Although true SMED (Single Minute Exchange of Dies) is not likely for all molders, significant reductions in mold change time using the same principles are easily attainable. Question: Is SMED realistic? My Response: The underlying benefits to the SMED concept is the preparation. Essentially everything necessary to change a mold is already there and ready […]
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Routsis Training
Converting Injection Speed…
This is a good starting point, but the most important factor is to know the 1st Stage Fill Time and 1st Stage Short Shot Weight. If these are matched, then the outputs match which is critical. Question: Say i have a process with .94sec fill time and 36mm screw. When i change to a 50mm screw, […]
Correcting Tiger Striping…
When these are in the mold surface, small changes such as reduced melt temperature, slower injection speed, and reduced packing pressure tend to help. These reduce the polymer’s ability to duplicate the cavity detail will improve the overall appearance, but do not fix the underlying problems. Question: Are Tiger Stripes Solvable? All the processing changes […]
Weld Line Strength…
Weld line strength is primarily influenced by the amount of interaction that can be caused at the weld line location. Gas traps and low pressure at the weld line location are some of the primary causes for low weld line strength. Concern: I am having some issues with one of our newer molds. We are […]
High Temp Machinery…
Just because a machine is capable of processing at high temperatures, does not mean it is optimized for use at these temperatures. A machine which spends most of it’s time at high temperatures should be purchased and designed for that intent. A failure to do so will result in potential inefficiencies and premature equipment failure. […]