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quinn
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Group: Forum Members
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Earlier I asked about double sided infused plate, which pretty much needs a core for flow, but since I'm building a prepreg oven, id like to know how it can be done this way. Let's say 2mm thick plate, and I want both surfaces looking nice. Can I simply lay the layers of prepreg on a sheet of glass, another sheet of glass on top, and bag the whole thing? If that won't work, what other methods are there? Sounds like commercially it's done by pressing 2 metal plates together. The parts I would be cutting out of this plate are a maximum of 8 inches wide, so longer skinnier layups are an option. Maybe I could use aluminum tooling plate with reinforcement ribs going across the width. The ribs could be machined with a very slight bow to give the layup plates a slight convex, when bolting together around the outside it should give good pressure in the middle. Would this be an option as well? Curious to hear different methods
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Matthieu Libeert
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+xEarlier I asked about double sided infused plate, which pretty much needs a core for flow, but since I'm building a prepreg oven, id like to know how it can be done this way. Let's say 2mm thick plate, and I want both surfaces looking nice. Can I simply lay the layers of prepreg on a sheet of glass, another sheet of glass on top, and bag the whole thing? If that won't work, what other methods are there? Sounds like commercially it's done by pressing 2 metal plates together. The parts I would be cutting out of this plate are a maximum of 8 inches wide, so longer skinnier layups are an option. Maybe I could use aluminum tooling plate with reinforcement ribs going across the width. The ribs could be machined with a very slight bow to give the layup plates a slight convex, when bolting together around the outside it should give good pressure in the middle. Would this be an option as well? Curious to hear different methods double sided finish carbon fiber plates are mostly made with heated hydrolic presses, you can always try with 2 plates, but wouldn't advice glass as it might break, better use aluminium then. you can get good results but keep in mind that all the "exces" resin will want to flow away in the brigde between the two plates
Founder MAT2 Composites X Sports
website: www.mat2composites.com  
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quinn
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Group: Forum Members
Posts: 155,
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+x+xEarlier I asked about double sided infused plate, which pretty much needs a core for flow, but since I'm building a prepreg oven, id like to know how it can be done this way. Let's say 2mm thick plate, and I want both surfaces looking nice. Can I simply lay the layers of prepreg on a sheet of glass, another sheet of glass on top, and bag the whole thing? If that won't work, what other methods are there? Sounds like commercially it's done by pressing 2 metal plates together. The parts I would be cutting out of this plate are a maximum of 8 inches wide, so longer skinnier layups are an option. Maybe I could use aluminum tooling plate with reinforcement ribs going across the width. The ribs could be machined with a very slight bow to give the layup plates a slight convex, when bolting together around the outside it should give good pressure in the middle. Would this be an option as well? Curious to hear different methods double sided finish carbon fiber plates are mostly made with heated hydrolic presses, you can always try with 2 plates, but wouldn't advice glass as it might break, better use aluminium then. you can get good results but keep in mind that all the "exces" resin will want to flow away in the brigde between the two plates So do i need to press the plates together in some way, like bolting them on outsides, or can I just put the sandwich together and vacuum bag it?
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Hanaldo
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People underestimate how strong glass is. Theres no problem using glass as long as it is tempered glass around 10mm thick. You can simply use two pieces together and vac bag them, I do it often. Just dont drop the glass on its edge, that is where it is weak.
As for the excess resin bleed, Mat is bang on there. You need to use flash breaker tape around the outside of your laminate to prevent that.
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quinn
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Group: Forum Members
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+xPeople underestimate how strong glass is. Theres no problem using glass as long as it is tempered glass around 10mm thick. You can simply use two pieces together and vac bag them, I do it often. Just dont drop the glass on its edge, that is where it is weak. As for the excess resin bleed, Mat is bang on there. You need to use flash breaker tape around the outside of your laminate to prevent that. Great, sounds like a quick process for making plate. So how do you use the flash breaker tape? Stick the prepreg down, then tape around the border of the layup with the tape laying flat on the glass and partly overlapping onto the layup, then lay other peice of glass on?
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quinn
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Also one more question on this. I'm not really clear on when to use single sided prepreg vs double sided. Do they both generally have the same resin ratio, just being biased to one surface with single sided? Should I be using single sided with resin towards outside for finished surfaces? If so, does this not make it more likely to have delamination issues with next layer? Just trying to figure out the differences. I wouldn't think it would make much difference if the resin starts flowing during the cure.
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f1rob
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Just put it down an cook
Either will work
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Hanaldo
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Single sided is just a technique to allow the material to breathe so air can get out without having to use the manual technique of having fibres of dry glass that act as a breather. Little bit old hat now, modern pre-pregs seem to be able to breathe well enough without either technique.
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