The process of melt-blown nonwoven fabric: polymer feeding---melt extrusion---fiber formation---fiber cooling---forming into the net---reinforcing into cloth. Environmental Slippers,Environmentally Friendly Slippers,Eco Slippers ,Eco Friendly Slippers YANGZHOU PENGYOU TOURISM SUPPLIES FACTORY , https://www.yzpengyou.com
The development of meltblown nonwoven technology - two-component melt-blown technology Since the beginning of the 21st century, the international development of melt-blown nonwoven technology has advanced by leaps and bounds.
American Hills and Nordson have developed successful two-component melt-blown technology, including sheath-core type, side-by-side type, and triangular shape. Generally, the fiber fineness is close to 2μ, and the number of holes in the melt-blown spinneret assembly can reach 100 per inch. Holes, the amount of extrusion per hole can reach 0.5g / min.
Leather core type: It can make the nonwoven fabric soft to the touch and can be made into concentric, eccentric and special shaped products. Generally, the cheap material is used as the core. The expensive polymer with special or desired properties is the outer skin layer, such as the core is polypropylene, the outer skin is nylon to make the fiber hygroscopic; the core is polypropylene, and the outer skin is low for bonding. Melting point polyethylene or modified polypropylene, modified polyester, and the like. For carbon black conductive fibers, the conductive core is wrapped inside.
Side-by-side type: It can make the nonwoven fabric have good elasticity. Usually, two kinds of different polymers or the same kind of polymers with different viscosities are used to make side-by-side bicomponent fibers. Different heat shrinkability of different polymers can be used. Spiral crimped fiber. For example, 3M Company has developed a melt-blown PET/PP bicomponent fiber nonwoven fabric which, due to the difference in shrinkage, forms a spiral crimping property, so that the nonwoven fabric has excellent elasticity.
Tail type: This is a composite of another polymer in the trilobal, cross and tip. For antistatic, moisture conducting and conductive fibers, it can be laminated on the tip to conductive polymer, which can conduct moisture and conduct electricity. , antistatic, and save the amount of conductive polymer.
Micro-denier: It can be used in the shape of a orange-shaped, strip-shaped or strip-shaped component. Using two incompatible polymer strips to form a microfiber web, even a nanofiber web, such as the split-type bicomponent fiber developed by Kimberly-Clark, is a double made of two incompatible polymers. The component fibers are in hot water for less than one second, and the two polymers can be completely peeled off to form a microfiber web. For the island type, the sea is dissolved to obtain a fine island fiber web.
Hybrid type: a fiber web with both co-spun and bicomponent fibers mixed with different materials, different colors, different fibers, different cross-sectional shapes, and even core-sheath fibers, so that the fibers have various properties required. . Such meltblown bicomponent fiber nonwoven fabrics or hybrid fiber nonwoven fabrics can further improve the filterability of the filter media and provide the filter media with antistatic properties, electrical conductivity, hygroscopicity, and reinforcement. The barrier property, etc.; or the adhesion, bulkiness, and gas permeability of the fiber web are improved.
Two-component meltblown fibers can supplement the performance of a single polymer, such as polypropylene is relatively cheap, but if used for medical materials, it is not resistant to radiation, so that polypropylene can be used as a core, and the outer layer should be selected appropriately. The radiation-resistant polymer is wrapped outside to solve the problem of radiation resistance. This allows the product to be inexpensive and functional, such as hot and wet exchangers for the respiratory system in the medical field, providing suitable natural heat and humidity. It is lightweight, disposable or easy to disinfect, inexpensive, and has the added benefit of removing contaminant filters. It can be composed of two uniformly mixed two-component meltblown webs. The core-core bicomponent fiber is used, the core is polypropylene, and the skin layer is nylon. The bicomponent fibers may also have a profiled cross section, such as a trilobal shape or a multilobal shape, to make the surface area larger, and a polymer capable of improving filtration performance may be used in the surface layer or the tip portion thereof. The olefin or polyester meltblown bicomponent web can be formed into a cylindrical liquid and gas filter. The meltblown two-component fiber web can also be used for cigarette filter nozzles; the high-end ink-absorbing core is used by the wicking effect; the wicking rod for liquid retention and infusion is used.
The development of meltblown nonwoven technology - meltblown nanofibers in the past developed meltblown fibers are based on Exxon's patented technology, but in recent years, many companies in the world have broken through Exxon technology to the development of finer nanofibers.
Hills has done a deep research on nano-meltblown fibers and is said to have reached the stage of industrialization. Other companies, such as Nonwoven Technologies (NTI), have also developed processes and technologies for the production of nano-meltblown fibers, and have patented them.
In order to spin nanofibers, the orifices are much finer than the orifices on conventional meltblown equipment. The NTI can be combined to a fineness of 0.0635 mm (ie 63.5 microns) or 0.0025 inches. The total width is more than 3 meters. The meltblown fibers thus spun are approximately 500 nanometers in diameter. The finest single fibers are up to 200 nanometers in diameter.
Since the melt-blown equipment for spinning nanofibers has a small orifice, if the measures are not taken, the output is inevitably greatly reduced. Therefore, the number of holes in the spinneret is increased by NTI, and each spinneret has three or more rows of spinnerets. hole. By combining many unit components (depending on the width), the yield can be greatly increased during spinning. The actual situation is that when using 63.5 micron holes, the number of holes per row of spinnerets in a single row is 2880. If three rows are used, the number of holes per meter of spinneret can reach 8640 holes, so that the output can be compared with spinning. Ordinary meltblown fibers are equivalent.
Because the thin spinnerets of high-density holes are expensive and fragile (heat-decomposed under high pressure), companies have developed new bonding techniques to enhance the fastness of the spinneret. Leakage under high pressure.
Nano meltblown fibers can be used as filter media to significantly increase filtration efficiency. There are also data showing that because the fibers in the nano-scale melt-blown nonwoven fabric are finer, it can be combined with a spunbonded melt-blown fabric with a lighter weight, and can still withstand the pressure of the same head, and the SMS products can be made of the same. Reduce the proportion of meltblown fibers.