Piping bag for dispensing a viscous mass of foodstuff

A piping bag for dispensing a viscous mass of foodstuff, wherein:

• the piping bag comprises a flexible circumferential boundary wall of a film material,
• the circumferential boundary wall is extending circumferentially around a longitudinal direction of the piping bag,
• the piping bag comprises a filling end and a dispensing end, which are lying mutually opposite in said longitudinal direction,
• a dispensing direction of said piping bag is defined as extending along said longitudinal direction from said filling end towards said dispensing end,
• the piping bag along at least a part of the longitudinal direction is narrowing in said dispensing direction,
• wherein
• the circumferential boundary wall comprises a dispensing opening structure, which is elastically deformable, and which comprises a first plate and a second plate, wherein:
• each of the first plate and the second plate:
• is elastically deformable,
• is located at a dispensing end portion of the piping bag, wherein said dispensing end portion includes said dispensing end of the piping bag,
• is fixed relative to said film material of said flexible circumferential boundary wall,
• the first plate has a first pair of first longitudinal opposite side edges, which in said dispensing direction are mutually converging, whereby the first plate is narrowing in said dispensing direction,
• the second plate has a second pair of second longitudinal opposite side edges, which in said dispensing direction are mutually converging, whereby the second plate is narrowing in said dispensing direction,
• the respective first longitudinal opposite side edges of the first plate are parallel to the respective second longitudinal opposite side edges of the second plate,
• the first plate and the second plate are fixed relative to one another along the first longitudinal opposite side edges and the second longitudinal opposite side edges, wherein the respective first longitudinal opposite side edges of the first plate are fixed relative to the respective second longitudinal opposite side edges of the second plate, in such manner that the dispensing opening structure has:
• a closed condition in which the first plate and the second plate are each in an elastically relaxed condition in which the first plate and the second plate are straightly planar and are extending alongside one another in a mutually parallel manner, whereby the first plate and the second plate are creating a closure of said dispensing end portion of the piping bag, wherein said closure prevents a viscous mass of foodstuff inside the piping bag to be dispensed from the piping bag in that said viscous mass can not pass between the first plate and the second plate, and
• an open condition in which, under influence of a user pressurizing said viscous mass within the piping bag, the first plate and the second plate are each in an elastically tensioned condition by being elastically deformed, relative to said elastically relaxed condition, in a circumferentially curved manner around the longitudinal direction of the piping bag, whereby in-between the first plate and the second plate a dispensing passage is automatically created so that said viscous mass may be expelled, via said dispensing passage, from the piping bag.