Shrinkage is nightmare of every injection molding engineer, but what causes them?

Shrinkage is nightmare of every injection molding engineer, but what causes them? 1: The Material Itself: Materials like PP/PE/PA have high shrinkage rates and poor flow ability, making them prone to shrinkage.2:Poor Product Design: Uneven wall thickness, unreasonable design of reinforcing ribs, pillars, and other localized protrusions. 3:Injection parameters:Insufficient holding pressure, improper temperature control, and inability to continuously supply material to the cavity; 4:Mold design: Incorrect gate location, uneven distribution of the cooling system.;What other product defects are causing you headaches? Share it!