how to fill high viscoity liquid in small gap

[Spoonful]

Hi all,

i got another problom here,

how can you fill a liquid( viscotiy is about 7000 cps) into a 0.2mm gap?

Thanks in advance.

 

[TheTick]

Can you heat it and achieve lower viscosity?

Perhaps vacuum to draw the liquid in?

 

[Spoonful]

Thanks to the reply TheTick,
the liquid will gets more viscosious when heated, it some kind of retainer compound. and vacuum is not feasibale.

for that viscocity 7000cps, will it flow though a needle?

 

[Ron]

Put a flat plate across the gap. Add dead weight to the plate. Inject the liquid into the gap under pressure below the plate. Remove the plate. Clean up.

Injection pressure should be no more than 1/2 the contact pressure of the dead weight. Might require a little trial and error.

 

[Ron]

ps...you'll need a gasket between the plate and whatever it is sitting on, and on both sides of gap

 

[Pud]

I would ask the fool who designed it..

H

http://www.tynevalleyplastics.co.uk

 

[ash9144]

Put a thread or thin wire into the gap and let the liquid wick into the gap.

 

[Latexman]

What's it's rheology like? Newtonian? Non-Newtonian? Shear thinning? Shear thickening?

Good luck,
Latexman

 

[GregLocock]

Just for those like me, 7000 cps is about as viscous as molasses. Maybe you could smooth it into the gap with a teaspoon!



Cheers

Greg Locock

SIGlease see FAQ731-376 for tips on how to make the best use of Eng-Tips.

 

[berkshire]

Put a zerk fitting on it and shoot it in with a grease gun
B.E.

 

[MotorVib]

in motors we used vacuum and preassuer cycles to fill gaps

"In this house, we obey the laws of thermodynamics." Homer Simpson

 

[griffengm]

Spoon,
Depending how big this assembly is and how many you need to treat you might combine Ron's idea of sandwiching the parts with Berkshire's by adding the zerk to one of the plates. There is a bearing packer that uses this method to squeeze grease into bearings.

Griffy

 

[hydtools]

Is the gap between flat surfaces? Put a measured quantity of liquid on one surface, then assemble the parts. The liquid will spread throughout the assembled clearance. Calculate the volume of the clearance to determine the quantity of liquid to apply.
Is the gap between two cylinders? Cap both cylinders. Put a measured quantity of liquid in the bottom of the outer cylinder and push the inner cylinder into place. Force the liquid into the gap between them.

Ted

 

[GregLocock]

Or is the situation more akin to grouting a bathroom tile, in which an aesthetically smooth surface may hide a void?

Cheers

Greg Locock

SIGlease see FAQ731-376 for tips on how to make the best use of Eng-Tips.