When the film first comes from the Die Head, it is molten. By blowing air through air pipes into the molten film, it turns into a bubble tube. Supported by Stabilizer / Blown Film Bubble Cage, the bubble tube is stretched up with a stable shape. Regarding the difference of materials, the Collapsing Frame offer wood and aluminum type for customers to choose. Reaching the top position where Take-Up Unit is, then pass through the nip rollers which are composed of a robber roller and a steel roller. The interaction between these two rollers squeezes all the air out from the bubble tube and makes it extremely flat without any wrinkles on it. Besides, the inverter and motor drive to offer a stable line speed (take-up speed) for the continuous pulling of the bubble tube. For customers who need the film with a gusset on both sides, it is available to equip with a gusset device as well.