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RTM

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RTM

  1. 1. RESIN INJECTION MOULDING or RESIN TRANSFER MOULDING By: Prasad Mahajan
  2. 2. What is RTM?  Resin Transfer Moulding is the process of producing composite components within a mechanically-clamped, rigid, normally two-part (cope, drag) mould.  The principle behind composite manufacture is the mixing of the reinforcement with resin+catalyst mixture and the solidifying it using heat and pressure into the net shape desired.
  3. 3. Step by step procedure:
  4. 4. Diagram:
  5. 5. Recommended for:  High strength-to-weight requirements.  With very complex shape parts.  For mid-volume production in the range of 200 to 5,000 parts per year.  Gel coat can be employed for better finish on both side surface.  Usually considered an intermediate process between the relatively slow spray-up with lower tooling costs and the faster compression molding methods with higher tooling costs.
  6. 6. Materials Options:  Resins: Generally epoxy, polyester, vinylester and phenolic resins are used, although high temperature resins such as bismaleimides can be used at elevated process temperatures.  Fibres: Any stitched/woven fabric materials work well like glass fibre ,carbon fibre, aramid. Some specially developed fabrics can assist with resin flow.
  7. 7. Advantages:  High fiber volume laminates can be obtained with very low void contents.  Volatile emissions like styrene are massively reduced.  High repeatability can be achieved.  The laminate thickness can be closely controlled.  Less dependent on the skills of the operator  Automation possible.  Both sides of the component can have good finish.  Allows one to obtain even very complex neat- shape parts.
  8. 8. Disadvantages:  Matched tooling is expensive, and heavy in order to withstand pressures.  Unimpregnated areas can occur resulting in very expensive scrap parts.  Higher cycle times.  Large sized components needs very heavy and costly moulds.  Can produce some thickness variation.  Low productive.  Not possible to determine whether the reinforcement material is properly covered by the resin
  9. 9. Applications:  In complex aircraft parts  Train seats  Truck panels  Boat hulls  Wind turbine blades  Aerospace and automobile parts  Medical composites  Bathroom fixtures, car body, helmet, etc.
  10. 10. Modification (Vacuum RTM):  Also known as RTM Light.  Uses vacuum-clamped two part (male/female) matched mould  Light weight mould design  Lower cost mould  Can provide good definition and extra detail for upper moulded surface.
  11. 11. RTM Light:
  12. 12. Video :  Resin Transfer Moulding.mp4

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