DuCaPurge was created by Dugdale in response to customer desire for a universal purging compound. DuCaPurge is not only a purging material for injection moulding but a purging compound for extruders as well.
DuCaPurge is designed to be used without the need for soaking, therefore reducing down time for cleaning to an absolute minimum. This benefit has been successfully proven through testing conducted by moulding and extrusion processors throughout the UK and overseas. The results confirmed that DuCaPurge minimised scrap and significantly decreased cleaning or maintenance down time and stoppages.
Our team will be happy to assist with any questions you may have from a purging material injection moulding perspective or extruder cleaning compound stance.
DESCRIPTION: A thermoplastic purging compound for extruders and plastic injection moulding
PRODUCT FORM: Granules
PROCESS INFORMATION: Note: DuCaPurge does not work by chemical reaction. No soak time or hold-up time is required for an effective purge. DuCaPurge is designed as a "PURGING" compound for extruders and injection moulding and should not be used as a "FREEZING" compound. For maximum performance, DuCaPurge should not be diluted with other materials.
Purging for injection Moulders
- Following completion of the production run, check that all zones are in the correct temperature range for the grade of DuCaPurge used
- Retract the injection unit. Run the barrel empty using maximum backpressure. Wipe the hopper and feed throat
- Feed the required amount of DuCaPurge into the hopper. About one to two barrel capacities is required for purging a typical injection moulding machine. The actual amount required depends on the difficulty of the application and the condition of the equipment. Start with about one barrel capacity
- With the screw completely forward, increase the backpressure to the maximum level
- After DuCaPurge begins to exit the nozzle, increase the screw speed to the maximum safe level
- Decrease the backpressure once the DuCaPurge exiting the nozzle is almost clean
- Retract the screw and perform short, high-velocity injection shots
- Repeat the above if contaminants are still visible
- The machine is clean and purging is complete when DuCaPurge is visibly free of contamination
- Displace the DuCaPurge remaining in the machine with the next resin, again, at the maximum backpressure and maximum safe screw speed with the screw completely forward Note: DuCaPurge works best with maximum agitation. Use the maximum safe screw speed and maximum safe backpressure with the screw in the most forward position. Experience may allow this procedure to be varied slightly to suit the processing equipment concerned.
Note: DuCaPurge works best with maximum agitation. Use the maximum safe screw speed and maximum safe backpressure with the screw in the most forward position. Experience may allow this procedure to be varied slightly to suit the processing equipment concerned.
Purging instructions for extruders
- Following completion of the production run, check that all zones are in the correct temperature range for the grade of DuCaPurge used
- Ensure that the hopper and barrel are empty. Wipe the hopper and feed throat
- Whilst the screws are turning, slowly feed the required amount of DuCaPurge into the hopper. The actual amount depends on the difficulty of the application and the condition of the equipment. Start with the minimum amount
- Ensure that a safe extrusion torque and pressure are observed at all times during purging until DuCaPurge is visibly free of contamination. If contamination does not clear, repeat the process
- Displace the DuCaPurge remaining in the machine with the next material, again ensuring that a safe extrusion torque and pressure are maintained at all times
Note: Experience may allow this procedure to be varied slightly to suit the processing equipment concerned.
Information in this publication and otherwise supplied to users is based on our general experience and is given in good faith, however due to the many particular factors which are outside our knowledge and control and effect the use of products, no warranty is given, nor is to be implied with respect of such information. Users should make their own enquiries to determine the suitability of products for any particular application.
