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Flexible packaging polymer primer

With a beginning understanding of the attributes desired for a film package, the next step is winnowing down the huge selection of possible polymers to those that offer the best combination of cost and performance for your needs.

The word “polymer” derives from the Greek words poly, which means “many,” and mer, which means “parts.” There are naturally occurring polymers; polymer cellulose is the major constituent of plant cell walls and makes up about 50% by weight of most wood and over 85% of cottonseed hair fibers.  Regenerated wood cellulose was one of the first polymer packaging films, and is still in use, with a resurgence of interest due to its natural,
renewable source.

The main action in polymer films, however, is in synthetic polymers, which are produced by connecting simple molecules by a process called polymerization. The nature of simple monomers (Greek for “small parts”) and how many and in what way they are connected lead to the properties that are unique to each different polymer type and its variants. 

A polymer made from a single monomer is called a homopolymer; a copolymer is made from mixtures of two or more different monomers, each called comonomers. Comonomers can connect in different ways: along the main chain or backbone of the polymer molecule in ordered or random ways, or as branches of one polymer off the backbone of the other. A specialized subset of copolymers that is quite useful in packaging is an ionomer.

Conveying Innovations Report
Editors report on distinguishing characteristics that define each new product and collected video demonstrating the equipment or materials as displayed at the show. This topical report, winnowed from nearly 300 PACK EXPO collective booth visits, represents a categorized, organized account of individual items that were selected based on whether they were deemed to be both new, and truly innovative, based on decades of combined editorial experience in experiencing and evaluating PACK EXPO products.
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Conveying Innovations Report
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Annual Outlook Report: Automation & Robotics