Method for statistic weighing of a product introduced into containers in a filling machine

A method for statistical weighing of a product introduced into containers in a filling line of a filling machine, said filling line moving in a forward direction and receiving said containers in seats;

• said product being supplied by delivery means consisting of a plurality of nozzles, matching with apertures of a group of containers moving through a working area of said filling line;
• the method including the following operation steps:
• F) withdrawing an empty container, belonging to a first withdrawing group, from the filling line, to define an empty seat in said first withdrawing group;
• G) transferring the empty withdrawn container onto a scale located adjacent to the working area of the filling line, weighing said withdrawn empty container, by means of said scale, to determine a tare weight of said empty container;
• H) withdrawing the empty weighed container from the scale and introducing the weighed empty container back into said filling line, in an empty seat, made in a first test group of containers, the empty seat matching with a selected nozzle to be tested, in said working area;
• I) moving the first test group of containers into the working area and introducing product into the weighed empty container, by means of said selected nozzle, up to a pre-established filling level;
• J) withdrawing the filled container from said filling line, downstream of said working area, thus redefining the empty seat in the first test group of containers;
• K) transferring the filled container onto the scale and weighing, by said scale, the withdrawn filled container, to determine a gross weight thereof, so as to determine the quantity of product introduced into the filled container, by determining the difference between the corresponding values of tare and gross weight, which were obtained from the same scale.