Vacuum injection | How do you laminate a plate by vacuum injection?

Polyestershoppen.com is the number one specialist in composite materials and a  wholesale business in epoxy. One of our specialties is vacuum and vacuum injection (vacuum infusion). We offer a wide range of vacuum materials and necessary accessories. For example, in the vacuum materials category you will find everything you need to apply vacuum injection professionally.

In this article, we explain how to laminate a sheet using vacuum injection. This is a clean production method that produces a high-quality product. Led by our vacuum specialist Herman, we will take you step by step. Do you have questions about the vacuum injection technique or about the materials used? Feel free to contact us, our specialists will be happy to advise you!

What is vacuum injection?

Vacuum injection is a laminating technique in which the fibres are placed dry in the mould. These fibres are covered by a vacuum film (vacuum bag). Pumping air out from under the vacuum bag creates a vacuum that sucks resins, such as epoxy resin or polyester resin, into the fibre.

What are the advantages of vacuum injection?

Using the vacuum injection technique has the following advantages:

  • Clean process. After all, a quantity of resin is created only at the last moment, which then does not have to be processed manually.
  • High quality laminate.
  • No pinholes.
  • No air bubbles.
  • Low resin consumption.
  • High fibre to volume ratio.
  • No laminating experience required.
  • Work can be checked step by step in advance.

What do you need for vacuum injection?

All necessary materials for vacuum injection can be ordered very easily at Polyestershoppen.com. You need the following products to apply the vacuum injection technique: 

Tip: want to try vacuum injection on a small scale? With the resin infusion starter kit, you have everything you need to get started right away!

Vacuum injection manual

In the video below, specialist Herman explains how to laminate a sheet using vacuum injection. Below the video we have written out all the steps again for you. So you can read it back at your leisure.

Step 1.

You start by laying out the desired fibre package (in the video, glass fabric is used for this). Lay the glass fabric over the mould with the core material (3D Core) you want to use on it. The fibres and core material can be fixed with spray adhesive. Use only a minimal amount of spray adhesive.

After laying the desired fibres and core materials, lay the tear away fabric, perforated film and flow-through mesh on top of each other.

Step 2.

Connect the MTI hose airtight to the vacuum hose. To do this, push the vacuum hose into the MTI hose until it lights up neatly against the hose. Then wrap a piece of sealant tape around this.

To feed the hose through the vacuum bag leak-free, apply an additional piece of sealant tape.

Step 3

Press the resin supply line into the spiral hose and again apply a piece of sealant tape where it goes out through the bag. Tape the spiral hose to the other side so it won't move when vacuum is applied to the bag.

Step 4.

You are now going to apply the vacuum bag to the mould. In the video, we pre-treated the bag by already putting the sealant tape onto the edges. This makes it a lot easier to put the vacuum bag down. At the location of the piping, make a fold in the vacuum bag. This way you can be sure that you will have enough film for them later on.

After the vacuum bag is taped, check that it is properly and airtightly connected to the mould everywhere. Especially the folds and corners where sealant tape overlaps are important points of attention.

Step 5.

You have now made all the preparations and you can now turn on the vacuum pump to check the leak tightness. When you turn on the pump, you will see that it slowly draws vacuum. Make sure the pipes are neatly surrounded by vacuum film and that the product remains as flat as possible.

Step 6.

Now run the mixed resin through the pipes. The resin will slowly spread over the surface. After completion, turn off the resin tap and then let the epoxy cure for about 72 hours. After this, you can remove all the auxiliary materials. The result is a stiff and lightweight panel with no air bubbles.

More information about vacuum injection?

Would you like more information or tips on vacuum techniques? Our subject specialists will be happy to advise you. You can reach us on weekdays by phoneemailWhatsApp or via the live chat on our website.

All vacuum products can easily be ordered at Polyestershoppen.nl. If all products are in stock and ordered before 5 p.m. Dutch time, then your order will be shipped the same day. 

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Products used in this article

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Do you have a question?

Do you have a specific question? Call one of our specialists for free advice +3185 0220090