Pallet stacking board construction
A pallet stacking board comprising a laminate structure is provided in which a non-woven polypropylene geotextile fabric material is used to create a suitably shaped bag in which a rigid or semi-rigid polyurethane material is injected, and allowed to react and cure. The upper and lower exterior surfaces of the pallet stacking board are coated with a non-slip material which is preferably provided by a polyurethane coating material so as to provide a textured finish. The pallet stacking boards provide desirable non-slip properties while being readily manufactured using automated procedures.
1. A pallet stacking board for use in separating upper and lower stacked pallets, said pallet stacking board comprising:
a board structure having opposing, generally flat upper and lower flexible fabric cover material layers defining respective continuously planar upper and lower surfaces of the board structure, and
a semi-rigid core layer comprising a foamed material, between said upper and lower fabric cover material layers, wherein said foamed material is mechanically bonded to said upper and lower fabric cover material, and wherein said upper and lower fabric cover material layers have a non-slip surface,
wherein said pallet stacking board is constructed and arranged to distribute weight from the upper pallet evenly over the lower pallet when said pallet stacking board is engaged between the upper and lower pallets via the respective continuously planar upper and lower surfaces.
2. A pallet stacking board as claimed in claim 1 wherein said semi-rigid core layer is expanded polystyrene, or a polyurethane material.
3. A pallet stacking board as claimed in claim 1 wherein said semi-rigid core layer is a semi-rigid polyurethane foam material.
4. A pallet stacking board as claimed in claim 3 wherein said polyurethane foam material has a density of between 3 and 5 lbs per cubic foot (pcf).
5. A pallet stacking board as claimed in claim 1 wherein said upper and lower fabric cover material layers are geotextile fabric.
6. A pallet stacking board as claimed in claim 5 wherein said geotextile fabric is a non-woven polypropylene product.
7. A pallet stacking board as claimed in claim 6 wherein said geotextile fabric is a non-woven polypropylene product having a smooth surface on one side, and a felt-like layer on the opposite side.
8. A pallet stacking board as claimed in claim 7 wherein said geotextile fabric has a weight of between 6 and 16 oz.
9. A pallet stacking board as claimed in claim 7 wherein said geotextile fabric has a weight of between 8 and 12 oz.
10. A pallet stacking board as claimed in claim 9 wherein said non-slip material forms a textured surface, on each of the upper and lower covering material surfaces.
11. A pallet stacking board as claimed in claim 1 wherein said non-slip surfaces are provided by a coating material applied to the fabric cover material layer.
12. A pallet stacking board as claimed in claim 11 wherein said fabric cover material layer has been pre-coated by passing said layer material through an extrusion coating process.
13. A pallet stacking board as claimed in claim 12 where said non-slip coating is a layer of a polypropylene/polyethylene copolymer.
14. A pallet stacking board as claimed in claim 13 wherein said polypropylene/polyethylene copolymer is applied at a thickness of between 0.002 and 0.005 inches.
15. A pallet stacking board as claimed in claim 14 wherein said non-slip coating additionally comprises pigments, anti-slip agents, UV stabilizers, or anti-microbial additives.
16. A pallet stacking board as claimed in claim 1 wherein said pallet stacking board has a width and length of between 80 and 120 cm, and a thickness of between 1.5 and 5 cm.
17. A pallet stacking board as claimed in claim 16 , wherein the corners of the pallet stacking board are truncated on a 45 degree angle.
18. A pallet stacking board as claimed in claim 1 wherein said board has an angle of friction, or non-slip angle, of more than 25 degrees.
19. A pallet stacking board as claimed in claim 18 wherein said board has an angle of friction, or non-slip angle, of more than 45 degrees.