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Automotive Production Engineering; Glasses Somsak Siwadamrongpong 2/2552
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Contents Glass properties Chemical, Physical and Optical properties Glass structure Automotive glasses Tempered glasses Zoned tempered glasses Laminated Glasses Automotive glass production
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Glass Properties General properties of glasses High hardness / Brittle Low density compared to high strength Low thermal expansion coefficient Low heat / electrical conductivity High melting point Good chemical resistance / Chemical inert Wide range of optical transmission Transparent Translucent Opaque
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Optical transmission
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Glass transition temperature; Tg By TMA: Thermal Mechanical Analysis
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Glass transition temperature; Tg By DSC: Differential Scanning Calorimetry
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Glass Applications
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Popular Glasses Silicate glasses Soda lime silicate Aluminosilicate Borosilicate Phosposilicate Chalcogenide glasses Fluoride glasses Ceramic Glaze
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Glass structure; silicate (SiO 2 ) Crystalline Amorphous
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Glass structure; silicate (SiO 2 ) Tetrahedral SiO 2
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: Vitreous silica (SiO 2 ) O O Si O O O O O O O O O O O O O O O O O Each Si tetrahedron links to 4 tetrahedra by sharing corner with each other All oxygen are presence as bridging oxygen (BO) Glass structure; silicate
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: Binary silicate glass (6SiO 2 -2Na 2 O) O O-O- Si O O Na + O O Si O O-O- O O O O O O O O O O O O-O- Na + O-O- Network linkage is broken as entering of network modifier Non-bridging oxygen (NBO) is initiated and its charge is compensated with the metal cation Glass structure; silicate
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: Ternary alumino-silicate glass (6SiO 2 -Al 2 O 3 -2Na 2 O) O-O- Al O OO O - Na + O Si O O O O O O O O O O O O O OO-O- Na + O Al O OO O - Network consists of Si and Al tetrahedra Metal cation is compensated by AlO 2 - and the excess cation will break the network and compensate with NBO Glass structure; silicate
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2+ O Si Ca Al Glass structure; silicate : Ternary alumino-silicate glass (SiO 2 -Al 2 O 3 -CaO) system
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Window glasses
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Automotive Glasses Tempered glasses / Zoned tempered glasses Used for side and rare glasses Laminated glasses Used for front glass Other glasses UV / IR cut glass Privacy glass Water repelling glass
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Tempered glasses further cooled tension compression before cooling hot surface cooling hot cooler Strength increase 3-5 times of annealed glasses
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Tempered glasses Zone tempered glass Tempered glass
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Laminated Glasses PVB = Polyvinyl Butyral Interlaying Film
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Glass Production Raw Materials Flat Glass Tempered Glasses Laminated Glasses Sand powder (SiO 2 ), Al 2 O 3, Na 2 O, CaO, MgO Floating Technique For construction, panel automotive and others
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Flat Glass Production
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Floating Technique
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A A Section A-A
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Floating Technique
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Flat Glass Production Line
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Glass Tempering Processes
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Washing / Drying Section Laminating / Heating Section
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Tempered Glass’s Temperature Inspection
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Glass Laminating Processes
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Inspection, Packing
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Glass Laminating Processes
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Pre-Processes for Glass Laminating
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Glass Laminating Processes Post-Processes for Glass Laminating
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Q&AQ&A
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