Conclusion

In this way, the effectiveness of advanced injection molding machine control modes (closed-loop on polymer pressure, without and above all with an adaptive model) has been validated for a wide range of configurations (different polymers, tooling and presses) in stabilizing the mass of molded parts. Furthermore, a detailed analysis of PBT shows that this improvement is not achieved at the expense of overall dimensional stability (estimated in terms of volume shrinkage at molding and total shrinkage (after annealing)) or mechanical property stability (estimated in terms of impact strength after molding and after annealing).

Furthermore, if we confirm that these intelligent control modes lead to slightly higher internal stresses than those generated by conventional press control, given the increased efficiency of the holding phase, the induced resilience losses are...