LT6353B - The cardboard pallet and method of manufacture - Google Patents

Abstract

Sphere of the usage of invention- transportation of cargo including storage of loaded pillow-block on the shelveless racks, robotic packaging, transportation system. Pillars of the cardboard pillow-blocks are glued out of corrugated cardboard panels in which scotches of layers of glued cardboard pillows are perpendicular to the panel of the pillow-block shaping three pillar blocks lengthwise to the longest side of the pillow-block and formed from each of the support blocks. Lengthwise supports of the pillow-block are connected using mechanically glued links with crossbars which are constructed out of corrugated cardboard panels in which scotches of corrugated cardboard panels are perpendicular to pillow-block so that the frame of the cardboard pillow-block would be formed, the last cardboard panel is glued on that frame. Rectangular sockets having stepped lower part are installed on the upper sides of the supports. After having put and glued crossbars connected with supports, connection of mechanically glued pillars and supports is formed on the upper side. The main advantages of the cardboard pillow-block are: it is suitable for all modern logistic operations of transportation, capacity of loading is adequate to the capacity of loading of certified wooden pillow-block, weight is twice lower than the weight of the wooden pillow-block.

Description

Field of application of the invention is cargo transportation. The offered pallet can be used for modern pallet logistics operations, including stacked pallet racking, robotic bundling, palletized transport in a rolgang system, loading and shipping of various loads.

There are various cardboard pallets for cargo transportation. Among the known analogues, the closest one is the pallet described in U.S. Pat. June 1 (Application No. US 12 / 127.062, Publication No. US 20080295747 / A1). The cardboard pallet described in this patent has the following disadvantages.

Low top transverse stiffness of cardboard board. On the perimeter of this pallet, the panel rests on four positions along the long edge and three on the short edge. When pallets of bulk products such as sugar, flour, milk flour, etc. are palletised, the top plate curves where it does not rest on the supports. With bags curved around the perimeter, bags placed on a pallet tend to slide away from the pallet. The curvature of the perimeter of the top panel is increased by loading small bags of products such as sugar, salt, and so on. The tendency for the perimeter curvature of the plate to remain is also maintained when loading pallets with a small bottom area. The circumferential curvature of the top plate is particularly enhanced when the robotic, force damper palletizing of bulk bags is carried out. This is the most used palletizing method. It consists of stacking single-row bags of bulk products over a pallet on a double-sided damper. After applying a layer of bags through the damper to the pallet, it is ironed vigorously by pressing the tray with bags against the underside of the valve. The process is performed after each bag damper is placed. The analog design is suitable when the products are placed in a box with the bottom as the top plate of a pallet.

The loaded pallet is not suitable for rolgang transportation, which is widely used in palletizing and transport to warehouse operations. This disadvantage lies in the configuration of the underside of the pallet support. The underside of the support has two edges, one in the direction of the pallet movement and the other transverse to the direction of movement of the pallet. Due to the loaded pallet moving on the rolgang conveyor, significant transverse deformation of the transverse support ribs between the rolgang conveyor shafts results.

The low shear strength of the substrate, i.e. low slab adhesion with pallet support surfaces. This is due to the fact that the lower part of the panel is glued only to the spongy surfaces of the upper parts of the supports: a layer of glue is formed on the edges of the spongy surface of the supports. Porosity is a feature of multilayer corrugated board. Slip resistance is a measure of the strength of bonding of the board to the upper surfaces of the supports and has a very significant influence on the strength of the substrate as a monolithic mechanical structure.

The object of the invention is to provide a pallet that is lighter, more robust and suitable for use in modern transport logistics.

Invention Static State

The cardboard pallet supports are glued from flat corrugated cardboard panels, wherein the lines for bonding the corrugations to the flat cardboard layers are perpendicular to the pallet plate, forming three longitudinal blocks of pallet having three supports formed from each block of supports.

The edge rails are positioned closer to the short edge of the pallet, forming stiff edges on both edges of the pallet, which gives the pallet greater transverse stiffness across the perimeter.

The upper pallet plate is based on the entire circumference of the extreme longitudinal supports and transverse upper surfaces.

The middle parts of the longitudinal supports are significantly longer than the edges, which ensures the pallet is suitable for storage in rack-mounted racks.

The pallet supports are joined by mechanical-glued joints with transverse glued sheets of corrugated cardboard, in which the lines of bonding the corrugations to the flat cardboard layers are perpendicular to the pallet board, forming a cardboard pallet frame to which the upper cardboard is glued.

In turn, the rectangular sockets in the upper parts of the support blocks have a stepped lower part, on which, when the rails are inserted into the recesses at the joining points, a mechanical-glued joint of the transverse and longitudinal supports is provided with the adhesive.

The pallet frame structure consists of longitudinal supports and rails.

The longitudinal supports of the pallet are joined to the transverse ones by mechanical glued joints. Mechanical joints are threshold and all surfaces of joints are lubricated with glue.

The transverse layout density is optimally selected: up to five transverse rails form the back of the pallet, while the inner transverse rails ensure pallet loading and structural strength.

Both the number of rails and their dimensions are calculated in such a way that the pallet is lighter without sacrificing the strength of the structure, but at the same time ensures optimum structural strength and at the same time load capacity (rails height up to 80 mm).

The same can be said for longitudinal supports: the empty spaces in the supports are also calculated with respect to the optimum weight of the longitudinal supports. The height of the longitudinal supports is up to 156 mm, the free spaces of the longitudinal supports are 180-220 mm and the height is up to 90 mm.

The supports and rails are composed of glued flat corrugated cardboard panels, in which the lines for bonding the corrugations with the layers of flat cardboard are perpendicular to the pallet board.

The load capacity and weight of a cardboard pallet depend on the number of layers of cardboard in the longitudinal supports and transverse sections: this number may be from 2 to

4.

In order to increase the mechanical strength and load capacity of the cardboard pallet, the top plate is perforated at the point of gluing with the top of the pallet frame. This allows the bonding of the panel and the frame with both glue and the resulting polymer pins. The perforation holes for plate bonding with longitudinal supports and transverse locations shall be 2 to 4 mm and 1 to 3 mm in diameter.

To use a cardboard pallet in a low humidity environment, the pallet is coated with a thin layer of moisture-resistant adhesive. The adhesive layer has a thickness of 20 to 60 micrometers.

In order to increase the mechanical strength and load capacity of the cardboard pallet, the top cardboard is formed from several glued layers of cardboard (2 to 4), and when extra strength is required, these layers can be increased to 6 panels at 200 kg, up to 8 up to 10 plates up to 1000 kg and up to 20 plates up to 2000 kg.

Description of Embodiment of the Invention

The cardboard sheets cut out the support and transverse elements, which are glued to the longitudinal supports and transverse elements. The adhesive is coated with a high pressure (200 bar) spray, which allows a thin (20-30 micrometer) layer of adhesive to be formed. The adhesive is sprayed on heated cardboard supports and cross members up to 100 ° C. This ensures maturation of the supports and transverse adhesive layers.

The collection of the cardboard pallet itself is carried out in a ring conveyor using the collection conductors. In the first position, three supports are assembled into the picking conductor, in the second position the struts are joined with transverse glue, in the third position the transverse surfaces are glued, in the fourth position by the perforated top plate, in the sixth the assembled pallet is moved identification (character writing) post. The identified cardboard tray is impregnated with a thin layer of moisture-resistant adhesive. The identified impregnated pallet is transported to the pallet.

The cardboard pallet offered has the following advantages:

It has the same load capacity as certified wooden pallets.

It is suitable for all modern logistics operations such as palletized pallet racking, robotic packing and rolgang transport.

It does not cause biological contamination during operation.

The weight is twice that of a wooden pallet.

It is made of waste paperboard.

Used pallet suitable for waste paper recycling.

Drawings

Fig. 1 is an isometric view of a cardboard pallet

Fig. 2 - Isometric view of cardboard pallet frame without top for better view of pallet construction

Fig. 3 is an isometric view of a longitudinal support of a cardboard frame

Fig. 4 is an isometric view of a cardboard tray cross section

Fig. 5 is a bottom isometric view of a cardboard pallet frame. Added to view the entire pallet construction from below.

Fig. 6. Isometric view of cardboard pallet joint support with transverse fragment.

Explanations of the reference drawings

- Diagram of cardboard pallet

- Cardboard tray crossbar

- Cardboard tray top plate

- Rectangular socket for cardboard pallet with stepped part

- Edge rectangular socket with stepped part in cardboard tray cross.

- Middle rectangular slot on cardboard tray cross section.

Claims (12)

1. A cardboard pallet having an upper cardboard plate and cardboard supports, wherein the cardboard pallet support is glued from a sheet of corrugated cardboard wherein the lines of bonding the waffles to the flat cardboard layers are perpendicular to the pallet edge, having three supports formed from each support block. 2. The carton according to claim 1, wherein the transverse rails are arranged closer to the short edge of the pallet by forming rigid ridges on both edges of the pallet. 3. A carton pallet according to claim 1, wherein the top pallet is based on the entire circumference of the longitudinal supports and transverse upper surfaces. 4. The carton according to claim 1, wherein the central portions of the longitudinal supports are significantly longer than the peripheral ones. 5. The carton according to claims 1-4, characterized in that the pallet supports are joined by mechanical-glued joints with transverse corrugated sheets of corrugated cardboard, in which the lines of gluing the corrugations with the flat cardboard layers are perpendicular to the pallet frame, the upper part of which is glued to the upper cardboard. 6. A cardboard pallet according to claims 1-5, wherein the top cardboard is perforated with an upper surface of a glued-on pallet frame consisting of cardboard cross-sections connected to cardboard cross-sections, wherein the gluing sites have perforations with a depth of 2-4. mm and a diameter of 17 3 mm. 7. The carton according to claims 1-6, characterized in that the rectangular sockets in the upper parts of the support blocks have a stepped lower part, on which, upon application of the transverse joints to the props, a mechanical-glued joint of the transverse and props is formed with glue. 8. The carton according to claims 1-7, wherein two transverse trays are arranged at the edges of the pallet at the short edge, one at the center of the center supports and the other at the edge supports. 9. The carton according to claims 1-8, wherein the carton is coated with a 20-60 micrometer layer of moisture-resistant adhesive. 10. The carton according to claims 1-9, characterized in that, in order to increase its mechanical strength and load capacity, the top cardboard is formed from 2 to 20 glued layers of cardboard depending on the load capacity required. 11. The carton according to claim 5, 6, 9, characterized in that the surfaces of the adhesive coated elements are preheated to 100 ° C. 12. The carton according to claim 11, characterized in that it is impregnated on a heated surface of up to 100 ° C by spraying with water resistant adhesive under high pressure (up to 200 bar).