Experimentally Verified Mathematical Model of Polymer Plasticization Process in Injection Molding

Area of Science:

• Polymer Science
• Materials Engineering
• Manufacturing Processes

Background:

• Accurate modeling of polymer plasticization is crucial for optimizing injection molding processes.
• Existing models may not fully capture the complex rheological behavior of polymers during plasticization.
• Understanding flow characteristics is key to improving energy efficiency and product quality.

Purpose of the Study:

• To develop and validate a mathematical model for polymer plasticization in reciprocating screw injection molding machines.
• To analyze and calculate critical flow characteristics including solid bed profile, pressure, temperature, mass flow rate, power demand, screw torque, and energy consumption.
• To compare simulation results with experimental data to refine the model's accuracy.

Main Methods:

• Development of a mathematical model for polymer plasticization.
• Creation of a computer program based on the mathematical model for simulation studies.
• Conducting experimental studies on a research machine to measure key output quantities.
• Comparison of simulation predictions with experimental data for various polymers and operating conditions.

Main Results:

• The initial mathematical model provided a basis for simulation studies.
• Experimental validation revealed discrepancies, necessitating model modifications, particularly in stress determination.
• The refined model accurately predicts plasticization process characteristics with an average error below 10%.

Conclusions:

• The developed mathematical model, after modifications, effectively simulates polymer plasticization in injection molding.
• The study highlights the importance of experimental validation for refining theoretical models.
• The validated model offers a reliable tool for predicting and optimizing injection molding processes.