Appeal 2007-1207
Application 10/703,917
BACKGROUND
The invention
The invention is directed to estimating the temperature of the plastic
resin in the heating tube rather than the temperature of the tube itself. To
accomplish this goal, Nissei creates an equation that is the sum of selected
process variables with unknown coefficients. Nissei next determines the
coefficients experimentally. The equation using the now-known coefficients
used to estimate the resin temperature.1 Nissei explains2 that:
whereas the conventionally-known technique estimates such a
plasticized resin temperature on the basis of a detected
temperature of the heating cylinder and can therefore only
achieve poor measurement accuracy, the inventive method can
estimate, with a much higher accuracy, plasticized resin
temperature closely approximate to an actual measurement.
Claim 1 defines the invention as follows:3
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, back pressure and 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 are 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;
1 Specification at 2:6-3:2.
2 Specification at 3:12-17.
3 The claim language comes from the claims appendix of the appeal brief.
2
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