Darryl Keil Last Activity 2025-09-09 11:09 AM
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mike mcnerney

Posts: 87

Joined: 2003-07-17
Location: ottawa ontario

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Subject : leaks
Posted : 2010-03-06 2:51 PM
Post #35958

I would like to think after 25 years I could figure out where the leaks are, but I can't on this one. I just replaced the nipple on one of the original 4 x 6 bags where I thought the leak might of been coming from. so that's done & it all works real good for flat surfaces. the pump doesn't come on & off too much. But I am putting this question in the context of glue ups with big funny shaped forms inside the bag & everything gets really scrunched up when you hit 25HG. So is there some other thing I have to watch for in these situations. The mold is 7" wide, 12" tall, & 24" long. the curve is the classic 'S'type curve of 1/2 an accoustic guitar. Everything pulls in with my help nicely. When it's all drawn the seal of the bag is a long curve instead of the normal straight one you get with flat work. Maybe something there?
The one I got in there now is occilating every 8 mins or so, not so bad.
But the last one was like every 1 minute. & on flat work typically 10 to 15 mins. So what's my question?
What should I be looking out in order to have more consistency?
cheers
Mike McNerney


 
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Don Stephan

Posts: 825

Joined: 2003-07-18
Location: Cincinnati, Ohio

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Subject : RE: leaks
Posted : 2010-03-06 4:39 PM
Post #35959 - In reply to #35958

If one or more wrinkles reach all the way to the seamed edge, the stress may have pulled a hole at the heat seam. That's happened to me before I knew not to let wrinkles reach the heat seam. Do you have a vinyl or poly bag?
If you have some Evacunet, you could use that with the grooved platen to check for leaks in various parts of the bag. Wiping the surface over the Evacunet with water tinted with red food dye should flag the hole(s). Without the Evacunet, if the hole is in an area between grooves the bag can seal against the platen and not leak.



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