• 한국염색가공학회지
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• 제34권2호
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• pp.109-116
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• 2022

Tire codes are made of materials such as hemp, cotton, rayon, nylon, steel, polyester, glass, and aramid are fiber reinforcement materials that go inside rubber to increase durability, driveability, and stability of vehicle tires. The reinforcement of the tire cord may construct a composite material using tires such as automobiles, trucks, aircraft, bicycles, and fibrous materials such as electric belts and hoses as reinforcement materials. Therefore, it is essential to ensure that the adhesive force between the rubber and the reinforced fiber exhibits the desired physical properties in the rubber composite material made of a rubber matrix with reinforced fibers. This study is a study on the heat treatment conditions for improving the adhesion strength of the tire cord and the reinforced fiber for tires. The core technology of the drying process is a uniform drying technology, which has a great influence on the quality of the reinforcement. Therefore, the uniform airflow distribution is determined by the geometry and operating conditions of the dryer. Therefore, this study carried out a numerical analysis of the shape of a drying nozzle for improving the performance of hot air drying in a dryer used for drying the coated reinforced fibers. In addition, the flow characteristics were examined through numerical analysis of the study on the change in the shape of the chamber affecting drying.

• 타이어
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• 통권111호
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• pp.20-29
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• 1984

유한요소법에 의하여 축대칭 정적하중을 받는 승용차용 래디알 타이어의 변형을 해석하였다. 요소는 8절점 parabolic-isoparametric 요소를 사용하였으며 타이어를 구성하는 cord-rubber복합체를 선형직교성을 갖는다고 가정하고, 그 복합체의 물성치를 간단한 식으로 표시하여 적용하였다. 공기압으로 인해 변형된 모양 및 cord에 작용하는 장력을 계산해 냈으며 이 변형된 모양을 plaster cast를 이용하여 측정한 실험치와 비교하였다. 또 타이어를 구성하는 구조가 달라지면 공기압으로 인하여 변형형태가 어떻게 변화하는가를 계산해 보았다. 이 결과로 belt의 cord수가 감소하거나 belt cord angle이 증가하면 타이어 외경이 증가함을 알 수 있다.

• 대한기계학회논문집A
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• 제31권7호
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• pp.725-731
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• 2007

An air spring which is a part of the suspension system of automobiles is used to reduce and absorb the vibration and the noise. Main components of the air spring are a cord reinforced rubber bellows, a canister and a piston. The performance of the air spring are depended on configurations of rubber bellows, the angle and elastic modulus of cord. The finite element analysis are executed to predict and evaluate the load capacity and the stiffness. The design variables of air spring are determined to adjust the required specifications of the air spring. Several samples of the air spring are manufactured and experimented. It is shown that the results by finite element analysis are in close agreement with the test results.

• 공업화학
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• 제5권6호
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• pp.1056-1061
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• 1994

$80^{\circ}C$에서 열처리하거나, $80^{\circ}C$와 상대습도 85%인 습도 조건에서 처리한 황동이 피복된 강선 코드의 표면 상태와 고무와 접착 성질을 조사하였다. 열처리로 황동의 산화가 진행되었으며, 습윤처리 후에는 더 심하게 산화되었다. 처리기간이 길어질수록 전처리한 코드의 접착 성질이 나빠졌으며, 고무부착 정도가 심하게 저하되었다. 황동 피복층의 산화로 인한 코드의 접착 성질 저하를 산화아연층의 과도한 성장과 연계지어 설명하였다.

• 전기학회논문지
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• 제57권7호
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• pp.1298-1303
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• 2008

Respiration is induced by muscular contraction of the chest and abdomen, resulting in the abdominal volume change. Thus, continuous measurement of the abdominal dimension enables to monitor breathing activity. Conductive rubber cord has been previously introduced and tested to develop wearable application for respiratory measurements. This study implemented respiratory monitoring system with the conductive rubber cord in the patient's pants in purpose of quantitative estimation of tidal volume. Air mixed with $0{\sim}5%$ $CO_2$ was inhaled and the respiratory air flow rate, abdominal dimension change, and end tidal $CO_2$ concentration were simultaneously measured in steady state. $CO_2$ inhalation significantly increased the tidal volume in normal physiological state with the subject unawared. The tidal volume estimated from the abdominal dimension change linearly correlated with the tidal volume measured by a pneumotachometer with a correlation coefficient of 0.88. Customized calibration for each subject resulted in relative errors less than 10%. Therefore, the tidal volume was accurately estimated by measuring the abdominal dimension change.

• 한국염색가공학회지
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• 제11권4호
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• pp.50-56
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• 1999

The adhesive properties of polyester cord in rubber matrix were investigated according to the surface modification. The polyester cord was oxidized in sodium hypochlorite solution, and graft-polymerized with acrylic acid under the irradiation with ultraviolet light, and then coated with resorcinol-formaldehyde latex (RFL). The modified surface was checked with scanning electron microscope. The adhesive properties were measured by the full-Out method, and evaluated with regard to the energy of adhesion and the maximum load. The polyester was not oxidized in sodium hypochlorite solution, so the surface was not able to etch to produce the coarse topology. As the concentration of acrylic acid and the reaction time were increased, the graft yields were also increased. It was considered that the acrylic acid would swell the polyester and diffuse easily to the inner side of substrate. The adhesive properties of polyeser to rubber matrix were affected by the surface condition. Namely, the maximum load was almost same, but the energy of adhesion was rather higher In the polyester grafted with acrylic acid than in control one. We concluded that the flexible aliphatic chains of polyacrylic acid situated in the interface of cord and rubber matrix were distributed well the stress and strain all over the filler resulting the high energy of adhesion.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 하계학술대회 논문집 C
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• pp.1655-1657
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• 2004

The electrical fire frequently happens through carelessness of a vinyl and rubber cords such as a poor contact, a mechanical stress and so on. Electrical fire occupies the greater part(about 30%) of all fires in Korea. In this paper, we compared to the fire dispersive patterns of vinyl and rubber cords according to the external flame in the wall-model. The fire progress and dispersive patterns were measured by a high speed imaging system(HG-100K, REDLAKE, USA). From the results, short-circuit of the vinyl cords are easy to happen than the rubber cords by the external flame. The pattern of fire was progressed a flashover, scattering and disconnection. The fire progress on the vinyl cord is not observed because the ignition energy decreases. However, the fire was progressed continuously on the rubber cord.

• Elastomers and Composites
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• 제34권3호
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• pp.253-261
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• 1999

조성이 다른 접착제를 포함한 고무혼합물의 가교특성은 접착제 조성에서 탄닌이 많이 포함될수록 스코치 시간은 증가하였으며 경화속도는 다소 감소하는 것으로 보아 탄닌 분자의 크기와 형태 때문에 초기 가교반응을 지연시킴과 동시에 경화속도 역시 다소 지연됨을 알 수 있었다. 이들 고무혼합물의 인장물성 역시 탄닌이 많이 함유된 접착제를 고무에 혼합할수록 고무혼합물의 인장강도는 다소 감소하였다. 이는 탄닌이 많이 함유될수록 가교반응을 지연시켜 전체 고무혼합물의 가교도가 감소하기 때문일 것으로 사료되었다. 또한 접착제의 조성이 고무-섬유 접착에 미치는 영향을 보강코드로서 나일론 610 모노필라멘트를 사용하여 TCAT(Tire Cord Adhesion Test) 방법으로 조사하였다. 레소시놀-탄닌-포름알데히드-라텍스(RTFL) 접착제 조성에서 레소시놀 1 mole당 포름알데히드의 mole 비가 증가할수록 접착력은 증가하였고 대략 포름알데히드 5mole 이상에서 최적의 접착력을 나타냈다. 보강코드상의 접착제 수확량(DPU) 역시 최종 접착력에 영향을 미치지만, 나일론 610 모노필라멘트의 경우는 접착제 조성에 따른 DPU가 거의 일정하여 접착력의 차이는 접착제의 조성 중 탄닌의 거동 때문으로 해석될 수 있었다.

• 한국정밀공학회지
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• 제28권3호
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• pp.357-362
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• 2011

Air springs are prevalently used as suspension in train. However, air springs are seldom used in automobiles where they improve stability and comfort by enhancing the impact-relief, breaking, and cornering performance. Thus, this study proposed a new method to analyze air springs and obtained some reliable design parameter which can be utilized in vehicle suspension system in contrast to conventional method. Among air spring types of suspension, this study focused on sleeve type of air spring as an analysis model since it has potential for ameliorating the quality of automobiles, specifically in its stability and comfort improvement by decreasing the shock through rubber sleeve. As a methodology, this study used MARC, as a nonlinear finite element analysis program, in order to find out maximum stress and maximum strain depending on reinforcement cord's angle variation in sleeves. The properties were found through uniaxial tension and pure shear test, and they were developed using Ogden Foam which is an input program of MARC. As a result, the internal maximum stresses and deformation according to the changes of cord angle are obtained. Also, the results showed that the Young's modulus becomes smaller, then maximum stresses decrease. It is believed that these studies can be contributed in automobile suspension system.

• 타이어
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• 통권31호
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• pp.11-15
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• 1971

이 글은 1970년 10월호 Rubber world 지에서 발행 번역한 것임