FORMING OF REINFORCEMENT PLASTIC For the manufacturing of a component from a reinforced plastic, the forming process does more than shaping, it also positions the reinforcing particles and fix orientation.

PULTRUSION Continuous fibre roving are handled through a bath of resin and then through a shaping die. The resin then cross-links and hardness, producing a long prismatic component with fibre aligned uniaxially parallel to its long axis.

FILAMENT WINDING Continuous fibre roving are pulled through a bath of resin and are then wound on to a driven “mandrel”. A tubular component results when the resin hardened and the mandrel is withdrawn. The fibers are in an angle-ply arrangement. The process used for producing pipes and cylindrical vessels. Other winding geometries can be produced also, either uniaxially or more complex fibre arrangements.

HAND LAY-UP Fiber reinforcement is laid down by hand in the required arrangement and shape and resin is applied with a brush Reinforcement can be in the form of roving, a woven roving fabric, or a mat of randomly arranged chopped fibers. This method is very versatile but labor intensive Used for short production runs. Ex. Building of small boats.

HAND SPRAY-UP Roving are fed to a spray gun, which chops the fibers and the sprays them at the panel where reinforcement is needed. Resin is also applied with a brush Fibers are arranged randomly in the panel

COMPRESSION MOULDING Fibre and resin are premixed and additives are added. Prior to compression moulding in a heated mould which triggers the hardening of the resin. Many forms of premix are available, making a variety of fibre arrangements possible.

REINFORCED REACTION INJECTION MOULDING (RRIM) Liquid precursors are mixed (one of them already containing short fibers. Liquid is injected into a close mould. Fibers arrangement are influenced by the flow of the simultaneously cross linking polymer. The arrangement is random in three dimension

REINFORCED THERMOPLASTICS Forming is carried out using the normal process of extrusion or injection moulding Alignment of the reinforcement is caused by drag exerted on the particles by the flowing viscous polymer melt. Damage is done to reinforcing particles during passage through the thermoplastic compounding ex. Fibre length reduced to 0.5 mm. Platelet also breakdown to 50  m.

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