Method for producing a packaged portion of a food product and portion produced by said method

A method for producing a packaged food product portion, the method comprising the following steps:

• providing a cup defining an inner area receiving a food product,
• cold pouring, at a temperature below 50° C., the food product into the inner area of the cup,
• covering the food product using a lid arranged such that thermally conducting flaps of the cup, which are thermally conducting, extend outside the lid after the covering step,
• folding the thermally conducting flaps on an outer face of the lid opposite the inner area of the cup, and
• heat-sealing the thermally conducting flaps on the outer face of the lid,
• wherein the lid is thermally insulating and the lid is made up primarily of expanded plastic,
• wherein the step for heat-sealing the thermally conducting flaps on the outer face of the lid comprises a pre-sealing step and a final sealing step,
• the pre-sealing step comprises applying a first hot sealing iron on the thermally conducting flaps, the thermally conducting flaps being inserted between said first hot sealing iron and the lid, the first hot sealing iron pressing the thermally conducting flaps of the cup against the lid, and
• the final sealing step comprises applying a second hot sealing iron on the thermally conducting flaps, the thermally conducting flaps being inserted between said second hot sealing iron and the lid, the second hot sealing iron pressing the thermally conducting flaps against the lid,
• wherein said pre-sealing step and said final sealing step further are successive applications following one another within a time interval of less than 2 seconds,
• wherein the first hot sealing iron and the second hot sealing iron are distinct from one another, the first hot sealing iron being removed between the pre-sealing step and the final sealing step,
• wherein the cup comprises a single sheet, the single sheet having a multilayer structure comprising:
• a main layer made from metal, defining an inner face of the single sheet, oriented toward the inner area of the cup, and an outer coating deposited on a face of the main layer opposite the inner face of the single sheet and defining an outer face of the single sheet oriented away from the inner area of the cup,
• wherein the main layer makes up more than 70% of the thickness of the single sheet, and the outer coating comprises a layer of non-thermo-adhesive lacquer,
• wherein the inner face of the single sheet is covered with an inner coating separate from the single sheet, the inner coating comprising a thermo-adhesive layer, defining an inner face of the coating oriented toward the inner area of the cup, and
• wherein the lid has a multilayer structure comprising:
• a main layer made from expanded plastic and an outer coating, the main layer making up more than 90% of the thickness of the lid, and the outer coating comprising a metal layer.