Daiwabo Co., Ltd. has developed "antivirus nonwoven fabrics" with the effect of reducing the amount of bird flu virus by 99.99% every minute in cooperation with Mochigase Electric Co., Ltd. and Tottori University. This product is a new material produced by a new manufacturing process to fix antivirus agents with a special finish to natural mineral "dolomite" onto the surface of fibers. Reportedly, this new product has considerably improved functionality and durability in comparison with conventional processes.
In the implementation of this development, Mochigase Electric conducted research under its "project for innovative technology development" for fiscal 2004 based on the contract with the Japan Science & Technology Agency, in close cooperation with Daiwabo and Tottori University. The research theme is the "applied development of a new material through the treatment of dolomite having antivirus functions."
The research group of Professor Koichi Otsuki (virology) at the Department of Veterinary Microbiology, Faculty of Agriculture, Tottori University performed the antivirus testing. This group implemented the antivirus testing by allowing antivirus nonwoven fabrics to contact bird influenza (H5 type) in the form of liquid at 4oC. In the case of specimen A (an immediate effect type), the amount of viruses with the power of contagion diminished by 99.99% within a minute. In the case of specimen B (a continuing effect type), the number of virus diminished by 99% within a minute and by 99.999% after 15 minutes. Furthermore, the experiment conducted on a specimen left alone in a condition of being exposed to the open air for 30 days showed that the amount of viruses decreased by 99.99% after 15 minutes. If closed tightly, then, the durability of the effect will hopefully continue for 3-5 years.
This experiment has proved that these antivirus nonwoven fabrics could sterilize bird flu viruses by contact with them. Furthermore, these antivirus nonwoven fabrics display a much higher performance than conventional products, namely, nonwoven fabrics coated with adhesive resin, in addition to the longer period of effective durability. Consequently, the range of applications has expanded.
First, the research group centering on Professor Otsuki at Tottori University and Mochigase Electric has developed antivirus agents capable of reducing the amount of bird flu virus substantially by applying a special finish to the natural mineral dolomite, after heat treatment followed by a delicate finish onto the surface. Then, the group successfully developed nonwoven fabrics fixed with these antivirus agents.
Generally, conventional technologies on methods to fix functional particles onto the surface of fibers are: (1) the fixing method by using adhesive resin and (2) the kneading method into fibers during the fiber manufacturing process. These methods, however, failed to perform the proper function satisfactorily after fixing because adhesive resin or fiber resin covers the surface of articles.
Daiwabo employs bicomponent fiber comprised of a dual structure, core and sheath, in order to prevent antivirus agents fixed onto the surface of fibers from being buried into fibers. The sheath portion consists of approximately a 5-micron meter thick special resin capable of making contact adhesion for antivirus agents. By providing a special finish to this bicomponent fiber, it has become possible to retain antivirus agents in an exposed condition on the surface of fibers. This method can improve functional properties and expand the period of durability to 30 days from seven days in the case of a conventional product.
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