Plastics Technology - Dedicated to improving Plastics Processing.
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For processes with poor repeatability in short- term tests, the software can provide an immediate improvement. If, on the other hand, the repeatability in short-term tests is very good, the software will not appear to offer any further improvement at first sight. Nevertheless, iQ weight control continually monitors the injection volume and intervenes reliably when something changes. The system is thus an insurance that the process will continue to run reliably in future. The good thing about this type of insurance is that it does not wait for an error signal to be activated. It is already active before the rejects are produced. FIG 5 Presentation of the actual-value curves allows a simple check of how well the injection drive follows the set injection velocity. The graph reads from right to left. Region a is the compression-relief stage, region b the velocity-controlled injection stage, and region c a portion of the pressure-controlled phase. ABOUT THE AUTHORs: Dipl.-Ing. Josef Giessauf is Head of Process Technology Development at Engel Austria GmbH, Schwertberg, Austria. He started in Engel's Technology Development depart- ment in 1995 and has worked in such areas as process analysis, overmolding of textiles and films, variotherm molding, mold- temperature control, injection-compression, and molding of optical parts and glazing. Contact: josef.giessauf@engel.at; engel.at. Christian Maier, M.Sc., is project manager in the Process Technology Development department at Engel Austria. He joined Engel in that department in 2011, and has worked on process engineering and molding of optical parts. Contact: christian.maier@engel.at. 157 135 112 90 67 45 22 0 2000 1714 1429 1143 857 471 285 0 Velocity, cc/sec Pressure, bar c b a Volume, cc 0.0 5.8 11.6 17.4 23.2 29 34.8 40.6 46.4 52.2 58 Injection Pressure Injection Speed @plastechmag 53 Plastics Technology Process Control