A Study of the Effect of Draw Down Ratio on the Properties of Extruded Tubing
In this study the effect of draw down ratio on the properties of extruded tubing is presented. The draw down ratio was evaluated for six different materials. Tubes were extruded using a single screw extruder with a standard metering type screw and the resultant extrudate was tested for mechanical properties, burst pressure and percent crystallinity. When the draw down ratio is increased, tensile load values were found to increase and tensile elongational values were found to decrease. Burst pressure increased with an increase in draw down ratio. Percent crystallinity studies on high density polyethylene show an increase in the percent crystallinity with an increase in the draw down ratio. The draw down ratio in variable air gaps was also evaluated as a part of study. With there is an increase in the air gap at a constant draw down ratio, the tensile load values increased but tensile elongational values and burst pressure decreased. Percent crystallinity in high density polyethylene tubes increased with an increase in the air gap.
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