Simulation of infrared rapid surface heating for injection molding

Chang, Pei-Chi; Hwang, Sheng-Jye

doi:10.1016/j.ijheatmasstransfer.2006.04.014

Cited by 73 publications

(49 citation statements)

References 14 publications

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“…Dynamic mold temperature control was introduced [1,2], plug-in mold temperature control system was designed as shown in Figure 6. Instant heating and cooling processes shortens the time for the mold to increase temperature and cooling.…”

Section: Injectionmentioning

confidence: 99%

Applying dynamic mold temperature control to cosmetic package design

2017

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Abstract. Owing to the fashion trend and the market needs, this study developed the eco-cushion compact. Through the product design and the advanced process technology, many issues have improved, for instance, the inconvenience of transportation, the lack of multiuse capability, the increase of costs, and the low yield rate. The eco-cushion compact developed in this study was high quality, low cost, and meets the requirements of the eco market. The study aimed at developing a reusable container. Dynamic mold temperature control was introduced in the injection modeling process. The innovation in the product was its multi-functional formula invention, eco-product design, one-piece powder case design, and multifunctional design in the big powder case, mold flow and development of dynamic mold temperature control. Finally, through 3D drawing and modeling, and computer assistance for mold flow and verification to develop and produce models. During the manufacturing process, in order to solve the problems of tightness and warping, development and manufacture of dynamic mold temperature control were introduced. This decreased the injection cycle and residual stress, and deformation of the products has reduced to less than 0.2 mm, and the air tightness increased. In addition, air leakage was less than 2% and the injection cycle decreased to at least 10%.The results of the study can be extended and applied on the future design on cosmetic package and an alternative can be proposed to solve the problems of air tightness and warping. In this study, dynamic mold temperature control is considered as a design with high price-performance ratio, which can be adopted on industrial application for practical benefit and improvement.

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Section: Injectionmentioning

confidence: 99%

Applying dynamic mold temperature control to cosmetic package design

2017

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“…As the aspect ratio increases, the mold temperature must also increase [8,9]. The variotherm system [10] can satisfactorily reach such temperatures without a dramatic increase in cycle time. However, this process ultimately reduces the mold lifetime [11] and demands expensive tools.…”

Section: Introductionmentioning

confidence: 99%

Injection molding micro patterns with high aspect ratio using a polymeric flexible stamper

Park¹,

Lee²,

Moon³

et al. 2011

Express Polym. Lett.

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Abstract. Poor filling occurs during the injection molding process of micro-or nano-scale patterns mainly because the hot polymer melt rapidly cools and its skin quickly solidifies upon contact with the mold surface. In this study, it is proposed to use Polyethylene terephthalate (PET) film coated with patterned polyurethane acrylate (PUA) as an effective thermal barrier. It can significantly hinder heat transfer into the mold during the molding process and thus may keep the melt viscosity low for longer duration. As a result, the replication would be improved not only during the filling phase but also during the packing phase. In order to verify the validity of the use of polymeric stamper, the melt-film interface temperature was evaluated by numerical simulation. Experimental results indicated that patterns possessing widths within the range of one to tens of micrometers and a height of approximately 10 !m were successfully filled and demolded.

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“…The program can perform stray light analysis, illumination analysis, and optical systems analysis. It uses Monte Carlo ray tracing method to compute optical flux as it propagates through the lensed waveguide [18]. Then rays can be traced through the system to find energy distributions on 45° screen.…”

Section: Experimental Setup and Resultsmentioning

confidence: 99%

UV-curable liquid-core fiber lenses with controllable focal length

Bai¹,

Tsang²,

Jim³

et al. 2013

Opt. Express

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Lensed fiber optics is of great importance to many applications such as optical sensing, optical coupling, laser trapping etc. In this paper we have demonstrated a unique method to fabricate liquid-core lensed fibers by filling UV curable adhesive into hollow fibers, and to control the focal length and spot size by pumping liquid into or out of the fiber end. In experiment, tuning of focal length from 2.414 to 0.810 mm has been obtained, and solidification of the adhesive core has also been carried out successfully. Further simulation suggests that the focused spot size can be reduced to <10 micron by adjusting the refractive index and fiber geometry. Such technique has the potential to manufacture custom-made solid lensed fibers and liquid-core solid-tip lensed fibers in volume at low cost. The same technique may be used for input and output coupling of optofluidic waveguides with external optical components like optical fibers and lasers.

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Simulation of infrared rapid surface heating for injection molding

Cited by 73 publications

References 14 publications

Applying dynamic mold temperature control to cosmetic package design

Applying dynamic mold temperature control to cosmetic package design

Injection molding micro patterns with high aspect ratio using a polymeric flexible stamper

UV-curable liquid-core fiber lenses with controllable focal length

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