JP4373830B2 - Curved veneer sheet and method for producing the same - Google Patents

Description

  The present invention relates to a veneer sheet capable of applying a decorative process to a base material having a three-dimensional curved surface and a method for producing the same.

  Natural wood presents a beautiful bark pattern according to the tree species, the site of use, etc., and a veneer is known as one that uses this bark pattern as a cosmetic material. This veneer has been improved in its manufacturing method, and now a veneer material of 1 mm or less is obtained from the processed material of raw wood, and it is firmly attached to the surface of plywood etc. as a base material to constitute a decorative surface Yes. With such a makeup effect attracting attention, for example, parts that have a three-dimensional curved surface such as automobile interior parts, the demand for surface decoration is increasing due to the so-called natural wood veneer along with high-grade orientation. We are looking to realize parts that can be machined.

  By the way, there is not much technical difficulty in sticking the veneer material to the flat base material, but because the veneer material is natural wood, it is a three-dimensional curved surface with large curved irregularities When applied to the above, there is a problem that cracks, tears and cracks are likely to occur.

  As a prior art for sticking a veneer sheet to a curved surface, for example, a non-woven fabric is laminated on the surface of the veneer side of the veneer sheet that has been sliced (stripped) thinly, and then embossed or fine cuts are made from the surface of the non-woven fabric side. (See, for example, Patent Document 1) After applying an undercoat paint that is UV curable and precured by a chemical reaction other than ultraviolet light or by solvent volatilization, a precured veneer sheet is prepared. For example, a UV curable top coat is applied to the surface of the undercoat or the undercoat is cured by irradiating with ultraviolet rays in an uncoated state (see, for example, Patent Document 2).

However, in Patent Document 2, for example, a special paint is thickly applied to the surface of the veneer sheet, so that the texture of natural wood cannot be fully utilized. In this case, it is considered that it is necessary to affix a plastic film as described in the examples of this publication. is there.
Japanese Utility Model Publication No. 5-7442 JP-A-4-21601

  The present invention has been made in view of such a background. The veneer sheet is a three-dimensional curved surface with a large uneven surface, with the textured texture and texture of natural bark sufficiently maintained. However, it is a technical problem to develop a veneer sheet that can be pasted and is durable and can be curved, and is not easily broken, torn or cracked.

In other words, the veneer sheet having a curved surface according to claim 1 is a wood cutting process for obtaining a processed material having a shape suitable for piercing from raw wood, and boiling this processed material over 2 to 80 days. Boiling starts from low temperature, gradually increases the hot water temperature until just before the removal, and rapidly increases the hot water temperature to the upper limit of 50 to 70 ° C just before the removal, and thinly strips the work material that has undergone the boiling process, A veneer process for obtaining a material, a veneer material pretreatment process for drying and curing the veneer material, a backing material preparation process for separately applying an adhesive for adhering the veneer material to one side of the backing material, and the backing material and the veneer It is characterized by being obtained through a thermocompression bonding process in which a material is heat-compressed on a base plate and a product peeling process in which a backing material with a backing material integrated with the backing material is removed from the base plate. .

  In addition to the requirement of claim 1, the curved veneer sheet according to claim 2 has the base plate so that the veneer with backing material can be easily removed from the base plate in the product peeling step. On the other hand, it is characterized by sticking a release paper.

Furthermore, in addition to the requirements of claim 1 or 2 , the curved veneer veneer sheet according to claim 3 is characterized in that the veneer material thickness is set to 0.17 mm or more and 0.4 mm or less in the pushing process. It consists of.

Furthermore, in addition to the requirements described in claim 1, 2 or 3 , the curved veneer veneer sheet according to claim 4 is performed by radiant heat of a heater within one hour after piercing in the veneer material pretreatment step. It is characterized in that a rapid drying process for evaporating about 70% of the water content of the protruding plate material and a subsequent natural drying process for several days or more are performed.

Furthermore, in addition to the requirements of claim 1, 2, 3 or 4 , the backing material prepared in the backing material preparation step is a Japanese paper raw material and a synthetic pulp raw material. It is characterized by being paper made from a raw material liquid having

Furthermore, in addition to the requirements of claim 1, 2, 3, 4 or 5 , the veneer plate capable of curved makeup according to claim 6 is a base plate between the thermocompression bonding step and the product peeling step. A polishing finishing process is provided to polish the surface of the veneer with the backing material in a supported state. In this polishing finishing process, the abrasive is brought into contact with the veneer material multiple times and the contact pressure is the first contact. And the subsequent contact pressure is increased.

Furthermore, the manufacturing method of the veneer sheet which can make a curved surface according to claim 7 includes: a wood cutting process for obtaining a processed material having a shape suitable for piercing from a raw wood , and boiling the processed material for 2 to 80 days; When boiling, start boiling from a low temperature, gradually increase the hot water temperature until just before the removal, and increase the hot water temperature to the upper limit of 50 to 70 ° C immediately before the removal, and thin the work material that has undergone the boiling process. Peeling and obtaining a veneer material, a veneer material pre-treatment process for drying and curing the veneer material, and separately applying an adhesive for adhering the veneer material to one side of the lining material The backing material preparation process for fixing to the back and the veneer material obtained by the abutting process are pasted on the base plate on which the backing material is fixed so as to overlap, and in this state, the veneer material and the backing material are thermocompression bonded. Thermocompression bonding process It is obtained through a polishing finishing process for polishing the surface of the backing material with backing material in a state supported by the backing plate, and a product peeling process for removing the backing material with backing material integrated with the backing material from the backing plate. It is characterized by this.

Furthermore, the method for producing a curved veneer sheet according to claim 8 is such that, in addition to the requirement of claim 7 , in the product peeling step, the veneer material with backing material can be easily removed from the base plate. The release paper is adhered to the base plate.

Furthermore, in addition to the requirements of claim 7 or 8 , the manufacturing method of the curved face decorative veneer sheet according to claim 9 is characterized in that, in the veneer material pretreatment step, the radiant heat of the heater is used within one hour after the exfoliation. The quick drying which evaporates about 70% of the moisture content of the said veneer material to be performed, and the subsequent natural drying for several days or more are performed.

Furthermore, the method for producing a curved veneer sheet according to claim 10 is supported by a base plate between the thermocompression bonding step and the product peeling step in addition to the requirements of claim 7, 8 or 9. A polishing finishing process is provided to polish the surface of the veneer-backed veneer material in a finished state, and in this polishing finishing process, the abrasive is brought into contact with the veneer material a plurality of times and the contact pressure is the first contact. It is characterized by a low and subsequent high contact pressure.

The veneer sheet with a curved surface and the method for producing the same according to the present invention have the following effects by the above-described means.
In other words, according to the veneer sheet capable of making a curved surface according to claim 1, the manufactured veneer sheet is extremely flexible and does not crack, break or crack even when pasted on a three-dimensional curved surface having a large curved surface. High adhesion.
Furthermore, according to the veneer sheet that can be curved, it is slowly boiled over time, and the hot water temperature is rapidly increased to the upper limit temperature that the log can withstand immediately before the last removal, so the burden of the log in the boil process is reduced. There are few veneer materials that are less prone to breakage such as cracking or tearing in the thrusting process, and they are flexible, and even when pasted on a three-dimensional curved surface, cracking, tearing, and cracking are less likely to occur.

  In addition, according to the veneer sheet capable of making a curved surface according to claim 2, since the release paper is adhered to the base plate, the release material of the back plate with the backing material in the product peeling process is produced with good peelability. The efficiency is improved, and the backing material does not peel off due to adhering to the base plate side, or the adhesive property with the base plate side is strong, and it is difficult to peel off, resulting in product loss that causes the backing material or the veneer material to be torn. It becomes difficult.

Furthermore, according to the veneer sheet with a curved surface according to claim 3 , the veneer sheet is flexible because it is thin, and can cope with a three-dimensional curved surface with finer irregularities.

Furthermore, according to the veneer sheet with a curved surface according to claim 4 , since quick drying is performed within one hour after piercing and peeling, natural drying (curing) is performed over a long period of time. It does not solidify in a state where it is contracted from a dozen percent to a dozen or more percent, and it is possible to obtain an elastic and strong protruding plate material, while it is being stretched on the stretched material, and after being stretched, cracks and tears, It is hard to crack.

Further, according to the veneer sheet capable of making a curved surface according to claim 5 , since the backing material is made of paper, it is rich in water permeability, has good compatibility with the veneer material, and is deformed and fixed in conformity with the substrate shape. Figured.

Furthermore, according to the veneer sheet capable of making a curved surface according to claim 6, since the polishing finishing step of polishing the surface of the veneer material is provided, the surface of the veneer sheet is attached after the veneer sheet is adhered to the item to be decorated. Therefore, it is possible to eliminate or eliminate the need for polishing finish. Moreover, since the contact pressure of the abrasive was low for the initial contact and increased for the subsequent contact pressure, the surface of the protruding plate material was smoothed without difficulty.

Furthermore, according to the method for manufacturing a curved veneer sheet according to claim 7 , the manufactured veneer sheet is extremely flexible, and can be cracked or torn even when it is attached to a three-dimensional curved surface having a large curved surface. No cracking and high adhesion.
Furthermore, according to the method for producing a veneer sheet capable of making a curved surface, it is gradually boiled over time, and the hot water temperature is rapidly increased to the upper limit temperature that the raw wood can withstand immediately before the last removal. The veneer material obtained with less burden on the raw wood and less prone to breakage such as cracking and tearing in the thrusting process is flexible, and even when pasted on a three-dimensional curved surface, cracking, tearing and cracking are less likely to occur .

Furthermore, according to the method for producing a curved veneer sheet according to claim 8, the release paper is attached to the base plate, so that the release material with the backing material is peeled from the base plate in the product peeling step. It improves the production efficiency, and the backing material does not peel off because it adheres to the base plate side, or the adhesive to the base plate side is strong, making it difficult to peel off and the backing material or the veneer material may be torn. Product loss is less likely to occur.

Furthermore, according to the method for producing a veneer plate capable of making a curved surface according to claim 9 , after quick drying within 1 hour after peeling, natural drying (curing) is performed over a long period of time, The veneer material does not solidify in a contracted state by more than 10 percent, and it is possible to obtain a strong and elastic veneer material 2 and it is cracked, cracked or torn while being stretched on the stretched material, or after being stretched Is unlikely to occur.

Furthermore, according to the method for producing a curved veneer sheet according to claim 10, since the polishing finishing process for polishing the surface of the veneer material is provided, the veneer sheet is attached to the object to be decorated, A polishing finish on the surface of the sheet is not necessary or can be simplified. In addition, since the contact pressure of the abrasive is low for the initial contact, and the subsequent contact pressure is high, the surface of the protruding plate material can be smoothed without difficulty.

  The best mode of the present invention is to achieve the object of obtaining a veneer sheet that can be pasted even with a three-dimensional curved surface with large irregularities on the curved surface, with the natural bark exposed on the surface, Specifically, as described in the following examples.

  Hereinafter, the present invention will be described based on illustrated embodiments. In the following description, first, the method for producing a curved veneer sheet with a curved surface according to the present invention will be described, and then the curved veneer sheet with a curved surface according to the present invention manufactured thereby will be described.

First, the curved veneer sheet 1 according to the present invention can be obtained through the following manufacturing process.
(1) Kitori process (see Fig. 4 (a))
First, a standing tree is cut down to obtain a raw wood W0 (log), and this is transported by sea, for example. The tree species suitable for the veneer sheet 1 are mainly broad-leaved trees, and many kinds such as oak, tamo, hippopotamus, zelkova, oak, teak and maple can be applied. Then, wood is obtained from the raw wood W0 to obtain a processed material W1 having a shape suitable for butt processing.

(2) Boil process (see FIG. 4B)
Then, the processed material W1 from which the wood has been removed is placed in a boiling tank T and boiled. This is to obtain a thin veneer material 2 by boiling for a long time, thereby facilitating shaving in a later-described thrusting step. This boil process is performed for 60 hours to 80 days, and the hot water temperature is gradually increased during that time. The number of days required for the boil process and the final upper limit temperature differ depending on the state of the raw wood W0 even for the tree species and the same tree species. For example, in the case of ebony, boiling is performed over 60 days, and the initial temperature (water temperature) is about 4 ° C. of the cold water temperature, from which it is gradually increased by about 1 ° C. per day. By the last 3 days, which is the period immediately before the removal, the temperature is set to about 50 ° C (appropriate temperature is selected in the state of the processed material W1), and the upper limit temperature of boiling water for boiling the ebony for the last 3 days Boil at 60 ° C. In the case of hard maple, boiling is performed for 3 days, the temperature on the first day is 20 to 32 ° C., the temperature on the second day is 33 to 38 ° C., and the temperature on the third day is 39 ˜55 ° C. (55 ° C. is the upper limit temperature for boiling the hard maple).

(3) Pushing process (see FIG. 4C)
In the thrusting process, the workpiece W1 that has undergone the boiling process is cut by a cutting machine such as a rotary leaser, a longitudinal thruster, or a laterally thruster depending on the application of the projecting plate sheet 1. Incidentally, in this embodiment, a rotary leaser is used as the cutting machine. It is to be noted that the thickness of the protruding plate material 2 is preferably cut within a range of 0.17 mm or more and 0.3 mm or less, and the thickness of 0.4 mm or less is suitable for use on the curved portion Dr with strong bending.

(4) Veneer plate pretreatment process (see FIGS. 4D and 4E)
The veneer material 2 obtained in the pushing process is suspended in a drying chamber within 30 minutes and subjected to quick drying to evaporate about 70% of moisture contained by radiant heat from a heater (for example, the drying chamber temperature is about 38). ℃) for about a day, and dry naturally under indoor environment. After that, the veneer material 2 is placed in a stacked state and cured for several tens of days. The quick drying is preferably completed within 1 hour at the longest. In this veneer material pretreatment process, the veneer material is shrunk from 10 to 20 percent, but it does not set in the shrunken state, and a very strong veneer material having elasticity can be obtained. Note that a dielectric heater using a microwave is not suitable as the heater.

(5) Backing material preparation step (see FIGS. 2 and 4 (f))
On the other hand, in a separate process, a backing material 3 to be affixed to the back surface of the veneer material 2 is prepared. In this embodiment, the backing material 3 is made of paper. Specifically, a Japanese paper raw material and synthetic pulp are used. A material made from a raw material liquid having a raw material and having a stretchability that can correspond to the stretchability of the protruding plate material 2 is used. In addition, as the base plate 5, what has a smooth surface and appropriate heat resistance and intensity | strength is preferable, for example, synthetic resin boards, such as a gellarmin board and a polyester board, and a veneer board etc. can be used. Note that when the backing material 3 adhered to the base plate 5 and a material that easily peels off are used, it is not always necessary to attach the release paper 6. In this backing material preparation step, the backing material 3 is pasted on the base plate 5, and first, the adhesive 4 is applied on the base plate 5 on which the release paper 6 is pasted, and then on that. The backing material 3 is adhered, and the adhesive 4 is applied to the upper surface of the backing material 3 on the base plate 5.

(6) Thermocompression bonding process (see FIG. 4 (g))
In the thermocompression bonding step, the protruding plate material 2 is placed on the upper surface of the backing material 3 to which the adhesive 4 on the base plate 5 is applied, and is thermocompression bonded. As this heating means, for example, a heating press apparatus P is used, and the heating press is performed at a pressure of 100 kg / cm ² and a heating temperature of about 100 ° C. for about 5 to 10 seconds.

(7) Polishing finishing process (see FIG. 4 (h))
Next, the protruding plate material 2 in a state where it is held by being heat-pressed on the base plate 5 is polished with a sander S. This polishing finish is performed by bringing the abrasive S1 (sanding belt) into contact a plurality of times, and the contact pressure is low for the initial contact and then the contact pressure is increased. Specifically, the abrasive is one having a roughness of about 240 as an example, and the initial contact pressure is the pressure of the air pad S2 that presses the abrasive S1 from the opposite side of the polishing surface. The contact pressure is about 0.05 to 0.2 kg / cm ² , and the subsequent contact pressure is about three times that pressure. Note that this polishing finishing step can be omitted as appropriate, and polishing finishing may be performed after sticking the veneer sheet 1 to the stretched material D as shown in FIG.

(8) Product peeling process (see Fig. 4 (i))
After peeling off the veneer material 2 with the backing material 3 integrated with the backing material 3 from the base plate 5 and inspecting for cracks, tears, cracks, etc., the veneer sheet 1 according to the present invention is obtained. Since the release paper 6 is attached to the base plate 5 at the time of peeling, the backing material 3 does not stick to the base plate 5 and sticks to the protruding plate material 2 side, which makes it very easy to peel off.

  The veneer sheet 1 obtained as described above is rich in flexibility and is also cracked, torn, cracked, etc. in the stretched material D having a three-dimensional curved surface portion Dr with a large difference in level of unevenness that cannot be accommodated conventionally. It can be stretched without causing

It is a perspective view which shows the usage condition of the veneer sheet | seat of this invention. It is a perspective view which decomposes | disassembles and shows the baseplate used for manufacture of the protruding plate sheet | seat of this invention, and a protruding plate sheet, and release paper. It is a block diagram which shows each process and its flow of the manufacturing method of this invention. It is explanatory drawing same as the above.

DESCRIPTION OF SYMBOLS 1 Veneer sheet 2 Veneer material 3 Backing material 4 Adhesive 5 Base plate 6 Release paper D Stretch material Dr Curved surface part P Heating press S Sander S1 Abrasive material S2 Air pad T Boiling tank W0 Raw wood W1 Work material

Claims (10)

The wood-cutting process to obtain a processed material with a shape suitable for piercing from raw wood , and boil this processed material over 2 to 80 days. When boiling, start boiling from a low temperature and keep hot water until just before the removal. A boil process that gradually increases the hot water temperature to the upper limit temperature of 50 to 70 ° C. immediately before the take- off, a butt process that thinly peels off the processed material that has undergone the boil process to obtain a veneer material, and a veneer that dries and cures the veneer material A material pretreatment step, a backing material preparation step for applying an adhesive for adhering the veneer material to one side of the backing material separately, and a thermocompression bonding step for thermocompression bonding the backing material and the veneer material on the base plate A veneer sheet with a curved surface, which is obtained through a product exfoliation process in which a veneer material with a backing material integrated with a backing material is removed from a base plate.   2. The curved surface makeup according to claim 1, wherein, in the product peeling step, a release paper is attached to the base plate so that the veneer material with backing material can be easily peeled off from the base plate. Veneer sheet. 3. The veneer sheet capable of applying a curved surface according to claim 1, wherein a thickness of the veneer plate is 0.17 mm or more and 0.4 mm or less in the pushing step. In the veneer material pretreatment step, a process of quick drying that evaporates about 70% of the water content of the veneer material performed by radiant heat of a heater within one hour after peeling and subsequent natural drying for several days or more. 4. A veneer sheet capable of applying a curved surface as claimed in claim 1, 2, or 3 . The curved backing material according to claim 1, 2, 3 or 4, wherein the backing material prepared in the backing material preparation step is paper made from a raw material liquid having a Japanese paper raw material and a synthetic pulp raw material. Veneer sheet. Between the thermocompression bonding step and the product peeling step, there is provided a polishing finishing step for polishing the surface of the veneer material with backing material supported by the base plate. In this polishing finishing step, the veneer plate material contrast, several times and the contact pressure abrasive contacting the low initial contact, curved decorative possible veneer according to claim 1, 2, 3, 4 or 5, wherein it has increased subsequent contact pressure Sheet. The wood-cutting process to obtain a processed material with a shape suitable for piercing from raw wood , and boil this processed material over 2 to 80 days. When boiling, start boiling from a low temperature and keep hot water until just before the removal. A boil process that gradually increases the hot water temperature to the upper limit temperature of 50 to 70 ° C. immediately before the take- off, a butt process that thinly peels off the processed material that has undergone the boil process to obtain a veneer material, and a veneer that dries and cures the veneer material A material pretreatment process, a backing material preparation process in which an adhesive for adhering to the veneer material is separately applied to one side of the backing material, and the backing material is fixed to the base plate, and the base plate on which the backing material is fixed A veneer material with a backing material in a state supported by a base plate, and a thermocompression bonding process in which the veneer material obtained by the abutting process is pasted so as to overlap, and the veneer material and the backing material are thermocompression bonded in this state. Polish the surface of A polishing finishing step, a curved decorative capable veneer sheet manufacturing method which is characterized in that it is obtained through a product separation step of peeling takes backing with veneer material became backing integrally from the base plate. 8. The curved surface makeup according to claim 7 , wherein in the product peeling step, a release paper is pasted on the base plate so that the veneer material with backing material can be easily removed from the base plate. A method for manufacturing a veneer sheet. In the veneer material pretreatment step, a process of quick drying that evaporates about 70% of the water content of the veneer material performed by radiant heat of a heater within one hour after peeling and subsequent natural drying for several days or more. The method for producing a veneer sheet capable of applying a curved surface according to claim 7 or 8, wherein: Between the thermocompression bonding step and the product peeling step, there is provided a polishing finishing step for polishing the surface of the veneer material with backing material supported by the base plate. In this polishing finishing step, the veneer plate material The method according to claim 7, 8 or 9, wherein the abrasive is contacted a plurality of times, and the contact pressure is low for the initial contact and the contact pressure thereafter is increased. .

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