Plastic411: A Closer Look at Scientific Molding

 

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By Garrett MacKenzie

Plastic injection processing has experienced massive change in the last 20 years. The days of molding by time and pressure have given way to molding by position, peak pressure and process repeatability. Don Paulson, RJG and John Bozzelli were major pioneers in the development of decoupled and scientific molding as the procedures were developed and given structure. Plastic injection as an “art” gave way to plastics processing as a science of repeatability and standardization…..

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Bozzelli: Getting Good Data from DOE

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Dealing with so many variables can get confusing. One way to get a handle on them is to organize or categorize the processing variables into groups. To do this I use Don Paulson’s four plastic variables (Don founded Paulson Training Programs Inc.), but I change the word “variables” to “categories.” This helps separate plastic variables from machine variables. So I review the process problem relative to four categories of variables—from the point of view of the plastic: flow rate (encompassing shear rate and injection velocity); temperature; pressure; cooling rate and time…..
Click HERE to read John’s PTOnline article

Kip Doyle: Top 10 Reasons Why Molders Fail at Scientific Molding

scientificScientific Molding is a phrase that followers of John Bozzelli’s teaching and readers of his Plastics Technology columns should be familiar with by now. But what is Scientific Molding? And why do molders seem to have such a difficult time embracing its concepts?

The answer to the first question is straightforward: Scientific Molding is a practice for achieving optimal control of the injection molding process to deliver faster molding cycles, higher yields, and a more robust molding process. This optimal control of the molding process is realized by focusing mainly on the behavior of the material in the mold, rather than on the machine….
Click HERE to read this Plastics Technology article

Plastics Technology Article: Optimizing Your Molding Cycle

By Garrett MacKenzie

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It is possible for machines to run too fast—find the sweet spot where maximum output overlaps with good parts.

 

In today’s fast paced plastic injection industry, lean manufacturing is a primary driver of profitability. Without lean, organizations find their operations are sluggish and ineffective. This not only affects a company’s ability to successfully grow and prosper, but the capability of taking on new work also suffers because current systems have not been effectively streamlined. This article addresses cycle time optimization, outlining the different variables within the molding process that can be used to maximize profits.

 

One of the first points that needs to be made when addressing this topic is to acknowledge that it is possible for machines to run too fast. Every molding job is different, and the following conditions must be satisfied to properly assure that the optimization is successful……

 

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Injection Molding 5 Lessons Learned– Steve Bremmer

Oftentimes in molding the same lesson has to be learned over and over the hard way, which is why I’m such a fan of utilizing high quality training for everyone who touches a molding machine. The following items are some basic lessons learned that I have seen repeated over the years…..

https://www.linkedin.com/pulse/injection-molding-5-lessons-learned-steve-brammer?trk=hp-feed-article-title-like

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