Know How - Injection Molding

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Published: 12/27/2011

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.

Published: 11/28/2011

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.

Published: 10/25/2011

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.

Published: 9/30/2011

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.

Published: 8/23/2011

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.

Published: 5/31/2011

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.

Published: 4/25/2011

Feed-Throat Temperature Control
It's the 'zone zero’ for injection molding.

Published: 3/26/2011

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

Published: 2/23/2011

Pay Attention to Your Nozzle Body & Tip
These are overlooked components that can cost you thousands.

Published: 1/27/2011

Injection Molding: How to Set Second-Stage (Pack & Hold) Pressure
Most molders work with two parameters for establishing second-stage pressure. But within Scientific Molding there are actually four.