Key Mold Design Challenges

Living hinge molding precision: The wall thickness in the hinge area must be tightly controlled (typically 0.2–0.4 mm) to ensure durability through repeated opening and closing without fracture.
Balanced 36-cavity layout: The runner system, cooling channels, and ejection mechanism must be highly balanced to prevent warpage or dimensional variation across caps.
Complex demolding structure: Since the flip lid and base are molded as a single piece, sliders or forced ejection mechanisms are often required to avoid damage to snap features or sealing lips during demolding.
High surface quality and functional fit: The visible surfaces must be free of burrs, sink marks, or flow lines, and critical mating features—such as snaps and sealing rings—must maintain tight tolerances (within ±0.05 mm).

Typical Application Industries

Personal care (travel-sized shampoos, mouthwashes, conditioners)
Pharmaceutical & healthcare (eye drop bottles, oral liquid containers, disinfectant wipe cases)
Household & cleaning products (kitchen cleaners, small bleach packages)
Food condiments (ketchup, salad dressing, mini cooking oil bottles)
Cosmetic samples (serum sachets, sheet mask essence dispensers)

Flip-top Cap Injection Mold Design Proposal (1×36 Cavity)