METHOD OF FORMING SCORE LINES ON A BLANK

Description

Technical Field

[0001] The present invention relates to a method of forming score lines on a blank, a method of manufacturing a package using same, and a package.

Background Art

[0002] Generally, packages of this type are called hinged-lid packages. The hinged-lid package is cuboidal in shape and has four longitudinal angular edges. The package with angular edges does not fit comfortably in the hand of a user who holds the package. The package with rounded edges in place of angular edges is therefore preferable. A blank (plastic sheet) for forming a package with rounded edges is known (see patent document 1, for example).

[0003] According to patent document 1, score lines are formed on the blank by pressing blades against the blank, and the resulting score-lined areas are bent into rounded edges.

[0004] The forming of score lines in the manner shown in patent document 1, however, stretches the score-lined surface, so that the blank warps in the manner that the score-lined surface bulges. Such warped blank is not allowed to be supplied to a packaging machine to package items, such as cigarettes, in the blank. If the package is formed using such warped blank, the inner side of each rounded edge, namely the back side of each score-lined area stores the power to return to the original state, so that the whole package is swollen and distorted. Such distorted package is regarded as poor-quality and thus cannot be put on the market.

[0005] Furthermore patent document 2 describes indentations that are formed on a plastic plate by application of heat for forming a plastic container.

[0006] Furthermore patent document 3 describes a score line 48 formed as a single fold line on a blank (plastic plate) for forming a case for containing recording media.

Prior Art Documents

Patent Documents

[0007] 

Patent Document 1: JP 2004-98586 A;

Patent Document 2: US 3 907 193 A;

Patent Document 3: JP H05 8327 A

Summary of the Invention

Problems to be solved by the Invention

[0008] The present invention intends to provide a method of forming score lines on a blank in a manner not causing deformation, such as warping, of the whole blank so that the score-lined blank can be steadily supplied to a packaging machine and formed into a package with rounded edges without distortion.

Means for Solving the Problems

[0009] The present invention provides a method of forming score lines on a blank, comprising the features of claim 1.

[0010] Desirably, the box to be formed comprises a box-shaped container open at the top and a box-shaped lid connected to a top edge of the container functioning as a hinge to open and close the container; the blank comprises a main section for forming the container, extending in one direction, and a sub-section for forming the lid, connected to an edge of the main section which is to form the hinge; the main section includes a front main panel, a bottom panel and a rear main panel for forming a front wall, a bottom wall and a rear wall of the container, aligned in the direction and delimited by transverse fold lines, and outer and inner side main flaps for forming an outer and an inner layer of each side wall of the container, connected to either side of the front main panel and of the rear main panel; the sub-section includes a rear sub-panel, a top panel and a front sub-panel for forming a rear wall, a top wall and a front wall of the lid, aligned in the direction and delimited by transverse fold lines, and inner and outer side sub-flaps for forming an inner and an outer layer of each side wall of the lid, connected to either side of the rear sub-panel and of the front sub-panel; and the score line forming areas are provided between the front main panel and the outer side main flap, between the rear main panel and the inner side main flap, between the rear sub-panel and the inner side sub-flap, and between the front sub-panel and the outer side sub-flap, respectively.

[0011] Desirably, in the blank forming step, a printed layer for providing information about items to be contained in the box in a manner recognizable from the score line forming area side is formed on a side of the blank opposite to the score line forming area side.

[0012] Desirably, the blank is made of polyethylene terephthalate.

Advantageous Effects of the Invention

[0013] The method according to the present invention comprises a blank forming step of forming a blank able to be formed into a box by folding, and a score line forming step of forming score lines in areas of the blank which are to be bent to form outer edges of the box, to extend in a direction in which the outer edges should extend, and in the score line forming step, the score lines are formed in a manner causing grooves to be produced on a back side of each score line forming area, along the score lines, through plastic deformation. The score lines are thus formed on one side of the blank which is to form the outer surface of the box, and the forming of the score lines on one side of the blank simultaneously and automatically causes the production of grooves on the other side of the blank through plastic deformation. The blank therefore does not undergo tensile stress pulling on the blank to either side of each groove, and thus, does not undergo warping as a whole. Since the blank retains its sheet shape, it can be steadily supplied to a packaging machine. From the blank prevented from warping, a package can be formed without distortion.

[0014] When the blank is configured to have a main section and a sub-section so as to be applied to a cigarette package (so-called hinged-lid package), the resulting cigarette package has rounded edges formed by bending the score-lined areas. Such package fits comfortably in the hand.

[0015] In the blank forming step, a printed layer is formed on the side of the blank opposite to the score line forming area side, which means that the score lines are not formed directly on the printed layer.

[0016] When made of polyethylene terephthalate, the blank is easy to handle and easy to form score lines thereon.

[0017] A cigarette package with rounded edges can be produced from the blank having undergone the score line forming step, by bending the blank with the score-lined surface outside, thereby forming the blank into a box, where each score-lined area can be bent into a rounded edge utilizing the score lines. The cigarette package with rounded edges fits comfortably in the hand.

Brief Description of the Drawings

[0018] 

FIG. 1 is a schematic diagram showing a cigarette package according to the present invention in a closed state.

FIG. 2 is a schematic diagram showing the package shown in FIG. 1, in an open state.

FIG. 3 is a schematic diagram showing a blank to which score lines forming method according to the present invention has been applied.

FIG. 4 is a schematic diagram for explaining the process of forming score lines.

FIG. 5 is a schematic diagram for explaining the process of forming score lines.

FIG. 6 is a schematic diagram showing another blank to which the score lines forming method according to the present invention has been applied.

FIG. 7 is a schematic diagram showing an inner frame to which the score lines forming method according to the present invention has been applied.

Mode for Carrying out the Invention

[0019] A cigarette package (box) 1 shown in FIG. 1 is, as a whole, cuboidal in shape and covered with a transparent film (not shown). The covering film has a tear tape. The package is partly exposed by opening the covering film along the tear tape. The cigarette package 1 includes a container 2. The container 2 is open at the top. The open top is closed with a lid 6. The lid 6 is connected to the rear top edge of the container which functions as a hinge 4. The lid is therefore able to be rotated on the hinge 4 to open or close the container. More specifically, as seen from FIG. 2, the container 2 has inclined top edges. The container 2 has further a U-shaped inner frame 10. The inner frame 10 is arranged to project from the top of the container 2 to define the top opening 12 of the container 2. The inner frame 10 has an access opening 14 in the front wall thereof. The access opening 14 has an approximately U shape.

[0020] The lid 6 is in the shape of a box whose bottom edges define an inclined opening. The lid 6 is designed to close the top opening 12 in the manner that the lid 6 lies over the projecting part of the inner frame 10. In the closed state, the bottom edges of the lid 6 meet the top edges of the container 2. While in common packages, the container has four longitudinal angular edges, the container 2 of the present invention has rounded edges 16 in place of angular edges. In the transverse cross-section of the container 2, each rounded edge 16 shows a circular arc shape. The lid 6 has similar rounded edges 18 corresponding to the rounded edges 16, respectively. As seen from FIG. 1, in the container closed with the lid 6, each rounded edge 16 is in alignment with the corresponding rounded edge 18 so that they constitute a longitudinal edge of the package 1. As will be described later, the inner frame 10 has two rounded edges 24.

[0021] To obtain the cigarette package 1 with rounded edges, the present invention provides a manufacturing method described below.

[0022] The cigarette package 1 is formed by folding a sheet-shaped blank 3 (see FIG. 3). The blank 3 has transverse fold lines 5 formed to make the blank 3 easy to fold at intended locations. The blank 3 is, in advance, cut into a desired shape so that the blank 3 can be formed into the intended box shape by folding. The blank 3 is formed by a known blank forming process. It is to be noted that in the blank forming step, fold lines for forming the longitudinal edges (referred to as "longitudinal fold lines") are not formed.

[0023] In the present invention, a score line forming step is performed, in which score lines 7 are formed in each score line forming area 8 of the blank 3, which is an area to be folded into a longitudinal edge of the box 1, that is, an area in which normally a longitudinal fold line is formed, to extend in the direction in which the edge should extend. The score lines 7 are formed on that side of the blank which is to form the outer surface of the box 1. In other words, the score lines forming areas 8 are on that side of the blank which is to form the outer side of the box, so that the score lines 7 are formed only on that side of the blank.

[0024] In the score line forming step, the forming of the score lines 7 causes grooves 9 (see FIG. 5) to be produced on the back side of each score line forming area, along the score lines 7, through plastic deformation. In other words, although the score lines 7 are formed only on that side of the blank 3 which is to form the outer surface of the box 1 as mentioned above, the forming of the score liens 7 on one side of the blank simultaneously and automatically causes the production of grooves 9 on the other side of the blank through plastic deformation. Such production of the grooves 9 is brought on by using a cutting device 11 as shown in FIG. 4. The cutting device 11 is a rotary die cutter having ten parallel blades 13 at approximately 0.8mm intervals, for example. The score lines 7 and grooves 9 are formed by pressing each score line forming area 8 with the blades 13. Specifically, score lines 7 are formed on one side of the blank 3 by pressing the score line forming area 8 with the blades 13. During this step, when the blades penetrate to a certain depth, the blank is pulled on to either side of each score line 7 and plastically deformed. Grooves 9 are thus automatically formed on the back side of the score line forming area 8, at positions corresponding to the bottoms 7a of the score lines 7. The grooves 9 extend along the score lines 7 as mentioned above. More specifically, the grooves 9 develop along the respective score lines 7 in a manner corresponding to the respective score lines 7. The depth D of the score lines 7 is 134.74µm in the case that the blank is 307.97µm thick, for example. The blank 3 with the groove 8 produced this way does not undergo tensile stress pulling on the blank 3 to either side of each groove 9, and thus, does not undergo warping as a whole. The blank 3 thus retains its sheet shape, and can be steadily supplied to a packaging machine. From the blank thus prevented from warping, the package 1 can be formed without distortion.

[0025] During the blank forming step, a printed layer 15 is formed on the side of the blank opposite to the score line forming area side to provide information about items to be contained in the box 1 in a manner recognizable from the score line forming area side (outer surface of the formed box 1). Cutting work on the printed layer 15 should be avoided as much as possible. Since the printed layer 15 is on the side of the blank opposite to the score line forming area 8 side, score lines 7 are not formed directly on the printed layer 15. When the blank 3 is made of polyethylene terephthalate (PET), the blank 3 is easy to handle and easy to form score lines 7 thereon.

[0026] The blank 3 for forming the cigarette package 1 has the following configuration:
The blank 3 comprises a main section 19 for forming the container 2, extending in one direction (bottom-to-top direction in FIG. 3), and a sub-section 20 for forming the lid 6, connected to an edge of the main section 19 which is to form the hinge 4. The main section 19 includes a front main panel 21, a bottom panel 22 and a rear main panel 23 for forming a front wall 21a, a bottom wall (not shown) and a rear wall 23a of the container 2, aligned in the aforementioned direction and delimited by transverse fold lines 5. Further, outer and inner side main flaps 25, 26 for forming an outer and an inner layer of each side wall of the container 2 are connected to either side of the front main panel 21 and of the rear main panel 23. The main flaps 25, 26 are connected to their associated main panels 21, 23 by a score line forming area 8. To each inner side main flap 26 is connected an inner bottom flap 33 by a transverse fold line 5. The inner bottom flaps 33 are members for reinforcing the bottom panel 22, and form an inner layer of the bottom wall of the container 2.

[0027] The sub-section 20 includes a rear sub-panel 27, a top panel 28 and a front sub-panel 29 for forming a rear wall 27a, a top wall 28a and a front wall 29a of the lid 6, aligned in the aforementioned direction and delimited by transverse fold lines 5. Inner and outer side sub-flaps 30, 31 for forming an inner and an outer layer of each side wall of the lid 6 are connected to either side of the rear sub-panel 27 and of the front sub-panel 29. The sub-flaps 30, 31 are connected to their associated sub-panels 27, 29 by a score line forming area 8. To each inner side sub-flap 30 is connected an inner top flap 32 by a transverse fold line 5. The inner top flaps 32 are members for reinforcing the top panel 28, and form an inner layer of the top wall of the lid 6.

[0028] The score line forming area 8 is thus provided between the front main panel 21 and the outer side main flap 25, between the rear main panel 23 and the inner side main flap 26, between the rear sub-panel 27 and the inner side sub-flap 30, and between the front sub-panel 29 and the outer side sub-flap 31, each, so that the longitudinal edges of the box 1 are all formed from the score line forming areas 8. The score lines 7 are formed in each score line forming area 8 as described above, and the resulting score-lined areas are each bent into a rounded edge. As a result, the box 1 has longitudinal edges 16, 18 each formed as a rounded edge.

[0029] After the score line forming step, the blank is formed into the box 1 by folding the blank with the surface with score lines 7 outside, where each score line forming area 8 is bent utilizing the score lines 7 so that the resulting cigarette package 1 has rounded edges 16, 18. The package 1 with the rounded edges is easy to hold and fits comfortably in the hand. While FIGS. 1 and 2 show a hinged lid package to which the present invention is applied, the present invention is applicable to a tongue lid package in a similar manner.

[0030] As shown in FIG. 6, taking into consideration the restoring force opposing the bending when the blank 3 is formed into the box 1 by folding or bending, the score line forming areas 8 may include non-forming parts 34 in which the score lines 7 are not formed. For example, the score line forming area 8 provided between the rear main panel 23 and each inner side main flap 26 may include a triangular non-forming part 34a at the bottom panel 22-side end. The score line forming area 8 provided between the rear sub-panel 27 and each inner side sub-flap 30 may include a triangular non-forming part 34b at the top panel 28-side end, for example. The score line forming area 8 provided between the front main panel 21 and each outer side main flap 25 may include a rectangular non-forming part 34c at the bottom panel 22-side end, for example.

[0031] As shown in FIG. 7, the score line forming method according to the present invention is applied also to the inner frame 10. Specifically, a score line forming area 8 is provided between the main panel 17 and each flap 35, and score lines 7 are formed in each score line forming area 8 in the same way as described with respect to the blank 3. As a result, the inner frame 10 has rounded edges 24.

Explanation of Reference Signs

[0032] 

1

Cigarette package (box)

2

Container

3

Blank

4

Hinge

5

Transverse fold line

6

Lid

7

Score lines

8

Score line forming area

9

Groove

10

Inner frame

11

Cutting device

12

Top opening

13

Blade

14

Access opening

15

Printed layer

16

Rounded edge

17

Main panel

18

Rounded edge

19

Main section

20

Sub-section

21

Front panel

22

Bottom panel

23

Rear panel

24

Rounded edge

25

Outer side flap

26

Inner side flap

27

Front sub-panel

28

Top panel

29

Rear sub-panel

30

Inner side sub-flap

31

Outer side sub-flap

32

Inner top flap

33

Inner bottom flap

34

Non-forming part

35

Flap

Claims

1. A method of forming score lines on a blank, comprising steps of:

forming a sheet-shaped resin blank (3) able to be formed into a box (1), the box (1) including outer longitudinal edges which are bent into rounded edges (16, 18, 24) and extend in a longitudinal direction of the box (1), and outer transverse edges perpendicular to the outer longitudinal edges, wherein said blank forming step includes a process of forming transverse fold lines (5) to be bent to form the outer transverse edges and a process of cutting out for said blank (3); and

forming a plurality of score lines (7) in score line forming areas (8) of said blank which are to be bent to form the outer longitudinal edges of the box, to extend in a direction in which the rounded edges (16, 18, 24) should extend,

characterized in that said score line forming step is performed after said blank forming step has completed, and

in said score line forming step, said score lines (7) are formed in a manner causing a plurality of grooves (9) to be produced on a back side of each score line forming area (8), parallel to said score lines (7), through plastic deformation.

2. The method according to claim 1, characterized in that the plurality of grooves (9) are formed along the respective score lines (7) in a manner corresponding to the respective score lines (7).

3. The method according to claim 1, characterized in that:

the box (1) to be formed comprises a box-shaped container (2) having an open end (12), and a box-shaped lid (6) connected to an edge of the open end (12) of the container via a hinge (4) to open and close the open end (12) of the container,

said blank (3) comprises a main section (19) for forming the container (2), extending in one direction, and a sub-section (20) for forming the lid (6), connected to an edge of the main section (19) via the hinge (4),

the main section (19) includes a front main panel (21), a bottom panel (22) and a rear main panel (23) for forming a front wall, a bottom wall and a rear wall of the container, aligned in said one direction and delimited by the transverse fold lines (5), and outer and inner side main flaps (25, 26) for forming an outer and an inner layer of each side wall of the container (2), connected to either side of the front main panel (21) and of the rear main panel (23),

the sub-section (20) includes a rear sub-panel (29), a top panel (28) and a front sub-panel (27) for forming a rear wall, a top wall and a front wall of the lid (6), aligned in said one direction and delimited by transverse fold lines (5), and inner and outer side sub-flaps (30, 31) for forming an inner and an outer layer of each side wall of the lid (6), connected to either side of the rear sub-panel (29) and of the front sub-panel (27), and

said score line forming areas (8) are provided between the front main panel (21) and the outer side main flap (25), between the rear main panel (23) and the inner side main flap (26), between the rear sub-panel (29) and the inner side sub-flap (30), and between the front sub-panel (27) and the outer side sub-flap (31), respectively.

4. The method according to claim 1, characterized in that in said blank forming step, a printed layer (15) for providing information about items to be contained in the box (1) in a manner recognizable from the score line forming area side is formed on a side of said blank opposite to said score line forming area side.

5. The method according to claim 1, characterized in that said blank (3) is made of polyethylene terephthalate.

6. A method of manufacturing a package using the score line forming method according to claim 1, characterized in that after said score line forming step, said blank (3) is formed into the box (1) having the rounded edges (16, 18, 24) as the outer edges thereof, by folding and bending said blank with the score-lined surface outside.

Ansprüche

1. Verfahren zum Bilden von Kerblinien auf einem Rohling, umfassend die folgenden Schritte:

Bilden eines flächenförmigen Harzrohlings (3), der zu einer Schachtel (1) gebildet werden kann, wobei die Schachtel (1) äußere Längskanten, die zu abgerundeten Kanten (16, 18, 24) gebogen werden und sich in einer Längsrichtung der Schachtel (1) erstrecken, und äußere Querkanten senkrecht zu den äußeren Längskanten aufweist, wobei der Rohlingbildungsschritt einen Vorgang zum Bilden von Querfaltlinien (5), die zu biegen sind, um die äußeren Querkanten zu bilden, und einen Vorgang zum Ausschneiden des Rohlings (3) umfasst; und

Bilden von mehreren Kerblinien (7) in Kerblinienbildungsbereichen (8) des Rohlings, die zu biegen sind, um die äußeren Längskanten der Schachtel zu bilden, um sich in eine Richtung zu erstrecken, in die sich die abgerundeten Kanten (16, 18, 24) erstrecken sollten,

dadurch gekennzeichnet, dass der Kerblinienbildungsschritt durchgeführt wird, nachdem der Rohlingbildungsschritt abgeschlossen ist, und

die Kerblinien (7) in dem Kerblinienbildungsschritt in einer Weise gebildet werden, die verursacht, dass mehrere Nuten (9) auf einer Rückseite von jedem Kerblinienbildungsbereich (8), parallel zu den Kerblinien (7), durch plastische Verformung hergestellt werden.

2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die mehreren Nuten (9) entlang der jeweiligen Kerblinien (7) in einer Weise entsprechend den jeweiligen Kerblinien (7) gebildet werden.

3. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass:

die zu bildende Schachtel (1) einen schachtelförmigen Behälter (2) mit einem offenen Ende (12) und einem schachtelförmigen Deckel (6), der mit einer Kante des offenen Endes (12) des Behälters über einen Falz (4) verbunden ist, um das offene Ende (12) des Behälters zu öffnen und zu schließen, umfasst,

der Rohling (3) einen Hauptabschnitt (19) zum Bilden des Behälters (2), der sich in eine Richtung erstreckt, und

einen untergeordneten Abschnitt (20) zum Bilden des Deckels (6), der mit einer Kante des Hauptabschnitts (19) über den Falz (4) verbunden ist, umfasst,

der Hauptabschnitt (19) eine vordere Hauptplatte (21), eine Bodenplatte (22) und eine hintere Hauptplatte (23) zum Bilden einer vorderen Wand, einer Bodenwand und einer hinteren Wand des Behälters, die in der einen Richtung ausgerichtet und durch die Querfaltlinien (5) begrenzt sind, und äußere und innere Seitenhauptklappen (25, 26) zum Bilden einer äußeren und einer inneren Schicht von jeder Seitenwand des Behälters (2), die mit jeder Seite der vorderen Hauptplatte (21) und der hinteren Hauptplatte (23) verbunden sind, aufweist,

der untergeordnete Abschnitt (20) eine hintere untergeordnete Platte (29), eine Deckplatte (28) und eine vordere untergeordnete Platte (27) zum Bilden einer hinteren Wand, einer Deckwand und einer vorderen Wand des Deckels (6), die in der einen Richtung ausgerichtet und durch die Querfaltlinien (5) begrenzt sind, und innere und äußere untergeordnete Seitenklappen (30, 31) zum Bilden einer inneren und einer äußeren Schicht von jeder Seitenwand des Deckels (6), die mit jeder Seite der hinteren untergeordneten Platte (29) und der vorderen untergeordneten Platte (27) verbunden sind, aufweist, und

die Kerblinienbildungsbereiche (8) jeweils zwischen der vorderen Hauptplatte (21) und der äußeren Seitenhauptklappe (25), zwischen der hinteren Hauptplatte (23) und der innere Seitenhauptklappe (26), zwischen der hinteren untergeordneten Platte (29) und der inneren untergeordneten Seitenklappe (30) und zwischen der vorderen untergeordneten Platte (27) und der äußeren untergeordneten Seitenklappe (31) bereitgestellt werden.

4. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass in dem Rohlingbildungsschritt eine gedruckte Schicht (15) zum Bereitstellen von Informationen über in der Schachtel (1) zu beinhaltende Gegenstände in einer von der Kerblinienbildungsbereichsseite aus zu erkennenden Weise auf einer Seite des Rohlings gegenüber der Kerblinienbildungsbereichsseite gebildet wird.

5. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der Rohling (3) aus Polyethylen-Terephthalat hergestellt ist.

6. Verfahren zum Herstellen einer Verpackung unter Verwendung des Kerblinienbildungsverfahrens nach Anspruch 1, dadurch gekennzeichnet, dass der Rohling (3) nach dem Kerblinienbildungsschritt zu der Schachtel (1) mit den abgerundeten Kanten (16, 18, 24) als die äußeren Kanten davon durch Falten und Biegen des Rohlings mit der mit Kerblinien versehenen Flächenaußenseite gebildet wird.

Revendications

1. Procédé de formation de lignes de rainage sur un flan, comprenant les étapes consistant à :

former un flan en résine en forme de feuille (3) apte à être façonné en une boîte (1), la boîte (1) présentant des bords longitudinaux extérieurs qui sont cintrés pour former des bords arrondis (16, 18, 24) et qui s'étendent dans une direction longitudinale de la boîte (1), et des bords transversaux extérieurs perpendiculaires aux bords longitudinaux extérieurs, dans lequel ladite étape de formation de flan inclut un processus consistant à former des lignes transversales de pliage (5) à cintrer pour former les bords transversaux extérieurs et un processus consistant à découper ledit flan (3) ; et

former une pluralité de lignes de rainage (7) dans des zones de formation de lignes de rainage (8) dudit flan, qui doivent être cintrées pour former les bords longitudinaux extérieurs de la boîte, pour s'étendre dans une direction dans laquelle doivent s'étendre les bords arrondis (16, 18, 24) ,

caractérisé en ce que ladite étape de formation de lignes de rainage est réalisée après que ladite étape de formation de flan a été achevée, et

dans ladite étape de formation de lignes de rainage, lesdites lignes de rainage (7) sont formées de manière à produire une pluralité de rainures (9) sur une face arrière de chaque zone de formation de lignes de rainage (8), parallèlement auxdites lignes de rainage (7), par déformation plastique.

2. Procédé selon la revendication 1, caractérisé en ce que la pluralité de rainures (9) est formée le long des lignes de rainage respectives (7) de manière à correspondre aux lignes de rainage respectives (7).

3. Procédé selon la revendication 1, caractérisé en ce que :

la boîte (1) à façonner comprend un contenant en forme de boîte (2) présentant une extrémité ouverte (12), et un couvercle en forme de boîte (6) relié à un bord de l'extrémité ouverte (12) du contenant par l'intermédiaire d'une charnière (4) pour ouvrir et fermer l'extrémité ouverte (12) du contenant,

ledit flan (3) comprend une section principale (19) destinée à former le contenant (2), s'étendant dans une direction, et une section secondaire (20) destinée à former le couvercle (6), reliée à un bord de la section principale (19) par l'intermédiaire de la charnière (4),

la section principale (19) comporte un panneau principal avant (21), un panneau inférieur (22) et un panneau principal arrière (23) destinés à former une paroi avant, une paroi inférieure et une paroi arrière du contenant, alignés dans ladite direction et délimités par les lignes transversales de pliage (5), et des rabats principaux latéraux extérieurs et intérieurs (25, 26) destinés à former une couche extérieure et intérieure de chaque paroi latérale du contenant (2), reliés à chaque côté du panneau principal avant (21) et du panneau principal arrière (23),

la section secondaire (20) comporte un panneau secondaire arrière (29), un panneau supérieur (28) et un panneau secondaire avant (27) destinés à former une paroi arrière, une paroi supérieure et une paroi avant du couvercle (6), alignés dans ladite direction et délimités par les lignes transversales de pliage (5), et des rabats secondaires latéraux intérieurs et extérieurs (30, 31) destinés à former une couche intérieure et extérieure de chaque paroi latérale du couvercle (6), reliés à chaque côté du panneau secondaire arrière (29) et du panneau secondaire avant (27),

lesdites zones de formation de lignes de rainage (8) se situent entre le panneau principal avant (21) et le rabat principal latéral extérieur (25), entre le panneau principal arrière (23) et le rabat principal latéral intérieur (26), entre le panneau secondaire arrière (29) et le rabat secondaire latéral intérieur (30), et entre le panneau secondaire avant (27) et le rabat secondaire latéral extérieur (31), respectivement.

4. Procédé selon la revendication 1, caractérisé en ce que dans ladite étape de formation de flan, une couche imprimée (15) destinée à fournir des informations au sujet d'articles devant être contenus dans la boîte (1) de manière reconnaissable depuis le côté de la zone de formation de lignes de rainage, est formée sur un côté dudit flan opposé audit côté de la zone de formation de lignes de rainage.

5. Procédé selon la revendication 1, caractérisé en ce que ledit flan (3) est constitué de polyéthylène téréphtalate.

6. Procédé de fabrication d'un emballage à l'aide du procédé de formation de lignes de rainage selon la revendication 1, caractérisé en ce qu'après ladite étape de formation de lignes de rainage, ledit flan (3) est façonné en la boîte (1) présentant les bords arrondis (16, 18, 24) en tant que bords extérieurs de celle-ci, par pliage et cintrage dudit flan avec la surface pourvue de lignes de rainage à l'extérieur.

Drawing