LT3490B - A pallet - Google Patents

Abstract

The invention relates to a pallet (1) manufactured of recyclable cardboard. The pallet (1) consists of beams (3) attached crosswise in two layers above which a covering sheet (2) of cardboard can be provided. According to the invention the beams (3) are formed of parallel, tube-like board core pieces (4) which are surrounded by a sheet of corrugated cardboard (6). The axes of the core pieces (4) are perpendicular to the level of the pallet (1). Glue which is separated in the manufacturing process of recycled pulp is used for assembling the beams (3) and attaching the beams and the covering sheet (2) to each other to form the pallet (1). The material of the pallet is recycled into said manufacturing process or recycled pulp after use.

Description

The present invention relates to a pallet made largely of recyclable cardboard using tubular pieces of thick cardboard core which are arranged in a pallet such that their axes are perpendicular to the horizontal surface of the pallet. Cardboard is used to make it possible to recycle the material.

Pallets are usually made of wood, which gives them high carrying capacity. A wooden pallet can be reused several times, but in practice the pallets become waste very quickly.

It is also well known to make pallets from cardboard which can be recycled into pulp after use. This solves the waste problem. Nevertheless, many cardboard pallets are abandoned because they do not have the same strength and carrying capacity as wooden pallets.

Patent SE 356994 discloses a pallet made of tubular, thick cardboard core pieces. They are positioned next to each other throughout the pallet area. The pallet has supports so the pipe pieces come in different sizes. The core pieces, whose axes are perpendicular to the horizontal surface of the pallet, give the pallet a high lifting capacity, but the disadvantage is that the production of the pallet is tedious.

The object of the present invention is to form a pallet of thick cardboard tubular core pieces which has a high load-bearing capacity and is more robust and easy to manufacture than previously known cardboard pallets. The pallet according to the present invention is distinguished by having beams formed of parallel tubular thick cardboard cores and wrapping them in cardboard, fixed to each other crosswise in two overlapping layers.

According to the invention, the pallet is made entirely from recyclable material and this alone provides benefits regardless of other properties.

According to the invention, the cardboard cores used in the pallet are generally made of paper rolls. The cores are made of cardboard, which is twisted into a tube and its layers are glued together. Produces a thick walled tube with a wall made of many cardboard layers. For the production of cardboard cores, generally recycled pulp is used. This type of core, made from recycled material, has high axial compression strength, which provides the pallet with the necessary lifting capacity. The cores according to the invention are thus made from recycled materials, cut into small pieces, arranged in a single row and wrapped in cardboard. This produces long beams that can be used to make a pallet in the same way as ordinary wooden pallets. The production of beams from uniformly sized core pieces is easy to automate.

According to the invention, the height of the core pieces used in said beams is approximately equal to or slightly less than their outer diameter. This dimensioning gives the pallets sufficient lifting capacity and easy assembly.

In the present invention, the cardboard surrounding the cardboard core pieces is corrugated, comprising alternately corrugated and smooth layers. The beams are fixed in a longitudinal direction to stiffen the beams.

If the product retains its shape when loaded onto a pallet, such as hard boxes or similar packages, the size of the pallet being equal, the pallet may consist only of beams which are cross-linked.

However, the pallet of the present invention typically has a sheet of coating which is attached to the top of the beams and is made of rigid cardboard, so that the pallet can be used for loading smaller dimensions or for packing unpacked articles such as bags.

To facilitate transport of the pallet, the beams are positioned parallel to one another in at least one layer of the pallet so that the pallet can be raised by inserting the forks into the opening of the pallet.

The substrate of the invention can be assembled using only glue that is released from the pulp material during recycling. These binders consist of, for example, so-called hot melt adhesives and cold adhesives. In addition, rivets can be used to secure the pallet.

The pallet of the invention may be attached to a lifting package. The pallet and the package, such as a large paper bag, thus form an overall package which can be recycled after use.

The invention will now be described by way of example and by means of the accompanying drawings, in which:

FIG. 1 shows a pallet consisting of crossed beams and a cover sheet.

FIG. 2 shows one section of the pallet beam from above with a partial section,

FIG. 3 is a side elevational view of the same beam, FIG. 4 depicts an unfinished beam in which the pieces of cardboard core are arranged in a row on the corrugated cardboard on which they will be wrapped,

FIG. 5 depicts one piece of core from the beam,

FIG. 6 depicts a piece of one made beam,

FIG. 7 shows an enlarged angle of a piece of corrugated cardboard for use in beams, and

FIG. 8 shows the filling of a large paper bag glued to a pallet.

FIG. 1 shows a pallet according to the invention which is ready for use and made entirely of reusable materials. The pallet 1 consists of a coating sheet 2 made of rigid corrugated cardboard and beams 3 made of cardboard and arranged crosswise in two layers. The coating sheet 2 and the beams 3 are bonded with hot glue released during the pulp recycling process. The size of the pallet 1 is usually 0.5 - 1.5m x 0.5 x 1.5m and is designed for transportation such as large paper bags weighing several hundred kilograms. The pallet 1 is arranged in parallel with the beams 3 in relation to each other so that the pallet can be transported by inserting the forks of the truck between the beams.

The construction of the beams 3 in the tray 1 is shown in Figs. 2. 7. Tubular cardboard core pieces 4 shown in Figs. 5, which are cut from cardboard cores used, for example, as paper roll cores. The inner diameter of the core pieces 4 generally varies from 85 to 180 mm, the wall thickness from 2 to 15 mm and the height h from 30 to 100 mm.

The optimum height h of the core piece 4 is slightly less than or equal to the outer diameter D.

The core pieces 4 may be arranged in a beam 3 in a row, as shown in Figs. 4. The number of core pieces 4 in the beam may vary depending on the length of the beam, i.e., the dimensions of the pallet 1. If the desired beam length is not a multiple of the outer diameter D of the core piece, a gap may be left in the middle of row 4 of the core pieces. Typically, the core pieces are glued in a row laterally to each other.

The core pieces 4 in the beam 3 are wrapped in corrugated cardboard sheet 6 having folds 5 corresponding to the rib edges. The strips of sheet 6 on the outside of the pallet are made in such a manner that they overlap the top of the core pieces 4 and are glued together with said dissolved adhesive. The same adhesive is used on all contacting surfaces of core pieces 4 and corrugated board 6.

The corrugated cardboard sheet 6 is dimensioned such that its outer strips are only half the width of the beam 3. In this way, the beam 3 has a corrugated cardboard layer in which the edges of the sheet 6 are disposed opposite and do not overlap each other, as can be seen from FIG. 6. The corrugated cardboard 6 used in the beams 3 is composed of 5 overlapping layers as shown in Figs. 7, one of which in the middle and the outer ones are straight 7 and the other two are corrugated 8. The corrugation lines of the layer 8 follow the axis of the beam 3.

With respect to the carrying capacity of the pallet 1, it is important that the axes 9 (compare Fig. 4) of the tubular core pieces 4 are oriented in the loading direction, i.e. perpendicular to the horizontal surface of the pallet (covering sheet 2).

FIG. 8 shows a tray 1 according to FIG. 1 which holds a large paper bag 10 filled with bulk or granular products. The bag 10 is filled when placed on a pallet and can be glued to it. The Pa5 tray 1 and the bag together form a single packing element and, once emptied, can be used as a raw material for making pulp.

Those skilled in the art will appreciate that the invention is not limited to the examples described above, but may be modified within the scope of the appended claims.

Claims (9)

DEFINITION OF INVENTION 1. The pallet (1) is substantially made of recyclable cardboard, using tubular thick cardboard core pieces (4) disposed on the pallet such that their axes (9) are perpendicular to the horizontal surface of the pallet, the pallet (1) having beams (3) consisting of parallel pieces of said tubular thick cardboard (4) wrapped in corrugated cardboard (6), the beams being fixed to one another crosswise in two overlapping layers of a pallet. A pallet according to claim 1, characterized in that the height (h) of the core tip (4) is equal to or less than its outer diameter (D). 3. A pallet according to claim 1 or 2, characterized in that the beams (3) are made of corrugated cardboard (6) in the direction of the beams. 4. A pallet according to claim 3, characterized in that the corrugated cardboard (6) is made of alternately corrugated (8) and smooth (7) layers. Pallet according to any one of claims 1 to 4, characterized in that, in addition to the layers formed by the beams, the pallet (1) has a coating sheet (2) of rigid cardboard. 6. A pallet according to any one of claims 1 to 5, characterized in that, at least in one of the layers, the beams (3) are spaced from each other such that the pallet (1) can be lifted by fork tines inserted into the slots between the beams. . 7. A pallet according to any one of claims 1 to 6, characterized in that the parts of the pallet (1) are attached to one another by means of an adhesive obtained during material recycling. A pallet according to any one of claims 1 to 7, characterized in that the pallet (1) is attached to a large paper bag (10). 9. A pallet according to claim 8, characterized in that a large paper bag (10) is glued to the pallet (1).