How plastic barrels are made - GIF

How plastic barrels are made.

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Previously:

How drum barrels are made - GIF
How wooden barrels are made - GIF
Making Oktoberfest beer barrels - GIF
Making wine barrels - GIF

Blow molding - they do this for containers significantly larger than this one.

Here is a video for a 10,000 liter (2641 gallons) tank:

https://www.youtube.com/watch?v=W-iEGh0Mq-E