Fibrereinforced plastic COMPOSITE PLASTICS Fibrereinforced plastic For small
Fibre-reinforced plastic COMPOSITE PLASTICS
Fibre-reinforced plastic Ø For small objects plastics are resistant enough Ø For bigger objects plastics are too weak Ø We can use plastics for big objects if we increase their resistance Ø The best way is adding fibres to the plastics
Used polymers Thermosetting resins: Ø Epoxy Ø Vinylester Ø Polyester Ø Phenol formaldehyde
Used fibres Ø Glass Ø Basalt Ø Aramid Ø Carbon Fibres must be sized (coated with a chemical substance to make sure the fibres will be sticky with the resins).
Fibres availability Mat Woven Unidirectional
Mould Ø We need a mould with the shape of the object we want build Ø The surface of the object in direct contact with the mould will be smooth. The other side will be rough Ø We can choose a female or a male mould
Female mould Ø The outer surface of the object will be smooth
Male mould Ø The inner surface of the object will be smooth
Release agent Is used to prevent the object bonding to the mould Ø Wax Ø Paraffin Ø Polyvinyl alcohol Ø Silicone
Construction 1. 2. 3. 4. 5. 6. 7. Apply a release agent layer Apply a gel coat layer Put a layer of fibre when the gel coat polymerizes Apply the resin using a roller Repeat the steps 4 & 5 until you get the right thickness Wait until the resin polymerizes (curing time) Extract the piece from the mould
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