Universal Journal of Mechanical Engineering Vol. 2(9), pp. 280 - 286
DOI: 10.13189/ujme.2014.020902
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Effect of CaCO₃ Additive on the Warpage of Injection Molding Part

Pham Son Minh ^1,*, Phan The Nhan ^2
1 University of Technical Education, Ho Chi Minh City, Vietnam
² Ho Chi Minh Vocational College of Technology, HCM City, Vietnam

ABSTRACT

In injection molding process, improving the part quality by reducing the warpage is an issue, especially with the thin-walled product. In this paper, the injection molding process was applied to a rectangular plate of 150 mm x 30 mm. The part thickness was varied from 1.0 mm to 2.5 mm. Three types of material as polypropylene (PP), acrylonitrin butadiene styrene (ABS), and polyvinyl chloride (PVC) were selected for observing the influence of volume shrinkage ratio on the warpage. Then, different weight ratios of CaCO₃ (10%, 20%, 30%, and 40%) additive were mixed with the PP material and then, the mixture was molded. The result shows that the volume shrinkage ratio of plastic material has a strong influence on the part warpage with the thickness of 1.0 mm, 1.5 mm, and 2.0 mm. However, with the thickness of 2.5 mm, the different warpage under three types of plastic is not strongly. With the CaCO₃, the result shows that the more the CaCO₃ additive, the lesser is the part warped. However, with a thickness of 2.5 mm, the CaCO₃ has a negative influence on the warpage. In addition, this research was achieved by both simulation and experiment. The comparison shows that the simulation result and experiment result agree well.

KEYWORDS
Injection Molding, Warpage, Shrinkage, Plastic Additive

Cite This Paper in IEEE or APA Citation Styles
(a). IEEE Format:
[1] Pham Son Minh , Phan The Nhan , "Effect of CaCO₃ Additive on the Warpage of Injection Molding Part," Universal Journal of Mechanical Engineering, Vol. 2, No. 9, pp. 280 - 286, 2014. DOI: 10.13189/ujme.2014.020902.

(b). APA Format:
Pham Son Minh , Phan The Nhan (2014). Effect of CaCO₃ Additive on the Warpage of Injection Molding Part. Universal Journal of Mechanical Engineering, 2(9), 280 - 286. DOI: 10.13189/ujme.2014.020902.