Photo Source: Kistler GroupThe new 2205B thermocouple amplifier from Kistler allows greater efficiency and flexibility when using temperature sensors installed in the injection mould.
Quantum leap in contact-free cavity pressure measurement – plus improved thermocouple amplifier
Thanks to a new PiezoStar crystal, the 9239B miniature longitudinal measuring pin from Kistler achieves almost five times the sensitivity of its predecessor – which already ranked as the technology leader. Also new: the 2205B thermocouple amplifier – now with multiple improvements – to integrate temperature sensors more efficiently into the measuring chain for high-grade injection molding.
Contact-free cavity pressure measurement with piezoelectric sensors is the most sophisticated of the three measurement methods used in injection moulding (the other two are direct and indirect measurement). The contact-free method is mainly used where high quality and process requirements have to be met: examples include absolutely flawless products for automobile interiors, high optical quality (for items such as lenses), or situations where very compact injection moulds are used.
The 9239B miniature longitudinal measuring pin from Kistler gives customers a cavity pressure sensor that takes up virtually no space when installed (diameter: 2.5 mm), and performs its task without contacting the melt. It is mounted directly behind the cavity wall in the mould structure or the embossing die, where it measures the pressure-induced compression of the mould during the injection and holding pressure phases. "Thanks to its compact dimensions for optimal installation, the 9239B gives mouldmakers more freedom when positioning it in smaller moulds or multi-cavity moulds with more complex structures," according to Marko Marceta, Product Manager Plastics at Kistler.
Utmost accuracy – but no contact with the part
The 9239B miniature longitudinal measuring pin represents a major advance on its predecessor model: it features a PiezoStar crystal grown by Kistler itself, which increases the sensitivity many times over – to no less than 27 pC/N. The new measuring pin from Kistler is a world first that elevates contact-free cavity pressure measurement to an unprecedented level of accuracy. The mounting method eliminates the possibility of marks on the part, and the sensor is not exposed to abrasion or corrosion. Another benefit: because the measuring pin is installed in the preloaded state, it can capture both compression and tensile forces with very high accuracy.
Using temperature sensors more flexibly
Kistler has also made significant improvements to its 2205B multichannel temperature amplifier. It is used to convert signals from temperature sensors installed in the injection mould (known as thermocouples) into standardized voltage signals. Compared to the 2205A predecessor model, the improvements include channels for up to eight thermocouples. In addition, it is now possible to simultaneously connect different types (K,J,N). Type J thermocouples can now also be used at 400°C and the uniform measurement range (0 to 400°C) reduces the number of variants.
Measuring the mould temperature opens up further scope for process monitoring and control of injection moulding with thermoplastics, and for many other applications. The 2205B has a standard operating temperature range of 125°C which can be extended to 195°C with an additional housing. The temperature sensors are connected using the cut-and-grip method to avoid the need for connectors and tools.
Final words from Dr. Robert Vaculik, Head of BU Plastics at Kistler: "With these two innovations, we are offering our customers yet more opportunities to continue enhancing the quality of their products and manufacturing processes. They are ideal for Class A surfaces or in the medical sector, for instance: the key to setting new standards for industrial injection moulding."