7. Air bubbles7.1 the formation: gas injection molding process are available in the product. The air bubbles formed the hole inside the product.7.2 the cause: during the process of filling the mould, the air is retained in the product in the region near the surface of the product.7.3 How to khăc:Reduce the loss of pressure or the pressure reduction screw by reducing speed (especially when air bubbles are formed right near the gates of the spray).It is necessary to optimize the shape of the mold.Check the design and condition of the exhaust valve.8. formation of bubbles and holes8.1 the formation: The shrinkage of the material flow-forming air bubbles visible (transparent materials) or not visible in the product.8.2 the cause: a hard crust on the outside have shrinkage, while the error class inside still melts in the cooling process. Plastic part melts in error does not shrinkage according to the entire product should block empty hole inside the product.8.3 How to khăc:Optimize time and pressure.Increase mold temperature.Increase the size of the book spray, spray and spray the Berlin gates.Temperature increase flow.Create a buffer zone.Tăng tốc độ phun.
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