EP1737739B1 - Method for manufacturing load-carrying elements - Google Patents
Method for manufacturing load-carrying elements Download PDFInfo
- Publication number
- EP1737739B1 EP1737739B1 EP05730931A EP05730931A EP1737739B1 EP 1737739 B1 EP1737739 B1 EP 1737739B1 EP 05730931 A EP05730931 A EP 05730931A EP 05730931 A EP05730931 A EP 05730931A EP 1737739 B1 EP1737739 B1 EP 1737739B1
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- EP
- European Patent Office
- Prior art keywords
- cores
- elements
- paperboard
- web
- weakening lines
- 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.)
- Not-in-force
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Classifications
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- 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
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- 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
- B65D19/0028—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 discrete foot-like shape
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- 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
- B65D2519/00019—Paper
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- 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
- B65D2519/00054—Paper
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- 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
- B65D2519/00089—Paper
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- 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
- B65D2519/00124—Paper
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- 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
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- 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
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- 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
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- 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
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- 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
- B65D2519/00338—Overall construction of the base surface shape of the contact surface of the base contact surface having a discrete foot-like shape
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- 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
- B65D2519/00432—Non-integral, e.g. inserts
- B65D2519/00447—Non-integral, e.g. inserts on the non-integral separating spacer
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- 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
- B65D2519/00562—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 chemical connection, e.g. glued, welded, sealed
Definitions
- the invention relates to a method for manufacturing load-carrying elements, in which tubular paperboard cores are disposed in a row and are assembled by means of a covering paperboard to form a beam aligned with the row of cores.
- the invention also relates to the manufacture of a loading base such as a pallet comprising the supporting elements thus obtained.
- Paperboard cores manufactured by gluing helically wound board layers on top of each other to form a tube with a multi-layered mantle have been conventionally used as cores in paper rolls, on which the load is exerted laterally.
- Pallets utilising the high axial compression strength of the cores form a second object of application of paperboard cores.
- the cores and the covering paperboard are assembled into beams, which are aligned and joined by means of a covering plate to form a pallet, in which the core axes included in the beams are perpendicular to the plane of the pallet.
- the pallet may also comprise beams crosswise in two layers, and then no covering plate will be necessary in order to assemble the pallet.
- Such prior art disposable pallets made of recyclable material have been disclosed by FI patent specifications 93933 and 107600 B , among other publications.
- the beams for the pallet are manufactured by aligning the cores on a sheet of corrugated board, which is wrapped around the cores and bound to these by means of hotmelt glue.
- the sheet and the core row have equal lengths so that the beam thus formed will have open ends.
- FI patent specification 107600 B comprises a sheet of corrugated board shaped and dimensioned so as to surround the row of cores and also close the ends of the beam thus obtained.
- the purpose of the invention is thus to improve the process for manufacturing beams formed of paperboard cores and covering paperboard, comprising the cutting of a previously assembled beam into sections of specific lengths.
- the invention has the specific purpose of providing a solution by means of which a beam can be cut with less effort than before while producing a neat cutting mark.
- the method of the invention is characterised by the fact that, before the beam is assembled, the covering board is equipped with one or more weakening lines transverse to the direction of the row of cores and in that each element formed of paperboard and cores is separated by cutting the beam along the weakening line.
- the covering paperboard may have been weakened in advance to an extent such that no cutting tool is needed for detaching the element to be separated, i.e. the beam of a specific length forming the end product of the method, the beam being removed by a simple impact.
- the invention does not require the cutting location to be between the cores with the same absolute precision as does cutting of the beam by means of a linear cutter movement or by sawing, and hence the cores may be located closer to each other at the cutting location and even in contact with each other without preventing cutting of the beam.
- the weakening lines required by the invention are preferably perforations of the covering paperboard.
- the weakening line may consist of dot-like or preferably linear perforations penetrating through the paperboard and covering the weakening line so that the portions on the two sides of the line are weakly joined only by narrow bridges between the perforations.
- the bridges are required to have only a strength such that the paperboard can be wrapped around the cores without breaking prematurely. Previously made long linear perforations and a minimum number of bridges also achieve the most even cutting mark. Light slitting of the board surface at the bridge locations also contributes to this.
- a weakening line can be produced in a paperboard sheet or web e.g. by means of a reciprocating tool of saw blade type, which produces linear perforations in the paperboard that separate the bridges from each other. Assuming that a light impact is enough for final cutting of the beam, cutting the beam by means of said tool in accordance with the invention is a substantially easier and more secure operation than dividing an intact beam as in the prior art operation.
- Perforations or any similar weakening lines can be produced in the paperboard sheet or web while it is in a single plane, i.e. before starting to bend the web around the cores. It is also preferable to produce the weakening lines in the sheet or web before placing the cores on this. This allows the cores to be disposed in mutual contact also at the location of the weakening line.
- the invention is particularly suitable for continuous manufacture of elements, i.e. beams of a specific length, which is performed by forming transverse weakening lines in a continuous paperboard web at intervals equalling the lengths of the elements, aligning cores on the web, wrapping the web around the row of cores to form a beam and dividing the beam along the weakening lines to form separate elements.
- the invention can optionally be implemented by producing a beam of a specific length comprising one or more transverse weakening lines, the beam being divided into parts by supporting the beam between the weakening lines and directing a blow or an impact simultaneously to both ends of the beam for detaching the part to be separated.
- the method of the invention for producing a loading base comprises the manufacture as described above of elements consisting of paperboard cores and covering paperboard, i.e. beams of specific lengths, which are disposed next to each other and bound to each other to form a base, with the base receiving the load exerted on it in the axial direction of the cores.
- the beams can be connected to form a pallet by means of a covering plate, on which the load carried by the pallet is placed. Beams are preferably aligned on the pallet in succession and separated from each other, allowing a lifting fork to grip the rectangular pallet from all four sides of the pallet by penetrating between the beams.
- the production line of figure 1 produces in a continuously operating process a beam 3 consisting of tubular paperboard cores 1 and surrounding covering paperboard 2, the beam being divided at the end of the process into parts of specific lengths, i.e. beam-like elements 4 of specific lengths, which, owing to their strength, are suitable for carrying load in loading bases, such as pallets, for instance.
- Disposable pallets made entirely of paperboard have the advantage of their material being recyclable.
- the beam 3 is formed of a continuous paperboard web 2 provided with longitudinal crease lines 5 and board core pieces 1 aligned on this.
- the crease lines 5 divide the web 2 into a central strip 6, inner border strips 7 on both sides of this and outer border strips 8 at the edges of the web.
- weakening lines 9 are produced at given intervals, extending from one edge of the other in the web.
- the weakening lines 9 may consist of perforations and narrow bridges between these, which retain the web assembled at the lines.
- the web 2 is spread in one single plane, the perforations being made by means of a reciprocating tool 10 of saw-blade type perpendicularly to the plane of the web.
- the distance between the weakening lines 9 has been dimensioned so as to equal the summed diameters of two adjacent cores 1 in one row of cores.
- the cores 1 are disposed in the central strip 6 of the web 2, with the weakening lines 9 intersecting the row of cores at the location 11 between every second core.
- the weakening line 9 passes through the point at which adjacent cores 1 touch each other, even though the invention does not necessarily require such exact positioning of the cores 1 relative to the weakening line 9.
- the contact between the cores 1 is not indispensable, but instead, it is possible to leave gaps between the individual cores or the pairs of cores between the weakening lines 9.
- the cores are disposed on the web 2 by means of the vertically reciprocating tool 13 gripping the cores with its fork 12 as illustrated in figure 1 .
- the cores 1 can be brought onto the web 2 in many different ways, as e.g. by pushing the cores from the side of the web or by continuously leading the cores along groove-like guides from the side or the top of the web. Such embodiments are known per se or obvious to those skilled in the art.
- the web 2 is bent around the row of cores by means of guides (not illustrated).
- the aligned border strips 8 form a longitudinal seam line 14 on the upper side of the beam.
- glue is applied to the web 2 and/or the cores 1 before the web is bent.
- the continuous beam 3 provided with transverse weakening lines 9 obtained in the last process step is divided into parts by cutting the beam along each weakening line. This results in beam-like elements 4 of specific lengths, each of which has two adjacent paperboard cores 1 surrounded by the covering paperboard 2.
- the cutting tool consists of a hydraulically reciprocating hammer 15, which separates an element 4 by a light impact on this.
- Figure 2 shows belt conveyors 16 moving a finished beam 3 and having the additional function of supporting the beam so that the element 4 to be separated from its end each time is separated without efforts.
- the production of the beam 3 can differ from the procedure described above by forming the weakening lines 9 before the web 2 is provided with longitudinally scored crease lines 5.
- the paperboard web 5 is preferably formed of a plurality of material webs on top of each other, and then the weakening lines 9 can be formed separately in each of these before the webs are joined together, so that their weakening lines coincide.
- the material webs are bound together by means of glue, and the crease lines 5 are preferably scored to the layered structure of the web 2 before the glue dries, i.e. while the web is moistened or softened by fresh glue.
- a covering paperboard 2 glued in multiple layers imparts the beam 3 rigidity, which facilitates the division of the beam into elements 4 and produces stronger elements for various loading applications.
- the object of cutting is a beam 3 produced with specific dimensions and provided with weakening lines 9 enabling division.
- the weakening lines 9 divide the beam 3 into three parts, each of which comprises two adjacent core pieces 1 surrounded by the covering paperboard 2.
- the beam 3 has been disposed on a base 17, and cutting is performed by means of drive belts 19 rotating around the outermost parts of the beam and driven by hydraulic cylinders 18.
- the beam 3 is divided as shown in figure 4 along weakening lines 9 into three elements 4 corresponding to figures 1 and 2 .
- FIG. 5 illustrates a variation of the invention, in which the perforation tool cuts weakening lines 9 in the paperboard web 2, the lines matching the core pieces 1 defined by the lines and being spaced by areas 20, which are split off as the obtained continuous beam is divided into individual elements 4 as shown in figure 6 .
- each element 4 comprises three adjacent cores 1, and the ends of the elements have been rounded so as to match the circular profile of the cores by the shape of the weakening lines 9.
- Figure 7 shows a paperboard pallet 21, which has been formed by disposing a total of nine beam-like elements 4 obtained as in figure 1 next to each other in three longitudinal and transverse rows and by binding them together with a covering plate 22, the axes of the cores 1 included in the elements being perpendicular to the plane of the plate.
- the covering plate 22 receives the load placed on the pallet, and the gaps 23 between the aligned elements 4 allow the loaded pallet to be shifted by means of the lifting fork of a forklift truck.
- the application of the pallet 21 shown in figures 8-10 differs from the one of figure 7 in that, below the longitudinal rows of beam-like elements 4, base strips 24 have been disposed extending from one end to another of the rows, the base strips consisting of elongated paperboard strips having roughly the same width as that of the elements 4.
- the longitudinal edges 25 of the strips 24 have been bent upwardly so that the strip forms a shallow groove, into which each element 4 is fitted.
- the groove has been filled with filling paperboard 26 between the elements 4, cf. figure 10 .
- the strips 24 and the pieces of paperboard filling 26 may consist of glued multi-layered paperboard as described above, corresponding to the one used for coating 2 the beam-like elements 4.
- the longitudinal base strips 24 have the double purpose of strengthening the pallet and above all of allowing it to be shifted on a roller conveyor in the longitudinal direction of the strips.
- the pallet can be lifted and shifted by means of a forklift truck owing to the gaps 23 between the rows of elements and the openings 27 between the elements 4 provided between the covering plate 22 of the pallet and the base strips 24.
- the covering paperboard of the beams may consist of two separate webs or sheets, one of which surrounds the cores 1 on their bottom side and the other one surrounds them on their top side, so that the webs or sheets form together the longitudinal sides of the elements.
- the cores are not necessarily surrounded by covering paperboard on all the longitudinal sides, but the beam and accordingly the elements separated from this can be left partly open, provided that the gluing is adequate for assembling the elements.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Pallets (AREA)
- Making Paper Articles (AREA)
- Catalysts (AREA)
- Support Of The Bearing (AREA)
- Forging (AREA)
- Magnetic Bearings And Hydrostatic Bearings (AREA)
Abstract
Description
- The invention relates to a method for manufacturing load-carrying elements, in which tubular paperboard cores are disposed in a row and are assembled by means of a covering paperboard to form a beam aligned with the row of cores. The invention also relates to the manufacture of a loading base such as a pallet comprising the supporting elements thus obtained.
- Paperboard cores manufactured by gluing helically wound board layers on top of each other to form a tube with a multi-layered mantle have been conventionally used as cores in paper rolls, on which the load is exerted laterally. Pallets utilising the high axial compression strength of the cores form a second object of application of paperboard cores. The cores and the covering paperboard are assembled into beams, which are aligned and joined by means of a covering plate to form a pallet, in which the core axes included in the beams are perpendicular to the plane of the pallet. The pallet may also comprise beams crosswise in two layers, and then no covering plate will be necessary in order to assemble the pallet. Such prior art disposable pallets made of recyclable material have been disclosed by
FI patent specifications 93933 107600 B - In
FI patent specification 93933 FI patent specification 107600 B - It is also previously known in the manufacture of pallets to produce beams consisting of cores and covering paperboard in serial production, by disposing the cores on a continuous moving board web, which is wrapped around the cores and glued to them, forming a continuous beam which is eventually divided into sections of the desired lengths by means of a cutter of by sawing.
- However, the cutting of a prior art beam that is previously assembled and glued involves a number of drawbacks. If adjacent cores bear on each other in the beam, a cutter performing a reciprocating linear movement has problems in hitting exactly between the cores with a precision such that the beam can be cut. The same applies to rectilinear sawing of the beam, which should be carried out without damaging cores in the vicinity of the cutting point. In the practice, cutting of the beam requires a gap to be left between the cores located on both sides of the cutting point. On the other hand, cutting the beam by means of a tool sawing or slitting the covering board and rotating around the beam at the cutting location is a more laborious operation. The cutting mark produced by the saw is often rough, and it is difficult to combine the two cutting manners, i.e. a linearly proceeding movement and a movement rotating around the beam, in a manufacturing process based on a continuous movement of the beam.
- The purpose of the invention is thus to improve the process for manufacturing beams formed of paperboard cores and covering paperboard, comprising the cutting of a previously assembled beam into sections of specific lengths. The invention has the specific purpose of providing a solution by means of which a beam can be cut with less effort than before while producing a neat cutting mark. The method of the invention is characterised by the fact that, before the beam is assembled, the covering board is equipped with one or more weakening lines transverse to the direction of the row of cores and in that each element formed of paperboard and cores is separated by cutting the beam along the weakening line.
- In accordance with the invention, the covering paperboard may have been weakened in advance to an extent such that no cutting tool is needed for detaching the element to be separated, i.e. the beam of a specific length forming the end product of the method, the beam being removed by a simple impact. The invention does not require the cutting location to be between the cores with the same absolute precision as does cutting of the beam by means of a linear cutter movement or by sawing, and hence the cores may be located closer to each other at the cutting location and even in contact with each other without preventing cutting of the beam.
- The weakening lines required by the invention are preferably perforations of the covering paperboard. The weakening line may consist of dot-like or preferably linear perforations penetrating through the paperboard and covering the weakening line so that the portions on the two sides of the line are weakly joined only by narrow bridges between the perforations. The bridges are required to have only a strength such that the paperboard can be wrapped around the cores without breaking prematurely. Previously made long linear perforations and a minimum number of bridges also achieve the most even cutting mark. Light slitting of the board surface at the bridge locations also contributes to this.
- A weakening line can be produced in a paperboard sheet or web e.g. by means of a reciprocating tool of saw blade type, which produces linear perforations in the paperboard that separate the bridges from each other. Assuming that a light impact is enough for final cutting of the beam, cutting the beam by means of said tool in accordance with the invention is a substantially easier and more secure operation than dividing an intact beam as in the prior art operation. Perforations or any similar weakening lines can be produced in the paperboard sheet or web while it is in a single plane, i.e. before starting to bend the web around the cores. It is also preferable to produce the weakening lines in the sheet or web before placing the cores on this. This allows the cores to be disposed in mutual contact also at the location of the weakening line.
- The invention is particularly suitable for continuous manufacture of elements, i.e. beams of a specific length, which is performed by forming transverse weakening lines in a continuous paperboard web at intervals equalling the lengths of the elements, aligning cores on the web, wrapping the web around the row of cores to form a beam and dividing the beam along the weakening lines to form separate elements. The invention can optionally be implemented by producing a beam of a specific length comprising one or more transverse weakening lines, the beam being divided into parts by supporting the beam between the weakening lines and directing a blow or an impact simultaneously to both ends of the beam for detaching the part to be separated.
- The method of the invention for producing a loading base, such as a pallet, comprises the manufacture as described above of elements consisting of paperboard cores and covering paperboard, i.e. beams of specific lengths, which are disposed next to each other and bound to each other to form a base, with the base receiving the load exerted on it in the axial direction of the cores. The beams can be connected to form a pallet by means of a covering plate, on which the load carried by the pallet is placed. Beams are preferably aligned on the pallet in succession and separated from each other, allowing a lifting fork to grip the rectangular pallet from all four sides of the pallet by penetrating between the beams.
- The invention will be explained in further detail below by means of examples and with reference to the accompanying drawings, in which
- figure 1
- is a schematic view of a continuous line for producing a continuous beam and for dividing it to beam-like elements of specific lengths,
- figure 2
- shows a part of the production line with a conveyor conveying the continuous beam thus produced,
- figures 3 and 4
- show the division into parts of a beam of a specific length and provided with weakening lines,
- figure 5
- shows parts of a production line, on which cores are disposed on a continuous covering paperboard web to be provided with weakening lines in one embodiment of the invention,
- figure 6
- shows an individual beam-like element to be produced on the production line of
figure 5 , - figure 7
- shows a pallet assembled from beam-like elements and a covering plate produced as in
figure 1 , - figure 8
- shows a second pallet comprising beam-like elements produced In accordance with the invention,
- figure 9
- is a section IX-IX of
figure 8 , and - figure 10
- is a section X-X of
figure 8 . - The production line of
figure 1 produces in a continuously operating process abeam 3 consisting oftubular paperboard cores 1 and surrounding coveringpaperboard 2, the beam being divided at the end of the process into parts of specific lengths, i.e. beam-like elements 4 of specific lengths, which, owing to their strength, are suitable for carrying load in loading bases, such as pallets, for instance. Disposable pallets made entirely of paperboard have the advantage of their material being recyclable. - In a closer study of the process of
figure 1 , thebeam 3 is formed of acontinuous paperboard web 2 provided withlongitudinal crease lines 5 andboard core pieces 1 aligned on this. Thecrease lines 5 divide theweb 2 into acentral strip 6, inner border strips 7 on both sides of this andouter border strips 8 at the edges of the web. Before thecores 1 are brought onto theweb 2, weakeninglines 9 are produced at given intervals, extending from one edge of the other in the web. The weakeninglines 9 may consist of perforations and narrow bridges between these, which retain the web assembled at the lines. At the moment of perforation, theweb 2 is spread in one single plane, the perforations being made by means of areciprocating tool 10 of saw-blade type perpendicularly to the plane of the web. - In the embodiment of the invention illustrated in
figure 1 , the distance between the weakeninglines 9 has been dimensioned so as to equal the summed diameters of twoadjacent cores 1 in one row of cores. Thecores 1 are disposed in thecentral strip 6 of theweb 2, with theweakening lines 9 intersecting the row of cores at thelocation 11 between every second core. In the ideal case, the weakeningline 9 passes through the point at whichadjacent cores 1 touch each other, even though the invention does not necessarily require such exact positioning of thecores 1 relative to theweakening line 9. The contact between thecores 1 is not indispensable, but instead, it is possible to leave gaps between the individual cores or the pairs of cores between the weakening lines 9. - The cores are disposed on the
web 2 by means of the vertically reciprocatingtool 13 gripping the cores with itsfork 12 as illustrated infigure 1 . However, thecores 1 can be brought onto theweb 2 in many different ways, as e.g. by pushing the cores from the side of the web or by continuously leading the cores along groove-like guides from the side or the top of the web. Such embodiments are known per se or obvious to those skilled in the art. - After the
cores 1 have been disposed on the web, theweb 2 is bent around the row of cores by means of guides (not illustrated). This results in abeam 3 with a rectangular cross-section, in which thecrease lines 5 of the web form the edges of the beam, thecentral strip 6 of the web forms the bottom of the beam, the inner border strips 7 form the vertical sides of the beam and theouter border strips 8 form together the upper side of the beam. The alignedborder strips 8 form alongitudinal seam line 14 on the upper side of the beam. To bind thebeam 3, glue is applied to theweb 2 and/or thecores 1 before the web is bent. - The
continuous beam 3 provided withtransverse weakening lines 9 obtained in the last process step is divided into parts by cutting the beam along each weakening line. This results in beam-like elements 4 of specific lengths, each of which has twoadjacent paperboard cores 1 surrounded by the coveringpaperboard 2. The cutting tool consists of ahydraulically reciprocating hammer 15, which separates anelement 4 by a light impact on this.Figure 2 showsbelt conveyors 16 moving afinished beam 3 and having the additional function of supporting the beam so that theelement 4 to be separated from its end each time is separated without efforts. - The production of the
beam 3 can differ from the procedure described above by forming theweakening lines 9 before theweb 2 is provided with longitudinally scoredcrease lines 5. Thepaperboard web 5 is preferably formed of a plurality of material webs on top of each other, and then theweakening lines 9 can be formed separately in each of these before the webs are joined together, so that their weakening lines coincide. The material webs are bound together by means of glue, and thecrease lines 5 are preferably scored to the layered structure of theweb 2 before the glue dries, i.e. while the web is moistened or softened by fresh glue. - A covering
paperboard 2 glued in multiple layers imparts thebeam 3 rigidity, which facilitates the division of the beam intoelements 4 and produces stronger elements for various loading applications. - In
figure 3 , unlike the description above, the object of cutting is abeam 3 produced with specific dimensions and provided withweakening lines 9 enabling division. Theweakening lines 9 divide thebeam 3 into three parts, each of which comprises twoadjacent core pieces 1 surrounded by the coveringpaperboard 2. With a view to cutting, thebeam 3 has been disposed on abase 17, and cutting is performed by means ofdrive belts 19 rotating around the outermost parts of the beam and driven byhydraulic cylinders 18. By a pull at thebelts 19, thebeam 3 is divided as shown infigure 4 alongweakening lines 9 into threeelements 4 corresponding tofigures 1 and2 . -
Figure 5 illustrates a variation of the invention, in which the perforation toolcuts weakening lines 9 in thepaperboard web 2, the lines matching thecore pieces 1 defined by the lines and being spaced byareas 20, which are split off as the obtained continuous beam is divided intoindividual elements 4 as shown infigure 6 . In this embodiment, eachelement 4 comprises threeadjacent cores 1, and the ends of the elements have been rounded so as to match the circular profile of the cores by the shape of the weakening lines 9. -
Figure 7 shows apaperboard pallet 21, which has been formed by disposing a total of nine beam-like elements 4 obtained as infigure 1 next to each other in three longitudinal and transverse rows and by binding them together with a coveringplate 22, the axes of thecores 1 included in the elements being perpendicular to the plane of the plate. The coveringplate 22 receives the load placed on the pallet, and thegaps 23 between thealigned elements 4 allow the loaded pallet to be shifted by means of the lifting fork of a forklift truck. - The application of the
pallet 21 shown infigures 8-10 differs from the one offigure 7 in that, below the longitudinal rows of beam-like elements 4, base strips 24 have been disposed extending from one end to another of the rows, the base strips consisting of elongated paperboard strips having roughly the same width as that of theelements 4. The longitudinal edges 25 of thestrips 24 have been bent upwardly so that the strip forms a shallow groove, into which eachelement 4 is fitted. The groove has been filled with fillingpaperboard 26 between theelements 4, cf.figure 10 . Thestrips 24 and the pieces of paperboard filling 26 may consist of glued multi-layered paperboard as described above, corresponding to the one used for coating 2 the beam-like elements 4. The longitudinal base strips 24 have the double purpose of strengthening the pallet and above all of allowing it to be shifted on a roller conveyor in the longitudinal direction of the strips. The pallet can be lifted and shifted by means of a forklift truck owing to thegaps 23 between the rows of elements and the openings 27 between theelements 4 provided between the coveringplate 22 of the pallet and the base strips 24. - It is obvious to those skilled in the art that the applications of the invention are not restricted to the example given above, but may vary within the scope of the accompanying claims. Thus, for instance, instead of one single continuous web or sheet, the covering paperboard of the beams may consist of two separate webs or sheets, one of which surrounds the
cores 1 on their bottom side and the other one surrounds them on their top side, so that the webs or sheets form together the longitudinal sides of the elements. The cores are not necessarily surrounded by covering paperboard on all the longitudinal sides, but the beam and accordingly the elements separated from this can be left partly open, provided that the gluing is adequate for assembling the elements.
Claims (13)
- A method for manufacturing load-carrying elements (4), in which tubular paperboard cores (1) are aligned and assembled by means of a covering paperboard (2) to form a beam (3) aligned with the row of cores, characterised in that before the beam (3) is assembled, the paperboard (2) is provided with one or more weakening lines (9) transverse to the direction of the row of cores and in that each element (4) formed of paperboard and cores is separated by dividing the beam along the weakening line, by means of a sudden impact or blow at the element to be separated from the beam.
- A method as defined in claim 1, characterised in that the weakening lines comprise perforations (9) made in the paperboard (2).
- A method as defined in claim 1 or 2, characterised in that a weakening line (9) extends from one edge to another of a paperboard sheet or web (2) used for the beam (3).
- A method as defined in any of the preceding claims, characterised in that a weakening line (9) intersects a row of cores between adjacent cores (1).
- A method as defined in any of the preceding claims, characterised in that the cores (1) in a row are in mutual contact.
- A method as defined in any of the preceding claims, characterised in that the weakening lines (9) are made in the paperboard sheet or web (2) while it is in one single plane.
- A method as defined in any of the preceding claims, characterised in that the weakening lines (9) are made in the paperboard sheet or web (2) before this and the cores (1) are joined.
- A method as defined in any of the preceding claims, characterised in that the row of cores is disposed on the paperboard sheet or web (2), which is wrapped around the cores (1) so as to form the longitudinal sides of the beam (3).
- A method as defined in any of the preceding claims, characterised in that elements (4) are manufactured continuously by forming transverse weakening lines (9) in a paperboard web (2) at intervals equalling the lengths of the elements, by disposing cores (1) on the web, by wrapping the web around the row of cores in order to form a beam (3) and by dividing the beam along the weakening lines into separate elements.
- A method as defined in any of claims 1-8, characterised in that a beam (3) is manufactured, which has a specific length and comprises two or more transverse weakening lines (9), the beam being divided into elements (4) by supporting the beam between the weakening lines and by directing an impact or blow simultaneously to both ends of the beam for separating the element.
- A method for manufacturing a loading base, characterised in that elements (4) are manufactured from paperboard cores (1) and covering paperboard (2) with the method defined in any of the preceding claims, the elements being disposed next to each other and bound together to form a base (21), with the base receiving load exerted on this in the axial direction of the cores.
- A method as defined in claim 11, characterised in that elements (4) are aligned in succession on the base (21) so as to allow a lifting fork shifting the base to be pushed into the gaps (23) between the elements.
- A method as defined in claim 11 or 12, characterised in that a pallet (21) is formed of adjacent supporting elements (4) and a covering plate (22) connecting these.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI20040503A FI117595B (en) | 2004-04-06 | 2004-04-06 | A method for manufacturing load-bearing elements |
PCT/FI2005/000176 WO2005097607A1 (en) | 2004-04-06 | 2005-04-06 | Method for manufacturing load-carrying elements |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1737739A1 EP1737739A1 (en) | 2007-01-03 |
EP1737739B1 true EP1737739B1 (en) | 2009-09-02 |
Family
ID=32104158
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05730931A Not-in-force EP1737739B1 (en) | 2004-04-06 | 2005-04-06 | Method for manufacturing load-carrying elements |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP1737739B1 (en) |
CN (1) | CN100528698C (en) |
AT (1) | ATE441592T1 (en) |
DE (1) | DE602005016386D1 (en) |
FI (1) | FI117595B (en) |
WO (1) | WO2005097607A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3225563A3 (en) * | 2016-03-28 | 2017-12-06 | Hans-Peter Stange | Object made of cardboard and method of manufacturing |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ES1062739Y (en) * | 2006-04-17 | 2006-10-16 | Finnco Gestion Y Servicios S A | CARTON SKATE FOR PALLET |
FR2905676B1 (en) * | 2006-09-11 | 2011-02-25 | Papeteries Et Cartonneries Lacaux Freres Sa | PLOT FOR RECYCLABLE PALLET, DEVICE FOR MANUFACTURING THE SAME AND ASSOCIATED INSTALLATION DEVICE |
ATE503693T1 (en) * | 2008-12-15 | 2011-04-15 | Rheingold Ag | PALLET WITH ROUND TUBE REINFORCED FEET |
ITBL20090016A1 (en) * | 2009-05-26 | 2010-11-27 | Costa Bruno | CORRUGATED CARDBOARD FOOT FOR PALETTE |
MY161969A (en) * | 2010-03-05 | 2017-05-31 | Agrofleet Sdn Bhd | Paper pallet |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE356944B (en) * | 1971-08-17 | 1973-06-12 | Akerlund & Rausing Ab | |
FI93933C (en) * | 1992-07-16 | 1995-06-26 | Wisapak Oy Ab | Pallet |
FI94852C (en) * | 1994-01-26 | 1995-11-10 | Wisapak Oy Ab | Cargo pallet and its manufacturing process |
US5406892A (en) * | 1994-03-15 | 1995-04-18 | Jefferson Smurfit Corporation | Paperboard pallet with half stringers |
FI107904B (en) * | 1994-09-08 | 2001-10-31 | Wisapak Oy Ab | Pallet |
FI107600B (en) * | 2000-02-03 | 2001-09-14 | Suomen Kuitulava Oy | Pallet and its manufacturing method |
CN2450112Y (en) * | 2000-10-20 | 2001-09-26 | 童红飞 | Paper pallet |
NZ513228A (en) * | 2001-07-31 | 2002-07-26 | Suomen Kuitulava Oy | Pallet made from cardboard with beams made from cardboard tubes |
-
2004
- 2004-04-06 FI FI20040503A patent/FI117595B/en not_active IP Right Cessation
-
2005
- 2005-04-06 CN CNB2005800108956A patent/CN100528698C/en not_active Expired - Fee Related
- 2005-04-06 EP EP05730931A patent/EP1737739B1/en not_active Not-in-force
- 2005-04-06 WO PCT/FI2005/000176 patent/WO2005097607A1/en active Application Filing
- 2005-04-06 DE DE602005016386T patent/DE602005016386D1/en not_active Expired - Fee Related
- 2005-04-06 AT AT05730931T patent/ATE441592T1/en not_active IP Right Cessation
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3225563A3 (en) * | 2016-03-28 | 2017-12-06 | Hans-Peter Stange | Object made of cardboard and method of manufacturing |
Also Published As
Publication number | Publication date |
---|---|
DE602005016386D1 (en) | 2009-10-15 |
CN1984818A (en) | 2007-06-20 |
WO2005097607A1 (en) | 2005-10-20 |
FI20040503A0 (en) | 2004-04-06 |
EP1737739A1 (en) | 2007-01-03 |
FI117595B (en) | 2006-12-15 |
ATE441592T1 (en) | 2009-09-15 |
CN100528698C (en) | 2009-08-19 |
FI20040503A (en) | 2005-10-07 |
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