Various grades of linear polyethylene have been drawn through a heated conical die at 100° C. It was found that after a suitable start-up procedure, continuous drawing was possible in all cases with a stable neck region extending beyond the die exit. The degree of deformation attainable was found to depend strongly on the draw velocity. Very high deformation ratios could be obtained and the Young's moduli of the die-drawn products were comparable to those of similar products obtained by solid state extrusion and tensile drawing, reaching values as high as 60 GPa. The effects of molecular weight and co-polymerization are substantial, but not exactly analogous to those previously observed in hydrostatic extrusion and tensile drawing. This is probably due to the non-isothermal nature of the final stage of deformation in the case of die drawing.
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Gibson, A.G., Ward, I.M. The manufacture of ultra-high modulus polyethylenes by drawing through a conical die. J Mater Sci 15, 979–986 (1980). https://doi.org/10.1007/BF00552111
- Neck Region
- High Deformation
- State Extrusion
- Deformation Ratio
- Linear Polyethylene