2004年11月 紙パ技協誌



November 2004    Abstracts

Increasing Productivity by Investing New Technology PartU
−On Machine Calendering for on Machine Coater−

Takashi Akazawa
Metso-SHI Co., Ltd.

 There are references in operation for the production of film-coated LWC HSWO grades, but rotogravure print quality has so far been considered almost impossible to reach with the film technique due to the high smoothness requirements, especially at basis weights below 57 g/m2.
 As opposed to conventional solutions, the focus is placed on improving base sheet uniformity further (i.e. low basis weight variation and evensidedness) by closing and smoothening the paper surfaces with reinforced precalendering prior to film coating, which is then followed by multinip calendering to produce the desired final surface properties.
 The all-online surface treatment process consists of reinforced precalendering, a compact coating process, and multinip final calendering. To reach the quality requirements placed on both LWC rotogravure and HSWO printing paper produced with film coating.

Solution for Dryer-part Deposit Oriented Spot Prevention in P&W Grades

Hitoshi Karakuni
Maintech Co., Ltd., Sales Engineering Dev.

 Spot problems originate from deposition of pitch, stickies and latex in the dryer section is becoming a critical problem under high DIP furnish, closed system and alkalization conditions. These spots lead to production and quality problems such as an increase of broke and joint work. To date, only a few pitch control programs have been tried, high-pressure fabric (canvas) cleaning showers and double doctoring have been developed. However none of them have met with industry-wide acceptance.
  Maintech has developed a spot prevention program, a total solution that passivates all surfaces in the dryer section where the deposition could increase spots. The program starts with M/C survey and interview to M/C tender to investigate the spot generation process, then present a proposal which installs equipment in the proper positions, uses the correct chemical where needed. The resulting surface passivation prevents depositions on cylinder, fabric and calendar rolls and drastically reduces the number ofspots on paper. Mills can take considerable advantage of this program. Elimination of deposits in the dryer section reduces not only the number of joints in the finished rolls but also reduced tonnage and down time for M/C cleaning. This paper reviews an investigative method of spot generation from dryer deposition. Case histories illustrating gained benefits in printing grade M/C are presented.

Resource Saving and Energy Saving of Paper Machine
- “Petax” for White Water Recycling Shower and “Robo Cleaner” for Canvas Cleaning -

Kazuo Aoshima
Technical & Engineering Dept., Aikawa Iron Works Co., Ltd.

 Various approaches to resource saving and energy saving have been taken in papermaking industry. I will introduce hereunder the new equipments contributes to solve problems in paper industry, specially the issues in paper machine. One is “Petax” enables the recycling of white water and another is canvas cleaning unit, “Robo Cleaner”.
 Petax is the filter capable of filtrating white water to the quality needed to high- pressure shower. Recently high-pressure paper machine cleaning shower uses large quantity of flesh water with speeding up of papermaking speed or enlargement of machine capacity, etc. But the water is limited resource and the recycling is an important issue.
 For waste paper, further promotion of utilization is emphasizing. Along with the increase of quantity consumed of waste paper, the stock preparation unit is improved year by year to meet these requirements. On the other hand, in papermaking process, it is said that troubles caused by rise of utilization of wastepaper are increased. Contaminants such as paper powder and pitches attached in wire (former part), felt (press part) and canvas (drier part) are part of the reason for these troubles. The units used to remove these contaminants are ROBO Cleaner.

Yield Estimation for COMPACT COOKINGTM and KOBUDOMARI Pulps

Catrin Gustavsson R&D Kvaerner Pulping AB Ju Yan
Projects Department Kvaerner Pulping KK

 A method for determining the mill-cooking yield has been developed. A laboratory cook performed at the same temperature, hydroxide ion and hydrogen sulphide ion concentration as in the mill is used to obtain the reference data needed for the calculation of the mill yield. The assumption made is that at constant kappa number the cellulose   content in mill and laboratory pulp is same. Since the gravimetrical yield of laboratory cooked pulp can be determined with ease, the mill yield can be calculated.
This method has been a useful tool when evaluating the yield increase when implementing COMPACT COOKINGTM or KOBUDOMARI into the mill. It was observed that COMPACT COOKINGTM and KOBUDOMARI gave a yield increase of about 1% compared to conventional cooking when calculating the mill yield using this method.

Development and Current Situation of Waste Treatment and Recycling Equipment

Yukio Tajiri TAJIRI Corporation

 We suggest our customers with most appropriate recycling system from our wide variety of recycling systems available to prevent global warming and optimization in recycling process of natural resources.
  We also are currently developing ecofriendly and energy saving recycling systems such as reconvastion of RPF/RDF, reutilization of wastes as chemical products.

Develop the Canvas Clean Roll - Canvas Cleaning Device -

Toshio Kameyama
Aoki Machinery Ltd.

 Under the circumstances of environmental pollution problems to be being
strictly restricted in world widely, the demand of recycle paper has been increased drastically in its volume as for paper production materials.
 As proportionally as its usage of recycled paper has been increased, there are new problems in topic caused by latex-glue (so called Pitch) from them. Problem is that they are easy to stick to the fabrics in the operation and finally reduce total operation ratio by causing a lot of troubles to keep clean paper production.
 In order to protect these problems, several newly introduced methods have been applied, such as @replace with finer screen to be more in effective in the process of preparation, A newly application of chemical for releasing latex-glue for less sticking, Bnewly installation of washing method for Canvas cleaning, Cspraying chemical onto surface of Canvas for protection its stein and Dmechanically make free some rolls from touching to the surface of fabrics for protection of pitch(latex-glue) accumulation.
 Here with, please find the newly development “Washing Method” based on the same technology of “Shower Roll” already introduced into the market. This is the firstly innovated “Canvas Cleaning Roll” in the world as an extent of the technology of “Shower Roll” plus with additional patented design to be more effectively working as a Washing Method for Canvas in the paper machine.

Steam Turbine-Induction Motor, Dual Driven Air Compressor

Yasuo Fukushima Nishinihon Machinery Department Shinsho Corporation

 Energy saving method by converting the difference of steam pressure to otive power with steam turbine instead of using pressure reducing valve promotes high efficiency, and introduction of such method has been increase in recent years.
 Besides building a new plant from the beginning, it is a key to decide for what application the collected motive power at the existing plant is utilized.
 How to use the steam turbine as auxiliary motive power to compressors, which has high energy consumption rate, in general plant are hereunder described.

Global Neutral/Alkaline Papermaking Overview -ASA sizes are highlighted-

Dominic S. Renda
Principal Consultant, Advanced Technologies, Paper Services Division, Ondeo Nalco Company
Yukio Kase
District Manager, ONDEO Nalco Japan Co., Ltd.

 Neutral/alkaline papermaking continues to develop and dominate many paper and paperboard market in the Americas and Europe. These global experiences can provide the foundation for neutral/alkaline papermaking practices in the Asia-Pacific markets. Significant advances in functional and process aid chemicals and their application technologies have supported this trend. Commercial neutral/alkaline papermaking conversions using alkenyl succinic anhydride sizes (ASA) are highlighted.

A New Low Consistency Refiner Improved Fiber Properties While Reducing Idle Energy by up to 40% - Andritz Papillon Refiner -

Gabl Helmuth and Gorton-Hulgerth A.Andritz AG Yosuke Takeshita Andritz KK

 Andritz AG has developed a new machine Papillon, which combines the advantage of the cylindrical refining zone of the Hollander beater with the modern design requirements of continuous operation in small machine. It provides significant in fiber technology and reduction in no load energy.

The Development of the New Insect Control Program

Mitsuru Sakai
Research & Development Div. Earth Environmental Service Co., Ltd.

 The various measures have been taken since before in a factory as the prevention of the breeding and extermination of the insect. However, there are few cases that developed the program of effective prevention of the breeding and extermination. The factory where has the program that be able to explain to the outside a company is few. The cause is various, the structure of a factory, insect of knowledge insufficient, maintenance, analysis, communication, engagement person, and it is those complex. There can be more than one cause.
 The procedure of the insect control program development is similar as crisis management program development. Even the knowledge of the specialist of the academics is necessary to the plan of the measure. As for the enforcement of the improvement activity the plan is important. The plan of the plan including the role share of the engagement person is important and to implement certainly. The communication that included education was effective. The periodic validation of plan itself is necessary. Each of insect control measure has an effect and limit that originate from each characteristic. The combination of several measures is effective. The development of the insect control program, that has explain to the outside a company, is demanded.

Polyvinylalcohol Applied for The Ink Jet Silica Binder
- Application of Crosslinkable PVA “Gohsefimer Z” -

Shusaku Mandai and Yoshiaki Hirai
Central Research Laboratory, Gohsenol Laboratory,
Nippon Synthetic Chemical Industry Co., Ltd.

 Application of Gohsefimer Z (acetoacetyl group modified PVA) as silica pigment binder for the porous-type absorption layer of IJ media was investigated. Applied with proper cross-linking agents, Gohsefimer Z exhibited excellent silica-binding strength, which can prevent silica dusting even when small amount of PVA was used.
 For example, the coating layer of IJ media combined of Gohsefimer Z and Zirconium compound or Adipic dihydrazide (ADH) showed larger silica binding strength than that of other PVA. Moreover the viscosity of the coating mixture consisted of Gohsefimer Z and Zirconium compound or ADH did not show abrupt increase. These results suggests that Gohsefimer Z based systems are promising as the binder for the porous type IJ media.

The “Chlorine Dioxide Concept” - A New Way of Supplying ClO2 for Your Bleaching Demand -

Anders Dahl Eka Chemicals AB Muneo Sakamoto Nissan-Eka Chemicals Co., Ltd.

 Eka Chemicals, the world’s largest maker of chlorate has introduced a new way of supplying chemicals and process know-how to its customers in the pulp industry, the “Chlorine Dioxide Concept”. This concept adds value to our customers and they can focus on their core business, making pulp. Highly efficient processes like SVP-LITETM, SVP-HPTM, and HP-ATM and remote monitoring guarantees stable, cost effective and safe supply of chlorine dioxide.

Reports of Pulpaper 2004 Conferences

Yasuto Tanaka
Technology Div. of OJI PAPER CO., LTD.
Makoto Iwasaki, Yosuke Uchida
Pulp & Paper Research Laboratory of OJI PAPER CO., LTD.

 Pulpaper 2004 was held in Helsinki, Finland during June 1-3 in 2004. Pulpaper attracted about 20,000 visitors on a scale similar to SPCI in north Europe. The technical sessions presented 48 oral reports and 26 posters under the themes of energy and Carbon management, coating, and Efficiency.

The movement of the environment regulations and Green Procurement Survey Standardizing Efforts
- In Canon Inc. -

Kiyoto Furuta
Environment Management and Engineering Center, Global Environment Promotion Headquarters, Canon Inc.

 Laws and regulations concerning environment are getting stricter and stricter these days all over the world. What the IT equipment manufacturers have to pay attention to, in particular, is the use of chemical substances contained in parts and materials in order to comply with related laws and regulations.
 From 2001, Japanese electrical and electronic equipment manufacturers have been discussing standardization of green procurement survey in order to make own products more environmentally conscious ones. Electrical and electronic industries of U.S. and Europe also agreed on the concept of standardization and the three parties are now moving toward the global standards of green procurement survey. Green procurement surveys of parts and materials are essential for legal compliance of products and for selecting parts with low environmental burden. Sharing such information among manufacturers greatly improves efficiency for product development, and it is also advantageous for suppliers because it helps constructing database efficiently. This paper describes the activities toward the global standardization.

Correspondence to Waste Illegal Dumping (Insight into Wicked Dealers)
- Structual Factors and Counter Measures of Illegal Dumping and The Recycling Outlaw -

Masayoshi Ishiwata Chiba Prefecture, Environment and Life Division, Industrial Waste Dept.

 The actual condition of the waste illegal dumping is explained from the viewpoint of the dual structure of industrial waste treatment, the illegal dumping syndicate, the formation of an illegal dumping center of savings storage, the overflow of a middle processing institution, the raising funds of the last disposal place and the industrial waste connection evolved type .
 In addition to thous, the actual condition of the recycling is explained of the problem of container packing recycling, 6-fold price of plastics, the household- electric-appliances outlaw, and the automobile recycling law. And the correspondence to these is explained as “the illegal dumping zero program (3x3 methods)” of administration.
  Furthermore, the evaluation of the potential risks on the industrial waste treatment, the risky industrial waste disposal contractor, the input-output analyzing method and the simple risk-assessment-method are explained.

Effect of Notches on Micro Failures During Tensile Straining of Paper

Tatsuo Yamauchi
Graduate School of Agriculture, Kyoto University

 Acoustic emission that occurred during the tensile straining of handsheets made from softwood or hardwood kraft pulp beaten to various degrees was measured and analysed to investigate the effect of notch application and notch geometry on micro failures occurred during the tensile deforming and fracturing. Notch application causes a higher proportion of failure of fairly strong fiber bonds and fiber failure throughout almost all of the tensile straining period irrespective of notch geometry. Furthermore, an increase in beating degree causes a higher proportion of failure of fairly strong fiber bonds and fiber failure for both specimen with and without notch. Notch geometry little affects on the micro failure occurrence mentioned above, while maximum tensile load per width and the period required for sheet breaking after maximum load are affected by notch geometry.

Keywords: Acoustic emission, bond failure, fiber failure, notch, handsheets, tensile testing, Infrared thermography