FORMING OF REINFORCEMENT FORMING OF REINFORCEMENT PLASTIC 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.

PULTRUSIONPULTRUSION

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 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 A tubular component results when the resin hardened and the mandrel is withdrawn.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-UPHAND 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 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 brushFibers are arranged randomly in the panel

COMPRESSION MOULDING 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 REINFORCED REACTION INJECTION MOULDING (RRIM) 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 THERMOPLASTICSREINFORCED 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 50m.

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