Device for processing a strand of plastic material

An apparatus for processing, constriction and severance of a strip of plastic material at specified longitudinal intervals, and for simultaneous closure of a casing, comprising a tool having two tool parts, each of the tool parts consisting of a plurality of segments that are movable against each other, wherein at least one of the tool parts consists of two sections that are separable from each other between closed and open positions and each of the two sections contains some of the segments and where one of said two tool parts is located above the other of said two tool parts in said closed position, and wherein in said open position, said other of the tool parts is located above said one of the tool parts and further comprising a polygonal housing for the sections, and wherein said plurality of segments rest against each other with at least one of segments' surfaces while a further surface is supported against sliding surfaces of said polygonal housing, and further comprising an actuating element that engages at least one of said plurality of segments and moves said at least one of the plurality of segments directly and the other segments indirectly into said closed position and said open position to server the strip of plastic material.