Situation: I was recently at a molding facility with relatively new molding machines, but the safety window was all hazy, and the paint is already dulled. When I asked around, it turns out the technicians were using mold cleaner to clean the machines including the safety glass. Cause: The technicians did not realize that the solution used […]
Category Archives
Plastics Technology
Safely Removing Stuck Runners…
Last week, while at a molding facility, I had to instruct a molder on the safe way to remove a stuck runner… Situation When touring the plant, I witnessed a machine operator removing opening the door, reaching in with his bare hand, and pull a stuck sprue from the bushing. Problem This action by itself […]
Open-Loop and Closed-Loop Process Sheets…
I was recently at a customer with both open-loop and closed-loop molding machines… BD Can a standard, machine-independent, process sheet be used for all our molding machines? My Response In this case, the best way to process an open-loop machine is much different than a closed-loop molding machine. An open-loop machine should be full at […]
Volumetric or Gravimetric Feeder?
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Avoiding Check Ring Leakage…
I was recently asked this question… Joe How do I avoid check ring leakage? My Response Many heated discussions have arisen as a result of check ring leakage, but the simple fact is: All check rings allow some plastic back-flow (leakage). There are specialized products on the market which try to eliminate check ring leakage, but they eventually cause excessive barrel wear… resulting […]