Matching with three mainstream hot runner structural categories: hot tip open gate, single-point sprue and valve gate system, hot runner thermocouple products are divided into four core product series: nozzle dedicated thermocouple, manifold embedded thermocouple, universal spring bayonet thermocouple and non-standard customized special-shaped thermocouple, each product owns fixed dimension, wiring and installation specification corresponding to matched hot runner components. Nozzle dedicated thermocouple holds maximum market output and splits into thin needle probe and clip-on buckle two subtypes. Needle probe thermocouple features 1.0/1.5/2.0mm ultra-thin armored sheath, inserted into pre-drilled blind hole of nozzle tail to directly test metal temperature adjacent to melt runner; customizable effective length ranges from 30mm to 300mm to fit YUDO, Husky, MHT different brand nozzle overall size. Clip-on buckle thermocouple fixes on outer heating ring surface via metal spring clip without mold drilling, convenient for later transformation and after-sales replacement of old hot runner molds, dominating aftermarket maintenance market of consumer plastic product molds.
Manifold embedded thermocouple specially designs for split plate multi-independent-zone temperature control, mostly equipped with thick-wall seamless stainless steel sheath and grounded inner core, horizontally embedded into pre-reserved manifold mounting holes with sensing core closely attaching outer wall of inner melt channel, avoiding erosion damage from overflow molten plastic under long high-temperature production. Large automotive instrument panel multi-cavity manifold hot runner usually matches 6~32 pieces embedded thermocouples corresponding to independent heating zones one by one; each sensor feeds back real-time temperature data to multi-channel controller to balance molten plastic flow of all cavities and reduce finished product warpage defect.
Universal spring bayonet thermocouple achieves interchange compatibility for over 90% global imported hot runner brands with unified bayonet metal head dimension; users can directly replace original Husky/Mold-Masters/YUDO spare thermocouple without modifying mold installation hole, optional outer wire coating includes fiberglass, Teflon and Kapton three materials: fiberglass wire endures high ambient temperature nearby mold plate, Teflon resists acid volatile plastic gas corrosion, thin Kapton wire fits narrow wiring space of compact small-size precision molds. Non-standard customized special-shaped thermocouple covers U-bend, L-bent probe for ultra-dense multi-nozzle compact medical micro hot runner, 5mm ultra-short miniature probe for PET bottle preform high-speed thin-wall molding system and ceramic encapsulated high-temperature thermocouple for over 450℃ PPS/PEI valve gate hot runner. When selecting thermocouple, mold factories need to confirm hot runner brand, nozzle/manifold specification and molding plastic temperature three core parameters first; mismatched model directly causes temperature out of tolerance and finished product sink mark, flow streak and scorch defects.
