Honshu Chemical Industry (Japan)

日本経済の進展と共に過去四半世紀において包装資材・容器の出荷量は約倍増, 出荷金額においては約5倍増となっている。平成4年の出荷金額は6兆7,200億円で紙・板紙製資材・容器はその44% を占め段ボールが24%, 紙器が12%ついで包装紙、製袋原紙5%となっている。包装の形態としては, プラスチックの利用増, バリヤー性樹脂の利用, 紙とフィルムの複合化, そして各種高機能化が図られ商品の保護機能, 便利性に関する諸機能, 販売促進機能は大きく伸展した。しかし, 一方では包装資材・容器の環境に与える影響がクローズアップされ, 包装材料の減量化及び減容化, リサイクル性, 焼却性, 自然崩壊性等が商品設計の大きな要因として注目され, さらには包装資材が製造され, 使用され, 廃棄処理された後までの一連のライフサイクル環境に与える負荷も考慮され始めている。紙・板紙容器素材の開発動向を特許出願から分析すると, 耐水性, 耐油性, 防湿性, 蒸着, ヒートシール性, ガスバリヤー性, 易開封性, 易滅菌性等は継続して研究されているテーマと言える。平成 3 年以降に出願の多い特性は, 防湿性, ヒートシール性のような物理的特性の他, 匂いの移行防止・保香性・味, 美粧性等の感性に関する機能, また易廃棄性, リサイクル性, 自然崩壊性, 脱アルミ等環境に関する特性があげられる。今後, 容器・包装リサイクル法また消費者保護の立場に立つPL法などの法律がこれまで以上に包装設計に影響を与えるであろう。また各種の規制緩和と国際化が進む中, 物流形態は流動的で予想しきれない面が有るため柔軟な対応が求められよう。

L-1 machine started up in 1974 at kushiro Mill Honshu Paper Co., Ltd to correspond to increase in demand of Liner board.We will report the operating experience of Bel bond Former installed in 1984 and E.N.P in 1991 in L-1 machine.This installation provided high productivity for us.

The application of new material sheets have been increasing in various fields recently. These sheets are made by wet-laid or dry-laid paper making processes. New material sheets have high performances derived from the material itself. Also, these sheets are porous, light weight, and have good convertibility and cost merits. Some application examples such as electrical parts, construction meterials, heat resistant materials, composite materials, and electrical conductive materials are shown in this paper.

Application of enzyme to the kraft pulp bleaching was investigated to reduce the amount of AOX generated during bleaching.The pulp which had been pretreated with xylanase was bleached using several sequences and the qualities of the resultant pulps were compared with one another.As a result, it was found that the pretreatment with xylanase enabled to reduce the amount of chlorine or chlorine dioxide at the first stage by 20 to 25% without any adverse influence on the pulp quality.The reason why the brightness was improved owing to the treatment with xylanase is considered to result not only the reduction of the kappa number of (D/C) E pulp, but also the improvement in the bleachability in a subsequent stage.Reference is also made to a non-chlorine bleaching trial on the mill scale using the xylanase.

Solvolysis pulping, named for the method of extracting lignin from wood chips using a mixture of cresol and water has been studied as one of the organosolv pulping systems to separate the pulp. In this study, alkalis (NH3, NaOH) were added in the amount of 0.1-0.2 equivalent to that of cresol used in the cooking to evaluate the time dependences of the degree of delignification and decarbohydration. Both alkalis increased the reaction selectivity of delignification relative to degradation of carbohydrate because of reduced degradation of xylan component in wood.

Duoformer H had been instlled on existing foundrinier of No. 3 printing paper machine at Kushiro Mill, Honshu Paper Co., Ltd.After resolving some troubles at the begining, We have been operating them successfully.In this report, the summary of performance characteristics and paper quality are described on the basis of Operating experience for last about three years.

Surface chemistry is now an important method in studies of coated paper. Several techniques have been studied in order to determine the binder concentration in coating layer because the binder migration is one of the major interests in coating technology. Resently, a technique for the analysis of SB-latex concentration on the surface of coated paper was developed. With this method, SB-latex concentration is measured by reflected ultraviolet absorption, and the surface latex profiles as well as its concentration are obtained.In this paper, the fundamentals, the system control, and applications of this technique comparing with ESCA are reviewed.

Birch chips, treated with bisulfite at various yield (70-90%), were fiberized in the Asplund Laboratory Defibrator D (as the first refining) and refined in the PFI mill (as the second refining) to produce CTMP.The effects of pretreatment yields and refining temperatures on the fiber length distributions and fiber surface structures of CTMP were discussed. In addition, the relationships between morphlogical properties of the fines and the sheet strength properties were discussed.At the yield of pretreated chips less than 84%, the fiber wall of the pretreated chips were ruptured between the primary wall and the middle lamella on the fiberizing stage, and then the fibers were seperated without damaging. The fines generated on this stage consisted of the ray cell and the flake-like fragments which were derived from the middle lamella and the primary wall layer.At the yield of pretreated chips more than 90%, the pretreated chips were fiberized in a similar manner descrived above. However, the presence of fragments derived from the cell wall was found in the fines fraction.In the case of various yields, there is no significant differences in the long fiber (> 48 mesh) contents of the pulps produced on the fiberizing stage.When the defibration temperture decreased from 130°C to 100°C or 20°C, the fibers were significantly damaged during the fiber seperation, and the contents of the long fiber decreased.Fiber surface structures and the fiber length distributions showed that the fibers produced from the pretreated chips with a yield of 93% were subjected to destruction on the refining stage, and decreased the long fiber contents. The fines generated on this stage contained more fiber wall fragments.This tendency was reduced with decrease of the pretreatment yield, and a larger portion of the fines consisted of the fillament-like fragments which were derived from the secondary wall by peeling from the fiber surface.The fines generated on the fiberizing stage were less effective to the sheet strength properties. On the other hand, the fines generated on the refining stage consisted of the fillament-like fragments which derived from the secondary wall, and were more effective to the inter fiber bonding.