The automotive industry is one of the most demanding application fields for hot runner systems, and thermocouples must adapt to high temperature, long cycle, high vibration, and harsh material environments. Automotive molded parts such as bumpers, instrument panels, and lamp housings mostly use glass fiber reinforced engineering plastics such as PA66-GF, PBT, and PPS, which require high-temperature stability and precise temperature control.
Type K high-temperature thermocouples are the most widely used in automotive hot runners, with a wide operating range and excellent oxidation resistance. Mineral-insulated thermocouples with thick sheaths are used to resist mechanical damage and thermal fatigue caused by long-term production. Automotive hot runners often run continuously for a long time, so thermocouples must have extremely low drift to maintain stable temperature control.
In valve-gate hot runners commonly used in automotive molding, thermocouples ensure stable melt viscosity when the valve pin moves, avoiding gate defects and inconsistent filling. Vibration resistance is particularly important, as mold movement and injection equipment vibration will affect thermocouple life and signal stability. Poor-quality thermocouples will lead to unstable part size, surface defects, and frequent production interruptions. For automotive suppliers, high-performance thermocouples are the basis for meeting strict quality standards and achieving stable mass production.
