METHOD FOR EVENLY DISTRIBUTING PLASTIC MELT IN A HOT RUNNER SYSTEM USING STRAIN GAUGES.

摘要

A hot runner injection molding apparatus (10), and method of use, is disclosed in which strain gauges (52, 83, 100) are provided in the temperature zones of the hot runner injection molding apparatus and a hot runner controller creates a target strain profile, detects deviations from the target strain profile (93) in any temperature zone based on the strain readings provided by the strain gauges in each temperature zone, and instructs correction of deviations from the target strain profile in any deviating temperature zone by adjusting the heat produced by a heater (81) or heaters (81) in the deviating temperature zone. The target strain profile may be based on a median or average of strain readings provided over time by the strain gauges (52, 83, 100) in each temperature zone. A hollow installation tube for placing the strain gauges in the hot runner injection molding apparatus (10) is also disclosed.