FR2836123A1 - Cardboard tray with holes, e.g. for packaging yoghurt pots, has openings in end walls for passage of shaping mandrels - Google Patents

Abstract

The tray (12), made from a single layer of cardboard, cut and folded to shape, has a continuous base, side (6) and end (10) walls, and an upper surface (5) with holes (2). At least one of the end walls (10) has openings (15) at both edges to receive mandrels (16) that are used to fold the cardboard layer into a parallel-piped shape. A variant of the design can have flaps formed by the cut out holes to act as spacers between layers.

Description

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PLATE WITH HOLES
The present invention relates to a tray with holes in corrugated sheet material, comprising a bottom wall, a side wall belt and an upper wall with holes.

 It also relates to a blank and a set of blanks making it possible to obtain such a tray.

 It also relates to a method of forming a plate with holes around a mandrel.

 It finds a particularly important although not exclusive application in the field of packaging of dairy products, such as yogurts, jars of cream or even for the transport of fragile products that need to be fixed on a support to avoid shocks.

 We already know trays with holes. They are formed from corrugated cardboard or polystyrene trays and require a shrink wrap.

 Such systems have drawbacks. In fact, in addition to the problems associated with shrinking the film during shelving, these systems have low filling rates due to the lack of precision and squareness of the tray with holes used.

 Plastic film and polystyrene tray also constitute non-recyclable waste.

 The present invention aims to provide a tray with holes better than those previously known to the requirements of practice, in particular in that it allows to obtain a mono material packaging, economical, formed at high speed, from in particular

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 of light paper and this, with very important precision, excellent rigidity and optimum squaring of the packaging.

 This high precision will thus allow reliable and high-speed introduction of the products into the cavities of the plate with holes, without play, which results in excellent fixing of the products relative to their support and makes it possible to dispense with the plastic film.

 To this end, the invention provides in particular a tray with holes in a sheet of corrugated cardboard material comprising a bottom wall, a belt of side walls and an upper wall with holes, characterized in that at least one side wall is hollowed out. each of its lateral ends by at least one passage opening for one or more edges of the mandrel for forming the plate around said edges.

 In advantageous embodiments, recourse is had to one and / or the other of the following arrangements: - the side wall is entirely hollowed out on its lateral ends; - the plate is of parallelepiped shape; two opposite side walls are hollowed out at their ends; - The external face of the bottom wall includes recessed and / or projecting surface portions, suitable for allowing the embedding of one or more upper parts of products embedded in the holes of the tray below; - the tray is made from a blank comprising a series of four rectangular shutters,

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 namely two main flaps suitable for respectively forming the bottom wall of the plate and the upper wall with holes, and two secondary flaps suitable for forming two opposite side walls, said series being terminated by a fixing tab, and at least two lateral flaps arranged on either side of at least one main flap and adapted to form at least partially the other two opposite walls, called transverse, at least one of said transverse walls being the side wall hollowed out by lights at its ends, said plate being arranged to be mounted automatically by folding down the flaps and flaps around the edges of said mandrel, the end flap of the series of flaps and the tongue on the one hand, and the flaps and / or the adjacent main flap on the other part, being fixed together by gluing to form the plate, the lights of the transverse wall allowing to clear the edges of the mandrel during ejecting the tray; - each main flap has two flaps; - Each flap comprises on its peripheral edge at least one tab which is glued to the external face of the other main flap; - The edge of the tabs has a shape complementary to a part of the periphery of the top of the products suitable for being embedded in the holes of the tray; - The upper wall of the plate comprises at least two rows of holes parallel to the adjacent opposite side walls, said side walls being connected and integral, at the level of each hole, with a

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 tab cut in said upper wall during the formation of the corresponding hole, so that, when the plate is formed around the edges of the mandrel, the tabs remain in the plane of the corresponding side wall and stand perpendicular to the upper wall; - The tray also has a rectangular cap in inverted U, suitable for resting on products embedded in the holes and / or on the upper end of the legs; - The U-shaped cover is formed of a series of at least three flaps including a main flap forming a cover provided on either side, on its lateral edges, notches of shape complementary to that of the tongues, to ensure the wedging between trays stacked one on the other; - The tray is designed for the transport and packaging of products with covers, or an upper part, projecting laterally from the body of said products, the cover having at the fold lines of the branches of the U, zones crushed or hollowed out at the contact portions of the covers or the upper parts of the products with the branches of the U, said zones being of shape complementary to that of the cover portions or of the upper part of the product.

 The invention also provides a blank and / or a set of blanks for the constitution of a plate with holes as described above.

 It also provides a method of forming a plate with holes around a mandrel comprising at least two spaced tubes to form at least four edges of the mandrel, from a blank.

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 comprising a series of four rectangular flaps, namely two main flaps suitable for forming respectively the bottom wall of the plate and the upper wall with holes, and two secondary flaps suitable for forming two opposite side walls, said series being terminated by a tongue of attachment, and at least two side flaps arranged on either side of at least one main flap and adapted to form at least partially the other two opposite walls, called transverse, at least one of said side flaps being hollowed out at each of its lateral ends by at least one lumen passing through a tube of the mandrel, characterized in that the blank is transferred to the gaze of the mandrel, the portions of flaps, of tongue and / or of flaps being glued at the necessary locations, the flaps are wrapped around the mandrel, the fixing tab is pressed on the corresponding flap and the flaps are folded over the mandrel to be e bonded directly to each other or via a bonding tab on the external face of the bottom of the plate, then the plate is ejected from the mandrel, the openings in the transverse wall allowing the tubes to be released from the mandrel when the plate is ejected.

 The invention also provides a tray with holes in a sheet of corrugated cardboard, comprising a bottom wall, a belt of side walls and an upper wall with holes, characterized in that the upper wall of the tray has at least two rows of holes parallel to the adjacent opposite side walls, said side walls being

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 connected and integral, in line with each hole, with a tab cut out from said upper wall during the formation of the corresponding hole, so that, when the plate is formed around the edges of the mandrel, the tabs remain in the plane of the corresponding side wall and stand perpendicular to the top wall.

 Advantageously, the tabs are connected to the adjacent walls by a fold line offset relative to the junction lines between the walls.

It also relates to a blank making it possible to obtain such a plate and to a method for forming around a mandrel of such a tab plate of the above type, with a mandrel of known type.
Also advantageously this tray further comprises a U-shaped cap of the type described above.

 The invention will be better understood on reading the following description of embodiments given by way of nonlimiting examples.

The description refers to the accompanying drawings in which:
Figure 1 is a blank for plate with holes, seen from above, according to a first embodiment of the invention.

 Figure 2 is a U-shaped cover for set of blanks according to a first embodiment of the invention.

 FIG. 3 shows, in axionometric perspective, the plate with holes obtained with the blank of FIG. 1.

 FIG. 4 is a bottom view of the hole tray of FIG. 3.

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 FIG. 5 is a top view, in plan, of the tray of FIG. 3.

 Figure 6 is a schematic cross-sectional view of the hole plate of Figure 3 showing the tubes of the mandrel around which the plate is formed.

 Figures 7 and 8 are top plan views showing two other embodiments of blank according to the invention.

 Figure 9 shows in perspective, two trays according to an embodiment of the invention corresponding to the blank of Figure 7, illustrating the nesting of the bottom of a tray on the products of the lower tray.

 Figure 10 is a top view, in plan, of another embodiment of blank according to the invention.

 Figures 11 and 12 are top views, in plan, of U-shaped caps, for blank sets according to other embodiments of the invention.

 FIG. 13 schematically shows, in top view, a packaging with products provided with indentations at the level of the cap, according to the embodiment of the invention corresponding to the blank of FIG. 11, and a packaging without indentation.

 Figures 14 and 15 are top views, in perspective, of another other embodiment of a plate with holes according to the invention, with tongues and U-shaped cover, respectively before fitting the cover and after fitting of the cap.

 Figures 16 and 17 are top views of blanks for U-shaped caps, according to other embodiments of the invention.

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 In the following description, the same reference numbers will be used to designate the same or similar elements.

 FIG. 1 shows a blank 1 for a tray with two rows of three holes, that is to say six circular holes 2, made of thin double-sided corrugated sheet material, for example 2 mm. Corrugated cardboard is for example cardboard obtained from recycled paper.

 The blank 1 is formed by a series 3 of four rectangular flaps.

 More precisely, the suite 3 comprises two main main flaps 4 and 5, suitable for respectively forming the bottom wall 4 of the plate and the upper wall 5 with holes.

 The holes 2 are intended to receive products (not shown), for example pots of crème fraîche, the lower part of which is force-fitted into a corresponding hole.

 Suite 3 also includes two small secondary components 6 and 7 arranged for one 6 on one side of the component 5, and for the other 7 between the two main components. The flaps are connected together by fold lines 8 which are parallel to each other.

 The main flap 4 forming the bottom also comprises on the other side of the small secondary flap 7, connected by a fold line 8, a rectangular tongue 9, of bonding, suitable for sticking to the secondary flap 6 connected to the flap main 5. The main flap 5 also has on its two other opposite sides, two lateral flaps 10 and 11, suitable for forming the two other opposite walls of the

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 plate 12 (see Figure 3), called transverse walls 10 and 11.

 The flaps are respectively connected to the flap by a fold line 13, perpendicular to the parallel fold lines 8.

 The wall 10 is entirely hollowed out at its ends 14, to form holes 15 for the passage of the tubes 16 (in mixed form in FIG. 3) of the mandrel whose edges 17, 18 and 19, 20 will allow the formation of the plate by tight coating. around them.

 The existence of these lights makes it possible to release the edges of the mandrel, during the ejection of the plate, in the extension of said edges (arrow 21).

 Each flap 10 and 11, is connected on its outer peripheral edge, situated on the side opposite to the main flap 4, by a fold line 22, to a tongue 23 in the shape of an inverted U with the arms crushed, the edge 24 of which has a complementary shape, symmetrically with respect to a central axis 25 of the parallelepiped plate 12, of a part of the periphery of the top of the products, here therefore in the form of a portion of a circle. Such an arrangement will allow, if necessary, an embedding with the top of the boxes or products of the tray below, as will appear more clearly in the light of the embodiment of FIG. 9.

 The flap 11 is, for its part, the length of the main flap 5.

 Figure 2 shows a cover 26 formed of a series of three components, namely a main component 27, central, rectangular, and two side components

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 28, arranged symmetrically with respect to the central axis 25 of the plate, and connected to the main flap by parallel fold lines 29.

 The main flap 27 comprises on either side on its free peripheral edges 30, notches 31 of shape complementary to that of the tongues 23 of the plate, to ensure the wedging between plates stacked one on the other (cf. also figure 4).

formant la coiffe, un encastrement autorisant la diminution de la largeur de ladite coiffe, cote cela sera précisé ci-après. The central flap 27 further comprises, at the fold lines 29, twice two zor. es 32, hollowed out, which will allow the portic-s of contact of the product covers with the branches of the U

forming the cap, a recess authorizing the reduction in the width of said cap, dimension this will be specified below.

, --qiques, formé autour des deux tubes 16 parallélépipédiques, les lignes de pliage 8 du flan 1 étant agencées pour venir coïncider exactement avec les arêtes 17 18,19 et 20 des tubes du mandrin, lors de l'enrobage. Figure 6 is a sectional view of the plate 12

, --qiques, formed around the two parallelepipedic tubes 16, the fold lines 8 of the blank 1 being arranged to come exactly to coincide with the edges 17 18, 19 and 20 of the tubes of the mandrel, during the coating.

 FIG. 7 shows another embodiment of a suite 3 ′ of shutters.

 The main flap 5 'with holes here comprises three rows of four holes 2'.

 The side flaps 10 ′ and 11 ′ are. : here idetic and hollowed out at their ends 14, pOL-forming the lights which will therefore cross the stage from side to side.

 The flaps 10 ′ and 11 ′ each comprise two tongues 23 ′ of shape similar to the tongues 23 to allow the desired embedding.

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 Figure 8 shows a 3 '' series of shutters.

 The main flaps each here include two side flaps 10 '' and 11 '' devoid of tabs, the flaps of the flap 5 '' being adapted to be glued to the flaps of the flap 4 '', each flap here being entirely hollowed out at its ends. 14 '', to form a square hole delimited by the walls on three sides.

 Figure 9 is a perspective view of two trays 12 'along the blank of Figure 7, showing the embedding of the outer face of the bottom 4' of the top tray, with the top 30 of the products 31 embedded in the holes 2 'from the tray below.

 FIG. 10 shows a series 3 of identical flaps to series 3 of FIG. 1, the side walls 6 and 7, being connected, by means of fold lines 32, for example misaligned towards the inside of the flap 5 of a thickness or a half thickness of cardboard with respect to the fold line 8 of junction between shutters, in line with each hole 2, with tabs 33, for example in the form of a boot or T with widened wings, cut out from the shutter and clean (cf. Figures 14 and 15) to stand perpendicular to the wall with holes 5, during forming around the mandrel.

 It is then possible, once the tray has been filled with the products (not shown), to come over the whole with a U-shaped cap 34 of the type shown in FIG. 11, the main flap 35 of which has notches 36, to cooperate with the tongues 23 projecting from the upper plate.

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 Rectangular lateral notches 37 in the fold lines 38 with adjacent flaps 39 of the cap can also be provided.

pour encastrement, avec des échancrures trapézoidales 46 (figure 12), en U renversé avec jar. bes en arc de courbe 47 (figure 16), ou en demi cercle 48 (figure 17). Figures 12, 16 and 17 give other embodiments of caps 40, 41, 42 for a tray of the type obtained with the blank of Figures 7 and 8, whose free peripheral edges 43, 44, 45 are notched.

for embedding, with trapezoidal notches 46 (Figure 12), in inverted U with jar. bes in arc of curve 47 (figure 16), or in semicircle 48 (figure 17).

 FIG. 12 also more particularly shows notches or hollowed out or crushed zones 49 to limit the width of the cap. These zones 49, hollowed out or crushed at the tangency portions of the covers or of the upper parts of the products, and of shape complementary to that of these portions, will indeed allow embedding, which allows a gain of du-. ension, as shown with reference to FIG. 13, for a plate with six holes.

 Here the recessed areas (plate 50) perme ~ in gaining, thanks to the lateral embedding of the products 51 a distance d, relative to a plate 52 devoid of recess.

 We will now describe, with reference to Figures 1,3 and 6, the formation of a plateau. rous 12 around a mandrel formed by two parallelepipedic tubes 16.

 To do this, the flap 4 of the blank 1 of 12 in FIG. 1 is brought opposite, for example from below, laterally or above, from the face formed by the plane 50 (in phantom on the

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 Figure 6), formed by the lower faces 51 of the two tubes 16 of length greater than or equal to that of the main flaps.

 This step is carried out in a manner known per se, for example by means of a table or a movable belt, or also by means of a suction cup system.

 A coating of the blank flaps around the edges 17, 18, 19 and 20 is then carried out in a manner known per se by precise application of the fold lines on said edges during the coating. A certain flexibility in guiding the blank allows its precise adjustment on the mandrel during folding.

 The coating is carried out for example by means of a tilting arm. Pressing means (jacks, pushing plates) then firmly apply the tongue to the external face of the corresponding flap to bond it, in a manner known per se.

 Likewise, the flaps 10 and 11 are folded between the bars of the mandrel and the tabs 23 are glued to the underside of the lower flap (cf. FIG. 4).

 The plate is then ejected, in a manner known in itself from the mandrel, in the direction of the arrow, the slots 15 allowing the tubes of the mandrel to escape from the plate thus formed. The tray is then transported to the filling station. Its high training precision allows precise and adjusted filling of products in the holes. A U-shaped cap of the type described above is then, and for example, fitted on top of the products, without

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 risk of slipping due to embedding and precise adjustment.

 As is obvious and as also follows from the above, the present invention is not limited to the embodiments more particularly described. On the contrary, it embraces all the variants and in particular those where the mandrel is formed by four tubes, for example parallelepiped, and not two, that or each tube has more than four longitudinal edges, or even that or the branches of the U-shaped cap. descend to the plateau.

Claims (22)

 CLAIMS 1. Hole tray made of corrugated sheet material comprising a bottom wall, a side wall belt and an upper wall with holes, characterized in that at least one side wall is hollowed out at each of its lateral ends by at minus a lumen for passage of one or more edges of the mandrel for forming the plate around said edges.  2. Tray according to claim 1, characterized in that the side wall is entirely recessed on its lateral ends.  3. Tray according to any one of the preceding claims, characterized in that it is of parallelepiped shape.  4. Tray according to any one of the preceding claims, characterized in that two opposite side walls are hollowed out at their ends.  5. Tray according to any one of the preceding claims, characterized in that the external face of the bottom wall comprises recessed and / or projecting surface portions, suitable for allowing the embedding of one or more upper parts of products embedded in the holes in the tray.  6. Tray according to any one of the preceding claims, characterized in that it is produced from a blank comprising a series of four rectangular flaps, namely two main flaps suitable for respectively forming the wall <Desc / Clms Page number 16>  bottom of the tray and the upper wall with holes, and two secondary flaps suitable for forming two opposite side walls, said series being terminated by a fixing tab, and at least two side flaps arranged on either side of at least a main flap and capable of at least partially forming the two other opposite walls, called transverse, at least one of said transverse walls being the side wall hollowed out by lights at its ends, said plate being arranged to be mounted automatically by folding down the flaps and flaps around the edges of said mandrel, the end flap of the series of flaps and the tongue on the one hand, and the flaps and / or the adjacent main flap on the other hand, being fixed together by gluing to form the tray, the lights of the transverse wall allowing to clear the edges of the mandrel during the ejection of the tray.  7. Tray according to claim 6, characterized in that each main flap has two flaps.  8. Tray according to any one of claims 6 and 7, characterized in that each flap comprises on its peripheral edge at least one tab which is glued to the external face of the other main flap.  9. Tray according to claim 8, characterized in that the edge of the tongues has a shape complementary to a part of the periphery of the top of the products suitable for being embedded in the holes of the tray. <Desc / Clms Page number 17>  10. Tray according to any one of claims 1 to 8, characterized in that the upper wall of the tray comprises at least two rows of holes parallel to the adjacent opposite side walls, said side walls being connected and integral, in line with each hole , of a tab cut out in said upper wall during the formation of the corresponding hole, so that, when the plate is formed around the edges of the mandrel, the tabs remain in the plane of the corresponding side wall and stand perpendicular to the upper wall.  11. Tray according to any one of claims 1 to 8 and 10, characterized in that it further comprises a rectangular cap in inverted U, suitable for resting on the products embedded in the holes and / or on the upper end of the paws.  12. Tray according to claim 11, dependent on claim 8, characterized in that

 that the U-shaped cover is formed of a series of at least three flaps, one main flap forming a cover provided on either side, on its lateral edges, notches of shape complementary to that of the tongues, to ensure the wedging between trays stacked one on the other.  13. Tray according to any one of claims 11 and 12, for transport and packaging of products provided with thick covers, projecting laterally from the body of said products, characterized in that -a cap has at the lines of folding of the branches of the U, crushed or hollowed out areas to the portions of <Desc / Clms Page number 18>  tangency of the covers with the branches of the U, said zones being of shape complementary to that of the product cover portions.  14. Blank for the formation of a plate with holes, comprising a series of four rectangular flaps, namely two main flaps suitable for forming respectively the bottom wall of the plate and the upper wall with holes, and two secondary flaps suitable for forming two opposite side walls, said suite being terminated by a fixing tab, and at least two side flaps arranged on either side of at least one main flap and adapted to form at least partially the other two opposite walls, called transverse , at least one of said transverse walls being the lateral wall hollowed out by openings at its ends, characterized in that at least one lateral flap suitable for forming a lateral wall is hollowed out at each of its lateral ends by at least one passage light d 'an edge of the plate forming mandrel around said edges.  15. Blank according to claim 14, characterized in that each main flap has two flaps.  16. A blank according to any one of claims 14 and 15, characterized in that each flap comprises on its peripheral edge at least one tab capable of being glued to the external face of the other main flap.  17. A blank according to claim 15, characterized in that the edge of the tongues has a shape complementary to part of the periphery of the top <Desc / Clms Page number 19>  products suitable for being embedded in the holes in the tray.  18. Blank according to any one of claims 14 and 15, characterized in that the main flap suitable for forming the upper wall of the plate comprises at least two rows of holes parallel to the side flaps suitable for forming the adjacent opposite side walls, said flaps being connected and integral, at the right of each hole, with a tab cut out in said upper flap during the formation of the corresponding hole, so that, when the plate is formed around the edges of the mandrel, the tabs remain in the plane of the corresponding side wall and stand perpendicular to the upper wall.  19. Set of blanks comprising a blank according to any one of claims 14, 15 and 18, characterized in that it further comprises a blank capable of forming a rectangular cap in inverted U, suitable for resting on the products embedded in the holes and / or on the upper end of the legs.  20. Set of blanks according to claim 19, characterized in that the blank constituting the U-shaped cover is formed of a series of at least three flaps including a main flap forming a cover provided on either side, on its edges lateral, notches of shape complementary to that of the tongues, to ensure the wedging between trays stacked one on the other.  21. Set of blanks according to any one of claims 19 and 20, for transport and packaging of products provided with covers <Desc / Clms Page number 20>  of determined thickness, projecting laterally from the body of the said products, characterized in that the blank forming the cap comprises, at the level of the fold lines of the branches of the U, crushed or hollowed out areas with tangent portions of the covers with the branches of the U, said zones being of shape complementary to that of the product cover portions.  22. Method for forming a plate with holes around a mandrel comprising at least two spaced tubes to constitute at least four edges of the mandrel, from a blank comprising a series of four rectangular flaps, namely two main flaps suitable for respectively forming the bottom wall of the plate and the upper wall with holes, and two secondary flaps suitable for forming two opposite side walls, said series being terminated by a fixing tab, and at least two side flaps arranged on the side and d other of at least one main flap and capable of at least partially forming the other two opposite walls, called transverse, at least one of said lateral flaps being hollowed out at each of its lateral ends by at least one passage through a tube of the mandrel, characterized in that the blank is transferred opposite the mandrel, the portions of flaps and flaps being glued at the necessary locations , the flaps are wrapped around the mandrel, the flaps themselves being folded over the mandrel and pressed to be glued, like the flaps, <Desc / Clms Page number 21>  then the plate is ejected from the mandrel, the openings in the transverse wall making it possible to clear the edges of the mandrel when the plate is ejected.