gas injection

Is the tool designed yet?

Can the injection needle be retracted and a sliding pin (like an ejector) push across to press the plastic over the hole...

Hmmmm that sounds pathetic..., but hey ya gotta have the bad ideas to get the good ones too.

Thak you for your cooperation!

We will use a Gunther System.

We will use a Gunther System.

Presumably ..so called 'cos that's gunther do for now?

Which plastic?

ABS, PVC and polystyrene can be sealed by sending in a tiny globule of semi-dissolved plastic held in a solvent such as 2-butanone/butan-2-one (call it MEK if desired - it's the same stuff) for polystyrene, though ABS/PVC pipe cement would do the job for all three of them.

If the part is polyethylene or polypropylene, sealing the hole with some sort of heat device like a soldering iron (or maybe something more elegant) would do.

Other plastic? Others can chip in....

Does that help?

use vacuum to mold the part then you have a projection on the outside of the part no hole

ok, here's an idea, but can I have a piece of the patent?

design the needle injection/retraction point through essentially a hot runner area - sequence the activity so that the needle is retracted through hot plastic after the gas injection then freeze the aperature -

Jim

-opinions free; worth twice the price -

just wondering - how did this ever work out?

Jim

Heated needle as the needle is with drawn the melted plastic will be force into the hole vacated by the needle. Should reseal itself if the internal pressure of the injected gas is not to great. Temperature of the needle will need to be controlled if too cool the plastic will not become tacky to hot and it will scorch the plastic. You didn't say what gas hope it's not flammable.