Patent ID: 6022210
Filing Date: 2000-02-08
Classification: B29C,H05B

Abstract:
In a hot runner nozzle assembly (10) including: a housing (12); an externally heatable feed tube (16) in said housing, the feed tube having a shaft (17) within said housing and a tip (26) at a bottom end (49) of said shaft; the improvement comprising:heating means (20) for said feed tube, said heating means including a heater, said heater including a heater coil (23) surrounding said shaft and extending towards said tip,a heat sensor (34) having an extending portion (41) seated in a positioning groove and extending beyond said heater coil towards said tip,a compound body (24) stabilizing said heating means, said compound body cast around an inner tube (42) surrounding said shaft (17), anda shaft foot (48) of a material having extremely low heat conductivity, said shaft foot surrounding said heating coil with a gap along a lower portion of said shaft for reducing heat dissipation from said tip to said housing.