• Journal of the Korean Wood Science and Technology
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• v.21 no.1
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• pp.51-58
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• 1993

The phenol resorcinol formaldehyde resin (PRF) adhesives which are curing at ambient temperature for structural purposes were synthesized. A PRF resin is produced according to the two-stage reaction system. In first stage, a low-condensed resol or methylolated phenol were prepared from phenol by reaction with a formaldehyde in alkaline condition. The molar ratio of phenol to formaldehyde was 1.0~1.4. And in second-stage, resorcinol was added to combine with the methylol group of a low-condensed resol(R/P molar ratio 0.3). The glue-joint strength, pot-life and workability of this synthetic PRF resin were superior to conventional ambient temperature setting adhesives such as oilic urethane or water based polymer-isocyanate resin for wood adhesives.

• Proceedings of the Korean Printing Society Conference
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• 2007.11a
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• pp.1-12
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• 2007

The rheological properties of an ink relate to its performance on the press and to the printing quality. So it is necessary to analyze the relationship between printability and the rheological properties of ink. Transfer rate of ink is one of the important factor deciding print quality. And it is concerned with rheological properties of ink. Thus, in this study, according to the molecular weight of rosin modified phenolic resin the rheological properties of ink were measured by rotational rheometer and then transfer equation of ink, density and gloss were mesured in order to examine the printability of ink.

• Journal of the Korean Graphic Arts Communication Society
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• v.26 no.1
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• pp.1-16
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• 2008

The rheological properties of emulsified ink must be maintained adequately at various shear rates or shear stress. So it is necessary to understand its rheological properties in order to regulate the printability of eumulsified ink on the performance. In this study, the rheological properities and printability of emulsified ink are investigated according to the molecular weights of rosin-modified phenolic resin.

• Journal of the Korean Graphic Arts Communication Society
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• v.24 no.1
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• pp.1-12
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• 2006

The rheological characteristics of an ink relate to its performance on the press and to the printing quality such as ink stability, transfer characteristics, mottle, squash, misting, dot gain, and so on. For lithographic print, the emulsification of ink is an important factor to determine the product. And also the rheological characteristics of the emulsified ink should be investigated. Thus, in this study, the effects of the changing molecular weight of rosin modified phenolic resin on the water-pickup ratio of neat inks were studied. And then rheological properties of neat inks and emulsified inks with changing molecular weight of rosin modified phenolic resin were analyzed by using rotational rheometer.

• Textile Coloration and Finishing
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• v.20 no.4
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• pp.21-30
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• 2008

To understand the complex hydrogen bonding structure, several phenolic derivatives and benzoxazine model compounds are synthesized and characterized by Fourier transform infrared spectroscopy (FT-IR). The estimation of molar extinction coefficients for various types of hydrogen bonding species is systematically carried out by the curve-resolving of FT-IR spectra. The distribution of hydrogen bonding species in benzoxazine model dimers is quantitatively analyzed. It is revealed that benzoxazine dimers and BA-a polybenzoxazine are mainly composed of intramolecular interaction rather than intermolecular interaction.

• Journal of the Korean Graphic Arts Communication Society
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• v.25 no.2
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• pp.1-13
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• 2007

The rheological properties of an ink relate to its performance on the press and to the printing quality. So it is necessary to analyze the relationship between printability and the rheological properties of ink. Transfer rate of ink is one of the important factor deciding print quality. And it is concerned with rheological properties of ink. Thus, in this study, according to the molecular weight of rosin modified phenolic resin the rheological properties of ink were measured by rotational rheometer and then transfer equation of ink, density and gloss were measured in order to examine the printability of ink.

• Journal of the Korean Wood Science and Technology
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• v.12 no.1
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• pp.38-43
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• 1984

Water soluble urea-melamine-phenol copolymer adhesive manufactured with 80 percent of urea resin contents was manufactured by different molar ratio for a high temperature curing type, and their properties and strengthes were examined through manufactures of plywood with Kapur (Dryobalanops spp.) veneers. The results are summarized as follows: 1. Specific gravities of air dried plywood manufactured from each adhesive ranged from 0.78 to 0.84 and their moisture contents met the KS requirement. 2. In dry and wet shear strength, $U_{80}M_{10}P_{10}$ copolymer resin showed the highest value and urea resin was the lowest, indicating that melamine and phenol were effective for increasing glue shear strength of urea resin. 3. In case of glue shear strength after boiling test, phenolic resin was the nest and melamine was not so effective as phenol on reinforcement of boiling water resistance of urea resin.

• 프린팅코리아
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• v.9 no.12
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• pp.108-111
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• 2010

한국인쇄학회(회장 구철회) 정기총회 및 추계학술논문발표회가 지난 11월 19일 오후 1시부터 서울인쇄정보센터 7층 강당에서 열렸다. 논문발표회에는 백용국 조선일보 차장의 'Gray balance를 활용한 신문인쇄 품질 향상을 위한 연구', 박정민 광명잉크 수석연구원의 'Vegetable Oil Ester에 따른 Offset 잉크의 물성 변화에 관한 연구', 이원규 부경대학교 대학원생의 '국내 오프셋 인쇄물 평가를 위한 최적의 Proofing 조건에 관한 연구', 오승재 부경대학교 대학원생의 '일반 교정인쇄물과 국내 오프셋 인쇄물의 비교 평가에 관한 연구', 송스엽 광명잉크 대리의 '로진변성페놀수지의 Cooking 온도에 따른 Varnish Rheology 물성 변화에 관한 연구', 허경영 (주)젠켐 대리의 '무극성 플라스틱 소재용 잉크 개발 및 소재의 부차성에 관한 연구', 권희경 부경대학교 대학원생의 '폐잉크를 이용한 스크린 인쇄용 블랙 잉크 제조에 관한 연구', 문성환 국군인쇄창 7급의 '국내인쇄환경에서 친환경잉크를 이용한 오프셋 인쇄의 색재현에 관한 연구' 등의 발표됐다. 본지에서는 '국내 오프셋 인쇄물 평가를 위한 최적의 Proofing 조건에 관한 연구'를 소개한다.

• Journal of the Korean Wood Science and Technology
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• v.45 no.3
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• pp.243-249
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• 2017

This study was performed to find out the optimum adhesive conditions on manufacturing a cross-laminated timber (hereinafter CLT) with using domestic Korean Pine (Pinus koraiensis). The adhesive conditions including a applied amount of the glue and a Pressure are the one of the most important key factors on establishing CLT production process. The shear strength was examined with differing the adhesive conditions while using Phenol Resorcinol Formaldehyde Resin Adhesive (PRF resin). The optimum adhesive conditions was confirmed to be: glue spread of $250g/m^2$ and Pressure of 0.8 MPa respectively. The grain directions of glued specimens were also considered, perpendicularly bonded and parallelly bonded groups. Shear strength of the former group showed lower values than the latter group which is considered to be the effect of a rolling shear. Meanwhile the shear strength of both group satisfied the Korean Standard (KS F 3021) and the European Standard (EN 14080 and EN 16351). The results derived from this study can be used as the basic data for manufacturing the CLT with domestic Korean Pine. And additional researches for the other species including domestic Korean Larch and Pitch Pine is also now being performed.

• Korean Journal of Environmental Agriculture
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• v.16 no.2
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• pp.161-165
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• 1997

This experiment were carried out to clarify the effects of several factory wastes on the emergence and seedling growth of five crop species, rice, Chinese cabbage, melon, and tomato. Wastes of three factories treated by several concentrations on the soil in which crop were seeded. In rice seedling experiments, the rice seedlings were treated with factory wastes hydroponically. Factory wastes used in the experiment were obtained from leather, phenol resin, and dye factory. The growth of rice seedlings was inhibited by each factory wastes, but the dry weight of rice seedling was increased by the low concentration below 1/16 dilution of leather factory waste. During 15 days, dry matter accumulation of rice seedlings treated with undiluted factory wastes decreased to 46.0, 51.4, -5.4% of control by treating wastes of phenol resin, leather, and dye factory respectively. The injury of crops by leather factory waste was severe in tomato but slight in barley. Waste of phenol resin factory affects highly both on Chinese cabbage and on melon. When dye factory waste was treated on each crop, all plants died in the treatments of waste solution which diluted to 1/8 of original waste. Tomato and melon were most sensitive crop species to the waste of dye factory. Although the responses of crops to each factory waste were various, the degree of injuries were more higher in vegetables than cereal crops.