FORMING OF REINFORCEMENT PLASTIC

1
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.

2
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.

3
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  resin hardened and the mandrel is withdrawn.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.

4
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.

5
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

6
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.

7
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

8
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.

9
Thank You

• See You Next Lecture