Vacuum RTM (VRTM, RTM Light) Demo

A simple demonstration of the Vacuum RTM process.
The video shows the operation of a typical composite VRTM mould.
The mould is clamped using atmospheric pressure (vacuum) and is then injected with resin at low pressure using a Ciject injection machine.
The resin is injected into a peripheral channel that allows it to flow around the outer edge of the moulding and then fill towards a central vent point (fitted with a catch-pot)
For more information please contact [e-mail]

[@Compositeinteg1]

The blue material that you can see on the top mould half are the silicone seals. The upper mould includes two seals; an outer vacuum seal and an inner resin seal. Vacuum is connected to the area between these seals and to the mould cavity (via the central catch-pot) I hope this helps.

[@MrUltracoin]

hello nice video, what material is that blue tape that you use op the top half, to make a vacuum flange?

[@vishalkanojiya2055]

How much apply vaccume in the catchpot and flange

[@MrUltracoin]

Would this exact mold type still work with infusion? (2 hard shells instead of 1 hard mold and a flexible silicone vacuumbag).

[@Compositeinteg1]

Koen KlijnsmitThis mould doe have two hard shells. The process would also work with a flexible silicone upper mould but the definition of the 'B' surface would not be as good.

[@masoudhaghikashani4892]

Thanks for sharing this video, so informative. We are doing some LRTM process tests. In some cases, we observed a strange thing. Once we observe that the resin completely fills the cavity and comes up from the outlet valve and moves through a hole to the excess resin catch pot, we stop the resin injection. Then, we observed that the resin in the mold is sucked out to the excess resin catch pot. In other words, while we disconnected the resin supply, we observe resin flow in the hose which connects the outlet to the excess resin catch pot. In fact, some amount of resin does not stay in the cavity and moves to the catch pot. Have you had any similar experience? Thanks in advance for your advice.

[@Compositeinteg1]

Hi Masoud, from your description it sounds like there must be a vacuum leak into your mould somewhere. If the mould is fully vacuum-tight the flow of resin into the catch pot will stop when you stop feeding the inlet with resin. Some flow may continue while the mould relaxes but it certainly shouldn't empty the cavity.