High-barrier multilayer shrinkable film for circular economyIn Europe and Oceania, there is a demand for food packaging that is compatible with the circular economy, and in response, packaging is being developed that uses a single raw ma-terial, PP or PE. As a result, EVOH is used as a material to provide gas bar-rier properties, but the percentage of its use is limited. There is also a de-bate about the use of PVDC; the differ-Kureha Nanako Saigusa of Kureha’s Polymer Processing Research Laboratories de-scribed the development of a shrink-able film with high gas barrier proper-ties as an alternative to non-chlorinated materials. With this film, the percent-age of gas barrier material can be re-duced to less than 5 wt%.ence in gas barrier properties between EVOH and PVDC depends on humidity, with the gas barrier properties of EVOH decreasing under high humidity condi-tions; PVDC is more flexible than EVOH and is widely used in shrink packaging.In this development, polyglycolic acid (PGA: Kuredux), which has very high gas barrier properties, was used as the gas barrier material; a single lay-er of PGA film was prepared and then stretched from 3.0×3.0 times to 4.0×4.0 times in a batch-type biaxial stretching machine. The oxygen permeability of this PGA film is very low and can meet the required gas barrier properties of shrinkable film for meat.In addition, a prototype PE/PGA/PE-PGA multilayer film was prepared and its gas barrier property, mechan-ical properties and hot water shrinkage were measured. The results showed almost the same performance as the company’s PE and PVDC film. The company plans to conduct hygiene and recycling tests in preparation for use in the U.S. and European markets.Publication: January 2015Format: B5 size377pages (contents)Price: US$150 + shippingAuthor: Hiromu HashimotoConverting Technical InstituteOrder: www.ctiweb.co.jp/con/enPublishing office: Book Guide9Theory and Application of Web Handling
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