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Enhancing Dimensional Stability and Environmental Durability in Delrin-Molded Parts Through Advanced Annealing Techniques

Author: Dhrudipsinh Dabhi (Senior Technical Program Manager)

Abstract

This paper presents the implementation and optimization of an advanced annealing process designed to enhance the dimensional stability, moisture resistance, and crystallinity of Delrin-molded parts for demanding outdoor applications. Delrin, a widely used acetal resin, poses unique challenges in plastic injection molding due to its natural tendency to shrink post-molding and absorb moisture, which can compromise part performance in variable environmental conditions. By introducing a high-capacity annealing oven with precise temperature and humidity control, we achieved substantial improvements in part stability and durability. This process was developed through close collaboration with customer engineering teams and our in-house experts, ensuring the final product meets strict tolerance and environmental durability requirements. Results indicate that the annealing process effectively reduces dimensional variation, decreases moisture content by 75%, and increases crystallinity by 20%, making the parts robust enough to withstand extremes of heat, cold, and humidity. This study underscores the value of high-tech annealing solutions in the plastic injection molding industry, offering a blueprint for similar applications in advanced manufacturing.

Keywords: Delrin Annealing, Crystallinity Enhancement, Dimensional Stability, Moisture Resistance, Environmental Durability, Plastic Injection Molding, Advanced Manufacturing Techniques, High-Capacity Annealing Oven, Quality Engineering, Process Optimization

DOI: 10.55041/ISJEM0027