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PVA is usually processed in the form of aqueous solution. Since the solution is slightly acidic (pH 5~7), vessel
should be made of materials, which will not contaminate the solution with corrosive material or rusts. Stainless
steel vessel, enameled containers or polyester tanks are recommended.
The specific gravity of PVA is ranging from 1.26 to 1.31, which is heavier than that of water. Low agitation speed
or unfavorable agitating condition sometimes causes coarse particles to precipitate and to block the outlet of
the dissolving tank. Hence, a flush valve or tank valve is recommended to be installed in the bottom of the vessel to prevent the particles from blocking the discharge line.
(1) Viscosity of a 4 wt % standard grade PVA solution at 20°C which is determined by Brookfield Viscometer
with UL adapter.
(2) Calculated as Na2O
(3) pH is determined by pH meter at 20°C
(4) Viscosity of a 10 wt % tackified grade PVA solution which is determined by Brookfield Viscometer at 25°C
(5) Particle size of standard grades is all passes through 10-mesh screen.
■ High weaving efficiency.Yarns sized with PVA show excellent weaving efficiency with few loom stops.
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