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TOPIC: Screw and barrels cleaning

Screw and barrels cleaning 1 year 7 months ago #1893

Good morning

Can you please tell me if you have information about the 1", 2", 2 1/2" and 4" screw and barrels cleaning, Bronze Brushes size, materials, frequency to clean them, copper net, fabric, chemists and so on.

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Re: Screw and barrels cleaning 1 year 7 months ago #1894

Hello Ayala,

I am very confident that your country has many, many industrial distributors of copper wool and bronze brushes of all sizes and shapes.

It is also pretty difficult to tell you the frequency rate re the cleaning of your screws and barrels when we have no idea of the plastics or rubbers you are continuously extruding for say a week or more. We therefore recommend you contact your polymer suppliers in this regard but remember it also depends on your experience. They can also recommend the appropriate clean out compound for their polymer if you really need that information.

One old method:

(1) Remove the crosshead and lower the extruder temperatures.
(2) Use PVC to scrub the screw and barrel until pellets start coming out of the extruder.
(3) Empty the PVC from the extruder.
(4) Hydraulically pull the screw.
(5) Properly clean the screw and barrel with copper wool and bronze brushes. (The barrel is cleaned with copper wool wrapped around a cloth which is in turn wound on a steel pipe longer than the length of the barrel. This looks like the tamping/ priming pole used with old cannons. The cleaning head is say 8 to 12 inches long {20 to 30 cm} and very close to the diameter of the barrel.)
(6) Blow out the barrel with filtered, dry compressed shop air and check that it is completely clean. If not, clean again. Always wear safety glasses when using compressed air.
(7) Blow off the screw with the same compressed air supply. Make sure that it is completely clean.
(8) Reinstall the screw.

As far as small components (breaker plates, etc.) are concerned, you may wish to consider a small fluidized bed furnace. A bit of care must be taken when using these devices however to ensure that all residual chemicals are completely destroyed in the furnace or completely removed so that later on, no tooling corrosion occurs.

You can do your own research re furnace suppliers by going to the "Virtual Trade Show", logo above and under "Products", select "furnaces-fluidized bed".

Kindest regards,

Peter Stewart-Hay
Stewart-Hay Associates
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Re: Screw and barrels cleaning 1 year 7 months ago #1895

Thanks you very much my friend
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