| 摘要 |
This invention relates to plexifibrils made by flash spinning of overheated pressurised aqueous solutions or gels of technical polyvinylalcohol. After the extrusion of threads of overheated pressurised aqueous polyvinylalcohol solution in an expansion space water steam is flashing out causing bubble formation in the thread, their growth and finally their fracture. As a result, the polymer will be transferred in very fine fibrils with characteristic three dimensional network structure, called plexifibrils. They can be deposited at a foraminous conveyer belt in form of plexifibrillar nonwoven sheets, which can be partially cross-linked to be made resistant against boiling water. The polyvinylalcohol plexifibrils and nonwoven plexifibrillar sheets made of them can be used for manufacturing of protective clothing, envelopes, bags and similar. |
