Effects of Barrel Temperature on Warpage and Cycle Time of Injection Molded High-Density Polyethylene �Riduwan Zakaria, Mohd Hazri Omar, Muhammad Adli Haron���
Presented by�Riduwan Zakaria
Presentation Outline
1. 0 Introduction
2.0 Methodology
3.0 Results and Discussion
4.0 Conclusion
1.0 Introduction
1.1 Research Background
1.2 Problem Statement
1.3 Objective
1.4 Literature Review
1.1 Research Background
Injection molding is a cornerstone of manufacturing and pivotal in producing a diverse array of plastic components and products
The injection molding process hinges on meticulously orchestrating multiple parameters including temperature, pressure, and injection speed. (J. Y. Chen et al., 2019; Z. Chen & Turng, 2005; Gim & Turng, 2022)
Variations or improper barrel temperature control can lead to defects in the molded components. (Adeniyi et al., 2023; Huang et al., 2022).
Understanding of the barrel temperature is pivotal in shaping the quality, consistency, and efficiency of the overall process
1.2 Problem Statement
The careful control of barrel temperature is needed to ensure the effective melting and homogenization of plastic materials and influences the entire molding process.
It is essential to observe changes in warpage and cycle time subjected to changes in the barrel temperature, which unlock the potential for consistently producing high-quality, defect-free plastic components in an efficient and cost-effective manner.
The previous study did not extensively examine the impact of the barrel temperature on the warpage and cycle time of molded part, particularly when applying Autodesk Moldflow.
1.3 Objective
To analyze the influence of barrel temperature on the warpage and cycle time of the injection molded high-density polyethylene (HDPE) using the Autodesk Moldflow software.
2.0 METHODOLOGY
2.1 Dimension of plate
Figure 1 Plate Part with a Feed System
Table 1 Dimension of Plate
Dimension (mm) | |
Length | 186.5 |
Thickness | 4 |
Width | 20 |
2.2 Properties of HDPE
Table 2 Properties of HDPE
Properties | Value | Unit |
Elastic modulus | 1037 | (MPa) |
Specific heat | 3305 (at 90°C) | (J/kg°C) |
Poisson's ratio | 0.487 | - |
Thermal conductivity | 0.341 (at 90°C) | (w/m°C) |
2.3 Relative value
2.4 Simplified Flowchart
Figure 2 Overall Process Used in the Research
3.0 Results and Discussion
3.1 Warpage (Deflection)
3.2 Cycle Time
3.1 Deflection
Figure 3 Deflection at 270°C Melt Temperature and 40°C Mold Temperature
Figure 4 Deflection at 270°C Melt Temperature and 53°C Mold Temperature
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3.1 Deflection
Figure 5 Total Deflection at Various Melt Temperature
Figure 6 Relative Deflection
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3.2 Cycle Time
Figure 7 Example of Time Responses at 270°C Melt Temperature. (a) 40°C Mold Temperature, (b) 53°C Mold Temperature
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(a)
(b)
3.2 Cycle Time
Figure 8 Fill, Cooling and Cycle Time at Various Melt Temperature. (a) Mold Temperature of 40°C (b) Mold Temperature of 53°C
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3.2 Cycle Time
Figure 9 Relative Value of Cycle Time
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4.0 Conclusion
Conclusion
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| A direct correlation between melt temperature and both deflection and cycle time, indicating a linear increase with higher melt temperatures | |
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| Linear Increase | |
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| The highest relative value, approximately 20% in cycle time, occurs at the maximum melt temperature of 270°C. The impact on deflection is relatively modest, with a relative value around 3% | |
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| Relative Value | |
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| These findings underscore the importance of considering variations in melt temperature during the injection molding process, both in developmental stages and in practical applications | |
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| Importance of Melt Temperature | |
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Thank you..
Q&A