General > General Technical Chat

Making a high pressure vacuum chamber

<< < (5/6) > >>

No_Shorty:
Thanks, I think it is making sense to me (more or less) now.

james_s:
For additional reading, this is more that you ever wanted to know about vacuums.

https://www.repairfaq.org/sam/lasercva.htm

No_Shorty:
Haha, that sure a lot  :-DD

wraper:

--- Quote from: No_Shorty on March 09, 2023, 06:27:47 pm ---
--- Quote from: wraper on March 08, 2023, 05:33:07 pm ---LOCA doesn't need vacuum chamber. The problem is how to avoid glue getting inside of LCD on the edges and screwing up light diffuser.

--- End quote ---

Technically, no - but it is a royal pain removing bubbles from a large LCD, I would hope a vacuum would do a better job.

--- End quote ---
You don't need to get rid of bubbles as long as glue was applied in proper pattern and touch is slowly placed under slight angle so no air is entrapped.  I personally glued touch to 11" LCD. Making a jig will make the job much easier.

jpanhalt:
Added confusion: getting rid of bubbles v. degassing

1) Vacuum is used for degassing usually. Sparging can also be used to reduce gas content or change it from say air to argon/helium.
2) One can easily use vacuum to remove bubbles.  Take a fiberglass layup.  You may get bubbles.  If you put it into a flexible bag and apply vacuum such that atmospheric pressure is on the wet layup, then one removes those bubbles.  That might be analogous to using vacuum to add transformer varnish without bubbles.
3) Of course since the resin (e.g., epoxy) is likely saturated with air at atmospheric pressure and tends to degass once mixed, if you add enough pressure to a wet layup one could reduce those bubbles to very small size or force them to redissolve in the matrix.  Once the epoxy sets, they will appear to be gone.  My concern is whether with time, they may reform.

The problem with vacuum is that one is limited to a pressure of about 12.7 psi depending where you are.  With pressure, you can exceed that pressure pretty much at will.  I only have experience with #'s 1 & 2.

Navigation

[0] Message Index

[#] Next page

[*] Previous page

There was an error while thanking
Thanking...
Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod