Abstract: A packaging container (1) includes a housing part (21) that houses a content, a flange part (22) provided on an outer circumference of an opening of the housing part (21) integrally with the housing part (21), a sealing ridge (23) provided on a top face of the flange part (22), annularly formed over an entire circumference of the flange part (22) so as to be protruded upward, and having a first protrusion (23a) that protrudes outward in a plane direction of the flange part (22) at a position corresponding to an opening start part, and a second protrusion (24) provided on the top face of the flange part (22) so as to be protruded upward, and forming a gap along an inner face of the first protrusion (23a) on an inner circumferential side of the first protrusion (23a) of the sealing ridge (23).

Abstract: A method of producing a thickened carbonated beverage packed in a container, comprising: mixing an aqueous solution containing a first thickening agent and having a temperature of 0 to 35° C. with a second thickening agent insoluble in water in a temperature range of 0 to 35° C. but soluble in water at a temperature of 60° C. or more to obtain a stock liquid with the second thickening agent dispersed in the solution; dissolving carbon dioxide gas in the stock liquid to obtain a carbonated aqueous solution; filling a container with the carbonated aqueous solution and sealing the container to obtain the carbonated aqueous solution packed in the container; and heating the carbonated aqueous solution packed in the container such that the carbonated aqueous solution has a temperature of 60° C. or more to dissolve the second thickening agent in the solution.

Abstract: A method of producing a thickened carbonated beverage packed in a container, comprising: mixing an aqueous solution containing a first thickening agent and having a temperature of 0 to 35° C. with a second thickening agent insoluble in water in a temperature range of 0 to 35° C. but soluble in water at a temperature of 60° C. or more to obtain a stock liquid with the second thickening agent dispersed in the solution; dissolving carbon dioxide gas in the stock liquid to obtain a carbonated aqueous solution; filling a container with the carbonated aqueous solution and sealing the container to obtain the carbonated aqueous solution packed in the container; and heating the carbonated aqueous solution packed in the container such that the carbonated aqueous solution has a temperature of 60° C. or more to dissolve the second thickening agent in the solution.

Abstract: A container-filled beverage for a person with swallowing difficulty, which contains a thickening agent, has a viscosity of 50 mPa·s or more, and is filled in a light-shielding container.