Extending and separating element for packaging

An Extending and Separating Element for Packaging (E) including a base (B)

• and a cover (T), comprising:
• an intermediary disk (2);
• a first ring projection (3) arranged on a first side of the intermediary disk (2) along a peripheral region (20) of the intermediary disk (2);
• a second ring projection (4) arranged on a second side of the intermediary disk (2) along the peripheral region (20) of the intermediary disk (2), the second side is opposite to the first side;
• wherein the first ring projection (3) includes an upper portion and a lower portion, the lower portion connects to the first side of the intermediary disk (2) directly and has a thickness greater than a thickness of the upper portion, thus a step structure is formed between the upper portion and the lower portion on an inner surface of the first ring projection (3) or on an outer surface of the first ring projection (3);
• wherein the second ring projection (4) includes an upper portion and a lower portion, the lower portion connects to the first side of the intermediary disk (2) directly and has a thickness greater than a thickness of the upper portion, thus a step structure is formed between the upper portion and the lower portion on an inner surface of the second ring projection (4) or on an outer surface of the second ring projection (4);
• wherein the intermediary disk (2) has a central portion convex from the second side of the intermediary disk (2), and at least one opening is formed on the central portion of the intermediary disk (2);
• wherein the lower portion of the second ring projection (4) has an inner surface and a plurality of structural ribs (6) are formed on the inner surface of the lower portion of the second ring projection (4), and the plurality of structural ribs (6) are also directly connected to the second side of the intermediary disk (2) along the peripheral region (20).