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Article: Optical properties of highly transparent polypropylene cast films: influence of material structure, additives, and processing conditions.
- Article from:
- Polymer Engineering and Science
- Article date:
- April 1, 2006
- Author:
CopyrightCOPYRIGHT 2006 Society of Plastics Engineers, Inc. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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INTRODUCTION
Polymer films used in the packaging industry often have to fulfill high requirements as to their optical properties. Particularly in medical applications, special optical properties such as low haze and high clarity are key issues. Polypropylene (PP) cast films are in use for packaging of drugs and medical substances. Because of technical and economic reasons, such films should be produced in a high-speed extrusion process.
The disturbances affecting the optical properties of melt-processed films may be due to the structure of the bulk of the polymer as well as to the structure of the film surface, whereas the latter is predominant. Earlier ...