Experimental analysis on the effects of pigmentation in the defects formation of the polypropylene plastic injection moulding

V. Kausalyah*, E. N. M. Nik Maisara, S. Shasthri

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

1 Citation (Scopus)
158 Downloads (Pure)


Pigment levels are known to have an effect on defect formation of the plastic injection moulding parts. Warpage, Shrinkage and Flash are common defects that were found during plastic injection moulding process. It was found that the pigment does play a role in the formation of defects on the plastic injection moulding parts. The main finding of this case study is to analyse and study the warpage, shrinkage and flash defects that were found in the Plastic Injection Moulding (PIM) parts which are moulded with different pigmentation percentages. It is also to identify the effects of the different pigments colours on the moulding quality of the parts when the pigment percentage is made constant. In this research, the dog bone design was used as the experimental specimen. The material used in this study is Polypropylene (PP). The other parameters such as injection pressure, melting temperature and cooling time were set to constant. The only parameter that varies is percentage of pigmentation. Warpage, Shrinkage and Flash defects are measured and calculated to obtain the value of defects. The pigmentation gives a huge effect on Warpage and Flash deformation. The warping and flash increase as the percentage of pigmentation increase. The highest value for warpage and flash are 3.0732 and 1.45304 respectively. Moreover, blue pigment gives the lowest value for Warpage and Flash defect. While yellow has the highest warping and flash defects. However, it was found that shrinkage is not affected by the pigmentation. The shrinkage result is less than 1%.

Original languageEnglish
Article number012038
JournalIOP Conference Series: Materials Science and Engineering
Publication statusPublished - 22 Jun 2020
Event6th International Conference on Advances in Mechanical Engineering 2019 - Kota Kinabalu, Sabah, Malaysia
Duration: 14 Aug 201916 Aug 2019

ASJC Scopus subject areas

  • General Materials Science
  • General Engineering


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