Manufacturing corrugated tubing - GIF

Manufacturing corrugated tubing.

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Previously:

Corrugated pipe extruder - GIF
Making a corrugated elbow - GIF
Molding corrugated pipe - GIF
Splicing corrugated tubing - GIF
Three tractors burying corrugated pipe - GIF

Can't see what forces the plastic into the ribbed moulds but suspect some vacuum system at the beginning.

I think it's pressurized air... you can see the 2 large holes in the middle of that large nozzle that extruding the plastic at the start. They seal off the end and then start going.
Altho, I also see the tubing on the outside, so there's a chance it also uses vacuum on the outside at the same time. Perhaps it's both.

Quote:

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Originally Posted by KustomsbyKent

I think it's pressurized air... you can see the 2 large holes in the middle of that large nozzle that extruding the plastic at the start. They seal off the end and then start going.
Altho, I also see the tubing on the outside, so there's a chance it also uses vacuum on the outside at the same time. Perhaps it's both.

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I noticed those two large holes and initially thought compressed air, but the end of the tube is shown not sealed thus allowing the air to escape.