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Leda plastic recycling  Plastic recycling washing line 
 
To make all system to perform at the maximum possible level, material should be dosed at the right quantity at the beginning of the system.
 
The most common way to do it is to use a screw conveyor connected to a variable speed motor to control the speed and therefore the quantity of material conveyed.
 
This is also kind of compulsory between the first part of the system (sorting and granulation) and the washing line itself that, once again, should run with a steady, pre-set quantity of material.

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 Dosing by screw conveyors

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After preparation, meaning after sorting, shredding, grinding etc, so when material is in flakes form, the very best results are achieved when a constant flow is provided to the washing line.
So, between preparation machinery and washing line it should be a "buffer" something.
It can be a silo, in most cases, or any kind of container where flakes can be stored for a while, provided with an extraction screw conveyor to transfer flakes to the washing line.
The motor of this screw conveyor should be driven by an inverter or DC motor in order to vary the speed according to needing.
As far as dimension (diameter) of this screw conveyor the parameters to take in consideration are the following:
- Kg/hour to be fed
- Minimum and maximum RPM of screw conveyor (the gear box reduction ratio)
- The density of flakes (the specific volume)
 
More or less (according to density) flakes will take about 1/3 of the volume in each volute so divide whatever result you got by three.
And you're done.