4. Conclusions
Distiller’s grains extracted gum was tested as binder for
paper coating formulation and compared with traditionally used
polyvinyl alcohol. The results of the tests show that DG gum
based samples were closely comparable to PVA samples for most
of the tests conducted, except wet strength test and optical
tests for brightness and color. However, based on Cobb tests
modified DG gum based coatings showed improved water resistant
properties than DG gum and PVA based coating exhibiting
lower water absorptivity and water vapor transmission rates at
equivalent coating weights and comparable wet strength values
to PVA based coating. The utilization of hemicellulose from
DG increases the value of distiller’s grains as animal feed and
improves the overall value of corn by generation of additional revenue.
Implementation ofthis binder system as either a replacement or
as part of a formulation with synthetic binders would allow paper
makers to improve their water resistance properties. Additional
work would be required for any system to maximize coating solids
while maintaining acceptable rheological properties. However, as
thesematerials are basedonnaturalproducts,lower environmental
impact and cost may be realized.