Hydrostatic Extrusion of Glass Reinforced and Unreinforced Celcon® POM
Several of the solid state shaping methods developed for metals have been found applicable to polymers. When applied to plastics such methods as rolling, drawing and hydrostatic extrusion can impart substantial molecular orientation, consequently enhancing physical properties. Of these techniques, hydrostatic extrusion may have advantages in that glass filled resins may be employed and more complex profiles may be produced, including hollow sections. Here, we investigate the processing speeds and physical properties attainable by hydrostatic extrusion of glass reinforced and unreinforced Celcon® polyoxymethylene. Large size scale and modest 2–10 area reductions are explored so that commercially feasible production rates can be approached. Both resins can be successfully processed by hydrostatic extrusion. Furthermore, at these modest reductions, significant gains in physical properties are achieved. The strongest beneficial effects are found in tensile and impact strengths. Surprisingly, the elongation of the glass filled resin is also improved.
KeywordsReduction Ratio Draw Ratio Tensile Modulus Flexural Modulus Extrusion Temperature
Unable to display preview. Download preview PDF.
- 2.J. M. Alexander and P. J. H. Wormell, Annals of the C.I.R.P., 19:21, 1971.Google Scholar
- 7.“Ultra-high Modulus Polymers”, ed. by A. Ciferri and I. M. Ward. Applied Science Pub., London, 1977, Chapts. 1 & 2.Google Scholar
- 12.A. Buckley and C. Cassin, U.S. Patent 3, 642, 976, 1972.Google Scholar