JPH02289342A - Fancy plywood having three-dimensional shape - Google Patents

Abstract

PURPOSE:To prevent warpage or deformation generated by a change of temp. and humidity, in fancy plywood having a three-dimensional shape constituted by bonding a surface member and a backing member to both front and rear surfaces of a metal panel, by making the thicknesses of the wooden parts of both of the surface member and the backing member almost same. CONSTITUTION:A surface member 1 is a laminated member wherein sliced veneer 1 of natural wood having a beautiful grain and excellent design effect, a resin impregnated sheet 12 composed of a polyester nonwoven fabric and wooden veneer 13 are successively arranged so that the sliced veneer 11 is positioned on the surface side. Natural woods are laminated so that the grain directions thereof cross each other at a right angle and mutually negated in the directionality marked in a coefficient of expansion possessed thereby. A backing member 3 is formed so as to have the same number and almost same thickness as the wooden part constituting the surface member. Fancy plywood is two-dimensionally subjected to press bending processing using an appropriate mold, for example, a cast female mold 5 and a cast male mold 6. The surface member 1 bonded and integrated preliminarily is laminated through an adhesive 4 so as to bring the surface of the wooden veneer 13 to a contact state to be inserted between the molds 5, 6. Then, a metal panel 2, the surface member 1 and the backing member 3 are pressed under the appropriate pressure corresponding to the thicknesses and material qualities thereof.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to decorative plywood having a three-dimensional shape.

[Conventional technology]

In recent years, there has been an increase in the use of decorative plywood, which uses natural wood with a beautiful grain for the interior materials of instrument panels, storage boxes, etc., mainly in luxury passenger cars. However, since natural wood is easy to break and tends to return to its original shape when deformed within the limit of cracking, it is difficult to bend into a desired shape. For example, it is bonded to an aluminum plate or the like, bent into a desired shape, and maintained in that shape.

[Problem to be solved by the invention]

However, decorative plywood, in which a facing material made of natural wood is glued to one side of a metal plate, warps or deforms due to changes in temperature and humidity due to the difference in thermal expansion coefficient between the wooden part of the facing material and the metal plate. There was an inconvenience. In other words, as is well known, cars are sometimes used in regions as cold as -30 degrees Celsius, and it is not uncommon for cars to be left in the hot sun in midsummer and the temperature inside the car can rise to around 80 degrees Celsius. The changes are also extremely large. For this reason, conventional decorative plywood, which is made by bonding a facing member made of natural wood and a metal plate, not only warps and deforms repeatedly when exposed to severe changes in temperature and humidity, but also causes the facing member and metal plate to separate. Ta. Therefore, it has been desired to develop decorative plywood having a three-dimensional shape that does not warp or deform when exposed to changes in temperature and humidity.

[Means to solve the problem]

The present invention has been made in order to solve the problems of the prior art described above, and is a decorative plywood having a three-dimensional shape in which a facing member and a lining member are bonded to the front and back surfaces of a metal plate. The member is a decorative plywood characterized in that the wooden parts have approximately the same thickness.

[Effect]

As described above, in the decorative plywood of the present invention, the wooden parts of the facing member and the backing member bonded to the front and back of the metal plate are
, so even if exposed to drastic changes in temperature and humidity, the front and back surfaces of the metal plate will expand and contract evenly over and over again, so it will not warp or deform. Next, the present invention will be explained in detail based on the illustrated embodiments.

Embodiment 1 FIGS. 1 to 3 are explanatory diagrams of decorative plywood according to a first embodiment. The decorative plywood of this example has a facing member 2 on one side of a metal plate 1 and a backing member 3 on the other side firmly adhered with an appropriate adhesive 4, and is bent into a two-dimensional three-dimensional shape. ing. The metal plate work is used to alleviate the remarkable directionality of the coefficient of thermal expansion of the facing member 2, and to give the decorative plywood a desired three-dimensional shape through plastic deformation when bent. is an aluminum plate with a thickness of 0.5 mm. Then, a facing member 2 is firmly adhered to one side and a backing member 3 is firmly adhered to the other side using a suitable adhesive (for example, a modified polyurethane emulsion adhesive) 4. The facing member 2 is a laminated member in which a natural wood veneer 21 with beautiful wood grain and excellent design, a resin-impregnated sheet 22 made of polyester nonwoven fabric, and a wood veneer 23 are sequentially arranged from the front side, In this case, the main component is the veneer 2.
1 is made of walnut wood with a thickness of O, am-, and natural beech wood with a thickness of 0.5 mm is used for the wood veneer 23, and the directions of the grains of these natural woods are perpendicular. They are stacked on top of each other to cancel out the remarkable directional expansion rate of natural wood. In this case, the resin-impregnated sheet 22 is
The polyester non-woven fabric is impregnated with a urea-vinyl acetate emulsion (not shown) and hardened to strengthen it, and is firmly adhered to the veneer 21 by the urea-vinyl acetate emulsion (not shown). Therefore, when the natural wood veneer 21 is bent into a desired shape by means such as press bending, it is possible to prevent microscopic cracks inherent in the wood from expanding into macroscopic cracks. It is highly effective in preventing That is, during bending, the veneer 2
Most of the cracks that occur in the resin-impregnated sheet 22 are caused by microscopic cracks that originally exist in many directions in the direction of the wood grain, which are enlarged by bending and develop into macroscopic cracks. If it is firmly adhered to the veneer 21 prior to this, the development of the microscopic cracks is inhibited and the occurrence of cracks is prevented. The backing member 3 has the same number of sheets (in this case, 2 pieces) and approximately the same thickness (in this case, 1.O,
), two wood veneers 31 made by slicing natural beech into 0.5 m-thick sheets are glued together with urea-vinyl acetate-based emulsilon, and the metal plate 1
It is firmly bonded to one side of the board with adhesive 4. In this case as well, the two wood veneers 31 are laminated so that the grain directions are perpendicular to each other, so that the directionality of the expansion coefficients is canceled out. The decorative plywood of the present invention having the above structure was manufactured by two-dimensional press bending using appropriate molds, for example, a female mold 5 and a male mold 6 made of casting. That is, two wooden veneers 31 constituting the backing member 3 are laminated with an uncured urea-vinyl acetate emulsion (not shown) in between so that the grain directions are perpendicular to each other, and then urea i! [The facing member 2, which has been adhesively fixed in advance with a vinyl emulsion (not shown), is laminated so as to be in contact with the surface of the wooden veneer 23 via the adhesive 4, and the molds 5 and 6 are stacked together. inserted between. Then, the metal plate 1, the facing member 2, and the backing member 3 were pressed into a desired two-dimensional three-dimensional shape by pressing at an appropriate pressure depending on the thickness and material, for example, a pressure of 20 kgf/cl. During the press bending process, the adhesive 4 is not hardened, so the metal plate 1 and the facing member 2
, and the backing member 3 were shifted in accordance with their respective elongation rates, and press bending was performed smoothly. After bending into a desired shape, the adhesive 4 is heated to an appropriate temperature, e.g., 130° C., for 3 minutes by passing high-temperature steam through a suitable heating means, e.g., a steam hole (not shown) provided inside the mold. was cured, and the facing member 2 and the backing member 3 were firmly adhered to the front and back surfaces of the metal plate 1, respectively. The decorative plywood with the above structure includes a facing member 2 and a backing member 3.
are bonded to the front and back surfaces of the metal plate 1 to form a three-dimensional shape, and the wooden parts (veneer 21 and wood veneer 23) of the facing member l, which have a dominant influence on thermal expansion, and the lining Between the wooden part of member 3 (two wooden veneers 31) and the
Because the thickness of the
Even after repeated exposure, both sides expanded and contracted evenly, so no abnormalities such as warping, deformation, or peeling of the adhesive edges were observed. Therefore, even when the decorative plywood of the present invention is used for interior materials such as automobile instrument panels and storage boxes and is exposed to severe changes in temperature and humidity, there is no practical problem at all. Table 1 [Example 2] In the decorative plywood of this example, as shown in FIG. It is a decorative plywood made of sheets. That is, the wooden veneer 23 disposed under the resin-impregnated sheet 22 is made of natural beech wood with a thickness of 0.3 - 21! The lower surface of the lower layer is adhered to the upper surface of the metal plate 1. In this case, the veneer 21 of the facing member 2 is made of compressed natural walnut with a thickness of 0.5-1 to make it flexible, and the resin-impregnated sheet 22 is made of a polyester nonwoven fabric impregnated with thermosetting urethane and cured. It is a sheet. The metal plate 1 is an aluminum plate having a thickness of 0.51 mm as in Example 1, and the backing member 3 is constructed by laminating three wooden veneers 31 made of natural beech and having a thickness of 4 am. Therefore, the thicknesses of the wood parts that have a dominant effect on the thermal expansion of the facing member 2 and the backing member 3 are l1m and 12m, respectively.
It is one and Roma-. The metal plate 1, the facing member 2, and the backing member 3 are firmly bonded to each other by an epoxy thermosetting adhesive 4. To give an overview of the method for manufacturing decorative plywood with the above configuration, the facing member 2 and the backing member 3 are bonded together in advance with an epoxy adhesive (not shown) prior to press bending, and the metal plate is 85 g/I/(dry) of the above-mentioned epoxy thermosetting adhesive 4 is applied to each adhesive surface of metal plate 1, and 20 g/+ of each is applied to both sides of metal plate 1.
20 k
A three-dimensional bending process with a bending depth of 10 cm was performed by applying a pressure of gf/cJ. After the press bending process, high-temperature steam is passed through a steam hole (not shown) provided inside the mold while applying pressure, and heated to 130° C. for 3 minutes to harden the adhesive 4, thereby forming the metal plate 1 and the mounting member. 2 and the backing member 3 were integrally bonded to each other. The wooden parts of the facing member 2 and the backing member 3 were laminated so that the wood grain directions were alternately orthogonal to each other. After repeatedly exposing the decorative plywood manufactured by the above method to the atmosphere shown in Table 1 10 times, a visual inspection was conducted.
In this case as well, no abnormalities such as warping, deformation, or peeling of the adhesive end were observed. The metal plate 1 may be any metal that has no directionality in its thermal expansion coefficient and has excellent plastic workability, so aluminum, stainless steel, copper, iron, etc. can be used as appropriate, but aluminum is lightweight and natural wood is suitable. It is particularly preferable because it provides a feeling of mass close to . The rigidity of these metal plates 1 differs depending on the type of material and manufacturing history, and therefore the plastic workability also differs, so the thickness that is easy to use varies, but - 0.1 for boat fishing.
Use in the range of ~11■. If it is less than 0.1++m, even if the stainless steel has high rigidity, the facing member 2 will be damaged after bending.
There is a concern that the mounting member 2 may not be able to withstand the stress that causes it to return to its original shape, or that it may not be able to withstand thermal distortion of the facing member 2 that occurs during use. On the other hand, if it exceeds 1, the resistance during bending will become too large even for aluminum with low rigidity, and an unnecessarily large force will be applied to the facing member 2, causing scratches, cracks, etc. on the facing member 2. becomes. In addition, metal plate 1
Alternatively, through holes of an appropriate shape (for example, a circle with a diameter of approximately 1 to 10 m) may be provided in an appropriate distribution, and the weight and rigidity may be adjusted. The veneer 21 arranged on the surface of the facing member 2 is preferably made of a beautiful natural material with excellent design.
Cedar, cypress, horse chestnut, purple altar, black altar, teak, rose, purple, etc. can be used as appropriate. If the thickness of the veneer 21 made of these materials is less than 0.2 mm, transparent parts may be created depending on the material, which may be inconvenient, and if the thickness exceeds 1 mm, the veneer 21 may be easily broken during bending. 2-1. , ) It is desirable to use it within a thickness range of 1 degree. When the veneer 21 made of natural wood is processed into a thin plate and then compressed under pressure, it has the additional advantage of increased flexibility and improved bending workability. Further, the resin-impregnated sheet 22 is firmly adhered to the veneer 21 of the facing member 2, so that the veneer 21
Since it is intended to prevent cracks from occurring in 1, it may be made of nonwoven fabric such as polyester, vinylon, polyester, rayon, or Japanese paper with a basis weight of 10 to 50 g/n+', and such materials may be impregnated. Examples of resins to be reinforced include various curable resins, rubber latex, urea-vinyl acetate emulsions, and the like. The resin-impregnated sheet 22 may be impregnated with an appropriate resin and cured, and then firmly adhered to the veneer 21 with an appropriate adhesive such as urethane resin or epoxy resin, or may be bonded to the adhesive surface of the veneer 21 with an appropriate adhesive. When adhering the resin-impregnated sheet 22 by applying an adhesive in multiple coats, the adhesive may be impregnated into the inside of the sheet to secure the adhesive and strengthen the adhesive at the same time. The veneer 21 of the facing member 2 is a buffer material that prevents stress during bending from directly acting on the natural wood veneer 21, and is completely invisible from the outside. Natural wood such as pine and ash can be used as appropriate regardless of the beauty or ugliness of the wood grain. Usually 0.
Slice it into 2 to 1 pieces and use it alone,
A plurality of sheets are stacked and used, and when a single sheet is used, the wood grain direction is arranged to be perpendicular to the wood grain direction of the veneer 21, and when a plurality of sheets are used, they are stacked one after another so that the wood grain directions are perpendicular to each other. 2. This is preferable because the directionality of expansion and contraction of the entire structure can be kept small. As mentioned above, the backing member 3 is a member for preventing the decorative plywood of the present invention from warping or deforming due to thermal expansion, and since it is a member that is not visible from the front, it may be selected from among the above-mentioned natural woods. Regardless of the beauty or ugliness of the wood grain, you can select and use the appropriate one. The plurality of wooden veneers 31 constituting the backing member 3 may be bonded and fixed to each other in advance using an appropriate adhesive, or may be bonded together during the bending process to give a three-dimensional shape. Also good. Further, it is also possible to insert a resin-impregnated sheet having the same structure as the resin-impregnated sheet 22 of the facing member 2 between the wooden veneers 31. The adhesive 4 for bonding the metal plate 11 facing member 2 and backing member 3 to each other is not particularly limited as long as it can maintain strong adhesive force over a long period of time.
Even if it is applied to each of the metal sheets, the facing member 2, and the backing member 3 and left to be laminated for a short period of time, or during bending, it will not harden, and each member will deform freely according to its elongation rate due to stress. Epoxy-based thermosetting adhesives and modified polyurethane-based emulsions that harden quickly when heated to a predetermined temperature, for example, 60 to 130°C by means of high-temperature steam, dielectric heating, direct current heating, etc. after completion of bending. etc. are easy to use. Note that the decorative plywood having a three-dimensional shape of the present invention can be finished by a known method if necessary. In other words, the process involves removing the flakes generated during bending, trimming the edges, correcting and coloring the wood grain of the veneer 21, painting with a urethane sealer to improve water resistance, and curable polyester paint as a top coat (using peroxide as a hardening agent). It is also possible to improve the gloss, abrasion resistance, weather resistance, etc. by coating the surface with a solvent such as a ketone-based solvent, polishing, etc. as appropriate.

【Effect of the invention】

As explained above, the decorative plywood according to the present invention is a decorative plywood having a three-dimensional shape in which a facing member and a lining member are bonded to the front and back surfaces of a metal plate, and has a dominant influence on the thermal expansion of the decorative plywood. The thickness of the wood part is the same between the facing material and the lining material, so even if it is used for automobile instrument panels and is exposed to severe changes in temperature and humidity, it will only expand and contract evenly on both sides. Therefore, not only will warpage, deformation, etc. occur, but there is also no risk of peeling off from the metal plate, facing member, or backing member.

[Brief explanation of drawings]

FIG. 1 is an explanatory cross-sectional view of the decorative plywood according to the present invention, FIG. 2 is an enlarged explanatory view thereof, and FIG. 3 is an explanatory view showing the manufacturing method thereof.
FIG. 4 is an enlarged sectional view showing another example of the present invention. DESCRIPTION OF SYMBOLS 1... Metal plate, 2... Facing member, 21... Veneer, 22... Resin-impregnated sheet, 23... Wood veneer, 3... Backing material, 31... Wood veneer Board, 4... Adhesive, 5.6... Mold. Patent applicant: Toppan Printing Co., Ltd. agent Teruo Akimoto and one other person

Claims (1)

[Claims] A decorative plywood having a three-dimensional shape in which a facing member and a lining member are bonded to the front and back surfaces of a metal plate, wherein the wooden parts of the facing member and the lining member have substantially the same thickness.