We all know that the water-repellent and oil-proof needle felt has a waterproof function, which is inseparable from the fiber properties of the water-repellent and oil-proof needle felt. Today we introduce the fiber properties of the water-repellent and oil-proof needle felt.
(1) Wave coefficient of wool fiber
Wool fiber has a higher tensile deformation ability and a larger longitudinal deformation coefficient, namely the wave bar coefficient. When the wool fiber is subjected to a small external force, it can also cause significant longitudinal deformation. Therefore, wool fibers can also cause deformation motion of hair roots under a small external force.
(2) Hair fiber scales
The scales of the hair fibers grow from the root end to the tip, forming a non-impedance coefficient of the direction of the root fibers of the hair fibers and slightly positive, slightly larger than the root direction. When the wool fibers are affected by external forces, rapid production: less movement of the hair roots to move forward and crawl. The southerly of the scales of wool fibers, the hair fibers are easier to crawl forward under the action of external fibers. The larger the scales of wool fibers, the faster the crawling speed. If the fine wool scale is high, the velvet is better. The autumn wool fibers are thicker and straighter, and the scales are larger. When the hair roots are crawling forward, they are subject to sharpening by the knife school. Tian Tian has a quicker velvety. Due to the presence of scales on the wool fibers, the wool fiber blocks are in the piled up. The scales of the individual hair fibres are hooked with one another, so that the fluffing and the hair-bulk body of the knot-knot shield have a high mechanical strength, which is a characteristic that any fiber does not have.
(3) Wool crimp
Hair fibers have natural curling properties. When the hair fiber is produced by the external force and the root end is crawling forward, the crawling track is not a linear shape, but a curvilinear, occasionally changing disorder. Because the wool fibers are crawling in space, the fibers are entangled and interwoven, and the wool fiber blocks after shrinking have a certain geometric shape and strength. The higher the degree of curling of the wool fibers, the higher the breaking strength of the felt, the more firmly the felt knots and the lesser the hair loss. Therefore, in the production of filter felts, it is generally produced using fine wool with a high degree of curl.