METHOD FOR PRODUCING A PLASTIC DRAINAGE SHEET AND PLASTIC DRAINAGE SHEET

摘要

The invention relates to a method for producing a plastic drainage sheet and to a plastic drainage sheet. For the production, a sheet-shaped main body (2) having a first surface (5) and a second surface (6) spaced apart from the first surface by a main sheet thickness is provided. Grooves (7) are formed in the first surface (5), and counter grooves (8) are formed in the second surface (6). The counter grooves (8) and the grooves (7) cross at crossing points (9). Passage openings (10) between the grooves (7) and the counter grooves (8) are formed at the crossing points (9).