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김학빈(Kim Hak Bin),차성운(Cha Sung Woon) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
Nowadays, the companies use polymer materials for many purposes for they have many advantages. The costs of these materials take up too high a proportion of the overall cost of products that use these materials as their major material. It is advantage for polymer industries to reduce these costs. The microcellular foaming process was developed in the early 1980s to solve this problem and proved to be quite successful. Microcellular foaming process uses inert gases such as CO2, N2. As these gases solve into polymer matrices, many properties are changed. Previous researcher found the characteristics of microcellular foaming process with pure gas, for example CO2, N2and so on, they did not found the characteristics of microcellular foaming process with one more gases. If one more gases inlet the resin, the characteristics of microcellular foaming process is changed very amazingly. In this paper, discuss on the characteristics of microcellular foaming process with gas cocktail about cell morphology.
김학빈(Kim Hak Bin),차성운(Cha Sung Woon),이보형(Lee Bo Hyoung) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
Microcellular foam can be developed by first saturating a polymer sample with a volatile blowing agent, followed by rapidly decreasing its solubility in the polymer. New measuring solubility system is necessary for more accurate prediction solubility because old method is not precise. Therefore in this paper, we proposed new measuring solubility system design using axiomatic design tool. An axiomatic design is very useful and powerful design method. A comparison with old studies shows this new equipment to be more efficient and precise than the ones based on weighting the gas-saturated polymer under ambient conditions.
김학빈(Kim Hak Bin),현창훈(Hyun Chang Hoon),차성운(Cha Sung Woon) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
The microcellular foaming process was developed in the early 1980s to solve industrial problem and proved to be quite successful. Microcellular foaming process uses inert gases such as CO2, N2. As these gases solve into polymer matrices, many properties are changed. In previous research, many facts of microcellular foaming process are founded its characteristics. Previous researcher found the characteristics of microcellular foaming process with general gas, for example CO2, N2 and so on. So, in this paper, discuss on the characteristics of microcellular foaming process with helium gas.
차성운(Sung Woon Cha),김학빈(Hak Bin Kim),윤재동(Jae Dong Yoon),이윤성(Yoon Sung Lee) Korean Society for Precision Engineering 2005 한국정밀공학회지 Vol.22 No.6
Nowadays, the companies use polymer materials for many purposes for they have many advantages. The costs of these materials take up too high a proportion of the overall cost of products that use these materials as their major material. It is advantage for polymer industries to reduce these costs. The microcellular foaming process was developed in the early 1980s to solve this problem and proved to be quite successful. Microcellular foaming process uses inert gases such as CO₂, N₂. As these gases solve into polymer matrices, many properties are changed. The microcellular foaming process makes the glass transition temperature of polymers to low, and diminish the residual stress of polymer matrices. Besides, the microcellular foaming process has several merits, impact strength elevation, thermal insulation, noise insulation, and raw material saving etc. In previous research, many facts of microcellular foaming process are founded its characteristics. But previous researcher found the characteristics of microcellular foaming process with pure gas, for example CO₂, N₂ and so on, they did not found the characteristics of microcellular foaming process with one more gases. If one more gases inlet the resin, the characteristics of microcellular foaming process is changed very amazingly. In this paper, discuss on the characteristics of microcellular foaming process with gas cocktail about cell morphology.
차성운(Sung Woon Cha),김학빈(Hak Bin Kim),이병희(Byoung Hee Lee),강연준(Yon Jun Kang) Korean Society for Precision Engineering 2008 한국정밀공학회지 Vol.25 No.9
Microcellular foaming plastics create a sensation at polymer industrial for lowering product costs and overcoming a lowering of mechanical intensity. Among many advantages, microcellular foaming plastics is well known to have a good acoustical properties. This research based on the experiment of sound absorption and transmission characteristics inquire into acoustical properties of microcellular foaming plastics. Difference of transmission loss of microcellular foaming plastics and solid materials was defined as cell effect. Also, cell effect is expressed by sound reflection and sound absorption. This study is expected to fundamental research to present economical, functional alternative plan for products using sound absorption and transmission materials.
전병주(Byung Joo Jeon),차성운(Sung Woon Cha),김학빈(Hak Bin Kim) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
In comparison with conventional foaming process microcellular injection molding process has advantages such as small bubble size, the removal of sink mark, scale reliability, and weight lightening. So microcellular injection molded parts are applied to electrical product and automobile part. Conventional microcellular foaming process used carbon dioxide and nitrogen as a foaming agent. And it has been never researched and applied about microcellular injection molding process using helium. In this paper, we did a microcellular injection molding process using helium based on previous research result and made samples. From this we can certificate the possibility of microcellular continuous process using helium. Helium is lighter and faster in diffusion than carbon dioxide or nitrogen so through this technique, it can be solved the problem such as spray or labeling.