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Author Topic: Injection molds  (Read 902 times)

Offline Mhorvitz83

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Injection molds
« on: 06/08/20 16:15 UTC »
I designed a mold on CAD and am wondering if the sprue is too small. The sprue funnels down to about 1 mm in diameter, and I’m afraid the plastic won’t inject properly.
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Offline ctom

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Re: Injection molds
« Reply #1 on: 06/08/20 18:07 UTC »
Welcome to the Do-It forums Mhorvitz83.

1mm isn't much room for plastic to freely flow. Can you take a picture of the gate and say the first half inch of the bait without giving away the bait itself? I'll hazard a guess that you'll need to substantially incease the gate size unless the bait it a very small ice fishing type of bug, but even them 1mm is very small for a gate.
« Last Edit: 06/08/20 19:17 UTC by ctom »
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Offline WALLEYE WACKER

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Re: Injection molds
« Reply #2 on: 06/08/20 18:30 UTC »
If It was me I’d look at the size of gates in relation to the size of the bait on different molds. Better to have to much than not enough but I could be wrong.
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Offline Apdriver

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Re: Injection molds
« Reply #3 on: 06/08/20 18:32 UTC »
Second the too small at 1mm. As the plastisol cools it needs room to draw from the runner so the bait won’t dent. If the gate is too small it will close off and freeze not allowing contractional cooling bait to draw plastic as it cools. This will most likely be your limitation on gate size.
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