Injection Know How
How to Get Rid of Bubbles in Injection Molding
First find out if they are the result of trapped gas or a vacuum void. Then follow these steps to get rid of them.
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Creating a Capable Process Using Process Capability
Know your Cp from your Cpk and how parts can meet dimensional specifications but still not be “capable.”
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Molders’ Block: Dealing With Foreign Materials in a Hot-Runner System
Understanding plastic flow can help you understand how foreign materials move—or don’t move—through your hot-runner system.
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How to Set Up Mold Protect on Your Injection Machine
Set the start position for mold protect where anything in the mold could be subject to damage.
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Understanding Fountain Flow in Injection Molding
The phenomenon of fountain flow affects almost every aspect of the molded product—starting with filling, extending to pack and hold, and ultimately manifesting in part defects like bubbles and voids.
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How Does Your Molding Machine Control Pack Pressure?
It seems some new machines have pack velocity issues, as machine builders are confusing processors with controllers that are more complicated than they need to be and less user-friendly.
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Rethinking Regrind
Regrind and recycled material are often requisite in projects these days, but for many molders, the “R” word triggers painful memories.
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Secrets of Quick Part-to-Part Changeovers
Part-to-part changeovers can be fast only with proper advance planning. Here’s what you need to know to convert from sluggish to swift in job changes.
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Apply the Power of a Troubleshooting Checklist to Your Process
Pocket guides provide processors an injection molding “crib sheet,” but in a process with thousands of interactions, applying if-this/then-that logic can’t always get you to a problem’s root cause.
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The Difference Between Knit and Meld Lines--and Why It Matters
In many part designs, flow fronts will inevitably be split, but how and where they come back together is hugely important to the molded part’s finished strength.
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