Plastic Part Design for Injection Molding

Malloy, Robert A.

doi:10.3139/9783446433748.fm

Cited by 97 publications

(92 citation statements)

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“…It means that if the temperature is lowered below this value, the polymeric parts are rigid enough to be removed from the mold without any damage [23]. With 30 vol% of TiO2 the cooling time to reach ejection temperature decreased by 35%, with talc it decreased by 50% and in the case of BN by more than 70%.…”

Section: Figure Cooling Gradients Of the Samples (A Pp; B Pp + 30 Vmentioning

confidence: 99%

Injection molding of ceramic filled polypropylene: The effect of thermal conductivity and cooling rate on crystallinity

2013

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Three different nano-and micro-sized ceramic powders (boron-nitride (BN), talc and titanium-dioxide (TiO2)) in 30 vol% have been compounded with a polypropylene (PP) matrix. Scanning electron microscopy (SEM) shows that the particles are dispersed smoothly in the matrix and larger aggregates can not be discovered. The cooling gradients and the cooling rate in the injection-molded samples were estimated with numerical simulations and finite element analysis software. It was proved with differential scanning calorimetry (DSC) measurements that the cooling rate has significant influence on the crystallinity of the compounds. At a low cooling rate BN works as a nucleating agent so the crystallinity of the compound is higher than that of unfilled PP. On the other hand, at a high cooling rate, the crystallinity of the compound is lower than that of unfilled PP because of its higher thermal conductivity. The higher the thermal conductivity is, the higher the real cooling rate in the material, which influences the crystallization kinetics significantly.

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Section: Figure Cooling Gradients Of the Samples (A Pp; B Pp + 30 Vmentioning

confidence: 99%

Injection molding of ceramic filled polypropylene: The effect of thermal conductivity and cooling rate on crystallinity

2013

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“…Making the outside radius one wall thickness larger than the inside radius will maintain constant wall thickness through corners (Malloy, 2010): …”

Section: Corner Designmentioning

confidence: 99%

“…To facilitate faster ejection, a draft angle of 1°-3°should be applied to all walls parallel to the parting direction of the clamping unit (Malloy, 2010).…”

Section: Draft Anglesmentioning

confidence: 99%

Application of SolidWorks Plastic in the Training in Mechanical Engineering

Bakalova

2017

AJTUV

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“…Which makes the whole shape distorted, it is called by warpage which determines dimensional accuracy in injection molding. Warpage is mainly caused by the difference of residual stress in the molded product due to inhomogeneity in speeds of molding flows and cooling [9][10][11]. In this study, injection molding analysis using FEA software was performed to estimate injection quality in 2 cavity process.…”

Section: Introductionmentioning

confidence: 99%

Analytical and experimental study on the quality improvement of 2 cavity injection-molded LCD frame

Son¹,

Jang²,

Han³

et al. 2012

Journal of the Korea Academia-Industrial cooperation Society

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The LCD frame is an important part which supports the BLU of medium/large sized TFT-LCD. To produce it efficiently, it is necessary to achieve the molding process improvement from 1 cavity to 2 cavity system. Because 2 cavity mold is compact and its hot-runner zone is broadened, it is difficult to control the temperature on the mold. In this study, injection molding analysis on the frame in 2 cavity process with FEA(Finite Element Analysis) software is carried out to estimate its quality. The calculated injection molding pressures and maximum deflection in 1 and 2 cavity processes are 41.13 MPa and 1.62 ㎜, 40.49 MPa and 1.66 ㎜ respectively. The measured maximum flexure load and surface roughness of the left and right frame of 2 cavities are 209 N and 0.08 ㎛, 193 N and 0.10 ㎛ while those in 1 cavity are 140 N and 0.13 ㎛. Thermal image shows that the maximum standard deviation of the temperature on left and right side of 2 cavity mold is 1.23 ℃ The simulation and measurement results show that the quality of the frame in 2 cavity injection molding process as a whole is not worse than that of 1 cavity system. But maximum flexure loads of the frame in 2 cavity process are far greater than that in 1 cavity process.

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Plastic Part Design for Injection Molding

Cited by 97 publications

References 0 publications

Injection molding of ceramic filled polypropylene: The effect of thermal conductivity and cooling rate on crystallinity

Injection molding of ceramic filled polypropylene: The effect of thermal conductivity and cooling rate on crystallinity

Application of SolidWorks Plastic in the Training in Mechanical Engineering

Analytical and experimental study on the quality improvement of 2 cavity injection-molded LCD frame

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