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Volume 51, Issue 9
Displaying 1-10 of 10 articles from this issue
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Masashi Sumimoto, Sanro Tachibana1997 Volume 51 Issue 9 Pages 1271-1294,053
Published: September 01, 1997
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESS1. As shown in Fig. 1, changes in the amounts of coniferyl aldehyde groups in both GP and TMP were shown by the treatment with aqueous H202 or ethanolic H202.
2. Mechanochemical conversions of t-CAMe are shown in Fig.3.
3. One hr treatments for both guaiacyl glycerol-β-guaiacyl ether and veratryl glycerol-figuaiacyl ether with a CBM gave no significant product. Therefore, veratryl glycerol-β-vanillin ether (II) having high polarity was prepared and studied it's mechanochemistry. Treatment of this compound (II) with a CBM for lhr, splitting reaction of a large amounts of para-carbonyl phenol ether occurred to give 18.8, 4.8, 4.0, and 0%, respectively, as shown in Table 2.
As shown in Fig.5 and 6, mechanochemical treatment of veratrylglycerol-β-vanillin ether with a CBM furnished at least seven kinds of products. In Fig. 7, chromophores were produced through mechanical pulping followed by alkaline H2O2-bleaching of wood lignin.
Four types of phenyl coumarane model compounds IP-IVP were prepared as shown in Fig. 8, 9, and the following synthetic route of phenyl coumarones: 4and 5were also shown in Fig.9.
As shown in Fig. 10, mechanochemical reactions of four kinds of phenyl coumarane model compounds (I-P-IV-P) proceed via compound (A) to stilbene type of compounds (II-S, IV-S). On the other hand, the intermediate compound (A) proceeds via (D) and (E) to give III-R and IV-R. The last one from (I-P-IV-P) affords (B) and (C) to give compounds (I-S, III-S). As is well-known, alkaline-H2O2 bleaching of (I-S, III-S) furnishes hydroquinone and quinone, respectively, as shown in Fig.11-15, respectively.
As shown in the splitting reaction between Cα-Cβ bond in Compound [I], at least eight compounds were confirmed in Fig.20 and Table 6. In these cases, three radical species“·O2H, ·OH, and ·H” occurred to give ultrasonic waves as shown in Fig. 22.
Treatment of creosol with HCHO furnished first to give condensation products [I], [II], and [III], respectively, as shown in Fig. 23 and Table 7.View full abstractDownload PDF (3776K) -
Takahito Hirasawa1997 Volume 51 Issue 9 Pages 1295-1307,053
Published: September 01, 1997
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSVarious requirements have been rising for paper strength resins due to large technological and economical changes in papermaking industry, such as greater use of secondary fibers and higher productivity. Under these circumstances, recent trends in polyacrymide (PAM) based dry strengh resins and surface strengh resins, are described.View full abstractDownload PDF (2429K) -
Shin-ichi Kimura1997 Volume 51 Issue 9 Pages 1308-1319,054
Published: September 01, 1997
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSSince size press solutions are 100% retained and the material is concentrated near the surface, the role of size press chemicals are still more important from its advantages and wide performance requirement and grade development of high speed production, diversification of papers and printing system. Starches (oxidized, mill modified), poly vinyl alcohol (PVA) or polyacrylamide (PAM) has functions as surface sizes by size press or by calender. Consumption of size press chemicals in 1995 are 20 thousands of metric tons of starches, 17 thousands of PVA, 5 thousands of PAM. In these chemicals, market of PAM is grown by its several advantages.
Polyacrylamide Coating Agent:
Molecular weight of conventional polyacrylamide coating agent is around 0.3 to 0.5 Million. It is confirmed that paper strength is positively molecular weight. Recently, there are three types of commercial products of which molecular weight is 0.3 to 0.5 million, conventional type, 0.8 to 1.0 million, medium type and 2 to 3 millions, higher molecular weights type, and they are used properly in the right application or in the type of size press coater. Moreover, the new coating agent for news paper is developed which shows both size performance and peper strength.
Chiemicals for ink-jet Printability:
Full color ink-jet printing has grown dramatically in popular for used with personal computer. On the other hand, multi purpose paper for monochrome ink-jet, PPC or exclusive papers are applied for full color ink-jet printing by printing media. Common multi purpose paper for monochrome ink-jet and electrophotographic printing has already come into the market. Exclusive papers are applied for full color ink-jet printing to maintain sufficient ink penetration rates and water resistance without color bleed, however disadvantage in the printing application of its price and great bulk are not satisfied. They are considering of requirement of plain paper for full color ink-jet printing. Our newly developed CJ-1100 improves in full color ink-jet printability performance such as excellent water resistance and higher optical density for plain paper as a result of fixation of dyes and insoluble in water.View full abstractDownload PDF (2324K) -
Seika Tay1997 Volume 51 Issue 9 Pages 1320-1332,054
Published: September 01, 1997
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSThe practice of pitch dispersant without retention aid drastically increased resinous substance at the headbox. The paper made under such condition performed badly in pressrooms on Man Rowland Offset with common impression cylinder (CIC) configuration. The CIC roll was heavily covered with fibre fragment which contained 50-70% wood extractives. The polyethylene oxide (PEO) retention program was applied in combination with Enhancer A for pitch control. The paper quality in view of linting and sticky deposition on offset presses was remarkably improved.
Several new enhancers were evaluated on the dynamic jar in order for further improvement of first pass retention. The machine trial on one selected enhancer proved to be very encouraging.
However, the introduction of deinked pulp (DIP) later in 1995 complicated the papermaking chemistry due to the carryover of contaminants. The initial PEO retention program was suffered, resulting in the build-up of fibre fines and stickies in threcirculating white water. The sticky deposition on the forming wire and pressing felts contributed to crumbing problem and poor stock dewatering, and consequently resulting in wet end breaks. A new retention program based on bentonite/enhancer/PEO was commenced in June 1996. This is considered a breakthrough, giving a significant improvement in machine operating efficiency.View full abstractDownload PDF (2453K) -
Wood Science Committee1997 Volume 51 Issue 9 Pages 1333-1346,055
Published: September 01, 1997
Released on J-STAGE: November 29, 2010
JOURNAL FREE ACCESS -
[in Japanese]1997 Volume 51 Issue 9 Pages 1347-1348
Published: September 01, 1997
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSDownload PDF (326K) -
Tomoyuki Terao, Masayuki Yamamoto, Terunobu Fukui1997 Volume 51 Issue 9 Pages 1349-1355,055
Published: September 01, 1997
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSPorous structure of the coated layer affects the ink setting rate. It is known that a larger pore volume of the coated layer provides a higher ink setting rate. However, regarding the porous structure of the coated layer, it is unclear what pore diameter provides a higher ink setting rate. This report discusses our study on the influence of the pore diameter distribution on ink setting rate.
The ink setting rate of the coated layer was derived from the set-off test by using three types of offset printing inks. On the assumption that a reduction in the density of the set-off ink after the impression is caused by transferred ink area reduction of the constant thickness ink layer, a good linear relationship between the transferred ink area ratio and the square root of time that lapsed after the impression was obtained. Then, we defined the slope of the line as ink setting rate of the coated layer.
The porous structure of the coated layer was measured by means of mercury porosimetry. To distinguish the porous structure of the coated layer from that of the base paper, samples that were gotten rid of the base paper by peeling off were subject to measurement of the pore volume and the pore diameter distribution.
Seven coated papers that had a different porous structure of the coated layer and a different ink setting rate were prepared by using two types of CaCO3 having different average particle size. The relationship between the ink setting rate and the porous structure of each coated layer was investigated. As a result, it was suggested that the volume of the pores having a diameter of from 0.12 μm to 0.15 μm affected the ink setting rate most.View full abstractDownload PDF (3145K) -
On Single Wall Corrugated Fiberboard made of Different Surface KraftlinerSatoru Matsushima, Shigeo Matsushima1997 Volume 51 Issue 9 Pages 1356-1365,056
Published: September 01, 1997
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSWe attempted to express a improvement formulation of elastic stresses for single wall corrugated fiberboard (SWCF) made of different kraft-liner (KL) under uniform bending (the moment axis perpendicular to the machine direction). From this formulation, bending stresses of KL and semichemical corrugating medium (SCM) for SWCF were obtained, and relations between the strength and the shape or the longitudinal elastic modulus of SWCF elements were discussed.
Then following results are obtained.(1) A maximum of the absolute value of the bending stress for KL is on the outer surface in the side of the small thickness and modulus. Maximum δsmax of the absolute value for the SCM bending stress is on the inner surface at the KL·SCM joint in the side of the large thickness and modulus.(2) Maxima δk1max and δk2max of absolute values for KL bending stresses (KL1: plus stress and KL2: minus stress) decrease slightly with the increase of Ts, and δsmax increases obviously.δ1max, δk2max and δsmax decrease obviously with increases of SCM wavehight h and KL1 thickness Tk1.(3)δk1max and δk2max are constant for the increase of SCM wavelength L, and δDsmax increases with the L increase obviously.View full abstractDownload PDF (1665K) -
1997 Volume 51 Issue 9 Pages 1366-1373
Published: September 01, 1997
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSDownload PDF (2903K) -
[in Japanese]1997 Volume 51 Issue 9 Pages 1398-1402
Published: September 01, 1997
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSDownload PDF (873K)
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