EP3170637B1 - Method for producing a board-shaped element from which, for example, a pallet chock can be formed - Google Patents

Method for producing a board-shaped element from which, for example, a pallet chock can be formed Download PDF

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Publication number
EP3170637B1
EP3170637B1 EP16199850.5A EP16199850A EP3170637B1 EP 3170637 B1 EP3170637 B1 EP 3170637B1 EP 16199850 A EP16199850 A EP 16199850A EP 3170637 B1 EP3170637 B1 EP 3170637B1
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EP
European Patent Office
Prior art keywords
wood
board
formed element
shaped formed
mixture
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.)
Active
Application number
EP16199850.5A
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German (de)
English (en)
French (fr)
Other versions
EP3170637A3 (en
EP3170637A2 (en
Inventor
Leon IDE
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.)
Holding Ter Dos bvba
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Holding Ter Dos bvba
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Priority to PL16199850T priority Critical patent/PL3170637T3/pl
Publication of EP3170637A2 publication Critical patent/EP3170637A2/en
Publication of EP3170637A3 publication Critical patent/EP3170637A3/en
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Publication of EP3170637B1 publication Critical patent/EP3170637B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/02—Manufacture of substantially flat articles, e.g. boards, from particles or fibres from particles

Definitions

  • This invention relates to a method for producing a board-shaped element from a wood mixture wherein at least 95 % of the supplied wood mixture comprising wood slabs whereof the width lies between 1 and 4 cm, the length lies between 2 and 5 cm, and the thickness lies between 0.2 and 2 cm.
  • This disclosure relates to the production of a formed element from the formed board-shaped element.
  • the formed element is preferably an intermediate block for a pallet, a beam-formed element for the making of a two-way pallet, or a formed element which can be used to support, for example, packed goods.
  • Pallet intermediate blocks are component parts of a pallet. They can be made produced from a solid wooden beam which has been sawn to the appropriate dimension. Solid pallet chocks of this type are generally dearer than pressed chocks. Pressed chocks are produced from a mixture of wood chips and/or sawdust which are pressed into the appropriate shape.
  • the wood chips are generally derived from wood slabs, which are firstly reduced in size via, for example, a hammer mill or knife mill. These wood chips can possibly also be mixed with sawdust.
  • the wood slabs are residual products of timber mills or lumber mills, have an irregular shape, with a size (w x 1) of 1 - 4 cm by 2 - 5 cm, and a thickness of 0.2 - 2 cm. Depending on the season and the degree of drying out, the wood slabs have a moisture content which can range between 25 and 100 %.
  • the wood chips and/or sawdust are thermally dried, so that the particular mixture still has a moisture content of 2 - 3%.
  • the dried mixture is mixed with glue and pressed into chocks.
  • the pressing is realized with a forming press, an impact press, or with the aid of a (press) extruder. Heat should additionally be applied during the pressing in order thereby to make the glue set.
  • the described method has a number of drawbacks, however, namely: energy necessary to reduce wood slabs into wood chips, thermal energy necessary to dry the wood chips, and thermal energy necessary to set the glue.
  • EP 0 373 726 A2 relates to a cellulosic fibrous aggregate, in particular a light wood aggregate, formed form a cellulosic fibrous material by a process which comprises: a softening stage comprising exposing a section of cellulosic fibrous material to the action of an aqueous softening agent at a temperature in the range from 150 °C to 220 °C and a curing stage comprising drying the product of the softening stage at a temperature in the range from 100 °C to 220 °C to yield a cross-linked cellulosic matrix.
  • DE 197 56 154 C1 relates to a shaped body substantially consisting of A) wood particles and/or material containing cellulose (constituent A) and B) a porous PU agent (component B) in a weight ratio of 0.05-1.0: 1.0 (constituent B) to constituent A)).
  • the shaped body according to the invention can be produced by reacting at least one polyisocyanate with at least one polyol and/or polyamine and at least one carboxylic acid as an expanding agent, preferably at temperatures of 80-100 °C with an initial pressure of over 1 kp/cm 2 .
  • the object of this invention is now to provide a method for proceeding to produce a board-shaped formed product from a wood mixture comprising wood slabs, from which various end products, such as, for example, a pallet chock, can be formed, which method requires much less energy than the known method.
  • the object of the invention is achieved by providing a method for forming a board-shaped formed element from a wood mixture wherein at least 95 % of the supplied wood mixture consists of wood slabs whereof the width lies between 1 and 4 cm, the length lies between 2 and 5 cm, and the thickness lies between 0.2 and 2 cm, wherein the supplied wood mixture is mechanically pressed, so that a wood mixture having a moisture content lying between 30 and 45 % is obtained, after which the pressed-out wood mixture is mixed with a polyurethane glue as an adhesive and is form-pressed into a board-shaped formed element, and this without any prior heating of the wood mixture to be pressed, and thermal heat is used at no single moment during the production of the board-shaped formed element.
  • the supplied wood slabs have a natural moisture content which can range from 25% to 100%, this depending on the season, the air humidity in the environment of the storage site, etc.
  • a wood mixture having a uniform moisture content is obtained.
  • An advantage of the method according to the invention, which is defined in claim 1, is that only mechanical pressing, and not thermal heat, is used to achieve the intended moisture content (30 - 45 %), which is much more advantageous and more environmentally friendly.
  • the board form-pressing will preferably be realized with either a forming press (flat press), which operates discontinuously, or a continuous press, wherein the formed board comes endlessly out of the press. Where a continuous press is used, no thermal heat will be added, of course, during the board form-pressing.
  • the board-shaped formed element which is obtained via the method preferably has a thickness lying between 50 and 150 mm.
  • the obtained board-shaped formed element is further naturally dried at ambient temperature. In this way, some of the water which is present is removed and, depending on the environmental conditions, the moisture content of the formed element can be reduced to about 20 - 25%, in case of external application or use, and to about 10 - 20%, in case of internal application or use.
  • the supplied wood mixture is not further reduced in size with the aid of a crusher.
  • the supplied wood mixture either substantially consists of chips (of match size or smaller) and/or sawdust or wherein the supplied mixture is first reduced to sawdust and/or chips (of match size or smaller).
  • the wood slabs of the supplied wood mixture derive from the side of a tree in a sawmill and/or chopped small round wood and/or round logs and/or recycled wood.
  • the dimensions (w x 1 x d) of the wood slabs are approximately 1 - 4 cm x 2 - 5 cm x 0.2 - 2 cm. Smaller fractions which are present in the wood slabs can possibly be removed therefrom, for example, by screening.
  • the pressed-out wood mixture comprises 5 - 20 % by weight adhesive.
  • 5 - 15 % by weight glue is added.
  • the adhesive will ensure that the (damp) wood slabs adhere to one another.
  • the glue which is used will proceed to react with the pre-existing moisture in the wood slabs and will in this way bond everything together during the pressing.
  • the adopted glue is a PU glue, because a PU glue is ideal for bonding damp wood. PU glue namely has a certain quantity of moisture necessary to be able to react.
  • other suitable types of glues for bonding a damp wood mixture can also be considered.
  • the thus formed board-shaped formed element can be used as a wall or floor panel.
  • the dimensions are chosen according to the applications, but standardly lie (w x 1) between 500 - 1000 mm and 1500 - 2500 mm. Naturally, dimensions which differ herefrom are perfectly possible.
  • the board-shaped formed element is further cut up into a beam-shaped formed element having a length lying between 50 and 200 cm and a width lying between 30 and 120 mm.
  • a formed element of this type is preferably used in the production of a so-called two-way pallet.
  • the beam-shaped formed element is preferably provided with a, preferably slot-shaped, recess suitable for receiving a binding material.
  • a formed element of this type can perfectly well be used for placement under packages.
  • the board-shaped formed element is further cut up into a pallet chock having a length lying between 70 and 150 mm, a width lying between 30 and 150 mm, and a height lying between 60 and 120 mm.
  • Pallet chocks of this type are used in the production of so-called four-way pallets.
  • This invention relates to a method for forming a board-shaped formed element (1) from a wood mixture comprising wood slabs whereof the width lies between 1 and 4 cm, the length lies between 2 and 5 cm, and the thickness lies between 0.2 and 2 cm. At least 95 % of the supplied wood mixture herein consists of wood slabs whereof the dimensions lie within the said limits.
  • the slabs have a natural moisture (free water) content from 25 to 100 % and are derived from the chopping of round wood or from a sawmill (residual product) or from recycling wood. They are totally irregular in shape.
  • the slabs of the wood mixture are subjected to a mechanical pressing operation in order to press the (free) water out of them.
  • a mechanical pressing operation By the mechanical pressing of the supplied wood mixture, a wood mixture having a moisture content lying between 30 and 45 % is obtained.
  • the pressing will be realized with a known (mechanical) pressing device.
  • the slabs are mixed with a defined quantity of adhesive, which is a polyurethane glue (PU glue) and subsequently form-pressed into a board-shaped formed element (1).
  • PU glue polyurethane glue
  • PU glue polyurethane glue
  • 5 - 20 % by weight glue is used.
  • the form-pressing can be realized with the aid of a forming press or a continuous press.
  • a trough-shaped press comprising a hydraulic ram which is movable up and down. The press had the following dimensions: 400 mm x 160 mm x 300 mm (1 x w x h).
  • the pressed-out wood mixture which is mixed with the adhesive can be filled to 250 - 300 mm high so as subsequently to be pressed to about 80 mm high.
  • a bonded board, 400 mm long x 160 mm wide and 80 mm thick, is hereby obtained.
  • a pressure of between 30 and 40 bar was applied with the ram over a certain period. The applied pressure is dependent on the quantity (density) of the wood stock which needs to be compressed.
  • the wood mixture supplied to the forming press is already a mixture of wood slabs whereof the width lies between about 1 and 4 cm, the length lies between about 2 and 5 cm, and the thickness lies between about 0.2 and 2 cm, and which have already been pressed, via a known (mechanical) press, in order to reduce the fixed water content to about 35%.
  • the boards obtained in trial 1 and 2 were subsequently sawn into pallet chocks (according to standard dimensions) and stored for about 3 months in an environment shielded from precipitation, so as to be able to dry naturally. Following inspection, it turned out that the formed pallet chocks exhibit no deformations and react in much the same way as pallet chocks formed from solid wood.
  • Figure 1 shows a possible embodiment of a board-shaped formed element (1).
  • a formed element (1) of this type can be used as floor or wall panel.
  • various other products can be produced from the formed board-shaped formed element (1).
  • the board-shaped formed element (1) can be further cut up into a beam-like formed element (2) having a length lying between 50 and 200 cm, and a width lying between 30 and 120 mm.
  • a formed element of this type is preferably used in the production of a so-called two-way pallet (5) as depicted in Figure 2 .
  • the beam-like formed element (2) can be provided with a slot-shaped recess (3) suitable for receiving a binding material (8) (for example binding tape).
  • a binding material (8) for example binding tape.
  • a formed element of this type is depicted in Figure 3 and can perfectly well be used as a support (7) for placement under a packed material (9).
  • the board-shaped formed element (1) is further cut up into a pallet chock (4) having a length lying between 70 and 150 mm, a width lying between 30 and 150 mm, and a height lying between 60 and 120 mm.
  • Pallet chocks of this type are used in the production of so-called four-way pallets (6) (see Figure 4 ).

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
EP16199850.5A 2015-11-19 2016-11-21 Method for producing a board-shaped element from which, for example, a pallet chock can be formed Active EP3170637B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL16199850T PL3170637T3 (pl) 2015-11-19 2016-11-21 Sposób wytwarzania elementu w postaci płyty, z którego można na przykład wytworzyć klocek do palety

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BE2015/5755A BE1023637B1 (nl) 2015-11-19 2015-11-19 Werkwijze voor het vervaardigen van een plaatvormig element waaruit bijvoorbeeld een palletklos gevormd kan worden

Publications (3)

Publication Number Publication Date
EP3170637A2 EP3170637A2 (en) 2017-05-24
EP3170637A3 EP3170637A3 (en) 2017-08-23
EP3170637B1 true EP3170637B1 (en) 2019-01-02

Family

ID=55237456

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16199850.5A Active EP3170637B1 (en) 2015-11-19 2016-11-21 Method for producing a board-shaped element from which, for example, a pallet chock can be formed

Country Status (3)

Country Link
EP (1) EP3170637B1 (nl)
BE (1) BE1023637B1 (nl)
PL (1) PL3170637T3 (nl)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2962459A (en) * 1958-07-01 1960-11-29 Monsanto Chemicals Composition comprising phenolic resin and cellulosic material coated with petroleum hydrocarbon and process for preparing board therefrom
CA997263A (en) * 1973-05-02 1976-09-21 Champion International Corporation Fire retardant particleboard and process for its manufacture
ES2073429T3 (es) * 1988-12-16 1995-08-16 Shell Int Research Agregado fibroso celulosico y un procedimiento para su preparacion.
US5021122A (en) * 1990-01-22 1991-06-04 Domtar Inc. Exploded bark products
DE19756154C1 (de) * 1997-12-17 1999-10-28 Henkel Kgaa Formkörper aus Holzteilchen und PU-Bindemittel, ihre Herstellung und Verwendung
JP2002200608A (ja) * 2000-12-28 2002-07-16 Dantani Plywood Co Ltd 高強度パーティクルボード

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP3170637A3 (en) 2017-08-23
BE1023637B1 (nl) 2017-05-29
BE1023637A1 (nl) 2017-05-29
EP3170637A2 (en) 2017-05-24
PL3170637T3 (pl) 2019-06-28

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