Bi-Orientated Film is essentially stretched in two directions (machine and traverse direction) to manufacture shrink wrap and barrier type films with typical shrinkage in the 20 to 60% range dependent on formulation, label wraps, tapes, capacitance films and many other applications. Typical films are Bi-Orientated Polypropylene (BOPP), Bi-Orientated Polyethylene Terephthalate (BOPET/polyester) and Bi-Orientated Polyamide (BOPA). Stretching allows for the alignment of the polymer molecules to improve physical properties.
BOPP film is used in snack, pasta and other packaging applications including the overwrap for multi-packs. BOPP is typically 15 to 30 microns and can be as thick as 50 microns. Water based acrylic and PVDC coatings are often applied to increase moisture and odor barrier levels, and sealing properties.
Improved formulations and application technology allows for these acrylic and PVDC coatings to be measured with Near Infrared (NIR) technology on the wet end to optimize coat weight across the web profile. Cost, regulation, standardization and maintenance are moving the measurement preference from nuclear to NIR.
Process Sensors Corp. MCT Nova Series of Near IR transmitters and Guardian Web Profile Systems make immediate and accurate coat weight measurement. Please contact us today to discuss your application.