Overhauling of Injection Molding Machines
Cleaning prior to a maintenance shutdown can require significant time and effort. Using ASACLEAN prior to a maintenance shutdown will greatly reduce the resources required to perform this task.
- Extrude the remaining resin from the system with the screw completely forward and back pressure at the maximum safe level.
- Purge following the standard ASACLEAN PURGING INSTRUCTIONS. For pre-maintenance cleaning of injection molding machines, ASACLEAN EX is the most effective grade due to its high scrubbing power. Other grades may be used, but might not be as effective at removing stubborn deposits.
- For easiest screw removal and maximum cleaning, the screw and barrel should be purged with a melt temperature between 43O°F (220°C) and 570°F (300°C). For resins processed below 390°F (200°C) use ASACLEAN U, E or UP to remove the low temperature resin, then increase the temperature to 430°F (220°C) for further cleaning with the ASACLEAN EX.
- After the ASACLEAN purging’s appear clean, continue extruding the remaining ASACLEAN until no material is coming from the machine. Do not introduce any new material into the machine prior to manual breakdown.
- Turn off the heaters. If purging with ASACLEAN EX wait until the temperatures in the barrel drop to between 430°F (220°C) and 460°F (240°C) then pull the screw. Melt temperatures outside this range will result in more effort being required to pull the screw. For unfilled grades of ASACLEAN the optimum temperature to pull the screw is between 380°F (195°C) and 400°F (205°C).
- Continue following approved breakdown procedure. Exercise proper safety precautions such as the use of safety glasses and protective gloves to prevent thermal burns and other injuries.
BENEFITS from using ASACLEAN for pre-maintenance cleaning:
- The force required to pull the screw from the cylinder will be significantly reduced.
- ASACLEAN can remove almost all deposits from the screw and inner wall of the barrel, so only a minimum of effort will be required to complete the cleaning. Any remaining deposits or ASACLEAN residue can be easily removed by a wire brush or other standard cleaning tools.