• Title/Summary/Keyword: Microcellular plastics

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Impact Strength as Foaming Magnitude of Microcellular Foamed Plastics (초미세 발포 플라스틱의 공극률에 따른 충격 강도)

  • 황윤동;차성운;김철진
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2001.04a
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    • pp.341-345
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    • 2001
  • New technoloty called microcellular foaming process was developed at MIT in 1980's. Although it has many good things, it could not be used it all sides of manufacturing plastics. Because it takes a long time for making foamed goods. So microcellular foaming injection molding process appeared to solve this problem. The first purpose of this research is to measure the impact strength as foaming magnitude of microcellular foamed plastics. There are two methods such as batch process and microcellular foaming injection molding process in making foamed plastics. According to the experimental data, the impact strength of each specimen was measured to find out the influence of foaming magnitude of microcellular foamed plastics.

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A Study on Acoustical Characteristics in Microcellular Foaming Plastics (초미세 발포 플라스틱의 음향특성 연구)

  • Cha, Sung-Woon;Kim, Hak-Bin;Lee, Byoung-Hee;Kang, Yon-Jun
    • Journal of the Korean Society for Precision Engineering
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    • v.25 no.9
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    • pp.71-77
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    • 2008
  • 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.

Weight Change of Microcellular Plastics by Using nitrogen Gas (질소 가스를 이용한 초미세 발포 고분자 재료의 무게변화)

  • Jeing, Dae-Jin;Cha, Sung-Woon;Yoon, Jae-Dong
    • Journal of the Korean Society for Precision Engineering
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    • v.17 no.9
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    • pp.196-201
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    • 2000
  • There is a great demand for reducing the amount of material used in mass-produced plastics parts for material cost constitutes a large percentage of the total cost of a product up to 75% It may be noted that the price of plastics is directly related to the price of petroleum. Material reduction therefore decreases the amount of oil needed for the manufacture of plastics and thus help conserve this natural resource. Therefore microcellular foaming process(MCPs) was studied for solving this problems alternatively in 1980's at M. I. T. Until now in microcellular plastics processes carbon dioxide gas was mainly used for microcellular foaming Because carbon dioxide has more solubility than any other gases such as nitrogen gas or helium gas. The purpose of the this research is measurement of changing of the microcellular plastics' weight by using nitrogen gas in injection molding an comparing weight reduction of microcellular foamed plastics for using carbon dioxide gas with nitrogen gas.

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공리적 설계를 이용한 초미세 발포 공정 설계

  • Jeong, Dae-Jin;Cha, Sung-Woon;Yoon, Jae-Dong
    • Journal of the Korean Society for Precision Engineering
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    • v.18 no.1
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    • pp.195-200
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    • 2001
  • There is a great demand for reducing the amount of material used in mass-produced plastics parts, for material cost constitutes up to 75% of the total production cost. Plastics do not easily decay which causes environmental problem. Furthermore, material reduction therefore decreases the amount of oil needed for the manufacture of plastics and thus help conserve this natural resource. Therefore, microcellular foamed plastics(MCPs) was developed at MIT to solve these problem alternation 1980's. Until now, however, microcellular foaming process not designed systematically because the key factors governing the process were not clear. The goal of this research is to obtain the optimal design of the microcellular plastics by using axiomatic approach.

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A Change of Strength at Microcellular Foamed Plastics as Content of Glass Fiber (GLASS FIBER의 함유량에 따른 초미세 발포 플라스틱의 강도 변화)

  • 김보흥;차성운;황윤동
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2001.04a
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    • pp.335-340
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    • 2001
  • We use so many plastic products in everyday. Because polymer materials have a lot of merits including low cost and easiness of forming, they are widely used in many manufacturing industries. Microcellular foaming process was developed at MIT in 1980's to save a quantity of materials and increase mechanical properties. The improvement of strength is very important factor in relation with the reduction of mass. So the first purpose of this research is to improve the strength of the microcellular foamed plastics as variation of glass-fiber's volume friction. Also the characteristic of filler such as glass-fiber was presented in a microcellular foaming process.

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Effect of Gas amount on Viscosity Change in Microcellular Plastics (가스의 주입량에 따른 초미세 발포플라스틱의 점도 변화)

  • Lee, Jung-Joo;Cha, Sung-Woon;Kim, Seung-Young
    • Proceedings of the KSME Conference
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    • 2004.04a
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    • pp.1114-1119
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    • 2004
  • In a foaming process of microcellular plastics (MCPs) with a injection molding, research on the viscosity change that occurs when the gas is injected to the polymer has received little attention despite its importance. The purpose of this paper is to provide the basic data required to determine the processing condition by measuring viscosity changes against the gas injection rates of the blowing agent, and to verify the influence of the viscosity change on the flow condition of polymer inside the mold at the injection process.

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The Effect of Gas Absorption Induced a Change of Glass Transition Temperature in Microcellular Foamed Plastics (초미세 발포 플라스틱의 유리전이온도를 변화시키는 가스 용해량의 영향)

  • Hwang, Yun-Dong;Cha, Seong-Un
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.25 no.5
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    • pp.816-822
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    • 2001
  • The thermoforming process is widely used in the plastics industry to produce articles for the packaging, automotive, domestic construction and leisure industries. The microcellular foaming process appeared at M.I.T. in 1980s to save a quantity of polymer materials and increase their mechanical properties. The glass transition temperature of polymer materials is one of many important process variables in appling the microcellular foaming process to the conventional thermoforming process. The goal of this research is to evaluate the relation between gas absorption and glass transition temperature in batch process using microcellular foaming process. The weight gain ratio of polymer materials has a conception of gas absorption. Polymers such as acrylonitrile-butadiene-styrene(ABS), polystyrene(PS) have been used in this experiment. According to conventional Chows model and Cha-Yoon model, it was estimated with real experimental result to predict a change of glass transition temperature as a function of the weight gain ratio of polymer materials in batch process to gain microcellular foamed plastic products.

The Foaming Characteristics of Microcellular Processing with Polypropylene in Semicrystalline States (결정성 수지의 발포특성)

  • Lee, Bo-Hyoung;Cha, Sung-Woon;Yoon, Jae-Dong
    • Proceedings of the KSME Conference
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    • 2003.11a
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    • pp.1828-1833
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    • 2003
  • In a foaming process of microcellular plastics (MCPs) with a batch process, amorphous plastics and crystalline plastics have different characteristics for a foaming temperature. It is known that a foaming of amorphous plastics occurs at the temperature above a glass transition temperature, however, it is discovered that crystalline plastics do not take place above a glass transition temperature without exception, and even though the foaming occurs, it does not in all the range. In this research, to measure foaming temperature of crystalline polymer, a foaming experiment was performed using one of the typical crystalline polymer, polypropylene. To analyze whether the foaming occurs both at amorphous and crystalline fields, SEM was applied

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