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Journal of Plastic Film and Sheeting
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New MDO Medium Molecular Weight High Density Polyethylene Films

Eric Hatfield

Flex Tech Packaging Ltd, 10095 International Boulevard, Cincinnati, Ohio 45246, USA

Richard Tate

EVAL Company of America, 11500 Bay Area Blvd., Pasadena, Texas 77507, USA

Kelly Williams

Equistar Chemicals LP, 11530 Northlake Drive, Cincinnati, Ohio 45249, USA

William Todd

Equistar Chemicals LP, P.O. Box 513, Victoria, Texas 77902, USA

Machine Direction Orientation (MDO) can enhance many film properties such as tensile strength, elongation, stiffness, optics (haze and gloss) and water vapor transmission rate (WVTR). Although MDO can be used with high molecular weight-high density polyethylene (HMW-HDPE) resins, few or no medium molecular weight-high density polyethylene (MMW-HDPE) films have previously been available due to MDO processing issues, namely stretch resonance, which is a phenomena where the film stretches unevenly. Thus it has not been possible to take advantage of the better barrier properties and improved process capabilities of the MMW resin. This paper describes a new line of machine direction orientable MMW-HDPE films that are now commercially available; these were made possible through the use of a proprietary processing aid (PA) that overcomes the stretching problem previously encountered with MMW-HDPE resins. Physical property data for two MDO MMW-HDPE films are presented.

Key Words: MMW-HDPE • HMW-HDPE • uniaxial stretching • stretch resonance • machine direction orientation (MDO) • Ziegler-Natta • physical properties • WVTR • optical properties • processing additive • Elmendorf tear strength • draw ratio

Journal of Plastic Film and Sheeting, Vol. 18, No. 2, 117-127 (2002)
DOI: 10.1177/8756087902018002006
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