Abstract
This paper deals with the dimensional stability of paper containing high-yield pulps. The water retention value of some high-yield pulps, hardwood bleached kraft pulp (LBKP) and stone ground wood (SGP), the wet expansivity of the sheets and the effect of drying conditions on the sheets were studied. The results obtained are summerized as follows.(1) The wet expansivity of the sheet made from hardwood high-yield pulps with a yield 82 to 85%, in spite of low density, was as large as that of the sheet from LBKP. This result was found to be caused by the high water retention value of the fines fractions in those high-yield pulps.(2) During drying without tension, the shrinkage of the high-yield pulp sheets was equal to that from the LBKP sheet. But the shrinking stress of the sheets was much smaller than that of the LBKP sheet. For that reason the shrinkage of the sheet from those high-yield pulps was very dependent on the tension during drying.(3) The dimensional stability of the paper containing high-yield pulps was more affected by the drying conditions on the paper machine.
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