Injection Know How
PART 2: The Importance of Consistent Fill Time
To make identical parts, you need to keep fill time constant. In part one we covered the why. Here’s the how.
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Part 1: The Importance of Consistent Fill Time
To make identical parts, you need to keep fill time constant. Here’s why.
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Identifying and Correcting Splay
Splay adjustments can be a simple fix, or can require several hours of babysitting a press and head scratching. Learn to find the root cause.
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Injection Molding: Sliding vs. Locking Ring—Which Non-Return Valve Is Right for You?
The locking-ring style appears to dominate the market, as most believe it makes a make a better seal and leaks less. But is this really so?
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Injection Molding: Is There a ‘Most-Important’ Process Parameter?
A case can be made for multiple variables—fill balance, fill time, injection pressure, cavity pressure—as most important. But there is something else altogether that is essential to successful injection molding.
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Injection Molding: Fill Based on Volume, Not Weight
Most parts should be 90-99% full after first-stage—by volume not weight. Here’s why that’s important and how to make a first-stage-only part.
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Injection Molding: Safety First—Know the Compatibility of Different Resins
Certain materials don’t play well together when mixed. So it’s best not to. Here are some guidelines.
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Injection Molding: Process Documentation Is Crucial to Making ‘Identical’ Parts
Use a machine/mold setup sheet to document plastic parameters and use them on any acceptable machine into which the mold is placed.
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Injection Molding: A Practical Approach to Calculating Residence Time
Toss the formulas. The best way to determine residence time is to conduct a simple experiment.
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Injection Molding: How Backpressure Adjustments Influence Shot Size
Raising backpressure results in increasing shot size, which can cause a host of other problems.
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