FR2872488A1 - Nestable tray for holding milk product e.g. cheese, has lateral walls equipped with panel that is provided with longitudinal flap intended to form fold, which extends over part of height of lateral walls - Google Patents

Abstract

The tray has four lateral walls (2-5) and a base (6), where the walls (3, 5) are equipped with a panel (9). The panel is provided with a longitudinal flap (11) that is intended to form a fold, which extends over part of the height of the walls. The walls (3, 5) are equipped with a cavity (12). The tray presents a transversal section and/or longitudinal section to embed the tray in a lower tray. Independent claims are also included for the following: (A) a blank for constituting a nestable tray (B) a packaging including a tray (C) a machine for forming a plate from a blank.

Description

1 2872488

  The present invention relates to a nestable tray made of cardboard sheet material comprising side walls and a bottom. BACKGROUND OF THE INVENTION

  It also relates to a blank for the constitution of such a tray and a machine for forming such a tray.

  It finds a particularly important but not exclusive application in the field of trays stackable on each other for dairy products, such as plastic yoghurt containers closed with lids and arranged in a sheet of four or eight jars interconnected. by their upper part.

  Packaging is already known, for example for cheeses or yoghurt pots, stackable on top of one another so as to constitute stackable piles on a pallet.

  Such batteries must firstly allow the lower packs to withstand the compression of the packages of the top and secondly be fairly stable vertically to avoid tilting laterally. To do this it is generally provided corrugated material sufficiently resistant to compression with vertically disposed grooves, and stacking lugs with corresponding recesses, the weight of a package from above then resting on the walls of the packaging of below.

  2 2872488 The resistance of the material is then sufficient to allow grasping the packaging for example by means of recessed handles in two side faces facing the tray.

  Such solutions, however, have disadvantages. The weight of the carton of the packaging is indeed and for example necessarily greater than of the order of 400g / m2 and in any case greater than 350g / m2 for reasons of strength of the materials, especially concerning the strength of the handles of gripping.

  Often the embedding of tenons, outgrowth of fragile cardboard, in the recesses, may not fully fulfill the role of blocking and addressing that we want him to play, the height of the stack of packaging is necessarily fixed said stack also having fragile angles.

  The present invention aims at providing a tray, a blank and a machine for forming such a tray from the blank, which better than those previously known to meet the requirements of the practice, in particular by making it possible to overcome these drawbacks by minimizing the weight of the carton and this while stiffening the tray in its length and allowing the presence of solid gripping handles, easy to grasp for a user.

  With the invention, it is thus observed a great ease of stacking with excellent resistance angles to the links and films and an optimized cost.

  The invention will allow embedding the packs within each other with height of 3 2872488 stack that adjusts to products and a load distribution on all products.

  The fact of directly resting the packages of the top on the products of the bottom will allow, surprisingly, to overcome much of the strength of the walls of the tray itself for products like jars of yoghurt or jars having sufficient resistance to compression and / or capable of withstanding reversible elastic deformation.

  The bevel formation of the bottom of the tray unexpectedly strengthens the rigidity of the plate during side impacts, which is particularly interesting during the conveying and handling of packaging.

  For this purpose, the present invention proposes, in particular, a board made of cardboard sheet material comprising side walls and a base, characterized in that two opposite side walls each comprise a flap provided with a longitudinal flap intended to form a rim on a part the height of said flap and are respectively provided with a recess forming a handle located below said rim and in that the lower part of each of the side walls forms a cut-off sloping towards the inside of the tray clean to allow a recess in the less partial said plateau in a lower plateau.

  The bottom thus has a beveled shape transversely and longitudinally.

  The beveled shape allows for a self centering during the stacking of the trays especially when automatic means are implemented to achieve such a stack.

  The hand of the user will therefore be able to grasp a reinforced portion of particularly strong cardboard at the edge of the rim, while allowing an excellent stacking trays by nesting into each other.

  In advantageous embodiments, one and / or the other of the following provisions is also used: the grammage of the carton is less than or equal to 350 g / m 2; - The tray is corrugated cardboard whose grooves are parallel to the bottom of said tray, perpendicular to the rim which increases the stiffening of the plate in the direction of the length; - Two opposite side walls are formed of flaps respectively connected on either side by first fold lines to end flaps partially forming the other two walls; - Each end flap is fixed on the outer face of the flap with rim of the adjacent side wall. Such an arrangement reinforces the holding of the handle and allows to squar the side walls during the formation of the tray; - The opposite side walls comprising the longitudinal flaps forming a rim, have a central vertical portion lower than the adjacent side walls; the tray is arranged to contain at least two superposed layers of containers connected to each other in the upper part of each of said sheets, the respective dimensions of the containers and the tray being such that the upper layer of containers is adapted to bear the weight of the top tray via or not an interposed intermediate plate; the dimensions of the plate are arranged to allow the plates to be recessed one inside the other over a height less than or equal to 1/3 of the height of said plate; - The respective dimensions between containers and tray are arranged so that the lower face of the upper part of the product sheet resting on the bottom of the tray is above said rim.

  The invention also proposes blanks for forming the trays as described above.

  It also proposes a blank for the constitution of a tray, comprising a rectangular central panel provided on each side with a flap, namely two opposite rectangular or substantially rectangular first flaps and two opposite rectangular or substantially rectangular second flaps, said second flaps opposed being respectively connected on either side by first fold lines to end flaps, characterized in that said first flaps each comprise a longitudinal flap adapted to be folded towards the inside of the tray and to be fixed by bonding on one side of said first corresponding flap to form a rim on a portion of the height of said flap, said flap being further provided with a recess forming a handle located below said rim once it has been made and in that each flap is connected to the central panel by a band connected respectively on either side of the band a udit shutter and the central panel by parallel fold lines, the lateral edges of the strip extending obliquely outwardly relative to the central panel.

  In other words, the first fold lines are connected to the central panel by the free edge of an intermediate band, said free edge being at an angle to the edges of the bottom of the plate; Thus, the lateral edges of the intermediate strips are angled with respect to the fold lines, on a first portion located on the side of the central panel so as to give the bottom of the tray a partial frustoconical section in the transverse and longitudinal directions of the tray , the walls then being vertical again.

  The invention also proposes a package comprising a tray of the type described above, characterized in that it comprises at least one sheet of at least two rows of containers connected together by their upper parts, the respective dimensions of the containers. and the tray being such that the upper layer of containers is adapted to support the weight of the top tray via or not an interposed intermediate plate, for example and advantageously due to the possible partial embedding between trays.

  The invention also proposes a machine for forming a tray from a blank of sheet material having a bottom panel provided with side flaps, some of which have end flaps and form the side walls of the tray, characterized in that said machine comprises: - a support plate on the surface of said bottom panel, comprising lateral edges raised to form a frustoconical section plate in the transverse and longitudinal directions, of shape complementary to that of the bottom of the plate to forming, - a mandrel having an application portion of complementary shape to that of the support plate, - means for applying said mandrel to said support plate, - means for folding the side flaps and the corresponding flaps against the faces facing said mandrel, and means for fixing to each other said flaps and flaps thus folded.

  In advantageous embodiments, one and / or the other of the following provisions is also used.

  the mandrel is retractable between a first forming position of the plate and a second position of disengagement of the walls of the plate; - The retractable mandrel is formed by an armature having four edges perpendicular or oblique with respect to the application face, the edges being cut corners; - The means for folding the side flaps comprise at each corner of the tray an application roller arranged to push the flaps and flaps facing a flat position between a position and a position where the flaps and flaps are fixed to each other for form the plateau; the platform comprises two opposite longitudinal lateral flaps respectively provided with end flaps and two opposite transverse lateral flaps, each comprising a longitudinal flap, the machine further comprising glueing devices for depositing lines of adhesives during the feeding of a flap; blank on said transverse flaps and / or longitudinal flaps and pressing members provided for applying the longitudinal flaps on the adjacent transverse side flaps to form overlays; - The pressing members comprise at least one vertical vertical plate arranged to press the bottom panel on a bearing surface at a distance from the junction line with the corresponding longitudinal flap, and means for folding and plating the longitudinal flap comprising an applicator member, comprising for example a cylinder, arranged to fold said flap on the adjacent flap.

  The invention will be better understood on reading the following description of embodiments given as non-limiting examples.

  The description refers to the drawings which accompany it in which: Figure 1 is a top view in perspective of a tray according to the embodiment of the invention more particularly described here.

  - Figure 2A is a partial sectional view of Figure 1 according IIAIIA.

  - Figure 2B is a partial sectional view of Figure 1 according to IIBIIB.

  FIG. 3 is a top plan view of a blank for forming the tray according to FIG.

  - Figure 4 is a plan view of a blank corresponding to another embodiment of the invention.

  - Figure 5 is a partial sectional view of the platen plating device in the retracted position (first half-section) and in the application position (second half-section).

  - Figure 6 is a partial sectional view of the retractable mandrel system according to one embodiment of the invention in the retracted position (first half-section) and in the application position (second section).

  Figure 7 is a perspective view of the base plate support plate on the mandrel according to one embodiment of the invention.

  Figure 1 shows a tray 1 of double-sided corrugated cardboard of thickness between 1 and 3.5 mm, weight 330 g / m2, made from three sheets of paper 100g / m2.

  In other embodiments, it is used three sheets of grammages 90g / m2, see 80g / m2.

  This light weight paper was not used for the tray cartons of the prior art because it was considered too weak, especially for handles and vertical compression.

  The tray 1 has four side walls 2, 3, 4 and 5 and a bottom 6.

  The two opposite side walls 3 and 5 are identical and comprise three parts, namely two rectangular flaps 7, 8 respectively integral with, and of the same height as the adjacent side walls 2, 4, and a rectangular flap 9 connected to the bottom 6 by an intermediate band 10. More precisely the intermediate band 10 has lateral edges 11 angled outwards with respect to the fold lines 12 with the bottom, and have an angled shape, for example making with the vertical an angle between 5 and 45, for example 10.

  In another embodiment, the flaps 7 and 8 may for example have an L shape, for example inverted, whose main leg is located on the side of the corresponding flap corresponding 2 or 4, which allows in particular a better guiding of the blank to flat towards the training plan.

  The flap 9 further comprises a longitudinal flap 12 forming a rim on a portion of the height of said flap for example one third or half of said height. The flap 13 is folded over the flap to form the rim around the double connecting line 14.

  Each flap is provided with a central recess 15, for example of oval shape, of a size allowing gripping by the hand of a user, this obviously being located just below the rim once it folded and glued on the inner face of the corresponding side wall.

  This handle has for example a lower side coinciding with the lower edge forming a fold line 16 connecting the side wall and bottom.

  The other two side walls 2 and 4 comprise a band 17 at an angle, junction with the bottom ridge, of the type of intermediate strips 10.

  Each side wall comprises in a manner known per se recesses which will allow the ventilation of the products stored in a pallet, namely recesses 18 for example oval, in the opposite longitudinal side walls 2, 4 and small round recesses 19 in the flaps 7 and 8 of the opposite side walls 3, 5.

  According to the embodiment of Figure 1 the lower part of the tray walls has longitudinal and transverse frustoconical sections adapted to allow at least a partial embedding of the entire bottom of the tray in a lower tray.

  In the remainder of the description, the same reference numbers will be used to designate identical elements.

  Figures 2A and 2B show in partial section cut corners or strips 10 and 17 forming the lower parts of the walls at an angle with the horizontal between 45 and 89 for example 80 or 85.

  FIG. 3 is a plan view of the blank 20 making it possible to obtain the plate of FIG. 1.

  The blank 20 comprises a central panel formed by the rectangular base 6 provided on each side with a flap adapted to constitute at least partly a side wall, namely two opposed first rectangular flaps and two opposite second flaps 2 and 4 rectangular said second opposed flaps being respectively connected on either side by first fold lines 21 end flaps 7,8.

  The flaps 7, 8 are adapted to be folded towards the inside of the tray and to be fixed by gluing on the outer face of the corresponding first flap 9 to form the side walls 3 and 5. The first flaps 9 comprise a flap rectangular longitudinal 13 capable of forming a rim on part of the height of said flap as described above with reference to Figure 1.

  The first flaps 9 are in addition respectively provided with a central orifice 15 for example of oval shape and of dimensions allowing the gripping by a hand of a user who will form a handle and which will be located below the rim once the latter realized .

  More precisely the future rim is formed by the horizontal flap 13 connected to said flap 9 for example by a double fold line 14, said flap 9 being connected to the panel by the strip provided on either side of the fold lines 16, 16 parallel to junction with the plate 6 on one side and with the rest of the flap 9 on the other.

  The recess 15 is thus straddling the strip 10 cut corner whose side edges are biased outwardly and extended by the free peripheral edges of the flap 9 corresponding.

  In this embodiment, the first fold lines 21 are straight, and then replaced by free edges 22 at an angle to the sides of the plate opposite, situated in their extension, so as to give the lower part of the wall a frustoconical shape in the longitudinal direction to the plate once formed, the small base of the wall being connected to the central panel 6 by a fold line 23 and cut wedge between said fold line 23 and a parallel fold line 24 connected to the rest of the corresponding part 2 or 4.

  Such a blank makes it possible to form a plate provided with a bottom having a trapezoidal section in the transverse and longitudinal direction.

  In the embodiments more particularly described here the flutes are parallel to the flaps provided with side flaps.

  FIG. 4 shows a variant of the blank of FIG. 3 to form a plate whose height of the transverse walls 31 is the same as those of the longitudinal walls 32.

  The ventilation apertures 33 are here straddling the longitudinal strips 34 and 35 forming the frustoconical bottom in both directions of the plate.

  FIGS. 5, 6 and 7 show a plate 40 of the mandrel machine according to the embodiment of the invention more particularly described here suitable for forming the plate of FIG. 1.

  The feed means of the blank 41 horizontally between the mandrel 42 and the plate 40 are known in themselves and are not described further.

  Furthermore, and without it being necessary to refer to a specific figure, the blank to be formed in a tray is prepared beforehand by gluing the ribbons. For this purpose, the plate 28 comprising two longitudinal lateral flaps 2, 4 opposite respectively provided with end flaps 7 and 8, and two opposite transverse lateral flaps 9 each comprising a longitudinal flap 13, the machine further comprises gluing devices allowing depositing adhesive lines during the feeding of a blank to said transverse flaps and / or longitudinal flaps and pressing members provided for applying the longitudinal flaps to the adjacent transverse lateral flaps to form overlaps.

  The pressing members comprise, for example, at least one longitudinal vertical plate arranged to press the bottom panel onto the bearing face at a distance from the junction line with the corresponding transverse flap, and means for folding and plating the longitudinal flap. comprising an application cylinder arranged to fold said flap on the adjacent flap.

  Once the blank positioned for example above the support plate 40 of frustoconical transverse and longitudinal sections (see Figure 7), it is moved upwards to form the bottom of the package (see Figure 5). ) via pusher means 43 secured to the plate and plating arms 44 provided at their end with roller 46 plating on the walls 45 of the mandrel.

  More specifically, the plating arms 44 are arranged to move vertically between an erased position 47 and a plating position 48, obviously 49 (see FIG. 7) being provided in the cut corners 50, of the plate to allow said arms to pass with their rollers, the other two 2872488 side edges 51 diagonally of the plate being for example continuous.

  Advantageously (see Figure 6) the mandrel 42 is retractable in both longitudinal and transverse directions, by means of cylinders 52 secured to plates 53 of internal pressure against, to form the package with the blank 41.

  Means 54 for external pressurization, for example with a jack, are actuated simultaneously to conform the walls of the plate above the plate, and to have the final bonding by pressurization in a manner known in itself the elements having been glued together. in advance by means provided also of known type.

  After forming the packages, they are filled with products whose total height inside each tray is less than the total height of the side walls of the package.

  For example, each package comprises two plies of two rows of containers, for example yogurt pots, connected to each other in the upper part of each of the plies, in a manner known per se.

  The respective height dimensions h of the containers and the plate H are such that the upper part of the container of the top layer is at a distance less than the total height H (2h <H).

  Given the frustoconical character at the bottom of the boxes the bottom of the walls of the upper plate is embedded in the walls of the lower plate, so that the bottom of said upper plate rests on the products, for example via 16 2872488 a plate, and not on the side walls of the plate 1.

  This allows lowering of the loads of the upper trays independent of the strength of the carton, since it is the products that support the weight of the trays above.

  As is also evident from the foregoing, the present invention is not limited to the more particularly described embodiments. On the contrary, it encompasses all the variants and in particular those in which the packaging comprises more than two layers of superimposed products and / or those where the wrapping is made towards the outside of the component concerned and not towards the interior and / or where the flaps are glued inside said flap provided with the rim.

Claims (18)

  1. A tray (1) made of cardboard sheet material comprising four side walls (2, 3, 4, 5) and a bottom (6), characterized in that two opposite side walls (3, 5) each comprise a flap ( 9) provided with a longitudinal flap (13) intended to form a rim on part of the height of said flap and are respectively provided with a recess (15) forming a handle located below said rim and in that the lower part of each of the side walls forms a cutaway (10, 17) slanting towards the inside of the tray adapted to allow at least partial embedding of said tray in a lower tray.   2. Tray according to claim 1, characterized in that the basis weight of the board is less than or equal to 350 g / m2.   3. Tray according to any one of the preceding claims, characterized in that it is corrugated cardboard whose grooves are parallel to the bottom of said plate perpendicular to the rim.   4. Tray according to any one of the preceding claims, characterized in that two opposite side walls (2, 4) are formed of flaps respectively connected on either side by first fold lines (21) to flaps d end (7, 8) partially forming the other two side walls.   18 2872488 5. Tray according to claim 4, characterized in that each end flap (7, 8) is fixed on the outer face of the flap (9) with riming of the adjacent side wall.   6. Tray according to any one of the preceding claims, characterized in that the opposite side walls (3, 5) comprising the longitudinal flaps forming a rim have a central vertical portion lower than the adjacent side walls.   7. Tray according to any one of the preceding claims, characterized in that it is arranged to contain at least two superposed layers of containers connected to each other in the upper part of each of said plies, the respective dimensions of the containers and the tray being such that the upper layer of containers is adapted to support the weight of the top tray via or not an interposed intermediate plate.   8. Tray according to any one of the preceding claims, characterized in that its dimensions are arranged to allow a recess trays in one another to a height less than or equal to 1/3 of the height of said tray.   9. Tray according to any one of the preceding claims, characterized in that the respective dimensions between containers and tray are arranged so that the lower face of the upper part of the lower ply is above said rim.   19 2872488 Flan (20, 30) for forming a tray, comprising a rectangular central panel provided on each side with a flap, namely two opposite first flaps (9) and two opposite second rectangular flaps (2, 4). or substantially rectangular, said second opposed flaps (2, 4) being respectively connected on either side by first fold lines (21) to end flaps (7, 8), characterized in that said first flaps (9) each comprise a longitudinal flap (13) adapted to be folded towards the inside of the plate and to be fixed by gluing on one face of said first corresponding flap to form a rim on part of the height of said flap, said flap being further provided with a recess (15) forming a handle located below said rim once the latter realized and in that each flap is connected to the central panel by a strip (10, 17) connected respectively on either side of the aud band it flap and the central panel by parallel fold lines (23, 24; 16, 16 '), the lateral edges of the strip extending obliquely outwards with respect to the central panel. 11. in that at 350g / m2. 12. Blank claims   corrugated cardboard, the flutes being parallel to the flaps (2, 4) provided with side flaps.   Blank according to claim 10, characterized in that the grammage of the carton is less than or equal to any one of 10 and 11, characterized in that it is   13. Blank according to claims 10 to 12,   any of the characterized in that the 2872488 second flaps (2, 4) are larger in width than the first flaps provided with flanging flaps.   14. Package comprising a tray according to any one of claims 1 to 9, characterized in that it comprises at least one ply of at least two rows of containers connected to each other in the upper part of each of said plies, the dimensions respective containers and the tray being such that the upper sheet of containers is adapted to support the weight of the top tray via or not an interposed intermediate plate.   15. Machine for forming a tray (1) from a blank (20) of sheet material having a bottom panel (6) with side flaps (2, 3, 4, 5) comprising for some end flaps (7, 8) and forming the side walls of the tray, characterized in that said machine comprises: - a support plate (40) on the surface of said bottom panel, including lateral edges (50, 51) raised to form a frustoconical section plate in the transverse and longitudinal direction, of shape complementary to that of the bottom of the plate to be formed, - a mandrel (42) having a complementary shape application portion of that of the support plate, - means (43) for applying said mandrel to said support plate, - means (44) for folding the lateral flaps and the corresponding flaps against the faces facing said mandrel, and 21 2872488 - means for attaching to each other said flaps and flaps thus folded ed.   16. Machine according to claim 15, characterized in that the mandrel (42) is retractable between a first forming position of the plate and a second release position of the tray walls.   17. Machine according to any one of   claims 15 and 16, characterized in that,   the plate comprising two opposite longitudinal side flaps (5, 6) respectively provided with end flaps (7) and two opposite transverse lateral flaps (8, 9) each having a longitudinal flap, it further comprises glue-making devices for depositing adhesive lines during the feeding of a blank to said transverse flaps and / or longitudinal flaps and pressing members provided for applying the longitudinal flaps to the adjacent transverse lateral flaps to form overlaps.   18. Machine according to claim 17, characterized in that the pressing members comprise at least one longitudinal vertical plate arranged to press the bottom panel on the bearing face at a distance from the junction line with the corresponding transverse flap, and folding and plating means of the longitudinal flap comprising an application cylinder arranged to fold said flap on the adjacent flap.