scholarly journals Thermal Conductivity Augmentation of Epoxy Injection Moulds for Cooling Time Reduction

2014 ◽  
Author(s):  
Khurram Altaf ◽  
Ahmad Majdi Abdul Rani
Keyword(s):  
Thermal Conductivity ◽  
Cooling Time ◽  
Time Reduction

scholarly journals Improving Cooling Performance of Injection Molding Tool with Conformal Cooling Channel by Adding Hybrid Fillers

Polymers ◽  
2021 ◽  
Vol 13 (8) ◽  
pp. 1224
Author(s):  
Chil-Chyuan Kuo ◽  
Wei-Hua Chen
Keyword(s):  
Thermal Conductivity ◽  
Injection Molding ◽  
Cooling Time ◽  
Performance Ratio ◽  
Cooling Efficiency ◽  
Cooling Channel ◽  
Conformal Cooling Channel ◽  
Conformal Cooling ◽  
Fused Deposition ◽  
Silicone Rubber Mold

Silicone rubber mold (SRM) is capable of reducing the cost and time in a new product development phase and has many applications for the pilot runs. Unfortunately, the SRM after injection molding has a poor cooling efficiency due to its low thermal conductivity. To improve the cooling efficiency, the thermal conductivity of the SRM was improved by adding fillers into the SRM. An optimal recipe for fabricating a high cooling efficiency low-pressure injection mold with conformal cooling channel fabricated by fused deposition modeling technology was proposed and implemented. This study proposes a recipe combining 52.6 wt.% aluminum powder, 5.3 wt.% graphite powder, and 42.1 wt.% liquid silicon rubber can be used to make SRM with excellent cooling efficiency. The price–performance ratio of this SRM made by the proposed recipe is around 55. The thermal conductivity of the SRM made by the proposed recipe can be increased by up to 77.6% compared with convention SRM. In addition, the actual cooling time of the injection molded product can be shortened up to 69.1% compared with the conventional SRM. The actual cooling time obtained by the experiment is in good agreement with the simulation results with the relative error rate about 20%.

Cooling Time Reduction for Focused Ultrasound Surgery by Dynamically Adjusting Sonication Time

2011 ◽  
Author(s):  
Li Dehui ◽  
Shen Guofeng ◽  
Bai Jinfeng ◽  
Chen Yazhu ◽  
Yoichiro Matsumoto ◽  
...  
Keyword(s):  
Focused Ultrasound ◽  
Cooling Time ◽  
Sonication Time ◽  
Ultrasound Surgery ◽  
Focused Ultrasound Surgery ◽  
Time Reduction

scholarly journals Influence of the Mold Material on the Injection Molding Cycle Time and Warpage Depending on the Polymer Processed

Polymers ◽  
2021 ◽  
Vol 13 (18) ◽  
pp. 3196
Author(s):  
Thomas Lucyshyn ◽  
Lara-Vanessa Des Enffans d’Avernas ◽  
Clemens Holzer
Keyword(s):  
Thermal Conductivity ◽  
Injection Molding ◽  
Cycle Time ◽  
Experimental Studies ◽  
Simulation Software ◽  
Mold Material ◽  
Parameter Study ◽  
Cycle Time Reduction ◽  
Time Reduction ◽  
The Impact

The thermal properties of the mold influence the cooling situation in the injection molding process. While there are experimental studies investigating the influence of special mold materials, they are limited to few polymers. In this work, an extensive parameter study with the simulation software Autodesk Moldflow Insight was performed to analyze the influence of the polymer itself on the impact of the mold steel on cycle time and warpage. The investigated part was a box with two thickness variations. A conventional mold steel was compared with a steel grade featuring approximately double the thermal conductivity. Simulations were performed with 18 polymers covering the most common material families. The main finding of this study was that the influence of the higher mold conductivity on cycle time ranged from an almost negligible reduction (3%) up to a strong effect (24%), depending mainly on the used polymers, but also on the part thickness. For the cycle time reduction, a correlation was found, with the melt, mold and ejection temperature being the dominant influencing factors of the polymers. With this correlation, it was possible to estimate the potential of cycle time reduction for other polymers. The simulations also showed a positive influence of the higher mold thermal conductivity on part warpage.

scholarly journals To the Theory of Unsteady Thermal Conductivity Caused by the Hot Core of the Earth

Inventions ◽  
2021 ◽  
Vol 6 (4) ◽  
pp. 90
Author(s):  
Sergey O. Gladkov
Keyword(s):  
Thermal Conductivity ◽  
Thermal Radiation ◽  
Cooling Time ◽  
The Core ◽  
The Earth

A solution is given to the spatial-temporary distribution of temperature in the volume of the Earth, due to the specified power of the thermal radiation of the hot core. An estimate is made of the maximum possible cooling time of the core.

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