EP1942061A1 - Koextrudierter Palettenblock - Google Patents

Koextrudierter Palettenblock Download PDF

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Publication number
EP1942061A1
EP1942061A1 EP07254761A EP07254761A EP1942061A1 EP 1942061 A1 EP1942061 A1 EP 1942061A1 EP 07254761 A EP07254761 A EP 07254761A EP 07254761 A EP07254761 A EP 07254761A EP 1942061 A1 EP1942061 A1 EP 1942061A1
Authority
EP
European Patent Office
Prior art keywords
pallet
inner core
outer shell
plastic
block
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP07254761A
Other languages
English (en)
French (fr)
Inventor
Johannes Wilhelmus Van De Camp
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sonoco Development Inc
Original Assignee
Sonoco Development Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sonoco Development Inc filed Critical Sonoco Development Inc
Publication of EP1942061A1 publication Critical patent/EP1942061A1/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D19/00—Pallets or like platforms, with or without side walls, for supporting loads to be lifted or lowered
    • B65D19/0004—Rigid pallets without side walls
    • B65D19/0053—Rigid pallets without side walls the load supporting surface being made of more than one element
    • B65D19/0077—Rigid pallets without side walls the load supporting surface being made of more than one element forming discontinuous or non-planar contact surfaces
    • B65D19/0089—Rigid pallets without side walls the load supporting surface being made of more than one element forming discontinuous or non-planar contact surfaces the base surface being made of more than one element
    • B65D19/0093—Rigid pallets without side walls the load supporting surface being made of more than one element forming discontinuous or non-planar contact surfaces the base surface being made of more than one element forming discontinuous or non-planar contact surfaces
    • B65D19/0095—Rigid pallets without side walls the load supporting surface being made of more than one element forming discontinuous or non-planar contact surfaces the base surface being made of more than one element forming discontinuous or non-planar contact surfaces and each contact surface having a stringer-like shape
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2519/00—Pallets or like platforms, with or without side walls, for supporting loads to be lifted or lowered
    • B65D2519/00004—Details relating to pallets
    • B65D2519/00009—Materials
    • B65D2519/00014—Materials for the load supporting surface
    • B65D2519/00029—Wood
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2519/00—Pallets or like platforms, with or without side walls, for supporting loads to be lifted or lowered
    • B65D2519/00004—Details relating to pallets
    • B65D2519/00009—Materials
    • B65D2519/00049—Materials for the base surface
    • B65D2519/00064—Wood
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2519/00—Pallets or like platforms, with or without side walls, for supporting loads to be lifted or lowered
    • B65D2519/00004—Details relating to pallets
    • B65D2519/00009—Materials
    • B65D2519/00084—Materials for the non-integral separating spacer
    • B65D2519/00109—Agglomerates, i.e. different materials mixed together
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2519/00—Pallets or like platforms, with or without side walls, for supporting loads to be lifted or lowered
    • B65D2519/00004—Details relating to pallets
    • B65D2519/00009—Materials
    • B65D2519/00119—Materials for the construction of the reinforcements
    • B65D2519/00144—Agglomerates, i.e. different materials mixed together
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2519/00—Pallets or like platforms, with or without side walls, for supporting loads to be lifted or lowered
    • B65D2519/00004—Details relating to pallets
    • B65D2519/00258—Overall construction
    • B65D2519/00263—Overall construction of the pallet
    • B65D2519/00273—Overall construction of the pallet made of more than one piece
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2519/00—Pallets or like platforms, with or without side walls, for supporting loads to be lifted or lowered
    • B65D2519/00004—Details relating to pallets
    • B65D2519/00258—Overall construction
    • B65D2519/00283—Overall construction of the load supporting surface
    • B65D2519/00293—Overall construction of the load supporting surface made of more than one piece
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2519/00—Pallets or like platforms, with or without side walls, for supporting loads to be lifted or lowered
    • B65D2519/00004—Details relating to pallets
    • B65D2519/00258—Overall construction
    • B65D2519/00313—Overall construction of the base surface
    • B65D2519/00323—Overall construction of the base surface made of more than one piece
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2519/00—Pallets or like platforms, with or without side walls, for supporting loads to be lifted or lowered
    • B65D2519/00004—Details relating to pallets
    • B65D2519/00258—Overall construction
    • B65D2519/00313—Overall construction of the base surface
    • B65D2519/00328—Overall construction of the base surface shape of the contact surface of the base
    • B65D2519/00333—Overall construction of the base surface shape of the contact surface of the base contact surface having a stringer-like shape
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2519/00—Pallets or like platforms, with or without side walls, for supporting loads to be lifted or lowered
    • B65D2519/00004—Details relating to pallets
    • B65D2519/00258—Overall construction
    • B65D2519/00368—Overall construction of the non-integral separating spacer
    • B65D2519/00373—Overall construction of the non-integral separating spacer whereby at least one spacer is made of one piece
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2519/00—Pallets or like platforms, with or without side walls, for supporting loads to be lifted or lowered
    • B65D2519/00004—Details relating to pallets
    • B65D2519/00258—Overall construction
    • B65D2519/00398—Overall construction reinforcements
    • B65D2519/00462—Applied in mold, e.g. bi-injection molded reinforcement
    • B65D2519/00477—Applied in mold, e.g. bi-injection molded reinforcement on or in the non-integral separating spacer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2519/00—Pallets or like platforms, with or without side walls, for supporting loads to be lifted or lowered
    • B65D2519/00004—Details relating to pallets
    • B65D2519/00547—Connections
    • B65D2519/00552—Structures connecting the constitutive elements of the pallet to each other, i.e. load supporting surface, base surface and/or separate spacer
    • B65D2519/00572—Structures connecting the constitutive elements of the pallet to each other, i.e. load supporting surface, base surface and/or separate spacer with separate auxiliary element, e.g. screws, nails, bayonets

Definitions

  • Embodiments of the present invention relate generally to co-extruded members. More particularly, embodiments of the invention relate to co-extruded pallet blocks and pallets constructed therewith.
  • pallets have been in use in product transportation for decades, many improvements in their designs and materials have been adopted and continue to appear.
  • Typical early pallets consisting of deckboards and stringers, were approachable by a forklift from one of two directions defined by the stringers. These are now accordingly called two-way pallets.
  • pallets approachable from any of four directions are preferred.
  • pallets having pallet blocks are popular as the spaces defined between the blocks typically permit approaches from any side of such a pallet.
  • a pallet constructed with solid wood pallet blocks typically has nails driven into the blocks either through or along the grain pattern. The nails are typically vertically disposed and the orientation of the pallet block defines the relationship of the grain pattern to the nails.
  • a solid wood pallet block having nails driven through the grain pattern typically exhibits high nail retrieval but poor impact resistance.
  • a pallet so constructed is therefore rigid and durable when heavy payloads are carefully lifted and transported but is unduly susceptible to damages, such as the splitting of a pallet block, when a forklift blade inadvertently strikes the pallet block.
  • a solid wood pallet block having nails driven along the grain pattern typically exhibits good impact resistance properties but poor nail retrieval.
  • a pallet so constructed may therefore fall apart from use as nails slip from the pallet blocks without impacts ever occurring.
  • a good pallet block would preferably have both high nail retrieval and high impact resistance.
  • Pallet blocks made of compressed wood shavings are free from overall grain patterns and offer some relief to the dilemma of choosing either high nail retrieval or high impact resistance.
  • pallet blocks tend to readily absorb water and expand.
  • a pallet constructed with compressed wood pallet blocks can therefore cause payload tipping when exposed to water.
  • a good pallet block would preferably be relatively stable in various humidity and weather conditions.
  • Improvements are needed toward pallet blocks having high nail retrieval, high impact resistance, and some degree of resistance to moisture.
  • a first aspect of the invention relates to a pallet block that includes an extruded inner core and an outer shell co-extruded with the inner core.
  • the outer shell surrounds the inner core with respect to an extrusion axis defined by the inner core.
  • the inner shell includes a foamed composition comprising a mixture of plastic and at least one of paper, wood, and metal.
  • the outer shell includes plastic and at least one of paper, wood, and metal.
  • the mass density of the outer shell is greater than the mass density of the inner core.
  • the outer shell may include a foamed composition.
  • the inner core may be more foamed than the outer shell.
  • Either or both of the inner core and outer shell may include product-packaging waste as a component of the compositions from which they are formed.
  • a second aspect of the invention relates to a pallet that includes at least one pallet member and a pallet block attached to the pallet member.
  • the pallet member may be a deckboard, a stringer, or a pallet deck.
  • the pallet block includes an extruded inner core and an outer shell co-extruded with the inner core.
  • the outer shell surrounds the inner core with respect to an extrusion axis defined by the inner core.
  • the inner shell includes a foamed composition of plastic and at least one of paper, wood, and metal.
  • the outer shell includes plastic and at least one of paper, wood, and metal.
  • the mass density of the outer shell is greater than the mass density of the inner core.
  • the pallet block may be attached to the pallet member by way of an elongate connector, such as a nail, disposed essentially parallel to the extrusion axis such that the connector is retained by the inner core without the connector contacting the outer shell.
  • a third aspect of the invention relates to a cargo item.
  • a pallet member is horizontally disposed beneath, and at least partially supports, a payload.
  • a pallet block is disposed beneath, and at least partially supports, the pallet member and the payload.
  • the pallet block includes an extruded inner core and an outer shell co-extruded with the inner core.
  • the outer shell surrounds the inner core about a vertical axis.
  • the outer shell may differ from the inner core in at least one of formula and mass density.
  • the outer shell may be connected together by a vertically disposed nail or screw that is retained by the inner core and that does not penetrate the outer shell.
  • the pallet 10 includes a number of pallet members and inventive pallet blocks 50. These descriptions relate to many pallet architectures.
  • the pallet 10 includes two types of pallet members. Pallet members of the first type, which are typically called stringers 12, are attached directly to the pallet blocks. Each particular stringer 12 is attached to and maintains the relative dispositions of a particular row of pallet blocks. Pallet members of the second type, which are typically called deckboards 14, abut the stringers 12 and are attached to the pallet blocks by way of the stringers. The stringers 12 perform as rails to which many deckboards 14 can be attached.
  • the various pallet members are connected to the pallet blocks 50 by elongate connectors 20 such as nails or screws.
  • openings 22 defined between the stringers, deckboards, and pallet blocks receive the lift members of forklifts, pallet trucks, pallet jacks, and other lifting apparatuses when the pallet is to be lifted and moved about.
  • the illustrated pallet 10 is typically called a four-way pallet because a forklift or the like can approach and lift the pallet from any of four directions due to the presence of openings 22 along four sides of the pallet.
  • the pallet 10 is shown in FIG. 1 in an inverted disposition relative to its typical orientation when used in transporting cargo. That is, a first face 18 defined by the many upper deckboards 14 typically faces upward and receives a payload disposed above the pallet.
  • the lower deckboards 16 typically define a base upon which the pallet rests.
  • the illustrated pallet 10 is typically called a single-faced pallet as the first face 18 is typically preferred for receiving a payload. It should be understood that these descriptions relate as well to a double-faced pallet that would be produced by supplementing the pallet 10 with additional lower deckboards 16 to define a second face for receiving a payload such that little or no distinction would remain for determining whether the pallet is inverted.
  • the pallet block 50 includes an extruded inner core 52 and an outer shell 54 co-extruded with the inner core.
  • the inner core and outer shell define an extrusion axis 56 as the movement axis along which is material advanced as the pallet block is extruded during its manufacture.
  • the pallet block is severed at opposing first and second ends 58 and 60 from a longer extruded member extending along the extrusion axis 56.
  • the outer shell surrounds the inner core with respect to the extrusion axis.
  • the opposing first and second ends 58 and 60 are each generally planar and each is disposed essentially perpendicular to the extrusion axis.
  • the outer shell is illustrated to include four generally planar sides 62, 64, 66, and 68 that are essentially parallel to the extrusion axis.
  • the sides 62, 64, 66, and 68 together define the outer shell as a continuous wall that surrounds and protects the inner core.
  • Edges 70 defined at the junctions of adjacent sides may be chamfered for guiding lifting members of forklifts and other lifting apparatuses into the openings 22 of the pallet.
  • the opposing first and second ends 58 and 60 of the pallet block 50 are illustrated as rectangular though these descriptions relate to other shapes. Indeed, any number of planar sides can be selected to define polygonal opposing ends of the pallet block.
  • a pallet block has eight generally planar sides and opposing octagonal ends.
  • a pallet block according to yet another embodiment of the invention has a cylindrical outer shell and circular opposing ends.
  • the inner core 52 comprises a foamed composition of plastic and at least one of paper, wood, and metal.
  • the inner core may consist of foamed and extruded product-packaging waste such as food-packaging waste.
  • product-packaging waste include laminated paperboard packaging waste materials such as tetrapack materials.
  • the inner core may include the materials of which tubular containers for packaging potato chips are constructed. Such tubular containers, referred to herein as composite containers, are constructed as cardboard tubes with inner liners made of plastic film and aluminum foil.
  • the inner core may include ground wood, film or plastic bags, and paper.
  • the inner core 52 comprises a foamed composition in that one or more foaming agents are introduced into the material of the inner core as the core is manufactured by extrusion.
  • a foamed composition may contain the introduced foaming agents, may contain some residual amount or by-product of the agents, or may remain foamed as a result of the activities of foaming agents without regard to whether any foaming agents remain in the final product.
  • an amount of hollow glass microspheres may be used as a foaming agent and, if so used, will typically remain in the final product.
  • a gas such as carbon-dioxide may be blown into an extrusion stream to produce a foamed composition though the gas may ultimately migrate from the final product or be replaced by ambient air.
  • the inner core 52 comprises a foamed composition having a mass density that may be selectively controlled by choice of the materials and foaming agents and their relative proportions, and the extrusion process used in manufacturing the composition.
  • the outer shell 54 comprises a composition of plastic and at least one of paper, wood, and metal.
  • the outer core may consist of foamed and extruded product-packaging waste such as food-packaging waste.
  • the outer shell may include ground and extruded cable shavings, plastic film or bags, wood, and paper.
  • the outer shell is co-extruded with the inner core and surrounds the inner core with respect to the extrusion axis 56.
  • the outer shell 54 may be a composition foamed by the introduction of a foaming agent into the material of the outer core as the outer core is co-extruded with the inner shell.
  • the outer shell and inner core differ in at least one of formula and mass density.
  • the formula of a composition relates to the materials and chemicals of which the composition consists.
  • a first foamed composition containing plastic, paper, and a foaming agent differs in formula from a second foamed composition containing plastic, paper, metal, and a foaming agent.
  • the mass density of a composition represents a measure of the mass of a composition divided by its volume, and may be expressed in arbitrary or standard units such as grams per cubic-centimeter. For example, two compositions differ in mass density if equal volumes of the two differ in mass.
  • outer shell and inner core differ in at least one of, and possibly both of, formula and mass density characterizes the shell and core as different compositions. Nonetheless, due to the nature of co-extruded products, some partial blending of their compositions may occur along the outer perimeter 72 of the inner core where the inner core 52 contacts the outer shell 54 ( FIG. 2 ).
  • the outer shell 54 of the pallet block 50 differs from the inner core 52 at least in mass density. More specifically, the outer shell 54 exhibits a higher mass density than the inner core 52 and protects the inner core from damage when the pallet block is struck, for example, by the lifting member of a forklift of other lifting apparatus.
  • the difference in the mass densities of the outer shell and inner core may be affected in a number of ways according to various embodiments of the invention.
  • the inner core and outer shell differ in formula merely with regard to the inner core being more foamed, and less dense, than the outer shell.
  • the outer shell contains relatively more plastic in its formula and may therefore protect the inner shell from moisture ingression.
  • FIG. 3 a cargo item according to at least one embodiment of the invention is illustrated in a partial cross-sectional view.
  • a payload 80 is shown representing products and materials transported upon, stored upon, or otherwise supported by, the pallet 10.
  • At least one pallet member is disposed beneath and at least partially supports the payload.
  • deckboards 14 and stringers 12 are disposed beneath and at least partially support the payload.
  • the pallet block 50 is disposed beneath and at least partially supports one or more pallet members and the payload.
  • the pallet block 50 includes an extruded inner core 52 and an outer shell 54 co-extruded with the inner core.
  • the pallet block 50 is oriented such that the outer shell surrounds the inner core with respect to a vertical axis 82.
  • the pallet members 14 and 12 are connected to the pallet block by a vertically disposed connector 20, such as a nail or screw. That is, in this example, the extrusion axis 56 ( FIG. 2 ) of the pallet block 50 is vertically disposed, essentially parallel to the vertical axis 82, such that the opposing first and second ends 58 and 60 of the pallet block are horizontally disposed to bear the forces imparted by the weight of the payload 80.
  • the elongate connectors 22 are disposed essentially parallel to extrusion axis defined by the inner core.
  • the connector is retained by the inner core 52 without the connector contacting or penetrating the outer shell 54.
  • nail retrieval which relates generally to the forces required to remove a nail from a host material, depends particularly on the composition of the inner core.
  • impact resistance which relates to the resistance of a pallet block against penetration by the tip of a forklift blade or other lifting member, depends upon the composition and thickness of the outer shell.
  • the inner core is surrounded by the outer shell and pallet members and is at least somewhat protected from environmental factors such as moisture.
  • a co-extruded pallet block according to the invention can be manufactured to have an overall mass density that is lower than a satisfactorily strong pallet block manufactured as a singly extruded member.
  • a singly extruded pallet block which does not separately define an inner core and outer shell, may exhibit an overall mass density as high as 1.4 grams per cubic-centimeter.
  • a co-extruded pallet block according to at least one embodiment of the invention can meet load-bearing expectations in pallet transportation industries and yet exhibit an overall mass density of 1.13 grams per cubic-centimeter.
  • the co-extruded pallet block has an outer shell exhibiting a mass density of approximately 1.3 to 1.4 grams per cubic-centimeter and an inner core exhibiting a mass density of approximately 0.9 grams per cubic centimeter.
  • the overall weight and strength of the pallet block can be varied by selection of the formulas and mass densities of the inner core and outer shell.
  • the density of the inner core may be minimized so that a lightweight pallet block that benefits from a protective outer shell can be manufactured.
  • the nail retrieval and impact resistance properties of the pallet block can be separately varied to obtain an optimal performance.
  • Optimal performance of the pallet block may not entail the highest achievable nail retrieval in all situations. For example, in a situation where expensive hardwood pallet members are used, moderate nail retrieval properties may be preferred in order to preserve the condition of the pallet members in circumstances where a pallet is damaged. In such a situation, it may be economically advantageous to select a pallet block that is more fragile than the pallet members.
  • the overall enterprise of manufacturing, using, and repairing pallets benefits from the inventive pallet block 50, which can be manufactured to meet any of a variety of specifications.
  • Table 1 demonstrates that a pallet block according to the invention can be manufactured according to a variety of specifications toward overall mass, nail retention, and impact resistance.
  • the table provides measured values for total mass, nail retention (NR), and impact resistance (IR) for each of five pallet blocks.
  • the formula for the outer shell of each pallet block is expressed in the table in terms of the contributions of particular materials to the mass of the outer shell.
  • the formula for the inner core of each pallet block is similarly expressed. For example, regarding the second pallet block, the outer shell is seventy percent wood shavings and thirty percent polyethylene film by mass, and the inner core is fifty percent aluminum foil and fifty percent polyethylene film by mass.
  • Nail retrieval forces were measured according to the D1761-06 ASTM standard test, which entails measuring the force required to remove a connector from a host material. For some of the five pallet blocks listed below, nail retrieval was measured several times and a range is provided in the table. For example, several nail retrieval measurements for each of blocks 2, 3, and 5, provided results between a minimum of three hundred and forty two pounds and a maximum of four hundred and forty pounds. Impact resistance was measured according to a proprietary method that entails measuring the force required for a metal probe to penetrate a pallet block.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pallets (AREA)
EP07254761A 2007-01-02 2007-12-08 Koextrudierter Palettenblock Withdrawn EP1942061A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US11/619,074 US20080156234A1 (en) 2007-01-02 2007-01-02 Co-extruded pallet block

Publications (1)

Publication Number Publication Date
EP1942061A1 true EP1942061A1 (de) 2008-07-09

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP07254761A Withdrawn EP1942061A1 (de) 2007-01-02 2007-12-08 Koextrudierter Palettenblock

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