Even as municipalities mull banning them, plastic bags will probably remain an indispensable part of our lives. Our usage of them goes way beyond the handled variety given out at stores: We buy food packaged in plastic bags, save leftovers in Ziplocs, throw garbage out in them.
You probably realize that like all plastic goods, plastic bags start out as pellets. But how do manufacturers turn pellets into, say, aforementioned Ziplocs? Take a look:
We’re showing you this video to broaden your manufacturing knowledge, not to endorse plastic bags. Don’t worry, up next we’ll cleanse your palate with some useful plastic recycling information.
http://www.core77.com/posts/53618/How-Plastic-Bags-are-Made