Measuring Sealing - Ovens
Measuring Sealing - Ovens
(OP)
Hello,
I am wondering if anyone of you have any tip (or could direct me to appropriate person/institution/website) for as accurate, as fast and as quality as possible method for measuring sealing in VAPOUR ovens? Most important factor is time because the control is 100% in production procedure. But all factors (main is obviously flux) such as heating, condensation, etc must be considered and all elements of ovens.
Any tip on how to measure sealing in said case would be appreciated.
I am wondering if anyone of you have any tip (or could direct me to appropriate person/institution/website) for as accurate, as fast and as quality as possible method for measuring sealing in VAPOUR ovens? Most important factor is time because the control is 100% in production procedure. But all factors (main is obviously flux) such as heating, condensation, etc must be considered and all elements of ovens.
Any tip on how to measure sealing in said case would be appreciated.





RE: Measuring Sealing - Ovens
RE: Measuring Sealing - Ovens
Mike Halloran
Pembroke Pines, FL, USA
RE: Measuring Sealing - Ovens
http://media.bosch-home.com/Files/Bosch/Si/sl/Prod...
Need some good method, very accurate that includes all components (flow - air / sealing) inside the ovens. The method for measuring/analysing/testing sealing must be as fast as possible. A lot of ovens are made hourly and control is 100%.
RE: Measuring Sealing - Ovens
Mike Halloran
Pembroke Pines, FL, USA
RE: Measuring Sealing - Ovens
RE: Measuring Sealing - Ovens
RE: Measuring Sealing - Ovens
I have no idea what you're trying to say here.
It appears that you are presently controlling nothing.
Since you've provided essentially zero useful information, I'll speculate:
Since it's a steam oven, I'll guess that your 'final test' involves starting a cycle, and looking for steam leaks.
... and that ALL of the units are visibly leaking,
so you're trying to quantify the leak rate to allow you to say that you're inspecting per some procedure that you don't have yet,
with equipment that you don't have yet,
to some acceptance criterion that you don't know yet,
so that you can say you are measuring your quality
by inspecting all units and accepting most of them,
instead of what you are currently doing,
i.e., going through the motions of inspection,
and shipping everything you make.
... in which case you really don't need a QC operation, do you?
Mike Halloran
Pembroke Pines, FL, USA
RE: Measuring Sealing - Ovens
RE: Measuring Sealing - Ovens
RE: Measuring Sealing - Ovens
So, cook0, is there a way to pressurize the oven for testing?
Can the oven itself measure its internal pressure, or otherwise participate in the test?
Mike Halloran
Pembroke Pines, FL, USA
RE: Measuring Sealing - Ovens
1200 per day, or a lot more. How long is a day for you? One eight-hour shift? Two shifts? Three?
How many lines are making these things?
How much pressure are the ovens designed to contain? How much leakage is allowed?
Since you are forcing us to guess, I will guess that the flow rate of the allowed leakage will be difficult to measure accurately.
I would suggest pressurizing, then measuring the time of leak-down.
RE: Measuring Sealing - Ovens
Compositepro are you referring with your term "flow rate of air" to the sealing? Flow and sealing isn't the same but yes leakage can be defined as reverse sealing.
RE: Measuring Sealing - Ovens
As Compositepro suggested, that involves making some kind of test connection to the oven cavity, pressurizing to some reasonable pressure with clean air, shutting off the air supply, recording the pressure decay over time T, then venting any remaining pressure, disconnecting the test connection and sealing it.
Mike Halloran
Pembroke Pines, FL, USA
RE: Measuring Sealing - Ovens
- not sure how to evaluate the bag's forward bending and how to measure it. Bending is different in the center of bag than on different locations.
- don't know about fixed pressure - what to use, thats why I didn't answer you about max allowed limits - still researching. I only know working pressure meanwhile vapour oven will be in operating mode (client side) or testing method (my side) or production/measuring method (workers near production line side).
- i think the method i described for the START (just to do some progress) of project isn't even accurate at all
- not only described location (doors/bag) but different oven's elements also have air flow/leakage - sealing!
- too much pressure could cause door to open by itself at the top side of door (fastened are at the down side - leakage too). Equivalent is said polyvinyl bag.
- etc, probably many more reasons. Gotta dig further to research.
Is this what you were referring to? Venting of remaining pressure can be sucked from oven, thats ok but you probably meant recording sealing (how? via what? which locations? a lot to be said here) and not pressure. Pressure is shown on machine screen. Noting it down, thats it, no problem about the actual pressure. Could you clarify in more detail?
RE: Measuring Sealing - Ovens
Pressurizing the oven by means of a bag is a clever and perfectly acceptable way to do a leak test, provided you can make and demake a leaktight connection quickly enough.
The protocol could be as simple as:
- attach the bag, say to the top of the oven.
- inflate the bag.
- rest a book on the bag (to apply a controlled pressure).
- wait for X seconds.
- the oven fails the test if the book collapses the bag in X seconds.
- detach the bag.
Mike Halloran
Pembroke Pines, FL, USA
RE: Measuring Sealing - Ovens
RE: Measuring Sealing - Ovens
http://www.appliedmeasurement.com.au/product/Ateq/...
Bag might be, at least for start, appropriate way but its too time consuming. The workers won't be attaching bags on every single ovens. It would take too long. Also hard to measure how much (how far) does it react (bends).
Compositepro are you saying linkage between ovens and manometer should be tube in plastic material?
Seems like it will take a while to even recognize what are you suggesting....