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Coffee Puck sticking to shower screen


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Hi Guys,

Anybody else suffer from the puck sticking to the shower screen when you remove the portafilter?

I ususally get this 50% of the time and it drives me nuts.... I’m assuming it’s to do with the suction when the valve does the business?

 

I have tried everything to minimise the issue. Using a 18gram shot with the standard double basket with an IMS shower screen. Tried different force tamping, twisting, varied the shot weight. Doesn’t make any difference really.

 

Any thoughts?

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  • 7 months later...

This normally happens to me if I don't leave enough gap for expansion of the puck, so to resolve (assuming a consistent weight in) I loosen off the portafilter by ten/twenty degrees or so. Whether you can do that may depend on the seal/gasket on your particular machine.

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  • 9 months later...

I agree the size of the gap (and the grind) play a role. I like the puck to raise enough so I see a small imprint, nor pronounced.

But also a clean grid , the underside of the grid is covered with sticky oils before cleaning with some crystals or pullycaf

The initial pressure at the beginning of extraction push on the puck, send the fines at the bottom. may be a too slow pressure raise is wrong ?

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If it's a Sage DB it can happen where ever the top of the puck sits. It can be a bit mysterious. For instance I have run with the same bean, dose, shot time for a long time with no sticking. :) Tried a variation on prep and it's stuck twice on the trot. Difference a 3 wing levelling tool and levelling the grinds first with cocktail stick. Previously just a chisel type leveller before and nothing done to the grinds. Going on a few shots the main reason seems to be the use of the cocktail stick as the 3 wing on it's own didn't stick.

I use 13.5g. Get to 13.7 and it's likely to stick. 13.6 is ok. Drop it to 13 say 13.2 and it generally sticks.

The answer is a certain length of a press of the shot button. Say a couple of seconds.

If it is the  DB I am using an IMS screen as well. Not sure it helps with this problem and the thicker rim means some evidence of that can always be seen on the used puck.

This seems to be a problem with the model.

John

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People should really mention the machine when they ask questions like this. Another Sage. The BE, At some fill height they stick. Needs to be approached slowly. When that happens another 0.1g can stop it from happening.

Some one with an E61 machine. Sticks if the lever is moved too quickly to end the shot. ;) One report anyway.

John

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  • 3 months later...

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