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Groucho

Converting A Injection Mold To A Hand Pour

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A hand pour mold needs a larger sprue hole, and one for each cavity.  You need to be able to have a steady stream of hot plastic pour into each cavity, to fill from the bottom up.

Trying to handpour a multiple cavity injection mold will almost certainly result in unfilled cavities, because the plastic will cool in the shared sprue before it fills each cavity.  

This problem is why injecting was invented in the first place.

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There was 2 reasons I went to hand pour maybe not good reasons now First is I use bead medium in my pour instead of salt for weight and didn't want to scar the injector. Secondly don't you have to take your injector apart everytime you make a pour. I can see if your in production but if you have a one cavity or two cavity mold it seems like a lot of time wasted. Now I don't mine wasting time but like to be a little efficient too. I grant you I haven't ever used an injector so I might like one. I'm just doing plastics for myself and friends. Thanks

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