- 1Preparation
At this stage, the granule loader and the dryer are separated from the feeding unit so that the purging mixture can be fed directly to the screw.
- 2Preparing the Machine
Remove the filters from the machine.
Reduce the machine barrel temperatures and filter area temperatures below the current temperatures by 20-30°C. For purging temperatures, see the TEMPERATURE/RATIO table.
Keep temperatures in the mold constant.
If the filters are inside the machine, do not lower the temperatures in the filter area.
- 3Preparation of the Purging Mixture
Shake the CLEANAAX® or CLEANAAX®GF bottle well before use.
Thoroughly mix 3%-4% CLEANAAX® or CLEANAAX®GF into the new granules that you will feed into the machine. For the mixing amount, see the SCREW DIAMETER/MIXING AMOUNT table.
- 4Purging
It is checked that the temperatures of the barrel and filter area drop by 20-30°C.
The prepared mixture is fed into the machine from the feeding unit.
The screw material intake speed is reduced by 50% or slightly less, and the mixture is flowed through the head.
During the purging process, if necessary, the reduced screw temperatures can be brought back to normal values so that the purging mixture can exit from the nozzle more smoothly.
- 5Rinse and Check
The granules that you will feed into the machine are passed through the machine in a pure form in an amount of at least 30% of the purging mixture.
If the raw material that comes out is clean, the operation is finished and new production is started. If there is still any residue, steps 2-5 are repeated.
- 6Finish
Check whether there is any purging mixture left in the feeding unit.
The filters are placed back into the machine.
The machine barrel and filter zone temperatures and the screw speed are adjusted according to the new material.
The machine is ready for new production.
