Research on temperature and pressure responses in the rapid mold heating and cooling method based on annular cooling channels and electric heating

Wang, Guilong; Yang, Hongguang; Zhang, Lei; Zhao, Guoqun

doi:10.1016/j.ijheatmasstransfer.2017.09.126

Cited by 24 publications

(16 citation statements)

References 38 publications

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“…The cavity of the plasticizing chamber is a cylinder with a diameter of 10 mm and a height of 45 mm. The mold temperature has a significant influence on the melt fluidity [27,28] but has little effect on the plasticizing process. Therefore, the influence of the mold temperature in the plasticized process is ignored in this paper.…”

Section: Equipmentmentioning

confidence: 99%

“…For PMMA, PP, and PA66, when the ultrasonic amplitude range was 20-30 μm, the distribution of the friction surface of the polymer pellets were as shown in Figure 15. When the ultrasonic amplitude increased to 30 μm, the proportion of friction surface of inter-pellets were 46.2% (+14.3%), 49.0% (+10.5%), and 41.9% (+3.8); the proportion of the end face were 27.9% (−9.5%), 28 For PMMA, PP, and PA66, when the plasticizing pressure range was 10-30 MPa, the distribution of the friction surface of the polymer pellets were as shown in Figure 14. With increasing the plasticizing pressure, the heat generation efficiency of friction increased, thus increases the sample density.…”

Section: Contact Area Of the Polymer Pelletsmentioning

confidence: 99%

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Evolution of Interfacial Friction Angle and Contact Area of Polymer Pellets during the Initial Stage of Ultrasonic Plasticization

et al. 2019

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Interfacial friction heating is one of the leading heat generation mechanisms during the initial stage of ultrasonic plasticization of polymer pellets, which has a significant influence on the subsequent viscoelastic heating according to our previous study. The interfacial friction angle and contact area of polymer pellets are critical boundary conditions for the analysis of interfacial frictional heating of polymer pellets. However, the duration of the interfacial friction heating is extremely short in ultrasonic plasticization, and the polymer pellets are randomly distributed in the cylindrical barrel, resulting in the characterization of the distribution of the interfacial friction angle and contact area to be a challenge. In this work, the interfacial friction angle of the polymer pellets in the partially plasticized samples of polymethyl methacrylate (PMMA), polypropylene (PP), and nylon66 (PA66) were characterized by a super-high magnification lens zoom 3D microscope. The influence of trigger pressure, plasticizing pressure, ultrasonic amplitude, and vibration time on the interfacial friction angle and the contact area of the polymer pellets were studied by a single factor experiment. The results show that the compaction degree of the plasticized samples could be enhanced by increasing the level of the process parameters. With the increasing parameter level, the proportion of interfacial friction angle in the range of 0–10° and 80–90° increased, while the proportion in the range of 30–60° decreased accordingly. The proportion of the contact area of the polymer pellets was increased up to 50% of the interfacial friction area which includes the upper, lower, and side area of the cylindrical plasticized sample.

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Section: Equipmentmentioning

confidence: 99%

Section: Contact Area Of the Polymer Pelletsmentioning

confidence: 99%

Evolution of Interfacial Friction Angle and Contact Area of Polymer Pellets during the Initial Stage of Ultrasonic Plasticization

et al. 2019

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“…It was found that the part warpage decreased with the increasing mold temperature. Zhao et al [2,3] analysed the effect of rapid changing mold temperature on improving microscopic feature replication and molded part appearance. e results showed that the rapid heating of the cavity helped the polymer melt to replicate the surface topography of the mold.…”

Section: Introductionmentioning

confidence: 99%

Advances in Polymer Technology Application of Pareto-Based Genetic Algorithm in Determining Layout of Heating Rods for a Plastic Injection Mold

Gong

Wang

et al. 2020

Advances in Polymer Technology

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The Pareto-based genetic algorithm is an effective way to solve complex optimization design problems in engineering. In this study, first, the principles of Pareto optimal solutions and multiobjective genetic algorithm were presented. Second, to investigate the influence of the mold temperature on the products’ performances, a multicavity experiment injection mold was designed whose temperature could be controlled by the heating rods. To obtain a homogeneous temperature distribution across the multicavity surfaces after the heating stage, multiobjective optimization models for the heating rods layout were established based on the heat transfer process of the mold. Finally, the Pareto-based genetic algorithm and finite element method were combined to solve the optimized models to obtain the optimal solution. After a finite element analysis and experimental injection, it is proved that the optimized distribution of the heating rods in the mold is necessary for the experiment and production.

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“…In this way, the ejection can take place sooner thanks to more efficient cooling in the cooling stage, despite a warmer mold surface temperature during mold filling and packing stages. If special molding heating and cooling techniques, such as rapid mold temperature control, rapid heat cycle molding (RHCM), or highly engineered cooling channels, can be employed , the overall cycle time can be improved even more.…”

Section: Introductionmentioning

confidence: 99%

Injection molding of delamination‐free ultra‐high‐molecular‐weight polyethylene

Yilmaz

Yang

Turng

2019

Polymer Engineering & Sci

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When ultra‐high‐molecular‐weight polyethylene (UHMWPE) in powder form is injection molded, the so‐called delamination layering occurs near the skin of the parts. This layering defect hampers UHMWPE's superior wear resistance property and part surface quality. The delamination layer was caused by a combination of excessive shear stress near the part surface and high degree of molecular entanglement of UHMWPE. A mold insulation method that delays the rapid cooling of UHMWPE to reduce the shear stress and improve the polymer chain “interdiffusion” across the entangled chain bundles was used to eliminate the delamination layer. When the insulation layer thickness and mold temperature were optimized, the delamination layer was eliminated completely while still maintaining a reasonable cooling/cycle time. The delamination‐free parts were found to regain UHMWPE's superior impact resistance and tensile properties. POLYM. ENG. SCI., 59:2313–2322, 2019. © 2019 Society of Plastics Engineers

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Research on temperature and pressure responses in the rapid mold heating and cooling method based on annular cooling channels and electric heating

Cited by 24 publications

References 38 publications

Evolution of Interfacial Friction Angle and Contact Area of Polymer Pellets during the Initial Stage of Ultrasonic Plasticization

Evolution of Interfacial Friction Angle and Contact Area of Polymer Pellets during the Initial Stage of Ultrasonic Plasticization

Advances in Polymer Technology Application of Pareto-Based Genetic Algorithm in Determining Layout of Heating Rods for a Plastic Injection Mold

Injection molding of delamination‐free ultra‐high‐molecular‐weight polyethylene

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