helix_3
Well-Known Member
Imagine you have a human scale mannequin mold, which fills from the feet. This is just an example shape, I'm not actually doing this in real life.
If you were to fill it with liquid resin (shown below), you would end up with voids because air gets trapped. You'd have to add sprues to allow proper venting of the trapped gas.
Now imagine an expanding foam was poured into the mold. Assume a back-pressure plate is added after filling, like what's shown in this Smooth-On video. Also assume it is poured down a single leg and pools in the head before kicking off.
Would the foam rise and fill the mold completely, or would trapped air again prevent the material from flowing into the hands? Could there be other complications as well, like the foam not flowing up both legs, etc?
If you were to fill it with liquid resin (shown below), you would end up with voids because air gets trapped. You'd have to add sprues to allow proper venting of the trapped gas.
Now imagine an expanding foam was poured into the mold. Assume a back-pressure plate is added after filling, like what's shown in this Smooth-On video. Also assume it is poured down a single leg and pools in the head before kicking off.
Would the foam rise and fill the mold completely, or would trapped air again prevent the material from flowing into the hands? Could there be other complications as well, like the foam not flowing up both legs, etc?