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Sizing is a multi-element liquid system consisting of film former, coupling agent and other functional additives. In this article, Taguchi method with orthogonal array design was used to get an optimal formula of sizing for basalt fiber, and the role of film former in sizing was studied. The results showed film former promoted the sizing to spread on fiber surface, which increased the interaction area between the fiber and sizing. With the assistance of film former in sizing, a uniform layer was formed on fiber surface, which repaired the surface defect on basalt fiber with reduced stress concentration. The sizing with an appropriate concentration of film former had the capability to increase the tensile strength of a single filament with the best effect of forming a film on fiber surface.

Formula development of sizing for basalt fiber. Part I: Role of film former