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Using a silicone mold with the injection machine

  • This topic has 3 replies, 2 voices, and was last updated 1 year ago by Stan.
Ben benbaronhanoi

Using a silicone mold with the injection machine

16/06/2020 at 17:46

I want to make a mold with silicone because it’s much cheaper than metal, but I’m worried about the compression. I talked with a silicone expert, and he has a silicone which can withstand high temperatures. I tested it by extruding plastic onto a piece, and it held up. This guy says he can make a mold of the object I want to create which is a roughly 12 cm diameter ball. He can make the mold for about 50 USD. Has anyone tried using silicone molds? If so, how did you ensure a proper seal and connection to the injection nozzle, and how did you reinforce the silicone so it wouldn’t warp or move when pressure was applied from the plastic filling the mold? Any ideas are welcome, thanks

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17/06/2020 at 22:38

If you are going to use an injection machine, there is a lot of pressure. Even if you encase the mold in something rigid, I’m not sure you can hold shape or detail.

Also, a 12 cm sphere is about 900 cc. That is a lot for an injection machine.

18/06/2020 at 17:41

Hi s2019, thanks for your thoughts. If injecting doesn’t work for this, we might try just putting the mold in an oven and adding shredded flakes until it’s full. I’m worried about air bubbles with that method but it’s worth a shot. If you have any ideas for how to make this sphere, would be interested to hear. Cheers

19/06/2020 at 19:52

If it is a smooth sphere, for a low cost mold you could try one of these, Carefully cut it in half and encase each half in something strong like mesh reinforced concrete and a steel box.
I’m not sure how you avoid bubbles or voids. I think the compression approach would do several flat melt/press/fold cycles and then compress in the mold. Probably depends on how efficient the process needs to be and how many you want to make.

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