紙パ技協誌
Online ISSN : 1881-1000
Print ISSN : 0022-815X
ISSN-L : 0022-815X
47 巻, 5 号
選択された号の論文の14件中1~14を表示しています
  • 小林 良生, 三戸 浩治, 稲垣 寛, 岡崎 洋
    1993 年 47 巻 5 号 p. 559-569
    発行日: 1993/05/01
    公開日: 2009/11/19
    ジャーナル フリー
    Kenaf is being appreciated anew in Japan as a substitute of pulp woods from viewpoints of global environmental conservation. Japan Kenaf Association focussed one of the projects on assistance to kenaf pulping in China and several times sent missions to Hunan and Anhui Provinces and also to the Headquator of kenaf project in China, Paper Industry Development Corporation in Ministry of Light Industry, in Beijing.
    This paper reports the survey on the present status and future plan on R & D concerning with kenaf cultivation and papermaking from kenaf bast and whole stems in China. It can be concluded that there are three important areas for development of kenaf papermaking, Yuanjang City, Hunan Province, Huainan Auhui Provice and Zhejiang Province. Kenaf papermaking plan in the 8th 5 Year Plan was also outlined.
  • 大谷 慶人, 坂本 和彦, 若井 誠
    1993 年 47 巻 5 号 p. 570-575
    発行日: 1993/05/01
    公開日: 2010/02/22
    ジャーナル フリー
    A combination of smectite and cationic surfactant is proposed to alleviate the secondary sticky problems occuring in the wastepaper processing. The contaminants in the white water can be removed by the dissolved air flotation and sedimentation with these chemicals. Furthermore, these chemicals are adsorbed on the stickies and reduce the sticking ability. The suitable formulation and possible application of the chemicals are discussed.
  • ゲイン P. A. C., コゴン L., フーパー J. J.
    1993 年 47 巻 5 号 p. 576-582
    発行日: 1993/05/01
    公開日: 2010/04/23
    ジャーナル フリー
    The physical properties of a coated sheet are strongly related to the coating structure developed through the interactions between the coating formulation, the basepaper and the coating machine during application of the coating layer. Control of coating structure and basepaper coverage is a complex phenomenon generally confined in discussion to a consideration of the dewatering and subsequent immobilisation properties of the colour, the particle packing characteristic of the mineral components in the colour and basesheet surface profile. The influences of coating colour solids, machine speed and the flow characteristic at the coating head (and roll applicator if applicable) are manifest particularly by the observed pressure penetration of fluid coating colour into the basepaper surface voidage, the instantaneous rheological properties of the pigment-based formulation and the runnability at the blade. Poor particle packing in the region immediately upstream of the blade tip is seen as a major contributing factor to blade bleeding and stalagmite formation. Many of the demands for superior coverage in LWC papers, and uniformity of coating structure in general, depend upon a highly stable packing configuration at the crucial region entering the blade nip. Film split effects in roll applicators, circulation instabilities in short dwell coating and sensitivity to blade geometry conspire to create non-uniformities in the coating structure. Amongst coating pigments, highly anisometric particle forms, such as platey kaolin, are particularly susceptible to orientational instabilities arising from the many complexities of these interactions.
    A novel approach to stabilising the flow upstream from the doctor blade is afforded by using a pre-metering blade unit which initiates a relatively small shear-related pressure zone under which the coating colour interface boundary with the basepaper is established and the colour is sheared prior to the final metering to the desired coat weight at the doctor blade. The effect of initiating coating colour dewatering and immobilisation of the colour in contact with the basepaper promotes contour coverage, and the pre-shearing serves to orient high aspect ratio particles with resultant significant improvements in runnability and coating quality including gloss and coverage. The primary design discussed refers in particular to the ECC International HARPPOC (High Aspect Ratio Particle Pre-Orienting Coater) as applied to the ECC International Helicoater® and published in the embodiment of the European Patent Specification EP 0198622 B 1.
  • 魚住 政己
    1993 年 47 巻 5 号 p. 583-588
    発行日: 1993/05/01
    公開日: 2009/11/19
    ジャーナル フリー
    Our new No. 8 Paper Machine for communication paper started up from May 1990 and has been operating successfully at Iwakuni Mill.
    This report described the summary of operation for last 2 years.
  • ロジン系中性サイズ剤と新規素材中性サイズ剤
    中島 正人
    1993 年 47 巻 5 号 p. 589-593
    発行日: 1993/05/01
    公開日: 2009/11/19
    ジャーナル フリー
    Two types of newly developed neutral sizing agents, rosin based SIZEPINE NT Series and a new material based KS-950, are described.
    Technically, SIZEPINE NT Series is designed for the good sizing effect in the papermaking of pH 68 range by modifying rosin for the necessary specific hydro-phobicity. Applications of SIZEPINE NT Series for the neutral papermaking using recycled paper containing calcium carbonate and for the alkali papermaking by the use of calcium carbonate filler are given as the illustrative example.
    KS-950, a new material based neutral sizing agent is, basically, so called non-reactive type thus it will overcome the shortcomings inherent to AKD and ASA. By a small dosage and at a wide pH range of acidic to alkali condition KS-950 gives good size effect which becomes apparent even right after the papermaking.
  • 宮本 良之
    1993 年 47 巻 5 号 p. 594-600
    発行日: 1993/05/01
    公開日: 2009/11/19
    ジャーナル フリー
    The No. 10 recovery boiler for Tomioka Mill was completed in May 1990 and KP plant No. 3 which was completed in August 1990.
    This boiler is a higher pressure, temperature, thermal efficiency and low pollutants emission recovery boiler of the largest class in Japan. 50% of the steam requirement in Tomioka Mill is produced by this boiler.
    At the first stage, the plugging that was characteristic of kraft recovery boilers occured in the supperheater and the evaporator. For the past two years, we have doing monthly burning tests of black liquor fuel.
    Now, with the experience of two years operation, we have improved the operation method of this recovery boiler. The following is the report of the No. 10 boilers operation.
  • 省エネルギーと燃料の安定確保を目指して
    津吉 伸哉
    1993 年 47 巻 5 号 p. 601-605
    発行日: 1993/05/01
    公開日: 2009/11/19
    ジャーナル フリー
    Mishima Mill, Daio Paper Corporation installed its first 6, 000 kW-generator turbine in 1963. The mill now has 17 boilers and 13 generator turbines under operation of which the total electric generating capacity is about 500, 000 kW.
    Since the oil crisis during the 1970s, the goal of the mill has been to have reliable energy supplies.
    In so doing, the mill has undertaken the following steps :
    1) switching the fuels from oil to coal.
    2) upgrading the efficiency of the recovery boilers.
    3) decreasing the purchased electricity.
    4) upgrading the efficiency of generator turbines.
    5) undertaking energy conservation measures mill-wide.
  • 浅田 信二, 赤松 健
    1993 年 47 巻 5 号 p. 606-609
    発行日: 1993/05/01
    公開日: 2009/11/19
    ジャーナル フリー
    We have developed the ash brick manufacturing system which recycles sewage sludge ash buried into landfill sites as industrial waste. This system produces paving bricks and tiles from 100% sewage sludge ash without any other additives.
    We have then studied whether this technique is applicable to pulp sludge ash. The result indicates that quality of products can be obtained. This system is found promising for recycling technique of pulp sludge ash.
  • リーネッカー R.
    1993 年 47 巻 5 号 p. 610-618
    発行日: 1993/05/01
    公開日: 2010/04/23
    ジャーナル フリー
    Design and development of a new pressure screen for the medium stock consistency range are demonstrated, which allow a process of screening also with smallest perforation-resp. slot widths.
  • 1993 年 47 巻 5 号 p. 619-624
    発行日: 1993/05/01
    公開日: 2009/11/19
    ジャーナル フリー
  • 山田 卓良
    1993 年 47 巻 5 号 p. 634
    発行日: 1993/05/01
    公開日: 2009/11/19
    ジャーナル フリー
  • 大井 洋, 田尻 政直, 岩永 雄三, 鈴木 正人, 青柳 哲夫, 大内 基弘
    1993 年 47 巻 5 号 p. 635-644
    発行日: 1993/05/01
    公開日: 2009/11/19
    ジャーナル フリー
    A pretreatment method with nitrite, nitric acid and oxygen for oxygen bleaching of kraft pulp is proposed as one of the possible methods for the reduction of organic chlorine compounds from bleaching process. The effects of nitrous acid pretreatment is compared with those of nitrogen dioxide pretreatment, and its bleaching mechanism is discussed.
    (1) Pulp at medium consistency is pretreated with nitrite (as NO2- 0.3% on pulp) and nitric acid (4% on pulp) at 90°C for 3 hours in the atmosphere of oxygen, and then is oxygen bleached.Kappa number of oxygen-bleached pulps can decrease to 34 for both beech and ezo spruce pulp pretreated.
    (2) The relationship between kappa number and viscosity of oxygen-bleached pulp after the nitrous acid pretreatment is similar to that after the nitrogen dioxide pretreatment which is correspond to Samuelson's S 3 process. Although Samuelson's S 3 process improves oxygen bleaching, it requires the two-stages pretreatment and gas-phase nitrogen dioxide. The nitrous acid pretreatment is free from these defects.
    (3) In the Samuelson's S 3 process, nitrous acid which is a reasonable by-product from the first-stage treatment with nitrogen dioxide is thought to be a key compound in decreasing kappa number of pulp in the second-stage treatment.
    (4) Coexistence of oxygen shows more effective kappa number reduction during the nitrous acid pretreatment. Veratryl alcohol, a non-phenolic lignin model compound, gives methanol under the nitrous acid pretreatment conditions with oxygen. It also gives more veratraldehyde in the presence of oxygen. These results indicate that oxygen in this pretreatment should play an important role in degradation and modification of lignin.
    (5) Four-stages (NODP) bleaching of beech pulp with nitrous acid pretreatment (N), oxygen (O), chlorine dioxide (D), and hydrogen peroxide (P) gives pulps with the same brightness (87%) and viscosity (20 cP) level as a conventional bleaching (OCEHD).
  • 第 1 報 紙の歪分布挙動測定システムの構築
    花田 淳成, 尾鍋 史彦
    1993 年 47 巻 5 号 p. 645-652
    発行日: 1993/05/01
    公開日: 2009/11/19
    ジャーナル フリー
    This work is intended to investigate the mechanical properties of paper sheet with particular emphasis of the effect of local microscopic deformation under tensile stress on overall strength properties of paper.
    For this purpose the interference holography-based moire fringe pattern was utilized in this work.
    A unique strain distribution measuring system in combination with laser holography and image processing method was devised and constructed.
    The interference holography was found to provide information on the two dimensional strain distributions in paper sample without direct contact with the sample.
    The following is the summary of the results obtained by this method.
    1. Interference holography measuring system is capable of recording clear interference moire image and permits visualization of the strain distribution of paper under tensile stress.
    2. The different deformation, that is elastic deformation and plastic deformation, provides different moire fringe pattern.
    3. The laser interference holography measuring system has potential applications to detailed analysis of physical properties of paper by non-contacts means.
  • 情報記録古紙の脱墨法
    野口 勉
    1993 年 47 巻 5 号 p. 653-659
    発行日: 1993/05/01
    公開日: 2009/11/19
    ジャーナル フリー
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