Power control system for equipment for injection moulding of plastic materials

Abstract

The identification and location of possible faults of operation and/or installation of a hot runner are obtained through the measurement of the absorption of power by the heating resistors applied to the arms and to the injectors of the hot runner. The qualitative and quantitative analysis of the power absorbed by the resistors also enables identification of the type of possible faults and the corresponding seriousness.

1 - 8 . (canceled) 
   
   
       9 . A method for detecting faults of operation and/or installation of a flow unit for plastic material in a fluid state in equipment for injection-moulding of plastic materials, in which said flow unit includes electrical heating resistors, with associated control thermocouples, supplied by a power unit in a thermoregulated way as a function of the temperature of said resistors detected by said thermocouples, said method including the steps of detecting power absorption of each of said resistors, carrying out qualitative and quantitative analysis thereon, and identifying and locating any said faults through the power absorption detected. 
   
   
       10 . The method according to  claim 9 , wherein identification and location of any said faults are based upon the comparison between the profile of the detected absorption of power over the time and a sample profile. 
   
   
       11 . The method according to  claim 9 , wherein identification and location of any said possible faults are based upon process analyses based upon control charts. 
   
   
       12 . The method according to  claim 10 , wherein on the basis of said comparison the type of a possible fault is also identified. 
   
   
       13 . The method according to  claims 9  applied to moulding equipment including an injection press and implemented in a synchronized way with said injection press.