An embossing system, comprising an embossing frame, and an embossing cassette. The embossing cassette comprises at least 2 rollers, and a body configured to hold the at least 2 rollers, whereby the at least 2 rollers are removably mounted in the body. The embossing frame is configured to removably house the embossing cassette, and the embossing frame comprises an embossing-frame positioning means configured to cooperate with a corresponding body-positioning means of the embossing cassette at a time when the embossing cassette is housed in the embossing frame, to position the embossing cassette in a predetermined position inside of the ossing frame. The embossing system further comprises a plurality of means for adjusting and correcting a position of a rotation axis of the corresponding roller inside the body, a location of each of the means for adjusting and correcting being at one of each end of the at least 2 rollers, and the plurality of means for adjusting and correcting being configured to adjust and correct in at least two of the following: in an axial direction of the corresponding roller, n one of the 2 dimensions of a plane perpendicular to the axial direction, and the embossing frame is further configured to render the plurality of means for adjusting and correcting the position of the rotation axis inaccessible from an outside of the embossing frame at a time when the embossing cassette is housed Inside the embossing frame.

An embossing device (1) includes an embossing area in which are arranged at least: a first embossing roller (5); a second embossing roller (7;9); a first pressure roller (11) co-acting with the first embossing roller; and a second pressure roller (15) co-acting with the second embossing roller. The embossing device further includes a storage unit (51) configured for containing spare embossing rollers (55, 57, 59), for replacing one or the other of the embossing rollers (5, 7) in the embossing area. The storage unit (51) develops substantially vertically, with mutually superposed seats (53) for receiving embossing rollers (55, 57, 59, 5, 7).

A device for micro-embossing paper includes at least one micro-embossing unit to micro-emboss a wet paper ply. The micro-embossing unit includes a micro-embossing cylinder and a counter cylinder facing the micro-embossing cylinder at an embossing area where the wet paper ply is subjected to micro-embossing, and a heater to dry the wet paper ply. The micro-embossing cylinder includes a side surface partially wrapped by the wet paper ply. The heater heats at least one portion of the side surface partially wrapped by the wet paper ply to dry the wet paper ply.

An embossing group with interchangeable rollers for the surface processing of tissue paper comprises a frame (13) bearing three pairs of steel embossing rollers (17), each pair being movable between a first operative position for embossing two paper plies (11, 12) and rest positions, as well as it comprises two rubber-coated rollers (19, 20) which can be coupled with the pair of embossing rollers (17) placed in the operative position, and it further comprises two pairs of rotating supports (14, 15), wherein each one is provided with three arms (16), each one bearing at the end a locking element (18) for one end of an embossing roller (17), the rotating supports (14, 15) being constrained to the frame (13) rotating around their own central axis.

A method for producing a paper roll by conveying a first smooth ply between an upper embossing roll with first projections defining a decorative motif, and a glue distribution or cliché roll; maintaining the cliché roll side by side to the upper embossing roll, the first ply interposed between the upper embossing roll and the cliché roll and subjected to incisions and to glue deposits at the first projections on one side of the first ply facing towards the upper embossing roll and on the opposite side of the first ply facing towards the cliché roll; conveying a second ply between the upper embossing roll and a coupling or marriage roll; maintaining the marriage roll side by side to the upper embossing roll by exerting a coupling pressure to perform the final coupling between the first ply and the second ply at the glue deposits forming a multilayer paper.

A radial spacing, between two rotating cylindrical embossing tools, is adjustable, in an embossing device (14) having: an armature (19, 21); a first structure (16, 24, 26, 27, 29) which is movably mounted in translation relative to the armature (19, 21), which has a first rotating cylindrical tool (16); a second structure (17, 22, 28, 31) mounted in a fixed manner on the armature (19, 21) and which is provided with a second rotating cylindrical tool (17). A method includes steps of: pushing (T) on the first structure to move it closer to the second structure by leaning on the armature (19, 21) to adjust a radial space, or pulling (P) on the first structure (16, 24, 26, 27, 29) in order to move it away from the second structure (17, 22, 28, 31) by leaning on the armature (19, 21) in order to finely adjust the radial spacing between the first and the second tools (16, 17).

A roller arrangement for a web processing system, the roller arrangement comprising a roller and at least one rotational shaft having a shaft portion and an attachment portion and wherein the at least one rotational shaft is releasably connectable to the roller.

A method for embossing optically diffracting microstructures in a thin foil, such as used to pack at least one of the list comprising food, chocolate, chewing gum, gifts, jewellery, clothes, tobacco products, pharmaceutical products, the embossing being produced with an embossing rollers set-up comprising at least one cylindrical embossing roller and a cambered counter roller. The method comprises confining the at least one cylindrical embossing roller and the cambered counter roller in a single roller stand of relatively small outer dimensions designed to withstand a pressure for the at least one cylindrical embossing roller and the cambered counter roller; using on a surface of a first one of the at least one cylindrical embossing rollers at least one raised embossing element adapted for microstructure embossing, whereby one of the at least one raised embossing elements comprises a platform distant at a height in a range between 5 m and 30 m above a surrounding surface of the first cylindrical embossing roller adjacent to it, and a pattern engraved on top of the platform (5), whereby the pattern comprises the optically diffracting microstructures with periodicity of gratings in the range smaller than 30 gm that produce from a diffuse or directed source of light in the visible wavelength range diffraction images with high contrast and high luminosity in a defined observation angle; and adjusting the pressure for the at least one cylindrical embossing roller on the thin foil in a range less than 80 bar relative to a platform area of approximately 100 mm.sup.2.

An embossing method allowing to emboss a material on both sides comprises feeding the foil material into a roll nip between a pair of a first roll and a second roll, providing the first roll and the second roll each with a plurality of positive projections and a plurality of negative projections of identical shaped polyhedral structures, a first subset of the plurality of positive projections being disposed with a first periodicity on a first grid in axial direction and a second periodicity on the first grid in circumferential direction on the first roll, and a second subset of the plurality of negative projections being disposed with the first periodicity in axial direction and the second periodicity in circumferential direction on the first grid intertwined with the positive projections, in axial and circumferential directions respectively, and projections complementary to the first grid, on the second roll, each of the positive projections and the negative projections on the first roll during operation of the rolls and in the roll nip being surrounded on all sides by positive projections and negative projections on the second roll, the positive projections of the first roll together with alternating corresponding negative projections on the second roll forming during the operation of the rolls and in the roll nip, a first straight line substantially parallel to the axial direction, and the negative projections of the first roll together with alternating corresponding positive projections on the second roll forming during the operation of the rolls and in the roll nip, a second straight line substantially parallel to the axial direction. The positive projections and the negative projections are such that in the axial direction on the first roll each positive projection shares a lateral base border with at least one negative projection adjacent to the positive projection, and during the operation of the rolls and in the roll nip, all lateral oblique surfaces of the positive and negative projections of the first roll are just above the surface in full faced view with the corresponding lateral oblique surfaces of the respective negative and positive projections of the second roll, thereby enabling a homogeneous distribution of pressure to the material.

A tool-holder column for a unit for converting a flat substrate that has two upper bearings (14, 16) each for supporting one end of an upper rotary tool (10), and two lower bearings (15, 17) each for supporting one end of a lower rotary tool (11), the flat substrate being movable longitudinally between the upper rotary tool (10) and the lower rotary tool (11), the bearings (14, 15, 16, 17) being vertically movable in opposite directions on either side of the longitudinal direction (L) of movement of the flat substrate, and a common drive for the bearings (14, 15, 16, 17) allowing the bearings (14, 15, 16, 17) to be moved simultaneously by one and the same distance in opposite directions, and including a screw device (25), the bearings (14, 15, 16, 17) being mounted one above another on the screw device (25) such that the rotation of the screw device (25) causes the linear movement of the bearings (14, 15, 16, 17) in opposite directions.