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2011 November JAPAN TAPPI JOURNAL

Vol.65, No.11 Abstracts


Technology of Paperboard Making System for Resource-Saving
-Construction by in Total Wet End System and Coating Agent Prescription-

Kazushige Inaoka
Research & Development Department, Paper Chemicals Division, Harima Chemicals, Inc.

  Resource-saving which means basis weight reduction of paperboard is rapidly advanced. This trend makes internal additives less effective. Therefore, we tried to examine the technology based upon concepts to utilize the strength of fibers and give functions by surface chemicals.
  It was found that reducing alum dosage was good for strength, some demerits such as pitch trouble, poor drainage and retention could be offset by using coagulant and retention aids. This is gTotal wet end systemh we also suggested. Besides, application of coating agents was found to be effective for strength and sizing quality even in highly closed papermaking system and lightweight-trend of paperboard.
  Therefore, we could say that construction by the combination of total wet end system and coating agent prescription is quite effective technology to correspond to paperboard making for resource-saving.


The Influence on Bleaching Load by SAQ® as a Cooking Additive

Junji Tanaka
Kawasaki Kasei Chemicals Ltd.

  The influence on ECF bleaching load by SAQ® cooking is deliberated by the analysis of unbleached pulps. SAQ has been used as a cooking additive in many KP mills. By SAQ cooking, not only reduction of kappa number but also increase of brightness was observed in all the unbleached pulps. Furthermore, hexenuronic acid (HexA) content in unbleached pulp was not affected. Therefore, the ECF bleaching load can be reduced by SAQ cooking.


Modern Retention Technology for Higher Ash in Paper

David Lovell, Ross Howat and Shintaro Nakayama
Asia Pacific, Eka Chemicals

  Compozil is one of the well-known brand names for retention system in the paper making industry. Fine paper market is expected to grow to 150 mln tonnes from 90 mln tonnes by 2020 and this additional 60 mln tonnes will be produced on state of the art high speed machines, with machine speed between 1,800 mpm and 2,000 mpm and ash contents up to 30%. Eka Chemicals has developed new retention technology to achieve challenges of high filler. This new technology, Compozil Fx could be achieved up to 32% ash in paper.


PARETOTM Mixing Technology
-A Novel Mixing Technology for Water and Energy Saving-

Shintaro Sato
Paper Service Marketing, Asia Pacific, Nalco Company

  Sustainable activities and cost reduction are key business drivers for pulp and paper industry. NALCO developed PARETO technology in 2006, and this technology has achieved many success of water and energy saving and improving productivity.
  PARETO Optimizer is key part of this technology and it is designed by using CFD (Computational Fluid Dynamics) simulation. At the outlet of optimizer, the conical jet is discharged into process pipe and it makes complete mixing with process flow and chemicals. By using PARETO, water saving will be possible because process water can substitute for fresh water what is used for secondary dilution. And PARETO can save energy also, for example, improved polymer performance can help drainage, and steam consumption will be reduced on papermachine. And if mill use warm water for dilution water, using process water for dilution should eliminate energy of heating water.
  This technology is installed all over the world especially for feeding retention aid. Recently it has been expanded to pulping process and wastewater treatment. Since NALCO renewed PARETO technology last year, Ifd like to introduce it to Japanese pulp and paper industry.


Introduction of the Latest Saving Energy Technology
-ADC, MaxFlow, FINEBAR, GHC-

Keiji Yasuda
Technical Sales Department, AIKAWA IRON WORKS CO., LTD.

  Recently from the environmental stand point, the usage of Forest wood pulp and wastepaper pulp is increasing. Forest wood pulp is short fiber, and many main materials are LBKP. It is an important issue to get paper strength without useless fiber cutting by the refining process. And the second important issue to be achieved is power saving. With the latest LBKP refining data, we would report the features of each ADC Double Conical Refiner/VS Double Disc Refiner and FINEBARTM VS casting plate.
  The increase in wastepaper usage also made the power saving in the screen process of stock preparation more important. We also report our latest developed energy saving Screen rotor, gGHCTM Rotorh and NW1 basket with larger open area.


Thermal Conductivity of Paper Coatings: Role of Latex Binder

Patrick A. C. Gane
Omya Development AG
Philip Gerstner
Department of Forest Products Technology, Aalto University

  Thermal conductivity of pigmented coatings has been shown to be related to the connectivity and material placement within the coating structure. In the case of calcium carbonate and latex binder, as studied here, the colloidal interactions determine the relative positioning of binder and pigment in the wet state, i.e. the actions of segregation and agglomeration, mostly in the form of depletion flocculation, in which, at a critical latex dose, the packing of the pigment becomes disrupted. The consolidation of the structure during drying reveals that latex binder initially centres itself between the pigment particles at their contact nodes. Conductivity of the calcium carbonate pigmented structure is determined by the packing density, and connectivity provided by the dispersant polymer (polyacrylate). In the case of low Tg, latex becomes deformed and extruded, such that it acts as a fine pore generator, such that the conductive path becomes more tortuous. Latex with medium Tg deforms less to provide the local connectivity at the node points only, and so contributes at low doses maximally to thermal conduction. At higher dose, the insulating property of latex dominates. High Tg latex behaves as a hard sphere, has little to no contact area, and becomes excluded from the inter-pigment contact nodes, such that the thermal conductivity is relatively high due to the close packed structure.


Thermal Spray Technology for Carbon Roller and Applications for Paper Mills

Masaya Nagai and Sadato Shigemura
Tocalo Co., Ltd.
Akihiko Yoshiya
Mitsubishi Plastics, Inc.
Masanobu Yamanaka
Sunray Co., Ltd.

Carbon Fiber Reinforced Plastics roller (CFRP roller) is called carbon roller. Carbon roller exhibiting excellent characteristics including lightweight, high-stiffness, and low-flexure has been increasingly employed in manufacturing industrial fields. Compared to conventional metal rollers, carbon roller is lighter and stiffer, and exhibits lower inertia moment. Generally, carbon rollers are rarely used without surface coating due to the lack of wear resistance and gripping properties with paper web and plastic film sheet. The authors have invented a coating technique using various materials on carbon rollers after years of research and development.
This paper describes thermal spray technology for carbon rollers and application for paper mills.


Curtain Coating for Printing and Board Paper
-Its New Approach and Prospect-

Toshihiro Katano
Voith IHI Paper Technology Co., Ltd.

  Curtain coating has been applied particularly to specialty paper, namely thermal paper, non carbon paper, information paper and so on. Nowadays, for further utilization of DF coater, Voith IHI has been developing it from two aspect; color and machinery. For example, until recently, it was the main stream to replace an air knife or a rod coater by a DF coater for specialty paper. However, now, Voith IHI is aiming to install a DF coater as an alternative to a blade coater for pigment coating. Referring to this movement, this thesis will introduce an approach to the new area of DF coated paper and board paper and its prospects.


Improved Productivity and Reduce Rejects with 2D On-Line Formation Analyzer

Yan Luo
Techpap SAS

  A well controlled sheet formation is necessary to warrant optimal physical characteristics and sheet quality. To evaluate sheet formation, the paper maker must have visual control in addition to sheet formation information such as floc size and distribution, overall LT (Look Through), floc anisotropy, periodic marks and trends. Centre Technique Du Papier and Techpap have developed a new 2 dimensional on-line formation sensor based on present video analysis technology. The first Techpap Formation system was installed in the mid 90fs with many installations made in markets throughout the world since.


Case Study of Optical Caliper Sensor

Noriyuki Kobayashi
Ishinomaki Mill, Nippon Paper Industries Co., Ltd.

  For those who involved in QCS (Quality Control System) measure paper quality online, measuring the thickness of the web by using caliper sensor had been difficult issue for a long time. Traditionally, critical caliper measurement has been achieved through the use of dual-sided, contacting caliper sensors. This sensor sometimes requires very delicate tuning of contacting pressure or mechanical alignment, and the some result of them did not satisfy us. Therefore, recently paper makers have been asking for a new type of caliper measurement, which overcomes the weaknesses of contacting caliper. On that occasion, Yokogawa, one of the QCS makers released optical caliper sensor. The measurement is based on a combination of two techniques chromatic aberration and confocal displacement and adopt unique non-contacting (one side light-touch) design less caliper-related defects than existing one.
  This report presents the outline and the results of introducing optical caliper sensor which we introduced into Ishinomaki mill N6.


The Innovative Dryer Cylinder Drive and Lubrication System for Gearbox
-Speed Up Your Machine with the Assistance of AS Drive and Lubrication Solutions-

Tomoaki Takahashi
MATSUBO Corporation

  A large number of paper machines have reached the end of their economical life due to old and redundant drive assembly designs. With an ever increasing demand in terms of production speed and quality, the bottle neck could be traced to the dryer section drive assembly. Normally this requires a complete rethink of drive layout, forcing new solutions for modern problems. Very often, an increase in noise levels, oil leaks and paper web flapping will provide the first signs for a need to take action. This article will provide an overview of the innovative solutions by means of effective silence gearbox system FlexoGear® and peripheral equipments including lubrication unit Lubriflex® and intelligent oil flow meter FlexoFlow® produced by AS Drives & Services GmbH, Raken Germany.


Scientific, Technical and Financial Challenges of Achieving a Biofuels Industry

Richard B. Phillips
North Carolina State University

  Despite many years of intensive research and development, biofuels are commercially produced today almost exactly the same way as 20 years ago. Biofuel production technology developments in progress include three broad categories: purely biochemical, purely thermomechanical, and hybrid technologies that incorporated elements of both. None has achieved commercial success thus far. We discussed four areas where science is needed to make a breakthrough:
  1. Better integration of land and bio-energy plantation economics to provide abundant, affordable biomass feedstock.
  2. Bioengineering improvement of biomass feedstock to increase carbohydrate (biomass) or lignin (thermo-chemical) content.
  3. Other bioengineering improvement to reduce the recalcitrant of biomass through the various steps required to achieve product yields.
  4. Simpler process design that achieve capital efficiency.
  Our Research Team at North Carolina State University has developed a foundation to simulate - both technically and financially - integrated biomass - to - biofuels conversion technology options and have indentified promising alternatives incorporating current and projected advances in each area of the chain.

Keywords: biomass, enzymes, biochemical, thermomechanical, economics


A Rreport on ISWFPC 2011
-June 8-10, 2011 at Tianjin, China-

Tomoya Yokoyama
The University of Tokyo

  ISWFPC 2011 (The 16th International Symposium on Wood, Fiber, and Pulping Chemistry) was held in Tianjin, China on June 8-10, 2011 hosted by CTAPI (China Technical Association of Paper Industry). Total participants were 410 people, and 138 oral presentations including 4 plenary lectures on 11 specific fields were conducted with 156 poster presentations. Summaries of several presentations were described.


TAPPI PaperCon 2011 Conference and Exhibit Participation Report

Takao Ochiai
Nippon Paper Industries Co., Ltd.

  Nippon Paper Group is aggressively expanding business ventures in foreign markets in an effort to achieve 30% of the Groupfs total sales from businesses abroad, in line with its gGroup Vision 2015h. To achieve this goal, one of the key elements that our Group is focusing on is nurturing of company personnel who will be able to perform equally as effective in our overseas business ventures as in Japan. To this end, we have implemented various programs.
  As Nippon Paper Group goes forward with this goal, the need for young engineers experienced domestically in the management of various areas of pulp and paper plants operations including quality control and engineering who are able to apply these skills and knowhow to the overseas plants is critical. Nippon Paper Group has developed a global program for engineers called gTechnical Training Course for Employees Transferred Abroadh. This program sends employees to an existing Group plant located abroad, and immerses them in the education of the spoken foreign language as well as exposing them to the various cultures, business practices and plant operations. The goal is for employees to learn quickly and acquire the skills necessary to perform effectively in the international business arena.
  As part of this program, in March, 2010, I was sent to North Pacific Paper Corporation (gNORPACh) which is one of our major affiliates in North America, to study and train for a year and a half. The program allowed me to attend a TAPPI pulp and paper conference called gTAPPI PaperCon 2011 Conference and Exhibith in Covington, KY. The conference was held from May 1-4, 2011.
  In this paper I am about to present, I will first introduce the mill I was assigned to, the NORPAC mill. Later, I will report on the conference itself. Let me just explain to you that I am unable to give a comprehensive report on the conference itself as I was the lone participant from Nippon Paper Group or from other Japanese paper mills. Therefore the sessions I was able to attend were limited.


Growth of Young Short-Necked Clam in the Artificial Tidal Flat created by using Solidification/Stabilization Techniques with Paper Sludge Ash-based Coagulants

Daizo Imai, Satoshi Kaneco, Kiyoyuki Egusa, Hideyuki Katsumata and Kiyohisa Ohta
Department of Chemistry for Materials, Graduate School of Engineering, Mie University
Tohru Suzuki

Environmental Preservation Center, Mie University
Ahmed H. A. Dabwan
Faculty of Chemical Engineering Technology, Tati University College

  Paper sludge (PS), which is mainly made from paper factories waste can be utilized for useful applications. We have developed an in situ solidification system for treatment of sea bottom sediments, the gHi-Biah-System (HBS)h, by using incinerating PS coagulant. The solidified material produced by HBS has applied for restoration of the marine environment ecosystem (i.e. Tidal flat, Seaweed and seagrass bed, etc.). The number of benthos individuals in the constructed artificial tidal flat has been shown to be similar to those observed in a natural tidal flat. In this report, we showed the monitoring data of the growth of young short-necked clams (Ruditapes philippinarum) in the artificial tidal flat. The remarkably large growth was observed in the artificial tidal flat rather than natural tidal flat. We believe that these solidified materials were useful for restoring marine ecosystem.