A new method was proposed for replicating snow crystals that uses light-curing resin containing no harmful substances, as the replicating material, and the 3D reproduction of a snow crystal by stereolithography was conducted. It was found that a UV light irradiation density of at least 0.6 mW/cm was required to complete the light-hardening reaction within 15 min when polyene/polythiol resin (NOA81) was used as the light-curing resin. When the atmospheric temperature was 0 °C, the maximum temperature rise due to the light-hardening reaction was 4.2 °C at an irradiation density of 1.0 mW/cm. This suggests that the initial temperature of the light-curing resin must be approximately -5 °C to prevent the snow crystal from melting when an irradiation density of 1.0 mW/cm is applied at an atmospheric temperature of below 0 °C. This replication method has sufficient accuracy to reconstruct the 3D shape of a snow crystal. The 3D reproduction of a snow crystal by stereolithography was conducted by transforming the CSV-formatted 3D profile height data to STL-formatted CAD data.
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机译:提出了一种新的雪晶复制方法,该方法使用不含有害物质的光固化树脂作为复制材料,并通过立体光刻技术对雪晶进行了3D复制。发现当使用多烯/聚硫醇树脂(NOA81)作为光固化树脂时,在15分钟内完成光硬化反应需要至少0.6mW / cm的UV光照射密度。当大气温度为0℃时,在1.0mW / cm 2的照射密度下,由于光硬化反应引起的最大温度升高为4.2℃。这表明,当在低于0°C的大气温度下施加1.0 mW / cm的照射密度时,光固化树脂的初始温度必须约为-5°C,以防止雪晶熔化。这种复制方法具有足够的精度来重建雪晶的3D形状。通过将CSV格式的3D轮廓高度数据转换为STL格式的CAD数据,可以通过立体光刻技术对雪晶进行3D复制。
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