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High-density papers are made of extensively refined chemical pulp. Due to the sealed pores and layered structure it offers interesting possibilities in the packaging structures. HD papers can be coated with aqueous barrier dispersions and polymer melts. As a result, a material with e.g. very low gas transmission rates can be created. Refining and calendering have an effect on the paper structure. This can be seen as changes in the pore size distribution measured by mercury intrusion method and also in the barrier properties. Dispersion coating can be done with various techniques used commonly in pigment coating and converting. It is shown that the properties of these coated papers can be affected both by pre- and postcalendering. As shown, this depends on the coating composition and coating method.
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Available for Purchase – Conference Proceedings
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Dispersion Barrier Coating of High Density Base Papers, 1998 Coating Conference Proceedings