Study of Mechanical Strength of Weld-line in ABS Injection Molding Parts
碩士 === 龍華科技大學 === 機械系碩士班 === 92 === As the trend of getting smaller products becomes more popular, the demand on strength and quality for plastic product has also become more important.The weld -line is the weakness on the strength for injection plastic products, therefore has attracted many researc...
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ndltd-TW-092LHU004890092015-10-13T16:22:46Z http://ndltd.ncl.edu.tw/handle/65095060059932461611 Study of Mechanical Strength of Weld-line in ABS Injection Molding Parts ABS射出成型件縫合線強度之探討 Nan-Tsun Kuo 郭南村 碩士 龍華科技大學 機械系碩士班 92 As the trend of getting smaller products becomes more popular, the demand on strength and quality for plastic product has also become more important.The weld -line is the weakness on the strength for injection plastic products, therefore has attracted many researchers’ attentions. This thesis focuses on ABS to discuss how the strength of the weld-line is affected in Thin-wall Injection Molding. ABS is used to inject test pieces of ASTM standard, with and without weld-line, at various injection conditions and thicknesses. Test pieces are put onto ASTM for strength tests. In our study, the model for polymers proposed by Kim and Suh was also modified to establish an empirical correlation for strength with weld-line. This correlation uses the data of tested strength and method of regression analysis to take thickness of test pieces, melt temperature, mold temperature, packing pressure and injection velocity as independent factors. It is expected that this correlation can be used to predict the strength of product with weld-line. ABS has similar trend as other plastic material; that is increase on the melt temperature, mold temperature and injection velocity increase the strength of the test pieces at the weld-line, while the packing pressure has reverse effect. However, it is also found that at different piece thickness, i.e. 0.8mm, 1.0mm, 1.2mm and 2.5mm, weld-line has least strength at 1.0m, but best strength at 0.8mm. Tsyr-Jang Chen Shia-Chung Chen 陳詞章 陳夏宗 2004 學位論文 ; thesis 60 zh-TW |
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碩士 === 龍華科技大學 === 機械系碩士班 === 92 === As the trend of getting smaller products becomes more popular, the demand on strength and quality for plastic product has also become more important.The weld -line is the weakness on the strength for injection plastic products, therefore has attracted many researchers’ attentions. This thesis focuses on ABS to discuss how the strength of the weld-line is affected in Thin-wall Injection Molding. ABS is used to inject test pieces of ASTM standard, with and without weld-line, at various injection conditions and thicknesses. Test pieces are put onto ASTM for strength tests.
In our study, the model for polymers proposed by Kim and Suh was also modified to establish an empirical correlation for strength with weld-line. This correlation uses the data of tested strength and method of regression analysis to take thickness of test pieces, melt temperature, mold temperature, packing pressure and injection velocity as independent factors. It is expected that this correlation can be used to predict the strength of product with weld-line.
ABS has similar trend as other plastic material; that is increase on the melt temperature, mold temperature and injection velocity increase the strength of the test pieces at the weld-line, while the packing pressure has reverse effect. However, it is also found that at different piece thickness, i.e. 0.8mm, 1.0mm, 1.2mm and 2.5mm, weld-line has least strength at 1.0m, but best strength at 0.8mm.
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author2 |
Tsyr-Jang Chen |
author_facet |
Tsyr-Jang Chen Nan-Tsun Kuo 郭南村 |
author |
Nan-Tsun Kuo 郭南村 |
spellingShingle |
Nan-Tsun Kuo 郭南村 Study of Mechanical Strength of Weld-line in ABS Injection Molding Parts |
author_sort |
Nan-Tsun Kuo |
title |
Study of Mechanical Strength of Weld-line in ABS Injection Molding Parts |
title_short |
Study of Mechanical Strength of Weld-line in ABS Injection Molding Parts |
title_full |
Study of Mechanical Strength of Weld-line in ABS Injection Molding Parts |
title_fullStr |
Study of Mechanical Strength of Weld-line in ABS Injection Molding Parts |
title_full_unstemmed |
Study of Mechanical Strength of Weld-line in ABS Injection Molding Parts |
title_sort |
study of mechanical strength of weld-line in abs injection molding parts |
publishDate |
2004 |
url |
http://ndltd.ncl.edu.tw/handle/65095060059932461611 |
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