lye

Potassium di-hydrogen phosphate/di-Sodium hydrogen phosphate and potassium chloride/sodium hydroxide solutions were used for neutral liquor and alkaline liquor as buffer solution, respectively.

Since the desirable time for pulping is low, the absorption, shrinkage and swelling of Paulownia and Douglas fir woods were measured after placing them in neutral liquor and alkaline liquor for 315 minutes.

Neutral liquor had less absorption rate than alkaline liquor and the difference between the absorption rate of radial and tangential directions was obvious in the neutral liquor compared to alkaline liquor.

In addition, alkaline liquor caused more shrinkage and swelling than neutral liquor and similar to the absorption, the difference between the shrinkage and swelling rates of radial and tangential directions was obvious in neutral liquor compared to alkaline liquor.

Alkaline liquor caused more absorption, shrinkage and swelling than neutral liquor and the difference between the absorption, shrinkage and swelling rates of radial and tangential directions was obvious in neutral liquor compared to alkaline liquor.