단판 적층성형 학생용 책상.의자의 제조적성

서진석,박종영,한기만,Suh, Jin-Suk,Park, Jong-Young,Han, Ki-Man 한국가구학회 2005 한국가구학회지 Vol.16 No.2

As physical condition of students improves, there is a need to develop human body-friendly desk and chair for students. In this study, desks and chairs were manufactured with curved veneer lamination under high frequency heating and pressing, using ten wood species such as Japanese red pine, Korean pine, pitch pine, Japanese larch, yellow poplar, black locust, oak, radiata pine, beech, and birch. The performance of these products were evaluated. The results obtained were summarized as follows; With high frequency heating, the turned lamination of veneers with full size sheet ($3{\times}6\;feet$) prepared by rotary lathe peeling was successfully applied for making the members of desk top, leg frames of desk and chair. Bending strengths of desk tops were relatively greater for yellow poplar, black locust and red pine, which were similar to those of beech and birch. Bending strengths of desk legs were classified into greater species group (red pine, yellow poplar, larch) and lower species group (radiata pine, Korean pine, pitch pine). Compressive strengths of chair legs in parallel direction to the lamination were greater in black locust and larch. On the other hand, differences between outer and inner gap at the top and drawer bottom of desk top were rather larger for the laminations of birch and beech, and less for those of yellow poplar and pitch pine, showing greater stability of open drawer space. In results, yellow poplar, larch, pitch pine and red pine showed good appearance and strength properties at the curved veneer lamination. Accordingly, it was believed that these domestic woods were able to substitute for birch which was being imported for the use of veneer-laminates type furniture.

壓縮法 및 CO2가스注入法에 의한 落葉松 파티클 混入 세멘트 보드의 性質

서진석(Jin Suk Suh),Maeuli H.Simatupang(Maruli H. Simatrupang) 한국가구학회 1995 한국가구학회지 Vol.6 No.1

本 硏究에서는 木質·세멘트 複合보드 製造時 硬化障害를 일으키는 樹種으로 認識되어 온 落葉松에 대해 速硬化體系로 考案된 CO2 가스注入(嘴射)法을 適用하여 木材파티클·세멘트보드를 製造하고, 通常 壓縮法으로 製造한 보드와 物理 및 機械的 性質을 比較함으로써 그 製造適性을 살펴보고자 하였다 .<br/> 세멘트에 混入하는 木質試料는, 獨逸産 落葉松 (Larix decidua), 韓國産 落葉松 (Larix leptolepis ), 그리 고 獨逸産 가문비나무(Picea abies) 파티클 및 新聞古紙解離 纖維를 使用하였다 .<br/> 먼저, 韓國産 落葉松파티클·세멘트보드 製造時 , 壓縮法을 適用하여 添加劑의 種類와 添加率(또는代替率)의 影響을 究明하였으며, CO2 가스注入法을 適用하여 파티클 類型(形態와 치수)에 關聯한 層構成, 樹種(獨逸産가문비나무 包含) 의 影響을 究明하였다. 또한, 獨逸産 落葉松파티클에 대하여, CO2가스 注入法을 適用하여 세멘트의 種類(等級), 물 : 세멘트의 比率, 파티클 形態와 관련한 層構成 및 보드의 豫定密度를 달리 한 보드를 製造하고 그 性質을 究明하였다.<br/> CO2 가스住入法을 適用함으로써, 通常 壓縮法에 比하여 보드의 휨彈度 , 剝離抵抗 및 치수安定性이 改善되었고, 均一한 보드의 密度斷面이 이루어졌으며, 보드의 低含水率化 現象이 나타났다. 보드의 機械的 性質(휨彈度·剝離批抗)은 대체로 물·세멘트의 比率 0.3, 0.2, 0.4 의 順으로 크게 나타났고, 치수 安定性(두께膨脹率 및 吸水率 )은 同比率 0.3, 0.4, 0.2 順으로 良好하였다 .<br/> 浸水誠驗에 있어, 2時間 以內의 初期時間帶에 水分吸收가 많이 일어났으며, 보드密度가 增加함에 따라 吸水率은 相當히 低下되었다. 그리고, 落葉松 파티클 混入 세멘트보드는 가문비나무 파티클 混入 세멘트보드와 同等水準의 機械的 性質을 갖추었고, 치수安定性은 多少 優位를 나타냈다.

國産 및 外國産 木材파티클 結合에 의한 石膏複合體의 剪斷·휨强度的 性質

서진석(Jin Suk Suh) 한국가구학회 1993 한국가구학회지 Vol.4 No.1

In this study, the compatibility of sawdusts and bark particles prepared from 6 Korean species: pitch pine, Korean pine, Larch,acacia, Italy poplar and oak, and fine chip particles prepared from Malaysian oil palm(fermented or nonfermented)as well sqwdust particles of German spruce on the wood-gypsum composites for shear strength was examined with the addition of hardening retardant(Retardan P). In addition, the actual board thickness, the board density and the bending strength on the gymsum bonded-German larch(Larix decidua)particleboard were studied according to the addition levels of hardening retardant.<br/> The results obtained in this study were as follows; <br/> 1. It is possilble to classify the composites combined with sawdusts into 3shear strength groups according to the addition levels of hardening retardant up to 0.02%, Korean pine and larch belonged to the strength increasing group, Pitch pine, Italy poplar, oak, non-fermanted oil palm and spruce belonged to the strength decreasing group. Acasia and femented oil palm didn't show any strength decrease at the addition of 0.01%, but showed a dlight strength decrease atthe addition of 0.02%.<br/> 2. Bending strength of the 3layer gypsum bonded-larch particleboard showed a decreasing trend. which might be caused by the decrease of board density from the poor thickness control due to a precure, at the addiction of less than 0.04% of hardening retardant. In the range of addition levels of 0 to 0.08% of hardening retardant, the highedt bending strength was shown at the addition df 0.04%. <br/>

천연염색ㆍ도장처리 단판의 내변퇴색시험에 따른 색차특성

서진석(Jin-Suk Suh),김종인(Jong-In Kim),김소라(So-Ra Kim),박령재(Ryeong-Jae Park),박상범(Sang-Bum Park) 한국가구학회 2013 한국가구학회지 Vol.24 No.4

In order to evaluate a feasibility of industrial art use of veneer such as cylindrical laminated veneer lumber, the veneers of 4 species of Korean pine, radiata pine, yellow poplar and Japanese cypress were natural dye-colored and clear finished. Natural dyes were red color originated from sappanwood, blue color from polygonum indigo, and yellow color from Amur cork tree and gardenia. the clear coats of crack seal clear and UV protection oil were applied on the dyed veneer. The dyeing and finishing characteristics through fading test were summarized as follows; In non-dyed and non-finished Korean pine veneer, lightness was decreased and yellow and red hues increased after fading test. In natural dyed- and finished- veneer, color difference of gardenia-mixed Amur cork tree was generally highest, and that of polygonum indigo was lowest. Compared to non-treatment of veneers of Korean pine and yellow poplar, color difference decreasing effect by finishing was shown in crack seal clear and UV protection oil. In addition, UV protection oil was more favorable than crack seal clear with more decreased color difference. In result, maximum values of color difference after fading for 8 days were recorded about 16 to 20, which are remarked ‘very much’ of 12.1 or more when reviewing with ‘National bureau of standards unit in USA’.

Characteristics of Color Differences of Rainbow-Colored Veneers by Fading Test

Jin Suk Suh(서진석),Sang Bum Park,Jong In Kim,Ryeong Jae Park,Young Hee Cho 한국가구학회 2015 한국가구학회지 Vol.26 No.4

Natural dyeing is considered to be an alternative to chemical staining in terms of harmful VOC-free and environmentally-friendly ingredient. This study was concerned with an evaluation of color performance of naturally dyed- and painted veneer for cylindrical laminated veneer lumber etc. according to the used condition in terms of existence of light and heat in drying. From the results, the color changes by the color of dyed veneer and the type of paint are likely to be affected by fading condition of light or heat. In the future, long-term outdoor exposure test needs to be additionally followed in order to evaluate durable usability of colored veneers.

OSB 대체용 국내산 합판의 못 접합부 전단내력 성능

서진석 ( Jin Suk Suh ),황성욱 ( Sung Wook Hwang ),황권환 ( Kweon Hwan Hwang ),정기영 ( Gi Young Jeong ),정하현 ( Ha Hyun Joung ) 한국목재공학회 2012 목재공학 Vol.40 No.4

본 연구에서는 현재 국내 목조건축에서 벽구성 재료로 많이 사용되고 있는 수입 OSB(배향성 스트랜드보드)를 국산 합판으로 대체하기 위해 OSB와 국산 합판의 못 접합부 전단성능을 비교·검토하였다. 주부재(잣나무)와 측면부재(OSB·합판)의 섬유 방향성(평행·직각)에 따른 전단성능은 합판에서 현저하였다. 결과, OSB와 합판 모두 현행 국내 기준인 못 접합부 기준 허용전단내력을 만족하는 것으로 나타났다. 그리고, 표면층에 MLH(열대산 활잡목)를 사용하고 7ply 구성한 합판(P-4 type)은 OSB보다 섬유방향에 관계없이 큰 전단성능을 나타냈다. 전반적으로 측면부재로서 합판을 사용할 경우 주부재에 대하여 섬유방향을 직교되도록 구성할 경우,평행방향 구성보다 큰 전단성능을 발휘할 수 있음이 확인되었다. This study was carried out in order to compare nail shear strength between domestic plywood and imported OSB for structural sheathing members as infill wall of wooden construction. The differences of nail shear strength between parallel-to-grain direction and perpendicular-to-grain direction of sheathing material to frame material were distinct at the plywood composition. The shear strengths of plywood and OSB with nail met current design values. The plywood of P-4 type, which uses MLH at surface layer and constructs 7 ply, showed greater than OSB regardless of grain direction of sheathing material to frame material. When the plywood as sheathing material to frame material was used, it was found out that the overall construction of perpendicular-to-grain direction of plywood had greater nail shear strengths than the construction of parallel-to-grain.

원통형 단판적층재의 접착성 및 도장처리에 따른 표면내구성

서진석 ( Jin Suk Suh ),김종인 ( Jong In Kim ),황성옥 ( Sung Wook Hwang ),박상범 ( Sang Bum Park ) 한국목재공학회 2012 목재공학 Vol.40 No.6

원통형 단판적층재(LVL)의 구조재 이외의 공예재 등의 용도개발을 위하여 원통형 단판적층재의 내수접착성과 도장처리에 따른 내마모성 및 표면경도를 측정하였다. 레조시놀 수지와 경화제(paraformaldehyde)를 100 : 5의 혼합비로 하여 접착·경화한 원통형 단판적층재의 전체적인 접착층에 대한 삶음박리 접착력은 양호한 편이었다. 내마모성은 횡단면이 접선단면보다 상대적으로 우수하였으며, 접선단면에 자외선 차단 오일을 도장 처리한 경우 내마모성이 향상되었다. 표면경도는 횡단면의 경우, 낙엽송 중심재가 라디에타소나무 단판적층 부위보다 높았고, 접선단면의 경우에는 접착층 부위가 단판부위보다 높게 나타났다. In order to develop the end use of cylindrical laminated veneer lumber LVL) such as wooden crafts, the water proof-bonding strength, the resistance to abrasion and the surface hardness by painting the surface of LVL were investigated. The study results were as follows: The water proof-bonding strength through 5 cyclic test by boiling in water immersion and drying were favorable without delamination of glue line. Then the formulation of glue was resorcinol resin (100) to hardener of paraformaldehyde(5)by mixed weight percentage. The resistance to abrasion was relatively higher at cross section than tangential section. When tangential section of LVL was painted by UV protection oil, the resistance to abrasion was improved. In case of a cross section of LVL, the higher surface hardness appeared at larch core than radiate pine LVL. Also, in case of a tangential section of LVL, the higher surface hardness appeared at glue line veneer side.

라디에타소나무 단판적층재의 밀도,접착,강도성능 및 내부후성

서진석 ( Jin Suk Suh ),이동흡 ( Dong Heub Lee ),황원중 ( Won Joung Hwang ),오형민 ( Hyung Min Oh ),박영란 ( Young Ran Park ),강승모 ( Sung Mo Kang ) 한국목재공학회 2011 목재공학 Vol.39 No.4

라디에타소나무 단판적층재(LVL)를 제조함에 있어서, CuAz 및 ACQ 방부처리와 비처리, 수성비닐우레탄 접착제와 페놀변성 리조시놀수지 접착제의 상온경화형 접착제를 적용함에 따른 밀도경사, 접착·강도성능 및 내부후성(방부효력)을 살펴보았다. 결과, LVL의 밀도경사에서 접착층 주변이 원추형으로 밀도가 커지는 경사패턴을 보였다. 접착성은 수성비닐우레탄 접착의 경우, 자비반복시험 후 전층이 박리되거나, 일부 층이 박리하고 할렬·틈새 현상이 일어났다. 페놀변성 리조시놀수지 접착제 접착의 경우, 자비반복시험 후 접착층의 응력이 큰데 연유한 굽음과 상하 접착층 사이의 단판의 수직할렬 현상이 있었으나, 접착층의 박리나 할렬이 거의 발견되지 않아 침지박리접착력은 높은 것으로 판단되었다. 한편, 방부효력시험에 있어서, 수성비닐우레탄 접착제로 적층한 LVL의 경우 갈색부후균에 의한 부후도가 백색부후균보다 크게 나타났다. 페놀변성 리조시놀수지 접착제로 LVL을 제조한 경우에는 갈색부후균에 의한 질량감소가 적었고, 약제를 처리하지 않더라도 그 피해가 낮았으며, 약제처리한 것은 질량감소율 0 수준을 보일 정도로 방부효력이 큰 것을 알 수 있었다. In this study, LVLs of radiata pine were fabricated with non-preservative treated veneers, CuAz treated veneers, and ACQ treated veneers, using aqueous vinyl urethane adhesive and phenol modified resorcinol resin adhesive. Then density gradient, bonding strength, bending properties and decay resistance of LVLs were evaluated. As results, the cone-shaped and higher density gradient pattern was found in layer close to glueline. After cyclic water boiled test, the LVL bonded with aqueous vinyl urethane resin adhesive was delaminated in all layers or partly delaminated including check, chasm in glueline layer. In the case of LVL bonded with phenol modified resorcinol resin adhesive, despite slight cupping due to great glueline stress and vertical check between glueline layers, it was observed that the bonding strength to delamination was higher, owing to most absence of delamination through overall glueline. On the other hand, in the decay test, mass loss by brown rot fungi was greater than white rot fungi in LVL bonded with aqueous vinyl urethane resin adhesive However, in LVL bonded with phenol modified resorcinol resin adhesive, the mass loss by brown rot fungi was slight and non-preservative treated LVL was low. The mass loss of preservative-treated LVL was 0 (zero), showing the high decay resistance effect.

간질성 폐섬유화증의 병리조직학적 검색

서진석 ( Jin Suk Suh ),함의근 ( Eui Keun Ham ) 대한결핵 및 호흡기학회 1990 Tuberculosis and Respiratory Diseases Vol.37 No.2

합판분야의 연구동향과 전개방향

서진석 ( Jin Suk Suh ) 한국목재공학회 1994 목재공학 Vol.22 No.3