Boiling phenomenon appears in PU rigid foam pouring

The foam body suddenly collapses in a boiling manner after pouring. This problem is relatively common in foam molding production and requires comprehensive analysis and solution from multiple aspects of material, process, and equipment.

(1) Temperature parameter aspect: The amount of water as a chemical blowing agent is too large and the reaction temperature is too high, which may cause thermal degradation of the material or runaway reaction rate, destroying the internal structure of the product. (2) Mixing process aspect: Poor pre-mixing of the physical blowing agent causes bumping, Uneven mixing causes inconsistent reaction or performance among regions. (3) Material aspect: Fluctuations in raw material performance indicators or insufficient pretreatment affect molding quality. (4) Process aspect: Control deviation of key process parameters causes the '2079851475616104453 to deviate from optimal conditions. (5) Equipment aspect: Equipment precision and maintenance status affect the stable execution of process parameters.

(1) Process control: Strictly control the water content in the formulation, Establish an online monitoring mechanism, set upper and lower parameter limits, and implement alarm management. (2) Process operation: Uniformly pre-mix the physical blowing agent, Optimize stirring parameters to ensure uniform dispersion of all components, avoiding local concentration differences. (3) Parameter adjustment: Reduce the initial temperature of the raw material., Note that after lowering the temperature, it is still necessary to ensure the material fully reacts or melts; adjust step by step and observe the effect. (4) Preventive measure: Establish sound process control standards and a quality inspection system, and regularly review process data for continuous optimization.

This problem requires comprehensive analysis from multiple dimensions of material, process, equipment, and operation, and should be solved by systematically optimizing process parameters and the quality control system.