Manufacturing process for producing hermetic single-use food containers using a sealing head having a specific profile with a rib

Hermetic single-use food container, including a container body with a peripheral rim, and a closing lid closing the container body comprising:

• the container body is made in a paper-laminated material and has wrinkles at least at the rim, the wrinkles extending essentially radially, and
• the hermetic single-use container shows an annular sealing groove engraved on a side of the rim which extends continuously essentially in a circumferential direction all around the rim and which has a depth at least equal to a maximum depth of the wrinkles whereby the wrinkles are flattened by the sealing groove, the closing lid being bound to the rim of the container body at least in the region of the sealing groove.

Coffee pod that includes a hermetic single-use food container including forming a container body having a peripheral rim, placing the container body in a sealing head having a first die and a second die, at least one of which being mobile, the first die and the second die having cooperating annular sealing surfaces facing the rim, applying a closing lid over the container body, sealing the closing lid with the rim of the container body by applying the first die and the second die one against the other, and the first die is provided with an annular rib in its sealing surface, the rib having a height which is at least equal to a maximum depth of wrinkles that might appear on the rim upon forming the container body, whereby a sealing groove is formed by the rib in a side of the rim when sealing the closing lid to the container body, the closing lid being bound to the rim in front of the sealing groove.