Optimization of Injection Pressure and Time of Injection Molding for Eye Drop Heads

Ichlasul Insani, Andoko Andoko, Yanuar Rohmat Aji Pradana


Injection molding is a plastic production process by injecting liquid plastic into a mold. One of the injection molding products is an eye drop head. Eye drops in its production experienced rejects reaching 37.5% due to defects. The purpose of this optimization is to obtain the optimum setting of injection pressure and time of injection molding machine using RSM. The method to achieve the goal through finite element approach with pre-processing includes design and setting boundary conditions for injection pressure (10.5, 11, and 11.5 MPa) and injection time (1.9, 2.0, and 2.1 seconds). Post processing displays the results of product mass, defects, and quality prediction which are further optimized using RSM to obtain optimum values. The simulation results show that higher injection pressure and lower injection time have given satisfactory results for all three parameters (product mass, defects, and quality prediction) observed. Based on the optimization results, the optimal injection molding settings were obtained at an injection pressure of 11.5 MPa and injection time of 1.9 seconds which resulted in a product mass of 0.429 g, weld line defect of 0.1384, and quality prediction of 80.9%.


Injection Molding; Optimization; Injection Pressure; Injection Time; RSM

Full Text:



M. Kutz, Applied Plastics Engineering Handbook. Elsevier, 2011. doi: 10.1016/C2010-0-67336-6.

S. Ersoy, “Plastic Injection Machine,” 2014.

D. Cahyadi, “Analisis Parameter Operasi Pada Proses Plastik Injection Molding Untuk Pengendalian Cacat Produk,” J. Mesin Teknol., vol. 8, no. 2, hlm. 8–16, 2014.

M. Firdausi dan F. Ramdani, “BARREL PADA PROSES PRODUKSI MENGGUNAKAN,” no. 2, hlm. 69–74, 2020.

C. Budiyantoro, A. Nugroho, dan U. M. Yogyakarta, “Effect of Mould and Melt Temperature on The Properties of Styrene Acrylonitrile Moulded Parts,” vol. 3, no. 1, hlm. 7–14, 2018.

E. Farotti dan M. Natalini, “Injection molding. Influence of process parameters on mechanical properties of polypropylene polymer. A first study.,” Procedia Struct. Integr., vol. 8, hlm. 256–264, Jan 2018, doi: 10.1016/j.prostr.2017.12.027.

H. Hassan, “An experimental work on the effect of injection molding parameters on the cavity pressure and product weight,” hlm. 675–686, 2013, doi: 10.1007/s00170-012-4514-4.


D. Wahjudi dan R. Alimin, “Aplikasi Rekayasa Mutu untuk Mengurangi Cacat pada Mesin Injection Aplikasi Rekayasa Mutu untuk Mengurangi Cacat pada Mesin Injection Molding,” no. June 2014, 2004.

J. Wang, Q. Mao, N. Jiang, dan J. Chen, “Effects of Injection Molding Parameters on Properties of Insert-Injection Molded Polypropylene Single-Polymer Composites,” Polymers, vol. 14, no. 1, Art. no. 1, Jan 2022, doi: 10.3390/polym14010023.

P. Bharti, M. Khan, dan S. Harbinder, “Recent methods for optimization of plastic injection molding process—a retrospective and literature review,” Int. J. Eng. Sci. Technol., vol. 2, Sep 2010.

Y. Hendronursito, T. O. Rajagukguk, A. Anshori, dan A. Yunanto, “Optimization of Stir Casting of Aluminum Matrix Composites (AMCs) with Filler of Recycled Glass Powder (RGP) for The Mechanical Properties,” J. Mech. Eng. Sci. Technol. JMEST, vol. 4, no. 2, Art. no. 2, Nov 2020, doi: 10.17977/um016v4i22020p101.

DOI: https://doi.org/10.26905/jtmt.v19i2.10022


  • There are currently no refbacks.


Universitas Merdeka Malang

Mailing Address:

Jalan Terusan Dieng 62-64 Malang, 65146, East Java, Indonesia
Phone: 081333961913 Fax: (0341) 560836
Email: jm.transmisi@unmer.ac.id