A method for processing a strip of a material of PTFE type to transform it into a strip of e-PTFE type, the method comprising the following phases: - Feeding of a strip of a material of PTFE type along a first heating section , said first heating section forming a passage path for the said strip at a predetermined temperature, the strip, during the said passage along said first heating section , being contextually subjected to a predetermined force of traction in longitudinal direction which, in combination with the said temperature, determines a longitudinal elongation thereof; - Subsequent entry of the said longitudinally elongated strip into a second heating section , said second heating section forming a passage path for the strip at a predetermined temperature, the strip, during said passage along said second heating section, being contextually subjected to a predetermined force of traction in transversal direction which in combination with the said temperature determines a variation of width thereof; - The said second heating section being positioned in succession to the first heating section downstream of the said first heating section so that the strip exiting from the first heating section automatically enters the second heating section generating a continuous processing process; - Characterized by the fact that a braking unit is provided upstream of the first heating section and a pulling unit is provided downstream of the first heating section , both adjustable so as to generate a predetermined state of longitudinal traction of the strip, the first heating section being an oven , the oven creating a passage channel such that the strip does not touch any part of the oven and then it is supported in traction by the breaking unit and the pulling unit both positioned externally to the said oven . - Feeding of a strip of a material of PTFE type along a first heating section , said first heating section forming a passage path for the said strip at a predetermined temperature, the strip, during the said passage along said first heating section , being contextually subjected to a predetermined force of traction in longitudinal direction which, in combination with the said temperature, determines a longitudinal elongation thereof; - Subsequent entry of the said longitudinally elongated strip into a second heating section , said second heating section forming a passage path for the strip at a predetermined temperature, the strip, during said passage along said second heating section, being contextually subjected to a predetermined force of traction in transversal direction which in combination with the said temperature determines a variation of width thereof; - The said second heating section being positioned in succession to the first heating section downstream of the said first heating section so that the strip exiting from the first heating section automatically enters the second heating section generating a continuous processing process; - Characterized by the fact that a braking unit is provided upstream of the first heating section and a pulling unit is provided downstream of the first heating section , both adjustable so as to generate a predetermined state of longitudinal traction of the strip, the first heating section being an oven , the oven creating a passage channel such that the strip does not touch any part of the oven and then it is supported in traction by the breaking unit and the pulling unit both positioned externally to the said oven . <EOS>