Cold perforation pof shrink film If your packing machines have no needles to let air out, we can make cold perforation pof film at our factory, when it is used in your packing machines, the air can come out by itself from the perforations.We can make different lines of perforation according to customers demand. For example 2 lines, 3 lines, 4 lines and so on, and the distance between holes usually 5cm between lines and 2 cm between each holes inside one line. For example the photo below