scientific molding
Injection Molding: How Repeatable is Repeatability?
Process repeatability is not a constant, but varies over time in response to a number of variables. That variation is not captured by a snapshot in time—measuring a discrete sample of parts. And the only way to manage that variation is with process controls that adjust each and every cycle.
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Injection Molding: Time for Another Look at Non-Return Valves
First and foremost, they must seal properly, and check valves with stepped angles or radiused seats perform the best.
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Materials: Cycle Time: Science vs. Rules of Thumb—Part 2
Understanding cooling—how a given material develops modulus as it solidifies—requires access to data that provides some insight into the relationship between modulus and temperature. Dynamic mechanical analysis is a helpful tool.
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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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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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Block Cavities and Keep Molding
It goes against conventional wisdom, but molding with blocked cavities can be done while maintaining quality with the help of appropriate in-cavity sensors and process-control software.
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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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Use Molding Simulation To Avoid Surface-Finish Defects
It’s not just for successful mold filling and cooling. Simulation can help predict and overcome cosmetic defects in molded parts.
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How to Pick, Remove, and Replace a Nozzle Tip
This small component can cause big problems. Here’s my procedure for picking and replacing yours.
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