Explore polyurethane elastomer chemistry, material types, hardness and mechanical properties, with production considerations for selecting a processing route.
Jiacheng Dai 
Explore dual-density polyurethane sole production, from the two-layer design and pouring sequence to the metering and reaction controls needed for consistent molding.
Jiacheng Dai 
Compare dynamic and high-pressure impingement mixing for polyurethane, including shot size, viscosity, cleaning, maintenance and process-selection trade-offs.
Jiacheng Dai 
Review DEG use in polyurethane formulation, its role in hard-segment balance, and the dosing, NCO-balance and equipment checks associated with its addition.
Jiacheng Dai Understand how polyurethane demold time affects mold occupancy and production output, with a review of early-release risks, delayed release and cycle-planning variables.
Jiacheng Dai 
Explore polyurethane dimensional stability under temperature, moisture and load, and review the material and machine controls that influence finished dimensions.
Jiacheng Dai 
Distinguish polyurethane density from hardness, compare foam and solid-elastomer behavior, and review how to specify both properties without treating them as equivalent.
Jiacheng Dai 
Explore day-tank functions in polyurethane foaming, with sizing and maintenance checks for material level, temperature, recirculation and production demand.
Jiacheng Dai 
Understand cast polyurethane processing from prepolymer preparation and curative conditioning to metering, casting and curing, and compare CPU with other material forms.
Jiacheng Dai 
Review polyurethane cure control through material and mold temperature, stoichiometry, catalysts and reaction monitoring, distinguishing demold readiness from full cure.
Jiacheng Dai 
