Importance

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Abstract

A knife (100; 100′)) is arranged to be fitted to a cutting apparatus to obtain incision lines and cuts on a capsule (7) made of plastics intended to close a container and it is suitable for performing cuts and incisions on a side wall (70) of the capsule (7) when the capsule (7) by rotating around a rotation axis (R) thereof is moved along a path to interact with the knife (100; 100′) in an advancement direction (T); the knife (100; 100′) comprises a plurality of cutting tools arranged in a layered structure, wherein the cutting tools are parallel to a plane (P) and stacked in the direction of a vertical axis (Z) orthogonal to the plane (P), the layered structure comprising: —a first horizontal cutting tool (10) arranged for performing circumferential cuts on the side wall (70) at a first height on the vertical axis (Z) to define an tamper ring (72) in the capsule (7); —a second horizontal cutting tool (20), arranged for performing further circumferential cuts on the side wall (70) at a second height different from the first height on the vertical axis (Z); and —a third cutting tool (30; 30′), arranged for performing oblique cuts on the side wall (70) and to determine in use together with said second horizontal cutting tool (20) and with said first horizontal cutting tool (10) connecting portions (74a, 74b) connecting the tamper ring (72) and the side wall (70); wherein the third cutting tool (30; 30′) comprises at least two tilted cutting edges (32a, 34; 32a′, 34′) having a tilt different from each other, the tilt referring to a reference plane passing through the vertical axis (Z) and tangent to the advancement direction (T) of the capsule (7), the third cutting tool (30, 30′) being interposed between the first horizontal cutting tool (10) and the second horizontal cutting tool (20), the third cutting tool (30; 30′) being interposed between the first horizontal cutting tool (10) and the second horizontal cutting tool (20), wherein the third cutting tool (30; 30′) is arranged to be disassembled from said layered structure in order to be replaced with a different third cutting tool to obtain a different shape of the connecting portions (74a, 74b).

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First Claim