Examples of plastics field
Kleentek's proposal to those involved in plastics
What problems are you having?
Injection molding
・Injection molding unit comprises mechanical parts and a control part (including computers) Since the control part is recently improved in accuracy, the main problem is the trouble in the mechanical part.
・Contaminants (oil oxidation products) of oil cause problem.
Major problems
[1] Malfunction of servo valves (intermittent interruption)
Oil oxidation products adhere firmly inside a groove of the valve spool causing valve to lock, resulting in operational malfunction
[2] Pump problem
Oil oxidation products clog suction strainers and line filters, causing cavitations which in turn induces changes in flow rate and pressure.
Quality failure, Lower operation rate
EOC can eliminate oil oxidation products, which is impossible to do with filters, and maintain
the oil as clean as fresh oil. Thus, problem such as mentioned above are prevented.
Examples of EDC leading to quality improvement
Source: INJECTION MOLDING MAGAZINE (USA), February 1997
Fluctuation ranges of injection molding conditions before and after oil cleaning with EOC.
| Item | Before oil cleaning | 800 hours after oil cleaning |
| Cycle time fluctuation range | 2seconds | 0.7seconds |
| Injection time fluctuation range | 1.73seconds | 0.62seconds |
| Recovery time fluctuation range | 1.63seconds | 0.78seconds |
| Pressure fluctuation range | 690PSI | 94PSI |
As a result, incidence of defective products was reduced to 1/6 compare to before introduction of EOC