Although polyurethane foam and polyurethane glue are both polyurethane products, they have obvious differences in production line configuration, reaction control, equipment requirements, etc.
Product Differences
| Polyurethane Foam | Polyurethane Glue | |
| Main Application | Used in upholstered furniture, sound insulation, automotive interiors and packaging | Used for bonding wood, shoe soles, construction, automotive assembly, etc. |
| Product Form | Foam (cures after foaming) | Viscous liquid or semi-solid |
| Reaction Characteristics | Highly exothermix, volume expansion | Low exotherm, no significant expansion |
| Core Formula | Polyether polyol + isocyanate + blowing agent + catalyst + surfactant | Polyether polyol + isocyanate + tackifying resin + filler + diluent |
Production Line Equipment Differences
| Comparison Item | Polyurethane Foam Production Line | Polyurethane Glue Production Line |
| Main Equipment | Storage tank, metering mixer, foaming machine, mold conveyor | Double planetary mixer, vacuum degassing device, cooling system, filling machine |
| Key Processes | Control foaming ratio, temperature, pressure and flow rate | Control reaction temperature and viscosity, ensure thorough dispersion and mixing |
| Heating Method | Reaction is generally performed at room temperature or with light heating | Electric heating/thermal oil heating |
| Degree of Automation | High, often continuous production (such as spray foam or mold injection) | Mostly batch or semi-continuous production |
| Equipment Materials | Stainless steel or carbon steel with anti-stick coating | Stainless steel (polished interior, anti-crystallization) |
