MTI hose

Post some pictures!

Pictures in the showcase! :slight_smile:

Dominik, I found a similar minded guy in the UK. Do you see anything strange in the video, besides not using MTI hose or spiral at all, and besides the vacuum pump noise spoiling the sound at the end?

[ame=“http://www.youtube.com/watch?v=n_3kOTFri44”]How to produce a carbon composite part using vacuum infusion - YouTube[/ame]

There are a few things I found.
He takes tape instead of spray adhesive, thats better because there is no other material in the part, BUT: you can not lay down several layers, may be at this easy part, but he already had problems with placing the peel ply correct.
First I thougt he uses a coated peel ply because he is not using perforated film, but it peels off quit heavy.
He clamps the resin inlet near to the mould, I would not do that because there is air in the first part of the inlet hose. Also he did not degas his resin.
The release tool he is using ist much better than a srew driver :rolleyes: I would never ever do that :smiley:
After release of the peel ply the peel ply surface is not over the complete part, that means the peel ply was not layed down correct and air was in the mould.
So the part could not be perfect and the part is not shown direct after demolding!

I am glad you notices the 2 tools he used for releasing. First he poked the tool with a putty knife, but as that attempt failed, he used a HUGE chisel to pry the part loose.

And indeed he had a lot of fun removing the peelply.

I will make a new video if there is time without using a screw driver, than I will use a plastik putty knife and plastic wedges as usual.
But if you have a flat mould there is no problem using a metal putty knife, its not optimal but it works well if you are carefull.
Is there any other video than our one in the internet where they show the part direct after demoulding? :wink:

Yes, there is the one from an English company. I will look it up. But indeed, many do not.

I remember where Remi de Moor did demos (simultaneously in 6 languages, “look, sehe, kijk, voir, attencion, guarde!” and where he used PVA film to make all kind of products, with a “pour and hope” system, UV curing. Of course the polyester never cured properly, and the part after demolding (within 5 minutes after production) was immediately swapped for a premade one. He looked like Hans Klok / Sigfried & Roy / any other magician.

Here they are no magicians either:
[ame=“http://www.youtube.com/watch?v=VodfQcrXpxc”]How To Do Perfect Vacuum Resin Infusion of a Carbon Fibre (Fiber) Part - Basic Tutorial - YouTube[/ame]

The part is not shown direct after demolding, just short and no zoom. There is also a lot of air in the flow media and I would never make an infusion like he did. That will work but is far away from an perfect infusion and every second part (if it works well) needs cosmetik work.
Lot of people I know showed me the video and told me that it does not work if they do it like the video.
It could not work if you see all the air trveling through the resin during infusion.

What is the suggested way of connecting mti hose to the vacuum line?
I ordered some last week and so made do with what connectors i already have.
I ended up cutting the mti hose half way along It’s length, pushing 7mm spiral wrap inside it and placing a silicone connector over the exposed spiral wrap. It worked ok but I’m not sure I should be doing something like that considering the resin trapping purpose of mti.

Sure that you have the MTI hose? Where have you bought it? There is already a spiral tube inside, you can put you vacuum hose in the spiral tube inside and seal it with tacky tape.
The MTI hose is patented and MTI is a registered trade mark.

Yes definately MTI hose, from HP-Textiles.

You answered my question anyway thanks :slight_smile:

Ok, thats fine that the information helped you. Be sure that the MTI hose is connected correct.

I have just bought the MTI hose from HP.
I have two questions: what’s the best method to join the vacuum hose to it securely?
What kind of spray adhesive has been used on the MTI video? Where is it available?
Thanks

Roberto

DDCompound can answer officially, but when I received my sample MTI hose it came with an example piece which shows how to connect the hose and seal the end. On the end you want to seal, just use bagging tape. On the end you want to connect to the hose, wrap part of the spiral (inside the MTI hose) around your vacuum tube and seal with bagging tape. Hope this helps :slight_smile:

Here some pictures how we connect the MTI hose and never had problems. The first two picture show how we close the end.

Close the end


connect to vacuum hose

Hope that helps.

Helps a lot. What about the spray adhesive?

I used this spray adhesive:

http://www.werkstatt-produkte.de/product_info.php?pName=spr�hkleber-400ml&cName=aerosole-spraydosen

It is cheap and works. But you can also use spray adhesives for vac infusion like Airtak, Aerofix2, Infutac…

I have an order of MTI hose on the way and I can’t wait for it to arrive! Hopefully soon…

Sorry, that I am asking here about spray adhesive.
I am using aerofix 2 and tacky is excellent, but after demoulding on my final product I can see a lot of glue spots.
The resin (epoxy) don’t dissolved glue during the infusion.
Anyone know on which glue this problem doesn’t occur.

Do you use a in mould coating? Try the system from HP Textiles and use only a light ammount of spray adhesive.
I use the spray adhesive from http://www.werkstatt-produkte.de and do not have any problems.