Plastic Bottle Molding Machine These are special machines that help to create plastic bottles. These machines use molding to form liquid plastic into bottles. It’s almost instantly and you can line up as many bottles as you want thus save tons of energy and time. Molding machines are great at making hundreds of bottles quickly. Working with lightning speed, they can produce many bottles at once. “The beauty of that is that companies can save money, because they can create bottles more quickly and more intelligently.”