JP2022116159A - Method and machine for forming pieces of multi-layered cylindrical tubular rods used to form substantially cylindrical smoker articles, and pieces formed by the method and machine - Google Patents

Abstract

A method and apparatus for forming pieces of multi-layered cylindrical tubular rods suitable for forming generally cylindrical smoker articles. A machine (100) for forming a piece of multi-layered cylindrical tubular rod (1) suitable for forming a substantially cylindrical smoker article comprises first means (101) for supplying at least a first continuous web (102); second means 103 for feeding a second continuous web 104; means 107 for forming a continuous multilayer web M by overlapping at least the first and second layers; means 110 for forming a rod 1 around the feed direction X and means 111 for cutting the rod 1 into pieces. Machine 100 is configured to position at least one lateral edge of the first and second layers to form at least one end seam. [Selection drawing] Fig. 7

Description

The present invention relates to a method and machine for forming pieces of multi-layered cylindrical tubular rods suitable for forming generally cylindrical smoker articles.

The invention also relates to pieces of multi-layered cylindrical tubular rods suitable for forming generally cylindrical smoker articles.

A multilayer web comprising strips suitable for imparting desired properties, as described in International Patent Application Publication No. WO 2014/188318, comprising:
Machines used to form smoker articles are known in the prior art in which a cylindrical member of any kind of smoker article is wound. The strips are made, for example, of metal or plastic material. The machine described in WO2014/188318 is suitable for directly forming pieces of smoker's articles by wrapping a multilayer web around a cylindrical member.

Machines or methods currently available for providing pieces of multi-layered cylindrical tubular rods suitable for subsequent axial filling of cylindrical members required to form smoker articles. no. In practice, in this case, it would be necessary to provide a piece of multi-layer cylindrical tubular rod which meets tight dimensional and shape tolerances, particularly with respect to the inner diameter that must receive the aforementioned member.

Currently, prior art machines and methods are unable to position and/or position the individual layers of a multi-layer web.
Alternatively, the specified tolerances cannot be met because the alignment is prone to errors and phase shifts between processing stations, for example due to tension fluctuations in continuous web feeding.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a method and apparatus for forming pieces of multi-layered cylindrical tubular rods that overcome the above-described drawbacks of the prior art.

More specifically, it is an object of the present invention to provide a method and machine for forming a multi-layer cylindrical tubular rod piece capable of providing a multi-layer cylindrical tubular rod piece meeting tight dimensional and shape tolerances, particularly with respect to the inner diameter. to provide.

Another object of the present invention is to form a reliable product which can be adapted to form different types of products and in particular guarantees complete circumferential closure and precise circumferential and longitudinal positioning of the different layers. It is an object of the present invention to provide a method and machine for forming pieces of multi-layered cylindrical tubular rods that are capable of.

A further object of the present invention is to form a generally cylindrical smoking article in which the cylindrical member can be easily inserted at a later stage, ensuring a seal between the pieces and the member, e.g. to allow air to pass through the member. To provide a multi-layered cylindrical tubular rod piece suitable for

These objects are achieved by a method and machine for forming a piece of multi-layered cylindrical tubular rod having the features set forth in one or more of the appended claims.

These objects are also met by a multi-layered cylindrical tubular rod piece suitable for forming a generally cylindrical smoking article having the features set forth in one or more of the appended claims.

By performing each step on a single machine, there is the advantage that phase shifts along the feed direction can be avoided. Also, by wrapping the continuous multi-layer web around the feed direction to form a multi-layer cylindrical tubular rod forming at least one end seam, variations in piece shape and size can be reduced, thus reducing the specific conform to shape and size tolerances of

Preferably, the rod piece obtained comprises a first layer with a first seam, a second continuous layer with a second seam and optionally a third continuous layer with a third seam. and at least one of the first seam and the second seam is formed as an end-to-end seam.

Preferably, a first material is used comprising one or more of metal material, plastic material and paper material.

Preferably, a first layer, a second layer and a third layer are used, wherein the thickness of the second layer and the third layer are the same. For example, by providing a single continuous web and dividing it longitudinally into two continuous web portions constituting a second continuous web and a third continuous web, layers of equal thickness can be obtained. is obtained. Alternatively, the second and third layers have different thicknesses.

Preferably, both the first seam and the second seam are end-to-end seams. The third seam can be an end-to-end seam that is offset with respect to the first or second seam, or it can be a lap seam that is preferably offset with respect to the first or second seam.

Further features and advantages of the present invention are a piece of a multi-layer cylindrical tubular rod suitable for forming a generally cylindrical smoker article and a multi-layer cylindrical tubular rod piece suitable for forming a generally cylindrical smoker article. It will become further apparent from the following illustrative and thus non-limiting description of preferred and therefore non-exclusive embodiments of the method and machine for forming pieces.

The invention will now be described with reference to the accompanying drawings, which show non-limiting embodiments of the invention.
1 shows a transverse cross-section of a first embodiment of a multi-layered cylindrical tubular rod; 1 shows a production schematic of a first embodiment of a multi-layered cylindrical tubular rod; FIG. 1 shows a longitudinal section of a first embodiment of a multi-layered cylindrical tubular rod; Fig. 1a shows a variant of Fig. 1a; Fig. 1b shows a variant of Fig. 1b; Fig. 1c shows a variant of Fig. 1c; Fig. 1a shows a variant of Fig. 1a; Fig. 1b shows a variant of Fig. 1b; Fig. 1c shows a variant of Fig. 1c; Fig. 1a shows a variant of Fig. 1a; Fig. 1b shows a variant of Fig. 1b; Fig. 1c shows a variant of Fig. 1c; Fig. 1a shows a variant of Fig. 1a; Fig. 1b shows a variant of Fig. 1b; Fig. 1c shows a variant of Fig. 1c; Fig. 1a shows a further variant of Fig. 1a; Fig. 1b shows a further variant of Fig. 1b; Fig. 1c shows a further variant of Fig. 1c; Fig. 3 shows a further product schematic; 1 is a schematic front view of a machine for forming pieces of multilayer cylindrical tubular rods, filter rods, according to a first embodiment; FIG. FIG. 2 is a schematic front view of a machine for forming pieces of multi-layered cylindrical tubular rods according to a second embodiment; Fig. 8 shows an enlarged view of a detail of Fig. 7; Figure 10 is a side view of the detail of Figure 9; Fig. 8 shows an enlarged view of a detail of Fig. 7; Figure 12 is a side view of the detail of Figure 11;

Referring to the accompanying drawings, reference numeral 1 designates a multi-layer cylindrical tubular rod from which pieces suitable for forming generally cylindrical smoker articles are obtained.

The rod 1 (thus the piece of rod 1 is not shown) comprises a first layer 2 of a first material. so as to form a first seam 3 of each lateral edge 4 of the first layer 2;
Joined in the longitudinal direction.

The rod 1 (thus the piece of rod 1 is not shown) is provided with a second layer 5 of a second material. so as to form a second seam 6 of each lateral edge 7 of the second layer 5;
Joined in the longitudinal direction.

The first layer 2 occupies a radially inner position with respect to the second layer 5 in both pieces and rods 1 .

The second layer 5 is continuous along the main direction of extension "X" of the rods 1, coinciding with the feeding direction of the rods, during production of the pieces.

At least one of the first seam 3 and the second seam 6 is formed as an end-to-end seam, ie a seam formed so that the two respective lateral edges do not overlap.

The first material and the second material are different. For example, the first material can be a metallic material and the second material can be a paper material.

FIGS. 1a and 1c show a rod 1 in which the first layer 2 is also continuous along the main direction of extension 'X' of the rod 1. FIG. Further, both the first seam 3 and the second seam 6 are end-to-end seams and are offset from each other, ie, arranged at different angular positions circumferentially in direction "X". FIG. 1b shows a step in the production of a rod 1 from a continuous multi-layer web "M" comprising a first layer 2 and a second layer 5 both lying flat. Also shown is an intermediate layer 8 of adhesive material arranged between the first layer 2 and the second layer 5 .

2a and 2c show a rod 1 with a third layer 9 occupying a radially outer position with respect to the first layer 2 and the second layer 5. FIG. Each lateral edge 4 of the third layer 9
are longitudinally joined to form a third seam 10 of the . First seam 3 and second seam 6
and are end-to-end seams and are preferably positioned at the same angular position circumferentially in direction "X". The third seam 10 is an end-to-end seam and is offset relative to the first and second seams, i.e., positioned at another different angular position circumferentially in direction "X".

Referring again to Figures 2a and 2c, the first layer 2 is a discontinuous layer, comprising a series of strips 14 alternating with interstices 15 along the feed direction. In this case complete closure of the rod 1 is ensured by the third layer 9 and the third seam 10 offset from the other seams.

Figure 2b shows a step in the production of a rod 1 from a continuous multilayer web "M" comprising a first layer 2, a second layer 5 and a third layer 9 all lying flat. Also an intermediate layer 8 of adhesive material arranged between the first layer 2 and the second layer 5 and a further intermediate adhesive layer 12 arranged between the second layer 5 and the third layer 9; Illustrated. The third layer overlaps the first and second layers along a direction perpendicular to direction "X" such that corresponding respective third seams 10 are offset with respect to first seam 3 and second seam 6. offset with respect to

The second layer 5 and the third layer 9 are of the same thickness and are preferably obtained by longitudinally dividing a single continuous web, as described below.

3a and 3c show a rod 1 with a third layer 9 occupying a radially outer position with respect to the first layer 2 and the second layer 5. FIG. Each lateral edge 4 of the third layer 9
are longitudinally joined to form a third seam 10 of the . Unlike the rods of Figures 2a and 2c, the second layer 5 and the third layer 9 have different thicknesses. In particular, the second layer 5 has a smaller thickness than the third layer 9 . In this case the function of the second layer 5 is that of transporting the first layer 2 . The reduced thickness makes it easier to wrap the reduced thickness around itself and can be made to better absorb the adhesive material of the intermediate layer 8 . The third layer 9 acts primarily as a support layer, giving the rods 1 and associated pieces the necessary rigidity to maintain their shape.

Referring again to Figures 3a and 3c, the first layer 2 is a discontinuous layer, comprising a series of strips 14 alternating with interstices 15 along the feed direction. In this case complete closure of the rod 1 is ensured by the third layer 9 and the third seam 10 offset from the other seams. FIG. 3b is similar to FIG. 2b.

FIGS. 4 a and 4 c show a rod 1 with a third layer 9 occupying a radially outer position with respect to the first layer 2 and the second layer 5 . Each lateral edge 4 of the third layer 9
are longitudinally joined to form a third seam 10 of the . Unlike the rods of Figures 2a and 2c, the second layer 5 and the third layer 9 have different thicknesses. In particular, the second layer 5 is thicker than the third layer 9 . In this case, the second layer 5 acts both as a layer for transporting the first layer 2 and as a support layer giving the rods 1 and associated pieces the necessary rigidity to maintain their shape. . The function of the third layer 9 is primarily to enhance the aesthetic appearance and to help keep the second layer 5 closed.

Referring again to Figures 4a and 4c, the first layer 2 is a discontinuous layer, comprising a series of strips 14 alternating with interstices 15 along the feed direction. In this case complete closure of the rod 1 is ensured by the third layer 9 and the third seam 10 offset from the other seams. FIG. 4b is similar to FIG. 2b.

Figures 5a and 5c show a rod 1 with a third layer 9 occupying a radially outer position with respect to the first and second layers. The third layers 9 are joined longitudinally to form a third seam 10 of each lateral edge 4 of the third layer 9 . Unlike the rods of Figures 2a and 2c, the third seam 10 is a lap seam and is preferably offset from the first seam 3 or the second seam 6, i.e. circumferentially separate in direction "X". placed at different angular positions.

Referring again to Figures 5a and 5c, the first layer 2 is a discontinuous layer, comprising a series of strips 14 alternating with interstices 15 along the feed direction. In this case complete closure of the rod 1 is ensured by the third layer 9 and the third seam 10 which is a lap seam offset from the other seams.

Figure 5b shows a step in the production of a rod 1 from a continuous multi-layer web "M" comprising a first layer 2, a second layer 5 and a third layer 9 all lying flat. Also an intermediate layer 8 of adhesive material arranged between the first layer 2 and the second layer 5 and a further intermediate adhesive layer 12 arranged between the second layer 5 and the third layer 9; Illustrated. The third layer 9 consists of the first layer 2 and the second layer 5
aligned with at least one of the lateral edges of the

Figures 6a and 6c show a rod 1 with a third layer 9 occupying a radially outer position with respect to the first and second layers. The third layers 9 are joined longitudinally to form a third seam 10 of each lateral edge 4 of the third layer 9 . Unlike the rod of FIGS. 2a and 2c, the first seam 3 is a lap seam, the second seam 6 is an end-to-end seam, and the third seam 10 is a lap seam and either the first seam 3 or the second seam. It is preferably offset from seam 6 . The second layer 5 and the third layer 9 have different thicknesses. In particular, the second layer 5 is thicker than the third layer 9 .

Referring again to Figures 6a and 6c, the first layer 2 is a discontinuous layer, comprising a series of strips 14 alternating with interstices 15 along the feed direction. In this case complete closure of the rod 1 is ensured by the third layer 9 and the third seam 10 offset from the other seams. The continuity of the first layer 2 along the circumferential direction is ensured by a first seam 3 which is a lap seam.

Figure 6b shows a rod 1 from a continuous multi-layer web "M" comprising a first layer 2 and a second layer 5 which are both flattened and which form an intermediate rod 13 when subsequently wound onto themselves shows a step in the production of Also shown is an intermediate layer 8 of adhesive material arranged between the first layer 2 and the second layer 5 . FIG. 6d shows a further step in the production of rods 1 from intermediate rods 13 and third layer 9. FIG. To form rod 1 , third layer 9 is wrapped around intermediate rod 13 . Also shown is a further intermediate adhesive layer 12 arranged between the second layer 5 and the third layer 9 .

In all examples shown and/or described, the first material comprises one or more of a metallic material, a plastic material, and a paper material.

Figures 7 and 8 show a multilayer cylindrical tubular rod 1 suitable for forming a substantially cylindrical smoker article.
2 shows two possible forms of machine 100 for forming pieces of . More specifically,
Machine 100 is configured to form pieces of rod 1 according to one or more of the examples shown and/or described above.

The machine 100 comprises a first means 101 for supplying at least a first continuous web 102 of a continuous multilayer web “M” and of a first material suitable for forming the first layer 2 of the rod 1 .

The machine 100 comprises a second means 103 for supplying a second continuous web 104 of a second material suitable for forming the continuous multilayer web "M" and the second continuous layer 5 of rods 1 .

First continuous web 102 and/or second continuous web 104 are preferably placed on roll "B" which is drawn by respective means 102, 103 for supplying the continuous web.

Along the feed path of the second continuous web 104, a bonding device 105 configured to apply a layer of adhesive material onto the second continuous web 104 to form the intermediate layer 8 of adhesive material of the rod 1 placed. The intermediate layer 8 is preferably continuous. The adhesive device 105 can be embodied by rollers, sprays or other means, for example.

a cutting device 106 configured to cut the first continuous web 102 into strips 14;
may be positioned along the feed path of first continuous web 102 . If the first layer 2 is discontinuous, ie comprising a series of strips 14 interleaved with gaps 15, a cutting device 106 is provided. The cutting device 106 can be an impact or scissors type cutter,
or can be embodied by other means.

Reference number 107 indicates a means for forming a continuous multilayer web "M" by overlapping at least the first layer 2 and the second layer 5 . These means are embodied, for example, by a conveyor 108 arranged to receive the second continuous web 104 constituting the second layer 5 and the strip 14 of the first continuous web 102 constituting the first discontinuous layer 2 . bed 107
a (alternatively the conveyor receives the first continuous web 102 constituting the first continuous layer 2). Conveyor 108 is also configured to feed the continuous multilayer web "M" along the feed direction "X"; Concrete means.

Conveyor 108 preferably receives a second continuous web 104 having intermediate layer 8 applied thereon. Above the intermediate layer 8 a strip 14 of the first continuous web 102 is placed by a drum 109 associated with a cutting device 106 .

A continuous multilayer web "M" is thus obtained downstream of the drum 109 such that the first layer 2 occupies a radially inner position relative to the second layer 5 on the rod 1 .

Downstream of the conveyor 108 means 110 are arranged for forming the rods 1 circumferentially in the feed direction "X". Means 110 form the seams of the layers that make up the rod itself.

The means 110 comprise a forming beam 110a having a groove whose cross-section can vary along the feeding direction 'X' for winding the continuous multilayer web 'M' around the feeding direction 'X' to form the rod 1. be able to.

Downstream of the means 110 for forming the rod 1 are arranged means 111 for cutting the rod 1 into pieces.

Preferably, the machine 100 cuts the lateral edges of at least one of the first layer 2 and the second layer 5 so as to form at least one of the first seam 3 and the second seam 6 as an end-to-end seam. configured to place

Third means 112 may also be provided for supplying a third continuous web 113 of a third material suitable for forming the third layer 9 of rods 1, as shown in FIGS. The third continuous web 113 , and thus the third layer 9 , is arranged to occupy a radially outer position in the rod 1 with respect to the first layer 2 and the second layer 5 .

Along the feed path of the third continuous web 113 is arranged a bonding device 105 a configured to apply a further intermediate adhesive layer 12 arranged between the second layer 5 and the third layer 9 . The adhesive device 105 can be embodied by rollers, sprays or other means, for example.

In the example shown in FIG. 7, the third means 112 apply the third web 1 to form the third layer 9 .
13 downstream of conveyor 108 and upstream of means 110 . in this way,
The first layer 2, second layer 5 and third layer 9 form a continuous multilayer web "M" and are integrally wrapped upon themselves along the forming beam 110a.

If desired, the machine 100 can include two blades 114 positioned on opposite sides of the continuous multi-layer web "M" and configured to trim the edges thereof. In the case of FIG. 7, blade 114 is a circular blade and uses as an anvil element a flat surface 115 on which at least one working portion of conveyor 108 slides. The blade is mounted on the drum 109
, thus cutting a continuous multi-layer web “M” comprising a first layer 2 and a second layer 5 .

Optionally, the machine 100 is configured to preform the continuous multilayer web "M" prior to winding the continuous multilayer web "M" onto itself to form the rod 1. A molding device 116 may be provided. 11 and 12 illustrate a molded groove 117 that can be used in any machine for forming rod 1 and is formed to receive a continuous multi-layer web "M" and a molded groove 117. Forming apparatus 116 comprising forming elements, such as wheels 118, for forming channel-like features at least partially contained in the continuous multilayer web extending along the middle thereof in the feed direction "X". give a possible example of Forming apparatus 116 forms a continuous multi-layer web "M" comprising only first layer 2 and second layer 5, or first layer 2, second layer 5 and third layer 9 as shown in FIG. A continuous multi-layer web "M" comprising

The machine 100 shown in FIG. 8 differs from the machine shown in FIG. 7 in that it has two shaping beams. The first shaping beam 110a is similar to that shown in FIG. 7 and is configured to form the rod 1 . A further forming beam 119 is positioned on conveyor 108 for winding the continuous multilayer web "M" comprising first layer 2 and second layer 5 thereon to form intermediate rod 13 . A third continuous web 113 is fed between a further shaping beam 119 and a shaping beam 110a in order to wrap the third continuous web 113 around the intermediate rod 13 to form the rod 1 .

In use, the machine 100 is configured to function according to a method of forming pieces of multi-layered cylindrical tubular rods suitable for forming generally cylindrical smoker articles.

The method described above comprises step a) of providing a first continuous web 102 of at least a first material suitable for forming a first layer 2 of a continuous multilayer web "M". This step is performed by the first supply means 101, for example.

The method described above includes step b) of providing a second continuous web 104 of a second material suitable for forming a second continuous layer 5 of a continuous multilayer web "M". This step is performed by the second supply means 103, for example.

a third continuous web 1 of a third material preferably suitable for forming the third layer 9 of the rod 1
There is a step f) of providing 13. The third layer 9 is arranged on the rod 1 so as to occupy a radially outer position with respect to the first layer 2 and the second layer 5 .

The method described above superimposes at least the first layer 2 and the second layer 5 such that the first layer 2 is arranged in the rod 1 such that it occupies a radially inner position with respect to the second layer 5. forming a continuous multilayer web 'M' by feeding the continuous multilayer web 'M' along a feeding direction 'X'. This step is performed, for example, by means 107 and conveyor 108 .

The method described above involves wrapping a continuous multi-layer web "M" around the feed direction "X",
comprises a step d) of forming at least a first seam 3 on the lateral edge of the first layer 2 and a second seam 6 on the lateral edge of the second layer 5 to form the . This process comprises a forming beam 110 for forming a continuous multi-layer web "M" comprising a first layer 2, a second layer 5 and optionally a third layer 9.
a, or in forming beam 119 to form a continuous multi-layer web "M" comprising first layer 2 and second layer 5. In the latter case, shaping of the rod 1 can also be achieved by wrapping the third layer 9 around the intermediate rod 13, if desired.

The method described above comprises step e) of cutting the rod 1 into pieces.

Steps a) to e) are performed in a single machine 100 for forming the multi-layered cylindrical tubular rod 1 . Step d) also positions the lateral edges of at least one of the first layer 2 and the second layer 5 so as to form at least one of the first seam 3 and the second seam 6 as an end-to-end seam. It is executed by

Preferably there is the step of forming strips 14 of the first continuous web 102 to form the first discontinuous layer 2 along the feed direction "X". The first layer 2 comprises a series of strips 14 alternating with interstices 15 along the feed direction. This step is performed by the cutting device 106, for example.

optionally providing a single continuous web suitable for forming the second layer 5 and the third layer 9; and longitudinally dividing into two continuous web portions comprising the third continuous web 113 and the third continuous web 113 . In this case, second continuous web 104 and third continuous web 113 have the same thickness. Alternatively, second continuous web 104 and third continuous web 113 have different thicknesses.

As shown in FIG. 7, step c) comprises first forming a continuous multi-layer web "M" by superimposing a first layer 2 and a second layer 5, and then adding a third layer 9. ,including. The resulting continuous multi-layer web "M" (i.e. comprising the first layer 2, the second layer 5 and the third layer 9) is wrapped around itself in the feed direction "X". It is wound to form a rod 1.

In a possible embodiment, step d) comprises positioning the lateral edges of the first layer 2 to form a first end-mating seam 3 and the second edge-mating seam 6 to form a second end-mating seam 6 . This can be done by arranging the lateral edges of layer 5 .

In this case, step c) may comprise offsetting the third layer 9 with respect to at least one of the first and second layers along a direction perpendicular to the feed direction "X", step d)
can be performed by arranging the lateral edges of the third layer to form a third end seam 10 (FIGS. 2a-4a). Alternatively, step d) can be carried out by arranging the lateral edges of the third layer 9 such that the third seam is an overlap seam (Fig. 5a).

As shown in Figure 8, step c) involves forming a continuous multi-layer web "M" by overlapping the first layer 2 and the second layer 5 . Continuous multilayer web “M” is then wrapped around itself to form intermediate rod 13 and a third continuous web 113 is wrapped around intermediate rod 13 .
is juxtaposed with the third continuous web 113 and thus the third layer 9 for winding around to form the rod 1 . In other words, step g) of winding the third layer 9 around an intermediate rod 13 already formed by winding the first and second layers around themselves.
There is Preferably, step d) comprises positioning the lateral edges 4 of the first layer 2 to form at least a first overlap seam 3 and the second layer 5 to form a second end joining seam 6. This can be done by arranging the lateral edges 7 . Preferably step g) comprises the third overlap seam 1
This is done by arranging the lateral edges 11 of the third layer 9 to form 0 (Fig. 6a).

If desired, the edges of the continuous multilayer web "M" can be trimmed before the web is wrapped around itself to form a multilayer cylindrical tubular rod. More specifically, the first layer 2
and the second layer 5, the edges of the continuous multilayer web "M" can be trimmed in embodiments in which the third layer 9 is provided.

Optionally, groove-like features extending along the feed direction "X" are formed in the continuous multilayer web before the continuous multilayer web "M" is wrapped around itself to form a rod 1. can give a preliminary shape.

In another embodiment not shown, the machine 100 is configured to form a rod 1 comprising only a first layer 2 and a second layer 5 with first and second end seams. . In this case, the first layer 2 is continuous along the feed direction "X" and the first layer 2 and the second layer 5
are offset in a direction perpendicular to the feed direction "X".

Even in an aspect independent of the aspects described in the previous aspects, the method according to the invention comprises:
It is possible to have the second layer 2 and the third layer 9 of the same or different thickness. In the first case, the steps of providing a single continuous web suitable for forming the second layer and the third layer; longitudinally dividing into two continuous web portions that make up the tricontinuous web 113 .

International Patent Application Publication No. 2014/188318

Claims (18)

A method of forming a piece of multi-layered cylindrical tubular rod (1) suitable for forming a substantially cylindrical smoker article, comprising:
a) providing at least a first continuous web (102) of a first material suitable for forming a first layer (2) of a continuous multilayer web (M);
b) providing a second continuous web (104) of a second material suitable for forming a second continuous layer (5) of said continuous multilayer web (M);
c) at least said first layer (2) is arranged in said rod (1) such that it occupies a radially inner position with respect to said second layer (5); ) and said second layer (5) to form said continuous multilayer web (M) and feeding said continuous multilayer web (M) along a feeding direction (X);
d) winding said continuous multilayer web (M) around said feed direction (X), rod (1)
To obtain at least the first seam (3) of the lateral edge (4) of said first layer (2) and the second seam (6) of the lateral edge (7) of said second layer (5) ) and
e) cutting said rod (1) into pieces;
in the method comprising
Steps a)-e) are performed in a single machine (100
), and
Said step d) comprises combining said first layer (2) and said second layer (5) such that at least one of said first seam (3) and said second seam (6) is formed as an end-to-end seam. A method achieved by arranging at least one lateral edge (4,7) with A method of forming a piece of multi-layered cylindrical tubular rod according to claim 1, comprising:
f) providing a third continuous web (113) of a third material suitable for forming a third layer (9) of said rods (1);
Said third layer (9) comprises said first layer (2) and said second layer (5) in said rod (1).
) so as to occupy a radially outward position with respect to the 3. A method of forming a piece of multi-layer cylindrical tubular rod according to claim 2, comprising:
Said step c) comprises forming said continuous multilayer web (M) by superimposing said first layer (2), said second layer (5) and said third layer (9). cage,
Preferably, said step d) comprises positioning said lateral edge (4) of said first layer (2) to form a first end-mating seam (3) and forming a second end-mating seam. A method achieved by arranging said lateral edge (7) of said second layer (5) to form (6). 4. A method of forming a piece of multi-layer cylindrical tubular rod according to claim 3, comprising:
Said step c) comprises: said third layer (9) against at least one of said first layer (2) and said second layer (5) along a direction perpendicular to said feeding direction (X); includes a step of offsetting
Said step d) is achieved by positioning the lateral edge (11) of said third layer (9) to form a third end-to-end seam (10), or said step d) , a method achieved by arranging the lateral edges (11) of said third layer (9) to form a third overlap seam (10). 3. A method of forming a piece of multi-layer cylindrical tubular rod according to claim 2, comprising:
Said continuous multilayer web (M) formed by superimposing said first layer (2) and said second layer (5) comprises intermediate rods (13) juxtaposed with said third layer (9). wrapped to form,
g) said third layer (9) already wound to form said intermediate rod (13) so as to form a third seam (10) of said lateral edge (11) of said third layer (9); layer (2
) and wrapping said third layer (9) around said second layer (5),
Preferably, said step d) comprises positioning said lateral edges (4) of said first layer (2) to form at least a first overlap seam (3) and a second end mating seam ( achieved by arranging said lateral edge (7) of said second layer (5) to form 6),
Preferably, said step g) is accomplished by positioning said lateral edge (11) of said third layer (9) to form a third overlap seam (10). A method of forming a piece of a multilayer cylindrical tubular rod according to one or more of claims 1 to 5, wherein before winding the continuous multilayer web (M) to form a multilayer cylindrical tubular rod (1), said A method comprising trimming the edges of a continuous multilayer web (M). A method of forming a piece of a multilayer cylindrical tubular rod according to one or more of claims 1 to 6, wherein before winding the continuous multilayer web (M) to form a multilayer cylindrical tubular rod (1), said A method comprising the step of pre-shaping said continuous multilayer web (M) so as to form a central shape extending in said feed direction (X) along the middle of said continuous multilayer web (M). A method of forming a piece of multi-layered cylindrical tubular rod according to one or more of claims 1 to 7, wherein strips (14) of said first continuous web (102) are formed, said first discontinuous layer (2)
) along said feed direction (X), said first discontinuous layer (2) being a series of strips (14) alternating with interstices (15) along said feed direction. ). A method of forming a piece of multi-layered cylindrical tubular rod according to one or more of claims 1-7, comprising:
forming a first continuous layer (2) along said feeding direction (X);
Preferably, said step c) removes said first layer (
2) and offsetting said second layer (5);
Said step d) comprises positioning said lateral edges (4) of said first layer (2) and said lateral edges (7) of said second layer (5) end-to-end. The method achieved by In a machine (100) for forming pieces of multi-layered cylindrical tubular rods suitable for forming generally cylindrical smoker articles, comprising:
first means (101) for supplying at least a first continuous web (102) of a first material suitable for forming a first layer (2) of a continuous multilayer web (M);
second means (103) for supplying a second continuous web (104) of a second material suitable for forming a second continuous layer (5) of said continuous multilayer web (M);
with at least said first layer (2) such that said first layer (2) is arranged in said rod (1) such that it occupies a radially inner position with respect to said second layer (5); The second layer (
5), means (107) for forming said continuous multilayer web (M) by overlapping 5); means (108) for feeding said continuous multilayer web along a feeding direction (X);
Means (110) for forming said rod (1) around said feeding direction (X), said means (110) forming a seam (3, 6, 10) of the layers constituting said rod itself. When,
means (111) for cutting said rod (1) into pieces;
and
Said machine (100) is adapted to separate said first layer (2) and said second layer (5) so as to form at least one of said first seam (3) and said second seam (6) as an end-to-end seam. ) and at least one lateral edge (4,7). A machine (100) for forming pieces of multi-layer cylindrical tubular rods according to claim 10, comprising:
a third continuous web of a third material suitable for forming the third layer (9) of said rod (1) (
113), comprising third means (112) for supplying
Said third layer (9) comprises said first layer (2) and said second layer (5) in said rod (1).
) so as to occupy a radially outward position with respect to A machine (100) for forming a piece of multi-layer cylindrical tubular rod according to claim 11, comprising:
Said means (110) for forming said rods (1) around said feeding direction (X) comprises said continuous multilayer web ( M) wrapped to form an intermediate rod (13), comprising an upstream shaping beam (119);
A machine comprising a downstream forming beam (110a) configured to wrap said third continuous web (113) around said intermediate rod (13) to form said rod (1). A machine for forming pieces of multilayer cylindrical tubular rods according to one or more of claims 10 to 12, characterized in that two (2) pieces are arranged on opposite sides of said continuous multilayer web (M) and adapted to trim the edges thereof. A machine comprising a blade (114). Machine for forming pieces of multi-layer cylindrical tubular rods according to one or more of claims 10-13, wherein before winding said continuous multi-layer web (M) to form said rod (1), said continuous multi-layer A machine comprising a forming device (116) configured to impart a preliminary shape to a web (M). a first layer (2) of a first material having a first seam (3) on each lateral edge (4);
a second continuous layer (5) of a second material having a second seam (6) at each lateral edge (7);
and
A multilayer cylindrical tubular rod (1) suitable for forming a generally cylindrical smoking article, wherein said first layer (2) occupies a radially inner position relative to said second layer (5). in peace,
A piece in which at least one of said first seam (3) and said second seam (6) is formed as an end-to-end seam. A piece of multi-layered cylindrical tubular rod according to claim 15, wherein
A third layer of a third material occupying a radially outer position with respect to said first layer (2) and said second layer (5) and comprising a third seam (10) at each lateral edge (11). comprising three consecutive layers (9),
Preferably,
said first seam (3) is a lap seam,
said second seam (6) is an end-to-end seam,
Said third seam (10) is a lap seam, preferably a piece that is offset with respect to said first seam (3) and said second seam (6). 17. Piece of multi-layer cylindrical tubular rod according to claim 16, wherein said second layer (5) and said third layer (9) have different thicknesses. In a piece of multilayer cylindrical tubular rod according to one or more of claims 15-17,
said first layer (2) is continuous along said feed direction (X),
said first seam (3) and said second seam (6) are end-to-end seams and are offset from each other, or
Said first layer (2) is a discontinuous layer, comprising a series of strips (14) interleaved with gaps (15) along said feed direction (X).

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