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PVA for Paper Industry
PVA HWF-17 is usually used as a surface treatment agent for
paper and paperboard. When higher coverage isrequired, HWF-05 or HWF-08 may be
applied. A sizing solution of 2-5% is used, with a plasticizer for example
glycerol, an insolubilizer for example glyoxal and defoamer added to the
solution. A wax emulsion (10-50% of the weight of PVA ) may be added to
prevent sticking to the dryer and staining on the calendar roll.
Metallic stearates and rosins may also be applied.The applications of PVA
for paper industry are listed as follows.
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.