WO2009024625A1

WO2009024625A1 - Method for manufacturing a compact cardboard tray and tray thus manufactured

Info

Publication number: WO2009024625A1
Application number: PCT/ES2007/000493
Authority: WO
Inventors: Pedro Teixidor Casanovas; Fernando Manuel CANALES CAÑAS
Original assignee: Videcart, S.A.
Priority date: 2007-08-22
Filing date: 2007-08-22
Publication date: 2009-02-26
Also published as: ES2371193B1; ES2371193A1

Abstract

Method for manufacturing a compact cardboard tray, which comprises five punched parts, with folding lines, flaps and sectors which in the various steps of the method are joined, folded and glued, until a final step involving the assembly and mounting of the tray, which has triangular cross-section, double-wall reinforcement columns in the corners and, slots and rims, also double-wall, for stacking.

Description

PROCEDURE PE OBTAINING A COMPACT CARTON TRAY AND TRAY OBTAINED

D E S C R I P C I Ó N

TECHNICAL FIELD OF THE INVENTION

The present invention relates to a method of obtaining a compact cardboard tray, which is constituted from five pieces, a bottom, two heads and two sides and is commonly used for the transport of fruits and vegetables.

BACKGROUND OF THE INVENTION

When designing a tray of the aforementioned type, a series of conditions that ensure an optimum level of performance must be taken into account, and in this sense the package must be resistant, manageable, allow a good presentation of the packaged product and finally be recyclable.

In the first aspect, that is to say in what refers to resistance, the container must withstand the weight of the contents without undergoing deformation of bulging in its bottom, it must withstand the static stacking so that it must have high compression capacity, depending on the weight to be contained and the required stacking capacity, must withstand dynamic stacking, that is the vibrations and movements to which it is subjected during handling and transport, and must also withstand the environmental conditions of handling, storage and transport, especially in the face of the effects of environmental humidity, which in the case of the cold rooms in which these types of trays are normally located reaches 90%.

In the second aspect, that is to say, of its manageability, the tray must offer the possibility of being assembled, as required by small users, or disassembled, as in the case of large users, who will have their own facilities where the use of simple, light machines and the greatest possible automation is desirable.

In the third aspect, the tray must offer optimum possibility of high quality printing, and finally, from the point of view of its recyclable nature, it must lack elements that damage this aspect, such as staples or other non-recyclable materials.

There are currently two basic types of trays for the transport of fruits and vegetables on the market, one in which wood is used as raw material, and another in which cardboard is used.

The trays of the first type, that is to say the wooden trays, although they satisfactorily meet the first objective of the aforementioned, the resistance one, do not meet any of the remaining ones, since it is neither manageable, nor does it offer the possibility of printing certain quality, and it is not recyclable at low cost.

Within the second group, multiple types of cardboard trays or other similar material are formed, generally formed from a conveniently stamped plate, with folding lines defining the bottom of the tray, from which wings are extended which, when assembling the tray, will constitute the faces thereof. This type of trays presents some manufacturing problems, given the complexity of the operations necessary to achieve the assembly thereof and the union between the adjacent ends of their faces at the corners of the tray.

In addition, the trays obtained are not sufficiently resistant to the compression efforts to which they will be subjected, when they are loaded with the merchandise and have to be stacked.

This weakness is due to the fact that in order to be able to make the complicated folds that such trays present, it is necessary to use cardboard that is easily manipulated, specifically corrugated cardboard, which in addition to offering a low structural resistance is highly absorbent of moisture, which is a deterioration practically immediate for the tray.

In many cases, to reinforce the tray, the application of additional reinforcement pieces, especially located in the corners, is used. The faces of the tray are also reinforced by means of tabs or wings folded on the faces themselves.

All this complicates and makes the manufacturing of the tray more expensive and, in most cases, it is not achieved that they have the desired resistance.

Another problem inherent in conventional single-piece structured trays, focuses on the fact that for the graphic printing on said trays, said tray deployed by the printing machine has to be passed entirely, even though the printing must be small or concentrate in a very small area of said tray. The corrugated cardboard boxes, of great diffusion, in addition to the aforementioned disadvantages, present another problem, which is that their construction requires the use of corrugated sheets of very thick cardboard, which, once the tray is assembled, limits or subtracts useful space for

The merchandise.

Trays for the transport of fruits and vegetables, compact cardboard, have been produced for a long time. Compact cardboard offers important advantages over corrugated cardboard. On the one hand it is more resistant

This allows the use of plates of less thickness to achieve the same mechanical resistance and, consequently, a better use of the useful space for the merchandise. On the other hand, the compact cardboard has a better resistance to moisture than the corrugated cardboard.

Examples of realization of compact cardboard trays can be seen in European patents EP 0573381 and EP 1184289. In the first of these patents are described trays consisting of three or more pieces of compact cardboard, timely punched, which are fixed by gluing to a bottom tray The corners are reinforced by sectors of the heads that are attached to the inner faces of the heads and sides of the tray.

In patent EP 1184289, a five-piece compact cardboard tray is described, in which the testers are first obtained, folding the end sectors that form the corner reinforcements and then such testers, together with the sides, are glued to the bottom of the tray.

These solutions, which are being used, present some drawbacks particularly at the production level, since some parts of the tray must be pre-assembled before being incorporated into the bottom thereof, which makes it difficult to automate the production process in all its phases, which is detrimental to the production rate. On the other hand, it was necessary to standardize the design of the integral parts of the tray to reach a maximum use of the space, achieving at the same time a robust tray capable of supporting all the efforts to which a tray of this nature is usually subjected in its transport and handling.

The object of the present invention is, therefore, a method of obtaining a compact cardboard tray, which starts from an optimized design of the three pieces that make up the tray, which in combination with an order and sequence of assembly of the pieces allows Total automation of the production process.

It is also the object of the present invention to achieve a highly structured tray, highly resistant to stress and with optimum use of space for loading.

DESCRIPTION OF THE INVENTION

The invention consists of a method of obtaining a compact cardboard tray comprising a bottom, two front and two sides, a process that is developed according to the following phases:

a) obtain by die cut sheets of compact cardboard intended to constitute tray bottoms. These die-cut sheets comprise longitudinal and transverse fold lines that are configured to form longitudinal and transverse flaps in said tray bottom. b) obtain by die-cut sheets of compact cardboard formed to constitute pockets, which comprise transverse folding lines that are configured to constitute a central body and a plurality of transverse sectors at each end of said central body.

c) obtain by die-cutting a plurality of sheets of compact cardboard formed to constitute sides, which comprise transverse folding lines that are configured to constitute a central body and an end sector on each side of the central body. It is provided that each side comprises a horizontal folding line that is located in the central body of said side and delimited by vertical cuts to constitute a longitudinal reinforcement flap, configured in such a way, that during the erection of the tray is adhered to one side of said side. Preferably, the longitudinal reinforcement flap, during the erection, will be adhered to the side of the side, which once mounted the tray is inside the same. With this reinforcement flap, the lateral resistance of the tray is increased in front of the possible pulls that it may suffer on its sides, also avoiding the bulging towards the outside of the sides, as a consequence of the pressure exerted by the content of the tray.

The bottom, front and side fold lines can be continuous creases that cause an expansion of the material on the opposite side of the crease. This special configuration of the folding lines, facilitates the operations of folding the pieces in the different sequences, including the erection of the tray.

d) dispensing a strip of glue on a first face of a tray bottom in correspondence with the transverse flaps of said bottom. Preferably, this face of the bottom where the tail is dispensed will be the face that once erected and assembled the tray, constitutes the inner face of the bottom tray, that is, the face of the tray on which the merchandise rests.

e) place a tester on each of said transverse flaps. As noted above, the transverse flaps are configured by transverse folding lines, in such a way that, optionally, when placing the testers on the transverse flaps of the bottom, an edge thereof reaches the transverse folding line, allowing so that the folding towards the inside of the tray, to achieve the erection thereof, is done in a guided way and precisely. The edge that is in contact with the transverse folding line and that turns the erection of the tray, is preferably straight.

f) Dispense a strip of glue in an area close to the transverse folding lines of the tester, on a face of the tester that once obtained the tray is inside the same. The tail strip will be dispensed in an area close to the cross section of the tester that is adjacent to the central body of said tester.

g) carry out the enveloping folding of the cross sections of the testeros by the transverse folding lines, so that the transverse sector furthest from the central body is superimposed on said central body, and adhered to said central body of the tester by the tail dispensed in phase f). This envelope folding determines tubular columns of triangular section. The tester may have three transverse folding lines, at each end of said tester, which define three transversal sectors. By folding these three cross sections a triangle is formed that will form each of the tubular columns of triangular section.

Tubular columns of triangular section, once mounted Ia tray, they are constituted in tubular columns of reinforcement to withstand the compression efforts that are produced by the stacking of the trays in their transport. Preferably, the triangular section of the tubular columns is an isosceles triangle. For this, when the transversal sectors are folded, the sector furthest from the central body of the tester that is attached to said central body, has a width smaller than that of the other two transversal sectors, so that the leg corresponding to that sector, is conforms with the sum of himself plus the expansion of cleft material.

h) dispensing a strip of glue on a second side of the tray bottom in correspondence with the longitudinal flaps of said bottom. Preferably, this face of the bottom where the tail is dispensed will be the face that once the tray is erected, forms the outside of the tray bottom and, therefore, the opposite side to where the heads have been attached.

i) place a side under each of the aforementioned longitudinal flaps of the bottom, which will be adhered to the bottom of the tray by the tail dispensed in phase h). As indicated above, the longitudinal flaps of the bottom are configured by longitudinal folding lines, in such a way that, optionally, by placing the sides in the longitudinal flaps of the bottom, an edge thereof reaches the longitudinal folding line. , thus allowing the folding into the tray, to achieve the erection thereof, is done in a guided and controlled manner. The edge that is in contact with the longitudinal folding line and that turns the erection of the tray, is preferably straight.

j) Dispense a glue on the side of each side, which once obtained the tray is inside the same, the said tail being dispensed in parallel strips at three levels, a first central strip that it extends along the central body and the extreme sectors, a strip below the central strip that extends to each end sector of said side, and a strip above the central strip that extends along each length extreme sector and a part of the central body. At the same time, to dispense a strip of tail in the transversal sector of each testero, which is closer to the central body of said testero. Preferably, as previously mentioned, the testator has three transversal sectors, therefore, the tail will be dispensed in the leg adjacent to the hypotenuse formed in phase g).

k) provoke the erection of the tray, lowering the front and side poles towards the first side of the bottom by the folding lines of the transverse and longitudinal flaps of the bottom, so that the front and side poles are perpendicular to the background. In this erection maneuver, the tail strips dispensed in phase j) produce the following effects:

• Union of tubular columns of triangular section to the ends of the central body of the side. This union is complemented and strengthened with the tail dispensed in the outer leg of the tubular column of triangular section.

• Union of the extreme sectors from the side to the end. Preferably the end sectors of each side have a surface that is configured to substantially cover half of the central body of the tester, such that during the erection of the tray, an end sector of one side covers half of the body of a tester and The other half is covered by the end sector of the side that is opposite the first. This In this way, the front ends, which are the ones that suffer the most in the handling and transport of the trays, have a double wall constituted by the front end and the two extreme sectors of the sides that cover it.

• Union of the longitudinal reinforcement flap from the side to the inner side of the side

The tail strips dispensed to make the gluing of the different pieces that make up the tray, can be continuous or discontinuous.

The invention also concerns the tray obtained by the aforementioned procedure, wherein a cross section of the tester has at least one tab, hereinafter sector tab, and at least one notch, hereinafter sector notch, being The sector tab on a first edge of said transverse sector and said notch being on a second edge, opposite the first edge, such that, in an upright position, the sector tab is located on the upper edge of the tester and the sector notch on the bottom edge of the tester. Said tab and said notch are located in the transversal sector closest to the central body of the tester and preferably, there is a sector tab and a sector notch in each of said transverse sectors.

Optionally, the tray has in the central body of the tester, at least one tab, hereinafter the body of the body, and at least one notch, hereinafter notch of the body of the body, said tab being mentioned on a first edge of the central body and said notch being mentioned in a second edge, opposite to the first edge, in such a way, that when the tray is in an upright position, the tester body flange is located at the upper edge of the tester and the notch of the body of testero at the bottom edge of the testero. Said tab and said notch are in the area close to the transverse folding lines of the tester and, preferably, the tray has a flange of a body of a body and a notch of body of a body on each side of the central body of the body. Therefore, this tab and this notch are adjacent to the sector tab and to the sector notch indicated above.

The end sectors of the sides of the tray have at least one flange, hereinafter lateral flange and, at least, one notch, hereinafter lateral groove, the lateral flange being on a first edge of said end sector and said groove being mentioned in a second edge, opposite the first edge, such that, when the tray is in an upright position, said flange is located on the upper edge of the side and said notch on the lower edge of the side. Said side flange and said side notch, are in an area of the end sector adjacent to the transverse folding line, so that they positionally coincide, after the erection of the tray, with the flange of the body of tester and the notch of body of testero forming a flange and a notch of double thickness. Preferably, the tray has a lateral flange and a lateral groove in each end sector.

Optionally, the tray also has in the central body of the side, at least one flange, from now on the flange of the lateral body and, at least, a notch, from the front of the lateral body, said flange being mentioned on a first edge of the central body and said notch being on a second edge, opposite the first edge, such that, when the tray is in an upright position, said tab is located on the upper edge of the side and said notch on the lower edge of the side. Said flange and said groove are in an area of the central body of the side adjacent to the transverse folding line, so that they positionally coincide, after the erection of the tray, with the flange of sector of testero and the notch of sector of testero, forming a flange and notch of double thickness. Preferably, the tray has a lateral body flange and a lateral body notch on each side of the central lateral body.

The configuration of the sector notch, the notch of the tester body, the lateral notch and the notch of the lateral body, can be trapecial and complementary to the sector flange, the flange of the tester body, the lateral flange and Ia lateral body tab, respectively.

The tray can have, at the bottom of the tray, a plurality of holes configured and arranged in such a way that in the mounting position they coincide with the position of the sector flange, the flange of the sector body, the flange of the side and the lateral body tab.

Said holes may extend to a part of the transverse flaps and a part of the longitudinal flaps. Preferably, each longitudinal and transverse flap has two holes. In such a way, that in the erection of the tray, the notches of the tester body and the lateral notches of the side are located in the holes of the transverse flaps, and in the longitudinal flaps the notches of the sector of the tester and the grimaces of the lateral body. The notches, as noted above, have a complementary configuration to the tabs Io which allows stacking of the trays. Once a tray is erect, the stacking of the trays is achieved by fitting the front body tab and the side tab in the respective faces of the upper box and the sector sector tab and the side body tab in the respective notches of the following tray. Since the tubular columns of triangular section are the parts of the tray that support the greatest weight when stacked, these two pairs of eyelashes in each corner, allow the stability, resistance and immobilization of the trays to be excellent.

DESCRIPTION OF THE DRAWINGS

To complete the description and in order to help a better understanding of the characteristics of the invention, in accordance with a preferred example of the realization of the same, a set of drawings is attached as an integral part of said description. Illustrative and not limiting, the following has been represented:

Figure 1. - Shows the bottom of the tray, obtained by die cutting, where you can see the folding lines and holes.

Figure 2. - It shows the testero of the tray, obtained by die-cutting, with its folding lines and its transversal sectors.

Figure 3. - Shows the side of the tray, obtained by die-cutting, where it is possible to observe the transverse folding lines and the horizontal folding line and the extreme sectors of said side.

Figure 4. - Shows the sequences of continuous assembly of the different pieces that make up the tray and the tray obtained. In these sequences, the tail strips dispensed in the different phases are observed.

Figure 5. - Shows the bottom of the tray with the tail strips dispensed in the transverse flaps. Figure 6. - Shows the pockets attached to the bottom of the tray.

Figure 7. - Shows the tail dispensed in an area close to the transverse folding lines of the tester and the beginning of the folding sequence of the transverse sectors of the testero.

Figure 8. - Shows the sides adhered to the bottom of the tray and the triangular tubular columns already formed.

Figure 9. - Shows the last phase of the assembly, prior to erection with the tail lines dispensed in that phase on the sides and in the triangular section tubular columns

Figure 10. - Shows a section of the tubular column of isoscelic section obtained by the enveloping folding of the transverse sectors of the tester.

Figure 11. - Shows the shaped tray.

PREFERRED EMBODIMENT OF THE INVENTION

In view of the figures, an example of a preferred embodiment of the invention can be observed, which consists in a method of obtaining a compact cardboard tray comprising a bottom (10), two heads

(20) and two sides (30).

Figure 1 shows the die cut piece that constitutes the bottom

(10) of the tray, said piece has a rectangular plan and is provided with longitudinal (13) and transverse (12) flaps, attached to the central body

(11) by the cleft classics, which constitute the fold lines longitudinal (15) and transversal (14).

The aforementioned cleavages are obtained in the same die-cutting operation of the bottom (10), by means of blunt leading edge blades, which originates the creasing without cutting the cardboard sheet. Said cleft, presents a recess by the line of attack of the blades and an expansion of material on the opposite side.

Figure 2 shows a front plan view of the tester (20), with the front face being the one that will remain inside the tray once it is assembled. In this figure it can be seen how the tester is a rectangular piece with an axis of transverse symmetry, which is composed of a central body (21) and three transversal sectors (23,24,25) on each side of the central body. The transversal sectors are connected to each other and to the central body (21) by clefts that constitute transverse folding lines (22).

At the two ends of the central body (21) of the tester (20) there are, on the upper edge, tabs (26 ') of trapecial geometry and on the opposite edge notches (27') of identical geometry and aligned with the eyelashes.

Also, in the cross section (25), adjacent to the central body (21), tabs (26) and at the opposite edge and aligned with the tabs, notches (27) are provided. The faces (27 'and 27) have the same shape and dimensions and, the same happens with the tabs (26' and 26) that also have the same geometry.

Figure 3 shows a front plan view of the side (30), that is, on the side of the side that once assembled the tray is inside

The same. Like the pockets (20), the side (30) is a die cut piece of rectangular plan with a transverse symmetry axis and is composed of two extreme sectors (33) attached to the central body (31) a through the continuous creasing that forms a transverse folding line (32).

Occupying most of the length of the central body (31) of the side (30), a longitudinal reinforcement flap (35) is defined delimited by two vertical cuts (38) and a longitudinal cleft that forms the longitudinal fold line (34 ).

At the ends of the central body (31) of the side there are, on the upper edge, tabs (36 ') of trapecial geometry and on the opposite edge grimaces

(37 ') of identical geometry and aligned with the tabs (36'). Likewise, in the extreme sectors (33) of the lateral one they are provided, in the upper edge, tabs (36) and in the opposite edge and aligned with the eyelashes (36), notches (37). The faces (37 and 37 ') have the same shape and dimensions and, the same happens with the tabs (36 and 36') that also have the same geometry.

Between the tester body tabs (26 ') there is a recess (28), also, between the side tabs (36) and the end of each end sector (33) there is a step (39) of identical height to the recess (28 ), so that once the extreme sectors (33) of the lateral to the central body (21) of the tester are superimposed, the recess (28) and the steps (39) define a window to allow the tray to be grasped or introduced by said window of the manipulation tool for the movement of the tray.

Each of these pieces, once stamped, is stacked manually in their respective warehouses, the fund store, the storage room and the side store.

The first of the pieces that are extracted by suction cups from its warehouse, is the bottom (10) that is deposited on a roller conveyor belt. Through this tape, the bottom (10) moves to the assembly station of the heads (20).

Once the bottom (10) is deposited in the conveyor, a strip of glue is dispensed on the inner face of said bottom in correspondence with the transverse flaps (12) of said bottom. The tail strip is dispensed while the bottom (10) is in motion on the conveyor belt, which must reach the position in which a treadmill is located. When the positioning cell detects that the bottom (10) has reached that position, the movement of the bottom (10) is stopped by lowering at that moment the treadmill on the bottom in order to fix it, that is to say that it does not move in the Next operation

When the bottom (10) is immobilized and positioned in the right place, suction cups extract the pockets (20) from the stockpile warehouse. The heads (20), as already mentioned, have two notches (27 ') on each side of the central body (21) and the bottom (10) has two holes (16) in each transverse flap (12), which It is configured by transverse folding lines (14). On each of these previously glued transverse flaps (12), a tester (20) is placed until the lower edge of said tester reaches the said folding line (14), matching the notch (27 ') of the tester ( 20) with the hole (16) at the bottom (10).

Once the pockets (20) are placed on the bottom (10) of the tray, a trampler acts on the pockets (20) so that said pockets (20) are perfectly fixed to the bottom (10).

Next, a tail strip is dispensed on the inner face of the tester (20), in an area close to the transverse sector (25) of the tester (20), and the enveloping folding of the transverse sectors (23,24,25) of the slats is carried out by the transverse folding lines (23), so that the transverse sector (24) is superimposed on the central body (21 ) of the tester, and adhered to said central body (21) by the tail dispensed in the area close to the transverse sector (25) of the tester. Because the tester (20) has three fold lines (23) on each side of said tester (20), by folding the three cross sections (23,24,25) on each side of the tester (20) it forms in each tester two triangles that constitute the four corners of the tray.

Once the corners of the tray are obtained, the bottom (10) is raised through a slightly inclined path of the conveyor belt to be able to dispense a strip of glue on the outer face of said tray bottom (10), in correspondence with the longitudinal flaps (13) of said bottom (10).

At this time, suction cups extract the sides (30) of the side storage and place a side under each of the aforementioned longitudinal flaps (13) of the bottom (10) previously glued. The sides (30) have two notches (37 ^! ) On each side and the bottom (10) has two holes (17) in each longitudinal flap (13), which is configured by longitudinal folding lines (15). Under each of these previously glued longitudinal flaps (13), a side (30) is placed until the lower edge of said side reaches the said folding line (15), matching the notch (37 ') of the side (30) with the hole (17) at the bottom (10).

The gluing of the sides (30) to the bottom (10) is done again, applying a trampler on the sides (30) that exerts prison on them and thus they are perfectly adhered to the bottom (10). _*

Next, three parallel tail strips are dispensed on the inner side of each side (30), a first central strip that extends along the central body (31) and the extreme sectors (33), a strip below of the central strip that extend to each end sector (33) of said side (30), and a strip above the central strip that extends along each end sector (33) and a part of the central body ( 31). At the same time a strip of glue is dispensed on the outer face of the cross section (25) of each tester (20).

The last phase of the procedure is to cause the erection of the tray, lowering the heads (20) and the sides (30) towards the inner side of the bottom (10) by the folding lines of the transverse (14) and longitudinal (15) flaps ) of the bottom (10), so that the heads (20) and the sides (30) are perpendicular to the bottom (10).

The erection station of the tray comprises a punch and a die inside which the punch is housed. The matrix has a shape that corresponds approximately with the outer shape of the tray to be obtained, while the punch has a shape that corresponds roughly with the inner shape of the tray. The matrix comprises a series of vertical surfaces configured to cause the folding of the heads (20) and the lateral ones (30) with respect to the longitudinal (13) and transverse fold lines (12) of the tray bottom.

When the erection of the tray occurs, each end sector (33) of the side covers half of the central body (21) of a tester (20) and the other half of this central body (21) is covered by the end sector (33 ) which is opposite the first.

The heads (20) have two tabs (28 and 28 ') and the sides

(30) have two other tabs (37 and 37 '), at the time of erection of the tray the tab (28 ') of the tester (20) coincides with the tab (37) of the side (30) and the tab (28) of the tester (20) and the tab (37') of the side coincide.

During the erection maneuver of the tray, the corners are adhered to the aforementioned strips. Also, during the erection of the tray, thanks to the tail strips dispensed in this phase, the end sectors (33) of the sides (30) will be attached to the heads (20). The central strip is the one that makes it possible, that during the erection, the longitudinal reinforcement flap (35) of the lateral one (30), is adhered to the inner face

(31) of said lateral (30).

Claims

1. Procedure for obtaining a compact cardboard tray comprising a bottom (10), two heads (20) and two sides (30), characterized in that it comprises the following phases:

a) obtain die-cut cardboard sheets formed to constitute tray bottoms, comprising longitudinal (15) and transverse (14) folding lines configured to form longitudinal (13) and transverse (12) flaps;

b) obtain by die-cut cardboard sheets formed to constitute pockets, comprising transverse folding lines (22), configured to constitute a central body (21) and a plurality of transverse sectors at each end of the central body (21);

c) obtain by die-cut cardboard sheets formed to constitute laterals, comprising transverse folding lines (32) configured to constitute a central body (31) and an end sector (33) to

. each side of the central body (31), and comprising a horizontal folding line (34) located in the central body

(31) of said lateral and delimited by vertical cuts (38), to constitute a longitudinal reinforcement flap (35), configured in such a way, that during the erection of the tray it is adhered to a face of said lateral one; d) dispensing a strip of glue on a first face of a tray bottom (10) in correspondence with the transverse flaps (12) of said bottom (10);

5 e) place a tester (20) on each of the transverse flaps (12) of the bottom (10) and dispense a tail strip in an area close to the transverse folding lines (22) of the tester (20), in a face of the tester that once obtained the tray is inside said tray;

f) carry out the enveloping folding of the transverse sectors of the heads by the folding lines (22), so that the transverse sector furthest from the body

15 central (21), is superimposed on said central body

(21), and adhered to the central body of the tester (21) by the tail dispensed in phase e) configuring the enveloping folding of the transverse sectors tubular columns of triangular section;

20 g) dispensing a strip of glue on a second face of said tray bottom (10) in correspondence with the longitudinal flaps (13) of said bottom (10);

25 h) place a side (30) under each of the aforementioned longitudinal flaps (13), which will be adhered to the bottom (10) of the tray by the tail dispensed in phase g);

30 i) dispense a tail on the side of each side

(30), that once obtained the tray is inside of the same, the said tail being dispensed in strips parallel to three levels, a first central strip that extends along the central body (31) and the extreme sectors (33), a strip below the central strip that is extends to each end sector (33) of said side (30), and a strip above the central strip that extends along each end sectors (33) and a part of the central body (31);

j) dispensing a strip of glue in the cross section of each tester (20) that is closest to the central body (21) of said tester;

k) cause the erection of the tray, lowering the heads (20) and the sides (30) towards the first face of the bottom (10), by the folding lines of the transverse (12) and longitudinal (13) bottom flaps of the bottom (10), so that the heads (20) and the sides (30) are perpendicular to the bottom (10).

2. Procedure for obtaining a compact cardboard tray according to claim 1, characterized in that in the erection maneuver of the tray the tubular columns of triangular section are adhered to the tail strips dispensed in phase i).

3. Procedure for obtaining a compact cardboard tray according to claim 2, characterized in that in the erection maneuver the extreme sectors (33) of the sides (30) are adhered to the heads (20) by the tail strips dispensed in The phase i).

4. Procedure for obtaining a compact cardboard tray according to any of the preceding claims, characterized in that during the erection the longitudinal reinforcement flap (35) of the side (30), is adhered, by the central tail strip dispensed in phase i), to a side of the side (30 ), that once mounted the tray is inside it.

5. Method of obtaining a compact cardboard tray according to any of the preceding claims, characterized in that the end sectors (33) of each side (30) have a surface that is configured to substantially cover half of the central body (21) of ! testero (20), in such a way that during the erection of the tray, the testeros (20) are covered by the aforementioned extreme sectors (33).

6. Procedure for obtaining a compact cardboard tray according to any of the preceding claims, characterized in that the folding lines are continuous creases that cause an expansion of the material on the opposite side of the crease.

7. Method for obtaining a compact cardboard tray according to any of the preceding claims, characterized in that when folding occurs, the expanded area of the crease is located at the interior angle of the folding.

8. Tray obtainable from the above procedure, according to any of the preceding claims, characterized in that the tester comprises three cross sections (23,24,25) that constitute a tubular column of isoscelic triangular section.

9. Tray obtainable from the previous procedure, according to any of the preceding claims, characterized in that a cross section of the tester has at least one sector flange (26) and the less a sector notch (27), the sector tab (26) being on a first edge of said transverse sector and said notch (27) being on a second edge, opposite the first edge in such a way, that in an upright position , The sector tab (26) is located on the upper edge of the tester (20) and the sector notch (27) on the lower edge of the tester, and because said tab and said notch are in the nearest transverse sector to the central body (21) of the tester (20).

10. Tray obtainable from the above procedure, according to claim 9, characterized in that the central body (21) of the tester (20) has at least one tester body flange (26 ') and at least one notch of the tester body ( 27 '), said tab being on a first edge of said central body (21) and said notch being on a second edge, opposite to the first edge, such that the tray being in an upright position, the body tab of testero (26 ') is located at the upper edge of the testero (20) and the notch of the tester body (27') at the lower edge of the testero (20) and because said tab and said notch are in the area next to the transverse fold lines (22) of the tester (20).

11. Tray obtainable from the previous procedure, according to any of claims 1-8, characterized in that the end sectors (33) of the sides (30) have at least one lateral flange (36) and at least one lateral groove (37 ), the lateral flange (36) being on a first edge of said end sector (33) and said notch being on a second edge, opposite the first edge, such that, being the tray in an upright position, said flange It is located on the upper edge of the side and said notch on the lower edge of the side and because said side flange (36) and said side notch (37) are in an area of the end sector (33) adjacent to the line cross folding

(32), in such a way that they positionally coincide, after the erection of Ia tray, with the tab of the body of the body (26 ') and the notch of the body of the body (27') forming a flange and an operating notch of double thickness.

12. Tray obtainable from the previous method, according to claim 11, characterized in that the central body (31) of the lateral (30) has at least one lateral body flange (36 ') and at least one lateral body notch (37 '), said tab being on a first edge of the central body (31) and said notch being on a second edge, opposite the first edge, such that, when the tray is in an upright position, said tab remains located on the upper edge of the side and said notch on the lower edge of the side, and because said tab and said notch are in an area of the central body (31) of the side (30) adjacent to the transverse folding line (32), in such a way that they positionally coincide, after the erection of the tray, with the sector flange (26) of the tester and the sector notch (27) of the tester, forming a flange and operative notch of double thickness.

13. Tray obtainable from the previous procedure, according to any of claims 9-12, characterized in that the sector notch (27), the notch of the body of the tester (27 '), the lateral notch (37) and the notch of the lateral body (37 '), they have a complementary configuration to the sector flange (26), the flange of the tester body (26 ^! ), the lateral flange (36) and the flange of the lateral body (36'), respectively.

14. Tray obtainable from the previous procedure, according to any of claims 8-11, characterized in that the sector notch (27), the notch of the body of the head (27 '), the side notch (37) and Ia Notch of the lateral body (37 '), have a trapecial configuration.

15. Tray obtainable from the previous procedure, according to any of the preceding claims, characterized in that the tray bottom (10) comprises a plurality of holes configured and arranged in such a way that in the mounting position they coincide with the position of the sector tab (26), the sector body tab (26 ¹ ),

The lateral flange (36) and the lateral flange (36 ').

16. Tray obtainable from the previous procedure, according to claim 15, characterized in that said holes extend to a part of the transverse flaps (12).

17. Tray obtainable from the previous method, according to claim 16, characterized in that said holes extend to a part of the longitudinal flaps (13).