| 摘要 |
A station (S) of application of segments of opening/closing strip on plastic web films suitable to form bags, comprising punching means (U14, U22) of predefined areas of the plastic film for the access to areas of the segments through the film, and welding means (U15, U23) of the strip segments at intervals on the plastic film, wherein the punching means (U14, U22) and the welding means (U15, U23) are positioned along the flow path of the film to act in sequence on the same area in order to, respectively, punch the film and weld the segments in the predetermined points of the plastic film. In particular, the station (S) comprises two operating units (U1, U11; U2, U21), suitable to cooperate from opposite sides with the plastic film, each of which provided with the punching means (U14, U22) and the welding means (U15, U23), angularly staggered with respect to the punching means (U14, U22), and operatively connected with translation means (U31) that move at least one of the operating units (U1, U11; U2, U21) to bring them closer and separated, allowing the execution of the punching of the plastic film by the punching means (U14, U22) and the welding of the strip segment in the punched area of the plastic film, and with motorization means (U12, U21) that rotate the operating units (U1, U11; U2, U21) around longitudinal axes for selectively and alternately arranging the welding means (U15, U23) and the punching means (U14, U22) facing to the plastic film. |
