Patent ID: 7303701
Filing Date: 2007-12-04
Classification: B29C

Abstract:
1. A method for estimating a temperature of plasticized resin within a heating cylinder, which comprises: selecting two or more of a heating cylinder temperature, cycle time, metered resin amount, hack pressure arid number of rotations of a screw to be set as plasticizing conditions, and setting a provisional plasticized-resin temperature estimating mathematical expression indicating that the selected plasticizing conditions arc to be multiplied by respective unknown coefficients and summed up; conducting a given number of experiments equal to or greater than the number of the unknown coefficients in the provisional plasticized-resin temperature estimating mathematical expression, to thereby acquire data indicative of the selected plasticizing conditions; converting the unknown coefficients into known coefficients in accordance with the data acquired from the experiments; converting the provisional plasticized-resin temperature estimating mathematical expression into a complete plasticized-resin temperature estimating mathematical expression using the known coefficients; and estimating a current temperature of the plasticized resin within the heating cylinder by substituting data for the selected plasticizing conditions into the complete plasticized-resin temperature estimating mathematical expression.