Published on the Packaging World Web site

Materials Product Brief
| February 28, 2005

Preforms

Preforms are pre-molded heat shrinkable neck bands made of PVC or PETG film. They are used to secure the lid to the container and provide tamper-evident protection.
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Preforms are useful with containers that do not have shoulders because they grip and make an even seal. Preforms are available clear or printed. Custom prints and logos are available.

SOURCE: http://www.packworld.com/package-component/films/preforms