FR2752219A1 - Large sized crate made from corrugated cardboard blank - Google Patents

Abstract

The crate is made from two identical cardboard blanks (2,2') each having two rectangular flaps (3,3,4,4'). The flaps are connected together by parallel folding lines (5,5'). Side flaps (7,7') are connected to one side of the first flaps by second folding lines (6,6') perpendicular to the first folding lines. The side flaps have a double folding line (9,9') biased at 45 deg. from one end of the second folding line junction with the first flap. The double line defines a triangular end portion (10,10') with the first flap. A second trapezoidal flap (8,8') has a side (11,11') biased at 45 deg. so as to be opposite the double folding line during formation of the crate, the flaps automatically forming the bottom of the crate.

Description

PROCESS, BLANK AND HALF-BLANKS OF SHEET MATERIAL
FOR THE REALIZATION OF A CAISSE DE GRANDES
DIMENSIONS
The present invention relates to a method for producing a case from a blank or from two separate half-blanks of sheet material, in particular of corrugated sheet, each half of blank or each half-blank being of the type comprising an identical series of rectangular shutters linked in pairs by first fold lines parallel to each other, and a set of lateral flaps connected on one side of the body by second fold lines perpendicular to the first fold lines and suitable for form an automatic background for the body.

 By automatic bottom is meant a bottom which is automatically shaped when one separates from one another the two suites of shutters to give its volume to the body and the component flaps of which automatically return to flatten one against the other when the box is folded back on itself, for example for transport or storage.

 The invention also relates to blanks and half-sheets of the type defined above. The invention finds a particularly important, although not exclusive, application in the field of manufacturing rectangular boxes made of corrugated cardboard or equivalent of large dimensions, for example of dimensions greater than 800 mm × 1 m.

 Methods are already known for producing large-sized parallelepiped boxes from half-blanks.

 They consist in forming the boxes manually, possibly around a template suitable for keeping perpendicular two adjacent sides of the box to be formed.

 The two suites of shutters are glued to one another by an operator, the box formed having a semi-automatic type bottom or of the type known under the name American box suitable for being formed and folded manually.

 Such methods have drawbacks. They are slow because they are not easy to implement in the case of a large body.

 They also require a great deal of labor time, which is costly, and in practice exclude the production of an automatic bottom case.

 The present invention aims to provide a process, a blank and a half blank which respond better than those previously known to the requirements of practice, in particular in that it allows the automatic production of large boxes which may have an automatic bottom, reliably, quickly and perfectly repetitively, at minimal cost.

 With the method of the invention it is for example possible, with a single operator, to produce several tens of large boxes per hour.

 To this end, the invention proposes in particular a method for producing a case from a blank or from two identical half-blanks of sheet material, each half of blank or each half-blank comprising a series of at least two shutters, rectangular, namely a first shutter and a second shutter, said shutters being connected to each other by first fold lines parallel to each other, and comprising a set of lateral flaps connected to one side of said suite by seconds fold lines perpendicular to the first fold lines, namely a first rectangular or substantially rectangular flap comprising a double bias fold line at 450 from one end of the second fold line joining with the first flap, defining a triangular end portion of first flap, and a second trapezoidal flap having a bias side at 450 arranged to be opposite the double line of pl iage of one of said triangular portions during the formation of the box, said flaps being able to form the bottom of said box, characterized in that - the two halves of the blank or the two half-blanks are glued at determined locations of their ends, to allow the fixing necessary for the realization of the box, - the two blank halves or the two half blanks forming a blank extended entirely flat, the end flaps are folded inwards and the blank on itself, by applying the ends of said blank to each other, the flaps being arranged outside the flaps, the double fold lines of the first flaps coinciding with the oblique sides of the second flaps, then - the triangular end portions of the first two flaps are folded around the oblique sides of the second flaps facing each other, coinciding with the double fold lines, and said ports are applied NS triangular end on the outer face of said second flaps.

 The invention also proposes a blank or a set of half-blanks for an automatic cash register, made of a sheet of cardboard or corrugated cardboard, each half of blank or each half-blank comprising a series of at least two rectangular flaps, namely a first flap and a second flap, said flaps being interconnected by first fold lines parallel to each other, and comprising a set of lateral flaps connected to one side of said series by second fold lines perpendicular to the first fold lines , characterized in that the set of side flaps comprises a first rectangular or substantially rectangular flap comprising a double fold line at an angle at 450 from one end of the second fold line joining with the first flap, defining a triangular end portion of first flap, and a second trapezoidal flap having a biased side, 45 "from the second e fold line junction with the second flap, said flaps being adapted to form the bottom of said box.

 In an advantageous embodiment, the double fold lines are biased from the end of the second fold line located on the side of the second flap, the bias side of the second flap being located on the side of the first flap.

 In another advantageous embodiment, the double fold lines are biased from the end of the second fold line situated on the side opposite to the second flap, the bias side of said second flap being situated on the side opposite to the first Rabat.

 Advantageously, the blank consists of two identical half blanks, interconnected by end tabs by gluing.

 In an advantageous embodiment, the second trapezoidal flaps are rectangular.

The invention will be better understood on reading the following description of a particular embodiment given by way of non-limiting example. The description refers to the accompanying drawings in which
Figure 1 is a schematic perspective view of the first three steps of the method of forming a box from two half-blanks according to a first embodiment of the invention.

 Figure 2 is a perspective view of the following steps of the embodiment of the invention more particularly described here.

 Figure 3 is a plan view of two half blanks according to the embodiment of the invention more particularly described.

 FIGS. 1 and 2 show in perspective the stages of the process for manufacturing a case, from two identical half-blanks 2, 2 ′ of double-sided corrugated cardboard, for example 3 mm thick and of large dimensions, for example 1,200 x 1,000 x 1,200 mm.

 Each half blank has two rectangular flaps, namely a first flap 3, 3 'and a second flap 4, 4', connected together by a first fold line 5, 5 ', and connected to a set of flaps by second fold lines 6, 6 ', perpendicular to the first lines 5, 5', namely a first flap 7, 7 ', connected to the first flap 3, 3' and a second flap 8, 8 'connected to the second flap 4, 4 '.

 The first flap 7, 7 'is substantially rectangular and is provided with a double fold line 9, 9' at an angle forming a triangular end portion 10, 10 'one of the angles of which is located on the second fold line 6 , 6 '.

 Only one blank will be described below, the two half-blanks 2, 2 'being identical.

 The second flap 8 of the half blank 2 is of substantially trapezoidal shape and has a biased edge or side 11, symmetrical with respect to the extension of the first fold line 5, with the double fold line 9 of the adjacent flap.

 The half blank also includes a bonding tab 12, connected to the lateral side of the first flap, parallel to the first fold line.

 Referring to Figure 1, the first blank 2 is flat and for example placed automatically or manually on a work surface 13 in a position determined by stops (not shown).

 The top of the tongue 12 is then glued by first gluing means (not shown).

 These means comprise, for example, a glue gun or applicator of liquid glue under pressure, in the form of three fine parallel cords, all along the tongue, connected in a manner known per se to a reservoir for preparing and storing the glue. liquid.

 The second blank 2 'is then deposited automatically and precisely on the tongue 12, the end edge 14' of the blank 2 'coming to be superimposed parallel and precisely to said tongue 12.

 To do this, the blank 2 ′ can for example be placed on support rails in a plane 17 slightly above the plane 13, with wedging in a determined position as for the half blank 2, the application then being made by vertical lifting of the plane 13 (arrow F in FIG. 1) until contact between edge and tongue.

 The tongue and the edge are then pressed one against the other to make the bonding, for example thanks to a retractable counter blade (not shown) to form the assembly 15 of FIG. 1, equivalent to a blank with four shutters made in one piece, to which the method of the invention is also perfectly applicable.

 The tongue 12 ′ and the triangular end portions 10 and 10 ′ are also glued from above, as described above.

 The blank thus reconstituted and glued is then brought into the folding position 16.

 To do this, the blank is, for example, slid horizontally on lateral guide and support rails (not shown) situated in the plane 17, until the flaps 3 ′ and 4 are opposite folding means (not shown). ).

 The positioning accuracy of the half blanks laterally and longitudinally relative to the folding device can be approximate, for example to one or more millimeters. The lateral stops of the guide rails allow a certain amount of play to avoid significant friction and allow prior sliding to the folding station.

 The longitudinal displacement of the half-blanks being moreover and for example limited by abutment means, they stop approximately opposite said folding means, due to the inertia, the drive means then moving backwards to come look for the following solid half-blanks.

 The glue lines on the elements 12 ', 10 and 10' can also be applied when moving to the locations provided in a programmed manner.

 Folding is carried out by folding arms belonging to a mobile assembly (not shown) in a manner known in itself.

 The tongue 12 'is applied precisely on the end edge 14 of the flap 4 to form the blank 18 folded on itself (see FIG. 2).

 According to the invention, the flaps 7, 7 ', 8, 8' are then in a position entirely directed towards the outside of the flaps, in the plane and in the extension of said flaps.

 The triangular end portions 10 and 10 ′ are then folded around the biased sides 11, 11 ′ of the second flaps by folding said portion 10 upwards, and said portion 10 ′ downwards, around their double fold line. , and by applying horizontally, from above and from below, said portions on the external faces of the second flaps, with which they are pressurized, for example via retractable counterblades (not shown).

 The blank thus folded up is then ejected when the next blank arrives, for example directly on a pallet. It is then ready for storage and / or transport.

 Its shaping is done by manual spacing of the walls of the box as shown in 19 in FIG. 2.

 The box thus unfolded is advantageously fixed on a wooden pallet, for example by stapling the flaps on the wooden crosspieces of the pallet.

 We will now describe more precisely the half-blanks 2 and 2 'for an automatic bottom crate according to the embodiment more particularly envisaged, with reference to FIG. 3.

 FIG. 3 shows two identical half-blanks 2, 2 ′, made of double-sided corrugated cardboard.

 Only one blank is described below.

 As we have seen, each blank 2 has two rectangular flaps 3 and 4, namely a first rectangular flap, for example square, 3 and a second rectangular flap 4, of smaller width, and connected to one side of the first flap by a first fold line 5.

 The half blank also has an end tab 12 connected to the other side of the first flap 3 by a fold line parallel to the first fold line 5.

 Each flap 3 and 4 has a flap, namely a first substantially rectangular flap 7 connected to the first flap by a first second fold line 6, and a second flap 8 connected to the second flap by a second second fold line 6 aligned with the first second fold line 6.

 The first flap 7 comprises a double fold line 9, constituted by two simple fold lines, parallel, spaced from each other by a distance e, equal or substantially equal to the thickness of the corrugated cardboard, at an angle from the end 61 of the second fold line 6, on the side of the second flap 8, at a determined angle a with said second fold line. The angle a is equal to or substantially equal to 45.

 The groove of the grooves formed by these double folds is also located on the same side as the groove of the groove of the second fold line, relative to the plane of the flap.

 The first flap 7 also comprises two lateral sides 71 and 72, free, a little oblique towards the inside of the flaps, to facilitate mounting.

 The second flap 8 has a biased side or edge 11 from the common end 61 between the second fold lines, also at the angle a with respect to the second fold line 6.

 More precisely, the edge 11 is symmetrical relative to the extension 5a of the first fold line 5, with the double fold line 9 of the adjacent flap.

 The other side 81 situated opposite the first flap is for example perpendicular, at least partially on the side of the second fold line, with said second fold line 6.

 As is obvious and as it follows from the above, the present invention is not limited to the embodiments more particularly described, but it also relates, in particular - to the case where the half-blank has more than two flaps, - the case where the fold line starting at an angle, of the half-blank with automatic bottom, is located on the side opposite to the second flap, the oblique side of the second flap then being situated towards the outside, - the case where the bonding tab is wide, and can be compared to a shutter, - the case where the two half-blanks are the two halves of the same initial blank.

Claims (7)

 1. Method for producing a case from a blank or from two identical half-blanks (2, 2 ′) of sheet material, each half of blank or each half-blank comprising a series of at least two rectangular flaps, namely a first flap (3, 3 ') and a second flap (4, 4'), said flaps being interconnected by first fold lines (5, 5 ') parallel to each other, and comprising a set of lateral flaps connected to one side of said series by second fold lines (6, 6 ') perpendicular to the first fold lines, namely a first flap (7, 7') rectangular or substantially rectangular comprising a double line of folding (9, 9 ') at an angle of 450 from one end (61) of the second folding line joining with the first flap, said double line defining a triangular end portion (10, 10') first flap, and a second trapezoidal flap (8, 8 ') having a biased side (11, 11') at 450 arranged to be in front of said double fold line during the formation of the box, said flaps (7, 7 ', 8, 8') being suitable for forming the automatic bottom of said box, characterized in that - the two halves of the blank or the two half-blanks are glued at predetermined locations at their ends, to allow the fixing necessary for the production of the box after folding, - the two halves of the blank or the two half blanks forming a blank extended entirely flat, the end flaps (4, 3 ') are folded inwards and the blank is closed on itself, applying the ends of said blank one on the other, the flaps being arranged outside the flaps, the double fold lines (9, 9 ') of the first flaps coinciding with the oblique sides of the second flaps, then - the triangular end portions (10, 10') are folded ) of the first two flaps around the diagonal edges (11, 11 ') flaps facing each other, coinciding with the double fold lines (9, 9 ') and they are applied to the external face of said second flaps.  2. Method according to claim 1, characterized in that the box is formed from two identical half-plates (2, 2 ').  3. blank or set of two half blanks (2, 2 ') of cardboard or corrugated cardboard material, each blank half or each blank comprising a series of at least two rectangular flaps, namely a first flap (3, 3 ') and a second flap (4, 4'), said flaps being interconnected by first fold lines (5, 5 ') parallel to each other, and comprising a set of lateral flaps connected to a side of said series by second fold lines (6, 6 ') perpendicular to the first fold lines, characterized in that the set of side flaps comprises a first flap (7, 7') rectangular or substantially rectangular comprising a double 450 fold bias line from one end of the second fold line (6) joining the first flap, and a second trapezoidal flap (8, 8 ') having a bias side at 450 relative to the second fold line joining the second flap, said flap s being suitable for forming the bottom of said box.  4. Blank or set of half blanks (2, 2 ') according to claim 3, characterized in that the double fold lines (9, 9') are oblique from the end (61) of the second fold line, said end being located on the side of the second flap (8, 8 '), the bias side (11, 11') of the second flap (8, 8 ') being located on the side of the first flap.  5. Blank or set of half blanks according to claim 3, characterized in that the double fold lines are oblique from the end of the second fold line, said end being situated on the side opposite to the second flap, the bias side of said second flap being on the side opposite the first flap.  6. Blank according to any one of claims 3 and 4, characterized in that it consists of two identical half blanks, interconnected by tabs (15, 15 ') end by bonding.  7. Blank according to any one of claims 3 to 6, characterized in that the second trapezoidal flaps are rectangular on one side.