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Flash is a common problem encountered in the production process of injection molding machines. When the pressure of the plastic in the mold cavity of the injection molding machine is too large, the splitting force generated is greater than the clamping force, so the mold is forced to squeeze out and form a peak on the surface of the plastic part. However, there may be many reasons for this phenomenon, such as plastic problems, damage to the injection molding machine, or timing adjustments.
Generally speaking, plastic temperature has the greatest effect on viscosity, while pressure and shear rate also have an effect on viscosity. If the injection molding machine raises the temperature of the plastic, its viscosity will decrease, and if its temperature is lowered, its viscosity will increase. Another problem with plastic is its dry condition and whether it is mixed with impurities. Some plastics, such as nylon and ABS, have properties that affect plastics. As for polycarbonate, although it has no water absorption, its properties are also sensitive to moisture on its surface. Therefore, many plastics must be dried before molding. In order to properly control its performance. If impurities are mixed in the plastic, or different types of plastic are mixed, it is of course more difficult to predict the change in the properties of the plastic.
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