Integrated sealed thermocouples have gradually replaced traditional split assembled products and become the mainstream configuration of high-end hot runner systems. Through one-piece integral forming, laser seamless welding and full internal insulation filling, it has obvious advantages in structural firmness, temperature measurement accuracy, anti-corrosion performance and bending resistance, solving many inherent defects of split thermocouples.
First, integrated molding has no intermediate welding seam. Split thermocouples have obvious welding joints between probe and lead, which are easy to loose, break and oxidize under long-term mold vibration and bending fatigue. The integrated structure is integrally drawn and formed from the alloy core to the outer sheath, with overall mechanical strength greatly improved, resistant to frequent mold opening and closing bending and impact vibration, no hidden fracture and poor contact.
Second, fully sealed structure realizes comprehensive anti-corrosion and isolation. The whole body is laser welded and sealed without tiny gaps, which can completely isolate acidic corrosive gas, oil mist and humid air generated by plastic melting, prevent internal alloy wire from being oxidized and corroded, and adapt to PVC, halogen flame-retardant and recycled plastic harsh working environments. The smooth outer sheath is not easy to accumulate dust and carbon deposition, maintaining stable heat conduction efficiency for a long time.
Third, higher temperature measurement accuracy and response speed. The internal insulation filling is dense and free of gaps, the heat conduction path is stable, there is no thermal resistance loss at the welding seam, the temperature response is more sensitive, and the feedback data is closer to the real runner temperature. It is suitable for multi-zone precise temperature control and high-cavity mold cavity balance regulation.
Fourth, convenient installation and low later maintenance cost. Integrated sealed thermocouples support various bending angle customization, plug-and-play on site, no need for secondary assembly and welding, reducing human installation errors. Long service life and low failure rate reduce frequent replacement and mold disassembly downtime, and comprehensively save the comprehensive use cost for injection molding enterprises.
