Cardboard packaging

Abstract

Cardboard packaging, having a polygonal bottom (1) and a series of walls (2,3), characterized in that it comprises a female wall (2) between each two male walls (3), and a male wall (3) between each two female walls (2), and in that: the female walls (2) are constituted by a roll of square or rectangular section formed by the folding of a flap formed by a first straight section (21), a converging section (22), which reduces the width of the flap, and a second straight section (23) of the same width as the end of the converging section (22), such that between each pair of sections (21, 22, 23) there is a fold line (4) and where the second straight section (23) has at least one inner fold line (4); The male walls (3) are made up of a roll of square or rectangular section formed by folding an extension consisting of a first straight fragment (31), a converging fragment (32), which reduces the width of the extension, and a second straight fragment (33), of the same width as the first straight fragment (31), such that between each pair of fragments (31, 32, 33) there is a fold line (4) and where the second straight fragment (33) has at least one inner fold line (4); where the converging section (22) has inclined converging flap edges (221), of equal length to converging extension edges (321) on the converging fragment (32); and the first straight section (21) has a first length (a) equal to or greater than a second length (b) of the first straight fragment (31); and the fold lines (4) of each flap or of each extension are parallel to each other.

Description

Cardboard packaging TECHNICAL SECTOR The present invention relates to a cardboard packaging, forming an easily recyclable tray, capable of replacing trays and frames made of polystyrene or other types of plastic. It may include a cardboard lid, which is not an essential part of the invention. STATE OF THE ART The existence of polystyrene trays or trays made of other types of plastic is known in the prior art. These trays can be recycled to a greater or lesser extent, but their recyclability is limited at best. The plastic recycled in this way is only usable as filler, as it loses some of its properties. However, cellulosic materials, such as cardboard, are easily recyclable and can be used an unlimited number of times without significant loss of properties. However, there is no known way to achieve a cardboard tray with the resistance properties of known plastic trays, and manufactured with a single material such as cardboard. The applicant is unaware of any solution that would solve all these problems as effectively as the invention. BRIEF EXPLANATION OF THE INVENTION The invention consists of a cardboard packaging according to the independent claims and whose variants solve the problems of the state of the art. Specifically, cardboard packaging has a polygonal base, usually square or rectangular, and a series of walls divided into male and female walls. It comprises one female wall between each pair of male walls, and one male wall between each pair of female walls. The female walls consist of a roll formed by folding a flap made up of a first straight section, a converging section that reduces the width or dimension in the longer direction of the flap, and a second straight section of the same width as the end of the converging section. Between each pair of sections there is a fold line, and the second straight section has at least one inner fold line. The male walls consist of a roll formed by folding an extension comprised of a first straight fragment, a converging fragment that reduces the width of the extension, and a second straight fragment of the same width as the first straight fragment. Between each pair of fragments there is a fold line, and the second straight fragment has at least one inner fold line. The converging section has inclined overlapping convergent edges, which produce the indicated convergence, and whose length is equal to equivalent extension convergent edges in the converging fragment. Furthermore, the first length, or dimension between fold lines that define the first straight section, is equal to or greater than a second length of the first straight fragment. As an expert will understand, the fold lines of each flap or extension are parallel to each other in order to form the roll. These rolls provide excellent protection against side impacts, safeguarding the items inside the packaging. Furthermore, because they are produced from sheets, they take up minimal space until folded and ready for use. Moreover, their manufacture from cardboard sheets is considerably simpler than injection molding or plastic molding, saving both time and money. Preferably, the second straight section has three inner fold lines. Ideally, the second straight fragment has three interior fold lines. Other variations can be seen in the rest of the memory. DESCRIPTION OF THE FIGURES For a better understanding of the invention, the following figures are included, showing exemplary embodiments. Figure 1: Perspective of an example of the implementation of the invention. Figure 2: Section of an example of a female wall. Figure 3: Plate from the example in Figure 1. Figure 4: Perspective example of a partially assembled package. MODES OF REALIZING THE INVENTION Next, a brief description is given of one way of carrying out the invention, as an illustrative and non-limiting example thereof. Figure 1 shows an embodiment consisting of a tray with a bottom (1) and four sides (2, 3) made of square or rectangular cardboard rolls (Figure 2). These square or rectangular rolls provide the necessary rigidity to the packaging. Figure 3 shows the cardboard sheet used to form the tray. It also shows that the walls (2, 3) are of two types: two female walls (2) and two male walls (3), the latter partially inserted within the female wall (2). The packaging is polygonal, generally rectangular or square, and the walls (2, 3) alternate, so that each male wall (3) is between two female walls (2), and vice versa. Each wall (2, 3) has the same width as the edge of the bottom (1) where it is placed, thus covering the entire edge. The female wall (2) consists of a flap with a first straight section (21), a converging section (22) that reduces the flap's width, and a second straight section (23) with the same width as the end of the converging section (22). A fold line (4) is located between each section (21, 22, 23), and the distance between the fold lines (4) that define the section is called its "length." The second straight section (23) has at least one internal fold line (4), which in Figure 2 corresponds to three fold lines (4) that divide the second straight section (23) into four parts. Generally, the second straight section (23) will have between one and three fold lines. The converging section (22) has inclined converging flap edges (221). In contrast, each male wall (3) consists of an extension with a first straight segment (31), a converging segment (32), which also reduces the width of the extension, and a second straight segment (33), the same width as the first straight segment (31). A fold line (4) is located between each segment (31, 32, 33), and the distance between the fold lines (4) that define the segment is called its "length." The second straight segment (33) also has at least one fold line (4), which in Figure 3 corresponds to three fold lines dividing the second straight segment (33) into four parts. If more than three fold lines are desired, a second converging segment (not shown) must be added to align with the converging segment (32). The second straight fragment (33), once coiled, protrudes from the converging fragment (32) to be inserted into the female wall (2). To achieve this, a first length (a) of the first straight section (21) is equal to, or slightly greater than, a second length (b) of the first straight fragment (31). In this way, the second straight fragment (33) can be inserted below the converging section (22). The converging fragment (32) has converging extension edges (321) that must be of the same length as the converging overlap edges (221) to avoid discontinuities in the wall. The angle of the converging section (22) and the angle of the converging fragment (32) add up to 90° in rectangular or square trays. That is, if the lateral angle of the converging section (22) is 60°, the lateral angle of the converging fragment (32) will be 30°. In the preferred embodiment, Figure 1, both angles are 45°, so the length of the converging edges (221, 321) is identical. To assemble the packaging, all the fold lines (4) of the male wall (3) are folded inwards, forming a roll with a square or rectangular cross-section. Then all the fold lines (4) of the female wall (2) are folded inwards, so that it hooks on the side into two tubes that protrude from the male wall (2), stiffening the assembly (Figure 4). To retain the walls (2, 3) it is recommended to fix, for example, with adhesive such as glue or molten silicone, at least the second straight section (23) of each female wall (2) and, preferably, also the second straight fragment (33). The preferred material is corrugated cardboard, to achieve the most suitable strength.

Claims

1. Cardboard packaging, having a polygonal bottom (1) and a series of walls (2,3), characterized in that it comprises a female wall (2) between each two male walls (3), and a male wall (3) between each two female walls (2), and in that: the female walls (2) are constituted by a roll of square or rectangular section formed by the folding of a flap formed by a first straight section (21), a converging section (22), which reduces the width of the flap, and a second straight section (23) of the same width as the end of the converging section (22), such that between each pair of sections (21, 22, 23) there is a fold line (4) and where the second straight section (23) has at least one inner fold line (4);The male walls (3) are constituted by a roll of square or rectangular section formed by the folding of an extension formed by a first straight fragment (31), a converging fragment (32), which reduces the width of the extension, and a second straight fragment (33), of the same width as the first straight fragment (31), such that between each pair of fragments (31, 32, 33) there is a fold line (4) and where the second straight fragment (33) has at least one inner fold line (4); where the converging section (22) has inclined converging flap edges (221), of equal length to converging extension edges (321) in the converging fragment (32); and the first straight section (21) has a first length (a) equal to or greater than a second length (b) of the first straight fragment (31);and the fold lines (4) of each flap or extension are parallel to each other.

2. Cardboard packaging according to claim 1, characterized in that the second straight section (23) has three inner fold lines (4).

3. Cardboard packaging according to claim 1, characterized in that the second straight section (33) has three inner fold lines (4).

4. Cardboard packaging according to claim 1, characterized in that it is made of corrugated cardboard.