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 An Investigation on Pressure-Specific Volume–Temperature Behaviors of a Thermoplastic Under Industrial Conditions Using a Hot Runner Manifold
Tác giả hoặc Nhóm tác giả: Trieu Khoa Nguyen; Anh-Duc Pham
Nơi đăng: International Journal of Precision Engineering and Manufacturing; Số: 24(10);Từ->đến trang: 1845–1853;Năm: 2023
Lĩnh vực: Khoa học công nghệ; Loại: Bài báo khoa học; Thể loại: Quốc tế
TÓM TẮT
In the present study, a newly method for pressure-specific volume–temperature (P–V–T) behaviors of a thermoplastic in melt state was presented and experimented. To obtain the coefficients of the modified 2-domain Tait equation of state (EOS) in the melt state, the volume variation of the molten plastic in the barrel of the injection molding machine (IMM) was firstly considered at different temperatures and pressures. As the next step, specific volumes at these temperatures and pressures were calculated. And the coefficients of the modified two-domain Tait EOS in the melt state were then obtained by nonlinear regression via SPSS®. The simulation results using the experimental coefficients showed that, because of a greater slope in the molten state, the simulation using the experimental data produced 1.67% more shrinkage than the one using the data from Moldflow®. Therefore, this method showed the possibility of using an IMM together with a hot runner manifold to study the P–V–T properties of thermoplastics under industrial conditions. Hence, product defects that resulted from the characteristics of the plastic can be studied in detail on site. Furthermore, the proposed method can also be utilized to provide P–V–T data for new materials that are not yet available in the databases of simulation software solutions.
ABSTRACT
In the present study, a newly method for pressure-specific volume–temperature (P–V–T) behaviors of a thermoplastic in melt state was presented and experimented. To obtain the coefficients of the modified 2-domain Tait equation of state (EOS) in the melt state, the volume variation of the molten plastic in the barrel of the injection molding machine (IMM) was firstly considered at different temperatures and pressures. As the next step, specific volumes at these temperatures and pressures were calculated. And the coefficients of the modified two-domain Tait EOS in the melt state were then obtained by nonlinear regression via SPSS®. The simulation results using the experimental coefficients showed that, because of a greater slope in the molten state, the simulation using the experimental data produced 1.67% more shrinkage than the one using the data from Moldflow®. Therefore, this method showed the possibility of using an IMM together with a hot runner manifold to study the P–V–T properties of thermoplastics under industrial conditions. Hence, product defects that resulted from the characteristics of the plastic can be studied in detail on site. Furthermore, the proposed method can also be utilized to provide P–V–T data for new materials that are not yet available in the databases of simulation software solutions.
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