Meaning
Crystalline materials that generate an electric charge in response to applied mechanical stress are widely used in high-pressure monitoring applications. As a sensing element, piezoelectric quartz converts the physical force of a polymer melt into a measurable voltage. This material is highly valued in injection moulding sensors for its extreme rigidity and linear response over a wide pressure range.
It allows for the detection of tiny pressure fluctuations during the packing phase of the cycle.
Electrical Response
The charge produced is proportional to the force applied. Because piezoelectric quartz has high insulation resistance, the signal remains stable even during the long hold times required for thick-walled parts.
Thermal Stability
The crystal structure of quartz remains unchanged at the high temperatures found in hot runner systems. This allows piezoelectric quartz sensors to operate continuously at two hundred degrees celsius without losing sensitivity. Consistent data is maintained throughout a long production run despite the heat from the molten resin.
Sensor Design
Durability is a primary feature of these transducers. The housing protects the piezoelectric quartz from mechanical impact and chemical exposure. Because the crystal is naturally hard, it does not deform under the intense pressures found in the nozzle or the cavity.
