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PULTRUSION PROCESS

 INTRODUCTION
  • Pultrusion process is the type of closed mould processes.


  • It is used for producing fiber reinforcement plastic of constant cross section such as I-beam, tube, pipes etc.



  • The above figure shows that Pultrusion process.


  • It consists of roller, tank which containing plastic resin, heated die and soon.


WORKING
  • Fibres are drawn from spools through uncured resin bath for impregnation.


  • Then impregnated fibres are first fed into a pre-forming box which gives appropriate orientation to the fibres.


  • These oriented fibres are then fed into a heated steel die, where polymerisation and curing takes place, and also determines the cross section of composite stock.


  • After that pulling operation.(continuous length of consent cross-section can be drawn through die.


 Reinforcement used in Pultrusion

  • E-Glass, S-Glass /Carbon /Graphite/Aramid reinforcement are used.The forms either roving or mat or fibres.


Resins used in Pultrusion

  • The resin should have low viscosities (500cps) and also should have ability to cure quickly.Some resin are---


  • Polyester


  • Vinyl ester resin etc.


Advantages

  • High production rate of “finished parts”.


  • High material usage.


  • Complex thin walled shapes can be fabricated.


Disadvantages

  • Cross section must be uniform.


  • Difficult to maintain tight tolerances.

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