Resin transfer moulding, manufacturing of composites

1. PRESENTATION ON
RESIN TRANSFER
MOLDING(RTM)
Presented By:
Hanumant Singh,Tushar
Gupta,Vishal Vyas,Shweta
Submitted To:
Sunil Singh Godara Sir

2. CONTENTS
History
Resin Transfer molding set up and description
Advantages
Disadvantages
Type of material for which process is used
Properties of the material which affect by RTM process
Applications of resin transfer molding

3. HISTORY
developed by a US navy contract for the development
of 28-ft long personal boat in 1946
Harold John Pollard and John Rees in between 1952 – 1956
plant for fibers and asbestos
fully developed for general aerospace applications in the 1980s
Types :- LCM,RIM,SRIM,RRIM,RTM

4. RTM SET UP

5. STEPS IN RTM PROCESS

6. Typical Preform Fiber Weaves
Polyester resins
Epoxy resins
Phenolic resins and other thermo set resins
Type of material for which process is used

7. Advantages
Design Flexibility
Faster Production
Labor Savings
Dimensional Tolerances
Surface Finish
Lower Material Wastage
Very large and complex shapes can be made efficiently

8. Disadvantages
Greater Tooling Design and Construction Skills Required
Higher Tool Cost
Reinforcement loading may be difficult with complex parts
Mold design is complex

9. Properties of the material which affect by
RTM process
Density
Strength
Notched and Unnotched lzod Impact Strength increases

12. Aerospace parts
boat hulls
wind turbine blades
aircraft radar.
helmet, bathroom fixtures, car body etc.

13.  May or may not take place under vacuum (assists in
minimizing air entrapment).
 Mixer/injection head is inserted into mold.
 Injection pressure pushes check valve off its seat and
allows resin to begin filling.
 Air is pushed ahead of resin.

14. Contd…
 Resin will begin flowing from vent ports-
1. If part design is simple may be full
2. If part design complex, may require slight overfill to vent all
air
 Vent ports are pinched off and internal pressure causes inlet
check valve to close

15. Reinforcement used in RTM
TYPE:
E-glass, S-glass
Carbon/Graphite
Aramid
FORM:
Matrices
Fabric
Textile preform architecture (knitted, braided, 3-D
stitched)
PREFORMS:
Preshaping of reinforcement

16. RTM Process Issues
 Critical to control infusion rate and flow front of resin so that
it infiltrates fibre preform evenly and completely, but quickly
before gelling.
 Resin is injected in centre of part to guard against formation
of air pockets and minimize distance resin must travel.
 Care must be exercised to insure reinforcement does not
move during injection (fibre wash).