Solid State Coextrusion: A New Technique for Ultradrawing Thermoplastics Illustrated with High Density Polyethylene.
Abstract
Ultra-oriented high density polyethylene (HDPE) extrudates have been prepared in continuous lengths by a new method employing conical dies of nominal draw ratios up to 36X. Preformed HDPE billets approximately equal to 7 cm (duPont Alathon 7050) were split longitudinally into two halves and then one or more wafers of the same polymer were inserted between the two sheath halves. Thereafter, the whole assembly was extruded in the absence of lubricant and at temperatures substantially below the melting range and afforded continuous and transparent films. The physical and mechanical properties of the HDPE films so produced were evaluated and compared with the respective properties of the same polymer extruded conventionally through a slit die. The high melt transitions, tensile modulus and transparencies confirm the effectiveness of the new method in obtaining continuous ultradrawn films.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 15, 1978
- Accession Number
- ADA049190
Entities
People
- Anagnostis E. Zachariades
- Phillip D. Griswold
- Roger S. Porter
Organizations
- University of Massachusetts Amherst