Introduce the development of foreign meltblown nonwovens and equipment

　　 The meltblown fabric fiber is extremely fine, it has porosity and a certain strength, and the early use is a battery separator. Exxon Corporation (USA) developed a three-layer polypropylene hot rolled laminate for this application (US Patent No. USP4078124, etc.). Riegel Produucts' Roy Volkman industrially produced a polypropylene meltblown baffle for lead-acid maintenance-free batteries in the 1970s. However, the rewetting property and the abrasion resistance of the cloth have affected its application.

Toa Nenryo has successfully overcome some of these problems with alkaline battery separators (USP 4743494 and 5089360). Entek (USP 5,230,949) produced a separator web from a high load ultra high molecular weight polyethylene, the micropores on which were formed by extraction after spinning into a web. Asalu has also announced plans to open the huge nickel-cadmium battery market with its nylon microfiber web. The demand for long-life battery separators for electric vehicles may create a huge melt-blown battery separator market.

The microporosity and hydrophobicity of the polypropylene web make it a natural candidate for oil absorbing materials and crepe. Hydrophilic additives and their handling provide hydrophilicity, which enabled Ergon Nonwovens (USA), Sorbent Products, and Kimberley to begin production and sale of meltblown webs in the early 1970s. The market continues to grow at a rate of 7% to 8%. The replacement of glass fibers by meltblown fibers in masks and gas mask applications is now largely complete. Fibreweb (USA) has just obtained a patent (USP5645057) for the production of very fine (0.8-1.3 μm) fiber webs for this purpose.

In the filtration market, one of the early developments of meltblown webs was cigarette filters. The industrial production of meltblown cigarette filters has not been successful so far, but development work continues. Meltblown webs have achieved great success in other more conventional air and liquid filtration applications. Kimberly of Kimberly-Clark has obtained a patent on shaving filter material (USP4714647); Pall recently obtained a patent for melt-blown filter material for blood filtration (USP5582907); JNIL obtained direct processing of polymer into finished tubular filter Patent (USP 5,409,642); Akzona has obtained two patents (USP 4,667,763 and 4,247,498) using the Exxon meltblown process, which can extrude solutions and form a film that separates white blood cells from blood.

Kimberly-Clark has achieved many important innovations, and the company's Brock SMS (spunbond/meltblown/spunbond) patent opens up a huge market for medical fabrics and surgical wraps. Kimberly-Clark's patented CoForm technology has been widely used on crepe. Similar applications have been applied by 3M (USA), which has commercialized Thinsulate insulation materials, which, in addition to outdoor sportswear and underwater diving suits (recently launched), appear to be used as cable insulation.
Biax FiberFilm (USA) uses melted polyester bottles to produce meltblown building insulation; Tandec (the University of Tennessee Textile and Nonwoven Development Center) has achieved an excellent electrostatic charging patent (USP5401446) that allows The filter material exhibits higher filtration performance at lower pressure drop; other companies use triboelectric effect to charge, here are two different negatively charged polymers; BBA (USA) polychlorotrifluoroethylene sprayed Halar High temperature filtration is also turned on.

Kuss Filtration has also introduced Stratopore PDM fuel filter media using three layers of nylon 6 meltblown webs of different fiber sizes. Fibreweb (USA) disclosed the innovation of liquid crystal meltblowning for high temperature filtration on November 7, 1995. Freudenberg (Germany) has also announced meltblown webs for cab filtration.
Kimberly-Clark is the first company to produce elastic meltblown materials. Toa Nenryo and Kura have used thermoplastic polyurethane to produce elastic meltblown fabrics for use in hospital gloves and the like.

In China, asphalt is currently used as a raw material to produce meltblown raw material fibers for medium modulus and low carbon fiber. Some companies are now experimenting with the production of artificial leather by meltblowing. An increased use is to adhere a thin layer (2.0 g/m2 or less) meltblown product to a nonwoven fabric to improve shielding and appearance, thereby greatly increasing the value of the base fabric.

Two: the development of melt-blown equipment

　　 For nonwoven products, equipment that is precisely manufactured and can be industrially produced is required, especially for meltblown equipment. Here, key parts (die, nozzle, gas transmission components, and netting devices) are extremely important. Accurate Products (USA) is the first company (USP4986743) to successfully manufacture 40in molten fountain die in strict accordance with Exxon specifications.

In the early 1990s, JML (USA) successfully modified the conventional meltblown die by melt-blown the meltblown die into several 1~2 in parallel devices to melt the hot melt onto the base fabric. These side-by-side devices each have an internal valve and the die has a quick change sign. This has opened up a huge new market for "fat fibred" meltblown fibers (USP 5145689, 5692884, etc.). JML later applied for a new process patent for online production of SB, MB, SMS and SMMS, which took advantage of the company's earlier patent for rapid conversion process (Multifil composite wire system). JML has also recently applied for a patent, including most of its latest developments in the combined hot melt adhesive die (DuraFiber system) used to form different fiber patterns. Patent USP 5,618,566, to JML, relates to the construction of a modular meltblown die having a side-by-side interchangeable assembly on a manifold. This configuration allows the die length to be easily changed by adding or subtracting components.

Reifenhauser GmbH (Germany) has designed and manufactured an improved structure for the meltblown die (USP 5248247) and an improvement for the production of stretched and heat set coarse fiber meltblown webs that are claimed to be highly productive. Structure (USP569808). The company also designs and sells SMS (spunbond/meltblown/spunbond) lines.

3M Company (7 US) obtained patents on non-woven fabric equipment for producing high temperature stability