Manufacturers of precision engineering components today have three major targets: highest productivity,lowest cost and quality with zero-defect levels.Customers in electrical,medical and automotive sectors demand precision injection-moulded parts which are a perfect fit every time,with no rejects.Achieving these quality standards is best done through quality control systems integrated in the moulding operation-making the whole production process leaner and more cost effective.The Swiss-based Kistler Group,provider of measurement technology,sensors and systems for the injection moulding industry,has created an extensive white paper into the complexities of quality measurement and control.Kistler identifies a single parameter-cavity pressure-as critical to fault-free moulding production.The white paper explores the science around the intricacies of the injection moulding process,provides clear explanations of the impact on cavity pressure of factors such as injection speed,holding pressure,holding pressure time,mould and melt temperatures,and,most importantly,the switch-over point.The gradient of cavity pressure in a moulding reflects exactly the conditions during the injection process when the plastic part is produced.The optimum quality control solution is thus based on continuous monitoring of cavity pressure.Any irregularities detected here will indicate that the required quality specifications won't be met and the moulded part must be automatically separated.Measurement of cavity pressure not only provides quality security in production,but also enables efficient process optimisation to minimise waste,potentially eliminating rejects completely.
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