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Wednesday, February 2, 2011

RTM Variant : Light RTM

LRTM process for composites is best described as a complimentary process to RTM (Resin Transfer Moulding). LRTM mould costs are basically half the price of equivalent RTM moulds but they produce, at best, at half the rate of RTM however the process provides molders an attractive introductory route into closed mould production.

In LRTM, resin flow rates cannot be speeded up above an optimum level in order to fill the mould more quickly as the recommended LRTM mould construction and the atmospheric mould clamping pressures limit overall in-mould pressures to less than 0.5 bar (8 psi).

As with any composite closed mould production technique LRTM is no exception to the rule in demanding high quality accurate composite moulds in order to provide good mould life and consistent production of good parts.

LRTM is now well established as an alternative FRP/GRP moulding technique and we encourage any traditional hand lay moulder starting up in LRTM to ensure their mould build technology, equipment and parts for LRTM are acquired from professional sources.

The advantages of closed molding for either true RTM or RTM Light, offers working environments for the molding operators that are far more comfortable and healthy. They then are willing to apply their skills of quality and productivity at a consistently higher level each day. Even though it is true that RTM Light will not yet meet the production rates that are enjoyed in traditional RTM, RTM Light will provide a 300 to 400% increase in per square foot productivity over open mold, with significant improvement of bill of material compliance and lower operator employment turnover.

Process Flow of Light Resin Transfer Moulding (LRTM)

Source : Magnum Venus Plastech (MVP), their website is

Ps: I have attended training organized by MVP on building a RTM mould. It was very helpful and informative. Their trainer, Mr Charles is a very friendly and skillfull person. I also met him at JEC composite Asia Show in Singapore while he at MVP booth.


John said...

The most recognized supplier of Light RTM technology in North America is JHM Technologies located in Fenton Michigan USA. You can visit JHM at there you will find a host of videos for training, professional Injection systems, Mold building Supplies as well over 40 pages of technical information on the RTM and Light RTM process methods. Ph: 810-629-6515

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