Spout mounting method

A method of mounting a spout on a plastic film, the method comprising:

• feeding, and then stopping, the plastic film between a punch blade and a punch receiver that are disposed in mutual alignment with each other at a first position at opposite sides of the plastic film;
• mounting a seal head and a seal receiver in mutual alignment with each other at a second position at opposite sides of the plastic film, the second position being spaced apart from the first position by a predetermined distance;
• moving at least one of the punch blade and the punch receiver relative to, and toward, each other to punch an aperture in the plastic film at the first position, while the plastic film is stopped;
• feeding the spout to the seal receiver;
• jointly moving the seal head, the seal receiver and the spout through said predetermined distance to the first position overlying the aperture, while the plastic film is stopped;
• moving the seal receiver and the spout toward the plastic film to insert the spout into the aperture at the first position, while the plastic film is stopped;
• and
• moving the seal head toward the plastic film to seal the inserted spout in the aperture at the first position, while the plastic film is stopped.