Review on the Effects of Process Parameters on Strength, Shrinkage, and Warpage of Injection Molding Plastic Component

ABSTRACT

Injection molding process causes differences between designed shape and real parts, all of them associated to shrinkage and warpage phenomena. Temperature, pressure distribution, and other injection parameters during molding process originate local shrinkage and the internal stresses depending on the relative stiffness of each part area. The aim of this work is to review and report the influence of injection molding process parameters on the postmolded strength, shrinkage, and warpage of injection molded parts. It is also to investigate the influence of injection molding process parameters on the postmolding shrinkage and warping of parts made of polypropylenes.

GRAPHICAL ABSTRACT

KEYWORDS:

• Injection molding
• polypropylene
• process parameters
• shrinkage
• strength
• warpage

Abbreviations:

• GA: genetic algorithm
• RSM: response surface methodology
• RBF: radial basis function
• ANN: artificial neural network
• DOE: design of experiment
• MIMO: multi-input multi-output
• MISO: multi-input single-output
• S/N: signal-to-ratio
• OA: orthogonal arrays
• PP: polypropylene
• CAD: computer-aided design
• SQP: sequential quadratic programming
• T_m: mold temperature
• T_i: melt temperature
• t_i: injection time
• P_p: packing pressure
• t_p: packing time