Optimization of injection-molded light guide plate with microstructures by using reciprocal comparisons

Kuo, Chung‐Feng Jeffrey; Dewantoro, Gunawan; Huang, Chung-Ching

doi:10.1007/s10845-013-0826-y

Cited by 12 publications

(6 citation statements)

References 26 publications

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“…ANOVA (Kuo et al 2013) Although there are preset target values for various experiments, it is difficult to avoid experimental errors. Since errors are inevitable, we can analyze obtained experimental values at different factor levels in order to know the influence of the various factors on errors, hereinafter called factor significance.…”

Section: Optimization Theorymentioning

confidence: 99%

“…While the Taguchi method is mainly used for optimizing single quality property (Kuo et al 2013;Kuo and Lan 2014;Zainal et al 2013), optimal processing parameters that determine the single quality do not represent the optimization of process parameters for the overall quality. For this reason, Taguchi method should be combined with other methods.…”

Section: Introductionmentioning

confidence: 99%

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Optimization and practical verification of system configuration parameter design for a photovoltaic thermal system combined with a reflector

et al. 2015

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This study designed and optimized the system parameters for a photovoltaic thermal system (PV/thermal system) combined with reflectors. Moreover, it discussed the gain of electrical efficiency and thermal efficiency on the system after adding two reflectors on each of the south and north sides, and adjusting the water circulation system. As the rising angle and position of the sun varies each season, in order to make this study more rigorous, experiments were conducted in four seasons of a year. The Taguchi orthogonal array was used for experimental planning, and the optimal parameters were analyzed for electrical efficiency and thermal efficiency. The analysis of variance was conducted to examine the influential parameters, and principal component analysis was used to calculate the principal component point of each experiment. The results were employed to construct a response surface methodology model. Finally, the steepest descent method was applied to obtain the optimal parameters. The reflector theory was applied to calculate the gain of solar radiation amount after installing the reflector. Moreover, the gain was inputted into the simulation software TRNSYS to simulate the electrical power output and the water temperature in the water storage tank. The confirmatory experiments of the four seasons found that the electrical energy after installing the reflector increased by 0.117-0.183 kWh, and the thermal energy increased by 1.7-2.6 • C. The experiment confirmed that the prediction error was <4 %.Keywords Photovoltaic/thermal (PV/T) · Reflector · Taguchi method · Analysis of variance (ANOVA) · Principal component analysis (PCA) · Response surface methodology (RSM) · Steepest descent method (SDM) · Transient system simulation tool (TRNSYS) List of symbolsP Total generated electrical energy during the day (kWh) G Total solar radiation energy during the day (J/m 2 ) A Module dimension (m 2 ) V m PV voltage at maximum power point (V) I m PV current at maximum power point (A) Q Total generated thermal energy during the day (J) V Water mass flow rate (kg/s) C p Water specific heat (4.18 kJ/kg • C) T f Water final temperature ( • C) T i Water initial temperature ( • C) A r1_a Actual receivable area of upper reflector (m 2 ) W 1 Upper plate width (m) W 1 Upper plate reflect to module width (m) L 1 Upper plate reflect to module height (m) L 1 Upper plate height (m) A r1 Reflection area of upper reflector (m 2 ) 123 J Intell Manuf θ Included angle between reflector and azimuth ( • C) A r2_a Actual receivable area of lower reflector (m 2 ) W 2 Lower plate width (m) W 2 Lower plate reflect to module width (m) L 2 Lower plate height (m) L 2 Lower plate reflect to module height (m) A r 2Reflection area of lower reflector (m 2 ) G r1_c Reflection solar radiation of upper plate (J/m 2 ) G r1Receiving solar radiation of upper reflector (J/m 2 ) L 1Upper plate reflect to module lengthen width (m) G r2_c Reflection solar radiation of lower plate (J/m 2 ) G r2Receiving solar radiation of lower reflector (J/m 2 )

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Section: Optimization Theorymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optimization and practical verification of system configuration parameter design for a photovoltaic thermal system combined with a reflector

et al. 2015

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“…A high injection speed and high molding pressure were required to completely fill the mold, but it was easy to produce parts with defects similar to high residual stress and warpage. Kuo et al [ 20 ] used injection molding to fabricate LGPs with microstructures. They wanted to make the depth and angle of the V-cut microstructures as close to the target values and minimize the LGP’s residual stresses.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Melt Front Behavior of a Light Guiding Plate during the Filling Phase of Micro-Injection Molding

et al. 2022

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When the size of a liquid crystal display (LCD) increases, the light guiding plate (LGP) as the main part of the LCD must adopt a wedge-shaped plate to reduce its weight (the thickness of the LGP decreases because of this) and guide the light to the LCD screen. Micro-injection molding (MIM) is commonly used to manufacture LGPs. During the filling phase of MIM, the entire entering polymer melt front of the LGP should reach the end of the mold cavity at the same time. In this way, there will be no shrinkage or warpage of the LGP in its subsequent application, but it is difficult for the wedge-shaped LGP to meet these requirements. Therefore, the authors hoped to investigate MIM process parameters to change this situation. Otherwise, the LGP is easily deformed during the manufacturing process. Flow characteristics of LGPs were investigated during the filling phase of MIM in this study. Experimental and 3D numerical simulations were used to analyze the hysteresis, i.e., the advance of the polymer melt front of the LGP in MIM. Study results showed that a low injection speed caused a hysteresis effect of the plastic melt front, the solution was to increase the injection speed to improve the situation and an injection speed of 10 cm/s could achieve uniformity of the melt front in MIM. The research results showed that the filling situation of the LGP of MIM in the experiment was very close to that of the 3D numerical simulation.

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“…1,2 In this process, inadequate surface treatment of the screw can cause a variety of defects in LGP, including black discoloration and formation of yellow streaks. 3,4 In general, the part thickness is less than 0.5 mm and a microstructural array exists on the surface, so that injection molding processing of LGP is very different from that of conventional parts. [5][6][7][8] As a result of the intense abrasion and corrosion of the screw surface, surface failure is commonly observed, which may create gaseous decomposition in the products 9 leading to the observed black discoloration and yellow streaks on the surface, unless the screw and screw tip have been subjected to an appropriate surface treatment.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of the Molding Quality of Light Guide Plates by means of Multi-Coating Surface Treatments of the Injection Molding Screw

Ranran¹,

Yang²,

Xie³

2017

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The effects of different surface treatments of an injection molding screw have been investigated using light guide plates as a representative precision component. The quality of the fabricated light guide plates was compared for different screw coatings, using the stripping performance, surface microstructure and adhesion strength as criteria. In addition, the results obtained using different combinations of screw coatings were analyzed in order to identify the optimum screw surface treatment method for the large scale production of polycarbonate light guide plates. It was found that light guide plate parts fabricated using a screw with a TiAlN/Cr multi-coating had the best performance, with a defect percentage of only 0.11%, much lower than the value of 19.21% obtained using a screw with a conventional hard chrome coating.

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Optimization of injection-molded light guide plate with microstructures by using reciprocal comparisons

Cited by 12 publications

References 26 publications

Optimization and practical verification of system configuration parameter design for a photovoltaic thermal system combined with a reflector

Optimization and practical verification of system configuration parameter design for a photovoltaic thermal system combined with a reflector

Analysis of Melt Front Behavior of a Light Guiding Plate during the Filling Phase of Micro-Injection Molding

Enhancement of the Molding Quality of Light Guide Plates by means of Multi-Coating Surface Treatments of the Injection Molding Screw

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