| Autor: |
Haonan Wu, Jianhui Qiu, Guohong Zhang, Eiichi Sakai, Wei Zhao, Jianhua Tang, Hong Wu, Shaoyun Guo |
| Předmět: |
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| Zdroj: |
Polymer Engineering & Science; Oct2023, Vol. 63 Issue 10, p3313-3327, 15p |
| Abstrakt: |
Injection molding is a widely used method for production of plastic components, offering both simplicity and high strength. In this study, secondary injection molding was utilized to weld polyamide 6 (PA6). The welded samples were evaluated for the welding strength via a shear tensile test. Three process parameters of mold temperature, injection temperature, and injection speed were varied to determine the optimal conditions for welding. A polarizing microscope analysis of the welding interface revealed formation of a shish kebab layer (SKL) structure, which significantly contributed to the welding strength. A differential scanning calorimetry analysis of the welded samples showed that changes in the crystallinity at the interface were closely related to the welding strength under different injection molding conditions. To analyze the crystal phase of the interface after welding, we propose the use of Fourier-transform infrared spectroscopy area scanning to obtain the relationship between the phase transformation and welding strength. Additionally, microhardness testing is proposed as a means of evaluation of the welding effect. Overall, this study highlights the importance of optimization of process parameters in secondary injection molding to achieve strong welds in PA6, where the SKL structure and crystallinity changes at the interface have crucial roles. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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