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Volume 53, Issue 12
Displaying 1-17 of 17 articles from this issue
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[in Japanese]1999 Volume 53 Issue 12 Pages 1545-1546
Published: December 01, 1999
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESSDownload PDF (3657K) -
Heisaku Oyama1999 Volume 53 Issue 12 Pages 1547-1554
Published: December 01, 1999
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESSThe Paper Machine used during 35 years from the Meiji (1910) to Showa (1945) eras were mostly supplied by manufacturers outside of Japan, and on and after 1955s the paper machine have been manufactured and supplied by local machine builders under license agreement with foreign companies.
This article describes the historical background of wet end of Paper Machine, particularly the development of Headbox and Wire Part, i.e. from the Open type of Headbox to Hydrauric type and from Foudrinier with table roll to On-Top Former respectively.View full abstractDownload PDF (2223K) -
Experiences of New Forming TechnologyYasuhiro Hatano1999 Volume 53 Issue 12 Pages 1555-1560
Published: December 01, 1999
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESSThe OptiFormer is based on the roll and blade gap former technology. The strengths of OptiFormer lie in its customization for different grades and its ergonomic approach to detail design. The modular construction of the forming zone and new additive layering technology guarantee superior paper quality in all the main paper grades. The paper making process tested on a pilot scale ensures sufficient drainage capacity above 2, 000 m/min. Excellent mechanical engineering allows high speed running with good efficiency. New industrial design solutions bring the ergonomics, safety and maintenance of the former into the next millennium.View full abstractDownload PDF (10566K) -
MH FormerMasanobu Matsumoto, Naoyuki Harada1999 Volume 53 Issue 12 Pages 1561-1566
Published: December 01, 1999
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESSThe conventional gap former has been accepted as standard forming unit for newsprint and tissue grade but not for wood free and coating raw stock grades due to the issues such as z-direction strength and two-sidedness of the sheet.
MH FORMER has been developed to produce the high quality fine paper and coating raw stock through extensive fundamental research and innovative technology. The forming concept and main features of MH FORMER are described with the pilot machine and field data.View full abstractDownload PDF (3743K) -
Reijiro Nakano1999 Volume 53 Issue 12 Pages 1567-1575
Published: December 01, 1999
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESSSince the first Thermal Expansion type actuator (Thermatrol) was installed in domestic market in 1981. CD Weight Profile Control has been extremely growing in addition to Motor Drive and CP (Consistency Profiling) actuators. However, there seems to be some cases which can't keep the maximum control performance after the installation because of the change of control parameters, difference between the inlet position and QCS measurement position and the shrinkage pattern problem for the difference of machine conditions and some modifications.
This report introduces the basic concept, control algorithms and a support tool to get parameters for CD Weight Profile Control to help with keeping and developing the existing control performance. Also a completely new concept of Spectra Foil Sensor to get a control profile instantly at Wet-End will be introduced. This sensor with High-Speed CD control will be expected to meet the customer demand to accomplish the High-Speed paper machine in near future.View full abstractDownload PDF (10489K) -
Wet End OperationJunichi Tomita1999 Volume 53 Issue 12 Pages 1576-1582
Published: December 01, 1999
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESSN-1 paper machine at YONAGO mill, OJI Paper, has been in operation since September 1997. The new line has the capacity of 540 tpd of woodfree coated base paper. N-1 paper machine was supplied by Mitsubishi Heavy IND. LTD. of Japan and incorporated state of the art new technologies, such as horizontal gap former and double shoe press, to achieve high productivity and good paper quality. The wire width of the new machine is 8. 0 m with the trim width of 7. 36 m and the design speed is 1, 400 m min.
The horizontal gap former, “M H Former-H” combined with the “Concept IV-MH” headbox and the consistency profiling enables the wide paper machine to run at higher speed while maintaining superior sheet quality. The press section is conventional “TRI-VENT” roll configuration except the “ENP -C” shoe press at the third and the fourth nip, and the transfer felt at the fourth press. Each shoe press has the maximum loading capacity of 1, 000 kN/m. This article introduces the latest operating experience of the N-1 paper machine, focusing on the wet end operation.View full abstractDownload PDF (7117K) -
Toru Otowa1999 Volume 53 Issue 12 Pages 1583-1588
Published: December 01, 1999
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESSThis report describes wet-part-operating experience of PM 9 whose operation began at May, 1997.
We produce A 3 grade coated paper with this on-machine-coatar which is designed to attain the greatest productivity per capita possible and to bear the strongest worldwide competition. Now we are doing pretty good productionwise. As the key point is to keep good condition of wet-part operation, this report describes our operating experience of each section in the wet-part.
We summarize our experience for gaining good BD profile with the Module-Jet type headbox.Then we focus on the optimizing blade condition at forming box which is the core technique of the Duo-D former, and refer to the data on dewatering ability as well as operating conditions of Shce-Press installed in the third nip of wood-free base paper machine for the first time in Japan. We also emphasize the necessity for doctor-showering technique on ceramic roll to have longer blade life.
We are endeavoring to keep good operating condition in the wet-part and to have less defects, higher productivity and easily-controllable operating system under the motto “Easy Papermaking”.View full abstractDownload PDF (9794K) -
The Modulejet Headbox and its Latest TechnologyJun Murakawa1999 Volume 53 Issue 12 Pages 1589-1595
Published: December 01, 1999
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESSWe got the remarkable improvement of the CD basis weight profile by introducing the stock consistency control. New adjusting device and sensor for CD fiber orientation profile control are developed and we will be able to control the fiber orientation profile as well as basis weight profile. However the headbox has influenced the various fields of paper making not only CD profile control but also formation, variation on the MD, easy operation and simple maintenance. The Module Jet headbox of IHI-Voith Sulzes Paper Technology which was released in 1994 has achieved high performance on those any fields, and about eighty (80) Module Jet headboxes are operating all over the world.
This report shows our design concept and newest technology of headbox.View full abstractDownload PDF (8115K) -
Field Experience of MHI HeadboxesHumihiko Sakamoto, Keiichi Fujiki1999 Volume 53 Issue 12 Pages 1596-1603
Published: December 01, 1999
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESSWe have manufactured more than 400 headboxes for the past half a century. Since 1994, we have developed Concept IV-MH Headbox collaborately with our technical tie-up company. Beloit Corporation, to meet the market demands for high speed paper machines and currently selling the same as our mainstream headboxes. The Concept IV-MH Headbox has taken over the features of conventional headboxes and materialized more excellent flow stability and improved fiber dispersion. In addition, the Concept IV-MII Headbox is provided with the Consistency Profiling System as standard which provides consistency adjustment by the latest technologies.
This Bulletin reports the current situation of our headboxes laying stress on the fundamental performance of this Concept IV-MH Headbox as well as field experiment data for 5 years after sales release.View full abstractDownload PDF (7200K) -
Pulp Expert-The best way to Pulp Quality ControlTomoyoshi Nomura1999 Volume 53 Issue 12 Pages 1604-1610
Published: December 01, 1999
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESSAutomation of pulp testing with forming a hand-sheet is not so popular in Japan but pulp testing has been done manually by operators. Under the situation, it has been difficult to make pulp testing frequently due to limited number of shift operators and long testing time required. Furthermore, the difference among individual operators at measurement might influence on the results.
Pulp Expert (PEX) is the fully automated pulp testing system that was developed in Finland about 10 years ago. PEX measures rapidly more than ten kinds of physical and optical properties of pulp sample that is formed to sheet automatically in the PEX. Samples are taken automatically from up to 8 positions of process lines via sampling valves controlled by signal from PEX.
It allows mills to make pulp testing more frequently and consequently mills can keep good quality of their pulp, also it allows to consider saving manpower on each sift. At present PEX has been delivered more than 80 units in the world. PEX is receiving high reputation from users because of its good repeatability and good correlation with lab data.View full abstractDownload PDF (6621K) -
Hiroyuki Koide1999 Volume 53 Issue 12 Pages 1611-1614
Published: December 01, 1999
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESSReducing CO2 emission is the global key word. Concerning motor drive system, AC inverter system contributes energy saving & reduction of CO2. To achieve more reduction, new motors and new inverters are developed. We introduce the new products with latest technology and show the examples of application for them.View full abstractDownload PDF (3440K) -
OptiDwellMikko Tani, Hidehiko Yamazaki1999 Volume 53 Issue 12 Pages 1615-1621
Published: December 01, 1999
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESSValmet has developed a unique calendering method based on the SymBeltTM shoe nip press technology. The method, called OptiDwell, is based on a long nip dwell time and the use of an elastic belt. OptiDwell improves bulk and surface uniformity of the web. The long dwell time together with low specific nip pressure will result in bulk preservation, with no compromises to the surface properties. The elastic belt, in turn, provides uniform paper gloss and first-grade printability. The OptiDwell method has been proven in board calendering, and promising results have been achieved in calendering newsprint and woodfree paper grades. Up to 5% raw material savings have been gained both in production and customer trials.
A pilot OptiDwell calender with production scale rolls is available for customer trials at the Valmet Technology Center in Jä-rvenpää Finland.View full abstractDownload PDF (5654K) -
Mitsuhiro Matsuda1999 Volume 53 Issue 12 Pages 1622-1626
Published: December 01, 1999
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESS100% measurement of the sheet has been ideal for producing real high quality paper. Mechanical scanning sensors have always measured a very narrow diagonal trace on the two-dimensional moving web, so that the sensor is only able to detect less than 1 % of the variations in the full sheet. Now we are able to provide an innovative solution. Here, a non-scanning. full sheet imaging system called “HyperScan” has been realized. The measured data give paper makers completely new insight into sheet variability which has not been observed before. HyperScan is able to completely separate the measurement into machine direction and cross-machine direction. This system has been already installed at the world class wood free paper machine and the system has helped the paper maker to get the tremendous quality improvement and optimize process operation. This paper introduces the principle of the measurement technology and some application data from the field.View full abstractDownload PDF (11231K) -
[in Japanese]1999 Volume 53 Issue 12 Pages 1627
Published: December 01, 1999
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESSDownload PDF (226K) -
The Study for the Mechanism of Enzymatic deinking Part 1Mitsuhiro Sugino, Yasuvuki Matsusita, Mitsuo Takai1999 Volume 53 Issue 12 Pages 1630-1638
Published: December 01, 1999
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESSThe utilization of waste paper becomes important issue from the environmental point of view. But there are several technical problems to extend it, such as high COD loadin the effluent, sticky contaminants, and low productivity at paper machine. These problems would be due to a conventional alkaline deinking process. Although the utilization of an enzyme into deinking process has been reported to solve some of these problems, an enzyme can not be used for deinking because of its cost. In order to improve the cost performance and apply it into an actual process, first of all we have studied the deinking mechanism of toner printed paper by the enzyme. Several treatment enzymatic deinking trials have been done under the different condition of the enzyme dosage and mechanical force.
The treatment with a strong force could separate ink at the floatation efficiently. It could be due to the enzymatic action to separate fibers and the toner. We observed two types of hairy toner, surface hairy toner which stuck fibers on its surface, and internal hairy toner which contained fibers inside. By this treatment only surface hairy toner was modified into clean toner. However the enzymatic treatment without mechanical force could not change the form of the toner, and decreased the efficiency to separate ink at the floatation. We observed the similar result when a higher charge of the enzyme and the strong mechanical force were used. When toner size and the fiber characteristics were checked to see the reason of this phenomenon, the size was not changed, but most of fibrils on the surface of fibers and fines in slury were disappeared. It would be concluded that the floatation of the hairy toner could be difficult because of the enzymatic removal of fibrils on fibers and fines and of the less physical contact between the toner and the bubbles.View full abstractDownload PDF (8037K) -
Mechanism of Paper Surface Roughening (I)Kiyoshi Sasaki, Toshiharu Enomae, Fumihiko Onabe1999 Volume 53 Issue 12 Pages 1639-1645
Published: December 01, 1999
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESSSurface roughening of paper is a phenomenon which occurs when paper becomes wet in contact with moisture, water or aqueous liquid, and adversely affects print quality. Release of internal stress of paper was reported as one of the causes for surface roughening of paper. It is generally recognized that internal stress of paper is created in a sheet during drying under tension, and it is released when the sheet is wetted. However, there is anisotropy of created internal stress ; in-plane stresses induced by drying tension and out-of-plane stresses. The contribution of in-plane internal stress to surface roughening was investigated. Machine-made sheets were subjected to cycles of calendering and soaking in water. In-plane internal stress of those samples was determined in terms of a rate of tensile stress relaxation to logarithmic time by Kubat's method. In-plane internal stress decreased remarkably by soaking, but did not change by calendering. Smoothness of the samples with intenser calendering conditions decreased more substantially by soaking in water. Reduction in smoothness of the samples after soaking depended on that before soaking, but not on the degree of reduction in internal stress. Consequently, release of in-plane internal stress could not be always a main cause for surface roughening on a printing-related smoothness scale, but may be responsible for deformation on a large scale.View full abstractDownload PDF (2550K) -
[in Japanese]1999 Volume 53 Issue 12 Pages 1646-1649
Published: December 01, 1999
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESSDownload PDF (765K)
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