Forming shoulder and device for producing tubular bags

A forming shoulder for forming a packaging material web into a tubular bag having a laterally offset longitudinal seam, comprising a shoulder part and a prism part mutually connected along a forming edge, wherein a half of the forming edge which faces an incoming packaging material web lies in a first and a second quadrant of a cross section of the prism part, the laterally offset longitudinal seam is formed in a fourth quadrant, curve-free spatial straight lines in the second quadrant and the fourth quadrant, which radiate from the forming edge, converge with increasing remoteness from the prism part, and a forming edge angle measured between surfaces of the shoulder part and an inner side of the prism part decreases from the second to a third quadrant and increases again from the third to the fourth quadrant, whereby the longitudinal seam is generated eccentrically in relation to a cross section of the tubular bag.