JHPK H30 - 5.5.2 Method II:

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Step 4: Shut down the machine as if in a routine shut-down operation.
Note: If performed once every 15 days, this procedure is effective in preventing black material (isocyanate)
crystallization in the hose.
5.5.2 Method II:
This method is for an excessive period of nonuse of the equipment; for example, shut-down for winter or
for an indefinite period of time. observe the following procedure: (mainly for isocyanate)
Step 1: Lift the feed pump from the feed bucket and clean the pump exterior surface of feed material using
solvent.
Step 2: Put the feed pump into a container filled with clean solvent. Switch on the regulating valve of the
feed pump to set the air source pressure to 0.1-0.2Mpa.
Step 3: Connect the main machine air source, adjust the main machine air source pressure to 0.1-0.2Mpa.
Step 4: Open the feed valve and spray the residual material remained in the equipment system into a
suitable container until clean solvent flows out. This step cleans off the feed material off the system using
solvent.
Step 5: Put the feed pump into a container filled with DOP (dioctyl o-phthalate) protection liquid.
Step 6: Start the equipment to let the system recycle for 2-5 minutes and then close the ball valve; make
sure the equipment material path is filled with DOP solvent and a 1-2MPa pressure is maintained.
Step 7: Shut down the equipment in a routinely manner, seal all material inlets and outlets.