Vacuum hopper loaders are supposed to make material feeding automatic and dust-free, but many injection molding factories still struggle with clogging, motor burnout, material leakage, inconsistent feeding, and difficult maintenance. This article breaks down the five most common vacuum hopper loader problems reported by factory engineers and explains how LESINTOR, a Chinese factory-direct manufacturer with 20 years of experience, designs its vacuum autoloaders and central feeding systems to prevent these issues. Written for plant managers, procurement teams, and machinery distributors evaluating vacuum hopper loader suppliers.