Capillary rheometer with temperature controller for maintaining uniform temperature distribution of sample

摘要

In a capillary rheometer including: a furnace comprising a plurality of furnace zones and having a sample bore with a capillary connected to the lower end thereof; a plurality of heaters for heating the furnace zones thereby to heat a sample in the sample bore; and a plunger for extruding the heated sample through the capillary; a plurality of temperature sensors are provided for detecting the temperatures of the furnace zones, and the temperature characteristics of the furnace zones related to the temperature of the inner wall of the sample bore are obtained and stored in a controller. With a set objective temperature level to which the sample in the sample bore is to be heated, the controller determines on the basis of the stored temperature characteristics data the temperature of each of the furnace zones corresponding to the set objective temperature level, and controls the heaters so that the temperature detected by each of the temperature sensors coincides with the determined temperature of the corresponding one of the furnace zones. A temperature measuring rod is also provided, which is adapted for insertion into the sample bore to accurately measure the temperature of the inner wall of the sample bore.