JP2008272956A - Thin laminated veneer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide extremely thin laminated veneer causing no shape deformation and having flexibility and restoration properties. <P>SOLUTION: The extremely thin laminated veneer 10 is formed by laminating veneers 40 and 40 to both sides of a core material 20 through adhesives 30 and 30 and applying a coating surface 50 for preventing the penetration of humidity moisture in the atmosphere to the surfaces of the veneers 40 and 40. Japanese paper or nonwoven fabric is used as the core material 20, has a weight basis of 30-200 g/m<SP>2</SP>and a natural fiber is preferably contained in a part or the whole of it. The adhesives 30 and 30 are applied to both sides of the core material 20 in an amount of 10-500 g/m<SP>2</SP>in a form having meshes, fine mesh-like or opening holes. Then, the veneers 40 and 40 with a thickness of 0.1-2.0 mm are superposed one upon another and compressed under heating for the purpose of the moisture evaporation of the veneers, the melting of the adhesives, the shielding and close adhesion due to the adhesive melting surfaces and the shape memory of the veneers. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to an extremely thin laminated single plate in which single plates are laminated.

Conventionally, there are the following prior patent documents relating to a laminated structure of single plates that are likely to undergo shape deformation such as warping and twisting.
In Patent Document 1, a nonwoven fabric layer is bonded and formed on the back surface of a thin plate (single plate) to form a wood sheet, and the wood sheet is adhered to the surface of a transparent plastic plate.
Patent Document 2 discloses that a molded member is formed by stacking a plurality of front and back single plates in an overlapped state with an adhesive on a core plate dried to a predetermined moisture content or less, and laminating on a mountain-shaped molded member and cold-pressing. A large number of plywoods having convex warpage along the upper surface shape of the plate are formed, the plywood is inserted into a hot press and pressed into a flat plywood, and the warping is reduced by the restoring force after pressing. The floor board plywood is obtained, and when the decorative raw veneer is bonded to the surface of the floor board plywood, the warp of the floor board plywood is offset by shrinkage when the decorative raw veneer is dried It is.
In Patent Document 3, in a tray having a bottom wall and a peripheral wall extending across the bottom wall, the tray is made of a plurality of thin plate-like materials, and directions showing the same properties of these materials intersect each other. It is constructed by pasting together.
Patent Document 4 discloses that a wooden material is formed by press-fitting a pressurized gas that does not add water vapor such as air, nitrogen gas, and carbon dioxide into a sealed space where the wooden material is heated and pressurized to pressurize the sealed space to a predetermined pressure. Is permanently fixed.

JP 2002-144383 A Japanese Patent Laid-Open No. 08-132402 JP 09-169328 A Japanese Patent No. 3002197

However, the prior patent documents have the following problems.
(1) Patent Document 1 is combined with a thick non-deformable material (transparent plastic plate material) in order to prevent shape deformation of a single plate, and is not a combination of a single plate and a core material alone.
(2) Japanese Patent Application Laid-Open No. 2004-228561 is a technique that can be applied to a thick plywood for a floor board by compressing the plywood and reducing the warp by the restoring force after the pressing. It is not a technology that can be used for boards.
(3) Although patent document 3 is what makes the single board which shows the same property cross | intersect and cancels a curvature, it does not prevent the shape deformation of the single board itself.
(4) In Patent Document 4, a sealed space is prepared in a processing process of a wood material, and permanent fixation is achieved without giving moisture to the wood material by heating and pressurizing in the sealed space. Compared to the processing in a harsh environment, the burden of facilities and work is greater.

  With respect to these prior patent documents, the present invention aims to provide an ultra-thin laminated single plate having no shape deformation and having flexibility and resilience. It came to be completed.

To achieve the above object, a first aspect of the present invention, the basis weight a (basis weight) of ^{30g / m 2 ~200g / m 2} , natural fibers or synthetic fibers part or all for absorbing moisture Using the Japanese paper or non-woven fabric contained, after applying 10 g / m ^{2 to} 500 g / m ² of adhesive on both sides of the Japanese paper or non-woven fabric in a mesh or fine mesh shape or a form having an aperture, the thickness is 0.1 mm. 〜2.0mm single plate is stacked and heat-compressed for the purpose of single plate moisture evaporation, adhesive fusion, shielding / adhesion by adhesive melt surface, shape memory of single plate, total with flexibility and resilience A thin laminated single plate having a smooth or two-dimensional or three-dimensional shape with a thickness of 0.2 mm to 5 mm.
Here, “natural fiber” refers to cocoon, cocoon, and cellulose, and “artificial fiber” refers to rayon.
As the “adhesive”, for example, a hot-melt resin, a vinyl acetate resin, or a rubber-based adhesive may be used as a thermoplastic adhesive. However, it is not restricted to these.
Further, the form of the “adhesive” may be an emulsion type, solvent type, mesh sheet type adhesive or the like.
In order to make flame retardant or non-combustible products, “single plate” can be made by impregnating a single plate with a flame retardant or flame retardant, but an oil-based flame retardant or flame retardant is added to the coating material. It can also be applied.
“Two-dimensional shape” means a curved shape that can show a cross-sectional shape by X-axis / Y-axis, and “three-dimensional shape” means a cross-sectional shape by X-axis / Y-axis / Z-axis This means a propeller shape that can be used.
The second invention uses the same or any combination of sliced veneers without selecting veneer material, thickness, wood cut direction, cutting method, compressed veneer or artificial veneer. Is a thin laminated single plate characterized by
Here, “materials of veneer” include ebony, rosewood, persimmon, persimmon, planting, paulownia, persimmon, cedar, pine, walnut, cherry, beech, oak, birch, walnut, balsa, etc. The material of various materials can be used without being limited to. Similarly, the “thickness of wood” is not particularly limited, and various thicknesses can be used.
The "cutting direction of the wood" includes glazed and regular eyes (thawed so that it is almost perpendicular to the annual ring from the bark to the center, and has a grain that passes straight vertically), planks (in the annual ring from the bark to the bark) Timbers that are timbered and have a grain shape and corrugated grain), and annual rings (those that are sawn from wood and have grain of annual rings).
The single plate by the “cutting method” includes a rotary single plate (single plate sliced by a machine called rotary lace), a sliced single plate (also called a attached plate, processed by a machine called a slicer), a half rotary single plate ( This is an intermediate process of the former two, and is used for processing of precious wood.
According to a third aspect of the present invention, a heating mold set at a temperature of 100 ° C. to 120 ° C. is compressed at 10 MPa or less, preferably 5 MPa or less, and moisture in a single plate plant cell in contact with the heating mold is reduced from 5 seconds. Heating for 15 seconds evaporates the water on the veneer, passes through the gap between the adhesive layers applied to the Japanese paper or non-woven fabric, absorbs the water vapor on the veneer on the Japanese paper or non-woven fabric that is dried at a lower temperature than the veneer, and A thin laminated veneer characterized by removing moisture in plant cells and preventing the deformation of the veneer.
The invention prevents the penetration of moisture in the composition into the veneer that occurs when the adhesive having moisture in the composition adheres to the non-dried vinyl acetate resin applied to Japanese paper or nonwoven fabric. At the same time, moisture remaining on the veneer can be removed by evaporation (to be ensured by the combined use with the fourth invention).
Here, “single-plate plant cells” refer to large-diameter pipes, wood fibers, small-diameter pipes, axially soft tissues, and the like.
4th invention is the adhesive melt | dissolved in the metal mold | die high temperature environment by making thickness of Japanese paper or a nonwoven fabric into 0.05 mm-1.2 mm in order to make an adhesive osmose | permeate in the plant cell of a board | plate. Is a thin laminated veneer characterized in that it prevents excessive penetration of Japanese paper or nonwoven fabric and is formed by stress-penetrating the adhesive into the broken plant cells of the veneer during high pressure compression of the mold .
The fifth invention pre-presses the mold pressure from 90% to 99.5%, transfers the shape and heat of the mold to the veneer, and removes moisture from the veneer while reducing the heat of the veneer. By transferring the heat of the mold to the adhesive with a time difference using conductivity, at a stage where the adhesive is melted, pressing at a pressure that does not destroy the wood cells or at 100% pressure at which the wood cells are restored after compression, The air remaining in the cells of the veneer is pushed out by a momentary press, and if necessary, the pressure of the mold is returned again from 90% to 99.5%, so that the adhesive melted by the veneer plant cell restoring force is planted. A thin laminated veneer characterized by being formed by cooling by sucking and penetrating into cells.
According to a sixth aspect of the present invention, the adhesive that has penetrated into the plant cell is cooled at room temperature (at atmospheric temperature or lower) for 10 seconds with the upper and lower molds in a state of continuing the pressurization, and the molten adhesive is placed outside the cell and inside the plant cell. It is a thin laminated single plate characterized by solidifying and maintaining a smooth or two-dimensional or three-dimensional shape.
In the seventh invention, the mouth including the front and back surfaces and the laminated surface of a thin single plate that is press-molded into a smooth or two-dimensional or three-dimensional shape is processed to a coating film thickness of 20 μm to 80 μm in the atmosphere. A thin laminated veneer characterized by preventing moisture and moisture from entering.
Examples of the paint constituting the coating film applied to the surface of the veneer include beeswax and lacquer. In addition, nitrocellulose paint, alkyd resin paint, amino alkyd resin paint, acrylic resin paint, amino acrylic resin paint, vinyl resin paint, enamel paint, epoxy paint, urethane paint, oil-based Paints, oil varnishes, resin varnishes, polyurethane resin paints, polyester resin paints, chlorinated rubber paints, silicone resin paints, phthalic acetate resin paints, ash paints, fluororesin paints, etc. It is not limited to.

According to the said invention, it has the following effects.
(1) Total thickness of 0.2 mm to 5 mm, no thin deformation, smoothness (flat plate), two-dimensional (curved shape) or three-dimensional shape (curved + twisted shape) having flexibility and flexibility ) Can be provided.
(2) Since the warping and twisting of the single plate is prevented in the laminated structure / lamination method regardless of the material of the single plate or the cutting method, the single plate can be used without selecting it.
(3) Since the residual moisture of the veneer can be efficiently absorbed by the Japanese paper or the nonwoven fabric during the laminating process, shape stability (prevention of warpage and twist) is given to the veneer.
(4) Adhesive can be penetrated into single plate and core material (Japanese paper or non-woven fabric) reliably, evenly and three-dimensionally. As a result, not only adhesive performance but also shape stability (preventing warpage and twisting) in laminated single plate. ) And flexible and flexible.

Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an explanatory cutaway view showing the structure of a thin laminated single plate according to the present invention.
As shown in FIG. 1, a thin laminated veneer 10 is bonded to both sides of a core material 20 via adhesives 30, 30, and prevents moisture and moisture from entering the atmosphere on the surface. A painted surface 50 is applied.

The core material 20 uses a Japanese paper or nonwoven fabric having a basis weight (basis weight) of a ^{30g / m 2 ~200g / m 2} , she is preferable that natural fiber having a water absorbing property is included in some or all.
The adhesive 30, 30 applied to both sides of the core material 20 is applied to form a mesh or fine mesh-like or open hole in an amount of ^{10g / m 2 ~500g / m 2} .
Then, the single plates 40 and 40 having a thickness of 0.1 mm to 2.0 mm are stacked and heat-compressed for the purpose of single plate moisture evaporation, adhesive melting, shielding / adhesion by the adhesive melting surface, and shape memory of the single plate.
By adopting such an ultra-thin laminated structure with a total thickness of 0.2 mm to 5 mm, there is no deformation such as warping or twisting, and it has a smooth or two-dimensional or three-dimensional shape having flexibility and resilience. A thin laminated veneer can be provided.
Hereinafter, the reason will be described in detail based on the work process diagram.

FIG. 2 is an operation process diagram showing an operation process of the thin laminated veneer 10 according to the present invention.
First, a portion related to “moisture evaporation” in the work process shown in FIG. 2 will be described.
FIGS. 3-6 is an image figure which shows the non-pressurization state, pressurization state initial stage, middle period, and late stage in order, and shows the mechanism of the water evaporation from the single plate 40 at the time of pressure compression.
When the single plates 40 and 40 are stacked on both surfaces of the core member 20 as shown in FIG. 3 (non-pressurized state) and heated and compressed from above and below by the molds 60 and 60, as shown in FIG. At the same time, the moisture 41 in the veneer 40 starts to evaporate. At this time, since the adhesive 30 interposed between the veneer 40 and the core material 20 is applied in a mesh or fine mesh shape or a form having an opening hole, the moisture 41 is as shown in FIG. Then, it passes through the gap between the adhesive layers and is absorbed by the core material 20. In this way, the moisture 41 in the single plate 40 is reliably removed, and the deformation of the single plate 40 is prevented from occurring. Here, when the moisture 41 passes through the adhesive layer, not only the natural passage through the gap of the adhesive layer but also a pinhole-like gap may be formed in the dissolved adhesive layer due to the pressure of evaporation of the moisture and crushed and ejected. .
In addition, in order to evaporate the water | moisture content 41 in the single plate 40, it is preferable to set the temperature of a heating-type metal mold to 100 to 120 degreeC, and to compress at 10 Mpa or less.

Further, as shown in FIG. 6 (late stage of the pressurization state), after the single plate 40 is heated and compressed, the adhesive 30 spreads evenly and securely bonds the core material 20 and the single plate 40.
As shown in the graph of FIG. 7, the temperature rise of the veneer 40 and the temperature rise of the adhesive 30 are shifted due to the heat insulating action of the plant cells of the veneer. Since the temperature rise of the adhesive 30 is delayed, the moisture 41 from the veneer 40 evaporates faster than the adhesive 30 is dissolved, and the core material 20 can absorb the moisture 41 through the gaps in the adhesive layer. Become. On the contrary, after the heat compression, the adhesive 30 spreads evenly, so that the movement of moisture from the core material 20 to the single plate 40 is prevented by the adhesive layer.

Such a technique for evaporating (removing) the moisture 41 from the veneer 40 is based on an extremely clever structure that uses the temperature increase between the veneer 40 and the adhesive 30.
In addition, as is often seen in conventional techniques, a single plate that has been dried in advance is often used in order to prevent deformation of the single plate. However, even if it is a dried veneer, when it is stored in a general indoor environment, it may absorb moisture in the atmosphere and may be deformed in some cases. Therefore, the water removal method according to the present invention is extremely effective for the purpose of maintaining the uniformity of the product.

Next, a portion related to “additional pressure (heating)” (during a two-stage shot) in the work process shown in FIG. 2 will be described.
FIG. 8 is an image diagram showing an additional compression state at the time of two-stage shot.
That is, in the first stage, the pressure of the mold 60 is pre-pressed at 90% to 99.5%, and the shape and heat of the mold 60 are transmitted to the veneer 40 and the moisture 41 of the veneer 40 is removed. The heat of the mold 60 is transferred to the adhesive 30 with a time difference by utilizing the low thermal conductivity of the single plate.
In the second stage, when the adhesive 30 is melted, by pressing at a pressure that does not destroy the wood cells, or at 100% pressure at which the wood cells are restored after compression (at the time of the two-stage shot), as shown in FIG. Then, air (residual air) 42 remaining in the cells of the veneer 40 is pushed out by a momentary press, and if necessary, the pressure of the mold 60 is again returned from 90% to 99.5% (see “Addition” in FIG. 2). Pressure release "), the adhesive 30 melted by the plant cell restoring force of the veneer 40 is sucked into the plant cells and penetrated.
Reference numeral 61 denotes a heater for heating provided in the mold 60, and reference numeral 62 denotes a water-cooled tube for cooling.

FIG. 9 is an image diagram showing a penetration state of the adhesive 30 into the plant cells.
As shown in FIG. 9, since the adhesive 30 surely penetrates the plant cells of the veneer 40, the adhesion between the core material 20 and the veneer 40 is made strong. In the first place, unless the adhesive 30 penetrates both the core material 20 and the single plate 40, high adhesiveness and excellent flexibility / restorability effects cannot be expected. Even if it is highly possible that most of the adhesive melted depending on the thickness or material of the core material 20 penetrates into the core material 20, according to this method, the adhesive 30 is bonded between the core material 20 and the veneer 40. It is possible to penetrate both.

FIG. 8 is a graph showing a deformation state in the lamination process section of the single plate 40.
The lamination process division of the single plate 40 corresponds to * 1 to * 4 in the work process diagram shown in FIG.
According to the graph shown in FIG. 8, * 1 (single plate only), * 2 (at the end of lamination bonding), * 3 (at the end of cooling and solidification), * 4 (at the end of moisture-proof coating), alone or continuously. It can be seen that the veneer 40 is greatly deformed when the above is performed. On the other hand, when the above steps are all or selectively performed continuously or within 3 hours, the veneer 40 is not deformed.
Here, when the pre-dried veneer is continuously used, it is possible to proceed to the subsequent process without using the moisture evaporation process (work process diagram / D).
However, if the pre-dried veneer is stored in a non-humidity controlled environment, or if cutting, slitting, and punching processes are added, the moisture in the atmosphere is higher or higher than the dry state of the veneer cells. In a short time, moisture and moisture in the air is absorbed into the veneer cells from the cut end or cut surface, and re-pre-drying or drying in the subsequent process is required. Not suitable for mass production.
Further, in order to finish the production process within a short time, the shape must be stored in the laminated single plate while being compressed into a mold. Further, if the moisture-proof treatment is not performed, the shape is deformed.
Note that (* 3) in the deformed state in the process section is not suitable for mass production because it takes time to dry the adhesive in the case of non-cooling.

  The present invention relates to an ultra-thin laminated veneer, which includes blinds, cards / non-shrinkable deformed IC cards utilizing wood grain, fence partition plates, electric fan propellers, home appliance exterior parts, light bulb cover shades It can be used for a wide range of applications such as spoons, spatulas, book covers, helmets for hats, megaphones, etc.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. The work process figure which shows the work process of the thin laminated single plate which concerns on this invention. Explanatory drawing of the non-pressurization state of the laminated single board in a work process. Explanatory drawing of the pressurization state initial stage of the laminated single board in a work process. Explanatory drawing of the pressurization state middle period of the laminated single board in a work process. Explanatory drawing of the latter half of the pressurization state of the laminated single board in a work process. The graph which shows the relationship between a metal mold | die pressure, a single plate temperature, and adhesive agent temperature. The image figure which shows the additional compression state at the time of a two step shot. The image figure which shows the osmosis | permeation state to the plant cell of an adhesive agent. The graph which shows the deformation | transformation state in the lamination process division of a single plate.

Explanation of symbols

10 Ultra-thin laminated veneer 20 Core material (Japanese paper or non-woven fabric)
30 Adhesive 40 Single plate 41 Moisture 42 Residual air 50 Paint surface 60 Mold 61 Heater 62 Water-cooled tube

Claims (7)

Basis weight and (basis weight) of a ^{30g / m 2 ~200g / m 2} , using a paper or non-woven natural fibers or artificial fibers for absorbing moisture contained in part or all,
After application to both surfaces of the paper or nonwoven fabric adhesive 10g / m ² ~500g / m ² to form a mesh or fine mesh-like or open hole,
A single plate having a thickness of 0.1 mm to 2.0 mm is stacked and heated and compressed for the purpose of single plate moisture evaporation, adhesive melting, shielding by the adhesive melt surface, adhesion, and shape memory of the single plate, A thin laminated single plate having a smooth or two-dimensional or three-dimensional shape with a total thickness of 0.2 mm to 5 mm having a restoring property.   The thin laminate according to claim 1, wherein the sliced veneers are used in the same kind or in any combination without selecting a veneer material, thickness, wood cut direction, cutting method, compressed veneer or artificial veneer. Single plate. The heating mold set at a temperature of 100 ° C. to 120 ° C. or less is compressed at 10 MPa or less, and the moisture in the veneer plant cells in contact with the heating mold is heated for 5 seconds to 15 seconds, so that the moisture on the veneer is reduced. Evaporate
3. The prevention of the occurrence of deformation of the veneer by absorbing the veneer moisture from the veneer to the washi paper or the nonwoven fabric which is dried at a lower temperature than the veneer through a gap between the adhesive layers applied to the washer or nonwoven fabric. Thin laminated veneer.   In order to allow the adhesive to penetrate into the veneer plant cells, the thickness of the Japanese paper or non-woven fabric is set to 0.05 mm to 1.2 mm, so that the adhesive melted in the mold high temperature environment can be applied to the Japanese paper or non-woven fabric. The thin laminated veneer according to any one of claims 1 to 3, wherein the thin laminated veneer is formed by preventing excessive penetration and stress-penetrating an adhesive into a plant cell in which the veneer is broken during high-pressure compression of a mold.   Pre-pressing the mold pressure from 90% to 99.5%, transferring the shape and heat of the mold to the veneer, and taking advantage of the low thermal conductivity of the veneer while removing moisture from the veneer The heat of the mold is transferred to the adhesive with a time lag, and when the adhesive melts, the pressure that does not destroy the wood cells is pressed. The remaining air is pushed out by a momentary press, and the pressure of the mold is restored again from 90% to 99.5% as necessary, and the adhesive melted by the veneer plant cell restoring force is sucked into the plant cells. The thin laminated veneer according to any one of claims 1 to 4, wherein the thin laminated veneer is cooled by penetration.   The adhesive that has penetrated into the plant cells is cooled for 10 seconds with the upper and lower molds at room temperature (below the ambient temperature) while the pressure continues, and the melted adhesive is solidified outside the cells and inside the plant cells to be smooth or double. The thin laminated single plate according to any one of claims 1 to 5, wherein a three-dimensional shape is maintained.   Prevents moisture and moisture from entering the atmosphere by treating the lip including the front and back surfaces and laminated surfaces of thin single plates that have been pressed into a smooth or two-dimensional or three-dimensional shape to a coating thickness of 20 to 80 μm. The thin laminated single plate according to any one of claims 1 to 6.

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