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45 巻, 8 号
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畠山 兵衛1991 年 45 巻 8 号 p. 851-855
発行日: 1991/08/01
公開日: 2009/11/19
ジャーナル フリーPDF形式でダウンロード (7516K) -
神宮路 正, 甲斐 睦了1991 年 45 巻 8 号 p. 856-864
発行日: 1991/08/01
公開日: 2009/11/19
ジャーナル フリーThe supercalender is the machine which follows the paper coating and paper making processes and functions to give a paper high gloss and a smooth surface.
In the preceding stages of coating and paper machines, a hybrid twin wire machine and high fidelity blade coating machine were developed by which productivity, runnability and quality of product were much improved.
Attempts have been made to improve supercalender operating speed and runnability, even though no fundamental problems have been solved and no basic concepts of design have been changed over the last few decades.
However, from the view point of technical research and development, it can be said we are at the stage that the development procedures and methods have only just been established and we are starting to accumulate technical data and information.
One of the hurdles to be overcome is how to find a quantitative measure for the gloss, since this is really a human sense or feeling and yet is one of the major decisive factors for the quality of the product.
The hardware to control the gloss is there.
To combine this “hardware” and “human sensing” capability, fuzzy theory should be introduced into the design concept.
Following is a review of the supercalender research and development history focusing on how it responded to preceding process improvements for machine speed and productivity.
In order to meet high speed and efficient productivity in the ongoing processes, the supercalender has yet to resolve the following issues :
1. To speed up to the limit where elastic rolls tolerate.
2. To develop a technology for continuous operation.
3. To minimize elastic roll change time.
The auto-crown control roll improved the product quality remarkably.
The soft winding however also resulted in improved quality and more overall efficient productivity since this soft winding permitted technical innovation for the following processes of the finish winder.抄録全体を表示PDF形式でダウンロード (6712K) -
エーリッヒ クルツ, 清野 育朗, 佐藤 卓1991 年 45 巻 8 号 p. 865-874
発行日: 1991/08/01
公開日: 2009/11/19
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三浦 博1991 年 45 巻 8 号 p. 875-880
発行日: 1991/08/01
公開日: 2009/11/19
ジャーナル フリーSurvival in today's fiercely competitive paper markets depends on the runnability of the paper machine and the quality of paper produced. In the past six years over 70 systems have been sold worldwide for use on almost every type of paper machine.
The SENSODEC system has repeatedly provided on-line capabilities to determine short term variations that potentially disrupt production and product quality. This article attempts to describe the key area-runnability monitoring system-of SENSODEC-10.抄録全体を表示PDF形式でダウンロード (846K) -
ウルフ ゲルムゴールド, 川上 千明1991 年 45 巻 8 号 p. 881-886
発行日: 1991/08/01
公開日: 2009/11/19
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森田 昌敏1991 年 45 巻 8 号 p. 887-901
発行日: 1991/08/01
公開日: 2009/11/19
ジャーナル フリーThe chemistry and toxic effects of dioxins are reviewed. The possible sources of dioxins are chlorination of dibenzo-p-dioxin, dimerization of chlorophenols and other complex mechanism. The fate of dioxins in the environment is referred especially in relation to soil pollution. Analytical method is based on capillary column GC/MS either by low resolution and high resolution mass spectrometry.
Toxicology of dioxins is reviewed especially focussing on their mutagenicity and carcinogenicity. Current regulation standards are also referred.抄録全体を表示PDF形式でダウンロード (2633K) -
山田 卓良1991 年 45 巻 8 号 p. 902
発行日: 1991/08/01
公開日: 2009/11/19
ジャーナル フリーPDF形式でダウンロード (244K) -
藤田 夕子, 淡路 春夫, 松倉 紀男, 秦 邦男1991 年 45 巻 8 号 p. 905-921
発行日: 1991/08/01
公開日: 2009/11/19
ジャーナル フリーGroundwood pulp is produced from Japanese red pine (Pinus densiflora) and is used as one of important pulps for newsprint and other wood containing paper production in Japan. Due to the high resinous material content of red pine, the mill has been suffering from pitch troubles such as depositions in stock chests and on the center roll in the press section and resulting small pitch spots and holes in paper web. To cope with them, the seasoning of logs before grinding and the addition of so-called pitch control agents have been used effectively to some extent, but not satisfactorily.
A new enzymatic pitch control has developed and proved to be very successful for these troublesome pitch problems.
By studying on the behavior of resinous materials in red pine during the seasoning period and analyzing the pitch deposits in various parts of papermaking process, the nonpolar compounds of groundwood pulp pitch, especially triglyceride in it, were identified to be key compounds for pitch deposition. When resinous materials in the groundwood pulp slurry were treated with lipase in the laboratory experiments, it was found that triglyceride was hydrolyzed and that the pitch deposits were remarkably reduced.
The first mill trial was carried out on the Bel-Baie Former II papermachine in our mill. The lipase was added into the groundwood stock chest at the rate of 9, 000 U/kg to groundwood pulp. During the trials the pitch deposits were rarely observed at the stock chest and the dryer felt rolls. And the frequency of pitch holes in paper web was notably reduced. Furthermore an amount of pitch control agent such as fine talc was saved by using lipase. The results of the second mill trial indicated that unseasoned logs could be used up to 50% of total wood supply without pitch troubles.
Now this system is running successfully as a part of a normal operation in our mills.抄録全体を表示PDF形式でダウンロード (3830K) -
鍛治 裕夫, 桂 徹1991 年 45 巻 8 号 p. 922-926
発行日: 1991/08/01
公開日: 2009/11/19
ジャーナル フリーAn ultrasonic distance sensor was applied for measuring drainage characteristics of forming section. As the sensor was placed above the top side of wire, measurement could be done at any point on the forming section.
The ultrasonic sensor was carefully examined in terms of its validity against measured materials, temperatures and measuring distances. It was also calibrated against actual measurements. Slurry thickness and thickness variation (turbulence) of forming section in a Fourdrinier papermachine were evaluated as drainage characteristics. Obtained results show good agreement with what expected.抄録全体を表示PDF形式でダウンロード (612K) -
1991 年 45 巻 8 号 p. 927-933
発行日: 1991/08/01
公開日: 2009/11/19
ジャーナル フリーPDF形式でダウンロード (1160K)
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