Patent ID: 8518309

Claim:
A measuring method for ascertaining a batch-specific characteristic number of a plasticized plastic, while plastic flows through a flow channel, which is situated between a plasticizing unit and a tool, the flow channel having a taper, during an injection molding operation, the method comprising: carrying out a first measurement during a first injection molding operation, in which first measured data of a first pressure sensor provided along the flow channel and first measured data of a second pressure sensor provided along the flow channel are detected during a first measurement interval having a first lower measuring time and a first upper measuring time; forwarding the first measured data of the first measurement to a first evaluation module and to a second evaluation module; calculating a second measurement interval in the first evaluation module at a second, lower measuring time and at a second, upper measuring time; ascertaining a first batch-specific characteristic number in the second evaluation module; storing the first lower and upper measuring times and the first batch-specific characteristic number; and carrying out a second measurement during a second injection molding operation, in which second measured data of the first pressure sensor and of the second pressure sensor are detected during the second measurement interval.