Unit_8_-_Plastic_Packaging (2)

Unit_8_-_Plastic_Packaging (2) - dioxide. LDPE has branched...

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8.6.3 Low Density Polyethylene (LDPE) - #4 LDPE is the most widely used plastic in packaging. It is flexible, transparent, and low in cost. LDPE has a highly branched structure. LDPE has very low water vapor permeability, so it is a good moisture barrier; however, it is a poor barrier to organic vapors, essential oils, oxygen, and carbon dioxide. Thus, LDPE should not be used to package products which are subject to oxidation or are pressurized by carbon
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Unformatted text preview: dioxide. LDPE has branched molecules. Some of the ethylenes are not attached along the “backbone”, or the main chain; rather they are arranged in groups that branch off of that backbone. This does not let them pack together as well, and the result is lower density. LLDPE's structure and density falls between HDPE and LDPE. A branched polymer looks something like this: 8. 5...
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This note was uploaded on 03/04/2012 for the course PKG 101 taught by Professor Haroldhughes during the Spring '08 term at Michigan State University.

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