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How are these shaped?

PostPosted: January 26th, 2018, 5:43 pm
by Wosh
Image

I've seen some grainy videos from some time ago about the extrusion and coiling production of a basic plastic Slinky, but can't find anything on the shaped versions above.

My initial thought was that they were maybe pressed into shape from a blank cylindrical Slinky, but after inspecting one, I couldn't see any parting lines if it were a mold. Can they coil the plastic extrusion straight into those shapes, like the star for example?

Any help would be appreciated!

Re: How are these shaped?

PostPosted: January 26th, 2018, 9:25 pm
by Cyberdemon
I suspect the coil that the material collects on is just wrapped onto a shaped coil instead of the usual cylindrical one and the material flows around it OK. The corners still have fairly generous radii.

Re: How are these shaped?

PostPosted: January 31st, 2018, 12:14 pm
by ralphzoontjens
The best shape control is most likely to have the extruder head bend these directly into shape. From what I have seen factories do with CNC bending and pasta extrusion, that may very well be possible.

Re: How are these shaped?

PostPosted: February 4th, 2018, 6:39 pm
by Wosh
Thanks guys.

Not sure why my initial thought was to press it into shape. Gotta love a nice, generous radius.