Hot runner valve gates have a structure such that the runner section can be heated, allowing resin to be injected directly into the product section of the mould in a molten state, and the gate section can be opened and closed individually by inserting and moving a pin in the gate section. Compared with hot runner moulds, this type of moulding process offers a higher degree of freedom in terms of controlling the resin filling in the mould, as the resin inflow from the gates can be controlled individually for each gate. However, because of the greater degree of freedom, there are more parameters in terms of control methods during moulding, and the control related to gate opening and closing of the valve-gate system must be managed during moulding.
From the analysis side, together with the determination of the gate position, the timing of opening and closing of the valve gate is required during the calculation, which further complicates the combination of boundary conditions to perform the analysis.
Depending on the gate position and gate opening/closing timing, ideal filling may not be possible. In such cases where filling is ideal as described above, gas venting should be processed when designing the mould.
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