By Mark T. DeMeuse
Biaxial stretching of movie is used for quite a number purposes. Many items starting from meals packaging, to applications for clean minimize produce are produced by means of this strategy. the 1st set of chapters evaluate the basic rules of biaxial stretching. Emphasis is put on the options of the know-how, to boot the differing kinds of polymers used. the second one selection of chapters research the variety of purposes for the method, together with product labels, snack packaging to artificial paper. The publication features a dialogue of destiny functions for biaxial stretching of movie.
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With the present capabilities of both the AccuPull stretcher from Inventure Laboratories and the Karo IV stretcher from Brückner to generate stress–strain curves during the stretching operation itself, it is possible to obtain information about the dynamics of the actual stretching process. This information will be extremely useful in comparing different polymers as well as comparing the same polymer from different polymer suppliers. The information that is obtained from the laboratory stretching evaluations will be useful in estimating the behavior of new polymers and formulations on commercial stretching equipment.
This will allow for better predictive tools to be utilized and implemented. 5 References 1. A. Peterlin, J. Appl. , 6, 490 (1971). 2. A. P. Nekrasov, J. Mat. , 18, 1691 (1999). 3. NIIR Board Handbook on Modern Packaging Industries, Asia Pacific Business Press, Inc. (2008). indd 25 7/1/11 8:53:32 AM 26 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. Biaxial stretching of film A. K. Ahluwalia, Polymer Science: A Textbook, CRC Press (2008). W. Billmeyer, Textbook of Polymer Science, Interscience Publishers (1962).
For example, in US 6168826, issued to Mobil,25 a process is disclosed for preparing biaxial oriented polyethylene films with improved optics and sealability properties. Specifically, the described process involves stretching a multilayer base sheet with in the MD, extrusion coating the base sheet with either LDPE or linear LDPE and, then, stretching the base sheet in the TD. The properties of the final film are such that an alternative to blown HDPE films is said to be provided at significantly thinner film thicknesses.