Technical field
[0001] This invention relates to a method for checking the position of an adhesive label
on a sheet material.
[0002] More specifically, this invention relates to a method for checking the correct positioning
of an adhesive label applied to sheet material forming or designed to form an inner
wrapper in a container such as a packet of cigarettes of the "sealed" type.
[0003] In the description which follows, reference is made, by way of example, to containers,
in particular of the rigid type, consisting of packets of cigarettes, without thereby
restricting the scope of the invention.
Background art
[0004] Rigid, hinged-lid packets for cigarettes are currently the cigarette packets of the
most widespread type on the market because they are simple to make, easy and practical
to use and provide good mechanical protection for the cigarettes they contain.
[0005] Normally, a rigid, hinged-lid packet for cigarettes comprises a hollow container
having an extraction opening at the top of it for taking out the cigarettes and a
lid which has a downward facing concavity and which is joined to the container along
a hinge allowing it to rotate relative to the container itself between a position
where the opening is open and a position where it is closed.
[0006] The container houses an inner wrapper, usually made of metallized paper and wrapped
around a group of cigarettes.
[0007] To better protect the tobacco in the cigarettes, it is frequent to make cigarette
packets, commonly known as "sealed packets", where the inner wrapper has an opening
for extracting the cigarettes and is provided with a re-positionable label with a
tab which can be held between two fingers and pulled in order to move part of the
label away from the inner wrapper. The label usually covers a large part of the top
of the packet and an upper portion of the front wall of the inner wrapper and is provided
with spots of adhesive material which allow it to be placed in a closed position several
times after every extraction of a cigarette from the inner wrapper.
[0008] Once the labels have been applied to the inner wrappers, during the production of
the cigarette packets, it is necessary to check that their position is correct relative
to the opening to be used for extracting the cigarettes.
[0009] Usually, this check is performed using control devices of the optical type, which
identify on each label the position of a printed ornamental pattern and compare a
parameter relating to the position detected with a sample parameter to determine,
even quantitatively, any deviations in the position of the label relative to the correct
position.
[0010] This operating method is inadequate if the labels are only printed with ornamental
patterns having muted colours or with colours having little contrast with the background
of the label, since, in these cases, the control devices are unable to easily identify
the edge zones of the ornamental patterns.
[0011] In order to overcome this problem, use is sometimes made of the practice of printing
reference marks (eyemarks) on the labels, having features which can be easily detected
by the control devices of the optical type.
[0012] However, even this practice does not constantly lead to satisfactory results, since
it has been found that the position tolerances of the reference marks on the material
in the form of a web from which the labels are made are very high, even reaching values
close to a millimetre, and a position error of the label of that extent relative to
the opening designed for extracting cigarettes from the inner wrapper of a packet
of cigarettes is considered absolutely unacceptable.
EP 1 770 015 A2 discloses a method for checking the position of an adhesive label on a sheet material
in accordance with the preamble of claim1.
Disclosure of the invention
[0013] The aim of this invention is to provide a method for checking the position of an
adhesive label on a sheet material, forming an inner wrapper of a container such as
a packet of cigarettes of the "sealed" type, which is capable of overcoming the drawbacks
described above with reference to the prior art.
[0014] The invention accordingly provides a method for checking the position of an adhesive
label applied to sheet material as described in one or more of the appended claims.
[0015] More specifically, according to this invention, a method is provided for checking
the position of an adhesive label on a sheet material, the sheet material forming
or being designed to form a wrapper forming part of a packet of cigarettes, and the
label being applied to the sheet material after its separation from a web; the method
comprises, before separation of the label from the web, the printing on the label
of at least a centering mark extending as far as the outer perimeter of the label;
the check of the position of the label on the sheet material occurring through the
detection of the position of the part of the perimeter of the label on which the centering
mark extends.
[0016] In this way, the centering mark highlights the contrast of the outer perimeter of
the label relative to the sheet material which forms the background. In other words,
the centering mark optimises the contrast between the sheet material and the perimeter
of the label, and the latter is used as a position marker in the control process.
[0017] Preferably, during the printing process, the centering mark of the label projects
onto the web beyond the outer perimeter of the label.
[0018] Preferably, the centering mark of the label comprises at least one perimetric edge
coinciding with a respective perimetric edge of the label.
[0019] Preferably, the centering mark comprises a first and a second centering eye mark,
the eye marks extending, respectively, as far as a first and a second perimetric edge
of the label; the first and second perimetric edges starting from a same vertex of
the label.
[0020] Preferably, the centering mark comprises a first and a second centering eye mark,
the eye marks extending, respectively, as far as a first and a second perimetric edge
of the label; the first and second perimetric edges being at right angles, or substantially
at right angles, to each other.
[0021] In that way, the control process may comprise a check of the position of the label
according to two orthogonal directions, that is, according to two Cartesian axes on
the plane on which the label lies.
[0022] Alternatively, it may be preferable that the centering mark comprises a single centering
eye mark, extending as far as a vertex of the label formed by a first and a second
perimetric edge of the label. In that case, it is preferable that the single centering
eye mark has a substantially triangular shape or is substantially "L" shaped. In this
case, it is preferable that the perimetric edges which define the vertex of the label
are at right angles to each other, in such a way that the control process can comprise
a check of the position of the label according to two orthogonal directions, that
is, according to two Cartesian axes on the plane on which the label lies.
[0023] It is also preferable that the centering mark be printed using invisible ink, that
is to say, not visible by the human eye with sources of light in the field of vision.
In that case, it is preferable that the centering mark be printed using an ink which
is visible under lighting within the ultraviolet or infrared range.
Brief Description of the Drawings
[0024] This invention is described below with reference to the accompanying drawings, which
illustrate a non-limiting embodiment and in which:
- Figures 1 and 2 show respective perspective views of a cigarette packet comprising
an inner wrapper of a sealed type equipped with a repositionable adhesive label for
opening and closing;
- Figures 3 to 6 illustrate four different embodiments of an adhesive label which can
be used in the packet of Figures 1 and 2;
- Figure 7 shows a web from which the adhesive labels of Figures 3 to 6 are made.
Detailed Description of the Preferred Embodiments of the Invention
[0025] With reference in particular to Figure 1, the numeral 1 denotes in its entirety a
rigid cigarette packet comprising an outer container 2 and an inner wrapper 3 housed
inside the container 2. The packet 1, in the embodiment of Figures 1 and 2, is of
the hinged lid type, but it might be of any other type.
[0026] Preferably, the outer container 2 is made of stiff card or paperboard.
[0027] The outer container 2 has a lid 4 which is joined to the container 2 along a hinge
5 allowing it to rotate relative to the container 2 itself between an open condition
and a closed condition and vice versa.
[0028] In variant embodiments of the invention, the container 2 might house more than one
inner wrapper 3, as described for example in patent application
WO200230790A2.
[0029] When the packet 1 is in the closed condition, the lid 4 gives the outer container
2 the shape of a rectangular parallelepiped having a top wall 6 and a bottom wall
7 which are parallel and opposite to each other, two large side walls 8 and 9 which
are parallel and opposite to each other, defining the front and rear walls of the
packet 1, respectively, and two small side walls 10 which are parallel and opposite
to each other, defining the respective flanks of the packet 1.
[0030] The lid 4 comprises a front wall 11 which, in the closed condition of the packet
1, forms part of the front wall 8 of the packet 1.
[0031] The lid 4 comprises two side walls 14 which, in the closed condition of the packet
1, combine to form the respective flanks 10 of the packet 1.
[0032] In the embodiments illustrated in the accompanying drawings and described below,
the cigarette packet 1 does not have what is known as the inner frame, but without
thereby excluding alternative embodiments, not illustrated, where the packet 1 does
have an inner frame.
[0033] The packet 1 comprises a group 15 of cigarettes 16 wrapped in the inner wrapper 3.
[0034] At the top and front of it, the inner wrapper 3 has an opening 17 for taking out
the cigarettes 16 and is substantially sealed from the outside of the opening 17 so
as to maintain the aroma and/or the humidity of the cigarettes 16.
[0035] A label 18 allows opening and closing the inner wrapper 3, making it possible to
take out the cigarettes 16 through the extraction opening 17.
[0036] The label 18 is fixed to the inner wrapper 3 by at least one film, not illustrated,
of re-positionable adhesive.
[0037] More specifically, the label 18 comprises an inside face, not illustrated, directed
towards the group 15 of cigarettes 16, and an outside face 21, directed towards the
lid 4.
[0038] The inner face of the label 18 has the film of re-positionable adhesive.
[0039] When the packet 1 is in the closed condition, the film of adhesive is located around
the upper edges and the front edge of the extraction opening 17.
[0040] It should be noted that a portion 22 of the precut inner wrapper 3 is (preferably)
glued to the inside face (not illustrated) of the label 18, thus sealing in the cigarettes
16. When the packet 1 is opened for the first time, the portion 22 of the wrapper
3 is removed by means of the label 18, thus defining the opening 17 of the inner wrapper
3.
[0041] When the packet 1 is in the closed condition, a front edge of the label 18 is associated
with a tongue 23 which is located at least partly under the front wall 11 of the lid
4.
[0042] The tongue 23 defines a grip tab which facilitates lifting the label 18 from the
wrapper 3 to access the cigarettes 16 inside the wrapper 3 and repositioning the label
18 in contact with the wrapper 3 after taking out a cigarette 16 .
[0043] As shown in Figures 3 to 6, the label 18 has, on its surface opposite the surface
designed to adhere to the inner wrapper 3, a printed film which, as will become clearer
as this description continues, constitutes a centering mark 33 which may comprise
one or two printed marks (eyemarks) shaped and positioned in different ways in Figures
3 to 6.
[0044] The centering mark 33 of the label 18 of Figure 3 comprises a single mark 24 printed
with a triangular shape, positioned at a vertex of the label 18 (at the top left in
Figure 3) and matching the vertex. More specifically, two sides intersecting and perpendicular
to each other of the mark 24 are substantially matched with respective sides of the
label 18 defining the vertex.
[0045] The label 18 of Figure 4 is, however, equipped with a centering mark 33 comprising
two marks 25 and 26 printed with an elongate shape, perpendicular to each other and
positioned near to a vertex of the label 18 (at the top left in Figure 4) lying parallel
to the respective sides of the label 18 intersecting and defining the vertex. The
mark 25 in Figure 4 lies horizontally, whilst the mark 26 lies vertically, and a side
of each of the marks 25, 26 is substantially matching with a respective side of the
label 18 defining the above-mentioned vertex.
[0046] The label 18 of Figure 5 is equipped with a centering mark 33 having substantially
an "L" shape, comprising two marks 27 and 28 printed with an elongate shape, perpendicular
to each other and concurrent at a vertex of the label 18 (at the top left in Figure
5) lying parallel to the respective sides of the label 18 intersecting and defining
the vertex. The mark 27 in Figure 5 lies horizontally, whilst the mark 28 lies vertically,
and a side of each of the marks 27, 28 is substantially matching with a respective
side of the label 18 defining the above-mentioned vertex, so that the sides of the
marks 27, 28 are perpendicular to each other, and respective ends of the sides of
the marks 27, 28 coincide.
[0047] The label 18 of Figure 6 is equipped with a centering mark 33 comprising two marks
29 and 30 printed with an elongate shape, perpendicular to each other and positioned
near to respective vertices of the label 18 (positioned on the left, at the top and
bottom, respectively, in Figure 6) lying parallel to respective sides of the label
18 intersecting and defining a vertex positioned at the top left in Figure 6. A side
of each of the marks 29, 30 is substantially matching with a respective side of the
label 18 concurrent towards the vertex.
[0048] As shown in figure 7, the labels 18 are obtained by cutting and separating, that
is to say, removing, from a web 31, on which are printed, relative to each label 18,
the centring marks 33 comprising the above-mentioned marks 24-30 (Figure 7 shows marks
25 and 26).
[0049] As illustrated, the marks 24-30 are printed across sides or edge zones of the label
18, in such a way as to be present in the label 18 in the ways described with reference
to Figures 3 to 6, and to also touch portions of the web 31 close to the sides or
edge zones. In other words, before separating the labels 18 from the web 31, the web
31 is printed, relative to each label 18, with at least one centering mark 24-30 positioned
across two sides of the label 18 perpendicular to each other, in such a way as to
touch, in the proximity of each of the sides, parts of the web 31 both inside and
outside the label 18. This provides the certainty that, after separating the labels
18 from the web 31, the relative marks 24-30 in each label 18 are delimited by respective
sides or edge zones of the label 18, whatever the position tolerances with which the
marks 24-30 have been printed on the web 31 (obviously, it is assumed that these tolerances
are not such as to shift the printing of the marks 24-30 completely outside or inside
the labels 18).
[0050] The operating method described makes it possible to have with certainty the marks
24-30 of the labels 18 removed from the adjacent web 31 with two sides or edge zones
of the label 18 perpendicular to each other, and therefore allows a reading of maximum
precision to be performed of the position of these adjacent zones or edges of the
marks 24-30, substantially coinciding with respective edges of the respective label
18, using control devices of the photocell optical type, shown schematically in the
form of arrows in Figures 3-6 and denoted by the reference numeral 32. Obviously,
the fact of performing the position control for each label 18 in two directions (those
of the arrows 32 of each of the Figures 3 to 6) perpendicular to each other and perpendicular
to two edges perpendicular to each other of the labels 18 allows a complete check
to be made of the position of the labels 18 on the relative plane on which they lie.
[0051] During production of the cigarettes packet 1, each label 18 is firstly separated
from the web 31 and connected to the sheet material which will form the inner wrapper
3, and then the sheet material is wrapped around a group 15 of cigarettes 16, with
subsequent inclusion in the outer container 2. For this reason, the described position
checking of the label 18 by optical reading of the marks 24-30 may be performed, as
preferred, either when the sheet material which will form the inner wrapper 3 is still
laid out on a plane, that is to say, not yet folded to form the wrapper 3, or on the
wrappers 3 already formed and not yet enclosed in the respective outer containers
2.
[0052] It should be noted that, if preferred, the marks 24-30 might be printed on the label
18 using invisible ink, that is to say, not visible by the human eye with sources
of light in the field of vision. More specifically, it is preferable that the ink
used is visible under lighting within the ultraviolet or infrared range. The advantage,
in this case, is both that of making the mark invisible and also preventing that the
sensitivity of the control is influenced by the background colour, that is to say,
the colour of the sheet material.
1. A method for checking the position of an adhesive label on a sheet material, the sheet
material forming or being designed to form a wrapper (3) which is part of a cigarette
packet (1), and the label (18) being applied to the sheet material after separation
of the label from a web (31); the method being characterized in that it comprises, before separation of the label (18) from the web (31), the printing
on the label (18) of at least a centering mark (33) extending as far as the outer
perimeter of the label (18); the check of the position of the label (18) on the sheet
material occurring through the detection of the position of the part of the perimeter
of the label (18) on which the centering mark (33) extends.
2. The method according to claim 1, characterized in that, during the printing process, the centering mark (33) of the label (18) projects
onto the web (31) beyond the outer perimeter of the label (18).
3. The method according to claim 1 or 2, characterized in that the centering mark (33) of the label (18) comprises at least one perimetric edge
coinciding with a respective perimetric edge of the label (18).
4. The method according to any one of the preceding claims 1 to 3, characterized in that the centering mark (33) comprises a first and a second centering eye mark (24 to
30), said eye marks extending, respectively, as far as a first and a second perimetric
edge of the label (18); said first and second perimetric edges starting from the same
vertex of the label (18).
5. The method according to any one of the preceding claims 1 to 3, characterized in that the centering mark (33) comprises a first and a second centering eye mark (24 to
30), said eye marks extending, respectively, as far as a first and a second perimetric
edge of the label (18); said first and second perimetric edges being substantially
orthogonal relative to one another.
6. The method according to any one of the preceding claims 1 to 3, characterized in that the centering mark (33) comprises a single centering eye mark extending as far as
a vertex of the label (18) formed by a first and a second perimetric edge of the label
(18).
7. The method according to claim 6, characterized in that said first and second perimetric edges being substantially orthogonal relative to
one another.
8. The method according to claim 6 or 7, characterized in that said single centering eye mark has a substantially triangular shape.
9. The method according to claim 6 or 7, characterized in that said single centering eye mark is substantially "L"-shaped.
10. The method according to any one of claims 1 to 9, characterized in that the centering mark (33) is printed using invisible ink.
11. The method according to any one of claims 1 to 9, characterized in that the centering mark (33) is printed using an ink which is visible under lighting within
the ultraviolet or infrared range.
1. Verfahren zur Überprüfung der Position eines Klebeetiketts auf einem Blattmaterial,
wobei das Blattmaterial eine Umhüllung (3), die Teil einer Zigarettenschachtel (1)
ist, und das Etikett (18), das auf das Blattmaterial nach Trennung des Etiketts von
einer Bahn (31) aufgebracht wird, formt oder ausgelegt ist, sie/es zu formen; wobei
das Verfahren dadurch gekennzeichnet ist, dass es vor der Trennung des Etiketts (18) von der Bahn (31) das Bedrucken mindestens
einer Zentriermarkierung (33) auf dem Etikett (18) umfasst, die sich bis zum Außenumfang
des Etiketts (18) erstreckt; wobei die Überprüfung der Position des Etiketts (18)
auf dem Blattmaterial durch die Erfassung der Position des Teils des Umfangs des Etiketts
(18) erfolgt, auf dem sich die Zentriermarkierung (33) erstreckt.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass während des Druckvorgangs die Zentriermarkierung (33) des Etiketts (18) über den
Außenumfang des Etiketts (18) hinaus auf die Bahn (31) ragt.
3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Zentriermarkierung (33) des Etiketts (18) mindestens eine umlaufende Kante umfasst,
die mit einer jeweiligen umlaufenden Kante des Etiketts (18) zusammenfällt.
4. Verfahren nach einem der vorhergehenden Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Zentriermarkierung (33) eine erste und eine zweite Zentrierlesemarkierung (24
bis 30) umfasst, wobei sich die Lesemarkierungen jeweils bis zu einer ersten und einer
zweiten umlaufenden Kante des Etiketts (18) erstrecken; wobei die erste und die zweite
umlaufende Kante vom gleichen Scheitelpunkt des Etiketts (18) ausgehen.
5. Verfahren nach einem der vorhergehenden Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Zentriermarkierung (33) eine erste und eine zweite Zentrierlesemarkierung (24
bis 30) umfasst, wobei sich die Lesemarkierungen jeweils bis zu einer ersten und einer
zweiten umlaufenden Kante des Etiketts (18) erstrecken; wobei die erste und die zweite
umlaufende Kante im Wesentlichen orthogonal zueinander sind.
6. Verfahren nach einem der vorhergehenden Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Zentriermarkierung (33) eine einzelne Zentrierlesemarkierung umfasst, die sich
bis zu einem Scheitelpunkt des Etiketts (18) erstreckt, das durch eine erste und eine
zweite umlaufende Kante des Etiketts (18) geformt ist.
7. Verfahren nach Anspruch 6, wobei die erste und die zweite umlaufende Kante im Wesentlichen
orthogonal zueinander sind.
8. Verfahren nach Anspruch 6 oder 7, dadurch gekennzeichnet, dass die einzelne Zentrierlesemarkierung eine im Wesentlichen dreieckige Form aufweist.
9. Verfahren nach Anspruch 6 oder 7, dadurch gekennzeichnet, dass die einzelne Zentrierlesemarkierung im Wesentlichen "L" -förmig ist.
10. Verfahren nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass die Zentriermarkierung (33) unter Verwendung unsichtbarer Tinte gedruckt wird.
11. Verfahren nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass die Zentriermarkierung (33) unter Verwendung einer Tinte gedruckt wird, die unter
Beleuchtung im ultravioletten oder infraroten Bereich sichtbar ist.
1. Procédé pour vérifier la position d'une étiquette adhésive sur un matériau en feuille,
le matériau en feuille formant ou étant conçu pour former un emballage (3) faisant
partie d'un paquet de cigarettes (1), et l'étiquette (18) étant appliquée sur le matériau
en feuille après séparation de l'étiquette d'une bande (31) ; le procédé étant caractérisé en ce qu'il comprend, avant la séparation de l'étiquette (18) de la bande (31), l'impression
sur l'étiquette (18) d'au moins un repère de centrage (33) se prolongeant jusqu'au
périmètre extérieur de l'étiquette (18) ; la vérification de la position de l'étiquette
(18) sur le matériau en feuille s'effectuant à travers la détection de la position
de la partie du périmètre de l'étiquette (18) sur laquelle se prolonge le repère de
centrage (33) .
2. Procédé selon la revendication 1, caractérisé en ce que, pendant le processus d'impression, le repère de centrage (33) de l'étiquette (18)
dépasse sur la bande (31) au-delà du périmètre extérieur de l'étiquette (18) .
3. Procédé selon la revendication 1 ou 2, caractérisé en ce que la repère de centrage (33) de l'étiquette (18) comprend au moins un bord périphérique
coïncidant avec un bord périphérique respectif de l'étiquette (18) .
4. Procédé selon l'une quelconque des revendications 1 à 3, caractérisé en ce que le repère de centrage (33) comprend un premier et un second repère de centrage visuel
(24 à 30), lesdits repères visuels se prolongeant, respectivement, jusqu'à un premier
et un second bord périphérique de l'étiquette (18) ; lesdits premier et second bords
périphériques partant du même sommet de l'étiquette (18).
5. Procédé selon l'une quelconque des revendications précédentes 1 à 3, caractérisé en ce que le repère de centrage (33) comprend un premier et un second repère de centrage visuel
(24 à 30), lesdits repères visuels se prolongeant, respectivement, jusqu'à un premier
et un second bord périphérique de l'étiquette (18) ; lesdits premier et second bords
périphériques étant substantiellement orthogonaux l'un par rapport à l'autre.
6. Procédé selon l'une quelconque des revendications précédentes 1 à 3, caractérisé en ce que le repère de centrage (33) comprend un repère de centrage visuel unique se prolongeant
jusqu'à un sommet de l'étiquette (18) formé par un premier et un second bord périphérique
de l'étiquette (18).
7. Procédé selon la revendication 6, caractérisé en ce que lesdits premier et second bords périphériques sont substantiellement orthogonaux
l'un par rapport à l'autre.
8. Procédé selon la revendication 6 ou 7, caractérisé en ce que ledit repère de centrage visuel unique a une forme substantiellement triangulaire.
9. Procédé selon la revendication 6 ou 7, caractérisé en ce que ledit repère de centrage visuel unique est substantiellement en forme de « L ».
10. Procédé selon l'une quelconque des revendications 1 à 9, caractérisé en ce que le repère de centrage (33) est imprimé en utilisant une encre invisible.
11. Procédé selon l'une quelconque des revendications 1 à 9, caractérisé en ce que le repère de centrage (33) est imprimé en utilisant une encre qui est visible sous
un éclairage dans la gamme des ultraviolets ou des infrarouges.