Preperse PET grade are pigment preparations recommended for PET applications including polyester fiber masterbatch, PET film master-batch. Preperse PET pigments are also in granular type. They are dust-free, free-flowing and suitable for auto-feeding.
The low content of polymer carrier material used has a positive effect both on the rheological properties of the polymer melt and also on the technical properties of the final products, such as better tensile strength and elongation rate of fibers and yarns.
In order to achieve the FPV requirement for severe applications, twin-screw extruder and making mono masterbatch is necessary. The common FPV of Preperse PET grade is ≤ 0.8 bar/g, based on below condition： Mesh number: 1400; Pigment content involved: 60g; Pigment % to resin: 8%. Above data refer to mono masterbatch made by twin-screw extruder.
