Premises

Cause of the stops	Build-up and wear, not press settings, cause most of these stops. We saw a mold being cleaned in a stopped press, and the log lists most repairs after a failure. Neither says what caused each stop. If this is wrong: a mold stops again soon after a planned cleaning, and the cause is in the press settings.
Stops that cleaning prevents	Planned cleaning prevents about five of the nine stops per week. Our estimate, set beside published cases of 60 to 80 percent less unplanned mold downtime. If this is wrong: the weekly count of stops on these molds shows it, and the figure follows that count.
Orders for the freed hours	Orders fill most of the press hours the fix gives back. We count 70 percent of freed hours as filled, because about one order in seven shipped late. If this is wrong: the presses wait for orders, and the saving is mostly the plastic.
Time and plastic per stop	A stop loses about 1.2 hours of press time and 25 pounds of plastic. Both are our estimates, because we did not see a mold fail and the downtime log counts stops, not the time to the next good part. If this is wrong: a stopwatch and the floor scale at the next ten stops give the plant its own figures.