|2010 November JAPAN TAPPI JOURNAL
Vol.64, No.11 Abstracts
Web Inspection System for the Pulp and Paper Industry
Inspection System Division, Omron Corporation
An initial Web Inspection System, if it detects the defect, was the one only of simple information of it with the buzzer and the lamp, and marking to the defect location. Afterwards, defect information on the defect position, the size, and the classification name is added. It became a very usual function there was a defect recording system that Omron developed in 1989 now, too. Moreover, by transmitting inspection data to the next process like FCS (Fault Control System) and WCS (Winder Control System), it got to do the productivity improvement and the product management of the next process, too. Also, at present, it became possible by the improvement and the generalization of the PC and the network technology to handle a large-volume defect image, too. As a result, it is possible to say that the volume of information of the inspection data became big drastically and that the existence value, too, became bigger.
Operating Experience of Canvas Cleaner
Fuji Mill, Oji Paperboard Co., Ltd.
Oji Paperboard Fuji PM8 produces corrugating medium 440 tons per day. Recently papermaking conditions have been changed by using various recycled paper. These situation cause deposition troubles on the machine clothing such as the wire fabric, the press felt and the dryer canvas. Moreover deposits on the machine clothing induced defects on the paper which lead to large amount of re-finishing and loss. Most of defects were occurred at dry part, and we took some countermeasures, but we cannot solve them easily.
In this condition, we have introduced COMBI CLEANER from KGK for dryers in May 2006 based on reference at other mills. Then we have reduced the amount of re-finishing and loss by defect. COMBI CLEANER has shown high cleaning performance for the dryer canvas by super high pressurized water. This paper shows the background of introduction, operating experience and the effectiveness of COMBI CLEANER.
Operating Experience of Water Jet Turn-up System
Fuji Division, Oji Engineering Co., Ltd.
Oji Paper, Fuji Mill, N2 machine has produced white lined board since October 2001.
Although N2 machine used to use the tape turn-up system in the reeling process, it happened a trace problem pressed on the products because of the tape thickness (about 1.0mmt), which has become the main reason of spool loss at the turn-up process.
In order to modify the existing turn-up process more stably and to improve the production efficiency by reducing the spool loss at the reeling process, we installed a water jet turn-up system in N2 machine in April 2009. In this article, we report the outline of this modification, our operation experience and the improved result.
ValZone Metal Belt Calender
-The Extended Application from Coated Board to Uncoated Woodfree Paper Grade-
Metso Paper Japan Co., Ltd.
ValZone metal belt calendar, which was delivered to board machine market few years ago, has long calendering zone formed between a heated metal belt and a heated thermo roll. Metal belt calendering gives better surface topography and printability, because the extended dwell time gives efficient thermal energy transfer to plasticize the web surface, which enables symmetrical calendering with low nip load.
This article introduces new applications to coated fine paper and uncoated fine paper grades as well as board grades. This metal belt calendering performance can produce higher production efficiency with higher bulk or lower raw material cost and can help paper and board manufacturer in future.
Operating Experience of Retrofitting PM6 Reel with a Soft Drum
Sendai Mill, Chuetsu Pulp & Paper Co., Ltd.
The PM6 in Sendai Mill has been built up in 1986 for manufacturing wood free paper, and has been shifted to adapt all coated paper grades widely since 1994, mainly to adapt LWC paper. The PM6 has been manufactured LWC paper and A3 paper as its main product stably, without hard competitions.
The hard nip calender has been equipped at the PM6 from the beginning, however other latest on-machine coaters have equipped soft nip calender with elastic roll to adapt needs of high smoothness, high gloss, and high bulk nowadays. So, we have equipped the soft calender in May 2009, to make such high smoothness, high gloss, and high bulk products as on-machine finishing.
This report also refers to the soft drum at reel which has equipped for adapting wide range of quality grade of products, and refers to outline of those facilities and our operating experiences with them.
- Sirius Reeling Technology and Turn-up System -
Coating & Finishing Eng. Dept., Voith IHI Paper Technology Co., Ltd.
The paper processing is trending toward on-line processing, output expansion by high efficiency, and of course improved quality. For the reeling process to fulfill those requirements, the completely new reeling concept is required. This article starts to introduce mechanical structure and technology of Sirius reel. These practical experiences lead to reeling concept; Sirius. Latest turn-up system of reeling technology is represented.
New QCS Control Technology
-Energy Saving and Improvement of the Production-
P&W Solutions Dept., Yokogawa Electric Corporation
Today, carbon footprint reduction is one of the major issues to all the industries in the entire world. In Japan, pulp-and-paper industries have achieved 30% energy savings in past 30 years by the environmental conservation consulting, such as co-generation systems, high energy efficiency facilities and biomass boilers.
In paper making process, QCS has been installed to measure and control the paper quality, but with recent tendency of the society, its role has evolved rapidly into the direction of productivity improvement and energy savings. As a Japanese QCS supplier, Yokogawa has delivered the solutions to meet the requirements from the Japanese customers. In this paper, CD caliper and moisture controls are discussed and solutions are proposed to relief the concerns raised by many of the paper manufacturers.
Development of Dryer Section and Dryer Fabrics
Shikishima Canvas Co., Ltd.
We, Shikisima Canvas Co., Ltd., celebrated the 100th anniversary of the production of Dryer Fabrics in 2008.We have maintained our position of leadership in this business field in Japan since we produced the nation’s first Dryer Fabric in 1908 by fulfilling varieties of products, high quality products and technical services. Through that period, we’ve been coping with the technical innovations incorporated in modern paper-making machines, e.g. high-speed and wider width, so that we can satisfy customers’ requirements. Four large-scale high-speed paper-making machines have recently been installed in Japan, all of which are highly productive and enable the production of high quality coated paper. To respond to those machines, we’ve developed high-performance dryer fabrics taking advantage of the know-how on manufacturing and design technologies cultivated through our years of experience.
We, herewith, report the technological change on dryer section and dryer fabrics referring to the required performance of dryer fabrics and the actual status of use for the latest high-speed and wider width paper-making machines.
Comprehensive Study on Mechanism of Paper Strength Development by the Addition of a Cationic Polyacrylamide Dry Strength Resin
R&D Department, Paper Chemical Division, Arakawa Chemical Industries, Ltd.
Graduate School of Agriculture, Kyoto University
Graduate School of Agriculture, Kyoto University
In order to understand in detail mechanism of strength development by addition of a cationic polyacrylamide-based dry strength resin (PAM) at the internal application method, effects of PAM content and beating degree of fibers on the mechanical properties of papers made from bleached hardwood kraft pulp and further depth profile of PAM within a fiber wall were comprehensively investigated. The PAM retention in this study was quite high at lower addition levels under ca. 1% irrespective of beating degree, but decreased with decrease of beating degree at higher addition level. Measurements of an attenuated total reflection/Fourier transform infrared (ATR/FT-IR) combined with sputter etching and an electron spectroscopy for chemical analysis (ESCA) indicated that PAM tended to be distributed more inner side of fiber wall with increase in degree of beating. The retained PAM increased mechanically bonded area between fibers and further in some extent increased force holding capacity per bonded area for the papers from unbeaten and lightly beaten pulps. On the other hand for the papers from heavily beaten pulps, PAM addition caused a further increase of optical contact but no further increase of the mechanically bonded area. The increase in bonding strength per unit mechanically bonded area was a major cause of the strength development by PAM addition for the papers from lightly beaten pulps. The marginal effect of PAM addition on development of tensile strength for the papers from heavily beaten pulps should be related to the result that PAM content on and/or nearby the surface of fibers decreased with increase in beating degree. The increase in tearing strength by PAM addition for the papers from unbeaten and lightly beaten pulps would be derived from mainly an increase in bonding strength per unit mechanically bonded area rather than the increase of the bonded area. On the other hand, the retained PAM for the well-bonded papers from moderately and heavily beaten pulps gave constant tearing strength or a rather decrease in the strength, irrespective of the increase in bonded area probably due to stress concentration.
Keywords: Beating, Distribution, Dry strength resin, Handsheets, Mechanical properties, Polyacrylamide, Retention