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Microcellular foam injection molding technology

Supercritical fluid microcellular foam injection molding technology

Background of microcellular foam injection molding technology 菠萝街直播app下载
The use of foaming technology in plastic processing can effectively reduce the weight of products, but the traditional foaming process
Using petroleum gas (such as butane, pentane) as foaming agent, with the increasingly prominent problems of environmental protection and production safety, the demand for energy-saving, environmental protection, safety and stability of new foaming agent is expanding.
In the conventional state, the dissolved amount of carbon dioxide or nitrogen in the molten resin is very small, which is not enough for foaming. However, in supercritical state, the solubility and diffusion speed of carbon dioxide or nitrogen will be greatly increased, so that the process conditions required for microcellular foaming are fully met. With the cooperation of perfect process technology and equipment, the supercritical gas realizes micropore Foaming effect.


Principle of microcellular foaming material forming technology

In the process of injection molding, extrusion and blow molding, the supercritical carbon dioxide or nitrogen is injected into the special plasticizing device of the injection molding machine, so that the gas and the molten raw material are fully and evenly mixed / diffused, and then the single-phase mixed melt adhesive is formed;
        After the mixed glue is injected into the mold cavity by a special screw, a great pressure drop occurs outside the mixed melt during the injection process, resulting in a pressure difference between the inside and outside of the mixed melt, resulting in the formation of a large number of bubble cores;
In the process of forming the foam, the bubbles grow in the inner part of the foam.

Advantages of microcellular foam injection molding technology

? effectively save raw materials, reduce product quality and production cost;
? eliminate surface shrinkage marks, eliminate later deformation and distortion, and improve dimensional accuracy
? the fluidity of the mixed melt adhesive is increased by 20% - 40%, the viscosity is low, and the filling effect is obvious;
? effectively reduce molding temperature, shorten molding cycle and improve production efficiency;
? microporous structure can effectively improve internal stress distribution, reduce mold locking pressure and save energy;
? the supercritical gas preparation process is simple, low cost and environmentally friendly;
? zero emission of pollutants in the manufacturing process and no chemical residues in the products;

Microcellular foam injection molding technology and equipment
                                                                  
By: supercritical nitrogen acquisition device Supercritical gas injection equipment Special plasticizing device for mixed sol and screw composition, specific model and parameters, please contact our company.

Application products of microcellular foam injection molding technology

  • Automobile interior and exterior decoration parts, engine compartment parts and other products are the most widely used space field of microcellular foam injection molding technology, which has far-reaching development significance;
  • Industrial appliances, home appliances, office and commercial electronic products parts are also The application of microcellular foam injection molding technology has great potential for development;
  • TPV/TPE Sealing strip, PVC profiles, PP / PE / PSF foam products parts are more The application of microcellular foam injection molding technology is developing in space;