• Title/Summary/Keyword: clay layer

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Effects of Pigment Blending and Thickener Characteristics on Calendering Response and Structure of Coated Paper-Effect of Pigment Blending on Coating Properties- (도공 안과의 혼합과 증점제의 특성과 도공지의 광택 발현성과 구조적 특성에 미치는 영향)

  • 박종열;이학래;김병수;정현채
    • Journal of Korea Technical Association of The Pulp and Paper Industry
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    • v.30 no.2
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    • pp.62-73
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    • 1998
  • The aim of this work was to investigate the effects of pigment composition on the calendering response and structure of the coated paper. Calendering response of the coated paper was determined from the gloss values of the uncalendered and calendered coated papers, and the relationship between gloss and coating structure was discussed. The surface and cross section of the coating layer was observed using a scanning electron microscope to examine the coating structure. Coating layers were hardened in epoxy resin and polished with carbimet paper disc for preparing SEM samples. Maximum calendering response was obtained for the coated paper prepared from 80pph of clay and 20pph of ground calcium carbonate (GCC) as pigments. Photomicrographs of the surface and cross section of the coating layer show that clay tends to form dense coating structure, while GCC tends to form bulky coating layer.

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Interpretation of Making Techniques and Material Characteristics for Molding Clay of Four Guardian Statues in Wanju Songkwangsa Temple, Korea (완주 송광사 소조사천왕상의 재질특성 및 제작기법 해석)

  • Han, Doo Roo;Lee, Chan Hee;Jo, Young Hoon
    • Journal of Conservation Science
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    • v.28 no.4
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    • pp.353-366
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    • 2012
  • This study was interpreted the making techniques of the Four Guardian Statues in Wanju Songkwangsa Temple, and retained basic data necessary for conservation treatment and restoration of the same material by estimating the soil source. The molding clay used in the Statues showed a variety of material characteristics according to different layers. The first and mid layers estimated as the original molding clay are composed of the same kind of soil. The soil of the finish layer was also confirmed to be genetically similar to that of the first and mid layers, despite little discrepancy. The former restoration layer was inconsistent in material characteristics with the original molding clay in every result of analysis. As a result of gamma radiography, making techniques of the Statues were able to identify the figure of the frame connecting the woods of main pillar frame to sub-frame and steel wire with ㄷ-clamp, nails and straw ropes, and the molding clay constructed upon the frame. Meanwhile, provenance interpretation confirmed that the soil of the estimated provenance area is of the same origin as the soil of the finish layer, and therefore is an appropriate material for conservation treatment. This result will contribute to the research on making techniques of the molding clay Statues.

접합요소를 이용한 복합기초지반의 변형해석

  • Park, Byeong-Gi;Jeong, Jin-Seop;Lee, Mun-Su
    • Proceedings of the Korean Geotechical Society Conference
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    • 1987.06a
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    • pp.51-80
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    • 1987
  • In this studys a numerical analysis on the defomation of foundation layer was carried out by indroducing joint element. The method using the joust element between adj assent different materials has been originally developed for rock behavior(Goodman, et al. 1968) . The application of this method to the interface between the footing and soil layer proved satisfactory(Ghaboussi p et at. 1973). Authors tried to obtain the deformation of rrcompound foundation layerg", which vertically or horizontally or both consists of the natural(or intact) soft clay layer and the layer improved artificially in order to get high stiff-fness with replacement or chemical treatment to reduce the excessively detrimental settlemellt or lateral displacement in case of banking or building the civil structure on the soft layer. The joint conditions were classified into three categories : contacts sliding and separation. By coupling "JOINT" as a subroutine into multi-purpose code for the finite element method of the foundatlion daveloped by authors on the assumption that shearing and normal displacement can not be coupledl which terms pinon-dilatant" and by selecting modified Cam-clay modeIP the deformation analysis was performmed. The results using joint element were compared with those secured without introduction of joint element Nain results analized are as follows : 1. For the prediction of settlement and lateral desplacement, the result due to joint element was evaluated larger, which was regarded safe. 2. For the determination of ultimate bearing capacetyi the value using joint element appeared smaller by 20%, which was also safe.

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Study About Filling-Material for Clay Layer Restoration of Seated Amitabha Triad at Muwisa Temple (Treasure No. 1312) (보물 제1312호 무위사 아미타여래삼존좌상 소조층 보수 충전제에 관한 연구)

  • Lee, Su Yea
    • Journal of Conservation Science
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    • v.31 no.1
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    • pp.1-11
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    • 2015
  • Seated Amitabha Triad at Muwisa Temple (Treasure No. 1312) had been known as wooden Buddha statue, but a precise safety inspection revealed that the statue is terracotta Buddha statue made with clay. The clay layer of Amitabha Triad was conserved due to its severe damage. In this study, experiments were conducted to produce the most appropriate filler for the conservation treatment of the seated Amitabha Triad. Mixed clay samples with various ratios were produced and surface hardening state, crack, color change, and shrinkage of the samples during dry process were measured. Loess, fine sand powder, and cotton were used to produce the mixed clay for the filler with six different ratios and then 12 different concentration glues made with glutinous rice glue, Pachymeniopsis Elliptica glue, and animal glue were added as adhesives. Total 72 types of samples were prepared and comparative study was conducted. As a result, when the mixed clay contains 2.5% cotton compared to the weight per cent of loess and fine sand powder and also loess and fine sand in the mixed clay have a 15:1 ratio, the mixed clay had the lowest shrinkage. Animal glue is considered as an appropriate glue since it had small color change, low physical property change and shringkage. Therefore, mixed clay (loess:fine sand=15:1) mixed with 15ml animal glue is likely to be a suitable filler for conservation treatment of the seated amitabha triad at the Muwisa Temple.

Improvement of printability by the new designe of the multi-layered coating structure (II) - The effect of pigment blending in pre-coating layer on characteristics of top-coating layer - (다층도공층의 설계에 의한 인쇄적성 개선(제2보) - 프리코팅층의 안료배합이 탑코팅층의 특성에 미치는 영향 -)

  • Kim, Sun-Kyung;Won, Jong Myoung;Lee, Yong-Kyu
    • Journal of Korea Technical Association of The Pulp and Paper Industry
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    • v.48 no.2
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    • pp.61-67
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    • 2016
  • This study was carried out in order to investigate the effect of pigment properties in a pre-coating layer on the characteristics of a top-coating layer and the print mottle of the coated paper. Five different pigments were applied for this study as raw materials for the pre-coating layer. The properties and print mottle of the coated paper samples were evaluated according to the coating color formulation. Type of pigments appliied in a pre-coating layer was one of the most important factor to control the properties of pre and top coating layer. Surface properties of pre and top coated paper were improved by blending GCC which had smaller particle size, with clay. Properties of a top-coating layer was affected by the pigment properties used in the pre-coating layer. It was found that print mottle of coated paper can be improved by replacing part of GCC with smaller particle size GCC or clay in pre-coating layer.

Characterization of Materials and Color Formation for Black Potteries from the Proto-Three Kingdoms Period in Ulsan, Korea (울산지역 원삼국시대 흑색토기의 재질 및 발색 특성)

  • Kim, Su Kyoung;Jang, Sungyoon;Lee, Chan Hee
    • Journal of Conservation Science
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    • v.37 no.2
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    • pp.77-89
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    • 2021
  • In this study, materials and color formation techniques were assessed for black potteries excavated from the Janghyeon-dong, Jungsan-dong and Gyodong-ri sites during the Proto-Three Kingdoms period in Ulsan, Korea. Although the black potteries were black superficially, the inner cores were either black or reddish yellow. Microscopy analysis identified that body clay was used for reddish iron oxide rich soils with quartz, alkali feldspar and mica, along with grains of myrmechite texture. Additionally, as marginal differences exist in the contents of SiO2, Fe2O3 and CaO, the composition of the host rock and clay distributed around the sites was affected. Thus, we can deduce that pottery was made by soiling at a short distance. Raman spectroscopy results revealed that the black layer of the black pottery was used as amorphous combustion carbon. In addition, as a transparent layer of brown lacquer was observed on the substrate that was in contact with the surface layer, the black layer of the pottery induced black color development by a combination of combustion carbon and lacquer. Based on the mineral composition and microtexture of the body clay, the firing temperature of the potteries seemed to range from 750 to 850℃, whereas the lacquer layer was pyrolyzed at 468℃ by thermal analysis. Therefore, a combined layer of combustion carbon and lacquer, which formed the black color, was painted after the body clay was fired.

The Properties of Pusan Clay : Magnetic Susceptibility of Deltaic sediments in Gadeok-do Area (부산점토의 특성: 가덕도 지역 조간대 퇴적물의 대자율)

  • 김성욱;김인수;이선갑;김무겸;정성교
    • Proceedings of the Korean Geotechical Society Conference
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    • 2003.03a
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    • pp.747-752
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    • 2003
  • This study was carried out to understand the stratigraphy and depositional environment of clayey soils that distributed in the Gadeok-do area, Kimhae plain (Nakdong estuary). For the study, SPT core sampling and magnetic susceptibility analysis were conducted. Soils in study area is classified into five sedimentary facies ascending order; sand/gravel. clay, sand/gravel, clay, interbedded sand and silty clay. Analysis of magnetic susceptibility for Gadeok-do clayey soil reveals that depositional process and environment can be divided into upper, middle and lower layer, and they are closely related to the sea level change since late Quaternary.

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Trimeric Chromium Oxyformate Route to Chromia-Pillared Clay

  • Yun, Ju Byeong;Hwang, Seong Ho;Choe, Jin Ho
    • Bulletin of the Korean Chemical Society
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    • v.21 no.10
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    • pp.1049-1051
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    • 2000
  • A chromia-pillared clay has been prepared by ion exchange type intercalation reaction between the sodium ion in montmorillonite and the trimeric chromium oxyformate (TCF) ion, and by subsequent heat-treatment. The structural and thermal properties have been systematically studied by thermal analysis, powder XRD, IR spec-troscopy, and XAS. The gallery height of~6.8 $\AA$ upon intercalation of the TCF ion suggests that the $Cr_3O$ plane is parallel to the aluminosilicate layers. Even though the basal spacing of TCF intercalated clay decreases slightly upon heating, the layer structure was retained up to $550^{\circ}C$ as confirmed by XRD and TG/DTA. Ac-cording to the EXAFS spectroscopic analysis, it is identified that the (Cr-Cr) distance of 3.28 $\AA$ between vertex-linked CrO6 octahedra in TCF splits into 2.64 $\AA$, 2.98 $\AA$, and 3.77 $\AA$ due to the face-, edge-, and corner-shared CrO6 octahedra after heating at $400^{\circ}C$, implying that a nano-sized chromium oxide phase was stabilized within the interlayer space of clay.

Study on the Characteristics of Materials and Production Techniques of Clay Seated Vairocana Buddha Triad of Seonunsa Temple, Gochang (보물 제1752호 고창 선운사 소조비로자나삼불좌상 재질특성 및 제작기법 연구(1): 소조불상 주요 구성재료 분석)

  • Lee, Hwa Soo;Lee, Han Hyoung;Han, Gyu-Seong
    • Journal of Conservation Science
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    • v.36 no.6
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    • pp.562-577
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    • 2020
  • In this study, to conserve the clay seated Vairocana Buddha triad in Seonunsa temple, Gochang (Treasure 1752), the primary materials employed for creating the clay Buddha statues were scientifically analyzed. By analyzing the soil layer constituting the Buddha statues, it is observed that the said layer comprises sand having particle size greater than that of medium sand and soil having particle size smaller than that of fine sand, which were used in a ratio of 7:3, along with the bast fibers of paper mulberry (Broussonetia kazinoki). Hence, the aforementioned soil layer is composed of a mixture of sand and weathered soil, along with bast fibers to prevent scattering. By analyzing the tree species, it is found that the wooden materials constituting the bottom board and the interior of Buddha's sleeves of the Amitabha Buddha statue, Vairocana Buddha statue, and Medicine Buddha statue are hard pines (Pinus spp.). Additionally, three layers are found in the cross section of the gold layer. Furthermore, each of the hair sections of the Buddha statues is composed of earthy materials such as quartz, albite, microcline, mica, and magnetite, and the hair surface was painted by incorporating black materials containing magnetite.

Sedimentological Study of Littoral Beach Sand in Busan Area, South Korea (부산일원(釜山一圓) 연안해빈사(沿岸海賓砂)의 퇴적학적(堆積學的) 연구(硏究))

  • Lee, You Dae;Choi, Kwang Sun
    • Economic and Environmental Geology
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    • v.16 no.2
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    • pp.65-78
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    • 1983
  • This report deals with the sedimentological study of the littoral sand of beaches in the Busan area. The purpose of this report is to know the grain size, mineralogical composition, heavy mineral and clay mineral of the beach sands, and gravity measurements of the Nagdong River Deltas. 1) As a whole, the littoral sand of the beaches are composed of uniformly medium grained, moderately sorted and nearly symmetrical. The barrier sand of the Nagdong Estuary is composed of fine grained, well sorted and nearly symmetrical. 2) The littoral sand of the beaches is transported by saltation and rolling. The barrier sand of the Nagdong Estuary is transported by suspension and saltation. 3) In the littoral sand of the beaches, the ratio of feldspar to quartz is 1 :2.31 and in the barrier sand of the Nagdong Estuary 1:1.40. 4) The content of heavy mineral of samples ranges from 0.54 to 3.87 %. The principal heavy minerals are hornblende, pyroxene, epidote, garnet, leucoxene, zircon, apatite, magnetite, hematite and ilmenite with minor accessories of rutile and olivine. 5) The x-ray diffraction analysis of the clay mineral informs the existence of quartz, feldspar, kaolinite and montmorillonite. The montmorillonite is considered to have been derived from the alteration of acidic volcanic rocks. 6) To determine the depositional structure of the Nagdong Estuary, Gravity measurements were made. Free air anomaly ranges from 14.5 mgal to 33.5 mgal and Bouguer anomaly ranges from 14.3 to 23.5 mgal and both are closely related to the topography. According to the interpreted layer structure, the upper layer composing sand, silt and clay, the intermediate layer composing sand with gravel, the lower layer composing weathered and soft rock, and bed rock composing hornfels or andesite. 7) The depositional environments of the study, the littoral area is dominated by the marine environment and the Nagdong Estuary by the mixed environment.

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