Gas-assisted mold temperature control for improving the quality of injection molded parts with fiber additives

Chen, Shia‐Chung; Minh, Pham Son; Chang, Jyh-Cheng

doi:10.1016/j.icheatmasstransfer.2010.11.001

Cited by 39 publications

(37 citation statements)

References 16 publications

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“…Figure 7 shows that the temperature difference is 44.3 ∘ C, 11.3 ∘ C, and 0.3 ∘ C when the mold gap size is 4 mm, 6 mm, and 8 mm, respectively. This result is in good agreement with our previous research [2,15].…”

Section: Effect Of Gmtc On the Heating Processsupporting

confidence: 94%

“…In our former study, when the GMTC was used for mold surface heating, there is a temperature difference between the inlet and outlet area [2,15]. Therefore, in this research, to evaluate the uniformity of the heating process for various mold gap sizes, the temperature at the gas inlet area and the gas outlet area was collected.…”

Section: Effect Of Gmtc On the Heating Processmentioning

confidence: 99%

“…Therefore, in this research, to evaluate the uniformity of the heating process for various mold gap sizes, the temperature at the gas inlet area and the gas outlet area was collected. In previous research, the GMTC heated the mold surface very efficiently [2,11]. However, in this research, because the GMTC is applied to improve the filling of the melt into the microgroove, the temperature at the bottom groove is collected and compared in Figure 7.…”

Section: Effect Of Gmtc On the Heating Processmentioning

confidence: 99%

“…Among typical molding parameters, the mold surface temperature is critical. At higher mold surface temperatures, the surface quality of the part will improve [1,2]. In the injection molding field, microinjection molding is used to manufacture a variety of polymer components, because of its low cost and potential for high-volume production.…”

Section: Introductionmentioning

confidence: 99%

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Gas-Assisted Heating Technology for High Aspect Ratio Microstructure Injection Molding

Chen

Lin

Chang

et al. 2013

Advances in Mechanical Engineering

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A hot gas is used for heating the cavity surface of a mold. Different mold gap sizes were designed. The mold surface temperature was heated to above the glass transition temperature of the plastic material, and the mold then closed for melt filling. The cavity surface can be heated to 130 ∘ C to assist the melt filling of the microfeatures. Results show that hot gas heating can improve the filling process and achieve 91% of the high aspect ratio microgrooves (about 640.38 m of the maximum of 700 m). The mold gap size strongly affects the heating speed and heating uniformity. Without surface preheating, the center rib is the highest. When the heating target temperature is 90 ∘ C or 100 ∘ C, the three microribs have a good uniformity of height. However, when the target temperature exceeds 100 ∘ C, the left side rib is higher than the other ribs.

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Section: Effect Of Gmtc On the Heating Processsupporting

confidence: 94%

Section: Effect Of Gmtc On the Heating Processmentioning

confidence: 99%

Section: Effect Of Gmtc On the Heating Processmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Gas-Assisted Heating Technology for High Aspect Ratio Microstructure Injection Molding

Chen

Lin

Chang

et al. 2013

Advances in Mechanical Engineering

Self Cite

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“…In this case, a thickness of 8 mm and the gas injection on the legs was established. It is well known that after production, the internal width of the chair legs will not be constant (Chen et al 2011), therefore, a less favorable situation was assumed for the requirement calculation. The geometric model for the calculation did not consider rounded edges, so a stress concentration in the base of the chair legs was expected, which involved an extra security factor.…”

Section: Product Engineeringmentioning

confidence: 99%

Bio-Based Composites From Stone Groundwood Applied to New Product Development

Julián¹,

Méndez²,

Espinach³

et al. 2012

BioResources

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a This paper deals with the product design, engineering, and material selection intended for the manufacturing of an eco-friendly chair. The final product is expected to combine design attributes with technical and legal feasibility with the implementation of new bio-based materials. Considering the industrial design, a range of objectives and trends were determined after setting the market requirements, and the final concept was proposed and modeled. The product geometry, production technology, and legal specifications were the input data for product engineering. The material selection was based on the technical requirements. Polypropylene (PP) composite materials based on coupled-fiberglass, sized-fiberglass, and coupled-stone ground wood reinforcements were prepared and characterized. Final formulations based on these PP composites are proposed and justified.

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Multiobjective optimization design of heating system in electric heating rapid thermal cycling mold for yielding high gloss parts

Xiao

Huang

2013

J of Applied Polymer Sci

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An optimization design method is developed for the electric heating system in rapid thermal cycling molding (RTCM) mold. First, a multiobjective optimization model is established, in which the distance between the mold cavity surface and the center of heating elements and the number and power density of heating elements are the design variables, the required heating time t h and the highest cavity surface temperature T max at time t h are the objective functions. Then, an optimization strategy consisting of design of experiment, finite element analysis, artificial neural network (ANN) and response surface methodology (RSM) models, and Paretobased genetic algorithm is proposed to solve the multiobjective optimization model. Finally, the optimization strategy is applied for the design of the heating system for an automotive spoiler blow mold. The results show that the temperature distribution uniformity on the blow mold cavity surface is obviously improved and high heating efficiency is also ensured with the optimized design parameters. Moreover, the ANN model exhibits its superiority over the RSM model in terms of modeling and predictive abilities. A RTCM blow mold with the optimized electric heating system is constructed and successfully utilized to mold high gloss automotive spoiler.

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Gas-assisted mold temperature control for improving the quality of injection molded parts with fiber additives

Cited by 39 publications

References 16 publications

Gas-Assisted Heating Technology for High Aspect Ratio Microstructure Injection Molding

Gas-Assisted Heating Technology for High Aspect Ratio Microstructure Injection Molding

Bio-Based Composites From Stone Groundwood Applied to New Product Development

Multiobjective optimization design of heating system in electric heating rapid thermal cycling mold for yielding high gloss parts

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