EP3354430B1 - Verfahren zur herstellung eines osb-plattenwerkstoffs - Google Patents

Verfahren zur herstellung eines osb-plattenwerkstoffs Download PDF

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Publication number
EP3354430B1
EP3354430B1 EP17153994.3A EP17153994A EP3354430B1 EP 3354430 B1 EP3354430 B1 EP 3354430B1 EP 17153994 A EP17153994 A EP 17153994A EP 3354430 B1 EP3354430 B1 EP 3354430B1
Authority
EP
European Patent Office
Prior art keywords
strands
bleaching
osb
bleached
cover layer
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
EP17153994.3A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3354430A1 (de
Inventor
Norbert Kalwa
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.)
Swiss Krono Tec AG
Original Assignee
Swiss Krono Tec AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Swiss Krono Tec AG filed Critical Swiss Krono Tec AG
Priority to PT171539943T priority Critical patent/PT3354430T/pt
Priority to EP17153994.3A priority patent/EP3354430B1/de
Priority to HUE17153994A priority patent/HUE046683T2/hu
Priority to PL17153994T priority patent/PL3354430T3/pl
Priority to ES17153994T priority patent/ES2747550T3/es
Publication of EP3354430A1 publication Critical patent/EP3354430A1/de
Application granted granted Critical
Publication of EP3354430B1 publication Critical patent/EP3354430B1/de
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Classifications

    • 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
    • B27N1/00—Pretreatment of moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K5/00—Treating of wood not provided for in groups B27K1/00, B27K3/00
    • B27K5/02—Staining or dyeing wood; Bleaching wood
    • 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
    • B27N3/007—Manufacture of substantially flat articles, e.g. boards, from particles or fibres and at least partly composed of recycled material
    • 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
    • B27N3/08—Moulding or pressing
    • B27N3/10—Moulding of mats
    • B27N3/14—Distributing or orienting the particles or fibres
    • B27N3/143—Orienting the particles or fibres
    • 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
    • B27N3/08—Moulding or pressing
    • B27N3/18—Auxiliary operations, e.g. preheating, humidifying, cutting-off

Definitions

  • the invention relates to a method for producing an OSB panel material according to the preamble of claim 1.
  • OSB board materials or so-called chipboard are glued together and pressed wood chips.
  • so-called strands are used. These are glued in the known method after their preparation and sprinkled to a grit mat. The scattering of the strands takes place in a predetermined direction. Subsequently, the stratified and present in the grit mat beach are pressed together in a press to a plate material.
  • the beaches made of conifers have a different color image. This is based, on the one hand, on the color differences between the core and sapwood, and, on the other hand, also on discolorations which are caused by a fungus attack that is frequently present or by improper storage of the raw wood or of the beach.
  • To unify the color image of the surface of the wood materials produced from the strands are for example from EP 2 191949 A2 .
  • WO 2008/129048 A1 EP 2062708 A2 and DE 10 2004 050 278 A1
  • various methods are known in which fibers or chips made from the strands are bleached to obtain brighter surfaces. Visually particularly serious are discolorations caused by fungal attack, such as blue mold.
  • An essential aesthetic problem here is that due to the discoloration of the beach also the OSB board materials produced from it have no uniform color surface, but because of the red, gray or black colorings of a large number of the beaches give the impression that for the OSB boards inferior wood was used.
  • the invention is therefore based on the object to propose a method for producing an OSB panel material, which allows the production of an aesthetically pleasing surface. Furthermore, the invention has for its object to provide a corresponding OSB panel material.
  • the inventive method allows the production of optically high-quality and aesthetically pleasing-looking surfaces in the OSB board materials.
  • the bleaching of the beaches causes dark strands (eg reddish, gray and / or black strands) to become light, and even light strands experience only a slight change in their hue, resulting in an overall color adaptation of the strands used.
  • dark strands eg reddish, gray and / or black strands
  • the impression is avoided that poor quality wood grades are used in the production of the OSB strands.
  • the abbreviation OSB stands for "oriented strand board” and describes materials made from coarse chips, which - in contrast to common chips for chipboard - are suitable for being aligned in the material.
  • the invention relates to coarse particle boards with aligned large chips (strands).
  • Strands are in particular between 100-250 mm long, 10-75 mm wide and 0.6-2 mm thick and are preferably arranged by the throwing method.
  • the strands can with their longitudinal axis in the longitudinal axis direction of the OSB board material or transverse to the longitudinal axis direction of the OSB board material be aligned.
  • Under a plate material is a plate-shaped, flat material to understand.
  • An OSB panel material is understood to mean a corresponding OSB defined in DIN EN 300: 2006-09.
  • the OSB panel material is also referred to below as plate, panel material or OSB.
  • the production of the strands is carried out by customary methods, for example by debarking after the provision of the suitable round wood, cutting into strands and, if appropriate, then drying them, for example by drying them.
  • the further gluing of the strands, scattering of the strands into a spreading material mat, the pressing of the strands to the spreading material mat from scattered strands, for example, under the action of heat and pressure likewise takes place according to common methods.
  • the invention particularly relates to beaches of coniferous wood, more preferably OSB strands of pine wood, but can also be applied to OSB beaches of hardwood or other conifers.
  • Adhesives used for gluing are, in particular, adhesives containing isocyanates.
  • the strands are bleached to have a hue different from the usual hue of the strands, for example a light yellow hue in pinewood.
  • strands are subjected to bleaching, which have a color which deviates from a customary shade, for example reddish and / or gray-black.
  • all strands of an OSB board material can also be bleached, resulting in a particularly uniform color impression.
  • the grit mat is made with outer cover layers, bleaching at least portions of the visible cover layer strands.
  • the board material is produced, for example, as a multilayer, in particular with an odd number of layers, for example three layers, then an OSB board material produced by the disclosed method has, in particular, two outer cover layers and one middle layer or several middle layers. In this case, the layers are shut off from each other, that is aligned with each other.
  • the strands of the cover layers are preferably arranged with their longitudinal axis in the longitudinal direction of the plate (in particular in the production direction) and the strands of the middle layer (s) with their longitudinal axis transversely, for example substantially as far as 90 ° to the cover layers.
  • the strands are particularly preferably bleached by means of an oxidative bleaching agent, the bleaching being carried out for this purpose in particular by means of hydrogen peroxide, and / or organic oxidizing agents such as, for example, aliphatic peroxide and / or hydroperoxide.
  • oxidative bleaching in particular reddish discolored strands can be lightened in a particularly efficient manner.
  • solution of hydrogen peroxide is used.
  • the beaches are bleached by means of a reductive bleaching agent, the reductive bleaching in particular by means of sulfur-containing bleach, such as, for example, ammonium sulfite, Ammonium thiosulfate, formamidinesulfinic acid is performed.
  • sulfur-containing bleach such as, for example, ammonium sulfite, Ammonium thiosulfate, formamidinesulfinic acid
  • preference is given to using 5% by weight to 15% by weight, advantageously 10% by weight, solutions of, for example, ammonium thiosulfate or formamidine sulfinic acid.
  • the bleaching is carried out in several stages, whereby both the oxidative bleaching and the reductive bleaching can be carried out several times, in particular at least twice in succession.
  • the strands are bleached by both an oxidative and a reductive bleach, i. H. subjected to an at least two-stage bleaching process.
  • the individual bleaching stages are carried out in succession and the strands are, for example, washed with water between the bleaching stages in order to improve the lightening of the strands.
  • the bleaching of the strands takes place before the gluing of the strands. That is, the strands become after the cutting of the debarked roundwood and bleached with a possibly subsequent drying process with the bleaching agent.
  • This is done, for example, in the multi-stage bleaching process.
  • Bleaching is most preferably carried out by passing the strands through a bleach bath, ie, a liquid bleach.
  • the strands can also be repeatedly passed through the same bleaching agent or different bleaching agents, for example by an oxidatively acting bleaching agent and / or a reductive bleaching agent.
  • the bleaching agent can also be applied to the strands, for example sprayed on. It is also conceivable, in a multi-stage bleaching process, to guide the strands through a bleach bath and in a further bleaching stage to spray the same bleach or another bleach onto the strands. This can of course also be done in reverse order.
  • the strands are screened for suitability and / or separation of the strands in facing strands and middle strands. Accordingly, in a subsequent bleaching, preferably only the top layer strands are bleached.
  • the bleaching of the strands can also take place after the production of the spreading material mat and before the pressing of the spreading material mat to the board material.
  • the bleaching agent is applied to the finished scattered material mat, for example. Sprayed, and can, before the compression takes place, a predetermined time act on the beach and lighten it.
  • the exposure time of the bleaching agent (the bleaching process) to the strands lasts for a further development of the invention for a maximum of 10 to 20 minutes, preferably 15 minutes +/- 2 minutes.
  • the exposure time begins with the immersion or application of the bleaching agent on the beach and ends with the removal of the beach from the bleach and a. For example. Rinsing with water or with the introduction and the beginning of the pressing process in the hot press.
  • the preferred bleaching time of 10 to 20 minutes, preferably 15 minutes +/- 2 minutes, has surprisingly been found to be particularly effective because against each experience a particularly high average bleaching effect / per unit time is achieved.
  • the bleaching agents are used, in particular, as liquid bleaching agents, for example aqueous solutions used.
  • the bleaching agent contains catalysts. These may be, for example, when using hydrogen peroxide as a bleaching agent iron-containing catalysts or activating salts, in particular manganese dioxide.
  • catalysts may be, for example, when using hydrogen peroxide as a bleaching agent iron-containing catalysts or activating salts, in particular manganese dioxide.
  • tanks containing ferrous components are used.
  • the bleaching is coordinated with the wood-containing strands and the respective bleaching agent according to a development of the invention with a temperature of 15 ° C to 25 ° C.
  • the temperature range of 15 ° C to 25 ° C has surprisingly been found to be particularly suitable for an effective and high bleaching effect of the beach.
  • the particular temperature range allows a particularly high bleaching effect in a short period of time, so that the bleaching can be integrated particularly easily into existing process sequences.
  • structural damage to the wood structure due to high temperatures is successfully avoided.
  • the bleaching with strands is carried out according to a development of the invention, which have a residual moisture content of 80 wt.% To 120 wt.%.
  • the high humidity ensures a good wettability of the beach with the bleach, whereby the bleaching effect (brightening) is significantly improved.
  • all moisture data of the beach refers to dry wood (absolutely dry wood).
  • the drying of the beaches can be done in one or more stages.
  • bleaching is carried out before bleaching by means of a bleaching bath and / or by applying the bleaching agent, preferably at least one drying process takes place after bleaching, so that the bleached strands for gluing have a residual moisture in the range of, for example, from 3% by weight to 6% by weight. atro (Beleimfeuchte).
  • a drying process and / or moistening process can also be carried out before the bleaching in order to set the strands, for example, to a residual moisture content of 80% by weight to 120% by weight, for the bleaching process.
  • a drying process after bleaching and before pressing the grit mat is feasible to prevent, for example, excessive moisture in the press , This can be done, for example, by means of a hot air drying of the surface.
  • the separation and screening of the strands is carried out in particular depending on the structure of the production line and the product to be produced.
  • a multi-layered product such as an OSB panel material with middle layer and two outer layers
  • the middle layer and outer layer strips are produced either on separate production lines or on a common production line.
  • the screening and sorting takes place, for example, in each production line by itself and before the drying of the strands on the Beleimfeuchte (3 wt.% To 6 wt.% Atro), i. at the outer layer strands preferably before bleaching and subsequent drying to the Beleimfeuchte and at the middle layer strands before drying on the Beleimfeuchte.
  • a sorting of the strands in middle layer strands and cover strands if appropriate in addition to, for example, subsequent separation and sorting. If bleaching is carried out before gluing, the sorting is preferably carried out before the bleaching of the strands (for example the cover layer strands). If only a bleaching of the surface of the spreading material mat takes place, the sorting and / or separation can take place, for example, before the gluing of the strands.
  • the strands of the overcoat layers and middle layer (s) are made together or separately and / or in one or more stages be dried, the strands are advantageously set to bleaching before gluing to a residual moisture content of 80 wt.% To 120 wt.% Atro (dried or moistened) and advantageously for gluing to a residual moisture of 3 wt.% To 6 wt.% Atro dried.
  • the discolorations of the strands are detected by color recognition (visual or camera-based), color-striking strands, in particular covering strands, are removed and subjected to bleaching.
  • the strands are preferably sorted into reddish and gray-black discolorations, with strands having a reddish discoloration, in particular an oxidative bleaching, and strands having a gray-black discoloration, in particular a reductive bleaching.
  • the color recognition and the sorting of the strands are carried out in particular after the cutting or drying of the strands.
  • the color recognition and separation takes place in connection with the separation of the strands in cover stratum strands and middle stratum strands and / or with the sighting and sorting out of the respective strands.
  • the color recognition and discharge is preferably carried out at cover layer strands.
  • the color detection can be either visually, d. H. be performed by a person, or by a camera-based color detection system, for example, in combination with a fully automatic discharge device.
  • a color measurement can be carried out to determine the discoloration and / or also for a control of the bleaching result on the untreated and / or bleached strands.
  • the color measurement takes place, for example, by determining the L * a * b * values.
  • the L * a * b * color space is a color space that covers all areas of perceptible colors.
  • the L * a * b * color space is described by a three-dimensional coordinate system.
  • the L * axis describes the brightness (luminance) of the color with values from o (black) to 100 (white).
  • the a * axis describes the green or red portion of a color, with negative values for green and positive values for red.
  • the b * axis describes the blue or yellow part of a color, with negative values for blue and positive values for yellow.
  • the bleaching of the OSB strands especially in pine wood strands, achieves an L * value of between 77 and 82 on the discolored OSB strands, which is close to the L * value of a standard pale yellow hue of pinewood strands equivalent.
  • the measurement of the L * a * b * values is carried out according to EN ISO 11664-4 "Colorimetry - Part 4: CIE 1976 Color Space" 20011-07.
  • FIG. 1 and 2 schematically show the sequence of possible manufacturing processes of an OSB board material, which can be carried out in each case or in partial combination with each other.
  • the procedures comprise the following steps: providing 1 of the roundwood, debarking the roundwood 2, cutting 3 the roundwood in strands.
  • drying / moistening 4 of the strands takes place on, for example, bleaching moisture (80% by weight to 120% by weight of atro).
  • a separation 5a and / or sighting 5b of the strands takes place in which the strands are divided into middle layer and outer layer strands and the respective strands are checked for their suitability.
  • the separated cover layer strands are then subjected to bleaching 10, for example in the bleaching bath or by applying the bleaching agent.
  • bleaching 10 for example in the bleaching bath or by applying the bleaching agent.
  • a drying 12a, 12b of the strands takes place on the glueing moisture, ie on a residual moisture of 3% by weight to 6% by weight of dry.
  • drying / moistening 4 of the strands to the bleaching moisture (80% by weight to 120% by weight atro) is optional and, alternatively or in addition, for example also after the separation 5a / sighting 5b and, for example, limited to the cover layer strands can be.
  • a color detection for example, the cover layer strands, be performed before, with or after the separation 5a / sighting 5b, so that at the top layer strands in addition to the sighting (and sorting) 5b on suitability (especially the size) in addition a discharge of the discolored and to be bleached beach.
  • the discharged strands of the overlay strands are subjected to bleaching.
  • the unbleached and bleached outer layer strands can then be dried separately or together to the Beleimfeuchte. After gluing 6a, 6b, the scattering 7 of the covering layer and middle layer strands takes place to a spreading material mat.
  • a bleaching 11 (see FIG. 2 ) of the surface of the grit mat, ie the visible outer layer strands, eg. By rolling / spraying and exposure to the bleaching agent.
  • the bleached surface of the spreading material mat can still be subjected to a drying process 13.
  • a color measurement is carried out by determining the L * a * b * values of the surfaces of the OSB board material.
  • the production of an OSB board material with two production lines for the separate production of the cover layer strands and middle layer strands can be carried out analogously to this, in particular starting from the gluing 6a, 6b of the strands.
  • the division of the manufacturing process into cover strands and middle strands takes place with the provision 1, debarking 2 or the cutting 3.
  • the sighting 5b (and sorting) or the color recognition of the cover stratum or all subsequent production steps can as FIG. 1 and or FIG. 2 be described described.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)
EP17153994.3A 2017-01-31 2017-01-31 Verfahren zur herstellung eines osb-plattenwerkstoffs Active EP3354430B1 (de)

Priority Applications (5)

Application Number Priority Date Filing Date Title
PT171539943T PT3354430T (pt) 2017-01-31 2017-01-31 Método para o fabrico de um material de painel de osb
EP17153994.3A EP3354430B1 (de) 2017-01-31 2017-01-31 Verfahren zur herstellung eines osb-plattenwerkstoffs
HUE17153994A HUE046683T2 (hu) 2017-01-31 2017-01-31 Eljárás OSB-lapanyag elõállítására
PL17153994T PL3354430T3 (pl) 2017-01-31 2017-01-31 Sposób wytwarzania materiału płyty OSB
ES17153994T ES2747550T3 (es) 2017-01-31 2017-01-31 Procedimiento para producir un material de placa de OSB

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP17153994.3A EP3354430B1 (de) 2017-01-31 2017-01-31 Verfahren zur herstellung eines osb-plattenwerkstoffs

Publications (2)

Publication Number Publication Date
EP3354430A1 EP3354430A1 (de) 2018-08-01
EP3354430B1 true EP3354430B1 (de) 2019-07-10

Family

ID=57995028

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17153994.3A Active EP3354430B1 (de) 2017-01-31 2017-01-31 Verfahren zur herstellung eines osb-plattenwerkstoffs

Country Status (5)

Country Link
EP (1) EP3354430B1 (pl)
ES (1) ES2747550T3 (pl)
HU (1) HUE046683T2 (pl)
PL (1) PL3354430T3 (pl)
PT (1) PT3354430T (pl)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004050278A1 (de) * 2004-10-14 2006-04-27 Basf Ag Helle bis weiße Holzwerkstoffplatten
JP5371955B2 (ja) * 2007-04-24 2013-12-18 ビーエーエスエフ ソシエタス・ヨーロピア 漂白された木材粒子及び淡色ないし白色の木材料の製造方法
DE102007055415C5 (de) * 2007-11-19 2018-11-29 SWISS KRONO Tec AG Verfahren zur Verminderung der Emission von gesättigten und ungesättigten Aldehyden aus Holzwerkstoffen
DE102008059527A1 (de) * 2008-11-28 2010-06-02 Basf Se Effekt-MDF
EP2676794B1 (en) * 2009-06-17 2018-09-05 Välinge Innovation AB Method for manufacturing a panel and a prepreg

Also Published As

Publication number Publication date
PT3354430T (pt) 2019-10-11
PL3354430T3 (pl) 2020-01-31
ES2747550T3 (es) 2020-03-10
HUE046683T2 (hu) 2020-03-30
EP3354430A1 (de) 2018-08-01

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