• Title/Summary/Keyword: adhesive characteristics

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The Quality Characteristics of Dress Shoe Adhesives -Men's Leather-Shoe- (정장용 구두 접착제의 품질특성 -남성 가죽구두-)

  • 이종철;이종석;양대용
    • Journal of the Korea Society of Computer and Information
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    • v.6 no.3
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    • pp.131-136
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    • 2001
  • Men's dress shoe was made from Steer-finished leather manufactured by this study. Men's dress shoe applied by the cementing method in KS G 3116 and used by the chloroprene adhesive has been evaluated. For the qualify test of adhesive for Oxford using chloroprene adhesive, duration for environmental exposure was tested. Also, the quality test result of chloroprene adhesive, which had been applied to men's dress shoe as well as ladies' dress shoe, was better than expected. In case of adhesion-strength measurement. the KS G 3116 method of peel strength at the end of toe was found to be resonable compared to our measurement method through toe to heel seat on feather edge.

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Light and electron microscopic morphology of the fertilized egg and fertilized egg envelope of Poropanchax normani, Poeciliidae, Teleostei

  • Dong Heui Kim
    • Applied Microscopy
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    • v.52
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    • pp.6.1-6.5
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    • 2022
  • We examined the morphology of the fertilized egg and the fine structure of fertilized egg envelopes of Poropanchax normani belonging to the family Poeciliidae, also known as Norman's lampeye using light and electron microscopes. The fertilized eggs with narrow perivitelline space were found to be spherical and demersal, additionally containing small oil droplets in the vitelline membrane. Further, a bundle of adhesive filaments was observed to be present on one side of the fertilized egg. These filaments possessed remarkably high elasticity and were approximately 1-3mm in length. The size of the fertilized egg was determined to be about 1.49 ± 0.07mm (n=30). The outer surface appeared smooth, and adhesive filaments originating at different location of the surface of the envelope were found to be distributed around the egg envelope and were joined together to form a single long bundle in scanning electron microscopic observation. A peak-like structure formed of several straight wrinkles was observed around the micropyle. However, the complete structure of the micropyle could not be studied due to the depth at which it was located. Additionally, the total thickness of the egg envelope was ascertained to be approximately12.5-14.5㎛. The egg envelope consisted of two distinct layers, an outer electron dense layer and an inner lamellar layer, further consisting of 10 sublayers of varying thicknesses. Collectively, it was observed that the morphological characteristics of the fertilized egg, fine structures surrounding the micropyle, outer surface, adhesive structure consisting adhesive filaments, and sections of fertilized egg envelope displayed species specificity.

A study on tensile shear characteristics for weld-bonded 1.2GPa grade TRIP steels with changes in nugget diameter for automotive body application (자동차 차체용 1.2GPa급 TRIP 강의 Weld-bond부 너깃경에 따른 인장전단특성에 관한 연구)

  • Choi, Ildong;Park, Jiyoun;Kim, Jae-Won;Kang, Mun-Jin;Kim, Dong-Cheol;Kim, Jun-Ki;Park, Yeong-Do
    • Journal of Welding and Joining
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    • v.33 no.2
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    • pp.69-77
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    • 2015
  • High strength steels have been continually being developed to improve in fuel economy in automotive and ensure safety of passengers. New bonding and welding methods have been required for improving weldability on high strength steels. In this study, resistance spot welding and Weld-bond with nugget diameters of 4.0mm, 5.0mm, 6.0mm and 7.0mm were produced and tested, respectively. In order to confirm the effect of nugget diameters on tensile shear characteristic of the Weld-bond, tensile shear characteristics of Weld-bond were compared with those of resistance spot welding and adhesive bonding. Peak load of Weld-bond were increased as the nugget diameter increases. After appearing maximum peak load continuous fracture followed with second peak owing to load being carried by resistance spot weldment. Fracture modes of the adhesive layer in Weld-bond fractures were represented by mixed fracture mode, which are cohesive failure on adhesive part and button failure at resistance spot welds. The results showed that the tensile shear properties can be improved by applying Weld-bond on TRIP steel, and more apparent with nugget diameter higher than 5${\surd}$t.

A Study on Tensile Shear Characteristics of Dissimilar Joining Between Pre-coated Automotive Metal Sheets and Galvanized Steels with the Self-Piercing Rivet and Hybrid Joining (Self-Piercing Rivet과 Hybrid Joining을 이용한 자동차용 선도장 칼라강판과 용융아연도금강판의 접합부 기계적 성질 평가)

  • Bae, Jin-Hee;Kim, Jae-Won;Choi, Ildong;Nam, Dae-Geun;Kim, Jun-Ki;Park, Yeong-Do
    • Journal of Welding and Joining
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    • v.34 no.1
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    • pp.59-67
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    • 2016
  • The automotive manufactures increase their use of lightweight materials to improve fuel economy and energy usage has a significant influence on the choice of developing materials. To meet this requirements manufacturers are replacing individual body parts with lightweight metals, for these the process treating and painting surfaces is changing. The pre-coated steels are newly developed to avoid the conventional complex and non-environmental painting process in the body-in-white car manufacturing. The development of new joining techniques is critically needed for pre-coated steel sheets, which are electrically non-conductive materials. In the present study, dissimilar combination of pre-coated steel and galvanized steel sheets were joined by the self-piercing rivet, adhesive bonding and hybrid joining techniques. The tensile shear test and free falling high speed crash test were conducted to evaluate the mechanical properties of the joints. The highest tensile peak load with large deformation was observed for the hybrid joining process which has attained 48% higher than the self-piercing rivet. Moreover, the hybrid and adhesive joints were observed better strain energy compared to self-piercing rivet. The fractography analyses were revealed that the mixed mode of cohesive and interfacial fracture for both the hybrid and adhesive bonding joints.

Joining Technology of Flat Panel Photobioreactor Case (평판형 광생물반응기 케이스 접합 기술)

  • Ahn, Dong-Gyu;Lee, Ho Jin;Ahn, Yeong-Su
    • Journal of the Korean Society for Precision Engineering
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    • v.30 no.2
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    • pp.154-163
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    • 2013
  • Adhesive bonding and plastic welding have been widely used to join two plastic materials together. The goal of this paper is to determine a proper joining technology of a pair of flat panel (FP) photobioreactor (PBR) case. The material of the FP PBR case is polycarbonate (PC) plate. Two types of adhesion, including acryl adhesive and two-part epoxy adhesive, as well as two types of plastic welding technology, including ultrasonic welding and thermal welding, are employed for joining of PC plates. In order to influence of the adhesion and welding conditions on the joining characteristics of the PC plates in operational conditions of the FP PBR case, the morphology in the vicinity of the joined region as well as the water and pressure resistance characteristic are investigated. In addition, the variation of the bonding strength of the joined region and deformation behaviors in the vicinity of the joined region according to the adhesion and welding conditions is examined via the lap-shear test. From the results of basic experiments, proper joining technologies are chosen. Using the chosen joining technologies, the FP PBR case are fabricated to perform full-scale durability experiment. The results of the full-scale durability experiment have been shown that the chosen joining technologies can be applicable to fabricate the FP PBR case.

Morphological and Phylogenetic Characteristics of Nematophagous Fungi (식물기생성 선충 포식곰팡이의 형태 및 계통분류학적 특성)

  • Kang, Doo-Sun;Jeon, Han-Ki;Son, Hee-Seong;Whang, Kyung-Sook;Cho, Cheon-Whi
    • Applied Biological Chemistry
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    • v.50 no.2
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    • pp.101-106
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    • 2007
  • Twenty-two strains of nematophagous fungi were isolated from 100 soil samples. Nematophagous fungi were classified into three categories; 3-dimensional adhesive nets (A group), 2-dimensional adhesive nets (B group) and constricting ring (C group). Nine strains were selected and identified on the basis of morphological characteristics (hypha, conidiophore, form and size of conidia, number of conidia, node of conidophore, number and location of septa, size and color of chlamydospore) and ITS (internal transcribed spacer) region of rDNA sequences. As the results, the isolated were identified as belonging to the species of Monacrosporium thaumasium (Kan-2, Kan-4, Kan-11), Arthrobotrys oligospora (Kan-9, Kan-13, Kan-20, Kan-21), A. musiformis (Kan-12), and A. dactyloides (Kan-22).

Study of Characteristics for Red Adhesive in Traditional Gold Thread (전통 편금사에 사용된 붉은 접착제 특성 연구)

  • Kim, Ji Eun;Yu, Ji A;Han, Ye Bin;Chung, Yong Jae
    • Journal of Conservation Science
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    • v.32 no.1
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    • pp.43-49
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    • 2016
  • Gold threads mean thread made by metal, it is composed various material to gold leaf, adhesive and media. The making technique and using materials of Gold threads are different from region, it can be used to distinguish country of origin. So this study finds characteristics and making techniques for flat gold threads of relics. Standard samples are made of animal glue, lacquer, red lacquer and etc. This materials are based on the scientific investigation of cultural gold threads properties. Then traditional techniques were estimated by comparison and analysis of actual cultural properties and standard samples. As a result of investigating cultural properties, it is similar to the standard sample which are mixed with red soil additives. After analysis of SEM-EDS, it is detected to Al, Si, Fe. So it is to the conclusion that traditional gold thread is made of adhesive mixed with red soil to improve gold color better. And this ways are similar with china that uses animal glue and red soil to adhesive and different from japan that uses lacquer to adhesive. Through this study, it will be used to data and reference for reappearance and making techniques of traditional gold threads.

The Effect of Oxide Layer Formed on TiN Coated Ball and Steel Disk on Friction Characteristics in Various Sliding Conditions (미끄럼조건에 따라 TiN 코팅볼과 스틸디스크에 형성되는 산화막이 마찰특성에 미치는 영향)

  • 조정우;이영제
    • Tribology and Lubricants
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    • v.17 no.6
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    • pp.459-466
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    • 2001
  • In this study, the effects of oxide layer formed on the contact parts of TiN coated ball and steel disk on friction characteristics in various sliding conditions were investigated. AISI52100 steel ball was used for the substrate of coated ball specimens, which were prepared by depositing TiN coating with 1(m in coating thickness. AISI1045 steel was used for the disk type counter-body. To investigate the effect of oxide layer on the contact parts of two materials, the tests were performed both in air for forming oxide layer on the contact parts and in nitrogen environment to avoid oxidation. From the test results, the frictional characteristic between the two materials was predominated by iron oxide layer that formed on wear tract of counter-body and this layer caused friction transition and high friction. And the adhesive wear occurred from steel disk to TiN coated ball caused the formation of oxide layer on counter parts between the two materials.

Changes of Mechanical Properties of Wool Fabrics with Fusible Interlinings (모직물의 접착심지 접착에 의한 물성 변화)

  • 지주완;유효주
    • Journal of the Korean Society of Clothing and Textiles
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    • v.19 no.4
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    • pp.671-683
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    • 1995
  • This paper described the changes of mechanical KES values after fusing 4 different (in weave & density) wool face fabrics with 3 different (in weave & extensibility) fusible interlining. The fusing condition was 15$0^{\circ}C$, 4kg.f/cm2 The results of the study were as follows: (1) After fusing, KES mechanical value of B, 2HB, G, 2HGS, WC increased, where as LT, WT werent't changed so much and EM, RT decreased. It means after fusing extensibility and recovery property were decreased and volume and stiffness were increased. (2) Within the limits of this investigation, tensile property seemed to be more influenced by the characteristics of face fabrics, and bending property nil by the effect of adhesive penetration and shear and compression property did by complex of the characteristics of face fabrics and interlining and the effect of adhesive penetration.

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Strengthening Performance and Failure Characteristics of Reinforced Concrete Beams Exposed to Freezing-and-thawing Cycles after Shear Strengthening with CFRP Plate (CFRP 판으로 전단 보강된 이후 동결융해에 노출된 철근콘크리트 보의 보강성능 및 파괴특성)

  • Yun, Hyun-Do;Kim, Sun-Woo;Jeon, Esther;Lee, Min-Jung
    • 한국방재학회:학술대회논문집
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    • 2008.02a
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    • pp.457-460
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    • 2008
  • CFRP plates has been established as an effective method for rehabilitation and strengthening of concrete structures. The CFRP reinforcements are bonded to beams and slabs using structural adhesives. Adhesive strength can be affected by environmental exposure. During freezing-and-thawing cycling, temperature-induced stresses in the adhesive layer, due to differential thermal expansion between the CFRP and the substrate concrete, may lead to bond damage and contribute to or cause premature CFRP composite separation. This paper presents the results of experimental program undertaken to investigate the effects of freeze-thaw cycling (from -18 to $4^{\circ}C$) on the behavior and failure characteristics of RC beams strengthened in shear with CFRP plate using acoustic emission (AE) technique.

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