The development of meltblown nonwovens-two-component meltblown technology

The American Hills Company and Nordson Company have successfully developed two-component meltblown technology earlier, including sheath-core, side-by-side, triangular, etc., usually the fiber size is close to 2u0026micro;, the number of holes per inch of meltblown spinneret components With 100 holes, the extrusion volume per hole can reach 0.5g/min. Skin-core type: It can make the non-woven fabric feel soft, and can be made into concentric, eccentric and special-shaped products. Generally, cheap materials are used as the core, and the expensive polymer with special or required properties is the outer skin layer. For example, the core is polypropylene and the outer skin is nylon to make the fiber hygroscopic; the core is polypropylene and the outer skin is a low adhesive layer. Melting point polyethylene or modified polypropylene, modified polyester, etc. For carbon black conductive fibers, the conductive core is wrapped inside. Side-by-side type: It can make the nonwoven fabric have good elasticity. It is usually made of two different polymers or the same polymer with different viscosities to make side-by-side bi-component fibers. It can be made by using different heat shrinkage properties of different polymers. Into a spiral crimped fiber. For example, 3M Company has developed a nonwoven fabric of meltblown PET/PP bicomponent fibers. Due to different shrinkage, spiral crimping is formed, which makes the nonwoven fabric have excellent elasticity. Tip type: This is another polymer compounded with trilobe, cross and tip. For example, when making antistatic, moisture-conducting, conductive fiber, you can compound with conductive polymer on the top, which can conduct moisture and conduct electricity. , Antistatic, and save the amount of conductive polymer. Micro-denier type: Orange petal-shaped, strip-shaped peeling type components can be used, or sea-island type components can be used. Exfoliation of two incompatible polymers to make superfine fiber nets, or even nanofiber nets, such as the exfoliated bi-component fiber developed by Kimberly-Clark, is a bi-component made of two incompatible polymers. The component fibers can be completely peeled off in hot water for less than one second to form a superfine fiber network. The island type has to dissolve the sea to obtain a fine island fiber network. Hybrid type: It is a fiber web that combines different materials, different colors, different fibers, different cross-sectional shapes, and even fibers in parallel with the sheath and core, which has both co-spun and two-component fibers, so that the fibers have various properties required . Compared with general meltblown fiber products, this kind of meltblown two-component fiber nonwoven fabric or mixed fiber nonwoven fabric can further improve the filterability of the filter media, and make the filter media have antistatic, conductive, hygroscopic, and enhanced The barrier properties, etc.; or to improve the adhesion, bulkiness, and air permeability of the fiber web. Two-component melt-blown fiber can supplement the shortcomings of a single polymer. For example, polypropylene is relatively cheap, but if used in medical and health materials, it is not resistant to radiation. In this way, polypropylene can be used as the core, and an appropriate outer layer can be selected. Radiation resistant polymer can be wrapped on the outside to solve the problem of radiation resistance. Therefore, the product can be cheap and can fulfill the functional requirements. For example, in the medical field, it can be used for the heat and humidity exchanger of the respiratory system, which can provide suitable natural heat and humidity. It has the advantages of light weight, disposable or convenient disinfection, low price, and can also play an additional role in removing contaminants. It can be composed of two uniformly mixed two-component meltblown fiber webs. The sheath-core two-component fiber is adopted, the core is polypropylene, and the sheath is nylon. Bi-component fibers can also adopt special-shaped cross-sections, such as trilobal and multi-lobal shapes, to make their surface area larger. At the same time, they can also use polymers that can improve filtration performance on their surface or blade tips. Olefin or polyester melt blown two-component fiber mesh can be made into cylindrical liquid and gas filters. Melt-blown two-component fiber mesh can also be used in cigarette filters; use wicking effect to make high-end ink-absorbing wicks; wicking rods for liquid retention and infusion, etc.