Among the synthetic fibers, the polypropylene is lightest and easy to handle, has a temperature resistance of 90 ° C, and is excellent in acid and alkali resistance. Therefore, it is applied to the gas-solid-liquid-solid separation field where the smoke temperature is below 100 °C or the acidity and alkalinity are strong. The material of high quality TR eyeglass frames is much more expensive than other frame materials. And the manufacturing process is also more complicated, so the price of quality TR 90 eyeglasses frame is more expensive than others. It is very important that the they are fully dried to a moisture content of less than 0.1% during processing, otherwise the product will be brittle or unsightly, and the raw material loss will be large. Tr90 Optical Frame,Tr90 Eyeglasses Frames,Tr90 Optical Glasses Frame,Tr90 Optical Spectacles Frames Sense Optical , https://www.senseyewear.com
In the field of liquid-solid separation, polypropylene needle-punched filter felts are usually used with liquid-solid separation equipment such as plate and frame filter presses, vacuum suction filters, belt filters, and centrifugal filters. It not only has the characteristics of good dimensional stability, high strength, small elongation, but also has a smooth and smooth surface, and has pores and high gas permeability. Therefore, it also has the unique advantages of low vacuum resistance, energy saving and easy cleaning. In the beneficiation, coal preparation, petroleum, chemical and other industries, where it is necessary to filter fine particles and ensure filtration, polypropylene needle felts are far superior to traditional woven filter materials.
The polypropylene needle-punched filter felt is generally made of 2.5--6D polypropylene short fiber as the surface layer, and the middle lining is made of polypropylene yarn or polypropylene high-strength yarn. It is formed by needle-punching reinforcement, calendering and shaping.
Polypropylene needle-punched filter felt is mainly used in the field of liquid-solid separation in metallurgy, mining, petroleum, chemical, chemical fiber, medicine, food and other industries.