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Image shows iQ weight control software on ENGEL injection molding machine controller

Compensation for fluctuations of plastic viscosity

Thanks to regulation of the injection volume with iQ weight control

The software optimizes the injection volume during the injection molding process. This regulates fluctuations in the plastic viscosity. iQ weight control compares the injection pressure curve of each cycle with a defined reference curve and reacts to external influences. As a result, the accuracy of the injection molding process is increased, and the weight of the parts remains constant.

Up to 50%

Less rejects


Higher process stability


Suitable for recycling

Advantages of optimized plastic viscosity in production
85% less weight deviations thanks to controlled injection volume
Picture shows plastic container

The intelligent assistance program, iQ weight control, adjusts each injection process during production. It detects and monitors the injection volume and calculates the switchover point of the injection molding process in the same shot, based on the plastic viscosity. Fluctuations are compensated for in each shot. This reduces deviations of the molded part weight by up to 85%. Your benefit is better process stability, increased part quality and process repeatability.

Wide range of applications for recyclates
Image shows recyclates

Fluctuations in the viscosity of plastics are a major challenge when processing recyclates. iQ weight control detects these fluctuations in the raw material and adjusts the injection profile and switchover point to current production conditions in the same shot. Recyclates from different sources can be processed - with a significantly minimized reject rate and increased productivity.

Visualizations on controller enable a fast correction of process parameters
Picture shows machine operator at the controller

The simple visualization when monitoring process-critical parameters immediately shows where adjustments are necessary in the injection molding process. By automatic calculations of the parameters, the software compares the pressure curves of the injection volume and the reference curve determined by iQ weight control. The system can detect differences and corrects deviations of the plastic viscosity quickly and efficiently.

Do you have questions about the iQ weight control software?

Our digital experts are available to answer your questions about controlling the injection volume and responding to changes in plastic viscosity.

Image shows the iQ weight control software display on the injection molding machine controller
6 steps to constant part weight with iQ weight control

Just a push of a button for users - the machine controller takes care of the rest

  1. Activate iQ weight control

  2. Current pressure curve is compared with reference curve

  3. Changes in plastic viscosity and material quantities are calculated

  4. Switchover point and holding pressure are adjusted

  5. Deviations due to external influences are compensated for

  6. Part weight remains constant


  • Reduced reject rate up to 50%

  • Increased parts quality

  • 66% higher process stability

  • Better process repeatability

  • Increased productivity

  • User report from Lercher Werkzeugbau

    Complaints arose due to parts not being full during batch changes or the use of recycled material. iQ weight control brought stability to the process.

  • How you can intelligently compensate for process deviations

    Watch the short video to see how the iQ weight control software works to optimize plastic viscosity.

  • Tutorial iQ weight control

    iQ weight control is part of our digital product portfolio that automatically compensates for plastic viscosity fluctuations and keeps part weight constant.

  • Innovative software solutions

    Intelligent assistance systems on a victory 460/120 tech injection molding machine

Picture shows Sales Director Digital Solutions at ENGEL Austria

iQ weight control improves part quality and productivity for a wide range of applications thanks to regulation of the injection volume. In addition to the economic aspect, a key feature of our assistance systems is their ease of operation.

Hannes Zach, Sales Director Digital Solutions at ENGEL Austria
Picture shows employees of Braun and ENGEL
Customer report: iQ weight control
Braun improves weight consistency by 85%

Braun, the manufacturer of electric shavers, has reduced weight fluctuations from 0.02 g to 0.003 g with iQ weight control - an 85% improvement in weight consistency.

Picture shows plastic closures
Technical article: Stable injection molding processes with iQ weight control

To ensure consistent part quality, intelligent assistance systems such as iQ weight control are very useful in high-performance processes. Production of closures also benefits from this software.

Additional products and services to increase part quality

Image shows networked injection molding machine by ENGEL

Digital solutions

  • Optimization of injection molding processes along the product life cycle

  • Networking across the system

  • Utilize the full potential of your production

Picture shows machine operator at the CC300 injection molding machine controller

Injection molding machine controller


  • Safe and intuitive

  • Innovative machine operation

  • Self-explanatory navigation

  • Individual configuration

Picture shows service technician from ENGEL

Global service and support

Support for digital solutions

  • Expert advice

  • Analysis of your machines

  • Implementation of digital solutions

  • Injection molding training

Image shows green recyclate

Circular Economy

  • Team of experts

  • Solutions for plastics recycling

  • Support in Circular Economy

Markus Lettau

Molding Industry Business Advisor

+1 (717) 767 2016

Write us

The ENGEL team is happy to support you with extensive knowledge in the field of injection molding.

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