WO2021106308A1 - 木質積層板の製造方法 - Google Patents

木質積層板の製造方法 Download PDF

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Publication number
WO2021106308A1
WO2021106308A1 PCT/JP2020/033877 JP2020033877W WO2021106308A1 WO 2021106308 A1 WO2021106308 A1 WO 2021106308A1 JP 2020033877 W JP2020033877 W JP 2020033877W WO 2021106308 A1 WO2021106308 A1 WO 2021106308A1
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WO
WIPO (PCT)
Prior art keywords
veneer
core material
catalyst
laminated board
saccharide
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PCT/JP2020/033877
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English (en)
French (fr)
Japanese (ja)
Inventor
内藤　茂樹
田村　俊樹
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パナソニックＩｐマネジメント株式会社
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Application filed by パナソニックＩｐマネジメント株式会社 filed Critical パナソニックＩｐマネジメント株式会社
Priority to CN202080076797.7A priority Critical patent/CN114630741A/zh
Priority to KR1020227013973A priority patent/KR20220066964A/ko
Priority to JP2021561172A priority patent/JP7407403B2/ja
Publication of WO2021106308A1 publication Critical patent/WO2021106308A1/ja

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27D—WORKING VENEER OR PLYWOOD
    • B27D3/00—Veneer presses; Press plates; Plywood presses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27D—WORKING VENEER OR PLYWOOD
    • B27D1/00—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring
    • B27D1/04—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring to produce plywood or articles made therefrom; Plywood sheets
    • 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
    • B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
    • B27K3/34—Organic impregnating agents
    • B27K3/36—Aliphatic compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B21/00—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board
    • B32B21/13—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board all layers being exclusively wood

Definitions

  • the present disclosure generally relates to a method for producing a wood laminate, and more particularly to a method for producing a wood laminate using a plant containing saccharides.
  • Patent Document 1 discloses a composite compacted plywood.
  • the composite compaction plywood is consolidated by laminating an internal laminated material and an outer surface material.
  • the internal laminated material is a laminated product of a plurality of veneers formed from an oil palm material.
  • the outer surface material is another veneer formed from a tree species other than oil palm material.
  • the outer surface material is laminated on at least one surface of the outer surface of the outermost layer of the inner laminated material.
  • Patent Document 1 discloses that a composite compacted plywood having excellent surface quality can be obtained as a result.
  • Patent Document 2 discloses a laminated board.
  • the laminated board is formed by laminating and adhering a surface plate to the surface of the composite board.
  • the composite board is formed by pasting a veneer made of natural wood.
  • the surface board is made of a wood fiber board or a wood shaving board obtained from softwood.
  • Patent Document 2 discloses that the laminated board is suitably used as a surface material or a decorative material in the interior of a building, furniture, and the like.
  • Conifers or hardwoods are used as cosmetic veneers in the composite compacted plywood described in Patent Document 1 and the laminated board described in Patent Document 2, but in recent years, softwoods and hardwoods have been decreasing on a global scale. There is a tendency. Therefore, at present, it is considered to manufacture a wood laminated board without using softwood and hardwood.
  • Patent Document 1 when the outer surface material is formed from a tree species other than softwood and hardwood, the surface quality of the composite compacted plywood may be deteriorated, and there is room for improvement in water resistance. obtain.
  • An object of the present disclosure is to provide a method for producing a wood laminated board capable of producing a wood laminated board having excellent water resistance without using a softwood or hardwood veneer for the surface layer.
  • the method for manufacturing a wood laminated board includes a veneer manufacturing step, a catalyst supply step, and an bonding step.
  • a saccharide-containing veneer is produced from a plant containing saccharides.
  • a polyvalent carboxylic acid is supplied to the saccharide-containing veneer to obtain a catalyst-containing veneer.
  • the catalyst-containing veneer is laminated on both sides or one side of the core material, and thermal pressure treatment is performed to bond the catalyst-containing veneer and the core material. The sugar-containing veneer is more easily compressed than the core material.
  • 1A and 1B are schematic cross-sectional views showing a method for manufacturing a wood laminated board according to the first embodiment.
  • 2A to 2C are schematic cross-sectional views showing a method for manufacturing a wood laminated board according to a second embodiment.
  • 3A and 3B are schematic cross-sectional views showing a method of manufacturing a wood laminated board according to a third embodiment.
  • 4A to 4C are schematic cross-sectional views showing a method for manufacturing a wood laminated board according to a fourth embodiment.
  • a wood laminated board 1 provided with a decorative veneer that can replace softwoods and hardwoods having excellent aesthetic appearance.
  • the method for manufacturing the wood laminated board 1 includes a veneer manufacturing step, a catalyst supply step, and an bonding step.
  • the saccharide-containing veneer 4 is produced from a plant containing saccharides.
  • a polyvalent carboxylic acid is supplied to the saccharide-containing veneer 4 to obtain a catalyst-containing veneer 7.
  • the catalyst-containing veneer 7 is laminated on both sides or one side of the core material 3 and subjected to thermal pressure treatment to bond the catalyst-containing veneer 7 and the core material 3 (see FIGS. 1A and 1B).
  • the wood laminated board 1 as shown in FIG. 1B can be obtained.
  • the saccharide-containing veneer 4 becomes a surface layer 70 via the catalyst-containing veneer 7.
  • the core material 3 is the core layer 30.
  • the saccharide-containing veneer 4 finally forms the surface layer 70 of the wood laminated board 1.
  • the saccharide-containing veneer 4 is more easily compressed than the core material 3. Even if the saccharide-containing veneer 4 becomes the catalyst-containing veneer 7, it is more easily compressed than the core material 3.
  • the catalyst-containing veneer 7 is located between the heating plate (hot plate) of the thermal pressure press and the core material 3. Since the catalyst-containing veneer 7 is more easily compressed than the core material 3, when the thermal pressure treatment is performed, pressure is intensively applied to the catalyst-containing veneer 7. As a result, the catalyst-containing veneer 7 is highly compacted, and it becomes difficult for water to permeate.
  • the wood laminated board 1 it is possible to suppress the infiltration of water from the surface layer 70 located on the surface to the core layer 30 located inside. Further, since the surface layer 70 is highly compacted, the surface hardness of the wood laminated board 1 can be improved. Further, the surface texture of the wood laminated board 1 becomes finer, and the aesthetic appearance can be improved. At the time of thermal pressure treatment, the core material 3 is also consolidated, but the degree is lower than that of the catalyst-containing veneer 7.
  • one of the features of the present embodiment is that the saccharide-containing veneer 4 (catalyst-containing veneer 7) is more easily compressed than the core material 3, but such a feature must be adopted. , The following problems can occur.
  • the sugar-containing veneer 4 (catalyst-containing veneer 7) and the core material 3 are easily compressed to the same extent, if the surface layer 70 is to be highly compacted, the core layer 30 also needs to be highly compacted. is there. In this case, since the pressure of the hot pressure press must be increased, the size of the manufacturing equipment is increased, and there is a concern that the manufacturing cost will increase.
  • the thickness of the core layer 30 is reduced because the core layer 30 is highly compacted. Therefore, the thickness of the core layer 30 must be adjusted in advance in anticipation of the decrease. For example, when the core layer 30 is formed of a plurality of veneers, it is necessary to add more veneers in anticipation of the above reduction.
  • the saccharide-containing veneer 4 (catalyst-containing veneer 7) is more easily compressed than the core material 3, so that the above problems are less likely to occur.
  • FIG. 1B shows a wood laminated board 1 according to the present embodiment.
  • the wood laminated board 1 includes a surface layer 70 and a core layer 30.
  • the surface layer 70 is adhered to both sides or one side of the core layer 30 (both sides in this embodiment).
  • the surface layer 70 is an outer layer
  • the core layer 30 is an inner layer.
  • the surface layer 70 is formed of a catalyst-containing veneer 7.
  • the catalyst-containing veneer 7 is obtained by supplying a catalyst (polyvalent carboxylic acid) to the saccharide-containing veneer 4.
  • the sugar-containing veneer 4 finally forms the surface layer 70 of the wood laminated board 1.
  • the sugar-containing veneer 4 may form the core layer 30 of the wood laminated board 1.
  • the method for manufacturing the wood laminated board 1 according to the present embodiment includes a veneer manufacturing step, a catalyst supply step, and an bonding step. Hereinafter, each step of the method for manufacturing the wood laminated board 1 will be described.
  • the veneer manufacturing step is a step of manufacturing a saccharide-containing veneer 4 from a plant containing saccharides.
  • the saccharide-containing veneer 4 is a veneer obtained from a plant containing saccharides. Plants containing sugars are woody plants and have woody stems (tree trunks). The plant is preferably palm (palm), and among the palms, oil palm and coconut are preferable. This is because palm contains a relatively large amount of sugar compared to other plants. As a result, the water resistance and strength of the wood laminated board 1 are improved.
  • the sugars contained in plants are monosaccharides, disaccharides and polysaccharides (including oligosaccharides). Disaccharides and polysaccharides are composed of a plurality of monosaccharides linked by glycosidic bonds.
  • the plant may contain only one type of saccharide or two or more types of saccharides.
  • the total content of the monosaccharide and the disaccharide is preferably 5% by mass or more with respect to the mass of the veneer (solid content).
  • monosaccharides include fructose, ribose, arabinose, rhamnose, xylulose and deoxyribose.
  • disaccharide examples include sucrose, maltose, trehalose, turanose, lactulose, maltulose, palatinose, genthiobiulose, melibiulose, galactosucrose, rutinulose and planteobiose.
  • polysaccharides examples include starch, agarose, alginic acid, glucomannan, inulin, chitin, chitosan, hyaluronic acid, glycogen and cellulose.
  • oligosaccharides include fructooligosaccharides, galactooligosaccharides, mannan oligosaccharides and stachyose.
  • the sugar-containing veneer 4 can be obtained by cutting a plant log with a cutting machine.
  • Cutting machines include, for example, rotary races and slicers.
  • the thickness of the sugar-containing veneer 4 is not particularly limited, but is, for example, in the range of 2 mm or more and 8 mm or less.
  • the density of the saccharide-containing veneer 4 is not particularly limited, but is preferably in the range of 300 kg / m 3 or more and 500 kg / m 3 or less, and more preferably in the range of 350 kg / m 3 or more and 450 kg / m 3 or less. ..
  • the catalyst supply step is a step of supplying a polyvalent carboxylic acid to the saccharide-containing veneer 4 to obtain the catalyst-containing veneer 7.
  • the catalyst-containing veneer 7 is a veneer in which a polyvalent carboxylic acid is supplied as a catalyst to the saccharide-containing veneer 4.
  • the catalyst-containing veneer 7 contains a saccharide and a polyvalent carboxylic acid.
  • the polyvalent carboxylic acid is not particularly limited as long as it is a compound having a plurality of carboxy groups.
  • polyvalent carboxylic acids include citric acid, tartaric acid, malic acid, gluconic acid, sebacic acid, itaconic acid, succinic acid, oxalic acid, adipic acid, malonic acid, phthalic acid, maleic acid, fumaric acid, and glutaric acid (1). , 5-Pentanedioic acid), glutaconic acid and pentendioic acid. Acid anhydrides can also be used as the polyvalent carboxylic acid.
  • citric acid, tartaric acid, malic acid, gluconic acid, sebacic acid, and itaconic acid are particularly preferable because they can be produced from plants as raw materials. When plants are used as raw materials in this way, the use of fossil resources is suppressed, so that the wood laminated board 1 can be obtained without imposing a burden on the environment.
  • the polycarboxylic acid is synonymous with a polycarboxylic acid.
  • the polyvalent carboxylic acid is supplied as a polyvalent carboxylic acid solution (for example, a polyvalent carboxylic acid aqueous solution).
  • a polyvalent carboxylic acid solution for example, a polyvalent carboxylic acid aqueous solution.
  • the polyvalent carboxylic acid is easily impregnated into the saccharide-containing veneer 4.
  • the water resistance of the wood laminated board 1 can be further improved.
  • the polyvalent carboxylic acid can be supplied to the saccharide-containing veneer 4 as follows. That is, the polyvalent carboxylic acid aqueous solution can be sprayed toward the saccharide-containing veneer 4 by spraying or the like. Further, the saccharide-containing veneer 4 can be immersed in a polyvalent carboxylic acid aqueous solution. Further, the polyvalent carboxylic acid aqueous solution can be applied to the saccharide-containing veneer 4 with a roll or a brush. Further, the powder of the polyvalent carboxylic acid can be directly sprayed on the saccharide-containing veneer 4.
  • the polyvalent carboxylic acid when supplied to the saccharide-containing veneer 4, the polyvalent carboxylic acid may be in an aqueous solution state or in a powder state.
  • the concentration of the polyvalent carboxylic acid aqueous solution is not particularly limited, but is, for example, in the range of 1% by mass or more and 50% by mass or less.
  • the supply amount of polyvalent carboxylic acid is not particularly limited.
  • the supply amount of the polyvalent carboxylic acid is defined by, for example, the mass of the polyvalent carboxylic acid present per unit volume of the saccharide-containing veneer 4.
  • the supply amount of the polyvalent carboxylic acid is in the range of 0.5% by mass or more and 5% by mass or less in terms of solid content ratio.
  • ⁇ Adhesion process ⁇ 1A and 1B show the state of the bonding process.
  • the catalyst-containing veneer 7 is laminated on both sides or one side of the core material 3 (both sides in this embodiment), and heat pressure treatment (hot press) is performed to bond the catalyst-containing veneer 7 and the core material 3. It is a process.
  • the catalyst-containing veneer 7 and the core material 3 are integrated to obtain a wood laminated board 1 as shown in FIG. 1B.
  • the core material 3 contains a plurality of saccharide-containing veneers 4.
  • the plurality of sugar-containing veneers 4 are laminated.
  • a polyvalent carboxylic acid or an adhesive is supplied to the plurality of sugar-containing veneers 4.
  • the plurality of sugar-containing veneers 4 contained in the core material 3 have not yet been adhered.
  • the saccharide-containing veneer 4 located on the outermost side of the core material 3 may be referred to as the outermost veneer 40.
  • the fiber direction (grain direction) of each of the plurality of sugar-containing veneers 4 contained in the core material 3 is not particularly limited.
  • the fiber directions of the adjacent saccharide-containing veneers 4 may be non-parallel or parallel.
  • the fiber directions of the saccharide-containing veneer 4 (catalyst-containing veneer 7) and the outermost veneer 40 to be the surface layer 70 may be non-parallel or parallel.
  • non-parallel includes orthogonality.
  • the adhesive may be supplied to the plurality of sugar-containing veneers 4.
  • the adhesive is not particularly limited, and examples thereof include a urea-melamine-based adhesive and a phenol-based adhesive.
  • the method of supplying the adhesive is not particularly limited, and examples thereof include coating.
  • the supply amount (coating amount) of the adhesive is not particularly limited.
  • the amount of the adhesive supplied is defined by, for example, the mass of the adhesive present per unit area of the saccharide-containing veneer 4.
  • the supply amount of the adhesive is in the range of 200 g / m 2 or more and 500 g / m 2 or less.
  • the peeling strength of the wood laminated board 1 can be improved by supplying either the polyvalent carboxylic acid or the adhesive to the plurality of sugar-containing veneers 4 contained in the core material 3.
  • the saccharide-containing veneer 4 (catalyst-containing veneer 7) serving as the surface layer 70 is more easily compressed than the core material 3 serving as the core layer 30. Even if the saccharide-containing veneer 4 becomes the catalyst-containing veneer 7, it is more easily compressed than the core material 3.
  • the saccharide-containing veneer 4 (catalyst-containing veneer 7) to be the surface layer 70 is more likely to be compressed than the outermost veneer 40 adjacent thereto. ..
  • the compressibility can be compared by the density after each compression when the two test pieces to be compared are compressed in the thickness direction at the same pressure.
  • the denser the test piece after compression the easier it is to be compressed.
  • This compressibility can be adjusted by the moisture content of the two test pieces to be compared.
  • the test piece with higher water content is more likely to be compressed. Therefore, by making the water content of the saccharide-containing veneer 4 to be the surface layer 70 higher than the water content of the core material 3, the saccharide-containing veneer 4 can be more easily compressed than the core material 3. As a result, the saccharide-containing veneer 4 is more easily compressed than the core material 3.
  • the moisture content can be adjusted by drying conditions (temperature, time, etc.) or by humidification.
  • the water content can be calculated as follows. First, the masses of the two test pieces to be compared (W 1 : mass before drying) are measured. Next, these are dried in a dryer at 103 ⁇ 2 ° C., and the mass (W 2 : total dry mass) when it is recognized that the constant amount has been reached is measured. Then, the water content of the two test pieces can be calculated by the following formula (1).
  • the saccharide-containing veneer 4 (catalyst-containing veneer 7) serving as the surface layer 70 is more easily compressed than the core material 3 serving as the core layer 30 for the following reasons.
  • the catalyst-containing veneer 7 is located between the heating plate (hot plate) of the thermal pressure press and the core material 3.
  • the core material 3 is also compressed, but the catalyst-containing veneer 7 sandwiched between the core material 3 and the hot plate is further compressed than the core material 3.
  • the catalyst-containing veneer 7 is highly compacted, and it becomes difficult for water to permeate. Therefore, in the wood laminated board 1, it is possible to suppress the infiltration of water from the surface layer 70 located on the surface to the core layer 30 located inside. Further, since the surface layer 70 is highly compacted, the surface hardness of the wood laminated board 1 can be improved. Further, the surface texture of the wood laminated board 1 becomes finer, and the aesthetic appearance can be improved.
  • the thermal pressure treatment is a treatment of pressing while heating.
  • a known compression device press
  • the heat source is not particularly limited, and examples thereof include steam, hot water, electric heat, and high frequency.
  • the press method is not particularly limited, and examples thereof include a flat plate (one-stage, multi-stage) press method and a roll (continuous) press method.
  • the temperature of the thermal pressure treatment is not particularly limited, but is, for example, in the range of 140 ° C. or higher and 230 ° C. or lower.
  • the pressure of the thermal pressure treatment is preferably in the range of 0.5 MPa or more and 4 MPa or less. The higher the pressure within this range, the smoother the surface of the wood laminated board 1 can be improved.
  • the time of the thermal pressure treatment is preferably in the range of 10 seconds or more and 30 minutes or less.
  • the curing reaction means a reaction between a saccharide and a polyvalent carboxylic acid. It is presumed that the catalyst-containing veneer 7 is completely cured through a two-step reaction when heat-treated.
  • the first stage reaction proceeds by the heat treatment
  • the second stage reaction proceeds and is completed by the further heat treatment.
  • the catalyst-containing veneer 7 becomes a cured product upon completion of the reaction in the second stage.
  • the reaction product of the saccharide and the polyvalent carboxylic acid for example, the sugar citrate reaction product
  • the reaction product of the saccharide and the polyvalent carboxylic acid becomes thermosetting.
  • the fibers inside the catalyst-containing veneer 7 are adhered to each other.
  • the reactants include a substance before the reaction and a substance (product) after the reaction.
  • the sugars contained in the plant are hydrolyzed to produce a hydrolysis product. Further, the hydrolysis product is dehydrated and condensed to produce a reaction product of a sugar denaturing product. The condensed water generated at this time is removed by an appropriate method.
  • sucrose sucrose
  • fructose sucrose
  • furfural specifically, 5- (hydroxymethyl) furfural
  • Furfural which is a sugar-modified product, becomes a thermosetting resin, furan resin, by further heat treatment, and is cured in the presence of a polyvalent carboxylic acid.
  • glucose becomes a sugar ester polymer by a dehydration condensation reaction and is cured.
  • the stage of pressurization is not particularly limited.
  • pressurization may be performed from the start of the first stage to the end of the second stage, or may be performed from the start of the second stage to the end of the second stage without performing in the first stage.
  • the method for manufacturing the wood laminated board 1 according to the present embodiment includes a veneer manufacturing step, a catalyst supply step, and an bonding step.
  • the method for producing the wood laminated board 1 further includes a polishing step.
  • the veneer manufacturing process and the catalyst supply process are the same as those in the first embodiment.
  • the bonding process is performed only once, but in the present embodiment, the bonding process is divided into two times.
  • the bonding process is roughly divided into a first bonding process (FIGS. 2A to 2B) and a second bonding process (FIGS. 2B to 2C).
  • the first bonding step is a step of stacking and bonding a plurality of sugar-containing veneers 4 to obtain a core material 3.
  • An adhesive or a polyvalent carboxylic acid is supplied to the plurality of sugar-containing veneers 4.
  • an adhesive or a polyvalent carboxylic acid is interposed between adjacent saccharide-containing veneers 4.
  • cold pressure treatment cold press
  • hot pressure treatment hot pressure treatment
  • the cold pressure treatment is a treatment of pressing at room temperature without heating.
  • the thermal pressure treatment is as described above. In this way, the plurality of sugar-containing veneers 4 are integrated by the cold pressure treatment and the hot pressure treatment to obtain the core material 3 as the plate material 6.
  • a plurality of sugar-containing veneers 4 are stacked to form a laminated body.
  • the adhesive is supplied to the plurality of sugar-containing veneers 4.
  • the fiber direction of each of the plurality of sugar-containing veneers 4 is not particularly limited.
  • the fiber directions of the adjacent saccharide-containing veneers 4 may be non-parallel or parallel.
  • the press method is not particularly limited, and examples thereof include a flat plate (one-stage, multi-stage) press method and a roll (continuous) press method.
  • the pressure of the cold pressure treatment is not particularly limited, but is, for example, in the range of 0.5 MPa or more and 4 MPa or less.
  • the time of the cold pressure treatment is not particularly limited, but is, for example, in the range of 10 seconds or more and 20 minutes or less.
  • the plate material 6 includes a plywood and / or a veneer laminated material. As a result, various wood laminated boards 1 can be obtained depending on the type of board material 6.
  • the temperature of the thermal pressure treatment is not particularly limited, but when the adhesive is supplied to the plurality of sugar-containing veneers 4 as described above, it is preferably in the range of 80 ° C. or higher and 150 ° C. or lower, more preferably. It is in the range of 105 ° C. or higher and 150 ° C. or lower.
  • the pressure of the thermal pressure treatment is not particularly limited, but is, for example, in the range of 0.5 MPa or more and 4 MPa or less.
  • the time of the thermal pressure treatment is not particularly limited, but is, for example, in the range of 10 seconds or more and 15 minutes or less.
  • a plurality of sugar-containing veneers 4 are stacked to form a laminated body.
  • the polyvalent carboxylic acid is supplied to the plurality of sugar-containing veneers 4.
  • the fiber direction of each of the plurality of sugar-containing veneers 4 is not particularly limited.
  • the fiber directions of the adjacent saccharide-containing veneers 4 may be non-parallel or parallel.
  • the plate material 6 includes a plywood and / or a veneer laminated material. As a result, various wood laminated boards 1 can be obtained depending on the type of board material 6.
  • the temperature of the thermal pressure treatment is not particularly limited, but when the polyvalent carboxylic acid is supplied to the plurality of saccharide-containing veneers 4 as described above, it is preferably in the range of 140 ° C. or higher and 230 ° C. or lower.
  • the pressure of the thermal pressure treatment is not particularly limited, but is, for example, in the range of 0.5 MPa or more and 4 MPa or less.
  • the time of the thermal pressure treatment is not particularly limited, but is, for example, in the range of 10 seconds or more and 15 minutes or less.
  • the second bonding step is a step of adhering the catalyst-containing veneer 7 to both sides or one side of the core material 3 as the plate material 6 obtained in the first bonding step.
  • the thermal pressure treatment second time
  • the core material 3 and the catalyst-containing veneer 7 are laminated to form a laminated body.
  • the catalyst-containing veneer 7 is arranged on both sides of the core material 3, but the catalyst-containing veneer 7 may be arranged only on one side of the core material 3.
  • the fiber directions of the outermost veneer 40 located on the surface of the core material 3 and the catalyst-containing veneer 7 may be non-parallel or parallel.
  • the temperature of the thermal pressure treatment is not particularly limited, but is preferably in the range of 140 ° C. or higher and 230 ° C. or lower.
  • the pressure of the thermal pressure treatment is not particularly limited, but is, for example, in the range of 0.5 MPa or more and 4 MPa or less.
  • the time of the thermal pressure treatment is not particularly limited, but is, for example, in the range of 10 seconds or more and 30 minutes or less.
  • the saccharide-containing veneer 4 (catalyst-containing veneer 7) to be the surface layer 70 is more easily compressed than the core material 3, so that when thermal pressure treatment is performed, the catalyst-containing veneer 7 is concentrated. Pressure is applied. At this time, the core material 3 is also compressed, but the catalyst-containing veneer 7 sandwiched between the core material 3 and the hot plate is further compressed than the core material 3. As a result, the catalyst-containing veneer 7 is highly compacted, and it becomes difficult for water to permeate. Therefore, in the wood laminated board 1, it is possible to suppress the infiltration of water from the surface layer 70 located on the surface to the core layer 30 located inside. Further, since the surface layer 70 is highly compacted, the surface hardness of the wood laminated board 1 can be improved. Further, the surface texture of the wood laminated board 1 becomes finer, and the aesthetic appearance can be improved.
  • the polishing step is located between the first bonding step and the second bonding step.
  • the polishing step is a step of polishing both sides or one side of the core material 3 as the plate material 6 obtained in the first bonding step.
  • the catalyst-containing veneer 7 is superposed on the polished surface of the core material 3.
  • polishing padding paper can be used for polishing (sanding).
  • the material and particle size of the abrasive material used for the abrasive cloth paper are not particularly limited.
  • the method for manufacturing the wood laminated board 1 according to the present embodiment includes a veneer manufacturing step, a catalyst supply step, and an bonding step.
  • the veneer manufacturing process and the catalyst supply process are the same as those in the first embodiment.
  • the core material 3 used in the bonding step is different between the present embodiment and the first embodiment.
  • ⁇ Adhesion process ⁇ 3A and 3B show the state of the bonding process.
  • the catalyst-containing veneer 7 is laminated on both sides or one side of the core material 3 (both sides in this embodiment), and heat pressure treatment (hot press) is performed to bond the catalyst-containing veneer 7 and the core material 3. It is a process.
  • the catalyst-containing veneer 7 and the core material 3 are integrated to obtain a wood laminated board 1 as shown in FIG. 3B.
  • the core material 3 includes a plurality of veneers 5.
  • the veneer 5 in this case is not particularly limited.
  • the veneer 5 may be a saccharide-containing veneer 4 or a veneer other than the saccharide-containing veneer 4.
  • the veneer 5 may be a veneer obtained from a coniferous tree (for example, Sugi) or a veneer obtained from a hardwood (for example, Lauan).
  • the plurality of veneers 5 are laminated.
  • An adhesive is supplied to the plurality of veneers 5. Before the thermal pressure treatment, the plurality of veneers 5 contained in the core material 3 have not yet been bonded.
  • the veneer 5 located on the outermost side of the core material 3 may be referred to as the outermost veneer 50.
  • the fiber direction (wood grain direction) of each of the plurality of veneers 5 contained in the core material 3 is not particularly limited.
  • the fiber directions of the adjacent veneers 5 may be non-parallel or parallel.
  • the fiber directions of the saccharide-containing veneer 4 (catalyst-containing veneer 7) and the outermost veneer 50 to be the surface layer 70 may be non-parallel or parallel.
  • the adhesive supplied to the plurality of veneers 5 is not particularly limited, and examples thereof include a urea-melamine-based adhesive and a phenol-based adhesive.
  • the method of supplying the adhesive is not particularly limited, and examples thereof include coating.
  • the supply amount (coating amount) of the adhesive is not particularly limited.
  • the amount of the adhesive supplied is defined by, for example, the mass of the adhesive present per unit area of the veneer 5.
  • the supply amount of the adhesive is in the range of 200 g / m 2 or more and 500 g / m 2 or less.
  • the peeling strength of the wood laminated board 1 can be improved.
  • the saccharide-containing veneer 4 (catalyst-containing veneer 7) to be the surface layer 70 is more easily compressed than the core material 3, so that when thermal pressure treatment is performed, the catalyst-containing veneer 7 is concentrated. Pressure is applied. At this time, the core material 3 is also compressed, but the catalyst-containing veneer 7 sandwiched between the core material 3 and the hot plate is further compressed than the core material 3. As a result, the catalyst-containing veneer 7 is highly compacted, and it becomes difficult for water to permeate. Therefore, in the wood laminated board 1, it is possible to suppress the infiltration of water from the surface layer 70 located on the surface to the core layer 30 located inside. Further, since the surface layer 70 is highly compacted, the surface hardness of the wood laminated board 1 can be improved. Further, the surface texture of the wood laminated board 1 becomes finer, and the aesthetic appearance can be improved.
  • the method for manufacturing the wood laminated board 1 according to the present embodiment includes a veneer manufacturing step, a catalyst supply step, and an bonding step.
  • the method for producing the wood laminated board 1 further includes a polishing step.
  • the veneer manufacturing process and the catalyst supply process are the same as those in the first embodiment.
  • the bonding step is almost the same as that of the second embodiment, but the core material 3 used in the bonding step is different between the present embodiment and the second embodiment.
  • the polishing step is the same as that of the second embodiment.
  • the bonding process is roughly divided into a first bonding process (FIGS. 4A to 4B) and a second bonding process (FIGS. 4B to 4C).
  • the first bonding step is a step of stacking and bonding a plurality of veneers 5 to obtain a core material 3.
  • the veneer 5 is the same as that of the third embodiment.
  • cold pressure treatment and hot pressure treatment are performed.
  • the cold pressure treatment and the hot pressure treatment are as described above.
  • the plurality of veneers 5 are integrated by the cold pressure treatment and the hot pressure treatment to obtain the core material 3 as the plate material 6.
  • a plurality of veneers 5 are stacked to form a laminated body.
  • the adhesive is supplied to the plurality of veneers 5.
  • an adhesive is interposed between the adjacent veneers 5.
  • the fiber direction of each of the plurality of veneers 5 is not particularly limited.
  • the fiber directions of the adjacent veneers 5 may be non-parallel or parallel.
  • the press method is not particularly limited, and examples thereof include a flat plate (one-stage, multi-stage) press method and a roll (continuous) press method.
  • the pressure of the cold pressure treatment is not particularly limited, but is, for example, in the range of 0.5 MPa or more and 4 MPa or less.
  • the time of the cold pressure treatment is not particularly limited, but is, for example, in the range of 10 seconds or more and 20 minutes or less.
  • the plate material 6 includes a plywood and / or a veneer laminated material. As a result, various wood laminated boards 1 can be obtained depending on the type of board material 6.
  • the temperature of the thermal pressure treatment is not particularly limited, but is preferably in the range of 80 ° C. or higher and 150 ° C. or lower, and more preferably in the range of 105 ° C. or higher and 150 ° C. or lower.
  • the pressure of the thermal pressure treatment is not particularly limited, but is, for example, in the range of 0.5 MPa or more and 4 MPa or less.
  • the time of the thermal pressure treatment is not particularly limited, but is, for example, in the range of 10 seconds or more and 15 minutes or less.
  • the second bonding step is a step of bonding the catalyst-containing veneer 7 to both sides or one side of the core material 3 obtained in the first bonding step. In the second bonding step, only the thermal pressure treatment (second time) is performed.
  • the core material 3 and the catalyst-containing veneer 7 are laminated to form a laminated body.
  • the catalyst-containing veneer 7 is arranged on both sides of the core material 3, but the catalyst-containing veneer 7 may be arranged only on one side of the core material 3.
  • the fiber directions of the outermost veneer 50 located on the surface of the core material 3 and the catalyst-containing veneer 7 may be non-parallel or parallel.
  • the temperature of the thermal pressure treatment is not particularly limited, but is preferably in the range of 140 ° C. or higher and 230 ° C. or lower.
  • the pressure of the thermal pressure treatment is not particularly limited, but is, for example, in the range of 0.5 MPa or more and 4 MPa or less.
  • the time of the thermal pressure treatment is not particularly limited, but is, for example, in the range of 10 seconds or more and 30 minutes or less.
  • the saccharide-containing veneer 4 (catalyst-containing veneer 7) to be the surface layer 70 is more easily compressed than the core material 3, so that when thermal pressure treatment is performed, the catalyst-containing veneer 7 is concentrated. Pressure is applied. At this time, the core material 3 is also compressed, but the catalyst-containing veneer 7 sandwiched between the core material 3 and the hot plate is further compressed than the core material 3. As a result, the catalyst-containing veneer 7 is highly compacted, and it becomes difficult for water to permeate. Therefore, in the wood laminated board 1, it is possible to suppress the infiltration of water from the surface layer 70 located on the surface to the core layer 30 located inside. Further, since the surface layer 70 is highly compacted, the surface hardness of the wood laminated board 1 can be improved. Further, the surface texture of the wood laminated board 1 becomes finer, and the aesthetic appearance can be improved.
  • the above-mentioned board materials include board materials obtained from softwoods and board materials obtained from hardwoods.
  • the above-mentioned plate materials include plywood, veneer laminated material (LVL), and lumbar core plywood.
  • the first aspect is a method for manufacturing a wood laminated board (1), which includes a veneer manufacturing step, a catalyst supply step, and an bonding step.
  • a saccharide-containing veneer (4) is produced from a plant containing saccharides.
  • a polyvalent carboxylic acid is supplied to the saccharide-containing veneer (4) to obtain a catalyst-containing veneer (7).
  • the catalyst-containing veneer (7) is laminated on both sides or one side of the core material (3), and heat pressure treatment is performed to bond the catalyst-containing veneer (7) and the core material (3). To do.
  • the sugar-containing veneer (4) is more easily compressed than the core material (3).
  • the second aspect is the method for manufacturing the wood laminated board (1) based on the first aspect.
  • the water content of the saccharide-containing veneer (4) is higher than the water content of the core material (3).
  • the saccharide-containing veneer (4) is more easily compressed than the core material (3).
  • the third aspect is a method for manufacturing a wood laminated board (1) based on the first or second aspect.
  • the core material (3) contains a plurality of the sugar-containing veneer (4).
  • a polyvalent carboxylic acid or an adhesive is supplied to the plurality of sugar-containing veneers (4).
  • the peeling strength of the wood laminated board (1) can be improved.
  • the fourth aspect is the method for manufacturing the wood laminated board (1) based on the first or second aspect.
  • the core material (3) includes a plurality of veneers (5).
  • An adhesive is supplied to the plurality of veneers (5).
  • the peeling strength of the wood laminated board (1) can be improved.
  • the fifth aspect is the method for manufacturing the wood laminated board (1) based on the first or second aspect.
  • the core material (3) includes a plate material (6).
  • the plate material (6) includes a plywood and / or a veneer laminated material.
  • various wood laminated boards (1) can be obtained depending on the type of board material (6).
  • the sixth aspect is a method for manufacturing a wood laminated board (1) based on any one of the first to fifth aspects.
  • the surface of the core material (3) on which the catalyst-containing veneer (7) is stacked is polished.
  • the peeling strength of the wood laminated board (1) can be improved.
  • Example 1 ⁇ Sugar-containing veneer> A coconut veneer (OPT) was used as the sugar-containing veneer. The thickness and density of the saccharide-containing veneer are shown in the surface column of Table 1.
  • Catalyst-containing veneer A catalyst (an aqueous solution of citric acid having a concentration of 3% by mass) was applied to both surfaces of the saccharide-containing veneer to obtain a catalyst-containing veneer. The catalyst was adjusted and applied so as to be 1% by mass with respect to the total mass (solid content) of the catalyst and the coconut veneer. Then, the catalyst-containing veneer was dried at 80 ° C. to adjust the water content to 10% by mass.
  • ⁇ Core material> A coconut veneer (OPT) was used as the sugar-containing veneer.
  • OPT coconut veneer
  • the thickness, density, and number of core material layers of the saccharide-containing veneer are shown in the core layer column of Table 1.
  • a catalyst an aqueous solution of citric acid having a concentration of 8% by mass
  • the catalyst was adjusted and applied so as to be 3% by mass with respect to the total mass (solid content) of the catalyst and the coconut veneer.
  • the saccharide-containing veneer coated with the catalyst was dried at 80 ° C. to adjust the water content to 3% by mass or less.
  • ⁇ Wood laminated board> a catalyst-containing veneer was laminated on both sides of the core material, and thermal pressure treatment was performed using a compression device.
  • Table 2 shows the conditions of thermal pressure treatment. A distance bar is attached between the upper and lower hot plates of the compression device, and the thickness of the wood laminated plate is kept constant (12 mm) by setting the distance between the distance bars to 12 mm.
  • the wood laminated board was manufactured as described above.
  • Table 2 shows the thickness and density of the wood laminated board.
  • Example 2 A wood laminated board was produced in the same manner as in Example 1 except that the water content of the catalyst-containing veneer used for the surface layer was changed to 12% by mass by adjusting the drying time.
  • Example 3 A wood laminated board was produced in the same manner as in Example 2 except that the conditions of the thermal pressure treatment were changed.
  • Example 4 ⁇ Sugar-containing veneer> It is the same as Example 1.
  • ⁇ Core material> The same palm veneer (OPT) as in Example 1 was used as the sugar-containing veneer. Adhesive was applied to both sides of the sugar-containing veneer. A urea-melamine adhesive was used as the adhesive. The amount of adhesive applied is shown in the column of core layer in Table 1.
  • ⁇ Wood laminated board> A wood laminated board was produced in the same manner as in Example 1 except that the above core material was used instead of the core material of Example 1 and the conditions (time) of the thermal pressure treatment were further changed.
  • Example 5 A wood laminated board was produced in the same manner as in Example 4 except that both sides of the core material were not polished.
  • Example 6 ⁇ Sugar-containing veneer> It is the same as Example 1.
  • ⁇ Core material> Commercially available softwood plywood was used as the core material. The thickness and moisture content of this softwood plywood are shown in the core layer column of Table 1. Both sides of softwood plywood were polished. The number of abrasive cloth is shown in the sanding column of Table 1. Adhesive was applied to both sides of the softwood plywood. A urea-melamine adhesive was used as the adhesive. The amount of adhesive applied is shown in the column of core layer in Table 1.
  • ⁇ Wood laminated board> A wood laminated board was produced in the same manner as in Example 4 except that the above core material was used instead of the core material of Example 4.
  • Example 1 A wood laminated board was produced in the same manner as in Example 1 except that the water content of the catalyst-containing veneer used for the surface layer was changed to 3% by mass or less (same as the water content of the core material) by adjusting the drying time. did.
  • Example 2 A coconut veneer (OPT) was used as the sugar-containing veneer. The thickness, density, number of layers, and moisture content of the saccharide-containing veneer are shown in the core layer column of Table 1. Adhesive was applied to both sides of the sugar-containing veneer. A urea-melamine adhesive was used as the adhesive. The amount of adhesive applied is shown in the column of core layer in Table 1.
  • Table 2 shows the conditions for cold pressure treatment and hot pressure treatment.
  • the thickness of the wood laminated board was made constant (12 mm) by setting the distance between the distance bars to 12 mm.
  • MLH Mated Light Hardwoods
  • Table 2 shows the conditions for cold pressure treatment and hot pressure treatment. In this way, a wood laminated board was manufactured.
  • Arithmetic mean roughness (Ra) is 3.2 ⁇ m or less
  • B Arithmetic mean roughness (Ra) is more than 3.2 ⁇ m and 6.3 ⁇ m or less
  • C Arithmetic mean roughness (Ra) is more than 6.3 ⁇ m.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Veneer Processing And Manufacture Of Plywood (AREA)
  • Laminated Bodies (AREA)
PCT/JP2020/033877 2019-11-29 2020-09-08 木質積層板の製造方法 WO2021106308A1 (ja)

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JP2014124801A (ja) * 2012-12-25 2014-07-07 Mywood 2 Kk 植物成型体及びその成型方法
EP2944461A1 (en) * 2014-05-16 2015-11-18 Samko Timber Limited A panel of laminated veneer lumber and/or laminated veneer board for outdoor usage
JP2018051837A (ja) * 2016-09-27 2018-04-05 パナソニックＩｐマネジメント株式会社 改質木材の製造方法

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JP2014124801A (ja) * 2012-12-25 2014-07-07 Mywood 2 Kk 植物成型体及びその成型方法
EP2944461A1 (en) * 2014-05-16 2015-11-18 Samko Timber Limited A panel of laminated veneer lumber and/or laminated veneer board for outdoor usage
JP2018051837A (ja) * 2016-09-27 2018-04-05 パナソニックＩｐマネジメント株式会社 改質木材の製造方法

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