A device for mixing hermetically substances, comprising a capsule, containing in sequence: a storage compartment, adapted to the storage of substances to be mixed with a content of a bottle; a sealing platform; a sealing film secured to the sealing platform at an outer edge of the sealing film; a crown compartment and an inlet compartment; fillets, adapted to the screwing of the bottle, formed in said inlet compartment; the device further comprising: a crown positioned in the crown compartment; characterised in that the crown contains a set of blades for cutting the sealing film; wherein the crown further comprises a plurality of flaps and projections, a groove and a recess; wherein the fillets are interrupted by guides, compatible in the positioning, thickness and height with said projections, whereby the projections, inserted inside the guides, cause the crown to move in the axial direction, avoiding its rotation on its own axis when the bottle is screwed into the capsule; wherein the flaps are able to maintain the crown fixed in the crown compartment; wherein the groove, positioned at the top of the crown, interrupts the set of blades and provides a space for a small portion of said film which is not ruptured by the blades, whereby the groove enables holding the sealing film connected to said device; wherein a recess is positioned in an inner portion of the crown providing a larger space to accommodate the sealing film after its rupture, and giving freedom of movement to the film after it is cut. a storage compartment, adapted to the storage of substances to be mixed with a content of a bottle; a sealing platform; a sealing film secured to the sealing platform at an outer edge of the sealing film; a crown compartment and an inlet compartment; fillets, adapted to the screwing of the bottle, formed in said inlet compartment; the device further comprising: a crown positioned in the crown compartment; characterised in that the crown contains a set of blades for cutting the sealing film; wherein the crown further comprises a plurality of flaps and projections, a groove and a recess; wherein the fillets are interrupted by guides, compatible in the positioning, thickness and height with said projections, whereby the projections, inserted inside the guides, cause the crown to move in the axial direction, avoiding its rotation on its own axis when the bottle is screwed into the capsule; wherein the flaps are able to maintain the crown fixed in the crown compartment; wherein the groove, positioned at the top of the crown, interrupts the set of blades and provides a space for a small portion of said film which is not ruptured by the blades, whereby the groove enables holding the sealing film connected to said device; wherein a recess is positioned in an inner portion of the crown providing a larger space to accommodate the sealing film after its rupture, and giving freedom of movement to the film after it is cut. a crown positioned in the crown compartment; characterised in that the crown contains a set of blades for cutting the sealing film; wherein the crown further comprises a plurality of flaps and projections, a groove and a recess; wherein the fillets are interrupted by guides, compatible in the positioning, thickness and height with said projections, whereby the projections, inserted inside the guides, cause the crown to move in the axial direction, avoiding its rotation on its own axis when the bottle is screwed into the capsule; wherein the flaps are able to maintain the crown fixed in the crown compartment; wherein the groove, positioned at the top of the crown, interrupts the set of blades and provides a space for a small portion of said film which is not ruptured by the blades, whereby the groove enables holding the sealing film connected to said device; wherein a recess is positioned in an inner portion of the crown providing a larger space to accommodate the sealing film after its rupture, and giving freedom of movement to the film after it is cut.