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By Mark T. DeMeuse

Biaxial stretching of movie is used for more than a few functions. Many items starting from nutrients packaging, to programs for clean minimize produce are produced through this technique. the 1st set of chapters assessment the elemental ideas of biaxial stretching. Emphasis is put on the concepts of the expertise, to boot the differing kinds of polymers used. the second one selection of chapters study the variety of purposes for the method, together with product labels, snack packaging to artificial paper. The e-book contains a dialogue of destiny functions for biaxial stretching of movie.

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Extra resources for Biaxial Stretching of Film

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As the crystallization rate increases, the film becomes increasingly unsuitable for double bubble processing. This limits the type of polymers that can be used. Additional specific details of this work are provided in Chapter 10. indd 23 7/1/11 8:53:32 AM 24 Biaxial stretching of film In a similar study, Song and White14 studied the double bubble tubular film extrusion and stretching of a polymer known as polyethylene-2,6-naphthalate (PEN). They examined the film formation and structure development of PEN during the extrusion process.

This peak is called the yield stress of the polymer and gives an indication of the ease in which the polymer can be oriented. The yield stress value itself systematically decreases with increasing temperature until finally when the melting point of the polypropylene is reached, it is essentially zero. 1 Stress–strain curve for homopolymer polypropylene stretched at 140 oC. The numbers correspond to the various regions of behavior in the curve. indd 33 7/1/11 8:54:34 AM 34 Biaxial stretching of film also increases.

Karnavas, ‘Polypropylene Biaxial Oriented Film’, US Patent 6733719, issued May 11, 2004. com/ [accessed January 3, 2011]. brueckner. com/[accessed January 3, 2011]. L. K. Su, Polymer, 42, 9059(2001). J. Bur and S. Roth, Polym. Eng. , 44, 805 (2004). S. L. White, Polym. Eng. , 39, 1160 (1999). K. L. White, Polym. Eng. , 40, 1122 (2000). K. Sakauchi, T. Takebe, H. Vehura, T. Yamada, Y. Obata, and T. Kanai, J. Polym. , 27, 447 (2007). indd 26 7/1/11 8:53:32 AM 3 Laboratory evaluations of biaxially stretched film M .

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