By Mark T. DeMeuse
Biaxial stretching of movie is used for a variety of purposes. Many items starting from meals packaging, to programs for clean minimize produce are produced by way of this procedure. the 1st set of chapters evaluation the basic rules of biaxial stretching. Emphasis is put on the recommendations of the expertise, to boot the different sorts of polymers used. the second one choice of chapters learn the variety of functions for the method, together with product labels, snack packaging to artificial paper. The ebook contains a dialogue of destiny purposes for biaxial stretching of movie.
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Extra info for Biaxial Stretching of Film
The effects of stretching temperature and rate on the stretchability were assessed. The results indicate that the high molecular weight tail and comonomer content play important roles in the orientation of the resins. Higher molecular weight tails, molecular weight distribution, and resin content eluting above 90 °C, as measured by the temperature rising electron fractionation (TREF) technique, tend to increase orientation. In another study of linear LDPE films,24 biaxial oriented samples were produced using the double bubble process with different machine direction orientation levels and the same transverse direction blow-up ratio.
This is made possible through the potential inclusion of a second stretching oven in the design of the Karo IV Stretcher. The second oven can be operated completely independently of the first oven. This means that the effect of having already stretched the material in one direction can be studied in detail. 8 This is a point which is often missed when simultaneous orientation is used to simulate the tenter film production process. This omission means that conclusions which are drawn from the laboratory stretching evaluations do not translate directly into larger scale work, sometimes leading to erroneous results.
4 Recommendations One of the most significant areas in which equipment design in the biaxial stretching areas can move forward is in realizing that not all materials behave in the same way and that equipment will need to be developed for specific applications and materials. This will become increasingly necessary as more niche markets become available for biaxially stretched films. As those specialty niche areas continue to develop, the acceptance of the fact that equipment designed to accommodate more commodity-type applications will need to be modified to penetrate those markets will be essential.