2007年2月 紙パ技協誌

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Technical Trend of Printing Industry, and Coated Paper/Imported Paper

Michio Haibara
Dai Nippon Printing Co., Ltd.

 "Graphic Arts" is now going to be "Printing Industry".
 In the printing industry, the digitalization of prepress-process has been established at the end of 1990s. And from the beginning of this century, the development of the printing technology is concentrated on the improvement of productive efficiency and the standardization of the print-quality. For this standardization, it tends to be more important to study interrelations between the print-quality and the paper qualities.
 This paper describes the technical trend of printing press and printing process, and the technical problem concerning the coated paper.


A State of Art of the Board Coating Technology

Katsumi Ishizuka
Coating and Finishing Engineering Department,
Voith IHI Paper Technology Co., Ltd.

 Low speed and small width coaters have been used for paperboard coating in the past. However, production by high speed and large width coating machine is recently getting popular. Due to this trend, uniformity of coating and drying at cross direction is becoming a great concern for manufacturers. High power drying becomes important factor, too.
 In order to cope with such demand, we developed new coating system such as DF Coater, SF Coater and HP-SCAF Dryer. DF Coater (Curtain Coater) could realize non-stop coating by no loss time from cleaning coating head and changing consumable parts.
Being developed based on Jet Fountain Blade Coater and DF Coater, SF Coater has both advantages from them.
 Due to high power drying, HP-SCAF Dryer could also realize drying uniformity without giving up stabilized web handling performance.


Operating Experience of Paperboard Coater

Kouhei Kawamura
Sec.2 Paperboard Production Dept.,
Nippon Daishowa Paperboard YOSHINAGA Co., Ltd.

 Nippon Daishowa Paperboard Yoshinaga Co., Ltd. was floated in April of 2003. We are positively working on the energy saving activity aiming "Paper Recycling mill".
 51 Paperboard machine has 4 on-line coater heads, started up in 1992 and with the purpose of getting into a new business for double-side coated bleached paper board business.
 As one of the pioneers for the recent trend of the combination of on-machine coater and gloss-purpose calender, 51 Paperboard machine has developed various experiences and improvements in terms of runnability, safety, productivity, and cost savings.
 This report is described on the operating experience Paperboard Coater of 51 Paperboard machine from start to now.


Recent Tendency of Coating Technologies

Yasuhiro Hatano
Metso-SHI Co., Ltd

 Since the first announcement of introduction of OptiConcept machines for this century several years ago, Metso Paper have put many OptiConcept machines into world-wide market. The machines with design speed of 2000 m/min and 10m wide are running now. As for coaters, Metso Paper also has OptiCoater technologies, for which different types of coater heads can be supplied depending on each customer's puopose. For example, film coaters are now widely used for all on-line LWC production machines. Blade coaters are widely used for coated woodfree paper production and coated board production. Then, recent examples of new coaters are non-contact coaters such as spray coater and curtain coater. Drying concept for coating station has been also developed in these years. Air dryers plays major role for drying coated papers.
 In this paper, the author will describe representative OptiCoater coating technologies.


Operating Experience of Water Jet Turn-up Device

Toshinao Imai
Kasugai Mill, Oji Paper Co., Ltd.

 The CM3 at Kasugai Mill, Oji Paper has been in operation as off line coating machine since 1991. Thanks to the fine improvement of PM10 which produces base paper for CM3, production rate of the coater has increased gradually, but on the other hand, unsuccessful turn up at high weight grade became a serious problem. In order to achieve stable operation, the Water Jet Turn-up device has been installed in reel section in August, 2005. In this report, I describe the outline of remodeling, the operation experience, and the effect of the project.


How to Detect Defects on Coating Paper
- SmartView Inspection System Technology -

Satoshi Suzuki
Surface Inspection Systems Division, COGNEX K.K.

 The Cognex SmartViewR Inspection System have been successfully inspecting various grades of coating paper in coater, supercalender, cutter and sorter. And Cognex developed Advanced Winder Advisor, which locates defects at the re-reeler or winder and controls the winder to stop on the selected defects.
 We will introduce SmartView technology focused on how to detect and identify defects on coating paper.


Low Intensity Refining
- The Approach from the Refiner & the Refining Fillings -

Kazumi Fujita
Aikawa Iron Works Co., Ltd.

 From ancient times, the refining has been a most important process to decide the paper characteristics, but the refining style changed with the times. A thing having the biggest influence in this transition is a change of paper stock itself. Recently, the planted LBKP fiber, and the recycled secondly fiber, these are the today’s main raw materials for paper, length are becoming the shorter and shorter, accordingly their freeness are also getting to lower and lower. Today, therefore, is the big turning point of the refining from cutting to the "Low Intensity Refining" which can keep the length of fiber and change the shape of fiber to improve the paper mechanical properties. In this report, we AIKAWA IRON WORKS introduce our approach for the "Low Intensity Refining" with the capital refiner and the refining fillings.


The Development of New ASA Sizing Agent and that Systematized

Kenji Tsunekawa and Kazutaka Kasuga
R & D Dept., SOMAR Corporation
Koichi Tadaki and Hiroyoshi Numoto
Technical Dept., SOMAR Corporation

 In recent year, low priced wet-end chemicals tend to be used in paper industry because of reducing costs and the productibity. Also the conditions of runnability are getting worse by increasing the recycle fiber sources and the improvement of runnability. Alum used in acid papermaking brought the ability regarding fixation of Rosin sizing agent. But the usage of Alum is getting down as the neutral papermaking is growing because of the weak ability of Alum in higher pH. Rosin sizing agent needs Alum to fix pulp fibers. So some problems happen in neutral papermaking about the fixation of Rosin sizing agent.
 And the increase of AKD usage in neutral papermaking tends to decline because of the quality and the cost. In stead of AKD and Rosin sizing agent, Alkenyl succinic anhydride (ASA) is being paid attention in neutral papermaking. ASA sizing agent is spreading in Europe and USA but is not used so much in Japan. In future ASA sizing will be spreading in Japan because of the supply shortage of Rosin and reducing costs.
 We need to control the deposit generating by ASA sizing agent in order to make ASA sizing spread in Japan. We investigated the method of emulsion, emulsion polymer, dispersion system and optimum conditions of particle size. Also we developed the new dispersion system in order to control the deposit by ASA sizing agent.


Optimizing the Paper Machine and Its Tools
- Scanpro, Its Method and Features of the New Felt Moisture Meter -

Yoshihiro Ohkawa
Lorentzen & Wettre Japan K.K.

 Press and Dewatering at press part in paper machine has impact on paper properties, cost of dry part and run-ability, so that optimizing its part is always required to machine operator. For its purpose, in order to know press condition, Scanpro moisture meter was developed and introduced into the market in early of 1970 by AB Scanpro where in Sweden (now merged with AB Lorentzen & Wettre). Since developed, delivered more than thousand this meters to felt suppliers, chemical suppliers, machine suppliers and mills all over the world have been used as benchmark measurement. Now, meeting demand of more efficient measurement, two kinds of Scanpro meters are provided, which are Presstuner for measuring moisture and Feltperm for measuring water permeability. Trial by using both meters ensure more understanding the press condition and create benefit. This presentation introduces this method and the feature of New Felt Moisture Meter, which has just developed and has more advanced analyze-able function. Short-term effective investment with New Felt Moisture Meter can be promised.


The Operational Experience of New Canvas Cleaning Facilities "AOKI Cleaner"

Toshio Kameyama
AOKI Kikai Co., Ltd.

 Currently the utilization of recycled old paper ha been accelerated especially on paper board manufacturing. This tendency has caused defective troubles at paper manufacturing process originated by sticky materials and effected drastically on machine run ability.
 For this countermeasure of rejecting sticky materials from the process, canvas cleaning method might be the best way. Most paper mill’s operators has expected such method as higher cleaning efficiency with reasonable price.
 Based on the operational experience with "Canvas clean roll" developed by ourselves, new canvas cleaning facility "AOKI cleaner" has been developed after remodeling and adding many ideas on it. This report is referred the operational experience of "AOKI cleaner" on paper board machine.


About Flow Characteristic of Low Viscosity Coating Materials in High Shear Region

Tazuko Watanabe and Keisuke Miyamoto
Nihon SiberHegner K.K.

 In practical applications the following information is important concerning the rheological behavior of coatings:
 ·The propose of coating for the filter of flat panel and the special paper of ink jet printer
 ·To take flow behavior of high shear rate region for the process of coating (ex. thixotropy
  behavior, leveling, sagging, layer thickness.
 This paper informs newer rheological measurement about the behavior coatings. Presented is a new test method for the high shear rate region of the coating materials.


Application of the Coating with High Wear and Stain Resistance to the Parts for Paper Manufacturing

Tokumi Ikeda, Teruyuki Kitagawa and Junji Taguchi
Nomura Plating Co., Ltd.
Yong-Bo Chong
Research Institute for Applied Science

 Our company has offered various wear (for the paper manufacture industries) parts and mold-release characteristic parts until now. However, it is not that all are also satisfied and nothing -- it is -- there was a case where meeting the request could not be finished. So, in this announcement, our company introduces the various plating which exceed the plating which can be offered now. Although all needs cannot be grasped since this plating is a utilization stage, it is the plating which is advancing by our company towards utilization.


The Feasibility of Recycling Zeolite Synthesized from Paper Sludge (CPSZ)
Part 1:The Evaluation of the Chemical and Mineralogical Properties of CPSZ and the Feasibility of
     Mass Production

Takao Ando and Takabumi Sakamoto
Faculty of Risk and Crisis Management, Chiba Institute of Science
Kimio Hiyoshi
Fuji Industrial Research Institute of Shizuoka Prefecture
Naoto Matsue and Teruo Henmi
Department of Agriculture, Ehime Univ.

 We tried to synthesize the carbonized paper sludge zeolite (CPSZ) by alkali hydrothermal treatment for the carbonized paper sludge (CPS) that was collected from the paper recycling association in Fuji city of Shizuoka Prefecture. First, the synthesis conditions were optimized in laboratory scale alkali hydrothermal experiments (alkali solvent = 20mL) on a hot plate. It was found that the coexistence of carbon-species with the precursor of zeolite (i.e. metakaolinite) scarcely affected the crystallization of zeolite. From the measurement of N2 adsorption isotherm, the specific surface area of carbonized material in CPS increased by 3 times through the alkali hydrothermal treatment. Next, the synthesis of CPSZ on the semi-plant scale was carried out in a 50 L boiling reaction-chamber (alkali solvent = 40L). There was no difference between the products in 20 mL and in 40 L alkali solvent scale experiments in terms of mineral assemblage and other physical properties. In conclusion, the CPSZ can be mass-produced up to the scale of 2000 times with alkali solvent volume. It means that the mass-production of CPSZ is possible to industrial scale.

Keywords: paper sludge, zeolite, alkali hydrothermal treatment, meso pore, recycle