The fiber reinforcement effect in rubber depends on the aspect ratio of the fiber, defined as the ratio of its diameter to length. Reducing fiber diameter effectively increases the aspect ratio, but achieving good dispersion with fine fibers in high-viscosity rubber can be challenging. Consequently, thick, high-tenacity fibers are typically preferred in such applications. We have successfully developed very fine polyester fibers that disperse easily in rubber.

In an island-sea cross-section, these fine fibers constitute the “island” within a “sea” of polyethylene polymer. By mixing the sea-island cross-section fiber with rubber at temperatures above the melting point of polyethylene (PE), the PE sea component melts and becomes compatible with the rubber. This allows for effective dispersion of numerous fine fibers within the rubber matrix, resulting in improved rubber properties, including enhanced modulus, vibration resistance, and flex resistance.

Cuttable length :0.5mm~

“Observation of Dispersion State and Tensile Fracture Surface Using Electron Microscopy

Cross-section of the rubber compounding sheet

PE (sea components) is compatible with rubber, and PET nanofibers disperse well within the rubber

Streamlined manufacturing process helps reducing the amount of chemicals and water consumption. The energy required to product PE/PET Nano reinforcement fiber could be roughly estimated to be half that of conventional fibers. (in house comparison)