Other

Nippon Paper Industries Co., Ltd.

Kawasaki Kasei Chemicals Ltd.

Makoto Nakao

Yasunori Nanri

Keigo Watanabe

Tatsuya Andoh

Junji Tanaka

Kazuaki Sakai

A lignocellulose material is cooked by means of an alkaline cooking liquor containing polysulfides in the presence of a quinone-hydroquinone compound, of which the oxidation-reduction potential in the form present during the cooking, which potential is a value calculated as a standard oxidation-reduction potential (Ea) with a hydrogen ion activity of 1, is within a range of from 0.12 to 0.25V to the standard hydrogen electrode potential. It is thereby possible to cook the lignocellulose material with a low Kappa number and in good yield and at the same time, to reduce the amount of the chemical solution used and to reduce the load on a recovery boiler.

Cooking method for pulp

Mouthpieces disposed in a mouth between a lower lip, teeth and gum, for example, are mounted to a force measuring device . An outer mouthpiece disposed at the lip side is connected via a connecting shaft to a shaft , which is a force measuring portion of the force measuring device while an inner mouthpiece disposed at the side of a tooth row is connected to a main body of the force measuring device via a connecting shaft and a mouthpiece-mounting bracket . When the mouthpieces are disposed between the lower lip, teeth and gum and the lips are closed, the outer mouthpiece is pulled by the lip. The force pulling the outer mouthpiece is the lip pressure, and the lip pressure at a rest position and the maximum lip pressure (the pressure of a tongue when the mouthpieces are disposed at the side of a body of tongue) of an examinee are displayed on a display of the force measuring device

Muscle pressure measuring instrument for mouth cavity, adapter for mouth cavity muscle pressure measuring instrument, and mouth piece for mouth cavity muscle pressure measuring instrument

In a process for producing kraft pulp, the process is made closed, the yield of pulp is improved and environmental problems are minimized. An alkaline solution containing Na S which flows in a process of producing kraft pulp, is electrolyzed by an electrolytic oxidation method; a liquid which is formed at an anode side and contains a polysulfide type sulfur in an amount of 6 g/l or more, is added, as it is or after being causticized, to the process before a chip has the maximum temperature, and a NaOH solution formed at a cathode side, is added to at least one step of the process after the chip has the maximum temperature till a final bleaching stage; and at least chemicals in the step wherein NaOH is added, among chemicals discharged in all steps from a cooking step till the final bleaching stage, are recovered and reused.

Method for recovering chemicals in a process of producing pulp by kraft process

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Chiyoda-ku, Japan

Makoto Nakao