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Visualisation of SMC-Moulding
2003 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

This work is primarily focused on experimental visualisation of the flow during mould closure in compression moulding of sheet moulding compound (SMC). Circular plates are manufactured with industry scale equipment at close to production conditions. Special attention is given to the advancing flow front, for which the full complexity is captured by means of continuous high resolution close-up monitoring. From the experimental visualisation of the flow front, three phases are defined, namely pitch, floating, and boiling. During the initial phase, pitch, outer layers do not remain outer layers, the actual flow is very complex and air is likely to be entrapped. The governing process parameters during this phase are mould temperature, mould closing speed and amount of preheating in the mould. During the second phase, floating, the flow is stable and seemingly viscous. During the last phase, boiling, bubbles are observed in the low-pressure region at the flow front, favouring the void content both internally and on the surface. Based on a chemical analysis, including mass spectrometry and thermogravimetry, it is stated that everything else but styrene could be dismissed. A qualitative investigation of the surface quality of the moulded plates is carried out. It is observed that the surface void is reduced with an increased mould temperature and that the mould closing speed does not seem to have any influence on the surface quality at lower mould temperatures while at higher mould temperatures, an increased mould closing speed clearly gives a reduction of surface void. Finally a numerical model has been setup to be used in future work.

Place, publisher, year, edition, pages
Keyword [en]
Technology, SMC, Visualisation, Sheet Moulding Compound
Keyword [sv]
URN: urn:nbn:se:ltu:diva-46635ISRN: LTU-EX--03/078--SELocal ID: 442a1dbf-a51f-42e1-9d1d-258395b55696OAI: diva2:1019950
Subject / course
Student thesis, at least 30 credits
Educational program
Mechanical Engineering, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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