2011年5月 紙パ技協誌

Vol.65, No.5 Abstracts

Operational Data as a Source for Understanding the Trend of Technological Development

Kiyoaki Iida
Executive Director emeritus, JAPAN TAPPI

  We believe that describing how one technology has been developed is helpful for inventing and developing new technology in the future. So, JAPAN TAPPI has been working to publish them in a series of booklets entitled “Technological development in 30 years in the Japanese paper industry”.
  Though these descriptions or the reviews are readily understandable, they are converted information in some ways and need to be verified by real data in mill operation. We are interested in those operational data in mills as information of the first order. Then, how to summarize them, usually of very large amount, in an accessible form is a problem. One suggestive method is to convert them in a chronological table. Though the table is usually a history of one specific operation unit, it represents the trend in general and supports the historical reviews as well. Following four examples, newsprint machine, linerboard machine, power plant and recovery plant, demonstrate that the chronological table of each specific unit is as informative as the historical review of the technology.

Growth and Wood Properties of Eucalypt Elite Trees for Pulp Production

Shinichi Onogi, Kazunori Hayashi, Eiji Iwata and Akiyoshi Kawaoka
Research and Development Department, Agri-Biotechnology Research Laboratory,
Nippon Paper Industries Co., Ltd.

  Improving productivity of existing plantations is essential for commercial afforestation because the land available for plantation is limited and profitability of companies which conduct afforestation and woodchip production. Therefore, higher woodchip yield per unit square of plantation and higher quality of woodchip are in demand. Clonal plantation is considered to be one of the most effective ways. In clonal plantation, elite trees with high growth and good property as pulpwood in given land are selected. Then seedlings produced by clonal propagation are planted.
  In this report growth and wood properties of eucalypt elite trees candidates and of same clones with different growth are investigated.

Improvement of Water Quality and Wet End in a Board Machine with a New Microbial Control Concept

Hiroki Katsura, Katsuhiko Hidaka and Hiroyuki Suzuki
Kurita Water Industries Ltd.

  Recently, closed and alkali papermaking process and increasing corrugated used paper as furnish result in the increase of chemicals, pulp, energy and effluent treatment costs. Here, we show the newly microbial control technique, using Fuzicide which can contribute to decrease those costs and increase productivities by improving water qualities throughout the process and wet-end.

The Automatic Counts Monitor System of the Capture Insect

Satoshi Motosugi
Ikari Corporation

  The present standard insect capture device is light inducement-style catching insect device.
  The function of the light inducement-style catching insect device induces an insect by light and captures it with the adhesion paper.
  In addition, the investigation method of the standard insect habitation situation installs light inducement-style catching insect device in the investigation point for a certain period of time (about 1 month) and performs it.
  The person in charge collects the adhesion paper for a certain period of time (about 1 month) after progress and identifies calculation of the number of the capture and a captured kind.
  We perform prevention measures on the basis of these findings to plan maintenance of the on-site hygiene management, improvement.
  However, it depends, and quick prevention measures are necessary to find relief and the security of the product which is recent user needs.
  I introduce new light inducement to enable an anti-quick prevention measure-style catching insects device this time.

New Board Machine Start Up in Vietnam

Kazunari Sato
Paper Machine Engineering Dept., Voith IHI Paper Technology Co., Ltd.

  VKPC (Vina Kraft Paper Co., Ltd.) PM#1, the largest paper machine for liner and corrugating medium in Vietnam, started its operation in Apr, 2009, supplied by Voith IHI Paper Technology Co., Ltd.
  The majority of paper machines in Vietnam are still in process of development. The start up of VKPC PM#1 with state-of-the-art technology is remarkable news in the industry of paper business.
  This paper will introduce the outline of project including the specification of Paper machine, installation and start-up phase.

Factors Influencing Surface Strength of Coated Papers

Peter Dahlvik, Guillermo Bluvol, Karl-Heinz Kagerer and Manfred Arnold
Omya International AG

  This paper focuses on the influence of different coating color parameters on the surface strength of pilot coated paper. Pick resistance was determined in full-scale sheet-fed offset printing. A tailor-made printing method including a special printing plate and the usage of high-tack inks was developed with the objective to evaluate the impact of different coating parameters on surface strength mainly in terms of edge picking. Evaluated parameters include the solids content of the coating color, the type, fineness and particle size distribution of the pigment and binder level.
  The developed full-scale printing test method provided clear differentiation related to the investigated parameters and it was possible to correlate this differentiation with lab test data on ink-coating interaction. It was shown that binder level can be optimized for cost savings while keeping sufficient pick resistance by maximizing the solids content of the formulation. In addition, clear differences related to the type of pigment were detected. Other lab tests showed poor or no correlation with the observed degree of edge picking.

Lanolin, Wool Wax and Surface Coating

Hiroyuki Kawashima
Croda Japan KK

  Lanolin is a wax sticking to sheep wool as lipid ingredient. A lipid ingredient included in the sheep wool was known for a gentle and protective for the skin from ancient times. The extraneous matter of the wool was a woolen grease-shaped thing called wool grease and named Lanolin as a refined matter. The wool grease sticking to wool is different from the oils and fats which seem to be the lipid from tallow and lard. It looks like epidermal lipid which is waxy solid. The ingredient has complicated variety and unique physicochemical characteristic such as cosmetic, pharmaceutical basis, rust preventative, agent for textile, the softener of chewing gum, etc. are developed, and the new application using Lanolin are developed. The main application is surface processing, and we can expect development of the paper manufacture industry.

A New Development of Density Decreaser for Paper
-MUSCUT Series-

Yasuo Mori and Hajime Saito
Global Market Innovation Department, Research & Development Division,NICCA CHEMICAL CO., LTD.

  Low-density paper called “KASADAKA-SHI”, which is characterized by its lighter weight & higher-caliper than conventional paper, is currently used in a wide range of products such as book paper and paperboard. Low-densification enables paper to provide not only advanced functions like the increased bulk by weight reduction as well as increased paper caliper and the improved qualia like handling and page-turning, but also the weight reduction without caliper change which is widely noticed from the environmental point of view due to the restraint of deforestation by reduced consumption of virgin pulp. Decreaser for paper is currently widely employed in various techniques as additive to achieve the low-densification of paper from among other options.
  NICCA CHEMICAL has launched cationic type decreaser for paper called “MUSCUT K-300 series” which features advanced modification effects like sizing, enhanced opacity and softness as well as bulk. However MUSCUT K-300 series still has defects to be improved, such as reduced paper strength and inconsistent compatibility of the combination with anionic agents. Our continuous elaborate works enable us to develop new nonionic type decreaser for paper called “MUSCUT N-800” which features suppressed reduction of paper strength and improved compatibility with other combination agents.
  In this paper, we report on the features and practical applications of MUSCUT N-800.

Hardness Measuring Instrument for Roll Quality Profiler
-Wireless RQP, Online RQP-

Osamu Suzuki
Nomura Shoji Co., Ltd.

  Roll density or hardness is the most important factor in determining the difference between a good and bad roll. The defects such as corrugations caused by non-uniform roll hardness profiles are a major cause of lost production for producers and converters. A reliable measurement of the roll hardness profile is of critical importance in deciding whether a roll is good or bad. Production staff needs to be able to test and figure out the results as efficiently as possible.
  TAPIO Roll Quality Profiler is designed for fast and accurate measurement of paper roll and machine roll hardness profile. The measurement device includes hardness measuring unit and distance sensor. RQP is the fastest and the most accurate system to detect reels that need to be excluded in printing or converting processes.

Development of the Special Boring Machine for the Roll with High Precision
-Original Method for Producing Well-balanced Roll with Uniform Wall Thickness-

Yusuke Nakagawa
Production Technology Section, Nomura Plating Co., Ltd.

  As one of needs for paper machines increasing running speed is required. One way to realize high speed running, uniform roll production of the outer shell thickness is needed. Namely, inside diameter size precision is high, at the same time, there is not machining gap of central part.
  Until recently, standard method of machining is honing after the inside diameter processing of the roll. By this method it is the limit of increasing of machine speed, caused by wobble.
  So we have begun to develop a new technique in purpose for getting cylindrical precision and minimizing surface roughness.
  At our company we have adopted a honing less processing from single side instead of the conventional processing from each side. And we have succeeded in producing the new machine, realized to product the roll with uniform wall thickness, increased cylindrical precision and obtained surface roughness.
  As a result 50 microns of cylindrical precision was obtained for the roll (Ø580mm×5,765mmL) and there is not gap at central part.
  With this success we can obtain uniform wall thickness, it is expected that temperature unevenness is decreased at the time of cooling and heating, and equalization of the nip.

Advantage of Acid Sulfite Cooking as Processes of Bioethanol Production

Keishi Tanifuji, Shiho Takahashi a), Mikio Kajiyama and Hiroshi Ohi
Graduate School of Life and Environmental Sciences, University of Tsukuba
Current address; Department of Chemical Engineering, University of New Brunswick, Canada a)
Keiichi Nakamata
Technical and Development Division, Hokuetsu Kishu Paper Co., Ltd.

  From the standpoints of biorefinering processes, Japanese larch (Larix leptolepis) wood, acacia (Acacia mearnsii) wood, and bamboo (Phyllostachys pubescens) stem were cooked using the magnesium base/acid sulfite cooking method,and the dissolution behavior of carbohydrate in spent sulfite liquor (SSL) was studied. It was found that glucose dissolves rapidly into SSL immediately after sufficient removal of lignin from the pulp. Cellulose more rapidly dissolved as glucose into SSL at the later stage of cooking than at the initial stage. In addition, it was shown that larch mannan and acacia xylan dissolve as monosaccharides and oligosaccharides during the initial stage of cooking, and that both the hydrolysis of oligosaccharides and the decomposition of monosaccharides in SSL proceeded with increasing cooking time. The amount of enzyme adsorbed to residual lignin in enzyme-treated pulp was measured by pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS). Acid sulfite pulp (SP) enzyme-treated absorbed cellulase as 30-80 FPU on 1 g of lignin. It has a much lower value than soda-anthraquinone (AQ) pulp enzyme-treated.

Keywords: glucose, ethanol, cellulose, lignin