This invention relates to a process of continuously applying reinforcing tapes from synthetic resin on the longitudinal sides of plastic sheets, an apparatus for carrying out said process, a product obtained by means of said process and one application of said product. The apparatus according to the invention comprises: a roller support (1) from which the starting plastic sheet (2) is continuously rolled; a first series of rollers (3) on which said sheet (2) is advanced; at least two extruders (4) whose extruder heads (4a) are each in face-to-face relationship to the longitudinal sides of said sheet above the plane formed by the first series of rollers (3); at least two punches (7); at least one pressure roller (8) cooperating with one of said rollers (3); a second series (9) of rollers feeding said sheet (2), said rollers being disposed in a plane lying at a level lower than that of rollers (3) and being placed in a tank (10) containing coolant water; and a second roller support (12) on which said sheet is rolled once the process is completed. Application to the manufacture of plastic sheets adapted to serve as protective coverings for rows of vines or for floriculture.
