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3. Description of standard and advanced driving modes
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Standard mode (BFH)
On a standard injection molding machine, the maintenance phase, designed to compensate for shrinkage due to polymer solidification at the start of cooling, consists of applying a constant hydraulic pressure to the injection cylinder (BFH mode: closed loop on hydraulic pressure, figure 1 a). Since the pressure of the polymer in the cavity is not directly taken into account, and since the hydraulic pressure/material pressure transfer function can be significantly affected by a large number of parameters, such as cylinder oil temperature, tool geometry and/or local flow conditions (pressures, temperatures, speeds), this control is sensitive to various process disturbances. These include, for example, thermal disturbances...
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Description of standard and advanced driving modes
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The Ultimate Scientific and Technical Reference