THE EFFECTS OF CONDUCTOR TEMPERATURE ON THE QUALITY OF EXTRUDED VINYL WIRE INSULATION,
BAKELITE CO BOUND BROOK N J
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The effects of conductor preheating and other variables on the quality of extruded vinyl wire coatings was discussed in great detail. It was seen that heat shock failures could be overcome by extruding the compound at an optimum temperature or hotter. However, very little if any, improvement in other properties is achieved by increased compound temperature without conductor preheating. For this reason, the satisfactory passing of a heat shock test does not imply optimum quality although conversely, the failure of a heat shock test does imply extremely poor or the poorest quality of extruded vinyl insulation. An attempt was also made to show that slight conductor preheating i.e. enough to take the chill from the wire is not sufficient to ensure good quality. The best results in these experiments were obtained with conductor temperatures of 300 and 350 deg. F. Little improvement was made at temperatures above 300 deg. F. Hence it is recommended that conductors for vinyl insulations be heated to at least 300 deg. F. to ensure good quality as determined by optimum physical properties such as maximum tensile strength and elongation and minimum shrinkage. It was also shown that adhesion of insulation to conductor for a given compound can be controlled by controlling the conductor temperature.
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