Packaging machine

Abstract

A machine for packaging paper rolls (R) comprises gluing means (EG) adapted to apply a gluing substance (GG) on the inner side of the side flaps of a packaging sheet, acting when the roll (R) passes through an entry station (E) of the machine.

Description

Technical Field

[0001] The present invention relates to a machine for packaging products, such as paper rolls—e.g., toilet paper rolls or absorbent paper rolls—using paper-based packaging sheets or wrapping sheets that wrap rolls previously grouped and sorted into pre-formed packaging configurations. Background Technology

[0002] It is known that packaging paper rolls with packaging sheets, typically made of plastic film, requires the use of a machine commonly referred to as a packaging machine. This machine is equipped with an inlet station for rolls arranged in a predetermined grouping sequence, wherein one or more rows of rolls are arranged side-by-side to form one or more stacked rolls. The rolls are introduced into the inlet station by means of a lift, on which the group of rolls to be packaged is pre-formed. Before the rolls are introduced into the packaging machine, the packaging sheet is placed on the rolls arranged on the lift. In the subsequent step as the rolls pass through the aforementioned inlet station, the packaging sheet undergoes a first fold, thereby wrapping the roll upwards and laterally. Then, through two movable horizontal surfaces commonly referred to as a folder and a reverse folder, the vertically projecting edges of the packaging sheet are folded at the sides of the package, thereby wrapping the roll at the bottom as well. A sealing unit is configured to heat-seal the edges of the sheet located in the lower portion of the package. Inside the packaging machine, the paper roll moves along a generally straight path extending between the aforementioned inlet station and the outlet station for the completed packages. Processing of the packages being formed is carried out by a conveyor commonly referred to as an "upper drive," which is specifically configured to form multiple compartments in which the individual packages to be completed are received. Within the packaging machine, the edges of the packaging sheet are further folded. For this purpose, the packaging machine is equipped with a folding unit that acts on the head of the package to be completed to form a so-called "head" fold oriented in the direction of the movement applied by the upper drive.

[0003] Examples of packaging machines that typically operate according to the above scheme are provided in WO2021 / 009339A1 and WO2021 / 009340A1. Summary of the Invention

[0004] The present invention relates to packaging products of the above type using packaging machines that use packaging sheets made of paper material, which by their nature cannot be used in machines that are conventionally fed with packaging materials made of plastic film.

[0005] The main objective of this invention is to provide a packaging machine configured to package paper rolls, such as toilet paper rolls or absorbent paper rolls, using paper material for manufacturing individual packages.

[0006] Because of this invention, packages with packaging sheets made of paper material can be formed without introducing substantial modifications to the processes commonly used in this field. Another advantage is that this invention can be easily implemented in current packaging machines without introducing specific structural or mechanical complexities. Attached Figure Description

[0007] These and other advantages and features of the invention will become more apparent to those skilled in the art from the following description and accompanying drawings, which are provided by way of example but not to be considered limiting, in which: - Figure 1A A schematic side view of the main body of the packaging machine according to the present invention is shown; - Figure 1B A schematic top view of a packaging machine according to the present invention is shown; - Figure 2 yes Figure 1A Magnified details; - Figure 3 yes Figure 1A A schematic horizontal cross-sectional view of the unit shown; - Figure 4 yes Figure 3 Magnified details; - Figures 5 to 7 The different stages of the process of forming the closed plate-like part of the head are schematically illustrated; - Figure 8 This is a schematic three-dimensional view of the glue dispensing mechanism used in the entry station for products to be packaged; - Figure 9 This is a front view of the upper surface of the product loading hopper; - Figure 10 This is another view of the upper surface of the product loading hopper; - Figures 11 to 17 The folding steps of the side sheet of the packaging material below the product are schematically shown; - Figure 18 A to Figure 18 G is Figures 11 to 17 Another illustration of the various stages shown in the diagram; - Figure 19 yes Figure 18 A schematic perspective view of the stage shown in D; - Figure 20 yes Figure 18A schematic perspective view of the stage shown in E; - Figure 21 yes Figure 18 A schematic perspective view of the stage shown in F; - Figure 22 This is a simplified block diagram relating to possible methods of feeding adhesive dispensers (GN); - Figure 23 This is a simplified block diagram relating to the possible modes of feeding the suction nozzle (SN); - Figure 24 A connecting unit with a movable pressure bar is schematically shown. Detailed Implementation

[0008] Simplified to the basic structure of the packaging machine PM according to the invention and referring to an example of an embodiment shown in the accompanying drawings, the packaging machine PM according to the invention is of the type comprising a machine body MB having an inlet station E for arranging products, particularly paper rolls R, according to a predetermined grouping sequence, wherein one or more rows of rolls are arranged side by side to form one or more stacked rolls. Figure 1A In the attached diagram, the reference numeral "MS" indicates the fixed frame that supports the following operating components of the machine. The machine PM also includes an exit station U for finished product packaging and a sliding surface Z located within the machine body MB between the entry station E and the exit station U, along which the package being formed is moved. The machine body MB is the unit in which roll R is packaged with material.

[0009] Roll R is introduced into the entry station via elevator EL, on which the rolls to be packaged are pre-formed. Roll R is fed along conveyor CN, as... Figure 1B The diagram schematically shows conveyor CN transferring roll R to elevator EL. Figure 1B The arrow "FC" indicates the direction followed by roll R on conveyor CN. Figure 1B In the example shown, the conveyor is oriented orthogonally to the main body MB of the packaging machine.

[0010] The elevator EL is defined laterally by the hopper T, which includes two lower vertical walls LL and LR. Above the two lower vertical walls LL and LR, there are two corresponding upper vertical walls UL and UR, so that there is a space H of a predetermined height between the lower and upper walls of the loading hopper, which allows the packaging sheet SH to pass through.

[0011] According to the operating procedures known to those skilled in the art, when the elevator EL lifts the roll R through station E, as schematically indicated by arrow "EU", the packaging sheet SH is dragged upward by the roll R itself, and due to the arrangement of the vertical walls UL and UR, the packaging sheet SH wraps around the roll itself on the upper side and laterally, thereby forming side flaps LD and LS and an upper flap LX. At this stage, two blades B of the drive unit UC, which forms a compartment, are positioned above station E, and the roll R, the upper flap LX of the packaging sheet SH, and the side flaps LS and LD are inserted into the compartment. At the end of this stage, the side flaps of the packaging sheet protrude below the roll R. Typically, in the previous stage, the sheet SH is positioned such that one of the side flaps (the left flap "LS" in the figure) is longer than the other side flap (the right flap "LD" in the figure). At this time, station E is closed, causing the folder F to move in direction P and the reverse folder CF to move in the opposite direction. In this manner, the protruding edge of the packaging sheet is folded below roll R, that is, the lower part of the packaging sheet is folded, and the unfinished package is translated toward the exit U. Simultaneously, when the elevator returns to its starting height to receive other rolls for packaging, the edges of the packaging sheet previously folded below roll R are joined. This joining is performed as described below.

[0012] Before the roll is introduced into station E, the packaging sheet SH is placed on the roll arranged on the elevator.

[0013] In the subsequent steps after passing through the aforementioned entry station, the packaging sheet SH undergoes its first fold, thus wrapping the roll upwards and laterally. Then, the moving horizontal surfaces F and CF, constituting the folder and reverse folder, determine the folding of the sheet portions LD and LS that project vertically onto the sides of the package, such that the sheet still wraps the roll at the bottom. In practice, after the roll is lifted by the elevator, the folder F and reverse folder CF move to intercept the sheet portions LD and LS respectively, thereby folding the sheet portions LD and LS under the roll to be packaged. At this stage, the elevator EL descends, as schematically indicated by arrow "ED". Figure 13The diagram illustrates the downward folding of the upper sheet portion LX, and the right and left sheet portions LD and LS of the packaging sheet during the ascending phase, i.e., the transport phase as the roll passes through the entry station E. Since the sheet SH is typically positioned asymmetrically relative to the elevator EL—that is, the sheet SH is not perfectly centered relative to the elevator EL—one side of the sheet is usually longer than the other side at the end of the ascending phase. In the illustrated example, the left sheet portion LS is longer than the right sheet portion LD. Generally, the longer side sheet portion will be the one acted upon by the reverse folding device CF. During the folding operation of the corresponding sheet portion LD of the packaging sheet SH, the folding device F moves in a direction consistent with the direction P followed by the roll in the body of the packaging machine. Conversely, during the folding operation of the corresponding sheet portion LS of the packaging sheet SH, the reverse folding device CF moves in a direction opposite to said direction P.

[0014] The formation of the lower sheet portion of the packaging sheet is determined by the combined action of the folder F and the reversible folder CF. (Refer to the attached diagram.) Figures 11 to 17 In the example shown, in the first stage, the roll R to be packaged, fed by conveyor CN, is positioned on elevator EL located in the waiting roll position. Figure 11 In the second stage, the packaging sheet SH is positioned through the aforementioned space H, and the elevator EL is lifted, thereby causing the roll R to intercept the sheet SH. Figure 12 In the third stage, as the elevator EL continues to rise, the roll R is positioned in the compartment of the upper drive unit UC, and the right sheet portion LD and the left sheet portion LS are formed when the sheet portion LX covers the upper part of the roll. Figure 13 and Figure 14 In the subsequent stage, the folder F moves toward the reverse folder CF, as indicated by arrow "MF," thereby intercepting the right sheet portion LD of the packaging sheet and folding it under the roll R. Figure 15 Subsequently, the reverse folder CF moves toward the folder F, as indicated by arrow "CMF," thereby intercepting the left sheet portion L with S and folding the sheet portion below the roll R and below another sheet portion. Figure 16 and Figure 17 The movement of the reverse folder CF is synchronized with the movement of the assembly formed by the roll and packaging sheet along the aforementioned direction P. This process is identical to that occurring in conventional packaging machines, where the packaging sheet is made of a film of plastic material.

[0015] Then, the joining unit joins the sheet-like portions LD and LS of the packaging sheet to the bottom of the package. The execution of the joining is described below.

[0016] Inside the packaging machine PM, rolls to be packaged move along a generally straight path (identified by the aforementioned direction P) by means of a conveyor or an "upper drive UC" that extends between an inlet station (E) and an outlet station (U) for the finished package. The upper drive UC includes multiple trays B configured to form multiple compartments in which the individual packages to be finished are received.

[0017] Inside the packaging machine, further folding of the edges of the packaging sheet is carried out by means of a folding unit FG, which acts on the heads on both sides of the package to be completed to form a so-called "head" fold on the edges of the packaging sheet. In fact, the edges of the packaging sheet correspond to the heads.

[0018] The folding unit (FG) includes a plurality of movable side folders EP that move along two horizontal loops CR and CL. Each of the plurality of movable side folders EP has a forward portion oriented according to the direction P followed by the package within the machine and a return portion along which the movable side folder moves in the opposite direction to the forward portion.

[0019] The loops CR and CL are located on opposite sides of the centerline of machine PM and extend through the entry station E.

[0020] The movable side folder EP includes a body having a surface for contacting the packaging sheet. For example, the movable folder EP can be formed as a brush-like element constrained to a corresponding carriage CC, which guides the movable folder EP along the paths CR, CL shown in the figures.

[0021] The movable side folder EP defines the formation of a first side fold PS on each head. The first side fold PS includes a portion of the side sheet portion (left sheet portion in the figure) and a portion of the upper sheet portion (LX) of the sheet SH, and the first side fold is pressed against the roll R.

[0022] A fixed lateral reversing folder SF and a folding spiral FH are provided downstream of the circuits CR and CL relative to direction P.

[0023] The fixed lateral reverse folder SF includes two vertical surfaces positioned on either side of the path followed by the formed package.

[0024] A fixed lateral reverse folder SF defines the formation of a second side fold PD on each head of the forming package, the second side fold PD comprising a portion of the other side sheet (the right sheet in the figure). A nozzle (not visible in the figure) blows compressed air onto the upper area of ​​the package, thereby forming an upper fold UP.

[0025] The aforementioned side folding portion does not include the lower portion of the sheet SH. After folding by the folder F and the reverse folder CF, and after folding by the movable side folder EP and the fixed lateral reverse folder SF, this lower portion still has two sheet-like portions LF and LR, which protrude downwards, are in a generally horizontal position, and extend beyond the head of the formed package. The folding spiral FH is formed by two spiral surfaces, which are also located on opposite sides relative to the machine PM centerline.

[0026] The folding spiral FH defines the lifting of the protruding sheet portions LF and LR on each head of the forming package and the positioning of the protruding sheet portions LF and LR on the side fold portions PD and PS, thereby forming two head closed sheet portions PH, one closed sheet portion per head, which are superimposed on other sheet portions.

[0027] The packaging sheet SH is unwound from a roll supported by an unwinding machine located at a predetermined point on the machine and associated with a cutting mechanism for the material being unwound from the roll. This cutting mechanism produces sheets of paper material of predetermined lengths according to the specifications of the package. The unwinding machine and cutting mechanism are the same as those commonly used in conventional packaging machines for feeding and cutting packaging sheets of plastic materials, and therefore will not be described in further detail. In the accompanying drawings, the roll is only... Figure 1B The figure shows the unwinding machine and is marked by the reference numeral "WH". In the same figure, the reference numeral "UW" indicates the unwinding machine, which is located on the opposite side of the conveyor (CN) relative to the main body MB.

[0028] According to the present invention, the joining of the sheet portions LD and LS in the lower portion of the package is achieved using an adhesive device arranged and acting at the roll entry station E and used to apply a predetermined amount of adhesive to a predetermined area of ​​the side sheet portion of the packaging sheet SH.

[0029] Preferably, according to the invention, the joining occurs during the formation of the lower sheet portion LS formed by the reverse folder CF. Furthermore, preferably, the vertical position of the sheet portion is checked before bonding the side sheet portions of the packaging sheet. In the non-limiting example shown in the figures, the bonded side sheet portion of the sheet SH is the right-side fold portion LD folded by the folder F.

[0030] For example, the adhesive device consists of a series of dispensing nozzles GN located outside the upper wall UR of the loading hopper T, that is, the dispensing nozzles GN are located outside the wall UR of the hopper T and below the folder F. The wall UR is provided with an orifice HR through which the adhesive dispensed by the nozzles GN can flow.

[0031] For example, the dispensing nozzles GN are horizontally aligned along the wall UR. Preferably, the dispensing nozzles GN are equidistant from each other. Alternatively, the dispensing nozzles GN may be arranged in non-equidistant positions.

[0032] Furthermore, preferably, each of the dispensing nozzles GN is positioned in the lower portion of a corresponding vertical groove VN formed on the inner side of the wall UR—that is, on the side of the wall facing the opposite wall UL.

[0033] For example, a dispensing nozzle GN may include a nozzle that delivers liquid adhesive contained in a suitable can GT. The can GT is only used in... Figure 22 The illustration shows that the reference numeral "NT" indicates multiple connecting tubes between the can GT and the dispensing nozzle GN. The adhesive can be a cold adhesive or a hot adhesive; that is, an adhesive that does not require reaching a minimum activation temperature, or an adhesive that requires reaching a minimum temperature to perform its adhesive activity. Further information regarding the bonding stages of actuating the sheet portions LD and LS via adhesive bonding is provided below.

[0034] Preferably, the device for controlling the position of the adhesive-applied sheet portion LD of the sheet SH is a pneumatic suction device, which is arranged and acts on the same wall UR through which the adhesive application device passes. For example, the pneumatic suction device includes a plurality of suction nozzles SN, which are arranged on the side of the adhesive application device and controlled by corresponding pneumatic suction devices AS. The pneumatic suction device AS is only used in… Figure 23 The illustration shows that, in the figure, reference numeral "AN" indicates a plurality of pipes connecting the suction device AS to the suction nozzle SN. Preferably, the suction nozzle SN is arranged between and on the side of the adhesive dispensing nozzle, and functions through a hole formed on the wall UR and located laterally to the hole HR through which the adhesive dispensing nozzle passes.

[0035] Preferably, when roll R is lifted by elevator EL, i.e., during the stage of forming the side sheet portions LD and LS of packaging sheet SH, suction device SM is activated to adhere the sheet portion (in the example shown in the figures, this sheet portion is sheet portion "LD") to the wall UR acted upon by dispensing nozzle GN. During this stage, dispensing nozzle GN is activated so that the adhesive G dispensed by the dispensing nozzle is distributed on the outer side of sheet portion LD. Grooves VN in wall UR prevent adhesive G from spreading on the wall, thus keeping it clean.

[0036] A lever BS, used as a presser, can be mounted on a reverse folder CF. More specifically, according to the example shown in the attached figures, the lever BS is positioned to correspond to the lateral opening TS of the reverse folder CF and is connected to an actuator AB that controls the raising and lowering of the lever BS through the opening TS. During the operation phase of folding the sheet portion LS via the reverse folder CF, the lever BS is lowered so as not to affect the folding operation. At the end of the operation phase of folding the sheet portion LS via the reverse folder CF, the lever BS is raised to press the sheet portion LS against the sheet portion LD that has received the adhesive. In this way, the aforementioned engagement of the sheet portion LD and the sheet portion LS under the roll R is achieved. The lever BS, together with the actuator AB, forms the aforementioned engagement unit. The actuator AB is schematically located in... Figure 24 As shown in, Figure 24 In the diagram, the lowering position of lever BS is represented by a solid line, while the rising position is represented by a dashed line.

[0037] In fact, the bar BS is a presser mounted on the reverse folder CF. The bar BS is constructed and controlled to press the sheet portion LS onto the adhesive-coated sheet portion LD.

[0038] The rod BS can optionally be a heating rod adapted to apply heat under the roll R during the aforementioned bonding of the sheet portions LD and LS. This allows the use of an adhesive that can be activated by applying heat.

[0039] Preferably, the folder F has a series of longitudinal grooves GF formed along a line that ideally intersects with the vertical groove VN formed in the wall UR, such that when the folder F is moved to fold the sheet portion LD that has received the adhesive G, the adhesive G does not come into contact with the folder F.

[0040] Furthermore, advantageously, according to the invention, the packaging machine PM also includes an additional sizing device arranged between the side folding unit FG and the folding auger FH. This additional sizing device is also adapted to dispense adhesive GG onto the inner (upward-facing) sides of the aforementioned protruding sheet portions LF and LR. For example, the additional sizing device includes two dispensers EG arranged in pre-formed opposite positions relative to the centerline of the machine PM, i.e., arranged in pre-formed opposite positions along the path followed by the package formed within the machine. The adhesive GG provided by the additional sizing device EG allows the head-closed sheet portion PH to be glued onto the side sheet portions PD and PS. Figure 4 As shown, the dispenser EG can be arranged such that a glue line is formed on each sheet portion LF, LR, and this glue line is oriented parallel to the forward direction P of the package formed along the plane Z of the machine. Figure 4 In this context, the glued line is represented graphically as a series of points.

[0041] It should be understood that the number of dispensers EG can be greater than the number shown in the example in the figures, depending on the size of the packaging sheet, i.e., the size of the package to be manufactured.

[0042] Downstream of the folding auger FH, the compression unit UC of the head-closed sheet portion PH is preferably arranged to facilitate bonding the head-closed sheet portion PH to the side sheets PD, PS. For example, the compression unit UC is formed by a compression channel CO extending along the direction of movement P of the package and arranged upstream of the outlet portion U. For example, the compression channel CO is defined on both sides by two corresponding motorized belts NC, which have a forward portion according to the direction P followed by the package and a return portion moving in the opposite direction. Figure 3 In the example shown, the belt NC is guided on a series of rollers RC that define two closed paths on either side of the compression channel CO, wherein pulleys PC are subject to corresponding rotary actuators that control the movement of the belt NC along their respective paths. Figure 3 The arrow "C" indicates the direction of the NC band in the compression channel CO. If necessary, the motorized NC band can be heated to further facilitate the bonding of the head-sealing sheet PH to the side sheet portions PD and PS, especially when the adhesive dispensed by the dispenser G is an activatable hot adhesive, i.e., a hot adhesive that is activated by applying heat.

[0043] The blades B of the upper drive unit UC push the package along the path P until it reaches the compression channel CO, where the package is taken over by the motorized belt NC.

[0044] The above procedure also applies to packaging individual rolls with paper-based packaging sheets.

[0045] Therefore, the packaging machine according to the present invention is a machine that includes: - A packaging unit MB having an entry station E and a device EL for arranging one or more paper rolls R into a configuration suitable for packaging the paper rolls R with a paper material packaging sheet SH to achieve a package configuration, the package including an upper side LX, a lower side formed by joining two side sheet-like portions of the packaging sheet folded under the roll, side folded portions PD, PS located on each head, a first head sheet-like portion UP, and a head closing sheet-like portion PH, the head closing sheet-like portion PH being formed by sheet-like portions that are stacked and joined to the other sheet-like portions PD, PS, UP; - Devices UW and WH for feeding the paper packaging sheet SH to the entry station E; - Folding devices F and CF, which are adapted to fold the two side sheet portions LD and LS of the packaging sheet SH under the roll; - A joining device for joining the sheet portions LD and LS to each other below the roll; - A control device UC, which is used to move the forming package within the machine along a predetermined direction P; - Devices FG and SF, said devices FG and SF being configured to: form two side folds PD and PS on each of the two heads of each package as the package moves along said direction P; - Device FH, configured to form a head-closing sheet PH on each head of the package; Furthermore, the packaging machine PM also includes: - A first adhesive device GN, adapted to apply adhesive material G to the outer side LD of the packaging sheet SH, the first adhesive device GN being arranged upstream of the folding devices F and CF and acting upstream of the folding devices F and CF, such that the side is made to have adhesive before the outer side LD is folded under the roll R. - A second adhesive device EG, adapted to apply adhesive material GG to the inner sides of the side folds PD and PS, is arranged downstream of and operates downstream of the first adhesive device relative to the direction P, and is arranged upstream of the device for forming the head closure sheet. A first adhesive device GN is arranged in the entry station E and acts on a side of the hopper T for loading the roll R, such that the side sheet portion LD is adhesively bonded as the roll R passes through the entry station E.

[0046] Furthermore, preferably, according to the example disclosed above, the first adhesive device GN includes a series of nozzles adapted to dispense adhesive through holes HR formed in the wall of the hopper T.

[0047] Furthermore, preferably, the first adhesive device GN is configured to apply the adhesive material to the outer side of the side sheet portion PD when the side sheet portion PD is in a vertical position and adheres to the vertical wall of the hopper T. Therefore, preferably, the packaging machine according to the invention includes a device SN adapted to pneumatically draw the sheet side portion toward the side wall of the hopper T in such a way that the first adhesive device is also arranged and acts in the side wall of the hopper T.

[0048] Furthermore, preferably, the packaging machine according to the invention may have one or more of the following features, and these features may also be combined with each other: - The first adhesive device GN includes a series of nozzles adapted to dispense adhesive and arranged outside the upper wall UR of the loading hopper T, the wall UR being provided with orifices HR, through which the nozzles GN act.

[0049] - The nozzle GN is aligned along a predetermined direction parallel to the wall UR.

[0050] - Each of the nozzles GN is positioned in the lower portion of a corresponding vertical groove VN formed on the inner side of the wall UR.

[0051] - The device for controlling the posture of the side sheet portion LD of the sheet SH being bonded is a pneumatic suction device arranged and acting on the same wall UR of the machine as the first bonding device.

[0052] - The folding device for folding the side sheet portions LD, LS of the packaging sheet under the roll includes a reverse folder CF with a rod BS mounted on it, the rod BS acting as a presser during the engagement phase of the side sheet portions LD, LS of the sheet.

[0053] - The rod BS can be a heatable rod.

[0054] - The device for folding the side sheet portions LD, LS of the packaging sheet under the roll includes a folder F having a series of longitudinal grooves GF.

[0055] - The second adhesive device includes a plurality of dispensers EG arranged in a pre-formed opposite position relative to the centerline of the machine PM, i.e., along the path followed by the package being formed within the machine.

[0056] - A compression unit UC for the head sealing sheet PH is provided downstream of the device used to form the head sealing sheet.

[0057] - The compression unit UC is formed by the compression channel CO, the compression unit UC extends along the direction P of the movement of the package and is arranged upstream of the outlet portion U of the machine.

[0058] - The compression channel CO is defined on both sides by two corresponding motorized webs NC, each web having a forward portion that moves along the direction P followed by the package and a return portion that moves in the opposite direction.

[0059] - If necessary, the motorized web NC is heated to further promote the bonding of the head-closure sheet portion PH to the other sheet portions PD, PS, UP.

[0060] The upper drive UC, folding unit FG, horizontal folder F, horizontally movable reverse folder CF, vertically fixed reverse folder SF, and screw FH operate in a known manner.

[0061] In fact, the details of implementation may vary in any case with respect to the various elements described and shown in an equivalent manner, and thus will not depart from the scope of the solution idea adopted, and therefore remain within the scope of protection provided by this patent under the appended claims.

Claims

1. A packaging machine, said packaging machine (PM) comprising: A packaging unit (MB) having an entry station (E) and an elevator (EL) for arranging one or more paper rolls (R) into a configuration suitable for packaging the paper rolls (R) with a paper material packaging sheet (SH) to achieve a package configuration, the package including an upper side (LX), a lower side formed by joining two side sheet portions of the packaging sheet folded under the paper roll, side fold portions (PD, PS) located on each head, a first head sheet portion (UP) and a head closing sheet portion (PH), the head closing sheet portion (PH) being formed by sheet portions that overlap and join the side fold portions (PD, PS) and the first head sheet portion (UP); - A feeding device (UW, WH) for feeding the packaging sheet (SH) of paper material to the entry station (E); - Folding device (F, CF), the folding device (F, CF) being adapted to fold the two side sheet portions (LD, LS) of the packaging sheet (SH) under the paper roll; - A joining device for joining the side sheet portions (LD, LS) to each other below the paper roll; - A control device (UC) for moving the package being formed within the packaging machine along a predetermined direction (P); - Folding units (FG, SF), the folding units (FG, SF) being configured to: form two side folds (PD, PS) on each of the two heads of each package as the package moves along the predetermined direction (P). - Folding screw (FH), the folding screw (FH) being configured to form a head-closing sheet (PH) on each head of the package. The packaging machine (PM) is characterized in that it further includes: - A first adhesive device (GN) adapted to apply adhesive material (G) to the side sheet portion of the packaging sheet (SH), the first adhesive device (GN) being arranged upstream of the folding device (F, CF) and acting upstream of the folding device (F, CF) to make the side sheet portion have adhesive before folding the side sheet portion under the paper roll (R); - A second adhesive device (EG), adapted to apply adhesive material (GG) to the inner side of the side folds (PD, PS), the second adhesive device (EG) being arranged downstream of and acting downstream of the first adhesive device and arranged upstream of the folded spiral (FH) for forming the head closure sheet (PH), with respect to the predetermined direction (P). - And wherein the first adhesive device (GN) is arranged in the entry station (E) and acts on a side of a hopper (T) for loading the paper roll (R) such that the side sheet is adhesively bonded as the paper roll (R) passes through the entry station (E).

2. The packaging machine according to claim 1, characterized in that, The first adhesive device (GN) includes a series of nozzles adapted to dispense adhesive through holes (HR) formed in the wall of the hopper (T).

3. The packaging machine according to claim 1, characterized in that, The first adhesive device (GN) is configured to apply the adhesive material to the side sheet portion of the packaging sheet, the side sheet portion of the packaging sheet being arranged in a vertical position and adhering to the vertical wall of the hopper (T).

4. The packaging machine according to claim 2, characterized in that, The packaging machine includes a suction nozzle (SN) adapted to pneumatically draw the side sheet portion toward the side wall of the hopper (T): the first adhesive device is also arranged and acts on the side wall of the hopper (T).

5. The packaging machine according to claim 1, characterized in that, The first adhesive device includes a series of nozzles (GN) adapted to dispense adhesive (G).

6. The packaging machine according to claim 1, characterized in that, The first bonding device includes a series of nozzles (GN) adapted to dispense adhesive (G) and arranged outside the upper wall (UR) of the hopper (T), the wall (UR) being provided with holes (HR), through which the nozzles (GN) act.

7. The packaging machine according to claim 6, characterized in that, The nozzle (GN) is aligned along a predetermined direction parallel to the upper wall (UR).

8. The packaging machine according to claim 7, characterized in that, Each nozzle (GN) is positioned in the lower portion of a corresponding vertical groove (VN) formed on the inner side of the upper wall (UR).

9. The packaging machine according to claim 1, characterized in that, The packaging machine includes a control device for controlling the posture of the side sheet portion of the packaging sheet (SH) being bonded, the control device being a pneumatic suction device arranged and acting on the same upper wall (UR) of the packaging machine that is acted upon by the first bonding device.

10. The packaging machine according to claim 1, characterized in that, The folding device for folding the side sheet portions (LD, LS) of the packaging sheet under the paper roll includes a reverse folder with a rod (BS) mounted on it, the rod (BS) acting as a presser during the engagement phase of the side sheet portions (LD, LS) of the packaging sheet.

11. The packaging machine according to claim 10, characterized in that, The rod (BS) is a heatable rod.

12. The packaging machine according to claim 1, characterized in that, The folding device for folding the side sheet portions (LD, LS) of the packaging sheet under the paper roll includes a folder having a series of longitudinal grooves (GF).

13. The packaging machine according to claim 1, characterized in that, The second bonding device includes a plurality of dispensers arranged in a pre-formed opposite position relative to the centerline of the packaging machine (PM), i.e., along the path followed by the package being formed within the packaging machine.

14. The packaging machine according to claim 1, characterized in that, Downstream of the folded spiral (FH) used to form the head closure sheet, a compression unit for the head closure sheet (PH) is provided.

15. The packaging machine according to claim 14, characterized in that, The compression unit is formed by a compression channel (CO) that extends along the predetermined direction (P) of the movement of the package and is arranged upstream of the outlet portion (U) of the packaging machine.

16. The packaging machine according to claim 15, characterized in that, The compression channel (CO) is defined on both sides by two corresponding motorized webs (NC), each motorized web having a forward portion that moves along the predetermined direction (P) followed by the package and a return portion that moves in the opposite direction.

17. The packaging machine according to claim 16, characterized in that, The motorized web (NC) is heated.

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