tatest wrote:
WoodGlue wrote:
gmw photos wrote:
Woodglue,
Can you tell me how much clamping pressure is applied when utilizing a vacuum bonding procedure ?
Also, can you tell me what the correct clamping pressure and time is for the adhesive that might be in use for these different constructions ?
thanks.
Hi there,
I have those numbers somewhere around here. If I don't post them today, please remind me! I do know that it's oftentimes measured in percentages (%) It also has to do with the type of adhesive being utilized. For instance, Lamilux has their own set numbers.
120 - 130 pounds per square inch is one number I just found. And that's vacuum pressure, not clamping.
WoodGlue
How do you get 8X atmospheric pressure by pulling a vacuum?
Exactly, that maybe pinch rolled but not vacuum. Hek when I calibrate vacuum instruments, I can't even even get to absolute zero. You can get near but it's impossible to get to 0. For those that don't know, absolute zero is the negative barometer reading of the day. Barometer is referenced off of absolute zero where guage pressure/vacuum is referenced off of the atmosphere.
If the barometer of the day is 31 inches of mercury that means that absolute zero is at a vacuum of 31 inches of mercury or at a pressure of -31 inches of mercury. Thus barometer is at a pressure of 31 inches of mercury absolute. 31" of mercury = 15.23 psi . So a vacuum of 15.23 psi is a perfect vacuum. No vacuum greater than this can be achieved. 120 psi is 7.88 times greater than 15.23 psi. ;)
