Polyurethane Bra Cup Viscoelastic Speed-Dependent Support

The patent applies parameter changes by utilizing the rate-dependent mechanical properties of polyurethane material. The material exhibits different elasticity characteristics at different stretching speeds: at slow stretching speeds (daily wear conditions), the material remains elastic and comfortable; at fast stretching speeds (exercise conditions), the material becomes tight and protective. This resolves the contradiction by allowing the same material to provide both comfort for daily wear and support for exercise without adding complex structures like underwire or resin materials.

The patent applies dynamics by using a polyurethane intermediate layer whose mechanical properties dynamically change based on the stretching speed. During daily wear with slow movements, the material maintains elasticity for comfort. During exercise with rapid breast movements, the material automatically becomes tighter to provide protection. This dynamic response resolves the contradiction between comfort and protection without requiring separate bras for different occasions.

The patent applies composite materials by creating a three-layer structure consisting of an outer layer, an inner layer, and a polyurethane intermediate layer. The key innovation is that the polyurethane layer serves multiple functions simultaneously: it provides comfort during daily wear, support during exercise, and acts as an integral bonding layer between the outer and inner layers. This composite structure achieves dual-scenario performance without the need for additional complex components like underwire, resin materials, or multiple separate layers, thus resolving the contradiction between adaptability and complexity.