Dissolution of voids during compression moulding of SMC

Document identifier: oai:DiVA.org:ltu-7722
Access full text here:10.1177/0731684409336369
Keyword: Engineering and Technology, Mechanical Engineering, Fluid Mechanics and Acoustics, Teknik och teknologier, Maskinteknik, Strömningsmekanik och akustik, Strömningslära, Fluid Mechanics
Publication year: 2010
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Abstract:

During compression molding of sheet molding compounds air bubbles are formed that can deteriorate several properties of the final composite. The story of such bubbles is directly set by the local pressure distribution during pressing. A number of experiments have therefore been performed in order to derive the relation between the pressure and dissolution rate of some gases into relevant resins. The experimental results follow Henry's law up to a pressure of 0.7 MPa and the rate of dissolution is highest for CO2 in pure polyester. When applying the results to the process in focus it is found that even large bubbles can be dissolved into the liquid resin during manufacturing. Hence, there is a potential to produce parts with very low void content.

Authors

Staffan Lundström

Luleå tekniska universitet; Strömningslära och experimentell mekanik
Other publications >>

Allan Holmgren

Luleå tekniska universitet; Strömningslära och experimentell mekanik
Other publications >>

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        identifier: oai:DiVA.org:ltu-7722
        datestamp: 2021-04-19T12:21:06Z
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                version: 3.7
            recordInfo: 
                recordContentSource: ltu
                recordCreationDate: 2016-09-29
            identifier: 
                http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-7722
                10.1177/0731684409336369
                2-s2.0-77954071551
                6242a2c0-67fb-11de-9f57-000ea68e967b
            titleInfo: 
                @attributes: 
                    lang: eng
                title: Dissolution of voids during compression moulding of SMC
            abstract: 
During compression molding of sheet molding compounds air bubbles are formed that can deteriorate several properties of the final composite. The story of such bubbles is directly set by the local pressure distribution during pressing. A number of experiments have therefore been performed in order to derive the relation between the pressure and dissolution rate of some gases into relevant resins. The experimental results follow Henry's law up to a pressure of 0.7 MPa and the rate of dissolution is highest for CO2 in pure polyester. When applying the results to the process in focus it is found that even large bubbles can be dissolved into the liquid resin during manufacturing. Hence there is a potential to produce parts with very low void content.

            subject: 
                    @attributes: 
                        lang: eng
                        authority: uka.se
                    topic: 
                        Engineering and Technology
                        Mechanical Engineering
                        Fluid Mechanics and Acoustics
                    @attributes: 
                        lang: swe
                        authority: uka.se
                    topic: 
                        Teknik och teknologier
                        Maskinteknik
                        Strömningsmekanik och akustik
                    @attributes: 
                        lang: swe
                        authority: ltu
                    topic: Strömningslära
                    genre: Research subject
                    @attributes: 
                        lang: eng
                        authority: ltu
                    topic: Fluid Mechanics
                    genre: Research subject
            language: 
                languageTerm: eng
            genre: 
                publication/journal-article
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                Published
                2
                Validerad; 2010; 20090703 (stlu)
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                        authority: ltu
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                        Lundström
                        Staffan
                    role: 
                        roleTerm: aut
                    affiliation: 
                        Luleå tekniska universitet
                        Strömningslära och experimentell mekanik
                    nameIdentifier: 
                        stlu
                        0000-0002-1033-0244
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                        type: personal
                        authority: ltu
                    namePart: 
                        Holmgren
                        Allan
                    role: 
                        roleTerm: aut
                    affiliation: 
                        Luleå tekniska universitet
                        Strömningslära och experimentell mekanik
                    nameIdentifier: allan
            originInfo: 
                dateIssued: 2010
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                    type: host
                titleInfo: 
                    title: Journal of reinforced plastics and composites (Print)
                identifier: 
                    0731-6844
                    1530-7964
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                    detail: 
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                                type: volume
                            number: 29
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                                type: issue
                            number: 12
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