Perforated Core required?

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#1

Hi Guys,

I have seen several comments and postings regarding the use of a perforated core for infusing both sides at the same time.
But is that really required?

So for example, if I needed to make plain flat panel and used a Plain Foam Core arranged like this:

  • Vacuum Bag
  • Distribution media
  • Perforated Release
  • Peelply
  • FiberGlass layers
  • Foam Core
  • Fiberglass layers
  • Peelply
  • Perforated Release
  • Distribution Media
  • Waxed glass surface

Seems to me that would work just fine… but maybe it really doesn’t and the perforated core is to keep the resin fronts in sync?
If anyone knows, I’d really appreciate your insight.

Thanks in advance!
Dallas

#2

Can work, depends on your flow media on the mould side. But you won’t have a shiny side and your mould must have a offset.
It’s easier to use a prepared infusion core material.

#3

Cheaper too.

I would be concerned about the laminate on the mold side getting distorted and not properly being pressed against the core. The pressure would be localized against the flow media.

#4

It works ok I have done it that way in the past when using heavy laminate stacks. Pinhole opens up more options like multiple core sandwhiches.

#5

Indeed this setup is perfectly possible. You would like a minimal amount of holes to syncronise the fronts, or just live with it, and accept a minimal amount of resin in your vacuum line. (MTI hose, anyone? :))

On contact with the core: I would not worry too much, especially with thicker laminates.