|2011 February JAPAN TAPPI JOURNAL
Vol.65, No.2 Abstracts
Introduction of Total Tail Handling System for Paper Machine
-From Wet End to Reel-
Paper Machinery Engineering Dept., Kobayashi Engineering Works, Ltd.
Tail threading systems and equipment has been developed over the years to be able to automatically thread the tail wherever an open draw occurred from one section to the next section of the machine. Some sixty years ago the rope threading system was introduced to thread the dryer section, calendar and reel. Approximately forty years ago the vacuum belt was introduced for threading systems at the dry end. The airfoil application was developed by Crown Zellerbach thirty some years ago.
Total tail handling system introduced this time, is the result of combination of process know-how, and manufacturing expertise obtained from our long experience in Japanese pulp and paper industry, and those of Paperchine, who is a technical licensor in USA, succeed to and developed in the technology of former Beloit Corporation. This combination has succeeded in the epoch making improvement of tail handling system for whole parts of paper machine.
Basic Concept of Drainage System and Possibility of Energy Reduction
Motoyama Shinkoh Co., Ltd.
Recently a dry part has been put into improved enclosed hoods, air supply/exhaust, and heat recovery systems, and has remarkably increased efficiency. There is a close relationship in drying wet paper between drainage systems and hood ventilation systems that the drainage system must meet. Although the basic concept of the drainage system remains unchanged, the condition plays a key role in the quality and energy cost for drainage systems. In order to have maximum drying and hold it, it is indispensable to understand the exact condition of the drainage system following a change in a good and stable condition, which may lead to reducing energy costs. We report it with “Basic Concept and the Possibility of Energy Saving”.
Operating Experience of PM N1
Tomioka Mill, Oji Paper Co., Ltd.
PM N1 in Tomioka mill started the trial operation from November 2008 and has produced commercial paper since February 2009. We successfully achieved the continuous operation at 1,650mpm and the production of 1,050t/day in last December. At present, we work on the problem extraction and cope for the continuous operation at 1,700mpm.
This report presents the outline of facilities, operation troubles we have experienced since commercial production started and the countermeasures at the dry section of PM N1.
Operating Experience of PM N6
-Dryer to Reel-
Ishinomaki Mill, Nippon Paper Industries Co., Ltd.
Commencing commercial production on Nov. 1st 2007, Ishinomaki PM N6 has mainly produced LWC and MWC at 1,600mpm since its smooth startup. With width of 9,450mm wet fabric, 1,600mpm operating speed and 1,005t/d capacity, the PM N6 is one of the NPI's largest PMs. Besides its large scale and capacity, the PM N6 has also equipped with both on-machine blade coater and on-machine calender. Furthermore, focusing on competitive cost performance as well as top class productivity, the PM N6 has installed numbers of leading technology to improve its operating efficiency.
This report has introduced the outline of PM N6’s latest equipment and summarized our recent operating experiences in the dry section of PM N6.
Operating Experience of Niigata N9
Technical and Development Div., Hokuetsu Kishu Paper Co., Ltd.
Niigata N9 has started commercial production since September 1, 2008 as the 4th on-line coater paper machine in Hokuetsu Kishu Paper. N9 which has a higher productivity concept by its high speed and wide paper width has increased smoothly the production and speed thanks to our on-line coater technology from N6, N7 and N8, on-line calendar for A3 gloss, gap former, tandem shoe press, sizer and tail threading equipment for steady tail threading with high speed.
N9 has reached 1,600m/min as a maximum speed now, and tried various challenge for high speed to aim for more stable operation. One of the most important things to achieve high efficiency is a steady tail threading at high speed, and we’ve improved tail threading one after the other. This paper reports operating experiences of form the dryer section to the reel and spotlights tail threading and turn up device form dryer section.
Light Weight Containerboard Machine with Metso Technology
-Towards Lower Basis Weights-
Project & Engineering, Paper Business Line, Metso Paper Japan Co., Ltd.
The trend towards lower basis weights presents a set of challenges for production. First, the economical production of lighter weight grades requires higher machine speeds. Second, producing board from lower grade recycled furnish often causes quality problems, and, finally, the end product still needs be strong.
Over the past twenty years fluting and linerboard basis weights have decreased significantly (Figure 1). To compensate for this, it has been necessary to increase machine speeds proportionately. This is already evident in the higher design speeds of new installations.
While basis weights have decreased, the use of recycled fiber as the furnish for containerboard has increased. Economic pressures require cost reductions, which has led to the use of mixed waste instead of high quality OCC. This, in turn, has increased the ash content of the furnish (Figure 2).
The increase in ash content is often compensated by the use of a film size press. As is well known, ash does not make hydrogen bonds and thus does not contribute to strength. With furnish of strong fiber, a film size press is naturally not needed. Furnish made using mixed waste often comes with a high ash content, and so a film size press is necessary. This paper describes the outline of Metso new concept for fluting and linerboard.
Improving the Efficiency of the Process of Making Paperboard with Paper Additives
Kenji Sakai, Naho Murata, Hiroyuki Koshio and Shohei Mitsui
Syonan Research Center, HYMO Corporation
For the purpose of improving the efficiency of making paperboard, it is effective to improve water drainage by means of making suitable flocculation using drainage aids. However, normal linear polymer having high molecular weight often causes too large flocculation. It causes not only bad formation but also inefficiency at the press and dryer part and deterioration of paper properties.
In order to improve such problems, we have developed Himoloc FR-740 and new drainage aids (FR-type and DR-type) using our original synthesizing method without controlling molecular weight simply.
FR-type is multi-compound polymers, having very wide range of molecular weight and charge density. Therefore, FR-type includes both high molecular weight polymer having flocculation ability and low molecular weight polymer having coagulation ability. When FR-type drainage aids are used, floc is formed uniformly and not too large. So, FR-740 can improve water drainage without having a bad influence on other property and efficiency.
In order to cope with various conditions of the paperboard, we also have developed new DR-type drainage aids. Their flocculation force is designed to be more than FR-740 and less than normal retention aids. Because of introducing intramolecular interaction, new DR-type drainage aids have different characterization from normal linear polymers having high molecular weight. We expect high ability of water drainage without a bad influence on formation and paper strength in spite of increasing flocculation ability.
In this report, we show the performances of these drainage aids.
Carbon Roller Design for High-speed, Wide-face Paper Machines and Reduction Technique of the Dynamic Runout
Mitsubishi Plastics, Inc.
Masaya Nagai and Sadato Shigemura
Tocalo Co., Ltd.
Sunray Co., Ltd.
Rollers, which are composed mainly of carbon fiber reinforced plastics (CFRP), are called “Carbon rollers”. Carbon rollers have great advantages over metal rollers, such as light weight, low inertia, less deflection, and high natural frequency. Today, carbon rollers have been intergraded into industrial machinery such as film and, paper making, and printing presses. When carbon rollers are used in paper making machines, the rollers are required to keep stable rotation at ultrahigh-speed even though the roller face is very wide. To achieve the performance, the highest level of dynamic balancing of roller is required. A unique balancing technique introduced in this paper enables to exercise the best roller performance.
Analysis of Distributions of the Paper Chemicals on Paper (III)
-Visualization Analysis of Distributions of Amphoteric Strengthening Agent onto Pulp Fibers-
Fumiaki Inokuchi and Tadashi Sawahata
Research and Development Center, Development Management Division, Arakawa Chemical Industries, Ltd.
Research and Development Center, Paper Chemicals Division, Arakawa Chemical Industries, Ltd.
It is supposed that amphoteric strengthening agent (polyacrylamide series) could be aggregated under specific conditions (pH and conductivity) to form polyion complex (PIC). However, the condition of PIC in the solution has not been clear in the past. In this study, the form of PIC and the fixation process to pulp fiber in the solution have been clearly visualized as a result of observation under a phase-contrast microscope. Moreover, we describe the distribution state of PIC onto pulp fibers in the solution along with the results of the analysis under a scanning probe microscope (SPM) and a Raman microscope.
Magnetic Ion Exchange Resin Technology: Removal of Color, DOC (Dissolved Organic Carbon)
Itochu Machine-Technos Corp.
Maezawa Industries, Inc.
Magnetic Ion Exchange Resin System (MIEX® system) is able to remove color and dissolved organic carbon (DOC) by anion exchange process in industrial water and wastewater.
The purpose of this investigation is to evaluate applicability of MIEX® system for pulp and paper wastewater by MIEX® fundamental experiment.
As a result of this experiment, it was shown that this system is able to remove color, DOC and COD (chemical oxygen demand) effectively regardless of the concentration of organic matter discovered that and the more concentration of this resin increases, the more the removal rate improves. Therefore it was cleared that this system can be applied for wastewater from paper mill effectively as reuse of the wastewater or reduction of COD and color in wastewater.
Further, this paper introduces about commercial plant of Australian paper mill.
Preparation of nano sized TiO2 from Paper Sludge Ash
Ehime Institute of Industrial Technology
Naoto Matsue and Teruo Henmi
Faculty of Agriculture, Ehime University
Some of paper sludge ash (PS ash) contains TiO2 which is used for pigment. This TiO2 has 100〜300nm of particle size and shows any little photocatalytic activity. PS ash containing nano sized TiO2 was obtained by three kinds of acid treatment (HCl, HNO3, H2SO4) after alkali hydrothermal reaction of PS ash. XRD analysis and SEM observation showed that crystal structure of TiO2 included in PS ash was anatase type and crystal size was 10-14 nm. BET surface area of PS ash containing nano sized TiO2 was 258-288 m2/g. Gaseous acetaldehyde removal experiment was carried out to evaluate photocatalytic activity of nano sized TiO2 in the PS ash. Nano sized TiO2 obtained by H2SO4 treatment have ability of decomposing acetaldehyde to carbon dioxide under UV irradiation, while untreated PS ash was able to decompose acetaldehyde any little.
Keywords: PS ash, nano sized TiO2, photocatalyst, acetaldehyde