Review polyurethane raw-material storage practices for moisture, temperature, containers and conditioning, and their links to material stability and processing.
Jiacheng Dai 
Explore static-mixer applications in polyurethane production and review how placement, material flow and mixer sizing influence mixing quality.
Jiacheng Dai 
Understand structural reaction injection molding, compare SRIM with RIM and RRIM, and review preform wet-out, tooling and metering requirements.
Jiacheng Dai 
Explore spray polyurethane foam composition and application, including open- and closed-cell systems and the pressure, heating and ratio controls behind spraying.
Jiacheng Dai 
Review polyurethane foam shrinkage causes through gelling and blowing balance, metering, mold temperature, cell structure and demold timing.
Jiacheng Dai 
Calculate polyurethane shot weight from part volume, molded density and process allowances, and review how actual metering defines the usable shot window.
Jiacheng Dai 
Compare Shore A and Shore D hardness for polyurethane, and relate scale selection, test conditions and material targets to the intended application.
Jiacheng Dai 
Explore semi-rigid polyurethane foam characteristics, differences from flexible and rigid foam, and the density, hardness and processing needs of automotive and rail parts.
Jiacheng Dai 
Explore polyurethane roller manufacturing from metal-core preparation and bonding to metering, casting, curing and finishing.
Jiacheng Dai 
Compare reinforced RIM and conventional RIM for structural parts, with a review of reinforcement, mixing, equipment and production-selection variables.
Jiacheng Dai 
