Full Text Available
Note: Clicking the button above will open the full text document at the original institutional repository in a new window.
The simulation of the flow of polymer melt in lomolding
Thesis (MScIng)--University of Stellenbosch, 2004.
Saved in:
| Main Author: | |
|---|---|
| Other Authors: | |
| Format: | Thesis |
| Language: | en_ZA |
| Published: |
2011
|
| Subjects: | |
| Tags: |
No Tags, Be the first to tag this record!
|
| _version_ | 1867613828106158080 |
|---|---|
| access_status_str | Open Access |
| author | Dymond, Jacques Andrew Dryden |
| author2 | Basson, A. H. |
| author_browse | Basson, A. H. Dymond, Jacques Andrew Dryden |
| author_facet | Basson, A. H. Dymond, Jacques Andrew Dryden |
| author_sort | Dymond, Jacques Andrew Dryden |
| collection | Thesis |
| description | Thesis (MScIng)--University of Stellenbosch, 2004. |
| format | Thesis |
| id | oai:scholar.sun.ac.za:10019.1/16318 |
| institution | Stellenbosch University (South Africa) |
| language | en_ZA |
| last_indexed | 2026-06-10T12:42:19.474Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from SUNScholar — Stellenbosch University Repository |
| publishDate | 2011 |
| publishDateRange | 2011 |
| publishDateSort | 2011 |
| record_format | dspace |
| source_str | SUNScholar — Stellenbosch University Repository |
| spelling | oai:scholar.sun.ac.za:10019.1/16318 The simulation of the flow of polymer melt in lomolding Dymond, Jacques Andrew Dryden Basson, A. H. University of Stellenbosch. Faculty of Engineering. Dept. of Mechanical and Mechatronic Engineering. Injection molding of plastics Shear (Mechanics) Machine design Theses -- Mechanical engineering Dissertations -- Mechanical engineering Thesis (MScIng)--University of Stellenbosch, 2004. ENGLISH ABSTRACT: Lomolding is a new process similar to injection moulding. In this thesis a numerical model of the polymer flow into the cavity is presented. The model is used to compare the two processes with each other. Lomolding and injection moulding were modelled numerically with the finite element method. The model was an axisymmetric model and takes phenomena such as generalised Newtonian flow, free surfaces, moving boundaries and solidification into account. The processes’ characteristics that were compared are the cavity pressure, shear rate and shear stress. Improvements in these characteristics will result in lomolding having smaller machines, less fibre breakage and a better potential for in-mould-decoration. The thesis shows that lomolding has substantially lower shear rates and shear stresses than injection moulding. The model was also used to investigate certain machine design aspects, and to gain a better understanding of the polymer flow in lomolding. AFRIKAANSE OPSOMMING: Lomoldering is ’n nuwe proses soortgelyk aan inspuitgiet. Hierdie tesis beskou ’n numeriese model van die polimeervloei soos dit in die gietholte invloei. Die model word gebruik om die twee prosesse met mekaar te vergelyk. Lomoldering en inspuitgiet is numeries gemodeleer met die eindige-elementmetode. Die model is aksiaal-simmetries en neem verskynsels soos Newtoniese vloei, vrye oppervlakke, bewegende grense en stolling in ag. Die proses-karakteristieke wat vergelyk is, sluit die gietholtedruk, vervormingstempo en skuifspanning in. Verbeterings in hierdie karakteristieke sal meebring dat lomoldering kleiner masjiene nodig sal hê, minder veselskade sal veroorsaak en meer versoenbaar met in-gietholte-versierings sal wees, vergeleke met inspuitgiet. Die tesis toon dat lomoldering laer vervormingstempo’s en skuifspanning het, in vergelyking met inspuitgiet. Die model is ook gebruik om sekere masjienontwerpaspekte te ondersoek, en om die polimeervloei in lomoldering beter te verstaan. 2011-08-29T13:59:15Z 2011-08-29T13:59:15Z 2004-12 Thesis http://hdl.handle.net/10019.1/16318 en_ZA xviii, 131 leaves : ill. application/pdf |
| spellingShingle | Injection molding of plastics Shear (Mechanics) Machine design Theses -- Mechanical engineering Dissertations -- Mechanical engineering Dymond, Jacques Andrew Dryden The simulation of the flow of polymer melt in lomolding |
| title | The simulation of the flow of polymer melt in lomolding |
| title_full | The simulation of the flow of polymer melt in lomolding |
| title_fullStr | The simulation of the flow of polymer melt in lomolding |
| title_full_unstemmed | The simulation of the flow of polymer melt in lomolding |
| title_short | The simulation of the flow of polymer melt in lomolding |
| title_sort | simulation of the flow of polymer melt in lomolding |
| topic | Injection molding of plastics Shear (Mechanics) Machine design Theses -- Mechanical engineering Dissertations -- Mechanical engineering |
| url | http://hdl.handle.net/10019.1/16318 |
| work_keys_str_mv | AT dymondjacquesandrewdryden thesimulationoftheflowofpolymermeltinlomolding AT dymondjacquesandrewdryden simulationoftheflowofpolymermeltinlomolding |