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During the polyolefin film extrusion process, a coefficient of friction (COF) occurs between those layers or between the film’s surface and the extrusion equipment. COF and increase in friction create processing difficulties, delays, increased extrusion rate, and operational costs for the polymer manufacturer. Tospearl™ plastic film additives decrease the contact between film layers during the extrusion process by lowering the coefficient of friction (COF) and thus preventing them from sticking together. Plastics in film packaging need stable and lower COF surfaces, and Tospearl™ allows for such requirements due to its spherical narrow particle size distribution.
The slip properties are illustrated below, which show Tospearl™ 120 FL, 130 FL, 1100 FL, and 145 FL’s low surface energies, uniform sizes, and spherical shapes, which impart lubricity to plastic films.
With Tospearl™, there is no need to worry about heat sealing issues like traditional migratory plastic additives. Below are features that make Tospearl™ a great choice in BOPP films.
Tospearl™ is available in a variety of particle sizes and suitable for most film thicknesses. The diameter of the resin bead should approximately be 40% of the skin layer thickness to provide the lowest possible COF to ensure adequate bead retention.
Properties | Tospearl™ 120 FL | Tospearl™130 FL | Tospearl™145 FL | Tospearl™1100 FL |
---|---|---|---|---|
Appearance | White spherical beads | White spherical beads | White spherical beads | White spherical beads |
Mean Particle Diameter1(µm) | 1.8 - 2.3 | 2.3 - 3.1 | 4.0 - 5.0 | 8.5 - 10.5 |
Weight Loss @250°C & 0,5 hr, % | <1.0 | <1.0 | <1.0 | <1.0 |
pH2 | 6.0 - 8.0 | 6.0 - 8.0 | 6.0 - 8.0 | 6.0 - 8.0 |
Bulk Specific Gravity | 0.35 | 0.36 | 0.43 | 0.66 |
Particle Specific Gravity | 1.32 | 1.32 | 1.32 | 1.32 |
Refractive Index | 1.42 | 1.42 | 1.42 | 1.42 |
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