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Name：Rebecca Dong
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Change and selection of flow parameters of injection mold. |
The injection molding process can be divided into three sections. In the first section, the plastic is transported, compressed, melted and plasticized between the rotating screw and the material cylinder, and the plastic melt is stored in the front end of the material tube (between the screw head and the nozzle). As for the rheological theory of this aspect, because it is not related to the injection mold design, it is a little bit here. In the second section, stored in a cylinder end of the plastic melt, due to the push forward of the screw, then through the nozzle, the mainstream of the injection mould, distributary channel and gate, start into the mold cavity. The research of injection molding process is concentrated in this section, so it is the focus of our discussion. In the third section, the plastic melt flow, phase change and solidification in the process of injection mold. This section has so far been mostly in the semi-empirical phase.
In the second section, the rheological behavior of plastic melt is very similar to that of plastic melt in capillary rheometer. Although there are some differences, theoretical analysis and experiments show that the results are measured by capillary rheometer. It has a good relationship with the injection molding process. Therefore, the plastic melt flows through the pouring system and can be approximated by the function relation between shear stress and shear rate. In the use of the data obtained through experiments, the apparent shear rate and apparent viscosity are plotted on a logarithmic scale. It is very convenient to solve the problem and avoid the trouble caused by solving the exponential equation.
Is the basic requirement of the injection molding processing molding, plenty of plastic melt at breakneck speed, the people in a certain volume of cavity, coupled with suitable process conditions, to efficiently produce a uniform appearance and inner quality good injection molding processing products. For this purpose, the rheological parameters that should be considered in the design of injection molding system are analyzed, and the appropriate choice is made.
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