can be complex and oftentimes tasks fall through the cracks, no matter how obvious. One of the most common is part weight variations which can occur due to inconsistent check ring response. When stabilized this can greatly improve shot-to-shot repeatability. Luckily, with the right machinery and technology in use, preventative measures can be taken and the process optimized. 

Shibaura Machine’s V70 controller includes the Plastrol function which offers the user control of the screw’s operation after charging completes. Utilizing one of four operation types, or combining them together, the user can stabilize the shot size and optimize the check ring response of the screw tip. Being able to ensure part weight and filling pressure is stable can be a game changer for repeatability, especially when molding critical parts. 

Understanding Plastrol Operation Types

Using one or a combination of the Plastrol operations mentioned below, the user can ensure better shot weight repeatability and consistency in part production. 


By injecting resin at a lower pressure after charging it will allow the auxiliary compression of the resin and better regulate its density. Decompression begins from the position where the PRE-INJECTION AFTER CHARGE is completed and the injection speed shift and final packing control positions are automatically corrected. This process improves stabilization of the shot size.



This operation allows for advancing of the screw after decompression and will close the check ring to stabilize it. 


This function reverses the screw operation before starting injection. It will lower the resin pressure between the check ring and spacer, also speeding up check ring response and stabilizing it.



This operation will reverse the screw after decompression is complete and close the check ring for stabilization.


Shibaura Machine’s Plastrol function on the V70 Controller brings a user-friendly way to ensure unwanted fluctuations that can upset a stable injection molding process.

Contact the Injection Molding team to learn about the SXIII series machines and how the Plastrol function can help improve shot-to-shot repeatability.

Tel: (888) 593-1616 


Contact us today to learn how Plastrol can help improve your molding process!

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