|2011 January JAPAN TAPPI JOURNAL
Vol.65, No.1 Abstracts
Low Energy LP Screen Technology
-Energy Saving and Rationalization of Stock Preparation System-
VOITH IHI Paper Technology Co., Ltd.
LP Screen has been developed as a fruit of our technology know-how, accumulated over 40 years. We proudly presented LP Screen to market as an extreme low power screen. Key technologies are in its inside structure - A design to make slurry pass with a constant velocity to whole screen plates, and a design to increase the consistency. It is our great honor to introduce key technologies of this innovative Screen as a recipient of a “Sasaki award 2010”.
High Efficient Four Shafts Kneader (UV-Breaker)
-Disperser for Ultraviolet Ink and Sublimation Ink-
AIKAWA IRON WORKS CO., LTD.
Recently, saving resource is an important issue in the Japanese pulp and paper industry. At the deinking process, to use low grade stock without decreasing the final product quality is required. Especially it is important to develop the technology to use magazine and MOW containing UV-ink and sublimation ink as raw material. Here we would like to introduce our “Four shaft” Kneader which would be the solution of the above problems.
Operating Experience by Retrofitting PM2 Press Section
Kanazu Paperboard Mill, Rengo Co., Ltd.
Rengo Kanazu Mill started its operation in 1961 as Kanazu mill of the former Nishino Seishisho and became what it is today by the merger of Rengo Co., Ltd. and Fukui Chemical Industry Co., Ltd in October 1991. The mill is situated in Awara City, the northernmost of Fukui Prefecture. The mill utilizes site area of 270,000 sqm and manufactures corrugating medium by PM2, the only papermaking machine as PM1 was scrapped in April 2010. Within the premise, there is a chemical and biotechnological plant production facility belonging to Kanazu Division and Central Laboratory (Fukui) under the control of Head Office, each operating under a different organization.
Ever since commencing operation in 1969, attempts to improve the running speed of PM2 have been made by replacement of No.3 press section with shoe press and modification of the driving device. However, significant aging was observed in the equipments used since start up especially at No.1 & 2 press section, where frames were deformed and affected operation. Therefore, press sections were replaced during August to September 2009. This report will introduce the outline of PM2 press section retrofit as well as some examples of its effects and troubles.
Operating Experience of Kvaerner Digester
Niigata Mill, Hokuetsu Kishu Paper Co., Ltd.
The N 9 paper machine which has the capacity of 350,000t/year has been built and has started for the production from September 2008 in Niigata Mill of Hokuetsu Kishu Paper Co., Ltd. With the plan to install the N 9 paper machine it was investigated that the production of LBKP in Niigata mill has to be increased 500t/day based on the total mill balance. All modifications and constructions were finished in May 2008.
In order to increase the production, Kvaerner digester were modified with installation of a new impregnation vessel.
The production of Kvaerner digester has been increased from 1,430t/day to 1,930t/day with this modification, and the total production of LBKP in Niigata Mill has been increased to 2,670t/day.
This paper reports outline and our operating experience of Kvaerner digester focused on a new impregnation vessel.
The Recent Activities of Energy Saving at Nichinan Mill
Nichinan Mill, Oji Paper Co., Ltd.
Each Oji mill has been working to reduce the total energy per 1.5%. In Nichinan Mill, for accomplishment, we carried out various means such as inverter and a pulley change, intermittent driving, a change to the high efficiency model, flow improvement.
This time, it introduces the approach case with energy conservation in this factory that executed it in one year in the past.
Introduction of Maryvale Mill, Australian Paper Pty Ltd.
Maryvale Mill, Australian Paper Pty Ltd.
Australian Paper has a long and proud history of producing quality paper products for Australian consumers. Australian Paper is Australia's largest manufacturer of fine papers for print and office applications and also produces high quality packaging papers.
Maryvale Mill is located in the heart of Gippsland, Victoria, 160 kilometres east of Melbourne. It was built in 1937 and has been upgraded periodically over the years to improve efficiency and environmental performance. The Maryvale Mill is Australia's largest integrated fine paper-making and packaging papers complex, producing more than 500,000 tonnes of paper every year. At Maryvale we are committed to best practices environmental sustainability - we recycle large amounts of water, use waste products as energy sources and we have some of the best effluent treatment processes in Australia.
The Maryvale Mill has three pulp mills, five paper-making machines, an ECF bleach plant, pulp lapping machine, finishing facility and a waste paper processing plant. Much of the Maryvale Mill fine paper output is A4 copy paper sold in Australia and New Zealand, including popular brands like Reflex and Australian Pure White.
The Measures of Low Frequency Noise and Vibration from Lime Kiln
Takaoka Mill, Chuetsu Pulp & Paper Co., Ltd.
The Causticizing Step in Kraft Pulping Process of the Takaoka Mill has two sets of rotary kilns, No.2 Lime Kiln (Ø2.7m×55mL) and No.3 Lime Kiln (Ø3.0m×65mL). Generally, the rotary kiln is known as apparatus made to generate low frequency noise and vibration from the air vibration by combustion and resonance. From 2005 age, some complaint on vibrations of fittings or televisions began to be brought from two or more houses around a factory.
A main subject of this paper is to explain about the taken measures of the low frequency noise and vibration caused from the Lime Kiln.
Operating Experience of Energy Saving Refiner Bar
Ishinomaki Mill, Nippon Paper Industries Co., Ltd.
Nippon Paper Ishinomaki mill has a capacity of one hundred thousand ton paper production per month, and the percentage of kraft pulp usage is approximately 50%. Pulp refining requires much energy, so we had often changed refiner bar in order to reduce cost and energy.
Conventional refiner bar is made by mold, so there is limitation of the plate design. But new model refiner bar (FineBar) is made by stainless steel and its design has remarkable originality. We have installed FineBar to LBKP refiners since April 2007. As a result, we achieved to save the energy consumption compared to conventional refiner bar. This report shows our operating experience and energy saving effectiveness in a period of using FineBar.
Promoting Forest Thinning through Utilizing Materials for Paper
-“Forest Thinning Support Paper” by the “Morino Chonai-Kai”-
Paper Div., Direct Sales & New Products Development Dept., Mitsubishi Paper Mills Limited
In collaboration with the environmental NPO (Office Chonai-Kai), Mitsubishi Paper Mills developed “Forest Thinning Support Paper” in 2005. The most unique feature of this paper is that 15 yen per kg of paper is used to promote forest thinning, which serves to improve the health of forests and increases their sustainability. Specifically, the up charge is paid to forest owners to help pay the costs of thinning operations. By buying this paper, users become “Forest Thinning Supporters”, contributing to environmental protection by making forests healthier. “Forest Thinning Support Paper” is spreading other Japanese paper manufacturers.
Electrification Case with Warm Water Manufacturing Equipment for Broke Pulper
Tokai Mill, Oji Specialty Paper Co., Ltd.
In our Tokai Mill, Oji Specialty Paper Co., Ltd., there exists a system to recycle broke paper, so called “Broke Pulp system”, in which hot water is used. Originally, steam for heating water was supplied from a boiler located in 380m apart from the system. Therefore, considerable amount of energy seemed to have been lost from this long distance piping between the boiler and the system.
In these circumstances, we decided to introduce heat pump water heater which is well known as higher efficiency than current steam boiler to save the energy consumption for the system. In addition, with benefit of its compact size and fire-free system, it was able to be placed adjacent to the broke pulp system and consequently the energy loss from the piping was expected to be reduced. When introducing the system, operation pattern was thoroughly simulated and optimized to level the hot water use. As a result, we were able to save a lot of energy, reduce CO2 emissions and minimize the initial introduction cost at the same time.
Here we report the details in this article.