Injection-Molded Polymer Foaming With Pressure-Temperature Feedback
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Solution Overview
Problem
Injection molding processes for foamed polymer materials suffer from inconsistencies in cell size, expansion ratio, and mechanical properties due to fluctuations in pressure and temperature, leading to unpredictable and variable sole structure size.
Innovation Solution
A system and method for controlling nozzle pressure and temperature in the injection molding process by using a pressure feedback loop and temperature feedback system to maintain consistent physical parameters, ensuring uniformity in the injection of molten polymeric material into the mold cavity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If automated injection molding process is used for cost-effective production, then productivity is improved, but manufacturing precision deteriorates due to pressure and temperature fluctuations
Solution Approach 1:
The patent implements feedback control systems that continuously monitor injection pressure and molten material temperature, automatically adjusting process parameters to maintain consistency. Pressure sensors and temperature sensors provide real-time data to controllers that modify injection rates and heating parameters, ensuring uniform cell size and expansion ratio while maintaining automated high-volume production
Solution Approach 2:
The patent systematically controls and adjusts critical process parameters including injection pressure, injection rate, and molten material temperature to optimize foaming characteristics. By maintaining parameters within specific ranges and using feedback to correct deviations, the system achieves consistent cell structure and mechanical properties across large production volumes
2Manufacturing precision
If injection rate is increased to maintain nozzle pressure, then manufacturing precision is improved, but device complexity increases due to feedback control systems
Solution Approach 1:
Pressure sensors positioned at critical locations provide real-time feedback to controllers that automatically adjust injection parameters. This closed-loop control maintains consistent nozzle pressure and cavity pressure without requiring complex manual intervention, using automated algorithms to balance precision requirements with system manageability
Solution Approach 2:
The patent replaces manual control mechanisms with automated electronic control systems. Controllers use sensor data to automatically adjust injection rates and pressure parameters, eliminating the need for complex mechanical adjustment mechanisms and reducing overall system complexity while improving precision
3Manufacturing precision
If temperature control is implemented to maintain melt temperature, then manufacturing precision is improved, but use of energy increases
Solution Approach 1:
Temperature sensors continuously monitor molten material temperature and provide feedback to heating control systems. The system automatically adjusts heating element power to maintain temperature within optimal ranges, reducing energy waste from overheating while preventing temperature variations that would affect foaming consistency and product quality
Solution Approach 2:
The patent applies heating selectively and proportionally based on actual temperature requirements rather than continuous maximum heating. The feedback control system activates heating only when and where needed to maintain temperature specifications, minimizing energy consumption while ensuring consistent molten material properties for reliable foaming
Data Source
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AI summary
A foaming process and a method for operation of the foaming process are provided. The method includes flowing a molten polymeric material into a mold from an upstream device, receiving the molten polymeric material in a cavity of the mold, and maintaining a repeatable, uniform pressure profile as the molten polymeric material is delivered into the mold.