Method, plant and structure of blade for cutting logs of paper and similar material

A method for cutting logs comprising the steps of:

• prearranging at least one cutting region configured to be crossed by at least one log according to a conveying direction transversal to a cutting plane;
• prearranging a blade having a longitudinal axis and comprising:
• a plane cutting portion and a connection portion connected to said cutting portion;
• and
• said cutting portion having a cross section of minimum width, a cross section of maximum width and at least one cutting profile that extends obliquely between said cross section of minimum width, and said cross section of maximum width so that said cutting profile forms an angle with respect to said longitudinal axis set between 1° and 60°, in particular between 1° and 30°, much more in particular, between 1° and 10°, preferably between 1° and 8°,
• said cutting profile having a cutting height in a direction that is orthogonal to said longitudinal axis equal to at least the difference between said cross section of maximum width and said cross section of minimum width, and said connection portion having width less than or equal to said minimum width
• moving said blade parallel to said longitudinal axis so that said connection portion and said cutting portion cross in turn said cutting region and said cutting portion passes through said cutting region according to said cutting plane;
• and
• conveying said or each logs on a respective cutting cradle in said cutting region, said or each logs having a height less than said cutting height so that said cutting profile that extends obliquely cuts said logs during said movement starting from a point in which it comes in contact with said log, causing a cut in said logs and obtaining cut portions having a same length as a predetermined conveying length.