Know-How
How to Collect and Interpret Extrusion Process Data; Part 3
In this final installment, learn how process data can be used to identify and fix extrusion issues.
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Tooling: Reducing the Mass In Sprue Bushings
Important and frequently overlooked details of sprue-bushing design can improve the process and profits for an injection mold.
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Extrusion Cooling: It’s All About Turbulence
Regardless of what you are extruding, in order to maximize cooling you need to generate turbulence at the heat-exchange surface.
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Injection Molding: Are You Using More Than 65% Of Your Barrel Capacity?
If you are, you are inviting Murphy—as in trouble—to the party.
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Sharper Dies Make for Smoother Extrusions
Dies that have a radius at the exit will result in poorer surface finish.
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Clamp Tonnage: More Is Better...Right?
Determining the correct tonnage provides a foundation that must be rock-solid to avoid flash and damage. But applying excessive force can create problems with the part, mold, and machine.
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Cycle Time: Science vs. Rules of Thumb, Part 1
What temperature must the polymer reach so the part can be ejected from the mold? Here, more than for any other variable, ‘rules of thumb’ unfortunately prevail.
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Locating Rings, Platen Damage, and the Center of Gravity: Part 3
Selecting the right locating ring and putting it to good use takes careful consideration.
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Sizing the Barrier Gap
Here’s a less complex way to properly size the barrier gap for barrier screws.
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How to Duplicate a Process From Press to Press
To adopt the right approach you must distinguish between machine and plastic parameters.
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