Cap for containers

A combination of a cap and a container,

• the cap comprising an end wall, a skirt which extends about an axis, a corner zone interposed between the end wall and the skirt, the corner zone comprising a first wall portion which projects from the skirt towards the inside of the cap and a second wall portion which protrudes from the end wall and is joined to the first wall portion, the first wall portion and the second wall portion defining a step on a surface of the corner zone facing towards the outside of the cap,
• the container comprises a neck, the neck having an end portion, an outer lateral surface and
• an outer thread having an angular extension,
• wherein the cap further comprises an annular sealing lip delimited by an inner surface configured to engage with the outer lateral surface of the neck of the container, wherein the annular sealing lip extends towards a free edge of the skirt from a region in which the first wall portion is joined to the second wall portion;
• wherein the cap further comprises a plurality of outer ribs located in the corner zone,
• wherein the outer ribs are the continuation of a plurality of knurling lines provided on the skirt,
• wherein the annular sealing lip is the continuation of the second wall portion extending below a bottom edge of the second wall portion along axis (Z) towards the free edge and the annular sealing lip is positioned outside the end portion of the neck and the inner surface of the annular sealing lip is in contact with the outer lateral surface of the neck, and
• wherein the cap further comprises an inner thread having an angular extension, the inner thread of the cap engaged with the outer thread of the neck and the angular extension of the inner thread of the cap is of different length from the angular extension of the outer thread of the neck.