Folding blade

A folding blade for closing flexible tubular packaging, said folding blade comprising:

• a main body which is connectable to a first axis of rotation, said main body comprising a flat plate;
• an end portion disposed on a lateral edge of the folding blade, said end portion being joined by articulation to the main body at an end opposite the first axis of rotation;
• and
• an elastic means that exerts a pulling force on said end portion, thus maintaining the end portion in an initial position in which the end portion is folded over the main body,
• wherein the main body is disposed opposite and perpendicular to a lateral portion of the flexible tubular packaging,
• wherein the first axis of rotation transmits a reciprocating rotational movement to the main body such that the main body rotates about the first axis of rotation, first in a direction towards the flexible tubular packaging, thereby pushing a portion of a lateral wall of the flexible tubular packaging to form an inward fold, and subsequently in an opposite direction, during each operational cycle,
• wherein said end portion comprises a hook which holds the flexible tubular packaging, and
• wherein, when a predetermined force is exerted on the hook by the flexible tubular packaging, the end portion rotates about a second axis of rotation along curvilinear path which is coplanar with the main body, and when said predetermined force stops, the elastic means pulls the end portion to the initial position.