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Slot Die Coating with Mike Rothaupt

Posted by: Mike Rothaupt on Aug 7, 2019 3:31:12 PM



[Transcript] "Hi, my name is Mike. I'm a senior process engineer here at Tapemark, and today I'm going to discuss the advantages and disadvantages of slot die coating. So this is the slot die coating stand that we have here at Tapemark. Right now we just have the bottom of the slot die mounted to it so that we can discuss the geometry and how everything works. So while this is in operation, you'd have your coating substrate going around the casting roll, and this would be in close proximity to that, and when you're off coat it retracts. So while it's in operation, you can be having your blend fed through the back of the slot die through a pump with very little pulsation, typically gear pumps are used, some diaphragm pumps are also possibilities. So that would be forcing it through the back of the die spreading it through the internal manifold, and then casting it directly onto your substrate. So the big advantage of this type of system is that it's completely closed. You don't have to worry about any solvent loss or contamination while it's open to the environment, and also because it's directly metered right onto it. It's relatively independent of any variation in your substrate. So because of those two things you are able to achieve very high precision for your coat weights using this method. The disadvantage of this, is that the set up for it can be quite cumbersome. It can take a lot longer to dial in your process, so on some of the R&D type jobs where you're really trying to utilize the amount of money available, it might not be as ideal. But on large scale applications, this type is really starts to show its advantages."

Topics: Coating