Corrugated Plastic

Hi. I’ve been a big fan of corrugated plastic for several years. If you’re not familiar with it: think of a cardboard box, but instead of cardboard, the sides are made of plastic.  Since the plastic is shaped into cells like the cardboard, it provides great rigidity while being light.  And it’s superior to cardboard boxes since it’s waterproof/resistant.

Is anyone familiar with a Precious Plastics way of creating corrugated plastic sheets?  I don’t want to create an extrusion method from scratch if someone has already been successful.