- Close all vent zones and remove all sieves if existing.
- Interrupt the material supply and run the barrel empty.
- Produce the purging mixture and fill it into the barrel
- Produce the purging mixture as follows.
- Mix 3 % of the purging concentrate to the cold raw material which is needed for the next production.
- Start the screw rotation till the purging mixture is coming out the nozzle. To be recognized on the foamy material structure.
- Stop the machine for 10 – 15 minutes. In this time the purging mixture will foam up and reach all dead zones.
- Start screw rotation and determine the extruded material.
- In case the result is not satisfied please repeat the process again.
- All hot runner systems (valve gate systems, open nozzles, etc.) can be purged by using the purging agents from ver~rus.
- After cleaning the plastification unit produce 3-5 times the quantity of the injection weight for purging the hot runner.
- Inject the purging mixture into the hot runner by opened mold till it comes out of the nozzle. To be recognized on the foamy material structure.
- Stop the machine for 10 – 15 minutes. In this time the purging mixture will foam up and reach all dead zones.
- Dose the purging mixture and inject into the hot runner. Determine the injected material.
- In case the result is not satisfied please repeat the process again.
- Interrupt the material supply.
- Empty the barrel.
- Produce the purging mixture and fill it into the barrel.
- Produce the purging mixture as follows:
- Mix the purging concentrate from 0,5% up to 3 % to the cold raw material which is needed for the next production. For difficult cases use 4% and for normal purging cases use 2% concentrate.
- The following quantity have to be produced depending on the screw diameter:
- Adjust the back pressure on maximum value so that the screw does not move. The screw has to stay near the nozzle.
- Let the screw rotate till the purging mixture is coming out of the nozzle. To be recognized by the foamy material structure.
- Stop the machine for 10 – 15 minutes. In this time the purging mixture will foam up reach and clean all dead zones.
- Start screw rotation and evaluate the extruded material.
- In case the result is not satisfied please repeat the process again.
- For purging the feed section of the barrel please produce the triple amount of the maximum metering volume of purging mixture.
- Dose up the maximum metering path and stop the machine for 10 – 15 minutes. In this time the purging mixture will foam up and reach all death zones.
- Inject the purging mixture and evaluate the material.
- In case the result is not satisfied please repeat the process again.
Reinigungsgranulat - Reinigungskonzentrat für die Kunststoffindustrie