The invention relates to a roll take-up device (110) designed for • a) taking up a sheetlike composite (101), and • b) rolling up or unrolling or both rolling up and unrolling a roll (102) of the sheetlike composite (101); • i) a carrier layer (304), • ii) a barrier layer (306) and • iii) an inner polymer layer (308); wherein, in the roll (102), at least 10 laminas of the sheetlike composite (101) are overlaid on one another from the inside outwards or vice versa; wherein the laminas respectively have the series of layers (304, 306, 308); wherein one layer (306) of the series of layers of the sheetlike composite (101) is an electrically conductive layer.