JP3786083B2 - Veneer sheet - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a veneer sheet used for interiors of buildings such as houses and vehicles.
[0002]
[Prior art]
Conventionally, natural wood-based decorative materials such as solid wood veneer and veneer plywood that are used as interior materials for buildings and vehicles are natural materials, so they are weatherproof, stain resistant, and wear resistant. Therefore, it has been compensated for by coating the surface with a synthetic resin paint or the like.
[0003]
However, the painting work involves many man-hours such as application of sanding sealer, polishing, undercoating, intermediate coating, and finish coating, which are complicated and costly. In addition, there are problems in occupational health due to evaporation of the solvent contained in the coating.
[0004]
In addition, when a paint containing a solvent is exposed to a high temperature so as to be dried at a high speed, defects such as warping and cracking of the base material are likely to occur, and thus drying at a relatively low temperature for a long time is required. For this reason, the line length of the painting equipment is inevitably long, and it must be a large equipment requiring a large installation area, and the production efficiency is low because the speed does not increase.
[0005]
In order to alleviate this problem, the sheet-like veneer is laminated with a reinforcing non-woven fabric or Japanese paper or other fibrous sheet on the back of the veneer, instead of coating the solid veneer or veneer plywood. The method of sticking this on the surface of plywood etc. is prepared by giving a veneer sheet.
[0006]
According to this method, since the laminate of the veneer and the fibrous sheet is a long continuous sheet that is rich in flexibility, unlike the plywood, the laminate to the veneer that is a discontinuous hard plate is obtained. Compared with painting, painting and drying can be done with simple equipment with a smaller installation area, and since the heat capacity is much less, the time required for drying is greatly shortened and efficient painting work is possible. It is.
[0007]
However, even with this method, in terms of painting on wood, which is a natural material, it can be used between individual woods, or between spring and autumn woods in a single wood. Due to the difference in the density of the wood structure, the degree of penetration of the paint varies, so the finish state such as the coating film thickness and surface gloss tends to vary, and it is difficult to stably supply products of uniform quality.
[0008]
Furthermore, because the veneer is a natural material, it is difficult to stably supply a product of uniform quality even in terms of design due to its color tone and grain shape. Among these, the color tone can be adjusted to some extent by coloring the paint, but the shape of the wood having a large influence on the design cannot be handled only by painting.
[0009]
Regarding this, wood grain printing on the veneer surface is also conceivable, but problems such as printing omissions easily occurring due to surface irregularities and printing ink soaking unevenness due to differences in the density of the wood structure are likely to occur. Is not practical.
[0010]
Therefore, a method of sticking a transparent or translucent synthetic resin film preliminarily printed with a transparent grain pattern on the surface of the protruding plate has been proposed and has already been widely put into practical use (see Patent Documents 1 and 2).
[0011]
By sticking a synthetic resin film to the veneer in this way, the veneer can be protected from breakage or breakage when the veneer sheet is bent. Therefore, bending (V-cut) or wrapping (wrapping) There is also an advantage that processing is possible (see Patent Documents 3 and 4).
[0012]
However, even if the synthetic resin film is stuck on the surface of the veneer as described above, it cannot be said that the problem of insufficient weather resistance of the veneer has been sufficiently solved. In other words, since the veneer is a natural woody material, if it has been used for many years, it tends to cause burns (discoloration) and corrosion, and the design is impaired.
[0013]
In particular, in areas around water and in areas where condensation may occur, such as window frames, moisture can be passed through a fibrous layer such as Japanese paper or non-woven fabric laminated on the back side of the veneer or a wooden substrate. Problems such as waving, peeling, and corrosion of the veneer due to penetration of (water vapor) into the veneer are significant.
[0014]
There is also a proposal of a veneer sheet having a configuration in which the front and back of the veneer are sandwiched between waterproof and moisture-proof thermoplastic resin films (see Patent Documents 5 to 7).
[0015]
However, even if the effect of water vapor is eliminated by the above method, some degree of improvement can be seen in the burnt of the veneer, but it is difficult to sufficiently suppress it to a level that does not impede practical use even if it is used for a long time. there were. This is probably because the veneer causes discoloration due to the action of oxygen and ultraviolet rays in addition to moisture.
[0016]
[Patent Document 1]
JP 63-134238 A [Patent Document 2]
Microfilm of Japanese Utility Model Application No. 61-18579 (Japanese Utility Model Application No. 63-93132) [Patent Document 3]
JP-A-3-87251 [Patent Document 4]
JP-A-9-136385 [Patent Document 5]
Japanese Patent Publication No. 37-10934 [Patent Document 6]
Japanese Patent Application No. 3-10776 (Japanese Utility Model Application Publication No. 4-100843)
Japanese Patent Laid-Open No. 6-91834
[Problems to be solved by the invention]
The present invention has been made to solve the above-described problems in the prior art, and by suppressing the influence of oxygen and water vapor that cause discoloration, the present invention can be used for a long time without causing significant discoloration. A veneer sheet that can be used is provided.
[0018]
[Means for Solving the Problems]
The veneer sheet of the present invention is a veneer sheet formed by coating the front and back of a veneer with a gas barrier layer having an oxygen permeability of 100 cm ³ / m ² · 24 hr · atm or less and a moisture permeability of 10 g / m ² · 24 hr or less. The gas barrier layer on the front surface side is transparent or translucent, and is transparently colored or patterned, and the gas barrier layer on the back surface side is a metal foil or a synthetic thin film layer formed on at least one side. A veneer sheet characterized by being a resin film .
[0019]
The gas barrier layer on the surface side is a synthetic resin film having an inorganic thin film layer formed on at least one side .
[0026]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a veneer sheet according to the present invention will be described below with reference to the drawings.
[0027]
FIG. 1 is a side sectional view showing a structural example of a veneer sheet according to the present invention.
[0028]
This veneer sheet is constructed by laminating the veneer plate 2 on the backside gas barrier layer 3 via the adhesive layer 42 and laminating the surface gas barrier layer 1 on the adhesive layer 41 thereon. Furthermore, the adhesive layer 5 for sticking this veneer sheet | seat to various to-be-adhered base materials is formed in the back surface of the back surface gas barrier layer 3. FIG.
[0029]
The veneer 2 is a thin plate obtained by slicing natural wood thinly as is conventionally known, and usually refers to a plate having a thickness of 3 mm or less. However, the workability and corners at the time of application to an adherend substrate as a veneer sheet are known. Thin ones are preferable in terms of the ability to follow parts, curved surfaces, etc. In particular, considering incombustibility and flame retardancy as a building material, those having a thickness of about 150 to 200 μm are used due to the problem of heat during combustion. It is preferable.
[0030]
As the backside gas barrier layer 3 and the surface gas barrier layer 1, an oxygen barrier material and a water vapor barrier material are used. Regarding the degree of oxygen barrier property and water vapor barrier property, according to the experiments by the present inventors, the oxygen permeability is 100 cm ³ / m ² · 24 hr · atm (JIS Z 0208, cup method, 40 ° C., 90% RH). The moisture permeability is preferably 10 g / m ² · 24 hr (JIS K 7126, Method B, 25 ° C., 80% RH) or less.
[0031]
The surface gas barrier layer 1 uses a transparent or translucent layer in order to make use of the design feeling of the protruding plate 2. As such a transparent or translucent gas barrier layer, a transparent or translucent synthetic resin film similar to the transparent gas barrier film generally used for food packaging is used. can do.
[0032]
Of course, the transparent gas barrier film may be a single layer film made of a single type of synthetic resin, as long as the oxygen permeability and moisture permeability are within the specified ranges of the present invention. In reality, an appropriate material for this is not known, and therefore, it is generally a laminated body composed of a plurality of materials.
[0033]
Specifically, for example, an inorganic thin film layer 12 such as silicon oxide, aluminum oxide, magnesium oxide, zirconium oxide or the like is applied to one or both surfaces of a normal synthetic resin film 11 such as a polyethylene terephthalate film or a polypropylene film by vacuum deposition or Oxygen permeability is low in moisture permeability, such as inorganic vapor-deposited film (so-called ceramic vapor-deposited film) formed by sputtering or the like to give oxygen barrier properties and water vapor barrier properties, such as polypropylene and polyvinylidene chloride. Is a high synthetic resin film (water vapor blocking synthetic resin layer 111) and a synthetic resin film (oxygen blocking synthetic resin) having a low oxygen permeability but a high moisture permeability, such as polyvinyl alcohol and ethylene-vinyl alcohol copolymer. Laminate with layer 112) Such as Tofirumu is used.
[0034]
In order to prevent the increase in oxygen permeability due to the moisture absorption of the oxygen-blocking synthetic resin layer 112, the latter laminate film has a water vapor-blocking synthetic surface on both sides of the oxygen-blocking synthetic resin layer 112 as shown in FIG. In general, the resin layer 111 is sandwiched.
[0035]
Comparing the above-mentioned inorganic vapor deposition film and laminate film, the latter laminate film needs to gain oxygen barrier properties and water vapor barrier properties depending on the thickness of the synthetic resin layer, so it is thicker to obtain sufficient performance. The former inorganic vapor-deposited film has an extremely thin inorganic thin film layer with a thickness of about several hundred to several thousand nm, but has sufficient gas (oxygen and water vapor). ) Since the barrier property is expressed, the gas barrier layer can be made thin as a whole, and there is an advantage that it is excellent in transparency.
[0036]
In consideration of transparency, printability, processability, durability, price, etc., this inorganic vapor deposition film is most preferably an inorganic vapor deposition polyethylene terephthalate film, and its thickness is about 8-12 μm, and sufficient performance can be obtained. .
[0037]
In addition, when using what the inorganic thin film layer 12 was provided in only one side of the synthetic resin film 11 as said inorganic vapor deposition film, use the inorganic thin film layer 12 toward the surface (opposite side to the protrusion board 2 side). It is also possible to do.
[0038]
However, when the inorganic thin film layer 12 is partially damaged due to wear or scratches on the surface during use of a building material or the like with the veneer sheet adhered to the surface, oxygen or water vapor enters from the damaged portion, and the veneer In order to prevent this, as shown in FIG. 1, it is preferable to use the inorganic thin film layer 12 bonded to the protruding plate 2 side.
[0039]
If necessary, an ultraviolet absorber or a light stabilizer is added to the synthetic resin film 11 in the surface gas barrier layer 1 to prevent deterioration of the synthetic resin film 11 due to the action of ultraviolet rays. It is also effective in suppressing the burn of the protruding plate 2 due to the action.
[0040]
The surface gas barrier layer 1 is made up of an artificial wood pattern by printing or the like while making use of the design and texture of the laminated veneer 2 to homogenize the natural wood grain variation and / or For the purpose of homogenizing the color variation of natural wood by uniformly coloring, a transparent pattern layer 13 (including the case of a plain colored layer, the same applies hereinafter) is provided on one or both sides thereof. Can do.
[0041]
In addition, when aiming at coloring without a pattern, it is good also as a transparent or translucent colored film by knead | mixing a coloring agent in the synthetic resin film 11 used for the surface gas interruption | blocking layer 1. FIG. It is of course possible to use the coloring of the synthetic resin film 11 by this method together with the pattern layer 13 by printing or the like.
[0042]
The transparent pattern layer 13 may use a transparent or translucent printing ink using a highly transparent dye or pigment, or may use a printing ink that is low in transparency or substantially opaque. Even if it prints in the shape of a halftone dot with many omissions, it is possible to maintain the transparency that can substantially see through the protruding plate 2.
[0043]
The surface gas barrier layer 1 has a transparent or translucent surface for imparting surface properties such as surface hardness, abrasion resistance, scratch resistance, solvent resistance, and contamination resistance, if necessary. A protective layer can also be provided.
[0044]
For the surface protective layer, a cross-linking curable resin such as a two-component curable urethane resin or an ionizing radiation curable resin is generally used from the viewpoint of physical properties. Further, for example, an ultraviolet absorber, a light stabilizer, a heat stabilizer, a lubricant, an antistatic agent, an anti-condensation agent, an antibacterial agent, an antifungal agent, an anti-friction agent, a colorant, and a filler as needed It is also possible to add additives such as those as long as they are within the range not significantly disturbing the transparency.
[0045]
From the viewpoint of weather resistance, which is the main object of the present invention, the backside gas barrier layer 3 is not particularly troublesome even if it is transparent or translucent like the surface gas barrier layer 1. However, in order to conceal the color and defects of the surface of the substrate to be adhered, which is the object to which the veneer sheet of the present invention is to be adhered, and to stabilize the appearance design after being adhered, it must be opaque. Is preferred.
[0046]
The backside gas barrier layer 3 can be made of the same material as that of the surface gas barrier layer 1 from the viewpoint of gas (oxygen and water vapor) barrier properties. A masking layer made of opaque printing ink or paint is provided on one side or both sides of the same gas barrier layer as in layer 1 or a pigment having high hiding power is kneaded into the synthetic resin film 11 to make the masking opaque. It may be colored.
[0047]
However, in order to provide sufficient concealability without increasing the thickness of the backside gas barrier layer 3 or increasing the number of manufacturing steps, a metal thin film such as aluminum is used instead of the inorganic thin film layer in the inorganic deposited film described above. It is preferable to use a metal vapor-deposited film (FIG. 1) formed by forming the layer 32 on one side or both sides of the synthetic resin film 31, or a metal foil 33 (FIG. 2) such as an aluminum foil.
[0048]
The metal vapor-deposited film is more suitable as a material for the backside gas barrier layer 3 because it has better handleability such as crease resistance and puncture resistance than the metal foil and is available at a lower price than the inorganic vapor-deposited film in the market. It can be said that. The thickness is about 8-12 μm, and sufficient performance can be obtained.
[0049]
When using the metal vapor deposition film having the metal vapor deposition layer 32 provided on only one side of the synthetic resin layer 31, the metal vapor deposition layer 32 may be used facing the back surface (the surface opposite to the protruding plate 2 side). Is possible.
[0050]
However, in order to prevent damage to the metal vapor deposition layer 32 in the manufacturing process of the veneer sheet or in a subsequent process, it is preferable to use the metal vapor deposition layer 32 attached to the protrusion plate 2 side. According to this affixing method, the exposed surface of the back surface of the back gas barrier layer 3 is not a metal vapor-deposited layer 32 that is difficult to adhere, but a general-purpose synthetic resin film 31. There is also an advantage that the range of selection of an adhesive or a pressure-sensitive adhesive is expanded.
[0051]
The adhesive used for the adhesive layer 41 that bonds the surface gas barrier layer 1 and the protruding plate 2 is originally transparent or translucent in order to make use of the design feeling and material feeling of the protruding plate 2, or during the bonding operation. Even if it is opaque, it only needs to be transparent or translucent after curing. For example, vinyl acetate adhesive, urethane adhesive, polyester adhesive, epoxy adhesive, acrylic adhesive, synthetic rubber adhesive Any conventionally known adhesive such as an agent can be used.
[0052]
The adhesive used for the adhesive layer 42 that bonds the backside gas barrier layer 3 and the protruding plate 2 is basically the same as that used for bonding the surface gas blocking layer 1 and the protruding plate 2 described above. It is not limited to transparent or translucent, and may be opaque.
[0053]
In particular, if a color similar to the color of the protruding plate 2 is used, the back gas blocking layer 3 is not sufficiently concealed, or the back gas blocking layer 3 itself is not preferable for backing the protruding plate 2. Even if it has, it can have the function which supplements concealment property by the adhesive bond layer 42, or adjusts a background color, and stabilizes an external appearance design. In this case, the adhesive layer 42 is most effective if it is opaque, but a certain effect can be obtained even if it is translucent.
[0054]
In the protruding plate sheet of the present invention, the configuration of the back surface side of the back gas blocking layer 3 is not limited at all. For example, when the same workability as a conventional veneer sheet with the back surface of the veneer lined with Japanese paper or nonwoven fabric is required, the back surface of the back gas barrier layer 3 may be lined with Japanese paper or non-woven fabric.
[0055]
Moreover, when performing an adhesive process on the back surface of the veneer sheet, the adhesive layer 5 may be formed on the back surface of the back gas barrier layer 3 via an appropriate backing layer, or on the back surface of the back gas barrier layer 3. You may form the adhesive layer 5 directly. As the pressure-sensitive adhesive in this case, conventionally known pressure-sensitive adhesives such as acrylic, synthetic rubber, and silicone can be arbitrarily used.
[0056]
Moreover, you may laminate | stack the release paper or release film in which the release process by the silicone compound etc. was given to the back surface of this adhesive layer 5, and if needed on the surface of the surface gas barrier layer 1 The pressure-sensitive adhesive layer 5 may be wound and used as it is overlaid on the surface gas barrier layer 1 without being subjected to release treatment and laminated with release paper or the like.
[0057]
【Example】
Next, the present invention will be described in more detail with reference to specific examples. In addition, this invention is not limited at all by these examples.
[0058]
Example 1
Transparent ceramic vapor-deposited polyethylene terephthalate film with a thickness of 12 μm (trade name: Ecosial, moisture permeability 1 g / m ² · 24 hr or less, oxygen permeability 1 cm ³ / m ² · 24 hr · atm or less) (ceramic vapor-deposited film) After the primer treatment on the vapor-deposited surface of), a transparent wood grain pattern was printed using a highly transparent printing ink.
[0059]
The printed surface of the printed ceramic vapor-deposited film was bonded to the surface of a 200 μm thick veneer (merapie material) using a transparent polyester adhesive (coating amount after drying 30 g / m ² ).
[0060]
Next, a 12 μm thick aluminum vapor-deposited polyethylene terephthalate film (water vapor permeability 1 g / m ² · 24 hr or less, oxygen permeability 1 cm ³ / m ² · 24 hr · atm or less) (aluminum vapor-deposited film) is deposited on the rear surface of the protruding plate. Then, they were bonded together using a polyester-based adhesive colored in a light brown and opaque color (coating amount after drying 30 g / m ² ).
[0061]
Thereafter, an acrylic pressure-sensitive adhesive was applied to the back surface of the aluminum vapor-deposited film to a thickness of 40 μm after drying to produce a veneer sheet according to the present invention.
[0062]
Example 2
In Example 1, in place of the ceramic vapor-deposited film, a transparent polypropylene resin layer having a thickness of 12.5 μm was laminated on both sides of a transparent ethylene-vinyl acetate copolymer resin layer having a thickness of 25 μm. A co-extrusion biaxially stretched film (water vapor permeability of about 5 g / m ² · 24 hr, oxygen permeability of 1 cm ³ / m ² · 24 hr · atm or less) is used, and the rest is the same as in Example 1 above. Was made.
[0063]
Example 3
In Example 1, an aluminum foil having a thickness of 15 μm (moisture permeability of 1 g / m ² · 24 hr or less, oxygen permeability of 1 cm ³ / m ² · 24 hr · atm or less) was used in place of the aluminum deposited film, and the others were A veneer sheet according to the present invention was produced in the same manner as in Example 1.
[0064]
Example 4
In Example 2 above, an aluminum foil having a thickness of 15 μm (moisture permeability of 1 g / m ² · 24 hr or less, oxygen permeability of 1 cm ³ / m ² · 24 hr · atm or less) was used in place of the aluminum vapor-deposited film. A veneer sheet according to the present invention was produced in the same manner as in Example 2.
[0065]
Comparative Example 1
In Example 1 above, a transparent biaxially stretched polypropylene film having a thickness of 25 μm (moisture permeability of about 5 g / m ² · 24 hr, oxygen permeability of about 1500 cm ³ / m ² · 24 hr · atm) is used instead of the ceramic deposited film. In addition, a veneer sheet was produced in the same manner as in Example 1 above.
[0066]
Comparative Example 2
In Example 1 above, a transparent ethylene-vinyl alcohol copolymer resin film having a thickness of 25 μm (moisture permeability of about 80 g / m ² · 24 hr, oxygen permeability of 1 cm ³ / m ² · 24 hr · atm in place of the ceramic deposited film) In the same manner as in Example 1 above, a veneer sheet was prepared.
[0067]
Comparative Example 3
In Example 1 described above, instead of the aluminum vapor-deposited film, a non-woven fabric with a basis weight of 30 g / m ² (both moisture permeability and oxygen permeability are very large and cannot be measured) is used as an ethylene vinyl acetate adhesive (coating amount after drying: 30 g). / M ² ), and a veneer sheet was prepared in the same manner as in Example 1 above.
[0068]
Comparative Example 4
In Comparative Example 3, a veneer sheet was produced in the same manner as in Comparative Example 3 except that the same polypropylene film as that used in Comparative Example 1 was used instead of the ceramic deposited film.
[0069]
Discoloration resistance test The veneer sheets of Examples 1 to 4 and Comparative Examples 1 to 4 described above were placed in a constant temperature and humidity chamber at 40 ° C. and 90% RH, and after 500 hours, the same sheets as those at 20 ° C. and 30% were obtained. When compared with a reference sample stored in the dark place of RH (visual observation from the surface, that is, the non-adhesive surface), no color change was observed in the veneer sheets of Examples 1 to 4, whereas Comparative Example The veneer sheets of Nos. 1, 2 and 4 were remarkably discolored, and moderate discoloration was observed on the veneer sheet of Comparative Example 3.
[0070]
【The invention's effect】
As described above in detail, the veneer sheet according to the present invention is formed by covering the front and back surfaces of the veneer with an oxygen-blocking and water-vapor-blocking gas barrier layer, so that oxygen and Since it prevents water from entering the veneer from outside air, it is less likely to cause discoloration or corrosion even when used for a long time compared to conventional veneer sheets, and it has a beautiful design that makes use of the veneer's texture. Can be maintained for a long time.
[0071]
Furthermore, by providing a sheet layer such as a synthetic resin film or metal foil on both sides of the veneer, cracking, peeling, scratching, etc. of the veneer during processing are prevented, and processing suitability and ease of handling increase. Phenomenon such as floating or swelling due to expansion / contraction of the veneer after sticking to the substrate to be bonded, see-through or push-up of the butted portion, etc. due to the loss of expansion / contraction of the veneer due to the movement of moisture between the veneer and the outside There are side effects such as being able to prevent.
[Brief description of the drawings]
FIG. 1 is a side sectional view showing an embodiment of a veneer sheet according to the present invention.
FIG. 2 is a side sectional view showing an embodiment of a veneer sheet according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Surface gas barrier layer 11 Synthetic resin film 111 Water vapor barrier synthetic resin layer 112 Oxygen barrier synthetic resin layer 12 Inorganic thin film layer 13 Picture layer 2 Veneer board 3 Back surface gas barrier layer 31 Synthetic resin film 32 Metal thin film layer 33 Metal foil 41 Adhesion Adhesive layer 42 Adhesive layer 5 Adhesive layer

Claims (2)

A veneer sheet in which the front and back surfaces of a veneer are covered with a gas barrier layer having an oxygen permeability of 100 cm ³ / m ² · 24 hr · atm or less and a moisture permeability of 10 g / m ² · 24 hr or less, The barrier layer is transparent or translucent, and is provided with a transparent coloring or pattern, and the gas barrier layer on the back side is a metal foil or a synthetic resin film having a metal thin film layer formed on at least one side. Characteristic veneer sheet. The veneer sheet according to claim 1, wherein the gas barrier layer on the surface side is a synthetic resin film having an inorganic thin film layer formed on at least one surface .

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