I. Introduction

Injection - molding materials are of vital importance in the industry. The deformation problem severely affects product quality. Which injection - molding material has the least deformation? This article delves deeply into this issue, analyzes the influencing factors, and introduces high - quality materials to provide professional guidance for readers and help improve product quality.

II. Factors Affecting the Deformation of Injection - molding Materials

Temperature Factor: Different coefficients of thermal expansion lead to various dimensional changes of injection - molding materials when the temperature changes. The glass - transition temperature also affects the material properties. When the ambient temperature approaches or exceeds this temperature, the physical properties of the material change and it is prone to deformation.

Stress Factor: If the flow stress and cooling stress during the injection - molding process are not effectively released, the residual stress inside the material will be caused, and the injection - molded parts will deform after demolding.

Moisture Absorption Factor: Some injection - molding materials such as nylon are sensitive to moisture. After moisture absorption, the molecular chain spacing increases, the size expands and the physical and mechanical properties change, which affects the dimensional stability.

III. Introduction of Injection - molding Materials with Less Deformation

IV. Material Selection and Process Optimization

1.Material Selection Principles

According to product performance requirements, for high-temperature environments, choose materials with high heat deflection temperature and small coefficient of thermal expansion (such as LCP and PEEK); for high-precision needs, LCP can be selected. In humid environments, choose materials with low moisture absorption rate (such as PPO and PSU); when in contact with chemical substances, choose materials with strong corrosion resistance (such as PEEK and PSU). At the same time, balance cost and performance.

2.Process Optimization

Mold Design: Reasonably layout cooling water channels and design appropriate gate positions and quantities to reduce stress concentration and ensure uniform filling.

Injection Parameters Adjustment: Optimize parameters such as temperature, pressure, and speed to improve filling performance and dimensional stability, and control holding time and pressure to compensate for shrinkage.

Post-treatment Process: For high-precision products, annealing can be used to eliminate residual stress, and materials with high moisture absorption rate can be dried.

3.Quality Control

Dimensional Measurement: Regularly measure key dimensions with high-precision tools.

Mechanical Property Testing: Reflect material properties and product quality, and indirectly reflect dimensional stability.

Process Monitoring: Monitor key parameters in real time and strictly inspect raw materials.

V. Conclusion

This article discusses the factors affecting the deformation of injection-molding materials, introduces injection-molding materials with less deformation and their characteristics and data, and expounds on material selection principles, process optimization and quality control methods, providing a reference for choosing suitable injection-molding materials and optimizing processes, and helping to improve product quality and dimensional stability.