Apparatus for making a sheet of material comprising vegetable and/or alkaloid substances, said apparatus including: - a roller rolling mill system comprising a plurality of rollers (104a, 104b, 104c, 104d) rotatable about respective rotation axes (Ra, Rb, Rc, Rd) parallel to each other, said rollers (104a, 104b, 104c, 104d) being operatively adapted to receive said material adhering to respective working surfaces (106a, 106b, 106c, 106d), and said rollers (104a, 104b, 104c, 104d) being further arranged in succession one adjacent and substantially tangent to the other defining a rolling mill path having a rolling mill direction, wherein a rotation direction of a roller is opposite to the rotation direction of the adjacent roller, along said rolling mill path being provided between two adjacent rollers respective pressure lines (Nf, Ni, Ne) substantially adapted to press said material so as to provide the latter with a sheet-like shape, - a scraping system configured to engage by contact the working surface of a transfer roller of said plurality of rollers (104a, 104b, 104c, 104d) along a contact line (Cd) so as to detach said material having said sheet-like shape from said transfer roller, characterized in that said scraping system comprises a closed-loop endless scraping band operatively adapted to engage said working surface of said transfer roller along said contact line (Cd) by means of a scraping edge, said endless scraping band being movable at said contact line (Cd) parallel to said rotation axis (Rd) of said transfer roller by means of an actuating assembly. - a roller rolling mill system comprising a plurality of rollers (104a, 104b, 104c, 104d) rotatable about respective rotation axes (Ra, Rb, Rc, Rd) parallel to each other, said rollers (104a, 104b, 104c, 104d) being operatively adapted to receive said material adhering to respective working surfaces (106a, 106b, 106c, 106d), and said rollers (104a, 104b, 104c, 104d) being further arranged in succession one adjacent and substantially tangent to the other defining a rolling mill path having a rolling mill direction, wherein a rotation direction of a roller is opposite to the rotation direction of the adjacent roller, along said rolling mill path being provided between two adjacent rollers respective pressure lines (Nf, Ni, Ne) substantially adapted to press said material so as to provide the latter with a sheet-like shape, said rollers (104a, 104b, 104c, 104d) being operatively adapted to receive said material adhering to respective working surfaces (106a, 106b, 106c, 106d), and said rollers (104a, 104b, 104c, 104d) being further arranged in succession one adjacent and substantially tangent to the other defining a rolling mill path having a rolling mill direction, wherein a rotation direction of a roller is opposite to the rotation direction of the adjacent roller, along said rolling mill path being provided between two adjacent rollers respective pressure lines (Nf, Ni, Ne) substantially adapted to press said material so as to provide the latter with a sheet-like shape, - a scraping system configured to engage by contact the working surface of a transfer roller of said plurality of rollers (104a, 104b, 104c, 104d) along a contact line (Cd) so as to detach said material having said sheet-like shape from said transfer roller, characterized in that said scraping system comprises a closed-loop endless scraping band operatively adapted to engage said working surface of said transfer roller along said contact line (Cd) by means of a scraping edge, said endless scraping band being movable at said contact line (Cd) parallel to said rotation axis (Rd) of said transfer roller by means of an actuating assembly. said scraping system comprises a closed-loop endless scraping band operatively adapted to engage said working surface of said transfer roller along said contact line (Cd) by means of a scraping edge, said endless scraping band being movable at said contact line (Cd) parallel to said rotation axis (Rd) of said transfer roller by means of an actuating assembly.