We recommend “screw rotation purge” as basic purging method. This method can clean the both of screw and barrel by screw rotation.
■ Main points of cleaning procedures
|Back pressure||High (enough so that the screw does not move back)|
|Screw position||Furthest forward position|
|Screw rotation speed||Same rotation speed as molding operation|
|Temperature||Same operating temperature as previous resin.|
■ Purging procedures
|1. Discharge previous resin entirely.||
The purging effect will decrease if previous resin remains. Confirm that nothing is left in the hopper and feeding line.
|2. Clean the hopper before feeding ASACLEAN.||
Refer to the table below and estimate the quantity of ASACLEAN to use.
|3. Purge by screw rotation method.||
Back pressure : High
Screw position : Furthest forward position
Screw rotation speed : Same speed as molding operation
Temperature : Same temperature as previous resin
|4. Visually check the discharge of previous color.||
If you stop the machine, please apply sealing procedures.
|5. Set temperatures for next resin to be processed.||
Change the temperature here if necessary.
|6. Clean the hopper before feeding next resin.||
Confirm that nothing is left in the hopper and feeding line.
|7. Discharge ASACLEAN by screw rotation purge.||
Perform in the same way as the purging operation.
|8. Visually check the displacement of ASACLEAN.||
Confirm that ASACLEAN has been displaced entirely.
|9. Check the molded products.||
Check the quality of molded products.
■ Normal quantity of use
|By machine capacity
[ Test condition ]
Purging temperature : 240°C / Resin purged : ABS
|Clamping force (tons)||Quantity of
ASACLEAN U (kg)
|By operating temperatures
[ Test condition ] Clamping force : 125 tons
|Molding temperature (℃)||Quantity of
ASACLEAN U (kg)
PMMA, POM etc.
|230-250||0.6||ABS, SAN(AS) etc.|
PC, PBT etc.
* If this cleaning method is not effective for your machines, please contact us or our distributors for technical assistance.