I just clamped the vacuum hose, and shut down the pump.
If your bag is tight, what it has to be, you can clamp the vac line and shut the pump off. I always leave the pump running until the resin is cured, but that is just a personal preference, there is no needs, theoretical.
Thanks for all your hel
Thanks for all your help and knowledge
I recall reading from DD that we don’t need a catch pot using the MTI hoses
Can you please explain ?
The MTI hose does not let resin through. So your vacuum line keeps dry. Hence no real need for a catch pot, or if you use it anyhow, it will remain dry.
Hi Herman I know that you did your MTI test with catch pot and running the vacuum all time until complet cure. I read it earlier. And it was very helpful as always are your comments and explanation
My thinking is if you want to make few parts in the same time (6 to 12) if we can not use Catch pots to make it easier in the setup cost
Or will need a big catch pot to be able to plug up to 12 connections
Like you always say and you are right. Try try try
Hi Herman I know that you did your MTI test with catch pot and running the vacuum all time until complet cure. I read it earlier. And it was very helpful as always are your comments and explanation
My thinking is if you want to make few parts in the same time (6 to 12) if we can not use Catch pots to make it easier in the setup cost
Or will need a big catch pot to be able to plug up to 12 connections
Like you always say and you are right. Try try try
Just use a couple of T-connectors to connect multiple parts to 1 catchpot.
Most catchpots I sell have 4 connections anyhow.
Hi,
the MTI hose is available in the USA and Kanada. Take a glance at the official US website and watch an animation film about “How it works”.
Nice! I’ll be ordering some after the holidays.
For all those who are interested to see the MTI performance. It will be exhibited at Composites 2013 in Orlando, booth 655e. If you`d like to get an Exhibit Hall Pass for free send me a message at info@german-advanced-composites.com
I have not tried the product because I was late to the conversation. From what I have gathered from those who recieved samples the product works and is well liked. The cost is high it seems to me unless I was doing a one time flangless project. At least with boats a keel line infusion with a perimeter vacuum and a proper flange to brake the resin seems the most cost effective to me. I can understand its use for compicated/small parts, but can anyone give me an arguement for using this for a large porperly flanged mold. I suspect the best use for this product is in the tough to infuse spots in some molds where its value is priceless, but certainly not required for the total perimeter. I would welcome response from those who have recieved samples.
Jim
I do have some old molds which I carefully split in two off the plugs which may benefit from this product if I decide to infuse instead of of hand lay up; so no flange/difficult infusion with spiral wrap.
Jim
A Youtube video which shows the surface and structural component quality of a carbon fiber part produced by MTI
For some reason the video stalls at 3.31 on my computer, after which it shows other videos to see. Anyone having the same problem?
Video looks good so far. Do ask a sample of Fibertex Compoflex material. Saves us a lot of time watching you remove the peelply… 
(same for semi-perm releases)
But of course you know that already…
My video made it through.
Part looks great. Am I correct in assuming it is an appearance part with relatively high resin/carbon ratio? Am I correct also correct that the procedure for infusing such a part is to shut down and/or clamp off the perimeter return line once infusion is complete, then lower the resin source perhaps 1 meter to the floor until resin sets?
This is the kind of small complicated project your product seems to me to be ideal for.
Herman,
the video should be 2.29 min. And you are right with that peelply issue.
I have already made excellence experiences with compoflex but just with flat moulds. I do not have the faintest idea how to fix compoflex into such a complicated mould with that kind of sharp edges.
Magnus,
MTI is completely different from the standard Vacuum Infusion Process as you can see in the animation video “MTI® How it Works”.
Also, the most successful German windpower rotorblade manufacturers have been using MTI not only because it enables them to achieve a much more consistent and homogenous component structure which results in higher resistance to dynamic loading. It also prevents loss by wasting resin into a resin trap (up to 200kg in one shot with moulds of 120 meters square). Not to mention the difficult handling of exothermic reacting resin. Also, the process is much more reliable than with traditional VIP since the self-regulating and low-pressure process minimizes the risk of getting dry spots, avoids pinholes and and and…
To cut a long story short. MTI is far away from meeting all demands and it is not profitable with all applications. It was developed to support a competitive advantage since it enables manufacturers to produce high performance structural components or cosmetic parts with less effort.
To answer your question concerning clamping off the perimeter return line: You can adjust the fiber volume content by clamping the feed-line when the infusion process comes to its end or you can place the resin source below the mould cavity. One yard results in app. 150 mbar (4,4295 inHg) absolute pressure which corresponds to the fiber opening forces. There is no reason to clamp the vacuum line. The MTI hose is self-regulating and manage the vacuum reduction by itself. See the infusion process with two moulds in the YouTube video MTI® - Episode 7.
There are a few rules which are crucial to get the best possible results. Take a look at the MTI® Instruction Manual YouTube series.
You are right. Compoflex is a great material, but for relatively flat surfaces. (boats are OK, as are rotor blades). They are working on more drapable versions.