FR2718672A1 - Process for producing a packaging such as a box by folding and cold-bonding a pre-cut blank - Google Patents

Abstract

The method comprises several operating steps. Firstly blanks (21) are cut from a band of semi rigid material. The two parts of the pairs of zones (2,2A - 9,9A) which are to be stuck together are then pre-pasted with a contact glue. This is followed by drying which causes the glue to partially lose its adhesive ability. The blank is then folded around the product and the pairs of glued zones are turned down against each other to obtain contact. On the packets thus made is placed an enveloping film and the packets are placed against each other inside packaging. The packaged packets are held for a day to obtain an increase in the quality of gluing.

Description

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  PROCESS FOR PRODUCING A TEL CONDITIONING

  OR A BOX BY COLD FOLDING AND BONDING A FLAN

PRE-CUT.

  The present invention relates to a method for producing a packaging such as a box by

  folding and cold gluing of a pre-cut blank.

  It applies more particularly, but not exclusively, to the making of cigarette, cigar or similar packaging from a blank made of semi-rigid material such as cardboard or even

  a flexible material such as paper.

  In general, it is known that in order to produce such packages, the blanks are first produced by continuous cutting and creasing of a strip of paper or cardboard. The blanks are then transferred, one by one, to a packaging station in which, just before the folding operation, a glue coating is performed on the gluing zones of the blank, generally on the flaps. This gluing is carried out on one of the sides of the blank using an adhesive for example of the "PVA" or "HOTMELT" type, by gluing devices provided in the packaging machine.

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  The position of these gluing machines just before the folding station is imperative because of the presence of liquid or pasty glue on the blanks: This presence makes some manipulations impossible if one wants to avoid glue stains. Moreover for the same reason, it requires a special design of the blanks and post

folding.

  The bonding process which takes place at the level of the bonding areas on which are applied, during folding, the corresponding bonding areas is of conventional type. In the two parts in contact, the solvent of the glue, for example water, migrates inside the carton or

  paper. Bonding then occurs during drying.

  Therefore, to ensure a good bonding, it is necessary to maintain these two parts in contact with each other throughout the drying period and provide at the packaging station, a plurality of heat sources whose effects are likely to be detrimental to the organoleptic qualities of the foodstuffs, for example cigarettes, contained in the package. Another disadvantage of adhesives of this type is that they can not be applied to bonding areas of large dimensions, because of the risk of overflow of glue that occur when pressurized contact areas to paste, as well as any damage resulting from the absorption by paper or cardboard, of

important solvent.

  The object of the invention is therefore more particularly to not only eliminate these disadvantages but also

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  to achieve greater freedom in the design of blanks and the realization of bending and packaging stations. For this purpose, the method according to the invention comprises, before the packaging operation, a pre-sizing operation and, optionally, drying of the two parts of each pair of zones to be bonded to each other, to the using a contact adhesive which loses its adhesive power after drying, vis-à-vis any other material itself, the gluing phase then occurring in the packaging station that during the application of said parts

one against the other.

  Advantageously, this pre-gluing operation can be performed during the printing operation and

cutting blanks.

  Thanks to the properties of the glue, the pre-glued and dried blank can be handled by conventional means without risking to soil the installation and, consequently, the following blanks. Similarly, there is no fear of any overflow of glue or deterioration of the paper

or cardboard.

  On the contrary, it will be possible to provide larger bonding areas. The pre-gluing zones may, in turn, exceed the dimensions of the gluing areas, which are limited to

  then at the intersections of the pre-glued areas.

  Another advantage of the process according to the invention consists in the fact that it allows a pre-gluing of the zones located on both sides of the blank, which was not possible with the usual glues, because of the problems of

  subsequent handling of the blank.

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  The adhesive used in accordance with the process according to the invention may consist, for example, of a cold glue composed of a latex dispersion in water and proposed by several companies, in particular: - the company CRODA FRANCE SA in Trappes, - the Company NATIONAL STARCH & CHEMICAL ADHESIVES to

Villefranche sur Saone.

  These glues are easily applicable when printing cuts on gravure printing machines, for example in aqueous dispersion with subsequent syneresis of water in the subsequent production. They make films that,

  once dried, remain translucent.

  Of course, the invention also relates to a process comprising in combination gluing using an adhesive

  contact and a collage of traditional type.

  Embodiments of packs of cigarettes according to the process according to the invention will be described hereinafter, by way of non-limiting examples, with reference to the appended drawings in which: FIGS. 1 and 2 are representations of a blank seen from the side of the outer face (Figure 1) and seen from the side of the inner face (Figure 2), on which the pre-gluing zones have been indicated; Figures 3 and 4 show an alternative embodiment of a blank for cigarette pack of a type similar to that illustrated in Figures 1 and 2; - 5 - Figures 5 and 6 show another alternative embodiment of a blank adapted to the implementation of the method according to the invention; Figure 7 shows, in perspective, a pack of cigarettes obtained with the aid of Figures 1, 2, 3, 4 and 5, 6; Figures 8 and 9 similarly show the printed side and the inner side of a blank of the slide of a drawer / slide package; Figure 10 is a schematic perspective view for illustrating the principle of a drawer / slide type cigarette package. The blank 21 whose two faces 21 ', 21 "are shown in FIGS. 1 and 2 is used for producing a package

  of cigarettes such as that shown in Figure 7.

  This package, in the closed state (solid lines), has a parallelepipedal shape and comprises two rectangle trapezoidal parts, namely: a body 22 and a lid 23, these two parts open at their level.

  oblique face which constitutes the assembly face (plane P).

  The small base 24 of the cover 23 consists of an extension of the large base 25 of the body 22, the separation between these two bases being materialized by a fold line 26 which allows the lid 23 to swing between an open position (broken lines).

  and a closed position (solid lines).

  The blank 21 for making this package is obtained by cutting and creasing a semi-rigid cardboard strip of the same width as the blank, the cut, at the level of

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  the anterior end of the blank, delimiting a reentrant trapezoidal shape while that carried out at the posterior end delimits a shape

truncated triangular.

  In the example shown in FIGS. 1 and 2, the small base of the reentrant trapezoidal shape is extended by an appendage 28 of the same width but of

short length.

  The blank comprises two longitudinal fold lines 29, whose spacing corresponds to the width of the pack of cigarettes that is to be obtained, these two fold lines 29, 30 delimiting a central band, being bordered by two side strips of width equal to

the thickness of the package.

  It further comprises six transverse fold lines T1 to T6 which extend over the entire width of the central strip 31 of the blank 21 and are extended to

  level of sidebands by cuts D1 to D5 -

From i to D'5.

  The first folding line T1, starting from the left, delimits with the front edge of the central strip 31, a rectangular range P1 corresponding to the front face of the lid 23 and, with the oblique front edges of the two side strips, two flaps R1, R'i

Trapezoidal shape.

  The second fold line T2 delimits with the first, in the central band 31, a rectangular area P2 corresponding to the upper face of the cover 23 and of equal width to that of the package and, at the level of the strips

  side 1 ', 1 ", two rectangular flaps R2, R'2.

  The third fold line T3 is extended by two oblique cuts D3, D'3 which extend in parallel

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  at the oblique edges of the trapezoidal re-entrant form and the truncated triangular shape. It delimits with the second line T2 a relatively narrow rectangular area P3 which constitutes the rear face of the cover 23 and, at the level of the side strips 1 ", 1 ', two trapezoidal areas R3, R'3 which constitute the lateral faces

of the lid.

  The fourth fold line T4 delimits with the third face a rectangular area P4 which corresponds to the rear face of the package body, flanked by two side plates R4, R'4 of trapezoidal shape which partially form the side walls of said body. The fifth fold line T5 delimits with the fourth, a rectangular range P5 constituting the bottom of the body, this range P5 being bordered by two beaches

  rectangular flaps R5, R'5.

  This fifth fold line also delimits, with the front edge of the blank, a rectangular area P6 constituting the rear face of the body of the package. This range P6 is bordered by two lateral areas R6, R'6, which constitute the lateral faces of the body, and by the appendage 28. The latter is, preferably, connected to the beach by means of a line of crease or embossing T6 of large dimensions, so as to obtain a good mutual positioning, vis-à-vis the front face of the cover 23 when it is in

closed position.

  The folding mode of the blank 21, to obtain the package shown in Figure 5, is of conventional type and will not be indicated in detail. For ease of understanding, arrows have been used to indicate

folds.

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  According to the process according to the invention, before the folding phase and, preferably, during the cutting phase, the various areas to be glued are pre-sized and then dried, using a contact adhesive such as than previously defined. In this example, this pre-gluing is performed on both sides of the blank in areas indicated by geometric figures such as numbered rectangles or triangles. According to the numbering, a zone bearing a number is intended to be stuck on an area bearing the same number but assigned the letter A. Thus, the outer face of the blank comprises zones 4A, A - 2A, 3A - 6A, 7A - 8A, 9A respectively distributed on the flaps R'2, R2, the flaps R'3, R3, the beaches

R4, R'4, and the flaps R'5, R5.

  The inner face of the blank comprises, in turn, zones 2, 3 and 6, 7 distributed over the flaps R'i, R1 and the side plates R6, R'6. It further comprises two rectangular zones 4, 5 made on the beach P2 opposite the flaps R2, R'2 and two rectangular zones 8,

  9 carried out on the beach P5 opposite the flaps R'5, R5.

  For the reasons previously indicated, the bonding is obtained at the end of folding when the corresponding zones are applied against each other.

other.

  The appendix can undergo, after folding, a pre-gluing using an infinite open-time glue allowing the repeated opening and closing of the package, in

  ensuring a better seal.

  The blank shown in FIGS. 3 and 4 is very close to that shown in FIGS. 1 and 2.

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  why we used references

  identical to designate like parts.

  However, unlike the previous version, the appendix 28 is extended by two trapezoidal tongues 28 ', 28 "whose large base extends parallel and at a short distance and over the entire length of the oblique ends of the side plates R6, R' 6. These tongues 28 ', 28 "are intended to be applied and stick on the side faces R1, R'i of the cover 23 and thus have, on the outer side of the blank 21, two pre-gluing zones 2' A, 3'A respective, intended to be applied on two corresponding pre-bonding areas 2 ', 3' provided on the side faces R1, R'l of the lid on the inside of the blank. The tabs 8 ', 8 "are fixed by easily breakable means, for example connections of small width, at the oblique ends of the side plates R6, R'6, so as to allow the lid 23 to be opened by a consumer. Such an arrangement makes it possible to ensure the closure of the package and testifies to its integrity until it is opened by the consumer.In this example, the trapezoidal areas R3, R'3 have, at the level of the cutouts, indentations E1, E2 of forms

  complementary to those of the tabs 28, 28 '.

  Advantageously, the zones of one face of the blank situated at the level of the pre-glued zones carried on the other face of the blank may be covered with a repellent varnish to prevent the adhesion of the blanks to one another, when

these are stacked.

  The use of the blank previously described may be intended for the end user. In this case, it can be offered to the customer, separately, or be integrated into a cartridge

from 5 to 10 packs.

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  For this, it can be placed on a large face of the cartridge or the folder by folding the two side strips on the central strip so that the blank does not exceed the cartridge. In this case, the pre-sizing areas of the blank are not in contact with their counterparts and will not be active. They can therefore fulfill their role during the shaping of the product. This one can be very easily realized with

the hand by the consumer.

  In the example shown in Figures 5 and 6, the blank has no appendix 28. However, it has a rectangular flap R8 connected to the front edge

  of the beach Pi by a transverse fold line Tg.

  On the inside of the blank, the flap R8 and the beach P1 carry two longitudinal pre-gluing zones 1, 1A-1 ', the A, spaced apart from one another, which allow the flap R8 to be fixed against the beach. Pi in folded position. The lateral pads bear respectively two longitudinal pre-gluing zones 12 starting oblique cutouts D3 D'3. Likewise, the rectangular beach P6 carries two longitudinal zones of

pre-sizing 11.

  On the side of the outer face of the blank, the flap R8 carries a transverse pre-gluing zone 10, while the pre-gluing zones 6A, 7A have two rectangular notches E3, E4 making it possible to avoid any gluing

  with the tracks 12 when the blanks are stacked.

  In this example, the blank further comprises a separate collar 32, substantially C-shaped comprising a central core 33 and two lateral wings 34, 35. This collar 32, whose width corresponds to that of the blank 21, comprises two lines of folding L1, L2 corresponding to the longitudinal fold lines 29, 30. The central core 33 comprises two longitudinal pre-gluing zones 10A, 11A intended to be applied temporarily on the beach

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  and finally on the beaches 11. Similarly, the lateral wings 34, 35 comprise two longitudinal pre-gluing zones 12A intended to come and stick permanently against the zones

12.

  This arrangement ensures a better closure of the box by contacting the pre-glued areas 10 and 10A. It also improves both the tightness of the pack before consumption and its appearance during consumption thanks to a better holding in the closed position of the cover after maneuvering

to extract cigarettes.

  The cigarette pack shown in FIGS. 8, 9 and 10 comprises a tubular case 76 of parallelepipedal shape in which it engages and can slide

  a drawer 36 enclosing the cigarettes.

  The blank used to make the case 37 consists of a rectangular cardboard strip provided with four transverse fold lines L3 to L6 which delimit the two main faces FP1, FP2 of the case, its two lateral faces FT1, FT2 and a tab fixing PF. On the side of the outer face of the blank, the fixing lug PF carries a pre-gluing zone 41, while on the inside, the border of the blank opposite the lug PF, carries a corresponding pre-gluing zone 41A. Once these areas 41, 41A pre-glued, the operations of folding, gluing and automatic insertion of the drawer in the case are performed in an extremely simple manner, without having to provide additional glue and without risk of

glue stain.

  As in the examples previously described, the invention makes it possible to eliminate the heating means which ensure the bonding on the traditional machines and thus ensures better preservation of the qualities.

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  organoleptics of cigarettes that are not subject to heat sources during the manufacture of packages. It also simplifies equipment and improves efficiency. Because it allows larger bonding areas, it increases the watertightness of

packets of cigarettes.

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Claims (12)

claims   1. A method for producing a packaging such as a box by folding and cold-bonding a pre-cut blank, this method comprising an operation for producing the blanks, and a packaging operation comprising folding and gluing the blank. blank, characterized in that it comprises, before the packaging operation, a pre-sizing operation and, optionally, drying of the two parts of each pair of zones to be bonded to one another, using at least partially contact adhesive, its adhesive power after drying vis-à-vis any other material itself, the bonding phase then occurring in the packaging station that at the time of   the application of said parts against each other.   2. Method according to claim 1, characterized in that the pre-gluing operation is performed during the printing operation and cutting blanks.   3. Method according to one of claims 1 and   2, characterized in that the pre-sizing is carried out on   areas on both sides of the blank.   4. Method according to one of the claims   previous, characterized in that the pre-gluing zones have different dimensions from those of the gluing areas, they are then limited to intersections pre-sized areas.   5. Method according to one of the claims   preceding, characterized in that the aforesaid contact adhesive is a cold glue. - 14 - 2718672   6. Method according to claim 5, characterized in that the said glue comprises a latex dispersion in water.   7. Method according to one of the claims   previous, characterized in that it comprises the application of a repellent varnish on the areas of one face of the blank located at the level of the pre-glued areas carried by the other side of the blank, to prevent the adhesion of the blanks enter   they, when they are stacked.   8. Method according to one of the claims   preceding, characterized in that folding operations and   packaging are made in the factory.   9. Method according to one of claims 1 to 7   characterized in that the folding and packaging operations are carried out by the consumer, the blank being used to make a case delivered with a cartridge of product such as cigarettes.   10. Method according to one of the claims   preceding, characterized in that it comprises a pre-gluing of certain areas using an open-time glue   infinite allowing collages and repeated takeoffs.   11. Method according to one of the claims   preceding, characterized in that it comprises in combination a bonding using a contact adhesive and a bonding of traditional type. - 15 - 2718672 -15 -   12. Method according to one of the claims   previous, characterized in that the blank has a substantially rectangular shape whose front end has a re-entrant trapezoidal shape, while the other end has a truncated triangular shape, and in that this blank comprises two longitudinal fold lines defining a central strip and two lateral strips, and six transverse fold lines which extend over the entire width of the central strip of the bottom and are extended at the level of the lateral strips and which delimit at the level of the central strip, successively, the anterior faces upper and posterior of a lid and the rear face, the bottom and the front face of the package, the aforesaid cutouts defining at the level of the two side strips, the side faces of the lid, a flap, a lining of the side faces of the lids, a lining of the lateral faces of the body of the beaches of   reinforcement of the bottom and the lateral faces of the body.