an adjustable support 29 which is set so that the zipper profiles 23 will be accurately centered while a film is shown where the zipper is spaced substantially equally intermediate the edges the profiles can be closer to one edge than the other and the machine can be quickly set by changing the location of the guides 25 and 28 as the opened film sheet ascends it passes spreader rollers 33 and 34 which help flatten the sheet the sheet then is turned 90 u00b0 over an upper roll 35 the roll 35 as shown in fig2 and 5 is provided with a groove 36 at its center to accommodate the extra thickness of the zipper profiles 23 the flattened sheet 32 then travels horizontally over rolls 40 and 41 thereafter the sheet passes downwardly over a roll 42 which guides it up an inclined ramp 44 rolls 41 and 42 are driven and 40 is an idler roller the roll 42 is constructed and driven so as to maintain slack and lack of tension in the film 32 an additional roll 43 is positioned at the base of the ramp 44 the advancing and guide rollers 41 and 42 are driven by sprockets at the ends of.