Blown Film is a manufacturing process that produce films of plastic sheeting and tubes. These sheets or tubes can either be fully cylindrical, or have other object inserted into them so they form useful objects like shopping bags, rubbish bags or cling wrap. In this article, we will explore what the process of blown film is and how and why you would use it. The process of blown film is reasonably simple. First you must take plastic pellets and heat them to their melting point (like injection moulding).