Evaluation of shrinkage and weld line strength on thick flat part in injection moulding process

Master of Science in Manufacturing Engineering

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Bibliographic Details
Main Author:	Mohd Nasir, Mat Saad
Other Authors:	Khairul Azwan, Ismail, Assoc. Prof. Dr.
Format:	Thesis
Language:	English
Published:	Universiti Malaysia Perlis (UniMAP) 2016
Subjects:	Injection molding of plastics Concrete > Expansion and contraction Materials > Mechanical properties
Online Access:	http://dspace.unimap.edu.my:80/xmlui/handle/123456789/77176
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Institution:	Universiti Malaysia Perlis
Language:	English

id	my.unimap-77176
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spelling	my.unimap-771762022-11-24T07:44:16Z Evaluation of shrinkage and weld line strength on thick flat part in injection moulding process Mohd Nasir, Mat Saad Khairul Azwan, Ismail, Assoc. Prof. Dr. Injection molding of plastics Concrete -- Expansion and contraction Materials -- Mechanical properties Master of Science in Manufacturing Engineering Mechanical properties such as strength of moulded part is critical predominantly for parts that require a sufficient strength for the functionality of the product. One of the main concerns that affects the mechanical properties is weld line defect which occurs when two or more gates are used during the injection moulding process. In addition, the dimensions of the part are also crucial in terms of precision of the product. Thus, the shrinkage of the moulded parts also needs to be controlled. Most of the previous studies focus on the weld line strength or the shrinkage of the moulded part separately and it is rare to find studies that incorporate both of these aspects. Therefore, the current study evaluates both shrinkage and strength of weld line using Design of Experiment (DOE) and Response Surface Methodology (RSM) in multi-objectives optimisation utilizing the injection moulding parameters. The mould was successfully designed and fabricated complete with gating system, cooling system, core and cavity of a thick flat part based on ISO standard. The variable parameters used in this study are coolant inlet temperature, melt temperature, packing pressure and cooling time. Simulation process was conducted to determine the recommended setting of injection moulding parameters and the range of the variable parameters. The acceptable range of coolant inlet temperature was set between 50°C and 70°C, while the melt temperature was between 250°C and 270°C. The range of packing pressure was set between 50 MPa to 70 MPa and cooling time between 8 s and 12 s. Experimental works were conducted according to the experimental design where regression models were established to predict the shrinkage and weld line strength. An optimal setting parameter of the process was established to achieve the optimum shrinkage and weld line strength of the moulded part. The results of shrinkage and weld line strength using an optimal setting after optimisation process were compared with the results obtained using the recommended setting. It was found that, the shrinkage in the normal and parallel directions to the melt flow were reduced by 5.97 % and 4.91 % by predicted model generated using RSM. On the other hand, the weld line strength was improved by 3.76 % as compared to the weld line strength obtained from the recommended setting. 2016 2022-11-24T07:41:53Z 2022-11-24T07:41:53Z Thesis http://dspace.unimap.edu.my:80/xmlui/handle/123456789/77176 en Universiti Malaysia Perlis (UniMAP) Universiti Malaysia Perlis (UniMAP) School of Manufacturing Engineering
institution	Universiti Malaysia Perlis
building	UniMAP Library
collection	Institutional Repository
continent	Asia
country	Malaysia
content_provider	Universiti Malaysia Perlis
content_source	UniMAP Library Digital Repository
url_provider	http://dspace.unimap.edu.my/
language	English
topic	Injection molding of plastics Concrete -- Expansion and contraction Materials -- Mechanical properties
spellingShingle	Injection molding of plastics Concrete -- Expansion and contraction Materials -- Mechanical properties Mohd Nasir, Mat Saad Evaluation of shrinkage and weld line strength on thick flat part in injection moulding process
description	Master of Science in Manufacturing Engineering
author2	Khairul Azwan, Ismail, Assoc. Prof. Dr.
author_facet	Khairul Azwan, Ismail, Assoc. Prof. Dr. Mohd Nasir, Mat Saad
format	Thesis
author	Mohd Nasir, Mat Saad
author_sort	Mohd Nasir, Mat Saad
title	Evaluation of shrinkage and weld line strength on thick flat part in injection moulding process
title_short	Evaluation of shrinkage and weld line strength on thick flat part in injection moulding process
title_full	Evaluation of shrinkage and weld line strength on thick flat part in injection moulding process
title_fullStr	Evaluation of shrinkage and weld line strength on thick flat part in injection moulding process
title_full_unstemmed	Evaluation of shrinkage and weld line strength on thick flat part in injection moulding process
title_sort	evaluation of shrinkage and weld line strength on thick flat part in injection moulding process
publisher	Universiti Malaysia Perlis (UniMAP)
publishDate	2016
url	http://dspace.unimap.edu.my:80/xmlui/handle/123456789/77176
_version_	1753972991832621056

Evaluation of shrinkage and weld line strength on thick flat part in injection moulding process

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