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Fluid Agitator

08/13/2007 9:34 AM

Here is the idea. An ink well has a viscous fluid (in my case, silicone based) and a problem occurs when the heavier particles settle to the bottom of the ink well. The inkwell is made of two layers, the foremost is a thin stainless steel layer while the latter is a polypropylene based paper. I came up with an idea to use resistive coils to generate and transfer heat through the inkwell into the fluid, to cause the fluid at surface contact to become heated and thus expand. This would, in my mind, create a flow of fluid which would prevent the particles from settling to the bottom.

The problem is I dont know what the conductive heat transfer coefficient of the ink well and I dont know the specific heat of the silicone based fluid.

Other than that, is it conceivable that something like this would work? Or is silicone very difficult to excite?

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#1

Re: Fluid Agitator

08/13/2007 10:04 AM

Ultrasonic agitation or sonic agitation would probably do it?

Won't heat cause it to dry out or cure too quickly?

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#2

Re: Fluid Agitator

08/13/2007 10:44 AM

I was thinking of ultrasonic as well. I was looking into using ultrasonic linear actuators to vibrate the inkwell, but I was worried that my cause fractures in the frame of the inkwell. I dont have exact data on the composition of the inkwell, but I do believe actuators would fall under the natural frequency of the frame. The other thing that concerns me is maintenance. The place I work at has very little experience maintaining high precision equipment like an actuator, and since Im an intern, I probably wont be around to trouble-shoot anything.

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#3
In reply to #2

Re: Fluid Agitator

08/13/2007 11:08 AM

Play with some old speakers if you don't fancy ultrasomic!

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#4
In reply to #3

Re: Fluid Agitator

08/14/2007 12:54 AM

Good choice! And, you can listen to some good music. I like "multitasking".

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#5

Re: Fluid Agitator

08/14/2007 5:12 AM

We have a similar problem in dispensing abrasive materials suspended in oil, the machines either use a mechanical paddle continuously stirring the liquid or hold the container at an angle & continuously rotate it. Both dispense through a pick up pipe that pokes into the top of the container.

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#6
In reply to #5

Re: Fluid Agitator

08/14/2007 5:26 AM

Hey, I like the 'angle and rotation' thing, could add tiny little blades like a mini cement mixer....

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#8
In reply to #6

Re: Fluid Agitator

08/14/2007 8:44 AM

You could just buy one ready made.

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#7

Re: Fluid Agitator

08/14/2007 8:32 AM

Attach your receptacle to a slowly rotating (preferably reciprocating) shaft. There are ready-made similar devices made for charging automatic watches.

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#9

Re: Fluid Agitator

08/14/2007 10:59 AM

Ive decided to use a small electric motor with a shaft and a small propeller attached. The amount of agitation isnt that much considering the small size of the inkwell ( about 10"L X 8"H X10"W). Its basically a mixer.

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#10
In reply to #9

Re: Fluid Agitator

08/16/2007 5:06 AM

Here's another idea. Chemistry labs use a platform (looks like a small electronic scale) that contains a magnet, just beneath the surface, which is driven by a variable speed motor. You place a container of liquid you want to stir on it, and place a plastic capsule in the liquid. The capsule also contains a magnet, and it is rotated by the motorized magnet with no direct physical contact.

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#11

Re: Fluid Agitator

08/16/2007 9:28 AM

Yeah, those are linear stages. I was thinking of using one, but I dont think it would be effective as the ink well is firmly attached to the frame of the printing press.

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