Determination of injection molding process windows for optical lenses using response surface methodology

Area of Science:

• Materials Science and Engineering
• Optical Engineering
• Manufacturing Processes

Background:

• Achieving optimal optical properties in plastic lenses is crucial for imaging applications.
• Injection molding parameters significantly influence lens performance, including astigmatism, coma, and spherical aberration.
• Establishing precise process windows is essential for consistent, high-quality lens production.

Purpose of the Study:

• To determine the injection molding process window for plastic lenses with optimized imaging optical properties.
• To identify significant factors affecting lens optical performance using experimental design.
• To validate the determined process windows through confirmation experiments.

Main Methods:

• Utilized the Taguchi experimental method to identify key parameters influencing optical properties.
• Employed full factorial experiments and response surface methodology to model relationships.
• Applied curve fitting to define process windows based on melt temperature and cooling time.

Main Results:

• Mold temperature, melt temperature, and cooling time were identified as significant factors affecting optical properties.
• Response surface models were developed to predict optical performance based on process parameters.
• Confirmation experiments showed low average errors (3.44% to 5.69%) for astigmatism, coma, and spherical aberration.

Conclusions:

• The established injection molding process windows are highly reliable for producing plastic lenses with optimal optical properties.
• The methodology provides a robust approach for optimizing manufacturing processes for optical components.
• Accurate control of melt temperature and cooling time is critical for minimizing optical aberrations.