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This is the transporter mechanism for the air you're trying to suck out of the laminate. As the vacuum builds, the air needs a way to get out.
The breather (sometimes called a bleeder) provides a passage for said air. Ok, technical term here. Ready? "GASES". |
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Breather material looks like white felt. It's used to help evacuate gases from a laminate as the pressur e generated by the vacuum starts to increase.
Somebody's gonna whine now. Pressure? Vacuum is expressed not in pounds of force, but in inches of mercury!! Yeah yeah yeah we know. BUT, at sea level, atmospheric pressure is 14.7 psi, right? Remove the atmosphere and what do you get? 14.7 psi of pressure from the atmosphere, unopposed as it squeezes the ever-lovin' devil out of that laminate.
Test question. What's the equivalent weight (in pounds) that would be applied to an area of one square foot if we were using a vacuum bag to evacuate the air over that area? |
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