Description
Thermosealable pearl BOPP film occupies a distinct position in the flexible packaging market, combining the functional sealing performance that high-speed packaging lines require with a distinctive iridescent surface appearance that adds perceived value to any packaged product. The pearl effect is achieved through specialised pigmentation within the film structure, producing a soft, light-refracting finish that varies visually as the angle of view changes – much like a natural pearl surface.
This aesthetic quality makes thermosealable pearl BOPP particularly popular with brands in the premium confectionery, personal care, and gift sectors where packaging appearance is a direct influence on purchase decisions. The film functions exactly as a standard thermosealable BOPP on the production line, with no changes to line speed, jaw temperature, or handling parameters required compared to conventional grades.
Technical Characteristics
The voided BOPP structure that creates the pearl effect also gives the film a degree of inherent opacity, which is useful when some privacy around the packaged product is desired while maintaining a premium appearance. The film is available in thicknesses from 25 to 50 microns. Heavier gauges provide the stiffness needed for stand-up pouches and larger format bags, while lighter gauges suit sachets, small confectionery packs, and overwrapping applications.
Both surfaces can be supplied corona treated to maintain printability and adhesive bonding performance. The film is compatible with flexographic and gravure printing systems and accepts most adhesive lamination processes where a non-sealable reverse side is incorporated into a multi-layer structure.
Frequently Asked Questions
What creates the pearl effect in pearl BOPP film?
The pearl appearance in BOPP film comes from a combination of factors: the inclusion of voiding agents in the polymer formulation creates microscopic air pockets within the film structure, and special pigments scatter and refract light at slightly different wavelengths as the viewing angle changes. The result is the soft, shimmering, light-diffusing effect associated with natural pearl materials, achieved entirely within the film manufacturing process without any surface coating.
Is thermosealable pearl BOPP film food-safe?
Food contact grades are available and comply with EU Regulation (EC) No 10/2011. The pigments and additives used in approved food contact grades are migration-tested. Please specify your food contact requirement when enquiring with NovoPacks so the correct grade is selected for your application.
Can pearl BOPP film be printed?
Yes. Pearl BOPP film accepts flexographic and gravure printing well. The pearlescent background interacts attractively with translucent and metallic inks, creating packaging graphics that look expensive and distinctive. Opaque inks can also be used for solid colour panels. Surface dyne level should be checked before printing if the film has been stored for an extended period, as corona treatment effectiveness can reduce over time.
Does the pearl film add thickness or weight compared to standard BOPP?
Pearl BOPP film at a given micron thickness is slightly lighter than standard BOPP of the same gauge because the voided structure replaces some polymer mass with air. This can be a material cost advantage for high-volume applications. However, the voided structure also changes stiffness characteristics, so it is worth requesting a sample reel to validate the film on your specific packaging equipment before placing a production order.
What packaging formats work best with thermosealable pearl BOPP film?
The film works well in pillow pouches, side-seal bags, and three-side-seal sachets on VFFS and HFFS lines. Stand-up pouches are also a popular format, particularly for premium confectionery assortments and gift selections. The film is less suited to very tight overwrapping formats where stiffness variations between the pearl grade and a standard transparent film could affect machine settings.