Injection Know How

What to Calibrate on Your Press

There are different approaches to meeting the goal of making parts identically. At the heart of all them is the process or the machine setup sheet. My bet would be you cannot find two that are identical.

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best practices

Why Multi-Cavity Molds Fill Unevenly

Balanced filling is critical for making identical parts, achieving high CPKs, holding tight tolerances, and getting “good” data from design of experiments.

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processing tips

What Percentage of Barrel Capacity Should Your Shot Size Be?

The answer combines both experience and science, and it may be one of those molding details that gets overlooked but could be stealing a chunk of your profits.

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Plasticating Rates: Your Profits Are at Stake

To get the best cycle time you need the right machine, and few molders take the time to specify this critical component of the process.

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Calculate Shot Size Vs. Barrel Capacity

It may seem like a dull topic, but it will overcome the emotional experience that follows when you put a new mold into a machine and you find out there is not enough barrel capacity to make a full shot.

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best practices

Short Shots Redux

Deliberately making a short shot permits you to do a scientific molding viscosity curve. It will also prevent you from damaging the mold by overpacking if you set shot size incorrectly.

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Mold Filling Simulation: What, When, Why, How

Mold-filling analysis is the right direction to go, but if you want to arrive at your destination—good parts and an efficient process—you’ll need to pay attention to all the details and select an experienced professional to do the analysis.

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best practices

Screws and Pellets: One Size Does Not Fit All

Screw design, pellet type/size and material behavior are all critical issues to consider to deliver uniform melt to the mold.

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processing tips

Feed-Throat Temperature Control

It's the 'zone zero’ for injection molding.

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Why Non-Return Valves Leak

We all recognize that the non-return valve is a problem. The question is where is the research to figure out how to correct this so we have a better shot at making more consistent parts

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