Making a Vacuum Bag

[Tenson]

I don't think that is what I want it is super expensive and I'm not sure I can glue silicone together easily at the edges. I need vinyl sheet.

[mekanik]

That's why i went for the slip membrane(just because i had some) and it works fine with the gaffer tape to seal the edges, when you pull the vacuum the whole bag goes as tight as a drum. all i can say is it works for me. just cut the taped section off remove job and put in another one. If your doing regular production runs you might want to make a vacuum table but you will need the expensive silicone for that.

[Boyan Silyavski]

I will make my self very soon a vacuum table for sheet forming, vacuum infusion. May be you could get some idea from vacuum infusion.

So its basically a table with some vacuum seals and some switches. You could do similar and use the double seal idea to seal the bag/ there is no bag in fact/. Take a look at the video below, its for vacuum infusion, but the principle is what i like, That vacuum seals the vacuum and only a cheap sheet of plastic is needed, in your case instead of the methacrylate sheet in the video.

Its just an idea that might work better on the long run

[Tenson]

I'm going to get some of this to make a durable bag - http://www.attwoollsmanufacturing.co...ame-retardant/

This one is 0.5mm but they do a 0.7mm version too if more strength is needed.

I just need to find the best adhesive for it. I've done a bit of testing with some clear PVC strip I had and very few adhesives bond strongly. Super-blue seems to be the best. Joe Woodworker recommends something called HH66 but it is really expensive to import from the USA. I tried some PVC pipe cement but it didn't work well at all. You can get 'vinyl repair glue' for things like blow-up beds and pond liners but it comes in small tubes. Still I might give it a shot at £3 a tube. Then there is Scotch-Weld Vinyl Adhesive but I'm not sure it is suitable for this kind of sheet rather than solid PVC.

[Boyan Silyavski]

You need an adhesive that glues all to all, that looks like silicone. Or you could use strong 3m double sided tape. The good tape sticks so well to any material that no way you could un glue it

[Tenson]

The material is PVC. I've tried some general purpose solvent free glue and it is poor. Or do you mean I should try silicone adhesive?

[Boyan Silyavski]

The material is PVC. I've tried some general purpose solvent free glue and it is poor. Or do you mean I should try silicone adhesive?

Its not exactly silicone, just looks like silicone. Do you know the glue that glues all to all and is weather resistant and flexible. They sell it here in Spain in every big shop. In a plastic bottle like silicone. Its for automotive use. I am just now going to the shop where they sell glues, so will post a picture later. Its called Ceys Total tech I used the one on the left , i think that the only difference is that its transparent