FR3094916A1 - CORRUGATED CARDBOARD - Google Patents

Abstract

CORRUGATED CARDBOARD [The invention relates to a corrugated cardboard element comprising: - a flat sheet of paper, called a flat sheet (11), - a first sheet of corrugated paper (21) glued to the flat sheet, - a second sheet of fluted (22) whose flutes are embedded in the flutes of the first sheet of fluted paper. Figure for abstract: Figure 2]

Description

CORRUGATED CARDBOARD

The invention relates to the field of corrugated cardboard.

A corrugated cardboard element comprises one or more sheets of corrugated paper, each corrugated sheet being glued to one or between several sheet(s) of flat paper(s). We know in particular:
- single-sided corrugated cardboard, simply comprising a fluted sheet and a flat sheet glued together,
- double-sided corrugated cardboard, comprising a fluted sheet sandwiched between two flat sheets to which it is glued,
- double-double-sided corrugated cardboard (also called double fluted) comprising three flat sheets sandwiching two fluted sheets, etc.

Double-sided, double-double-sided corrugated boxes are rigid and stored flat. In contrast, single-sided corrugated cardboard is stored in rolls.

Single-sided corrugated cardboard can, because of its flexibility, be used as a separating and/or wedging element, for example to hold and/or separate items packaged in a package, or even to protect fragile items (such as biscuits) packaged in flexible packaging (plastic sheet).

To do this, for example, a portion of a roll of single-sided corrugated cardboard is cut and this portion is positioned between two articles, or around an article, so as to form a protective wall for this or these articles. .

There is a need for a material with more packaging possibilities.

A corrugated cardboard element is proposed comprising:
- a flat sheet of paper, called a flat sheet,
- a first sheet of fluted paper glued to the flat sheet,
- a second sheet of fluted paper whose grooves are embedded in the grooves of the first sheet of fluted paper.

These three sheets are superposed, the first corrugated sheet being between the flat sheet and the second corrugated sheet.

Thus, in the absence of bonding between the first and the second corrugated sheet, the second corrugated sheet can be easily detached from the assembly formed by the first corrugated sheet and the flat sheet.

Provision can therefore be made to detach the second fluted sheet from the rest of the corrugated cardboard element only on a first portion, and to leave the first and second fluted sheets nested on a second portion, which offers new packaging possibilities.

The second sheet of corrugated cardboard at the first portion could for example be used to surround a first article, while the son element comprising the first corrugated sheet and the flat sheet could be wrapped around a second article and the second portion, with three thicknesses, serves as a separation between two other articles.

This corrugated cardboard element can also be advantageous because of its compactness during storage, in particular with respect to the storage space which would be necessary to store a single-sided corrugated cardboard and the second corrugated sheet.

This corrugated cardboard element can advantageously be stored in a roll, or alternatively flat.

Advantageously and in a non-limiting way, the corrugated cardboard element can also comprise an additional sheet of flat paper, glued to the second corrugated sheet.

The corrugated cardboard element is thus in the form of a rigid plate with (at least) four thicknesses:
- the flat sheet, called the first flat sheet,
- the first fluted sheet glued to the first flat sheet,
- the second corrugated sheet whose corrugations are embedded in the corrugations of the first corrugated sheet, and
- the additional flat sheet of paper, called the second flat sheet.

The first fluted sheet is between the first flat sheet and the second fluted sheet.

The second fluted sheet is between the first fluted sheet and the second flat sheet.

The corrugated cardboard element can thus be separated into two son corrugated cardboard elements, one comprising the first flat sheet and the first fluted sheet glued together, and the other comprising the second flat sheet and the second fluted sheet glued between them.

These two son elements obtained by separation of the four-ply plate can therefore be single-sided corrugated cardboard elements, or alternatively elements with more thicknesses if the original plate also comprises additional sheets.

Thus, if the fluted sheets are only detached from each other on a portion of the plate, a material is obtained with a rigid portion, with four thicknesses (at least), and a portion with two elements of wire corrugated cardboard, for example two single-sided corrugated cardboard.

This can allow new possibilities of use, in particular as regards separation/wedging of articles during their packaging. The same element combines a rigid part (with at least four thicknesses) and flexible daughter parts.

If the four-ply corrugated cardboard sheet is completely separated into two single-sided corrugated cardboards, the invention is also advantageous in the sense that it makes it possible to obtain these two single-sided corrugated cardboards more quickly than in the prior art, and with fewer storage constraints.

In fact, it is possible to obtain twice the length of wedging element for the same passage of the corrugator.

The two single-sided corrugated cardboard wires can then be rolled up, or not.

The four-ply corrugated cardboard element can be stored more compactly, flat, than two rolls of single-sided corrugated cardboard. You can get a factor of two or three in terms of space saving.

The corrugated cardboard element, in plate form, can easily be transformed like a standard corrugated cardboard plate.

In particular, we can define fold lines on the plate, fold the plate, glue it, print it, cut it, etc.

The outer sheets can thus be printed downstream of the corrugator, which would have been tricky to carry out in the case of direct manufacture of single-sided corrugated cardboard.

In one embodiment, a linear element may be provided between the corrugated sheets, to facilitate their separation, for example a strip capable of being pulled (“tear tape”). One can for example provide a plastic strip a few millimeters wide (for example between 6 and 12 millimeters wide).

This linear element can advantageously extend along a direction having a component normal to the longitudinal direction of the grooves, corresponding, for example, to the unwinding direction of the corrugator.

In one embodiment, the first and/or the second corrugated sheet(s) is(are) printed before gluing, on the face opposite to the face glued to the first and/or second sheet(s). ) plane(s), respectively.

In one embodiment, the corrugated cardboard element may further comprise a third sheet of fluted paper glued to the face of the second flat sheet opposite the face of this second flat sheet glued to the second fluted sheet. In other words, the second flat sheet is glued by one of its faces to the second corrugated sheet, and by the other of its faces to the third corrugated sheet.

Separating the first corrugated sheet from the second then results in, on the one hand, a wire corrugated cardboard element comprising the first flat and fluted sheets (for example a single-sided element), and, on the other hand, in a wire corrugated cardboard element with ( at least) three thicknesses, comprising two fluted sheets on either side of a flat sheet.

In one embodiment, an additional flat sheet can be glued to the free face of the third corrugated sheet.

Alternatively, a fourth corrugated sheet can be provided, the corrugations of which are embedded in the corrugations of the third corrugated sheet.

In one embodiment, it is possible to provide a third flat sheet glued to the fourth corrugated sheet.

The corrugated cardboard can then be separated into three wire elements, namely two wire corrugated cardboard elements, for example single-sided (including in particular the first and the third flat sheet, respectively), and a wire corrugated cardboard element with (at least ) three thicknesses, comprising two fluted sheets on either side of a flat sheet.

The two single-sided wire corrugated and the three-ply wire corrugated can be wound into three rolls, or not.

The corrugated cardboard can for example be used to form a spacer for wedging bottles. The invention makes it possible to store this spider in a particularly compact form. In addition, the brace thus obtained can combine flexible parts and rigid parts, of adjustable lengths.

It will be noted that the first and the third grooved sheets may have different grooves. For example, the first and second fluted sheets can define B flutes, while the third and fourth fluted sheets can define E flutes. identical.

There is further provided a method of manufacturing a corrugated cardboard element, comprising:
- superimpose two flat sheets of paper and feed a passage between two fluted cylinders with said superimposed flat sheets, so as to obtain a first and a second fluted sheets whose flutes are embedded between them,
- glue an additional flat sheet of paper to the first fluted sheet.

The corrugated cardboard element can thus be obtained with an existing corrugator, without it being necessary to adapt it considerably.

Advantageously, the glue is deposited by means of a coating cylinder, coated with glue. Advantageously, the bonding is carried out by means of a bonding cylinder, for example smooth.

Advantageously and in a non-limiting manner, provision may be made to glue a second flat sheet of paper to the second corrugated sheet.

In an advantageous embodiment, at least one side edge of the first corrugated sheet is below the at least one corresponding side edge of the first flat sheet and the at least one corresponding side edge of the second corrugated sheet. It is possible to provide a second fluted sheet wider than the first, and/or offset it in the longitudinal direction of the flutes.

Thus, the bonding leads to bonding at least one lateral end edge of the first flat sheet to at least one corresponding lateral end edge of the second corrugated sheet. This joining edge of the first flat sheet to the second corrugated sheet is then removed ("trim"), for example by cutting. This temporary joining can make it possible to ensure better retention of these three sheets on a corrugator.

Advantageously, it is the two lateral edges of the first corrugated sheet which are each below the corresponding lateral edge of the first flat sheet and the corresponding lateral edge of the second corrugated sheet. The first corrugated sheet is narrower than the first planar sheet and the second corrugated sheet. Thus, the first flat sheet can be joined to the second fluted sheet on two joining edges, which can then be eliminated.

Provision can advantageously be made for the two sheets intended to define the grooves to be rolled up superimposed, in the same roll, upstream of the corrugated rolls.

This roller is used to feed the passage between the splined rolls.

When this roller is empty, another roller can also be used with two superimposed sheets, thus making it possible to avoid the stoppage which would occur if these two rollers were used simultaneously, to each supply a single sheet.

Alternatively, provision can be made for each sheet intended to be corrugated to be wound on a corresponding roll. Two-roller installations can be used to feed the passage between the fluted rolls without prior preparation of the rolls.

It is further proposed to use the corrugated cardboard element as described below as a separating element and/or wedging of articles packaged in a packaging.

The invention is now described with reference to the accompanying, non-limiting drawings, in which:

is a sectional view schematically representing an example of a corrugated cardboard element according to a first embodiment of the invention.

is a sectional view schematically representing an example of a corrugated cardboard element according to a second embodiment of the invention.

is a sectional view schematically representing an example of a corrugated cardboard element according to a third embodiment of the invention.

is a sectional view schematically representing an example of a corrugated cardboard element according to a fourth embodiment of the invention.

is a top view representing very schematically a package filled with articles protected by means of a corrugated cardboard element according to the first embodiment of the invention.

is a top view representing very schematically a package filled with bottles protected by means of a corrugated cardboard element according to the third embodiment of the invention.

is a top view representing very schematically a package filled with articles protected by means of a corrugated cardboard element according to the fourth embodiment of the invention.

schematically illustrates an example of a manufacturing method according to one embodiment of the invention.

schematically illustrates an example of a manufacturing method according to one embodiment of the invention.

is a perspective view of an example of corrugated cardboard according to the second embodiment to illustrate an advantageous variant of the method according to the embodiment of the invention.

Identical references can be used from one figure to another to designate identical or similar elements.

Referring to Figure 1, a corrugated cardboard element 1 comprises a superposition of sheets 11, 21, 22, namely:
- a flat sheet of paper, called flat sheet 11,
- a first sheet of corrugated paper 21 glued to the flat sheet 11, by means of glue 30,
- a second fluted sheet of paper 22 whose flutes are embedded in the flutes of the first fluted sheet 21.

Sheet 22 is not glued to sheet 21 or to sheet 11, and can therefore be detached from the rest of element 1.

FIG. 5 shows an example of the use of this element 1 as an article protection element 31, 32, 33 packaged in a packaging 34 of which the cover has not been shown, for example a postal parcel.

Element 1 is separated over approximately half of its length into two son elements 2, 3. Son element 3 comprises sheets 11, 21 glued together and son element 2 simply comprises fluted sheet 22.

On a portion 35, the sheets 21, 22 have kept their grooves embedded, thus forming a superposition of three relatively flexible sheets, and which can for example surround the article 32.

Each of the child elements 2, 3 can surround a corresponding article 31, 33, over at least part of its periphery.

The element 1 can thus make it possible to protect the articles 31, 32, 33 with less length of material than in the prior art.

In the embodiment of Figure 2, the element 1 'comprises, in addition to the sheets 11, 21, 22, a second flat sheet 12 glued to the corrugated sheet 22.

The element 1' is therefore rigid and can be stored in the form of a plate.

Element 1' can be separated into two child elements, not shown, each comprising a flat sheet and a corresponding corrugated sheet.

Storing the element 1′ flat can be more advantageous in terms of compactness than storing these two wire elements in the form of a roll(s).

In the embodiment of Figure 3, the element 1'' comprises, in addition to the sheets 11, 21, 22, 12:
- A third corrugated sheet 23 glued to the flat sheet 12;
- a fourth fluted sheet 24 whose flutes are embedded in those of the third fluted sheet 23, without gluing, and
- a third flat sheet 13 glued to the fluted sheet 24.

The element 1″ can be separated, over part of its length or over its entire length, into three son elements each comprising only two or three thicknesses of cardboard.

FIG. 6 illustrates an example of the use of this element 1'', as a brace for wedging bottles.

In this figure, only the side walls and the bottom of a packaging 60 made of corrugated cardboard, for example an American box, have been shown.

Six glass bottles 61-66 are placed upright on the bottom of the package 60, in two rows of three bottles each.

Between these rows, a section of element 1" with seven thicknesses is installed, this piece having a length close to that of the packaging 60.

At the longitudinal ends of section 1'', two two-ply 2'', 3'' wire elements have been detached from a three-ply 4" wire element.

The son element 2'' comprises the thicknesses 11, 21 and is inserted, at one end, between the bottles 61 and 62, and at the other end, between the bottles 62 and 63.

The son element 3'' comprises the thicknesses 13, 24 and is inserted, at one end, between the bottles 66 and 65, and at the other end, between the bottles 65 and 64.

The element 1″ can thus be advantageous relative to the braces of the prior art due to its compactness during storage and its lightness.

One could of course provide variants, in which the corrugated cardboard element would comprise even more thicknesses.

For example, in the embodiment of Figure 4, element 1''' comprises, in addition to sheets 11, 21, 22, 12, 23, 24, 13:
- a fifth fluted sheet 25 glued to the flat sheet 13,
- a sixth fluted sheet 26 whose flutes are embedded in those of the fifth fluted sheet 25, without gluing, and
- a fourth flat sheet 14 glued to the fluted sheet 26.

This element 1''' can be separated into four child elements, and FIG. 7 illustrates an example of the use of this element 1''' as a star wedging.

As in the example of use of FIG. 6, the splines are undone on end portions only, a central part retaining all of the thicknesses.

Element 1''' thus makes it possible to protect eight articles 71-78 packaged in a packaging 70 from shocks.

Figures 8 and 9 relate to the manufacture of a corrugated cardboard element according to the second embodiment, with four layers. Figure 8 shows the installations for obtaining a corrugated cardboard element according to the first embodiment, with three thicknesses and Figure 9 shows an installation for gluing the second flat sheet 12.

Referring to Figure 8, there is provided a roll 81 of flat paper 11, said cover paper, and a roll 82 corresponding to the corrugated paper.

This roller 82 is special in the sense that two sheets 21, 21 of superposed flat paper have been wound therein.

On the other hand, the rest of the installations are in accordance with the prior art.

The sheets 21, 22 pass around a pre-conditioning cylinder 83, through a humidifier 84, then between two corrugated cylinders 85, 86, and finally between the corrugated cylinder 86 and a coating cylinder 87 soaking in a tray of sizing 88.

In a manner known per se, the sheet 11 coming from the roll 81 passes around a preheating cylinder 89 and a smooth press 90.

These pieces of equipment 83-90 are of the type known from the prior art and may in particular already be in place on an existing installation.

It may be noted that the two sheets 21, 22 are moistened and deformed so as to form grooves, but that, on the other hand, only the sheet 21 is coated with glue at the upper ends of its grooves.

The three sheets 11, 21, 22 pass between the smooth press 90 and the corrugated cylinder 86 and the forces exerted by the smooth press 90 lead to the remaining flat sheet 11 sticking to the corrugated sheet 21.

A corrugated cardboard element 1 according to the first embodiment of the invention is thus obtained.

Provision may be made to bring this element 1 to the installation of figure 9 in order to add a second flat sheet 12 to it.

A roller 91 makes it possible to store the sheet 12. It then passes through a preheater 92, a cylinder 93 of the type known from the prior art.

The element 1 is brought against an additional coating cylinder 94, dipping in a glue tank 95, to coat the ends of the grooves of the sheet 22 with glue.

In a traditional corrugator, this additional coating cylinder 94 is used to coat the still free face of the corrugated sheet already glued to the first flat sheet with glue.

Then the element 1 and the sheet 12 are brought together and an additional smooth press of the type known from the prior art causes the adhesion of the sheet 22 to the sheet 12, thus making it possible to obtain a rigid sheet of corrugated cardboard with four thicknesses 1' according to the second embodiment of the invention.

Figure 10 is a perspective view of an example of corrugated cardboard according to the second embodiment to illustrate an advantageous variant of the method according to the embodiment of the invention.

In this figure, the sheets 11, 12 are shown as yet unglued to the sheets 21, 22 in order to illustrate the manufacturing process, but in reality a greater length of corrugated cardboard could be provided between the two gluing stations.

In this variant, the sheet 21 is narrower than the sheet 22, and is positioned centrally so that each of these side edges is below the corresponding side edge of the sheet 22, for example by about ten centimeters, according to which will be the longitudinal direction of the splines.

The side edges of the sheet 21, of which only one 210 is referenced, are each below the corresponding side edge of the second sheet 22, in particular the edge referenced 220.

The installation is shaped so that each of the side edges 220 of the sheet 22 is aligned with a corresponding side edge 110 of the sheet 11. The sheets 11 and 22 have the same width.

On each side, a lateral edge portion, of which only one 222 is referenced, of the sheet 22 is coated with glue by the coating cylinder reference 87 and joined by gluing to an edge of the sheet 11. These joinings between the sheet 22 and the sheet 11 can make it possible to avoid slippage between the sheets 21, 22, and therefore better hold these three sheets 11, 21, 22 on the corrugator.

Sheet 22 can then be joined by gluing to sheet 12, with an installation as shown in FIG. 9 for example.

As illustrated in FIG. 10, these joining edges, 15, 16, of the first flat sheet 11 to the second corrugated sheet 22 are then eliminated ("trim"), for example by cutting.

Claims (8)

Corrugated cardboard element comprising:
a flat sheet of paper, called a flat sheet (11),
a first sheet of corrugated paper (21) glued to the flat sheet,
a second sheet of fluted paper (22) whose flutes are embedded in the flutes of the first sheet of fluted paper. Corrugated cardboard element according to claim 1, further comprising an additional flat sheet of paper (12), called the second flat sheet, glued to the second sheet of corrugated paper (22). A corrugated cardboard element according to claim 2, further comprising
a third sheet of fluted paper (23) glued to the face of the second flat sheet (12) opposite the face of this second flat sheet glued to the second sheet of fluted paper (22),
a fourth sheet of fluted paper (24) the flutes of which are fitted into the flutes of the third sheet of fluted paper, and
an additional flat sheet (13), called the third flat sheet, glued to the fourth sheet of corrugated paper (24). A method of manufacturing a corrugated cardboard element, comprising
- superimpose two flat sheets of paper (21, 22) and feed a passage between two fluted cylinders (85, 86) with said superimposed flat sheets, so as to obtain a first and a second fluted sheets whose flutes are embedded between them, And
- Glue an additional flat sheet of paper (11) to the first fluted sheet. A method according to claim 4, further comprising a step of gluing a second flat sheet of paper (12) to the second corrugated sheet (2). Process according to Claim 4 or 5, in which, upstream of the corrugated rolls (85; 86), the two sheets (21, 22) intended to define the corrugations are wound superimposed, in the same roll (82). A method according to any of claims 4 to 6, wherein at least one side edge of the first corrugated sheet (21) is below the corresponding at least one side edge of the first flat sheet (11) and the at least a corresponding lateral edge of the second corrugated sheet (22), such that the gluing step leads to gluing at least one lateral end edge of the first flat sheet (11) to at least one corresponding lateral end edge the second fluted sheet (22),
the method further comprises a step of removing at least one edge for joining the first flat sheet to the second corrugated sheet. Use of the corrugated cardboard element according to any one of Claims 1 to 3 as a separating element and/or wedging of articles packaged in a packaging.