Tubular-bag machine, which is in particular a horizontal tubular-bag machine, and which serves to package objects by means of a packaging film, having a conveying device for conveying objects, which are intended to be packaged by means of the tubular-bag machine, in a conveying direction; a device (50, 43) for producing a packaging tube, extending in the conveying direction, from a packaging film; a longitudinal-connection apparatus (53, 54) for producing a longitudinal connection of the packaging tube along a longitudinal peripheral film region of the packaging film; a cross-connection apparatus for producing cross connections in the packaging film, which extend substantially transversely to the longitudinal connection; and a gas-setting apparatus having an insertion head for engaging in the packaging tube transversely to the conveying direction, wherein the insertion head has a first gas passage orifice for discharging a gas from the packaging tube, said first gas passage orifice being connected to a vacuum source, wherein the insertion head has at least one second gas passage orifice for feeding a gas into the packaging tube, said second gas passage orifice being connected to a gassing device, characterized in that the insertion head has a first uninterrupted contact face and a second uninterrupted contact face, wherein the first contact face serves to support a first side face of the packaging tube and the second contact face serves to support a second side face, located opposite the first side face, of the packaging tube, and wherein the first gas passage orifice and the second gas passage orifice are arranged between these two uninterrupted contact faces, and the insertion head has a first wedge-shaped portion, within which the first contact face and the second contact face approach one another in a wedge-like manner in the longitudinal direction, characterized in that the insertion head has a second wedge-shaped portion, within which the first contact face and the second contact face approach one another in a wedge-like manner in an opposite direction to the longitudinal direction. a conveying device for conveying objects, which are intended to be packaged by means of the tubular-bag machine, in a conveying direction; a device (50, 43) for producing a packaging tube, extending in the conveying direction, from a packaging film; a longitudinal-connection apparatus (53, 54) for producing a longitudinal connection of the packaging tube along a longitudinal peripheral film region of the packaging film; a cross-connection apparatus for producing cross connections in the packaging film, which extend substantially transversely to the longitudinal connection; and a gas-setting apparatus having an insertion head for engaging in the packaging tube transversely to the conveying direction, wherein the insertion head has a first gas passage orifice for discharging a gas from the packaging tube, said first gas passage orifice being connected to a vacuum source, wherein the insertion head has at least one second gas passage orifice for feeding a gas into the packaging tube, said second gas passage orifice being connected to a gassing device, characterized in that the insertion head has a first uninterrupted contact face and a second uninterrupted contact face, wherein the first contact face serves to support a first side face of the packaging tube and the second contact face serves to support a second side face, located opposite the first side face, of the packaging tube, and wherein the first gas passage orifice and the second gas passage orifice are arranged between these two uninterrupted contact faces, and the insertion head has a first wedge-shaped portion, within which the first contact face and the second contact face approach one another in a wedge-like manner in the longitudinal direction, characterized in that the insertion head has a second wedge-shaped portion, within which the first contact face and the second contact face approach one another in a wedge-like manner in an opposite direction to the longitudinal direction.