• Title/Summary/Keyword: plastics

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A Study on the Separation of Mixed Waste Plastics by Trioboelectrification (마찰대전을 이용한 혼합폐플라스틱 분리에 관한 연구)

  • Lee, Jong-Ho;Shin, Jin-Hyuk;Kim, Doo-Hyun;Kim, Jang-Woo;Lee, Jae-Keun
    • Proceedings of the KSME Conference
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    • 2000.11b
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    • pp.538-543
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    • 2000
  • The purpose of this study is to develope electrostatic separation system for recycling of mixed waste plastics. The electrostatic separation system is designed and investigated the separation efficiency for separating of mixed waste plastics. Electrostatic separation system consisted of a tribocharger, separator (two electrode), collector (5 tray) and controller (positive/negative high voltage power supply). The tribocharger is a fluidized bed using tribo-electrification mechanism between particles and particles. In experimental results, the tribocharger of the fluidized bed was more effective separation efficiency. It showed the purity of $85{\sim}99\;%$ and the recovery of $80{\sim}98\;%$ from the powder of mixed plastics such as LDPE, HDPE, PP, PS, PET and PVC. Especially, In the separation experiment of Polyvinylchloride(PVC) which generates hazardous hydrogen chloride gas in case of the combustion. its purity was over 99 % and recovery was over 95 %.

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Development of Rapid Prototyping System using High Speed Machining of Plastics (합성수지의 고속 절삭을 이용한 쾌속조형 시스템)

  • Jung, Tae-Sung;Choi, In-Hugh;Lee, Dong-Yoon;Yang, Min-Yang
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.2 no.3
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    • pp.5-12
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    • 2003
  • In order to reduce the lead-time and cost, many useful methods have been applied to rapid prototyping (RP) in recent years. But cutting process is still considered as one of the effective RP methods that have been developed and currently available in the industry. It also offers practical advantages in aspects of precision and versatility. However, traditional 3-axis NC machining has some inherent limitations such as the restriction of tool accessibility and the complex setup. In this work, a new rapid prototyping system with high speed 5-axis machining of plastics has been developed to overcome those limitations. And cutting experiments were conducted to determine the design factors of the system and the cutting conditions of plastics. The architecture of developed system is described in detail and the successful application examples are presented.

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Effect of Talc on cell density in foam processing with CO2 (Talc 함유량이 초미세 발포 셀-밀도에 미치는 영향)

  • 이보형;차성운
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2003.06a
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    • pp.1406-1409
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    • 2003
  • 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 60%. It may be noted that the price of plastics is directly rotated 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 MCPs carbon dioxide gas was mainly used for microcellular foaming. Besides, Talc was used for reducing the price of plastics. Consequently, we must certificate using the Talc in MCPs according to contents of the Talc.

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Development of the Environmental Friendly Materials Using the Waste Tires and the Waste Plastics

  • Choon Han;Kim, Hwan;Ahn, Ji-Whan;Eun, Hee-Tai
    • Proceedings of the IEEK Conference
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    • 2001.10a
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    • pp.236-239
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    • 2001
  • In this study, the compound materials of GRT/plastics (HDPE, LLDPE, LDPE, PP and PS) were developed. Their tensile strength, strain at yield and flexural modulus according to the change in CRT content were measured. And, the physical properties of the compound materials that the GRT content was changed in the waste vinyl HDPE and pure HDPE were measured, compared and analyzed. If tile GRT is added to PE plastics, the physical properties were superior to those of PP and PS, and in the case of HDPE, the waste vinyl HDPE had superior physical properties by the GRT content to the pure HDPE.

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Jig Separation of Plastic Waste Used in Copy Machines

  • Tsunekawa, Masami;Naoi, Banryu;Takubo, Tetsuo;Hirajima, Tsuyoshi;Hiroyoshi, Naoki;Otani, Masaru;Miyamoto, Masahiro;Ito, Masazumi
    • Proceedings of the IEEK Conference
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    • 2001.10a
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    • pp.592-596
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    • 2001
  • A TACUB jig was applied to separate waste plastics [polystyrene (PS), acrylonitrile butadiene styrene (ABS), and polyethylene terephthalate (PET)] used in copy machine. The effect of water pulsation including amplitude and frequency on the separation performance was investigated for the feeds containing two or three plastics. Good results are obtained under suitable conditions. Grades of 99.8% PS,99.3% ABS, and 98.6% PET are recovered as the products in the upper, middle and bottom layers respectively. Based on these results, a processing plant fer recycling of plastics from scrapped copy machines is now under construction.

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Review on Cellulose acetate as a Packaging Materials (셀룰로오스 아세테이트 포장소재의 이용 및 고찰)

  • Lee, Ji-Yoon;Jang, Si-Hun;Park, Su-Il
    • KOREAN JOURNAL OF PACKAGING SCIENCE & TECHNOLOGY
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    • v.16 no.1
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    • pp.19-25
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    • 2010
  • It is becoming increasingly important to utilize alternative raw materials for plastic industries other than petrochemical-based plastics. Cellulose derivatives were the bases of the original synthetic plastics. Cellulose and its derivatives, especially the widely used cellulose acetate (CA), constitute one of the main classes of raw materials for production on artificial fibers, films, plastics etc. CA is one of the well known polymers produced from naturally available plant substance. Many researches have focused on the isolation of cellulose from the plant cells to use them as cellulose derivatives and composite materials. Chemical and mechanical treatments provide changes on the molecular structures influencing the fundamental properties of these naturally abundant polymer. The aim of this review article is to review biodegradation, synthesis, formation, and utilization of cellulose esters, especially di-acetate, used in packaging related researches.

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A study on the machinability of Carbon Fiber Reinforced Plastics on tool shape (공구형상에 따른 CFRP(Carbon Fiber Reinforced Plastics) 복합재료의 절삭 특성에 관한 연구)

  • Shin, Bong-Cheul;Kim, Kyu-Bok;Ha, Seok-Jae;Cho, Myeong-W
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.20 no.6
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    • pp.799-804
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    • 2011
  • CFRP(Carbon Fiber Reinforced Plastics) has been used many industries aerospace, automobile, medical device and building material industries, etc. Because it is lighter than other metals and has good properties, such as rigidity, strength and wear. CFRP may be cured integrity. However, it needs postprocessing similar to drilling or endmilling for shape cutting and combination of various material. In this paper, tool dynamometer and accelerometer used to signal analysis for machining properties under various cutting conditions and tool shape changes. In addition, microscope used to verify the machined CFRP surface. As the results, it was found that the cutting force and the vibration were decreased in the increasing of cutting edge (2-flute < 4-flute < composite tool), and the good machined surface can be obtained in this experiments.

Flexural Behavior of Reinforced Concrete Beams Strengthened with Grid-typs Carbon Fiber Plastics (탄소격자섬유로 보강한 철근 콘크리트보의 휨파괴 특성에 관한 연구)

  • 태기호
    • Journal of Ocean Engineering and Technology
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    • v.14 no.1
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    • pp.52-59
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    • 2000
  • Flexural fracture characteristics of newly-developed Grid-type carbon fiber plastics in the deteriorated reinforced concrete structures were investigated by the four-points fracture test to verify the strengthening effects in the beam specimens. Results showed that initial cracks appeared in the boundary layers of fibers embedded in the newly-placed mortar concrete slowly progressed to the direction of supports and showed fracture of fiber plastics and brittle failure of concrete in compression in sequence after the yielding of steel reinforcement. Accordingly the reasonable area of Grid-type carbon-fiber plastics in the strengthening design of deteriorated RC structures should be limited and given based on the ultimate strength design method to avoid the brittle failure of concrete structures.

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Methods of Separating Used Plastics for Recycling (폐플라스틱의 선별기술)

  • 윤여환
    • Resources Recycling
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    • v.6 no.2
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    • pp.12-21
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    • 1997
  • Plastics waste constitutes approximately 23% by volume of the municipal solid waste(MSW) generated in the U.S. each year, and have slow rate of degradation in the environment. Therefore, there is a great deal of public pressure to recycle plastics, and more than 100 million people participate in the curbside recycling programs. Despite the high level of public interest, only 3.5% of the plastic are recycled, which is substantially lower than the recycle rates of other materials such as paper fibers, glass, and iron. Although a large part of the reason is due to the low price of virgin polymers, which in turn is due to the low price of oil, it is possible to make the plastics recycling as a profitable business by developing advanced technologies. In this communication, various methods of separating pplastics from metals and from each other are discussed.

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Status and innovation plan of manufacturing technology in plastics engineering - focusing on thermoplastics, composites and molds - (플라스틱 공학에서 제조 기술의 현황과 혁신 방안 - 열가소성수지, 복합재료와 금형을 중심으로 -)

  • Kim, Sun-Kyoung
    • Design & Manufacturing
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    • v.15 no.2
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    • pp.1-10
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    • 2021
  • In this study, the current state of the plastics industry has been examined. The direction of development and innovation is reviewed and commented. The technical statuses of various sectors such as thermoplastic resin, composite material, mold engineering, and simulation have been scrutinized. In addition, the industrial status of each sector has been reviewed. Then, the challenges that the plastics manufacturing industry has to deal with have been discussed. Especially, the situation in Republic of Korea has been elaborated in detail. Based on the discussion, an open innovation strategy has been suggested. It has been argued in this work that the open innovation strategy will enables efficient funding and development by avoiding resource consuming rent seeking.