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In order to improve product quality，geometric accuracyand to save materials，extrusion output must be wntrolledstably in polymer extrusion processing.The accuracy of on-lineoutput-measuring is the precondition of product geometricaccuracy and stable extrusion.Digital filtering technology was applied in system of weight-loss metering feeding to improve the aeemaey of on-line output-measuring in extrusion process.Recursive average and Limiting-recursive average filtering algorithms were programmed in its numerical processing of weight-loss metering control system and well applied to on-line measuring output inextruding bar.