Injection moulding and thermal properties of polypropylene hinges
Studies about polypropylene thermal properties have been carried out towards 2- cavities test mould of an integral hinge and tension band sample. This mould was fitted with pressure /temperature transducer and adapted with a data acquisition system. By using both injection moulding practical wo...
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| Main Author: | |
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| Format: | Thesis |
| Language: | English |
| Published: |
2008
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/7676/1/24p%20MOHD%20HILMI%20OTHMAN.pdf http://eprints.uthm.edu.my/7676/ |
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| Summary: | Studies about polypropylene thermal properties have been carried out towards 2-
cavities test mould of an integral hinge and tension band sample. This mould was fitted
with pressure /temperature transducer and adapted with a data acquisition system. By
using both injection moulding practical work and MoldFlow Plastic Insight (MPI)
simulation, the predictions and accuracy of in-mould temperature have been carried out
with different settings of processing parameters such as screw speed, shot size, mould
temperature and barrel temperature profile. These thermal properties analysis were very
important in order to produce optimum processing parameters and a better quality with
longer life span of hinges and tension band which are widely applied to product
packaging. The analysis of results showed that the measured in-mould temperature during
injection moulding practical produced the correct trend as referred to the rheological
theories of polypropylene. Through simulation process, MPI has predicted the same trend
and slightly similar in-mould temperatures as compared with data acquisition from
injection moulding practical work. For additional findings, the shot size of sample can be
minimised, with the elimination of second screw speed during packing time. This
reduction may helps to accelerate injection cycle time and reduced material consumption.
Finally, the optimum process parameter settings for hinge and tension band sample have
been rectified and verified by both simulation and practical work. It is proven that
simulation prediction able to produce beneficial results which may contribute to make
improvements in terms of numbers of trials and procedures, times / power / energy
consumption and type of materials which have been used during hinge and tension band
design and production. |
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