The reaction which carried out in non-swelling medium is influenced by the diffusion rate of reagants into cellulose fibers. That the Sakurada's equation.x=kz^m, is applicable for acetyl reaction is well known. In order to study the acetyl reaction of hornified cellulose, constants m and k of Sakurada's equation are compared for many pulps which purified under various conditions. For high reactive pulps m is smaller than poorer one, but k is higher than the latter. Moreover constant k and m are changed during acetylation for poor reactive pulps. And m of hard fornified pulps is almost equal to that of the fiber formurous acetylation.

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On the drying-part of Yankee Cylinder Machine, melamine or urea melamine formaldehyde was sprayed onto paper. The treated paper manifested the same treatment effects as -mentioned in the 7th and 8th reports, but attention should be paid to the following points when the paper is treated :
I. Treatment-spots is addition-spots must be lost.
II. Waste percentage of resin is small, but the paper becomes hard and stiff.
III. When the dryer turns around rapidly, it becomes more difficult to tear off the paper from the surface of the dryer, because the dryer has turned round before the paper is completely dried, as in the case of giving too much resin liquid in order to make the resin added % on paper greater.
Further, when the treated paper was twisted, there were recognized such influences of moisture, weight of the traveller, and twisting-number, as mentioned in 3rd and 4th reports. But this influences are not so marked as with the untreated paper. It seems that as fibres can stick together owing to the effect of resin and so there is no slipping out among fibres, it becomes difficult for fibres to take the axis direction of the yarn.

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