What kind of changes will happen to plastic barrel materials after regular heating?

- Jun 11, 2020-

After the plastic barrel manufacturer's molding material is heated, compacted and mixed in the injection machine barrel, the process of converting the loose powder or granular solid into a continuous homogenized melt is called plasticization. Homogenization includes four aspects: after the material is plasticized, the composition in the melt must be well-balanced and relative density

After the plastic barrel manufacturer's molding material is heated, compacted and mixed in the injection machine barrel, the process of converting the loose powder or granular solid into a continuous homogenized melt is called plasticization. Homogenization includes four aspects: after the material is plasticized, the composition in the melt must be uniform, the relative density, the viscosity and the temperature should be uniform. Metering refers to the preparation work that can ensure that the injection machine performs constant temperature, uniform and quantitative analysis of the plasticized melt according to the plunger or the screw of the extruder. This kind of work requires the injection machine to operate the plunger or screw. Lay in the plasticizing process.

Backflow refers to the reverse fluidity of the melt in the mold cavity toward the glue inlet and the flow channel when the plunger or screw is moved backward in the cylinder. Obviously, all the reverse flow process will be performed from the beginning of the injection pressure removal until the melt at the inlet is frozen. The reason for the backflow is mainly the result of the core pressure exceeding the backflow pressure after the injection pressure is removed, and the melt and air communicating with each other.

It is not difficult to see whether the reverse flow occurs or the extent of the reverse flow is related to the holding time. Generally speaking, the longer the holding time of the plastic barrel manufacturer, the longer the holding pressure acts on the melt in the mold core, the smaller the backflow, and the shrinkage of the plastic parts will be relieved. The short time of holding pressure is just the reverse.

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