• Title, Summary, Keyword: Injection Temperature

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Variations of Temperature and Pressure in the Cavity for Operational Conditions of Injection Molding (사출성형의 공정변수에 따른 캐비티 내의 온도와 압력의 변화)

  • Kim S. W.;Park H. C.;Lyu M.-Y.;Jin Y. S.;Kim D.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.70-74
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    • 2004
  • Pressure and temperature in the cavity of injection molding have been investigated. Special injection mold was designed to install pressure and temperature sensors. The sensors were supplied by KISTLER and the pressure and temperature were measured for various operational conditions, such as injection pressure, holding pressure, cooling time, mold temperature, and injection temperature. As injection pressure increased cavity pressure and temperature increase. There were no big differences in temperatures according to the holding pressures. As mold temperature increased pressure and temperature in the cavity increase. The flowability of resin increases as mold temperature increases subsequently the pressure in the cavity increases since the pressure loss is less in the low viscous medium than high ciscous medium. The cavity temperature highly depends upon mold temperature.

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A Study on Injection Characteristic using Active Temperature Control of Injection mold (사출 금형의 능동형 온도제어에 따른 사출특성에 관한 연구)

  • Cho, C.Y.;Sin, H.G.;Hong, N.P.;Seo, Y.H.;Kim, B.H.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.302-305
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    • 2007
  • In recent years, many researches on new storage media with high capacity and information are developing. For manufacture of optical storage with high capacity, the injection molding process is generally used. In order to increase the filling ratio of the injection molding structure, the injection molding process required for high injection pressure, packing pressure and temperature control of the mold. However, conventional injection molding process is difficult to increase the filling ratio using injection master with the range of several nanometers and high aspect ratio. In order to improve and increase filling ratio of nano-structure with high aspect ratio, the active temperature control of injection mold was used. Experimental conditions were used injection pressure, time and temperature. Consequently, by using the peltier device into injection mold, we carried out the efficient and active temperature control of mold at low cost.

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A Study on Optimal Solution of Short Shot Using Fuzzy Logic Based Neural Network(FNN) (퍼지-신경망을 이용한 미성형 사출제품의 최적해결에 관한 연구)

  • Kang, Seong-Nam;Huh, Yong-Jeong;Cho, Hyun-Chan
    • Proceedings of the Korean Institute of Intelligent Systems Conference
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    • pp.83-86
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    • 2001
  • In injection molding, short shot is one of the frequent and fatal defects. Experts of injection molding usually adjust process conditions such as injection time, mold temperature, and melt temperature because it is the most economic way in time and cost. However it is a difficult task to find appropriate process conditions for troubleshooting of short shot as injection molding process is a highly nonlinear system and process conditions are coupled. In this paper, a fuzzy neural network(FNN) has been applied to injection molding process to shorten troubleshooting time of short shot. Based on melt temperature and fill time, a reasonable initial mold temperature is recommended by the FNN, and then the mold temperature is inputted to injection molding process. Depending on injection molding result, specifically the insufficient quantity of an injection molded part, an appropriate mold temperature is recommend repeatedly through the FNN.

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Shrinkage in Injection molded Part for Operational Conditions and Resins (성형조건과 수지의 종류에 따른 사출 성형품의 성형 수축)

  • 모정혁;김현진;류민영
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.363-370
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    • 2003
  • Shrinkage of injection molded parts is different form operational conditions of injection molding such as injection temperature, injection pressure and mold temperature, and mold design such as gate size. It is also various for different resins which have crystalline structure or not. In this study part shrinkage was investigated for various operational condition and resins; PBT for crystalline polymer, and PC and PMMA for amorphous polymer was used in experiment. Crystalline polymer shows higher part shrinkage by about three times than amorphous polymer. Part shrinkage increased as injection temperature and mold temperature increased and injection pressure decreased. Part shrinkage decreased as gate size increased since the pressure delivery is mush easier for large gate size. Part shrinkage according to the gate location was that the position in the part with close to the gate showed large shrinkage and this phenomenon might be occurred by residual stress.

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A Study on Optimal Solution of Short Shot Using Modular Fuzzy Logic Based Neural Network (MENN) (모듈형 퍼지-신경망을 이용한 미성형 사출제품의 최적 해결에 관한 연구)

  • 강성남;허용정;조현찬
    • Journal of the Korean Institute of Intelligent Systems
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    • v.11 no.6
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    • pp.465-469
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    • 2001
  • In injection molding short shot is one of the frequent and fatal defects. Experts of Injection molding usually adjust process conditions such as injection time, mold temperature, and melt temperature because it is most economic way in time and cost. However, it is difficult task to find appropriate process conditions for troubleshooting of short shot as injection molding process is a highly nonlinear system and process conditions are coupled. In this paper, a modular fuzzy neural network (MFNN) has been applied to injection molding process to shorten troubleshooting time of short shot. Based on melt temperature and fill time, a reasonable initial mo이 temperature is recommenced by the NFNN, and then the mold temperature is inputted to injection molding process. Depending on injection molding result, specifically the insufficient quantity of an injection molded part. and appropriate mold temperature is recommend repeatedly through the NFNN.

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Effects of Pilot Injection on Low Temperature Diesel Combustion (파일럿 분사가 저온 디젤 연소에 미치는 영향)

  • Han, Sang-Wook;Bae, Choong-Sik
    • Transactions of the Korean Society of Automotive Engineers
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    • v.20 no.3
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    • pp.141-147
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    • 2012
  • A direct injection diesel engine with large amount of exhaust gas recirculation was used to investigate low temperature diesel combustion. Pilot injection strategy was adopted in low temperature diesel combustion to reduce high carbon monoxide and hydrocarbon emissions. Combustion characteristics and exhaust emissions of low temperature diesel combustion under different pilot injection timings, pilot injection quantities and injection pressures were analyzed. Retarding pilot injection timing, increasing pilot injection quantity and higher injection pressure advanced main combustion timing and increased peak heat release rate of main combustion. As a result of these strategies, carbon monoxide and hydrocarbon emissions were reduced. Soot emission was slightly increased with retarded pilot injection timing while the effect of pilot injection on nitrogen oxides emission was negligible under low combustion temperature condition. Spatial distribution of fuel from the spray targeting visualization was also investigated to provide more insight into the reason for the reduction in carbon monoxide and hydrocarbon emissions.

A Study on the Weld Line Strength in Injection Molded Part (사출성형품의 웰드라인 강도에 관한 연구)

  • 모정혁;홍형식;류민영
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.211-216
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    • 2003
  • Weld line in injection molded part is one of the defect in injection molding process. Weld line deteriorates not only appearance quality but mechanical property. In this study weld line strength has been examined according to the injection operational conditions, materials and mold designs. PC and PP were used, and four different specimens were used in this experiment. Weld line strength decreased as injection temperature increases for PC. It was more dependent on mold temperature than injection temperature for PP Among the four different specimens, uneven thickness specimen showed the highest weld line strength.

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Design of Injection Mold with Cavity Pressure/Temperature Sensors and Molding for Standard Tensile Test Specimen (내압력.온도센서를 갖는 표준 인장시편용 사출금형설계 및 성형)

  • Lee D.M.;Han B.K.;Lee O.S.;Lee Sung-Hee
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.1416-1419
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    • 2005
  • Design and manufacturing of plastic injection mold with cavity pressure/temperature sensors were performed in the present study for tensile test specimen. Standards of mold-base and tensile test specimen were used to design an injection molding system. Cavity pressure and temperature sensors were placed on the side of fixed platen of injection mold machine to prevent them from external impact damage. Injection molding experiments with variations of injection speed and melt temperature were performed and polycarbonate tensile specimens were prepared for the tensile test. It was shown that injection molding processing parameters can have effect on the mechanical properties of the plastic injection molded part.

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Injection Mold with Cavity Pressure/Temperature Sensors for Standard Tensile Test Specimen (내압력.온도센서를 갖는 표준 인장시편용 사출금형)

  • Lee, Do-Myoung;Han, Byoung-Kee;Lee, Sung-Hee
    • Journal of the Korean Society for Precision Engineering
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    • v.24 no.11
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    • pp.84-90
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    • 2007
  • In this study, design and manufacturing of plastic injection mold with cavity pressure/temperature sensors were performed fur tensile test specimen. International standard system for plastic tensile specimen was applied to design an injection molding system. Cavity pressure and temperature sensors were placed on the side of fixed platen of the injection mold to prevent them from external impact damage. Injection molding experiments with variations of injection speed and melt temperature were performed and then tensile test of the manufactured polycarbonate specimens was also performed. It was shown that injection molding processing parameters can have effect on the mechanical properties of the plastic injection molded part.

Measurement Uncertainty Estimation of Injection Temperature in Injection Molding Machine (사출성형기의 사출온도에 대한 측정 불확도 추정)

  • Jung, Hyun-Suk;Yoo, Joong-Hak
    • Journal of The Korean Society of Manufacturing Technology Engineers
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    • v.22 no.1
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    • pp.145-149
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    • 2013
  • The performance of injection molding machine's control system, such as reproducibility, repeatability, etc, is widely studied nowadays. Since screw stroke, injection cylinder body pressure and barrel temperature are the most important terms of injection unit, interval linearity and repeatability to each parameter are analyzed here. Barrel temperature is analyzed according to the repeatability of the thermocouple at $150^{\circ}C$, $210^{\circ}C$, $300^{\circ}C$ using a precise oven. The result temperature is within ${\pm}0.5^{\circ}C$ Through the reliability evaluation of the most important terms of injection unit, the method of evaluating the linearity and repeatability is proposed and verified.