Explain the principle and measurement method of hydrophilic non-woven fabric water absorption? Hydrophilic non-woven fabric factory

Principle of Hydrophilic Non-woven Fabric Due to processing characteristics and product cost, most non-woven fabrics have used synthetic fibers for a long time, and polyester and polypropylene are the most. In a few cases, synthetic fibers and natural fibers are mixed, but they cause poor products. Hydrophilicity. Non-woven fabrics have higher hydrophilicity requirements for medical and sanitary materials and materials used for wiping and wiping. In the medical and healthcare fields, disinfectant wipes, wound dressings, hemostatic strips, ribbons, gauze balls, ointment cloths and absorbent pads need to have good properties for absorbing blood and liquid drugs. Absorbent disposable materials, such as baby diapers, sanitary napkins, adult incontinence pads, have higher requirements for hydrophilic materials. There are disposable underwear, clothing lining cloth, shoe village cloth and other wearing materials, which can also have certain requirements for hydrophilicity. In the field of family health, all hydrophilic materials such as finger cloths for children, beautiful finger cloths and furniture, pipes, and cleaning cloths for cooking utensils can have corresponding requirements. In addition, many industrial fabrics such as battery separators are required to have high electrolyte absorption capacity, so hydrophilicity also puts forward certain requirements. Hydrophilic finishing is to cover the fiber surface with a hydrophilic agent to form a hydrophilic film to improve its hydrophilicity. The hydrophilic film has a certain degree of conductivity and can improve the antistatic properties of the material. The method is simple and easy to use, with mature principles. Water absorption test Non-woven fabric products for medical and health use generally have water absorption or hygroscopicity requirements, so a water absorption test must be performed. The water absorption is an important indicator of such products. The water absorption time or water absorption is often used to determine the water absorption of the product. (1) Determination of water absorption time The water absorption test method in the ASTM standard is as follows: a cylindrical metal mesh basket with open ends, 6.4am in height, 3.8cm in diameter, and 3g in weight, is woven with 20 gauge stainless steel wire. The mesh size is about 3cm×3cm. Take 5 samples along the machine running direction. The width of the sample is 76mm, and the length is based on its mass (5ょ0.g as the standard. The test is carried out at room temperature, and each sample is rolled into a roll with the same diameter along the length direction. Put it into a metal mesh basket with both ends slightly beyond the mesh basket. Then drop the mesh basket with the sample into a container of water from a height of 25cm, and record the time required for the entire sample to be completely wetted. Test 5 times , Calculate the average value, which is the water absorption time. (2) Measurement of water absorption (2) Measurement of water absorption First, take 6 samples of 203mm×203mm along the 45° oblique direction of the non-woven fabric. Such as fixed weight If it exceeds 80g/m2, 3 samples can be taken. The sample device uses galvanized metal wire woven into a metal mesh with a specification of 230mm×230m, and each mesh is about 12.5m×12.5mm. The quality is adjusted to the same value and prepared at the same time There are several deep dishes, each with a depth of about 80mm and a specification of about 254mmx254m. There are several shallow dishes, the size is to accommodate the metal mesh, and the quality is adjusted to the same. When testing, the dry sample is weighed at room temperature for accuracy To 0.1g, then put the sample on the metal mesh, fill the deep dish with water, the water depth is about 65mm, put the metal mesh with the sample into the dish, wait until the sample is completely wet, and then soak in the dish 1min, lift the metal mesh and sample out of the water, place them horizontally on a wooden rod or metal rod and let them drip for 10 minutes, then move them to a shallow pan and weigh them immediately, and subtract the shallow pan, metal mesh and dry weight from the resulting weight. The mass of the sample is the water absorption of the sample. The water absorption is calculated by the following formula: Water absorption of the sample u003d Water absorption of the domain sample/Dry weight of the sample x 100%