Application of zippers to film material

Apparatus for applying a strip of zipper to a film (10) transversely to the direction of movement of the film, comprising means for causing the film to move continuously at constant speed, applicator means (14) to which the strip fastener is fed longitudinally and which are arranged to present the strip fastener to the film at a first location (a) and to advance the strip downstream at the same speed as the film, and a sealing means (24) arranged to move downstream at the same speed as the film to effect sealing of the strip to the film between said first location and a second location (B) downstream of said first location.