ES2848317T3 - Method and machine for wrapping paper rolls, and package obtained - Google Patents

Abstract

Pack of tissue paper rolls, comprising: - a geometrically arranged group of one or more rolls; - an enveloping sheet that laterally wraps the geometrically ordered group of one or more rolls and forms folded flaps on two substantially flat and opposite faces of the package characterized in that a respective adhesive sheet is applied to said folded flaps on each of the two faces substantially flat and opposite.

Description

DESCRIPTION

Method and machine for wrapping paper rolls, and package obtained

Field of the invention

The present invention relates to improvements in machines and in methods for producing roll packs, in particular, but not exclusively rolls of tissue paper, such as rolls of toilet paper, kitchen towels and the like. The invention also relates to improvements in the packages of the above-mentioned products.

State of the art

Tissue paper rolls, such as toilet paper, kitchen paper and the like, are normally packed in wrapping sheets of plastic material, that is, in a polymeric film. A plurality of rolls are arranged in an orderly manner to form a geometrically ordered group, with one or more rows of rolls, each of which comprises one or more stacked rolls. These ordered groups of rolls are wrapped in a wrapping sheet that surrounds the group of rolls laterally and has flaps folded against the substantially flat and opposite faces formed by the flat faces of the rolls, and welded together.

Machines for wrapping groups of rolls in wrapping sheets are described, for example, in patents US 6308497, US 7707805, US 7703264, US 2014/0260087, and in patents US 8430232, EP1067048, EP1312549, EP1992562, US8727106, US7654386, EP1228966.

The flaps of the wrapping sheet, overlapped and folded over the substantially flat faces of the group of rolls, are welded by means of a hot welding device. Some examples of welding devices are described in patents US 2004/0151481 and in EP 2213577, EP1539586.

The substantially flat and opposite faces of the packages obtained in this way have uneven surfaces due to thermal deformations of the plastic film caused by hot welding. The welded area remains exposed and, in some cases, can be damaged due to handling the packages are subjected to.

In some cases, weld defects may occur. If the welding is incomplete, the obtained package is not sealed, but may have imperfections and openings. This can happen, for example, in the case of insufficient welding temperatures. In other cases, excessive welding temperatures can lead to perforation of the plastic film, from which the wrapping sheet is produced. Typically, the wrapping sheet is printed, eg screen printed, with the manufacturer's trademarks, decorations or other technical or advertising information. Printing on the plastic film should be limited to the area of the film that is wrapped around the side surface of the package, while flaps that are folded and overlapped on the substantially flat and opposite faces of the package should generally be devoid of printing, since these areas are welded.

US2012 / 0145733 describes a package of tissue paper rolls wrapped in a welded plastic film. A handle formed of a self-adhesive sheet material is applied to the welded package. The handle is applied to the smooth side surface or along a transverse weld of the package.

Document US4119268 describes a bag of plastic material, which has two ends, respectively, a bottom and an opposite upper end. A self-adhesive handle is applied to the upper end.

Document FR809693 describes a paper package with one end closed by means of an adhesive handle. GB883408 describes a bread package with a bottom and an opposite opening, closed with a perforated sheet.

Therefore, packages of this type have some disadvantages linked to the configuration of the welding zones.

Summary of the invention

According to a first aspect, a package of rolls of tissue paper is provided, comprising a geometrically arranged group of rolls and a wrapping sheet that laterally wraps the group of geometrically arranged rolls and forms folded flaps on two substantially flat and opposite faces of the package. . Furthermore, it is envisaged that an adhesive sheet is applied to said folded flaps of at least one of the two substantially flat and opposite faces of the package.

The substantially flat surface, in practice, is formed by the flat and exposed face (s) of the roll or rolls that form the geometrically ordered group of rolls.

The geometrically arranged group of rolls can also comprise a single roll. Preferably, the geometrically arranged group of rolls comprises a plurality of rolls, arranged in two or more rows and in one or more layers.

Preferably, the folded flaps are overlapped with each other and can be welded together. In other embodiments, the adhesive sheets can be used to secure the folded flaps.

Preferably, the adhesive sheets are applied to both substantially flat and opposite faces. The adhesive sheet or each adhesive sheet advantageously covers a wide surface of the flat face, for example, at least 30%, preferably at least 50%, or at least 70%, more preferably at least 80% from the surface of the respective substantially flat face.

The adhesive sheet can be used to fix the flaps of the wrapping sheet and / or to cover the welding area of the folded and overlapped flaps, for example, for aesthetic reasons, to cover any welding defects, such as holes or areas that do not they are fully welded. Furthermore, the adhesive sheets can be printed, in order to complete the impression of the wrapping sheet, normally provided on the side surface of the package.

According to some embodiments, the package comprises a holding handle. The holding handle can be formed by an elongated element, for example, a strip of plastic film, paper, cardboard or other material, adhesively fixed between the adhesive sheet and the wrapping sheet that wraps the rolls. For example, the elongated member may have two fixed ends between the adhesive sheet and the substantially flat face of the package. In other embodiments, the handle may be formed by the adhesive sheet itself, rather than consisting of an additional and separate element, which is adhesively attached to the package by means of the adhesive sheet. For example, the handle may be formed by incisions or cuts made in a central non-adhesive area or part of the adhesive sheet. In other embodiments, the adhesive sheet may be folded to form one or two wings adhesively applied to the substantially flat face, and a raised part or two raised and folded parts, forming a handle. Clamping can be facilitated by providing openings, holes, or notches in the sheet. According to a further aspect, a method for producing a roll pack is provided, comprising the following steps:

form a geometrically ordered group of one or more rolls;

wrapping a wrapping sheet around the geometrically ordered group of rolls and folding and overlapping the flaps together said wrapping sheet on two substantially flat and opposite faces defined by the geometrically ordered group of rolls.

The method further comprises the step of applying an adhesive sheet to at least one of the substantially flat and opposite faces.

According to yet another aspect, a machine is provided for producing packages of rolls comprising: a wrapping station, configured and arranged to wrap a geometrically ordered group of rolls in a wrapping sheet, forming folded and overlapping flaps of said wrapping sheet in two substantially planar and opposite faces of said geometrically ordered group of rolls;

along an advance path of the geometrically ordered groups of rolls, downstream of the wrapping station with respect to the feed direction of the geometrically ordered groups of rolls along the advance path, a station for applying adhesive sheets to at least one of said two substantially flat and opposite faces.

Also disclosed herein is a tissue paper roll package, comprising:

- a geometrically ordered group of one or more rolls;

- a wrapping sheet that laterally wraps the geometrically ordered group of one or more rolls and forms folded flaps on two substantially flat and opposite faces of the package characterized in that an adhesive sheet that forms a handle or by means of which a handle is applied to the substantially flat face is applied to at least one of the two substantially flat and opposite faces.

Other advantageous features and embodiments of the method, of the machine and of the package are described in the present specification and in the appended claims, which form an integral part of the present description.

Brief description of the figures

The invention will be better understood with the following description and attached figures, which show practical embodiments. More specifically, in the figures:

Figure 1 illustrates a plan view of a part of the packaging line to which the machines according to the invention are added;

Figure 2 illustrates an enlargement of a head for applying the adhesive sheets to the package;

Figures 3A to 3H illustrate a sequence showing the formation of a pack according to the method described herein;

Figure 4 illustrates another embodiment of the pack;

Figures 5A to 5F illustrate other embodiments of the pack with a holding handle.

Detailed description of the embodiments

The following detailed description of the exemplary embodiments refer to the accompanying figures. The same reference numbers in different figures identify the same or similar elements. Also, the figures are not necessarily drawn to scale. Also, the following detailed description does not limit the invention. Rather, the scope of the invention is defined by the appended claims.

Reference throughout the specification to "the embodiment" or "an embodiment" or to "some embodiments" means that a particular feature, structure, or element described in relation to an embodiment is included in per at least one embodiment of the disclosed matter. Therefore, the appearance of the phrase "in one embodiment" or "in some embodiments" in various places throughout the specification does not necessarily refer to the same form (s). of realization. In addition, the functions, structures or characteristics can be combined in any suitable way in one or more embodiments.

Figure 1 schematically shows a plan view of the end portion of a production line for packets of rolls of web material, such as tissue paper. In the part of the line represented in figure 1, the reference 1 indicates the station in which the wrapping of each geometrically ordered group of rolls is carried out in a wrapping film, hereinafter referred to as the wrapping station. The wrapping station 1 may comprise a welding unit 1A that welds the folded and overlapped flaps of the wrapping sheet. The wrapping station 1 and the welding unit 1A may be configured in a known manner, for example, as described in the patents cited in the section of the present description devoted to the state of the art.

Reference 3 indicates a path of advancement of the packages obtained from station 1 towards a station 2 that may comprise a bagger of known type, in which a plurality of packages are inserted into larger bags for subsequent transport. The reference F indicates the direction of feed of the packages from station 1 to station 2.

Characteristically, downstream of the wrapping station 1, between the latter and the bagger, a station 5 is arranged for applying adhesive sheets to the substantially flat and opposite faces of the package, produced by the wrapping station 1.

In the embodiment of Figure 1, the station 5 for applying adhesive sheets comprises four working heads labeled 7A, 7B, 9A, 9B, arranged in pairs on opposite sides of the advance path 3. The four heads are substantially same and one of them is shown in the enlargement of figure 2. In the embodiment illustrated in figure 1, four heads are provided, to allow station 5 to apply the adhesive sheets to operate continuously, even during the replacement of the consumables, that is, the adhesive sheets that the station applies to the packages in transit through them. More in particular, the heads 7A, 7B, 9A, 9B are arranged so that, while the heads 9A, 9B of one pair are working, the heads 7A, 7B of the other pair can be inactive to allow the depleted coils of consumables, i.e. adhesive sheets, are removed and replaced with new spools. In other embodiments, a single pair of heads 7A, 7B, or 9A, 9B may be provided, in which case the line stops to perform the consumable change.

In some embodiments, two or more pairs of heads can be provided, and at least two pairs of heads can be used simultaneously, by operating them alternately, that is, using, for For example, a first pair for applying the adhesive sheets to the packages at the even positions and the other pair for applying adhesive sheets to the packages at the odd positions in the flow of packages from the wrapping machine 1. More generally, a head pair applies the adhesive sheets to some packages and the other head pair applies the adhesive sheets to the remaining packages. This can be useful, for example, if it is desirable to provide the packages with adhesive sheets of two different types. The concept can be extended to more than two pairs of heads and consequently to more than two different types of adhesive sheets.

In this case, to carry out the change of the consumable it is possible to provide a redundant number of pairs of heads with respect to the number of pairs that operate simultaneously. For example, three pairs of heads may be provided, two in operation and one in standby, which is loaded with the consumable and replaces the first of the two operating pairs that depletes the consumable. In this way, a total redundancy is not necessary (that is, four pairs of heads).

It would also be possible to use heads capable of making an on-the-fly change of the consumable.

Figure 2 schematically illustrates an enlargement of one of the heads 7A-9B, which are substantially the same. Reference B1 indicates a coil, on which a support band is wound; Adhesive sheets are removably fixed on the support band, which will be applied to the packages that pass through station 5 to apply the adhesive sheets. Reference B2 indicates a reel on which the spent support band is wound, that is, the support band from which the adhesive sheets have been separated and applied to the packages that pass through station 5 to apply the adhesive sheets.

In practical embodiments, heads 7A-9B are labeled as suitably sized heads.

Each head 7A-9B comprises an applicator blade 11 arranged with a free end thereof close to the substantially flat faces of the packages C advancing along the advance path 3. A support band N unwound from the coil B1 , and to which the removable adhesive sheets E are applied, is guided around the corner or distal edge of the applicator blade 11, so that, by synchronizing the advance movement of the support band N with the advance of the packages C along path 3, the adhesive sheets E are separated from the band N and transferred to the respective substantially flat face of the package C, near which the distal edge of the respective blade 11 is positioned. on each adhesive sheet E causes the adhesive sheet E to adhere to the flat face of the package. By placing two heads on the two opposite sides of the advance path 3, the adhesive sheets or labels E are applied to both the flat and the substantially opposite sides of the package C.

Contrary to what is shown in FIG. 1, in other embodiments a single pair of operating heads 7A, 7B may be provided. In this case, the replacement of consumables requires the production line to be temporarily stopped. If necessary, an accumulator of the individual packages or rolls can be provided upstream of the station 5 to apply the adhesive sheets.

While preferably two opposite adhesive sheets are applied to each package, one on each flat side, it would also be possible to apply these adhesive sheets to only one of these faces.

Adhesive sheets E are provided with a pressure sensitive adhesive. Any known pressure sensitive adhesive capable of adhering to the material from which the wrapping sheet F1 is formed can be used. In some embodiments, to improve adhesion, a pressure system, for example comprising a rubber-coated roll, indicated schematically at 12 in Figure 2, may be provided downstream of the area for the transfer of the sheet. adhesive E from carrier band N to package C. Any other pressure system, such as a sliding shoe, may be provided instead of a roll, although a roll is currently preferable, as it does not prevent the regular advancement of packets along advance path 3.

The method for producing the roll packs is illustrated in detail in the sequence of Figures 3A to 3G. These figures only show: the rolls to be packed indicated with R, the wrapping sheet with which the package is formed, and the adhesive sheets E applied at station 5 to apply the adhesive sheets. The mechanical elements of the various stations mentioned above are omitted, as they are known or described with reference to Figures 1 and 2.

Figure 3A shows an initial stage, in which a geometrically arranged group G of rolls R is wound with a wrapping sheet F1, typically a plastic film. In the illustrated embodiment, the geometrically arranged group G of rolls R has a series of 2x4 rows of rolls, where each row contains 3 rolls. It should be understood that this configuration is provided by way of example only and that the quantity and arrangement of the rolls R in the geometrically arranged group G may differ from those illustrated. The only fact that is relevant is that the geometrically ordered group G of rolls R has two substantially flat and opposite faces, defined by the flat faces of the various rolls R exposed on the two sides of the package.

Figure 3B shows the subsequent stage in which the wrapping sheet F1 has been completely wound around the lateral surface of the geometrically ordered group G of rolls R, overlapping two edges L1, L2 parallel to the axes of the rolls R. These edges can be soldiers to each other in a way known per se.

The wrapping sheet F1 has a width H greater than the height of each row of rolls R, so that two opposite parts of the wrapping sheet F1 protrude from the geometrically ordered group G of rolls R. These parts are folded to form flaps F2 that they are folded and turned against the substantially flat and opposite side faces of the geometrically ordered group G of rolls R. The folded flaps are overlapping each other, see Figures 3C, 3D and 3E.

Figure 3F shows the package C formed by the geometrically arranged group G of rolls R and the wrapping sheet F1 wound around them. Package C, not yet completed, is supplied from the wrapping machine 1 in this configuration.

The package thus produced can be passed through the welding unit 1A of the wrapping station 1. The welding unit 1A has welding elements that cause the hot welding of the folded flaps F2 that are overlapped on the two substantially flat faces and opposite of package C.

In some embodiments, the welding unit 1A can be omitted. In embodiments of the method, the welding unit can be deactivated. In the case in which the welding unit 1A is not provided, or that said unit is deactivated, it is possible to use wrapping sheets of non-thermoplastic material, such as paper, the wrapping folds are stabilized with the use of adhesive sheets E In particular, in this case the package C can be formed by a single roll R and, therefore, the geometrically arranged group consists of a single roll of paper.

If the welding unit 1a is not provided or is deactivated, between the latter and the area of application of the adhesive sheets E, that is, in the area in which the blades 11 of the heads 7A-9B are located, they can elements are provided to contain the folded and overlapped flaps F2, to prevent the flaps from being reopened. For example, feed belts may be provided which remain in contact with the substantially flat and opposite faces of the pack C. Alternatively, stationary surfaces, such as stationary plates, may be provided, preferably made of or coated with a low coefficient of material. friction, such as Teflon® or the like. In this case, the packages extend along the plates and are in contact with the same.

At station 5 for applying the adhesive sheets, two adhesive sheets E are applied to the two substantially flat opposite faces of the package C, as schematically illustrated in Figures 3G and 3H.

Figure 3H illustrates the finished package C, complete with the adhesive sheet E applied to the visible substantially flat face. A similar adhesive sheet E is applied to the opposite side (not visible in Figure 3H). The two adhesive sheets E applied to the two substantially flat and opposite faces of the package C may be the same or different. For example, they can be of a different shape or size. In some cases, one or the other of the two adhesive sheets E may be printed. In this case, the impressions on the two adhesive sheets E of the same package may be different.

Preferably, each adhesive sheet E has a surface area large enough to cover the majority of the area of the corresponding substantially flat face to which the adhesive sheet E is applied. For example, the E sheet may reach the lateral edges of said substantially flat face. The adhesive sheet E may also be edge-shaped to follow the rounded shape of the substantially flat face to which it was applied, the rounding being present at the corners and determined by the cylindrical shape of the packaged rolls.

Each adhesive sheet E is used to cover the overlap flaps F2, to protect them and prevent their wrinkled appearance from making the C pack an aesthetically unattractive impression.

The adhesive sheets E also perform the function of stabilizing the folded and overlapped flaps F2. As mentioned before, these flaps could not be thermally welded either, but they are fixed purely through the adhesive with which each adhesive sheet is provided E. In this way, a more regular package is obtained, since the formation of wrinkles is avoided. due to the thermal effect of the welding unit 1a. In addition, the power required for welding is saved.

When, on the other hand, the folded and overlapped flaps F2 are thermally welded with the welding unit 1A, the adhesive sheets E still have the function of improving the aesthetic appearance of the package C, of masking imperfections such as holes, and of protecting the flaps welded against possible damage, made the presence of folds generated by the temperature in the wrap sheet F1 more likely.

The presence of the adhesive sheets E on one and preferably on both substantially flat and opposite faces of the package C allows the latter to be provided with writing, decorations, marks or the like on all the faces, even when the welding between the folded and overlapped flaps F2 prevents the printing of the wrapping sheet F1.

In the embodiment of Figures 3A to 3H, the size H of the wrapping sheet is such that the flaps folded on the two flat faces of the package C are overlapped. This is particularly suitable in the case where the wrapping sheet is closed by welding, before applying the two adhesive sheets E to the two substantially flat opposite faces of the package. In other embodiments, the wrapping sheet F1 may have a smaller size H than that illustrated in Figures 3A to 3H. In this case, the two substantially flat and opposite faces are not completely covered by the wrapping sheet, but have a free area. An embodiment of this type is shown in figure 4. Reference Z indicates a central area of the practically flat face visible in figure 4, not covered by the wrapping sheet F1. The package C is completed by applying the two adhesive sheets E, which can advantageously have a perimeter surface provided with adhesive and a central surface without adhesive. In Figure 4, the reference C1 indicates a perimeter zone, which in practice forms a frame to which the adhesive is applied and which surrounds a zone C2 without adhesive. When the adhesive sheet E is applied to the substantially flat face of the package C, the adhered zone C1 adheres to the wrap sheet along the perimeter zone of the substantially flat face, while the zone C2 without adhesive remains in contact with the rolls R in the zone Z not covered by the wrapping sheet F1.

In this embodiment, the wrapping sheet is normally not welded, since the overlapping surface of the flaps is insufficient.

The use of a wrapping sheet F1 that has a size H smaller than the usual size (Figures 3A to 3H) allows a significant saving of consumable.

In some embodiments, the adhesive sheets E may be shaped to form a gripping handle. Figures 5A to 5F show axonometric views of packages C in which one of the adhesive sheets E forms or holds a handle indicated with the reference M in all embodiments.

In some embodiments, the adhesive sheet E is folded so as to form one or two areas adhered to the package, from which a sheet portion, separated from the package C, protrudes to form a grip. This part of the blade may have one or more openings that form a grip. In other embodiments, the handle M is formed by a strip, for example, of plastic film, the ends of which are locked between the adhesive sheet E and the corresponding substantially flat face of the package C. In still other embodiments, the The handle is formed by a groove in the adhesive sheet E. In this case, the groove can be formed in a central area of the adhesive sheet E without adhesive, between two adhered side strips.

In FIG. 5A, the adhesive sheet E has two roughly parallel cuts, which define a handle M made of the same material as the adhesive sheet E. In the area of the handle M, the adhesive sheet E may be devoid of adhesive. In Figure 5B, the adhesive sheet has a portion adhesively applied to the substantially flat face of package C and a portion without adhesive, in which openings are formed defining a grip. Also in this case, the handle is formed by the same adhesive sheet E. In Figure 5C, the handle M can be made from a die-cut sheet, to form the openings that define the grip, which can be adhered by middle of the adhesive sheet E for the package C. In Figure 5D, the adhesive sheet E has a central part folded and protruding from the package, preferably without adhesive, which forms the holding handle with gripping holes. In variants of the embodiment, the handle M can be formed by a folded sheet with two flaps that are inserted between the wrapping sheet of the package C and a double adhesive sheet E. In figure 5E, the handle M is formed by a strip of material, the ends of which are folded under the adhesive sheet E, between the latter and the substantially flat face of the package C. In Figure 5F, the adhesive sheet E has a central area, rectangular in the illustrated example, without adhesive, or with an adhesive that is less adhesive than that applied in the area surrounding the central area. The latter can be previously cut along a part of its perimeter: in the illustrated example, the central area is rectangular and is previously cut along three sides. One of the long sides of the perimeter of the central zone is formed in one piece. In this way, the central area of the adhesive sheet E can be separated along three sides and remain adhered to the perimeter area of the adhesive sheet along one of the long sides of the rectangular central area. The flap of the adhesive sheet E delimited by the central zone can be raised, as shown in the drawing, and form a handle. The grip can be formed by an incision or by a cut, for example curved, in the raised central part.

In general, the handle M can be made from the same material that forms the adhesive sheet E. For example, both the handle and the adhesive sheet can be made of paper or plastic. When the handle is formed by an element applied by means of the adhesive sheet E, but which is not an integral part of it, as in figure 5E, the adhesive sheet E and the handle can be made from different materials, for example, the adhesive sheet E can be made of paper and the handle M of plastic, or vice versa.

In general, the adhesive sheet E can have areas adhered with different adhesives, more or less adhesives, to allow the repeated opening and closing of the package C and / or repeated lifting and lowering of the handle formed by the adhesive sheet E.

Claims (15)

1. Tissue paper roll package, comprising: - a geometrically ordered group of one or more rolls; - a wrapping sheet that laterally wraps the geometrically ordered group of one or more rolls and forms folded flaps on two substantially flat and opposite faces of the package characterized in that a respective adhesive sheet is applied to said folded flaps of each of the two faces substantially flat and opposite. Package according to claim 1, in which the adhesive sheet has a surface covering at least 30%, in particular at least 50%, preferably at least 70%, more preferably at least 80%. % of the surface of the respective substantially flat face. Package according to claim 1 or 2, in which the folded flaps of the wrapping sheet are stabilized in the closed position by the respective adhesive sheet. 4. Package according to one or more of the preceding claims, in which the wrapping sheet is made of polymeric material. Package according to one or more of the preceding claims, in which the folded flaps are welded together. Package according to one or more of the preceding claims, in which the folded flaps are overlapping each other and completely cover the respective substantially flat face. Package according to one or more of claims 1 to 5, wherein the folded flaps leave a non-wrapping sheet area on the respective substantially flat face, said non-wrapping sheet area being covered by the wrapping sheet; and in which preferably the adhesive sheet has a perimeter zone provided with adhesive and a central zone without adhesive. Package according to one or more of the preceding claims, in which the package comprises a holding handle, preferably formed by the adhesive sheet or fixed to the package by means of the adhesive sheet. 9. Method for producing a roll package comprising the following steps: - form a geometrically ordered group of one or more rolls; - wrapping a wrapping sheet around the geometrically ordered group of rolls and folding the flaps of said wrapping sheet on two substantially flat and opposite faces defined by the geometrically ordered group of rolls; characterized in that it also comprises the step of applying a respective adhesive sheet to each of the two substantially flat and opposite faces. Method according to claim 9, wherein the adhesive sheet has a surface covering at least 30%, preferably at least 50%, more preferably at least 70%, even more preferably at least 80% from the surface of the respective substantially flat face. Method according to claims 9 or 10, in which the folded flaps are joined together and stabilized by means of the respective adhesive sheet. 12. Method according to one or more of claims 9 to 11, also comprising the step of welding the folded flaps together before applying the respective adhesive sheet thereto. A method according to one or more of claims 9 to 12, comprising a step of forming a handle for the package; and wherein the step of forming a handle for the package preferably comprises the step of attaching a handle to the package by means of said adhesive sheet or of shaping the adhesive sheet so as to form said handle. 14. Machine for producing roll packages, comprising: - a wrapping station, configured and arranged to wrap a geometrically ordered group of rolls in a wrapping sheet, forming folded flaps of said wrapping sheet on two faces substantially flat and opposite of said geometrically ordered group of rolls; said machine being characterized in that it comprises - along an advance path of the geometrically ordered groups of rolls, downstream of the wrapping station with respect to a feed direction of the geometrically ordered groups of rolls along the advance path, a station for applying respective adhesive sheets to each of said two substantially flat and opposite faces. Machine according to claim 14, wherein between the wrapping station and the station for applying the adhesive sheets to a welding station is arranged, configured and controlled to weld the folded flaps of the wrapping sheet together.