Living hinges. Polypropylene. Million-cycle flex.
Living hinge prototyping for cases, lids, packaging. Polypropylene with molded hinge — millions of cycles without failure. Specific design rules.
Living hinge prototyping
Polypropylene homopolymer best. Some special grades for higher temperature service.
Key principles.
PP standard
PP standard living hinge material. Million-cycle fatigue resistance.
0.3-0.5 mm
Critical. Too thin: tears. Too thick: doesn't flex.
1-2 mm
Effective hinge length 1-2 mm for proper flex distribution.
Smooth flow
Mold gating away from hinge. Smooth flow into hinge zone.
Activate
First flex aligns molecules. Always perform after molding.
Mass-production
Standard for mass-production injection-molded enclosures.
FAQ
Millions for properly designed PP hinge. Tested to >10M cycles common.
Polypropylene homopolymer best. Some special grades for higher temperature service.
Hinge thickness 0.3-0.5 mm. Length 1-2 mm. Avoid sharp transitions.
Living hinges first flex orients molecules. Required after molding for full performance.
Cycle test to product specification. Visual inspection for cracks, tearing.
Snap-shut packaging, ammunition cases, medical device cases, fishing tackle boxes.
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