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FR2836895A1 - Method of forming plastic pallet structure comprises inserting and adhering projections of one component into cavities of second component - Google Patents

Method of forming plastic pallet structure comprises inserting and adhering projections of one component into cavities of second component Download PDF

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Publication number
FR2836895A1
FR2836895A1 FR0301396A FR0301396A FR2836895A1 FR 2836895 A1 FR2836895 A1 FR 2836895A1 FR 0301396 A FR0301396 A FR 0301396A FR 0301396 A FR0301396 A FR 0301396A FR 2836895 A1 FR2836895 A1 FR 2836895A1
Authority
FR
France
Prior art keywords
cavity
projection
component
plastic
cavities
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.)
Granted
Application number
FR0301396A
Other languages
French (fr)
Other versions
FR2836895B1 (en
Inventor
Bernard Forment
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.)
IPS NV
Original Assignee
IPS NV
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
Priority claimed from BE2002/0084A external-priority patent/BE1014633A6/en
Application filed by IPS NV filed Critical IPS NV
Publication of FR2836895A1 publication Critical patent/FR2836895A1/en
Application granted granted Critical
Publication of FR2836895B1 publication Critical patent/FR2836895B1/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

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
    • B65D19/0006—Rigid pallets without side walls the load supporting surface being made of a single element
    • B65D19/0008—Rigid pallets without side walls the load supporting surface being made of a single element forming a continuous plane contact surface
    • B65D19/002—Rigid pallets without side walls the load supporting surface being made of a single element forming a continuous plane contact surface the base surface being made of more than one element
    • B65D19/0024—Rigid pallets without side walls the load supporting surface being made of a single element forming a continuous plane contact surface the base surface being made of more than one element forming discontinuous or non-planar contact surfaces
    • B65D19/0026—Rigid pallets without side walls the load supporting surface being made of a single element forming a continuous plane contact surface 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
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/66—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by liberation of internal stresses, e.g. shrinking of one of the parts to be joined
    • B29C65/665—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by liberation of internal stresses, e.g. shrinking of one of the parts to be joined using shrinking during cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/54—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/47—Joining single elements to sheets, plates or other substantially flat surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/737—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined
    • B29C66/7377—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined amorphous, semi-crystalline or crystalline
    • B29C66/73771—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined amorphous, semi-crystalline or crystalline the to-be-joined area of at least one of the parts to be joined being amorphous
    • B29C66/73772—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined amorphous, semi-crystalline or crystalline the to-be-joined area of at least one of the parts to be joined being amorphous the to-be-joined areas of both parts to be joined being amorphous
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/737—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined
    • B29C66/7377—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined amorphous, semi-crystalline or crystalline
    • B29C66/73773—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined amorphous, semi-crystalline or crystalline the to-be-joined area of at least one of the parts to be joined being semi-crystalline
    • B29C66/73774—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined amorphous, semi-crystalline or crystalline the to-be-joined area of at least one of the parts to be joined being semi-crystalline the to-be-joined areas of both parts to be joined being semi-crystalline
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/737—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined
    • B29C66/7377—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined amorphous, semi-crystalline or crystalline
    • B29C66/73775—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined amorphous, semi-crystalline or crystalline the to-be-joined area of at least one of the parts to be joined being crystalline
    • B29C66/73776—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined amorphous, semi-crystalline or crystalline the to-be-joined area of at least one of the parts to be joined being crystalline the to-be-joined areas of both parts to be joined being crystalline
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/712—Containers; Packaging elements or accessories, Packages
    • B29L2031/7178—Pallets
    • 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
    • B65D2519/00034—Plastic
    • 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
    • B65D2519/00069—Plastic
    • 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
    • B65D2519/00288—Overall construction of the load supporting surface 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
    • B65D2519/00283—Overall construction of the load supporting surface
    • B65D2519/00308—Overall construction of the load supporting surface grid type, e.g. perforated plate
    • 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
    • B65D2519/00398—Overall construction reinforcements
    • B65D2519/00402—Integral, e.g. ribs
    • B65D2519/00407—Integral, e.g. ribs on the load supporting surface
    • 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
    • B65D2519/00402—Integral, e.g. ribs
    • B65D2519/00412—Integral, e.g. ribs on the base surface
    • 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
    • B65D2519/00557—Structures connecting the constitutive elements of the pallet to each other, i.e. load supporting surface, base surface and/or separate spacer without separate auxiliary elements

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pallets (AREA)

Abstract

Method of forming plastic pallet structure comprises inserting and adhering projections of one component into cavities of second component. Method of forming plastic structure comprises inserting and adhering projections of one component into cavities of second component. Projections of the second part are inserted into cavities (7, 8, 9) of the first part. This occurs when the ultimate contraction potential of the first part exceeds that of the second. Each projection is adhered into its corresponding cavity. Precisely-fitting projections and cavities form a closed assembly, sealed from the air, following final contraction. The projection is pressed into the cavity immediately after application of adhesive. An Independent claim is included for the corresponding plastic structure.

Description

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Structure portante en matière plastique et procédé pour sa fabrication La présente invention concerne d'une part un procédé pour la fabrication d'une structure portante en matière plastique, comprenant une première partie avec au moins une cavité et une deuxième partie avec au moins une saillie qui s'adapte dans une cavité de la première partie et d'autre part une structure portante en matière plastique fabriquée suivant un tel procédé.  Supporting structure in plastic material and method for its production The present invention relates, on the one hand, to a method for manufacturing a carrying structure in plastic material, comprising a first part with at least one cavity and a second part with at least one projection. which fits in a cavity of the first part and on the other hand a supporting structure of plastic material manufactured according to such a process.

Par structure portante en matière plastique, on entend dans la présente demande de brevet : des conteneurs, des plates-formes de support, des plates-formes, des plateaux,... qui sont principalement constitués de matière plastique. By plastic bearing structure is meant in this patent application: containers, support platforms, platforms, trays, ... which are mainly made of plastic.

La présente invention concerne en particulier un procédé pour la fabrication d'une structure de palette en matière plastique, ainsi qu'une telle structure de palette. The present invention relates in particular to a method for manufacturing a plastic pallet structure, as well as such a pallet structure.

Une première manière connue de fabriquer une palette en matière plastique consiste à mouler par injection, via une seule opération d'injection, une palette formant un tout, on utilise à cet effet une seule matrice, pourvue d'éléments de tirage de noyaux. A first known way of manufacturing a plastic pallet consists of injection molding, via a single injection operation, a pallet forming a whole, a single die is used for this purpose, provided with core pulling elements.

Ce procédé présente cependant l'inconvénient que la matrice, nécessaire pour la fabrication de palettes de ce type, est très coûteuse en raison de son montage complexe (présence des éléments dits de tirage de noyaux). En outre, il n'est possible de fabriquer de façon économique avec une telle matrice que des palettes ayant une épaisseur de paroi maximale de 8 mm. However, this method has the disadvantage that the matrix, necessary for the manufacture of pallets of this type, is very expensive because of its complex assembly (presence of the so-called core pulling elements). Furthermore, it is only possible to economically manufacture with such a matrix pallets having a maximum wall thickness of 8 mm.

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Dans le brevet américain US 3 938 448, on décrit un procédé pour la fabrication d'une palette, composée de deux parties produites séparément. Les parties, respectivement a et b, sont fusionnées l'une à l'autre. Cette fusion mutuelle est réalisée en chauffant les surfaces de contact de a et b à l'aide d'une plaque chauffante, celles-ci étant ensuite pressées l'une contre l'autre après l'enlèvement de la plaque chauffante. Après le refroidissement, on obtient une palette formant un tout, dont on doit cependant dire que l'assemblage entre a et b est moins résistant et moins fiable parce que la surface de contact entre les deux parties n'est pas tellement grande.  In US Patent 3,938,448, a method for manufacturing a pallet is described, consisting of two parts produced separately. The parts, respectively a and b, are merged with each other. This mutual fusion is achieved by heating the contact surfaces of a and b using a heating plate, these then being pressed against each other after the removal of the heating plate. After cooling, a pallet forming a whole is obtained, of which it must however be said that the assembly between a and b is less resistant and less reliable because the contact surface between the two parts is not so large.

Une autre méthode pour assembler a et b l'une à l'autre fait appel à un certain nombre d'assemblages mécaniques, par exemple des assemblages par encliquetage. Cette technique d'assemblage est également moins résistante et moins fiable parce que les assemblages par encliquetage mis en place peuvent aisément se briser lors de manipulations de la palette. Another method for joining a and b to each other uses a certain number of mechanical assemblies, for example snap-on assemblies. This assembly technique is also less resistant and less reliable because the snap-in assemblies put in place can easily break during handling of the pallet.

Une autre technique d'assemblage est décrite dans la publication de brevet britannique UK 2 078 600. Suivant cette méthode, deux parties, qui ont été produites à des températures différentes, sont engagées l'une dans l'autre et ensuite réchauffées jusqu'au-delà de leur température de recristallisation. Après le refroidissement, il se produit un assemblage robuste provoqué par une différence de retrait entre les deux parties. Another assembly technique is described in British patent publication UK 2,078,600. According to this method, two parts, which have been produced at different temperatures, are engaged one in the other and then reheated until beyond their recrystallization temperature. After cooling, a robust assembly occurs caused by a difference in shrinkage between the two parts.

La différence de retrait est due au fait que les parties ont été formées avec une température de matrice différente. The difference in shrinkage is due to the fact that the parts have been formed with a different die temperature.

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Le procédé décrit dans UK 2 078 600 est très coûteux, long et compliqué, parce que l'on doit d'abord fabriquer les parties séparément, ensuite les réchauffer et les laisser refroidir. The process described in UK 2,078,600 is very expensive, time consuming and complicated, because the parts must first be made separately, then reheated and allowed to cool.

En outre, ce procédé n'est applicable qu'avec des substances cristallines et en particulier le polyacétal, qui est très cher. In addition, this process is only applicable with crystalline substances and in particular polyacetal, which is very expensive.

L'objet de la présente invention est de procurer un procédé suivant lequel on fabrique une structure portante en matière plastique comportant au moins deux parties, qui ne présente plus les inconvénients rappelés plus haut. The object of the present invention is to provide a method according to which a plastic bearing structure is produced comprising at least two parts, which no longer has the drawbacks mentioned above.

L'objectif de l'invention est atteint en prévoyant un procédé pour la fabrication d'une structure portante en matière plastique comportant une première partie avec au moins une cavité et une seconde partie avec au moins une saillie qui s'adapte dans une cavité de la première partie, dans lequel la saillie est placée dans la cavité à l'instant où la première partie présente une plus grande capacité de retrait final que la seconde partie et dans lequel chaque saillie précitée de la seconde partie est collée dans une cavité de la première partie. The object of the invention is achieved by providing a method for the manufacture of a load-bearing plastic structure comprising a first part with at least one cavity and a second part with at least one projection which fits into a cavity of the first part, in which the projection is placed in the cavity at the moment when the first part has a greater capacity of final withdrawal than the second part and in which each aforementioned projection of the second part is glued in a cavity of the first part.

Ceci présente l'avantage qu'il s'établit un assemblage robuste entre les deux parties, parce que la première partie, après le retrait final complet, entoure entièrement la saillie de la seconde partie. Les insuffisances éventuelles dans l'assemblage qui pourraient éventuellement apparaître pendant le retrait final sont compensées complètement par l'assemblage collé supplémentaire. This has the advantage that a robust connection is established between the two parts, because the first part, after the complete final removal, completely surrounds the projection of the second part. Any shortcomings in the assembly which could possibly appear during the final removal are completely compensated for by the additional bonded assembly.

Par la combinaison du collage supplémentaire avec le retrait final, on obtient un avantage additionnel, à savoir l'effet de vide qui permet d'obtenir un ensemble solide et robuste. By combining the additional bonding with the final shrinkage, an additional advantage is obtained, namely the vacuum effect which makes it possible to obtain a solid and robust assembly.

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Il convient cependant de remarquer que l'effet de retrait mentionné plus haut n'est pas le même que le retrait final utilisé ensuite dans la présente description. Le retrait final est la diminution de volume qui se produit pendant le refroidissement de pièces nouvellement produites, et ceci n'est pas la même chose que la diminution de volume qui se produit pendant le refroidissement de pièces réchauffées. It should however be noted that the withdrawal effect mentioned above is not the same as the final withdrawal used subsequently in this description. Final shrinkage is the decrease in volume that occurs during the cooling of newly produced parts, and this is not the same thing as the decrease in volume that occurs during the cooling of heated parts.

Par comparaison avec le retrait décrit dans UK 2 078 600, le retrait final offre l'avantage qu'il peut être réalisé de façon simple et en économisant de l'énergie (utilise la même température de matrice). Compared with the shrinkage described in UK 2,078,600, the final shrinkage offers the advantage that it can be carried out in a simple manner and while saving energy (uses the same matrix temperature).

Suivant une forme de réalisation préférée du procédé de l'invention, il se forme un ensemble fermé étanche à l'air, après le placement d'une saillie exactement dimensionnée dans une cavité exactement dimensionnée, et de ce fait les parties peuvent difficilement être séparées par suite de l'effet dit de vide. According to a preferred embodiment of the method of the invention, an airtight closed assembly is formed, after the placement of an exactly dimensioned projection in an exactly dimensioned cavity, and therefore the parts can hardly be separated. as a result of the so-called vacuum effect.

Ceci présente l'avantage supplémentaire que l'assemblage entre les deux parties est encore plus résistant. This has the additional advantage that the assembly between the two parts is even more resistant.

Le procédé suivant l'invention est applicable aux matières plastiques tant cristallines que partiellement cristallines ou amorphes. De ce fait, on peut travailler avec de nombreuses matières plastiques moins coûteuses, contrairement au procédé décrit dans UK 2 078 600, où l'on ne peut travailler qu'avec des matières cristallines, en particulier du polyacétal. The process according to the invention is applicable to plastics which are both crystalline and partially crystalline or amorphous. Therefore, one can work with many less expensive plastics, unlike the process described in UK 2,078,600, where one can only work with crystalline materials, in particular polyacetal.

Suivant une forme de réalisation particulière du procédé suivant l'invention, la colle se compose de préférence d'une According to a particular embodiment of the method according to the invention, the adhesive preferably consists of a

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colle par fusion à chaud (hotmelt), étant donné qu'aucun traitement préparatoire de la surface n'est alors nécessaire.  hot melt adhesive, since no preparatory surface treatment is necessary.

Suivant une forme de réalisation particulière du procédé suivant l'invention, on utilise avec des polyoléfines un système de hotmelt à base de polypropylène atactique. According to a particular embodiment of the process according to the invention, a hotmelt system based on atactic polypropylene is used with polyolefins.

Ceci offre l'avantage que l'on peut travailler sans solvant, ce qui permet de concevoir des palettes utilisables dans l'industrie alimentaire. This offers the advantage that one can work without solvent, which makes it possible to design pallets usable in the food industry.

Un avantage supplémentaire que l'on obtient en utilisant un tel système de hotmelt est que la structure portante en matière plastique reste entièrement recyclable, ce qui confirme l'aspect économique de la fabrication de palettes de cette nature. An additional advantage which is obtained by using such a hotmelt system is that the carrying structure in plastic material remains entirely recyclable, which confirms the economic aspect of the manufacture of pallets of this nature.

Suivant une forme de réalisation du procédé suivant l'invention, une saillie exactement dimensionnée est pressée dans la cavité immédiatement après l'application de la colle dans la cavité de la première partie. According to one embodiment of the method according to the invention, an exactly dimensioned projection is pressed into the cavity immediately after the application of the adhesive in the cavity of the first part.

Du fait que la première partie est pressée dans la seconde partie, la colle peut se répandre sur une grande surface de contact, idéalement même sur toute la surface de contact. Ceci présente l'avantage que l'adhérence sera optimale. Because the first part is pressed into the second part, the adhesive can spread over a large contact surface, ideally even over the entire contact surface. This has the advantage that the grip will be optimal.

Un autre objet de la présente invention est une structure portante en matière plastique comprenant une première partie avec au moins une cavité et une seconde partie avec au moins une saillie, qui est fabriquée conformément au procédé suivant la présente invention. Another object of the present invention is a supporting structure of plastic material comprising a first part with at least one cavity and a second part with at least one projection, which is produced according to the method according to the present invention.

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L'avantage de celle-ci est qu'en appliquant le procédé suivant l'invention, on obtient une structure portante en matière plastique extraordinairement résistante et robuste. The advantage of this is that by applying the method according to the invention, a bearing structure of extraordinarily strong and robust plastic is obtained.

Suivant une forme de réalisation préférée de la structure portante en matière plastique suivant l'invention, chaque saillie est exécutée sous la forme d'un premier élément tubulaire qui est contenu dans l'espace intérieur creux d'un deuxième élément tubulaire, de façon à obtenir une structure à double paroi. According to a preferred embodiment of the plastic supporting structure according to the invention, each projection is executed in the form of a first tubular element which is contained in the hollow interior space of a second tubular element, so as to obtain a double wall structure.

L'avantage de celle-ci est que la double paroi ainsi formée assure une plus grande résistance à l'impact contre par exemple des chocs accidentels des fourches d'un élévateur à fourche. The advantage of this is that the double wall thus formed provides greater resistance to impact against, for example, accidental impacts from the forks of a forklift.

Suivant une forme de réalisation particulière de la structure portante en matière plastique suivant l'invention, ladite structure portante en matière plastique est une palette, dans laquelle ladite première partie constitue le plateau supérieur, ladite seconde partie le plateau inférieur, et lesdits éléments tubulaires forment les éléments de liaison entre le plateau supérieur et le plateau inférieur. According to a particular embodiment of the plastic bearing structure according to the invention, said plastic bearing structure is a pallet, in which said first part constitutes the upper plate, said second part constitutes the lower plate, and said tubular elements form the connecting elements between the upper plate and the lower plate.

Il apparaît ainsi une palette dans laquelle l'assemblage entre les éléments exécutés séparément (plateau supérieur et plateau inférieur) est extrêmement robuste et fiable. It thus appears a palette in which the assembly between the elements executed separately (upper plate and lower plate) is extremely robust and reliable.

Pour expliciter davantage les propriétés de la présente invention et pour indiquer des avantages et de détails supplémentaires de celle-ci, on présente ci-dessous une description détaillée du procédé appliqué et d'une structure portante en matière plastique fabriquée suivant ce procédé. Il doit être clair qu'aucun élément de la description qui suit ne To further explain the properties of the present invention and to indicate further advantages and details thereof, a detailed description is given below of the process applied and of a load-bearing plastic structure produced by this process. It should be clear that nothing in the description which follows

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peut être interprété comme constituant une limitation de la protection demandée pour la présente invention dans les revendications qui suivent.  may be interpreted as constituting a limitation of the protection requested for the present invention in the claims which follow.

Dans cette description, il est fait référence, au moyen de repères numériques, aux dessins annexés dans lesquels la Figure 1 est une représentation en perspective d'une structure de palette en matière plastique ; la Figure 2 montre une coupe transversale du plateau supérieur (première partie) de la structure de palette en matière plastique ; et la Figure 3 est une représentation en perspective d'un élément du plateau inférieur (seconde partie) de la structure de palette en matière plastique. In this description, reference is made, by means of reference numerals, to the appended drawings in which FIG. 1 is a perspective representation of a plastic pallet structure; Figure 2 shows a cross section of the upper plate (first part) of the plastic pallet structure; and Figure 3 is a perspective representation of an element of the lower plate (second part) of the plastic pallet structure.

La structure de palette en matière plastique, fabriquée suivant l'invention, et telle qu'elle est représentée dans les figures 1 à 3, est composée d'un plateau supérieur (1), pourvu de trois rangées comportant chacune trois pieds creux (7), (8), (9) et d'au moins un plateau inférieur robuste (2,3, 4) composé de trois éléments (2), (3), (4) comportant chacun trois saillies tubulaires (11), (12), (13), qui s'adaptent géométriquement dans les pieds creux (7), (8), (9) du plateau supérieur (1). The plastic pallet structure, manufactured according to the invention, and as shown in Figures 1 to 3, is composed of an upper plate (1), provided with three rows each comprising three hollow feet (7 ), (8), (9) and at least one robust lower plate (2,3, 4) composed of three elements (2), (3), (4) each comprising three tubular projections (11), ( 12), (13), which fit geometrically in the hollow feet (7), (8), (9) of the upper plate (1).

Le plateau supérieur (1), tel qu'il est représenté dans les figures 1 et 2, est de préférence fabriqué avec les matières plastiques classiques telles que les copolymères HDPE et PP ou en un autre polymère thermoplastique. Ces matières peuvent également être aussi bien des matières recyclées que des matières premières vierges. The upper plate (1), as shown in Figures 1 and 2, is preferably made with conventional plastics such as HDPE and PP copolymers or another thermoplastic polymer. These materials can also be recycled materials as well as virgin raw materials.

Le plateau supérieur (1) est fabriqué suivant l'une des techniques suivantes : moulage par injection à haute pression, The upper plate (1) is produced using one of the following techniques: high pressure injection molding,

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moulage par injection à basse pression (avec structure cellulaire), moulage par injection avec injection de gaz ou d'eau, ou injection-compression.  low pressure injection molding (with cell structure), injection molding with gas or water injection, or compression injection.

Selon la classe de chargement demandée, la face inférieure du plateau supérieur (1) est pourvue d'une structure nervurée, cette structure nervurée est obtenue en fabriquant le plateau supérieur (1) par moulage par injection avec une injection de gaz, il se forme ainsi des nervures avec des canaux à gaz (10), permettant d'obtenir des rigidités plus élevées. According to the requested loading class, the lower face of the upper plate (1) is provided with a ribbed structure, this ribbed structure is obtained by manufacturing the upper plate (1) by injection molding with a gas injection, it forms thus ribs with gas channels (10), making it possible to obtain higher rigidities.

Selon le domaine d'application de la palette, la surface du plateau supérieur (1) est entièrement fermée ou bien la surface présente des ouvertures (5), comme le montre la figure 1. Depending on the field of application of the pallet, the surface of the upper plate (1) is completely closed or the surface has openings (5), as shown in Figure 1.

En outre, le plateau supérieur (1) est pourvu sur sa face inférieure des cavités tubulaires nécessaires (7,8, 9), dans lesquelles les saillies tubulaires (11,12, 13) du plateau inférieur (2,3, 4) seront installées. In addition, the upper plate (1) is provided on its underside with the necessary tubular cavities (7,8, 9), in which the tubular projections (11,12, 13) of the lower plate (2,3, 4) will be installed.

Le plateau inférieur (2) de la structure de palette en matière plastique peut, tout comme le plateau supérieur (1), être fabriqué avec les copolymères HDPE, PP ou en un autre polymère thermoplastique, ces matières premières pouvant être vierges ou recyclées. The lower plate (2) of the plastic pallet structure can, like the upper plate (1), be manufactured with the HDPE, PP or other thermoplastic polymer copolymers, these raw materials being able to be virgin or recycled.

On peut également appliquer les mêmes techniques de fabrication que pour la fabrication du plateau supérieur (1). The same manufacturing techniques can also be applied as for the manufacture of the upper plate (1).

La palette représentée dans les figures est une europalette, dont le plateau inférieur (2,3, 4) est composé de trois éléments séparés ( (2), (3), (4), chacun avec trois saillies tubulaires (11), (12), (13), qui s'adaptent géométriquement The pallet shown in the figures is a europallet, the lower plate (2,3, 4) of which is composed of three separate elements ((2), (3), (4), each with three tubular projections (11), ( 12), (13), which fit geometrically

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dans les cavités tubulaires (7), (8), (9) du plateau supérieur (1), prévues en une rangée. Les trois éléments séparés (2), (3), (4) sont la plupart du temps de robustes lattes épaisses, qui sont pourvues d'un chanfrein (6), pour permettre l'entrée et la sortie confortables de transpalettes manuels.  in the tubular cavities (7), (8), (9) of the upper plate (1), provided in a row. The three separate elements (2), (3), (4) are mostly robust thick slats, which are provided with a chamfer (6), to allow comfortable entry and exit of manual pallet trucks.

Les différents éléments de la structure portante en matière plastique sont façonnés avec des matrices séparées, qui dans ce cas sont de simples matrices à ouvrir-fermer, sans éléments de tirage de noyaux. Le plateau inférieur (2,3, 4) est fabriqué suffisamment longtemps à l'avance, de telle sorte qu'il a déjà effectué son retrait final à l'instant où le plateau supérieur (1) est fabriqué. The various elements of the plastic supporting structure are shaped with separate dies, which in this case are simple open-close dies, without core pulling elements. The lower plate (2,3, 4) is manufactured sufficiently in advance, so that it has already made its final withdrawal at the time when the upper plate (1) is produced.

Immédiatement après la fabrication du plateau supérieur (1), le plateau supérieur (1) et le plateau inférieur (2) sont d'abord positionnés exactement l'un par rapport à l'autre. Ensuite, on injecte dans les cavités (7,8, 9) du plateau supérieur (1), qui sont orientées vers le haut, une colle appropriée, de préférence une hotmelt, en quantité suffisante pour couvrir entièrement la surface de contact. Immediately after manufacture of the upper plate (1), the upper plate (1) and the lower plate (2) are first positioned exactly in relation to each other. Then injected into the cavities (7,8, 9) of the upper plate (1), which are oriented upwards, a suitable glue, preferably a hotmelt, in sufficient quantity to completely cover the contact surface.

Dans le cas où les différents éléments de la structure de palette en matière plastique sont fabriqués avec des polyoléfines, la préférence est donnée à un système de hotmelt à base de propylène atactique. Ainsi, du fait que l'on travaille totalement sans solvants, la palette peut être utilisée sans problème dans l'industrie alimentaire, et la palette reste complètement recyclable. In the case where the various elements of the plastic pallet structure are manufactured with polyolefins, preference is given to a hotmelt system based on atactic propylene. Thus, because we work completely without solvents, the pallet can be used without problem in the food industry, and the pallet remains completely recyclable.

Immédiatement après l'application de la colle, la saillie tubulaire ( (11), (12), (13) de chaque élément (2), (3), (4) du plateau inférieur est pressée dans les cavités tubulaires (7), (8), (9) pourvues de colle d'une rangée respective de cavités Immediately after applying the adhesive, the tubular projection ((11), (12), (13) of each element (2), (3), (4) of the lower plate is pressed into the tubular cavities (7) , (8), (9) provided with adhesive of a respective row of cavities

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du plateau supérieur (1), la colle se répandant ainsi sur une grande surface de contact, en particulier, idéalement même sur la totalité de la surface de contact.  of the upper plate (1), the adhesive thus spreading over a large contact surface, in particular, ideally even over the entire contact surface.

De cette manière, avec un dimensionnement exact des pièces, on obtient un assemblage idéal du plateau inférieur (2,3, 4) sur le plateau supérieur (1). Cette adhérence est basée sur trois phénomènes : - l'effet de collage de la colle ;

Figure img00100001

- l'effet de retrait final du plateau supérieur (1) ; - l'effet de vide entre les deux parties. Dans le cas où les saillies tubulaires (11,12, 13) du plateau inférieur (2,3, 4) sont creuses, il apparaît après l'assemblage du plateau inférieur (2,3, 4) au plateau supérieur (1) une double paroi, et ainsi la palette présente une grande résistance aux chocs et on résout un problème classique des palettes en matière plastique, à savoir la faible résistance aux impacts accidentels par les fourches des chariots élévateurs par exemple. In this way, with an exact dimensioning of the parts, an ideal assembly of the lower plate (2,3, 4) is obtained on the upper plate (1). This adhesion is based on three phenomena: - the gluing effect of the glue;
Figure img00100001

- the effect of final withdrawal of the upper plate (1); - the vacuum effect between the two parts. In the case where the tubular projections (11, 12, 13) of the lower plate (2,3, 4) are hollow, it appears after the assembly of the lower plate (2,3, 4) to the upper plate (1) a double wall, and thus the pallet has a high impact resistance and a conventional problem of plastic pallets is solved, namely the low resistance to accidental impacts by the forks of forklifts for example.

Finalement, il convient encore de remarquer qu'en plus de la palette décrite ci-dessus, dans laquelle le plateau inférieur (2,3, 4) est composé de trois éléments séparés (2), (3), (4), il existe également encore des palettes avec un plateau inférieur en un seul élément, par exemple des palettes avec un fond croisé.Finally, it should also be noted that in addition to the palette described above, in which the lower plate (2,3, 4) is composed of three separate elements (2), (3), (4), there There are also still pallets with a lower tray in a single element, for example pallets with a crossed bottom.

Claims (9)

REVENDICATIONS 1. Procédé pour la fabrication d'une structure portante en matière plastique comportant une première partie avec au moins une cavité (7), (8), (9) et une seconde partie avec au moins une saillie (11), (12), (13) qui s'adapte dans une cavité (7), (8), (9) de la première partie, caractérisé en ce que la saillie (11), (12), (13) est placée dans la cavité (7), (8), (9) à l'instant où la première partie présente une plus grande capacité de retrait final que la seconde partie et dans lequel chaque saillie précitée (11), (12), (13) de la seconde partie est collée dans une cavité (7), (8), (9) de la première partie. CLAIMS 1. Method for manufacturing a bearing structure in plastic material comprising a first part with at least one cavity (7), (8), (9) and a second part with at least one projection (11), (12 ), (13) which fits into a cavity (7), (8), (9) of the first part, characterized in that the projection (11), (12), (13) is placed in the cavity (7), (8), (9) at the moment when the first part has a greater capacity for final withdrawal than the second part and in which each aforementioned projection (11), (12), (13) of the second part is glued into a cavity (7), (8), (9) of the first part. 2. Procédé suivant la revendication 1, caractérisé en ce qu'il se forme un ensemble fermé étanche à l'air, après le placement d'une saillie exactement dimensionnée (11), (12), (13) dans une cavité exactement dimensionnée (7), (8), (9) et après le retrait final complet. 2. Method according to claim 1, characterized in that an airtight closed assembly is formed, after the placement of an exactly dimensioned projection (11), (12), (13) in an exactly dimensioned cavity. (7), (8), (9) and after complete final withdrawal. 3. Procédé suivant la revendication 1 ou 2, caractérisé en ce que la matière plastique utilisée est une matière amorphe ou partiellement cristalline. 3. Method according to claim 1 or 2, characterized in that the plastic material used is an amorphous or partially crystalline material. 4. Procédé suivant l'une quelconque des revendications précédentes, caractérisé en ce que la colle est constituée d'une hotmelt. 4. Method according to any one of the preceding claims, characterized in that the adhesive consists of a hotmelt. 5. Procédé suivant la revendication 4, caractérisé en ce que pour les polyoléfines, on utilise un système de hotmelt à base de polypropylène atactique. 5. Method according to claim 4, characterized in that for the polyolefins, a hotmelt system based on atactic polypropylene is used. <Desc/Clms Page number 12><Desc / Clms Page number 12> 6. Procédé suivant l'une quelconque des revendications précédentes, caractérisé en ce que ladite saillie (11), (12), (13) est pressée dans la cavité (7), (8), (9) immédiatement après l'application de la colle dans cette cavité (7), (8), (9) de la première partie.  6. Method according to any one of the preceding claims, characterized in that said projection (11), (12), (13) is pressed into the cavity (7), (8), (9) immediately after application glue in this cavity (7), (8), (9) of the first part. 7. Structure portante en matière plastique, comprenant une première partie avec au moins une cavité (7), (8), (9) et une seconde partie avec au moins une saillie (11), (12), (13), caractérisée en ce que la structure portante en matière plastique est fabriquée suivant l'une des revendications précédentes. 7. Plastic supporting structure, comprising a first part with at least one cavity (7), (8), (9) and a second part with at least one projection (11), (12), (13), characterized in that the supporting plastic structure is produced according to one of the preceding claims. 8. Structure portante en matière plastique suivant la revendication 7, caractérisée en ce que chaque saillie (11), (12), (13) est exécutée sous la forme d'un premier élément tubulaire et est contenue dans l'espace intérieur creux d'un deuxième élément tubulaire, de façon à obtenir une structure à double paroi. 8. Plastic supporting structure according to claim 7, characterized in that each projection (11), (12), (13) is executed in the form of a first tubular element and is contained in the hollow interior space d 'a second tubular element, so as to obtain a double wall structure. 9. Structure portante en matière plastique suivant la revendication 8, caractérisée en ce que ladite structure portante en matière plastique est une palette, dans laquelle ladite première partie constitue le plateau supérieur (1), ladite seconde partie le plateau inférieur (2,3, 4), et en ce que lesdits éléments tubulaires forment les éléments de liaison entre le plateau supérieur (1) et le plateau inférieur (2,3, 4).9. Plastic supporting structure according to claim 8, characterized in that said plastic supporting structure is a pallet, in which said first part constitutes the upper plate (1), said second part constitutes the lower plate (2,3, 4), and in that said tubular elements form the connecting elements between the upper plate (1) and the lower plate (2,3, 4).
FR0301396A 2002-02-11 2003-02-06 PLASTIC CARRIER STRUCTURE AND METHOD FOR MANUFACTURING THE SAME Expired - Fee Related FR2836895B1 (en)

Applications Claiming Priority (2)

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BE2002/0084A BE1014633A6 (en) 2002-02-11 2002-02-11 Method of forming plastic pallet structure comprises inserting and adhering projections of one component into cavities of second component
BE2002/0126A BE1014662A5 (en) 2002-02-11 2002-02-25 Supporting structure PLASTIC AND METHOD FOR MANUFACTURING THEREOF.

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DE102009003611A1 (en) * 2009-03-12 2010-09-16 Paul Craemer Gmbh Pallet has upper side designated as deck, side walls which extend downward from upper side, and ribs stiffening deck, where pallet is made up of plastic
CH715550A1 (en) 2018-11-15 2020-05-15 Utz Georg Holding Ag Plastic pallet with protected runners.

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EP0690002A1 (en) * 1994-06-29 1996-01-03 Vincenzo Di Candido Pallet made of corrugated cardboard

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EP0452726A1 (en) * 1990-04-02 1991-10-23 Project Development Ltd. Z.A.G. Panel structures formed by extrusion
EP0690002A1 (en) * 1994-06-29 1996-01-03 Vincenzo Di Candido Pallet made of corrugated cardboard

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FR2836895B1 (en) 2006-02-03
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NL1022614C2 (en) 2003-08-13

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