PP staple fiber application field

Non-woven fabrics and polypropylene fibers for medical and sanitary purposes

Polypropylene fiber nonwovens can be used in disposable sanitary products such as sanitary napkins, surgical gowns, hats, masks, bedding, diaper fabrics, and the like. Women's sanitary napkins, disposable babies and adult diapers have now become common products for everyday consumption. In addition, the chemically or physically modified polypropylene fiber can have various functions such as exchange, heat storage, electric conduction, antibacterial, deodorization, ultraviolet shielding, adsorption, desquamation, isolation selection, agglutination, etc., and will become an artificial kidney. Important materials in various medical fields such as artificial lungs, artificial blood vessels, surgical lines and liquid-absorbent gauze. Labor insurance clothing, disposable masks, hats, surgical gowns, quilt pillowcases, padding materials, etc. have a growing market.

The PP staple fiber sanitary product has a fiber thickness of 1.5 to 2.5 dtex, and the above ground fabric fiber has a thickness of 5 to 10 dtex. The length of the fiber is 1.5-200.0 mm, depending on the use of the fiber. The short fibers used as concrete have a length of 1.5-200.0 mm, the length used as a diaper is generally 40.0 mm, and the length used as a ground fabric is 60.0 mm.

PP staple fiber performance characteristics

(1) Light weight

Polypropylene fiber has a density of 0.90-0.92 g/cm3, which is the lightest among all chemical fibers, 20% lighter than nylon, 30% lighter than polyester, and 40% lighter than viscose fiber, so it is suitable for winter clothing. Fabrics such as floccules or ski wear, mountaineering suits, etc.

(2) high strength, good elasticity, wear resistance, corrosion resistance

The high strength of polypropylene (the same under dry and wet conditions) is an ideal material for making fishing nets and cables; its wear resistance and resilience are good, its strength is similar to that of polyester and nylon, and the rebound rate is comparable to that of nylon and wool. Lun, viscose fiber is much larger; polypropylene has poor dimensional stability, easy to pilling and deformation, anti-microbial, and flawless; chemical resistance is superior to general fiber.

(3) Electrical insulation and warmth

Polypropylene fiber has high electrical resistivity (7×1019 Ω·cm) and low thermal conductivity. Compared with other chemical fibers, polypropylene has the best electrical insulation and thermal insulation, but it is easy to generate static electricity during processing.

(4) Poor heat and aging resistance

Polypropylene fiber has a low melting point (165 to 173 ° C) and has poor stability to light and heat. Therefore, polypropylene has poor heat resistance and aging resistance and is not resistant to ironing. However, it is possible to improve the anti-aging property by adding an anti-aging agent at the time of spinning.

(5) poor hygroscopicity and dyeability

The hygroscopicity and dyeability of polypropylene fibers are the worst in chemical fibers, hardly hygroscopic, and their moisture regain is less than 0.03%. Fine-denier polypropylene has a strong wicking effect, and water vapor can be removed by capillary tubes in the fiber. After the garment is made, the comfort of the garment is good, especially the ultra-fine polypropylene fiber, which can transmit sweat more quickly and maintain the comfort of the skin due to the increased surface area. Because the fiber is not hygroscopic and the shrinkage rate is small, the polypropylene fabric has the characteristics of easy washing and quick drying.

The dyeability of polypropylene is poor, the color is light, and the color fastness is poor. Ordinary fuels can not be dyed, and most of the colored polypropylene is produced by pre-spinning. The raw liquid coloring, fiber modification, and the fuel complexing agent may be blended before melt spinning.