A belt conveyor (1), a belt conveyor system and a box template production system. Said belt conveyor comprising an endless loop of belt (3) which is rotating about at least two pulleys (5a, 5b) comprised in the belt conveyor, whereby different parts of the belt (3) will constitute an upper surface (7) for transporting goods during run, the belt conveyer (1) further comprising a frame (9) holding said at least two pulleys (5a, 5b) and a belt supporting device (11) configured for supporting the belt between the at least two pulleys while allowing the belt (3) to slide over the belt supporting device (11), wherein said belt (3) comprises a substantially plane middle part (13) along the length of the belt and two edge areas (13a, 13b), one provided on each side of the middle part (13), wherein at least one of said edge areas (13a, 13b) is sloped towards an opposite part of the belt in the endless loop at least when said at least one edge area (13a, 13b) constitutes a part of the upper surface of the belt.