2006年2月 紙パ技協誌


Solutions for Deposit on Pre-Drying Part Producing Fine Paper at Kure Mill

Yoshihiko Hirata
Kure Mill, Oji Paper Co., Ltd.

 No.5 Paper machine at Kure Mill, which has started operation as a fine paper machine in 1989,also now produces LWC paper in response to the market demands. Major trouble on Producing Fine paper comes from Spots. Spots originate from DIP for LWC.
 This introduces Solutions for the Dirt from Pre-Drying Part

Recent Trend of Paper Chemicals for Surface Treatment
- Surface Sizing Agent Polymaron-E100 Series -

Tsuyoshi Haraguchi
Paper Chemicals Division, Arakawa Chemical Industries, Ltd.

 Recently, the paper manufacturing companies in Japan have been increasing waste paper stock usage as a result of taking the environment and resources-preservation issues into consideration. Besides, the operation of paper machines and coaters at higher speed in order to reduce the production cost leads to the harder situation for the paper chemicals to show their efficiency. In fact, the retention of internal sizing agents and the effectiveness of surface sizing agents tend to decrease.
 Under the circumstances, it is strongly noticed to make paper with higher qualities and wider versatilities using surface agents that can improve the surface quality of paper. At this time, we shall present our surface sizing agents, POLYMARON E-100 series, together with the latest technical tendency of the agents.
 POLYMARON E-100 series show higher sizing effect compared with conventional surface sizing agents. Particularly when coated on neutralized papers, they show excellent sizing effect, writing quality and ink-jet printability. Moreover, they have excellent mechanical stability and less foaming property which is good for operation.

Trend of Shoe Calender
- Application for Bulky Sheet -

Setsuo Suzuki
Hiroshima R&D Center, Mitsubishi Heavy Industries, Ltd.

 Recently better surface for high quality printing and bulky paper for saving pulp consumption are required in our market. Shoe Calender is applied for paper and paperboard to make bulky sheet. Long nip dwell time and low nip pressure are key factors to make bulky sheet. Uniform smoothness, high stiffness and better printability are further benefits of shoe calender.
 MJ calender is applied the technology from shoe press, and meets above requirement. This paper introduces outline of MJ calender and shows data from the pilot trial and field.

Non Contacting Caliper Measurements (Laser Caliper Sensor)

Nakano, Reijiro
Sales Development Dept., Honeywell K.K.

 Direct thickness measurements (also called “caliper” sensors) provide an actual thickness measurement of paper web. There are two methods used to provide this. The first is to measure the distance between two product contacting sensing “elements”. The other is to assume the distance between two sensor heads is fixed and to measure the distance to each head from a product to their support. Of the two methods the first will typically provide the highest degree of accuracy and repeatability but needs to either physically touch the material to keep the sensing element at a fixed standoff distance. The contacting sensor sometimes causes the marking, damage and dirt spike problems to products especially for lightweight papers on high-speed machines and supercalender applications. Also the contacting head of Caliper sensor itself has abrasion and dirt build-up problems as a maintenance issue.
 So the second method has been developed for a long time, but non contacting methods typically have accuracy problems as a scanning on-line sensor because of the assumed fixed head separation. Honeywell has solved this issue by physically compensating the separation in the two sensing heads and introduced the Non Contacting Laser Caliper. The method for looking at the distance of each sensing head to the sheet and assuming a fixed distance between the two sensing heads is using laser triangulation and Z sensors. This paper presents the new developed Honeywell NC Laser Caliper.

Optimization with Updating PM4 Paper Quality Measurement and Control System at Sendai Mill

Yoshiyuki Shimosu
Paper Making Department, Chuetsu Pulp & Paper Co., Ltd.

 The paper manufactures in Japan have recently faced on necessity of manufacturing of a wide variety of products in small quantities,along with competition with the import paper and diverse needs of customer. Therefore, grade change on PM has been being on the rise and more controllability on PQS (Paper Quality and Control System) has been required for smaller loss on grade change.
 In this article, the operational experience of latest PQS which was replaced on Sendai PM4 in 2004 is introduced.

Latest Tail Threading Technology

Hiroaki Tagashira
Metso-SHI Co., Ltd.

 Paper machine production speed is getting faster, 1900 m/min for LWC, 1600 m/min for fine paper and 1500 m/min for board, and production per year is reached to several hundred thousand tons. In high speed machine, to reduce the loss caused by web break and grade change, and to urge the automation instead of experts, are very important things to improve the production efficient.
 Metso Paper developed improved tail threading device with advanced vacuum conveyor technology, PressForce for press section, SingleForce and DoubleForce1 for dryer section and FoilForce1 for calendar section. These new tail threading devices shorten tail threading time compared to conventional systems, enhance both human and mechanical safety by eliminating rope accidents, increase production line efficiency and reduce unexpected production downtime.

- Reduces Capital Intensity in the Bleach Plant -

Martin Ragnar
Kvaerner Pulping AB, Sweden
Kenji Umemura
Kvaerner Pulping KK, Project Department

 The technology relating to the bleaching of pulp relates not only to the chemicals used in the bleaching sequence but also to the washers and how the bleaching system as a whole is designed. In this paper, a novel bleach plant system called Compact Bleaching™ is presented. This system represents a paradigm shift in the design of a bleach plant, as it addresses a number of hot topics. With a Compact Bleaching™ bleach plant it is possible to reduce the electrical energy consumption by some 25 %, to handle the pulp fibers more gently and to reduce the building volume by as much as 25-50 %.

The Corrosion Resistant Materials for the Paper Industry

Hideaki Kawamura and Michio Nishi,
KITZ Corp.

 For the extension of the valve durability, KITZ has developed and manufactured high corrosion resistance valves such as super-duplex stainless castings and pure nickel castings and so on. On this paper we report on the effect on the corrosion resistance of the alloy elements and on the corrosion examination test results in the corrosion medium such as sulfuric acid, chlorine dioxide and ozone of used by the paper manufacture industry.

A Novel Insolubilizing System for Polyvinyl Alcohol (PVA)

Hiroaki Yokoi, Hideo Baraki and Kenji Nasu

 Recently, demands for efficient insolubilizing systems for polyvinyl alcohol (PVA) have been increased with market expansion of communications paper such as thermal paper. Various kinds of insolubilizing systems have been developed, but there are still problems to be solved, for example, insufficient performance, corrosion of thermal head in printer due to chloride ions. Thus, we have developed a novel insolubilizing system composed of carboxylated anionic PVA (A-PVA), polyamide-epichlorohydrin (PAE) and polyethyleneimine (PEI). Our novel system with insolubilizing agents called “PVA insolubilizer, CP series” has advantages of performance and reduction in chloride ion contents over A-PVA/PAE combination system.
 First, performances of various systems with or without PAE/PEI were studied for different types of PVAs, using cast film from their solution. The results showed that A-PVA/PAE/PEI combination system has an excellent insolubility. Application to over-coated layer in thermal paper is also exemplified. Then, mechanism of insolubilization by the combination system is briefly discussed.

Development of New Agent for Ink Jet Paper

Kentaro Ono, Hideki Touda and Junji Kasai
ZEON CORPORATION, R&D Center, Elastomer & C5 Chemicals

 Recently, the growth of Ink jet Paper industry is remarkable. That is because the quality of Ink Jet printing method has improved especially at personal use.
 The coating layer of Ink Jet paper include a large amount of cationic resins compared with offset printing paper system. Because the cation resins work as a receptor of anionic Ink jet reagent. The common SBR latexes have been used at Offset printing paper as a binder of coating layer. On the other hand, Polyvinyl alcohol (PVA) is the main binder polymer of Ink jet printing because normal SBR Latexes are modified by anionic surfactant, so it caused coagulation between anionic latex and cationic resin.
 In this case PVA-g-Latexes are developed as using just PVA as protective colloid having stability against cationic chemicals. In this report the characteristics of PVA-g-Latex and application as a binder of Ink Jet coating layer are introduced.

Anaerobic Treatment of KP Evaporate Condensate

Hidetaka Taneda, Osamu Asada, Masahiro Murata, Yuko Iijima, Takahide Monma, Yutaka Nuruki and Isao Onodera
Nippon Paper Industries Co., Ltd.

 Yufutsu mill of Nippon Paper Industries has started a long term trial on anaerobic treatment of the operational condensation from KP black liquor. In this trial, the effect of the condensation variation on the removal rate at this plant was observed. After several arrangements, this system will help the mill to decrease COD discharge and supply new energy resources without any cost increase.

On-line Hardness Measuring System for Paper Roll
“On-line RQP”

Mitsuhiko Matsuda
Nomura Shoji Co., Ltd.

 Uniformity in hardness of paper rolls is well known as one of important properties to avoid paper break and registering error during printing process where paper speed is increasing year by year. Therefore, to get accurate hardness profile on every paper roll is essential to establish a reliable quality management system.
 In 2003, Tapio Technologies Oy, a laboratory equipment manufacturer in Finland launched a handheld Roll Quality Profiler, RQP, with which anybody can easily and quickly measure paper roll hardness profile on paper rolls.
 Based on the advantage in design and experience in the handheld RQP, Tapio Technologies Oy has developed a new On-line Roll Quality Profiler, “On-line RQP”, and Nomura Shoji Co., Ltd. has started sales of On-line RQP here in Japan.

A Report on 2005 TAPPI Engineering, Pulping and Environmental Conference

Akihiro Kakehi*1, Takuya Yamamoto*2 and Tadashi Kano*3
*1 Oji Paper Co., Ltd.
*2 Nippon Paper Industries Co., Ltd.
*3 Japan Technical Association of the Pulp and Paper Industry

 2005 TAPPI Engineering, Pulping and Environmental Conference was held on August 28-31, 2005 in Philadelphia, PA. The number of registered participants was 457. Japanese participants were three people mentioned above. Seventy sessions were held during three days of August 29-31, six to nine of which were took place simultaneously. The number of presentations was about 180.

The Effects of Cationic Polymer Addition on Size Retention and Paper Sizing Performance in Rosin Emulsion Sizing

Yuko Okusa
Pulp & Paper Industry Section, Kurita Water Industries Ltd.

 Various cationic polyacrylamides (C-PAM) were added to pulp slurries for fixing rosin emulsion size, and the polymer properties influencing size retention ratio and paper sizing performance were studied. C-PAM with a high cationic density improved the retention ratio of rosin size, although paper sizing performance was low compared with C-PAM having a low charge density. These results show that sizing performance is influenced by not only rosin size content in handsheets but also the properties of C-PAM co-added to pulp slurries.
 When calcium carbonate filler and C-PAM with a high charge density were used, rosin emulsion size tended to adsorb on not only pulp fibers but also the filler. Both size retention and paper sizing performance were improved, when C-PAM was added after the rosin emulsion size addition to pulp slurries rather than the inverse addition sequence. Furthermore, the longer the duration time between rosin emulsion size and C-PAM additions was, the lower the size retention as well as the sizing degree of the rosin-sized paper were. These results suggest that C-PAM should be applied to pulp slurries after the addition of rosin emulsion size for achieving more efficient paper sizing performance.

Keywords:C-PAM, rosin emulsion, fixing agent, sizing degree, retention