The main difference is where the material is fed. For the upper paper, because the film is wrapped from top to bottom, there may be some cases where the material cannot be delivered in place, that is, if it cannot be sent to the top of the film, it cannot go with the film. May cause some problems with clamping. If the paper is fed down, the film comes out from below. When feeding, the push rod is pushed directly onto the film, and the product follows the film directly, thus reducing the material clamping.