A separator for separating portions from elongate casings stuffed with food mass, in particular for separating sausages from alginate casings stuffed with sausage meat, comprising two circulating conveyor members (22a, 22b) spaced apart from one another and drivable by at least one drive means, each having a conveying area which in operation is moved in a conveying direction, and a return area, wherein the stuffed casing can be introduced between the conveying areas of the two conveyor members (22a, 22b) and conveyed in the conveying direction, and wherein the conveyor members (22a, 22b) are oriented in such a way that the distance between the conveyor members (22a, 22b) in the conveying area decreases in the conveying direction, at least one crimping member arranged on each conveyor member (22a, 22b) and projecting laterally from the conveyor member (22a, 22b), wherein two crimping members of the spaced-apart conveyor members (22a, 22b) are shaped in such a way and arranged adjacent one another in the conveying area, and are moved toward each other when moved in the conveying direction, wherein the crimping member has an attachment portion for attaching the crimping member to the conveyor member (22a, 22b) and a crimping portion arranged adjacent the attachment portion, wherein the crimping portion has two legs (36, 38) that open from a base portion, wherein the flanks (36, 38) are curved on their side facing an adjacently arranged second crimping member in operation, such that the stuffed casing is first constricted in a constriction region with displacement of the mass and then severed, characterized in that the curvature is in the form of a convex curvature. comprising two circulating conveyor members (22a, 22b) spaced apart from one another and drivable by at least one drive means, each having a conveying area which in operation is moved in a conveying direction, and a return area, wherein the stuffed casing can be introduced between the conveying areas of the two conveyor members (22a, 22b) and conveyed in the conveying direction, and wherein the conveyor members (22a, 22b) are oriented in such a way that the distance between the conveyor members (22a, 22b) in the conveying area decreases in the conveying direction, at least one crimping member arranged on each conveyor member (22a, 22b) and projecting laterally from the conveyor member (22a, 22b), wherein two crimping members of the spaced-apart conveyor members (22a, 22b) are shaped in such a way and arranged adjacent one another in the conveying area, and are moved toward each other when moved in the conveying direction, wherein the crimping member has an attachment portion for attaching the crimping member to the conveyor member (22a, 22b) and a crimping portion arranged adjacent the attachment portion, wherein the crimping portion has two legs (36, 38) that open from a base portion, wherein the flanks (36, 38) are curved on their side facing an adjacently arranged second crimping member in operation, such that the stuffed casing is first constricted in a constriction region with displacement of the mass and then severed, characterized in that the curvature is in the form of a convex curvature.