Talk:Blow molding

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I agree - we need to combine "Blow Molding" and "Blow Moulding."

I prefer the spelling without the "U"! : )

[edit] Blow molding for under water toy

Since I know nothing (yet) about plastic manufacturing, I have a question. I want to make a small cheap toy that would be submerged all the time in water but it needs to float. Is blow molding or foam the way to go? I like the look of plastic over foam but I don't want it to leak. It won't be like a bottle with an opening. Must be sealed but hollow.

You can make it with blow molding process and seal it.

My company makes a dishwasher safe blow molded case, we glue a little plug in it. We have a history of decoys which float on water, we just heat the blow tube (the opening in the mold through which the air is induced) until it melts then apply pressure from a cooled piece of aluminium. Another option would be to roto-mold it, this would probably be the easiest, albeit a lengthier cycle time. Resins are poured into the mold, the mold clamped shut and rotated in an oven until the resin sets up and voila, a sealed, hollow part.