JP2002337107A - Method for manufacturing decorative plywood - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a decorative plywood capable pf easily and at a low cost manufacturing the decorative plywood of which the surface hardness is made high. SOLUTION: The method for manufacturing a decorative plywood 101 in which a decorative veneer 103 is stacked on a substrate plywood 102 is equipped with a preheating process that the decorative plywood 101 is heated, an impregnating agent-coating process that a resin impregnating agent 121 is coated thereafter, and an electron beam curing process that the coated resin impregnating agent 121 is irradiated with an electron beam to cure the resin impregnating agent 121 further thereafter.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a decorative plywood having an improved surface hardness, and more particularly to a method for producing a decorative plywood having an improved surface hardness with a resin impregnating agent.

[0002]

2. Description of the Related Art Conventionally, a decorative plywood in which a very thin decorative veneer such as cedar or hinoki is adhered to a base material plywood made of wood such as rawan wood is known. There are various applications for such decorative plywood, but it is used for applications requiring caster resistance, impact resistance, crack resistance, abrasion resistance, etc., such as flooring materials, staircase materials, furniture top plate materials, etc. Are also being used. In order to impart such characteristics to the decorative plywood, it is effective to increase the hardness of the decorative veneer or to harden the vicinity of the surface of the base material plywood.

As a method for increasing the hardness of a decorative veneer, for example, a resin is injected into the decorative veneer by a decompression method or a decompression / pressurization method, and then the resin is polymerized by heating or the like, and a plastic veneer is applied to the decorative veneer. WPC processing for imparting properties is widely performed. On the other hand, as a method of increasing the hardness of the surface of the base material plywood, for example, the surface of the base material plywood (between the base material plywood and the decorative veneer) is impregnated with a resin plate, a hard fiber plate (MDF), and a resin. There is known a method of forming a laminate structure in which a hard material such as a nonwoven fabric is laminated.

[0004]

However, since the resin is injected into the veneer as a batch process under reduced pressure or reduced pressure / pressure, the production cost is extremely high and the productivity is poor. Further, it is extremely difficult to apply this resin injection method to a base material plywood. On the other hand, laminating a hard material such as a resin plate, a hard fiber plate, or a resin-impregnated nonwoven fabric on the surface of the base material plywood complicates the manufacturing process because of the difficulty in bonding the hard material. In addition, there is also a problem that dimensional stability is poor and warpage is likely to occur due to a difference in swellability between the hard material laminated and the hard material and the decorative veneer and the base material plywood.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method for manufacturing a decorative plywood which can easily and inexpensively produce a decorative plywood having a high surface hardness. .

[0006]

The object of the present invention is to provide a method for manufacturing a decorative plywood in which a decorative veneer is laminated to a base material plywood, wherein a step of applying a resin impregnating agent, An electron beam curing step of irradiating the obtained resin impregnating agent with an electron beam to cure the resin impregnating agent.

According to the present invention, a resin impregnating agent is applied to a plate to be coated in an impregnating agent applying step. The plate to be coated may be a veneer veneer or a veneer veneer before the veneer veneer is bonded to the base material plywood, or a veneer veneer after the veneer is bonded. After the impregnating agent application step, the resin impregnant applied in the electron beam curing step is irradiated with an electron beam to cure the resin impregnating agent. This manufacturing method does not require depressurization or decompression and pressurization as in the WPC process, and can be processed under atmospheric pressure. Therefore, continuous processing can be performed and a decorative plywood can be easily and inexpensively manufactured.
Further, compared with the method of laminating a resin plate or the like, the process is simple, and a decorative plywood can be easily and inexpensively manufactured. Furthermore, the decorative plywood produced according to the present invention,
Since the swellability of the decorative plywood is significantly reduced due to the hardening of the resin impregnating agent, the dimensional stability is good, and the warpage is effectively suppressed. In addition, to use a high energy electron beam to cure the resin impregnating agent, as a resin impregnating agent,
Lower molecular oligomers and monomers can be selected, and the choice of resin impregnating agent is expanded. Since the low-molecular resin impregnating agent easily penetrates into the plate to be coated, it is possible to further penetrate the resin impregnating agent to a large depth to improve the surface hardness of the decorative plywood.

Here, as the resin impregnating agent, any one can be used as long as the surface hardness of the decorative plywood can be increased by curing with an electron beam. Acrylates such as cycloalkyl acrylate, phenyl acrylate, benzyl acrylate, glycidyl acrylate, alkyl methacrylate,
Cycloalkyl methacrylate, phenyl methacrylate,
Methacrylates such as benzyl methacrylate and glycidyl methacrylate; vinyl ester compounds such as vinyl acetate and vinyl propionate; vinyl alkyl ethers such as vinyl methyl ether; vinyl cyclohexyl ether; vinyl phenyl ether; vinyl benzyl ether; vinyl Vinyl ether compounds such as glycidyl ether; vinyl cyanide compounds such as acrylonitrile and methacrylonitrile; ethylenically unsaturated double bond-containing aromatic compounds such as styrene, vinyl toluene and α-methylstyrene; vinyl chloride; Vinyl halides such as vinyl; vinylidene chloride; vinylidene halides such as vinylidene bromide; maleic diesters such as dialkyl maleate; fumaric diesters such as dialkyl fumarate; Itaconic acid diesters of itaconic acid such as dimethyl, N, dialkyl acrylamides, such as N- dimethylacrylamide, N- vinylpyrrolidone, 2-
Heterocyclic vinyl compounds such as vinylpyridine, etc., 2-hydroxyethyl acrylate, hydroxypropyl acrylate, polyethylene glycol monoacrylate, polypropylene glycol monoacrylate, ε-caprolactone adduct of 2-hydroxyethyl acrylate,
Β-methyl-γ- of 2-hydroxyethyl acrylate
Acrylates such as valerolactone adducts, glycerol monoacrylate, and glycerol diacrylate;
2-hydroxyethyl methacrylate, hydroxypropyl methacrylate, polyethylene glycol monomethacrylate, polypropylene glycol monomethacrylate, ε-caprolactone adduct of 2-hydroxyethyl methacrylate, β-methyl-γ-valerolactone adduct of 2-hydroxyethyl methacrylate, glycerol Examples thereof include methacrylates such as monomethacrylate and glycerol dimethacrylate, allyl compounds such as allyl alcohol, glycerol monoallyl ether and glycerol diallyl ether, urethane acrylate (oligomer), and polyester acrylate. Further, unsaturated polyesters obtained by reacting glycols such as ethylene glycol and propylene glycol with unsaturated dicarboxylic acids such as maleic acid and fumaric acid or derivatives thereof can also be exemplified.

Further, in the above method for producing a decorative plywood, the impregnating agent applying step and the electron beam curing step may include the step of applying the decorative veneer and the substrate plywood to each other. It is good to use a method for manufacturing decorative plywood.

According to the present invention, a resin impregnating agent is applied to a decorative veneer of a decorative plywood in an impregnating agent application step, and is irradiated with an electron beam in an electron beam curing step to be cured. The decorative plywood on which the decorative veneer and the base material plywood are stuck is usually traded and easily available, or
Since it is enough to add the process of the present invention at the end of the process of manufacturing such a decorative plywood, according to this method, it is possible to easily manufacture a decorative plywood having an improved surface hardness. Further, it can be manufactured at low cost.

Alternatively, in the above method for producing a decorative plywood, the impregnating agent applying step and the electron beam curing step include:
Before the decorative veneer and the base material plywood are bonded to each other, a method of manufacturing a decorative plywood may be performed on at least one of the decorative veneer and the base material plywood.

According to the present invention, the resin impregnating agent is applied to the decorative veneer, the substrate plywood, or both in the impregnating agent application step, and the applied resin impregnating agent is cured in the electron beam curing step. Then, the veneer veneer and the base material plywood are laminated to make a veneer plywood. Even with such a manufacturing method, a decorative plywood having a high surface hardness can be easily and inexpensively manufactured. In particular, it is preferable to apply a resin impregnating agent to both the veneer veneer and the base material plywood and cure them, since the surface hardness of the veneer plywood is particularly improved.

Alternatively, in the method for producing a decorative plywood described above, the impregnating agent applying step and the electron beam curing step may include:
Performing on the base material plywood before bonding the decorative veneer and the base material plywood, and also performing on the decorative veneer of the decorative plywood after bonding the decorative veneer and the base material plywood It is good to use a manufacturing method.

According to the present invention, in the first impregnating agent application step, the resin impregnating agent is applied to the substrate plywood, and in the first electron beam curing step, the applied resin impregnating agent is cured. And
Attach the base plywood and decorative veneer. After that, the second
In the impregnating agent applying step, a resin impregnating agent is applied to the decorative veneer of the decorative plywood, and the applied resin impregnating agent is cured in the second electron beam curing step. Even with such a manufacturing method, the surface hardness of the decorative plywood can be easily and inexpensively increased. In particular, since the resin impregnating agent is applied to both the base plywood and the decorative veneer and cured, the surface hardness of the decorative plywood can be particularly hardened.

Alternatively, in the above method for producing a decorative plywood, the first impregnating agent application step is performed on the substrate plywood before the decorative veneer is bonded to the substrate plywood. After laminating the decorative veneer and the base material plywood,
It is preferable that the second impregnating agent applying step and the electron beam curing step are performed on a decorative veneer veneer veneer.

According to the present invention, in the first impregnating agent application step, a resin impregnating agent is applied to the base plywood. Thereafter, the base material plywood and the decorative veneer are laminated. Then, in the second impregnating agent applying step, the resin impregnating agent is applied to the decorative veneer of the decorative plywood. Thereafter, in the electron beam curing step, the resin impregnating agent impregnated in the decorative veneer and the decorative plywood is temporarily cured. This is because by increasing the acceleration voltage, the electron beam can reach not only the decorative veneer but also the base plywood thereunder. Even with such a manufacturing method, the surface hardness of the decorative plywood can be easily and inexpensively increased. In particular, since the resin impregnating agent is applied to both the base plywood and the decorative veneer and cured, the surface hardness of the decorative plywood can be particularly hardened. In the present invention, since the resin impregnating agent impregnated in the decorative veneer and the base material plywood is cured in one electron beam curing step, compared with the case of curing separately,
The number of processes and the number of electron beam irradiation devices can be reduced, and decorative plywood can be manufactured at low cost.

Further, in the method for producing a decorative plywood according to any one of the above, before the impregnating agent applying step,
It is preferable to use a method for producing a decorative plywood including a preheating step of heating the plate to be coated.

According to the present invention, the plate to be coated is heated in a preheating step before applying the resin impregnating agent. For this reason, when the resin impregnating agent is applied, the resin impregnating agent can permeate the coated plate in a large amount and deeply. Therefore, if this is cured with an electron beam, a decorative plywood having a higher surface hardness can be manufactured.

[0019]

(Embodiments 1 and 5) Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a partially enlarged cross-sectional view of the decorative plywood 101 of the first embodiment. The decorative plywood 101 has a substantially plate shape of about 30 cm × about 180 cm × about 1.2 cm, and a decorative veneer 103 is attached to a base material plywood 102. Among them, the base material plywood 102
Has five layers of Lauan veneer having a thickness of about 1.0 to 3.0 mm (5
Plies) are laminated. On the other hand, decorative veneer 103
Is a 0.3 mm thick cypress veneer. The resin impregnating agent 121 has penetrated into the decorative veneer 103 and is hardened.
Further, substantially the entire surface of the decorative veneer 103 is painted. Specifically, the coating film 114 includes an undercoating film 111 directly formed on the decorative veneer 103, an intermediate coating film 112 formed thereon, and a topcoating film 113 further formed thereon. Consists of

Next, a method of manufacturing the decorative plywood 101 will be described. First, the decorative veneer 10 is added to the base plywood 102.
A decorative plywood 101 to which 3 is attached is prepared. next,
In the preheating step, the decorative plywood 101 to be coated is heated. Specifically, decorative veneer 10 of decorative plywood 101
Irradiate the IR lamp for 30 seconds toward 3
The surface temperature of No. 03 is heated to about 100 ° C. The surface temperature was measured by an infrared non-contact thermometer.

Next, in the impregnating agent application step, a resin impregnating agent 121 is applied to substantially the entire surface of the decorative veneer 103 of the decorative plywood 101. Specifically, the heterocyclic vinyl monomer-based resin impregnating agent 121 is applied by passing twice through a sponge natural roll coater, and subsequently, the excessively applied resin impregnating agent 121 is applied with a steel reverse skirt kytriroll. Collect by scraping. Thereby, the resin impregnating agent 12
1 is a decorative plywood 101 at a rate of 15 g / (30 cm) ²
(Decorative veneer 103). In addition, resin impregnating agent 1
21 impregnates to a depth of about 200 μm. As will be described in detail later, in Embodiment 1, since the decorative plywood 101 is heated before the resin impregnating agent 121 is applied (preliminary heating step), the permeation amount of the resin impregnating agent 121 is large, and The depth is also deep.

Next, in the electron beam curing step, the applied resin impregnating agent 121 is irradiated with an electron beam,
1 is cured. Specifically, using an electron beam irradiation dryer (manufactured by Nissin High Voltage Co., Ltd.), the irradiation conditions were set to an acceleration voltage of 300 keV and an electron dose of 50 kGy (= 5
Mrad) and irradiate an electron beam. This allows
The surface hardness of the decorative plywood 101 is improved. In addition, since an experiment described later is performed on the decorative plywood 101 in this state, the process up to the manufacture of this decorative plywood is referred to as a fifth embodiment.

Next, in the undercoating step, decorative plywood 101
Is applied to the veneer veneer 103. Specifically, an undercoat paint (IST No. 30 manufactured by NATCO Corporation)
0) is applied with a rubber natural roll coater,
The excess paint is scraped off with a steel oyster roll coater. This primer (IST No. 300)
The base resin is composed of urethane acrylate, and 3 parts by weight of a photoinitiator is mixed with 100 parts by weight of the base resin. Thereafter, in the undercoat semi-curing step, the undercoat film 111 is irradiated with ultraviolet rays to be semi-cured. Specifically, the undercoat 111
Is irradiated with ultraviolet rays of 100 mJ / cm ² to the undercoat film 11.
1 is semi-cured.

Next, in the intermediate coating step, an intermediate coating is applied on the semi-cured undercoat 111. Specifically, an intermediate coating material (IST No. 400 manufactured by Natco Corporation) is applied by passing twice through a rubber natural roll coater. In this intermediate coating (IST No. 400), the base resin is made of an ester acrylate, and 3 parts by weight of a photoinitiator is mixed with 100 parts by weight of the base resin. Thereafter, in the intermediate coating semi-curing step, the intermediate coating film 112 is irradiated with ultraviolet rays to be semi-cured. Specifically, the intermediate coating film 112 is applied with an ultraviolet irradiation dryer at 100 mJ /
The intermediate coating film 112 is semi-cured by irradiating ultraviolet rays of cm ² .

Next, in the polishing step, the surface of the coating film is polished using # 320 sandpaper. This polishing is performed to make the appearance of the paint look more beautiful. This is because when the intermediate coating film 112 is semi-cured, the surface of the coating film is fluffy and uneven.

Next, in the topcoating step, a topcoat is applied on the semi-cured intermediate coat 112. Specifically, a top coat (IST No. 500 manufactured by Natco Corporation) is applied by passing twice through a rubber natural roll coater. Or you may apply using a curtain flow coater. In this top coat (IST No. 500), the base resin is made of ester acrylate, and the base resin 10
3 parts by weight of the photoinitiator is added to 0 parts by weight.
Thereafter, in a top coat curing step, the top coat 113 is irradiated with ultraviolet rays to be cured. Specifically, 250 mJ /
Irradiate ultraviolet rays of cm ² . Thereby, the top coat 11
3 is cured, and the undercoat 112 and the undercoat 111 thereunder are also cured. That is, the entire coating 114 is cured. Thus, the decorative plywood 101 is completed.

As described above, in the first embodiment, in the impregnating agent application step, the decorative veneer 103
The resin impregnating agent 121 is applied to the substrate, and the resin impregnating agent 121 applied in the electron beam curing step is irradiated with an electron beam to be cured. Therefore, decorative plywood 101 having a high surface hardness
It can be manufactured easily and inexpensively. Further, since the plate to be coated with the resin impregnating agent 121 is the decorative plywood 101, it can be easily obtained. In addition, decorative plywood 1 before painting
It is only necessary to add the steps of the present invention at the end of the manufacture of 01.
Moreover, the swelling property of the decorative plywood 101 is significantly reduced due to the hardening of the resin impregnating agent 121, so that the decorative plywood 101 has good dimensional stability and effectively suppresses warpage deformation. Further, in the first embodiment, the resin impregnating agent 121 is used.
Before applying, the decorative plywood 101 is heated in a preheating step. Therefore, when the resin impregnating agent 121 is applied,
The resin impregnating agent 121 can permeate a large amount and deeply. Therefore, decorative plywood 1 having higher surface hardness
01 can be manufactured.

(Embodiment 2) Next, a second embodiment will be described. The description of the same parts as in the first embodiment will be omitted or simplified. FIG. 2 shows a partially enlarged cross-sectional view of the decorative plywood 201 of the second embodiment. In this decorative plywood 201, a decorative veneer 203 is attached to a base material plywood 202. Among them, the base material plywood 202 has a thickness of about 3.0.
Three layers (three plies) of cedar-lawan composite boards of up to 4.0 mm are laminated. On the other hand, decorative veneer 203 is a veneer veneer having a thickness of 0.2 mm. In the vicinity of the surface of the base material plywood 202 of the decorative plywood 201, the resin impregnating agent 121 has penetrated and is hardened. Further, a coating film 114 is formed on substantially the entire surface of the decorative veneer 203 as in the first embodiment.

Next, a method for manufacturing the decorative plywood 201 will be described. First, the base plywood 202 and the decorative veneer 2
03 are separately prepared. Next, in the preheating step, the base material plywood 202 to be coated is heated. Specifically, an IR lamp is irradiated toward the base material plywood 202 for 30 seconds to heat the surface temperature of the base material plywood 202 to about 100 ° C.

Next, in the impregnating agent applying step, the same resin impregnating agent 121 as in the first embodiment is applied to substantially one entire surface of the base plywood 202 (the surface on which the decorative veneer 203 is to be attached later). This application may be performed in the same manner as in the first embodiment. Thereby, the resin impregnating agent 121 weighs 15 g / (30
cm) ^{2 into} the substrate plywood 202. Also,
The resin impregnating agent 121 impregnates to a depth of about 200 μm.
In addition, also in the second embodiment, since the base material plywood 202 is preheated before the application of the resin impregnating agent 121, the penetration amount of the resin impregnating agent 121 is large, and the penetration depth is also large. .

Next, in the electron beam curing step, the applied resin impregnating agent 121 is irradiated with an electron beam to cure the resin impregnating agent 121 in the same manner as in the first embodiment. Thereby, the surface hardness of the base material plywood 202 is improved. Next, on the surface of the base material plywood 202 impregnated with the resin impregnating agent 121,
The decorative veneer 203 is attached to make the decorative plywood 201. Thereafter, similarly to the first embodiment, the undercoating step, the undercoating semi-curing step, the intermediate coating step, the intermediate coating semi-curing step, the polishing step, the topcoating step, and the topcoat curing step are sequentially performed to complete the decorative plywood 201.

As described above, in the second embodiment, the resin impregnating agent 12
1 and the resin impregnating agent 1 applied in the electron beam curing step
21 is irradiated with an electron beam to cure it. Therefore, also in the second embodiment, the decorative plywood 201 having a high surface hardness can be easily and inexpensively manufactured. Further, the swelling property of the decorative plywood 201 is significantly reduced due to the hardening of the resin impregnating agent 121, so that the decorative plywood 201 has good dimensional stability and effectively suppresses warpage deformation. Furthermore, since the base material plywood 202 is heated in the preheating step before applying the resin impregnating agent 121, when the resin impregnating agent 121 is applied, a large amount of the resin impregnating agent 121 is penetrated deeply. be able to. Therefore,
The decorative plywood 201 having higher surface hardness can be manufactured.

(Embodiment 3) Next, a third embodiment will be described. The description of the same parts as in the first or second embodiment will be omitted or simplified. Embodiment 3
3 is a partially enlarged sectional view of the decorative plywood 301 of FIG. The decorative plywood 301 is the same as the base plywood 202 of the second embodiment.
And the decorative veneer 103 of the first embodiment. In the vicinity of the surface of the base material plywood 202, the same resin impregnating agent 121 as in the first and second embodiments is penetrated and hardened. Also, another type of resin impregnating agent 321 has penetrated into the decorative veneer 103 and has been hardened. Further, a coating film 114 is formed on substantially the entire surface of the decorative veneer 203 as in the first and second embodiments.

Next, a method of manufacturing the decorative plywood 301 will be described. First, the base material plywood 202 and the decorative veneer 1
03 are prepared separately. Next, in the preheating step, similarly to the second embodiment, the base material plywood 202 to be coated is heated.

Next, in the first impregnating agent application step, the same resin impregnating agent 121 as in the first and second embodiments is applied to substantially the entire surface of one side of the substrate plywood 202 (the surface on which the decorative veneer 103 is to be attached later). Is applied. This coating is performed in each of the first and second embodiments.
What is necessary is just to carry out similarly to 2. Also in the third embodiment, since the base material plywood 202 is preheated before the application of the resin impregnating agent 121, the penetration amount of the resin impregnating agent 121 is large, and the penetration depth is also large.

Next, in the first electron beam curing step, the applied resin impregnating agent 121 is irradiated with an electron beam to cure the resin impregnating agent 121 in the same manner as in the first and second embodiments. Thereby, the surface hardness of the base material plywood 202 is improved. Next, the decorative veneer 103 is attached to the surface of the base material plywood 202 impregnated with the resin impregnating agent 121, and the decorative plywood 30
Make one.

Next, in a second impregnating agent application step, a second resin impregnating agent 321 of 1,3-functional acrylic monomer is applied to substantially the entire surface of the decorative veneer 103 of the decorative plywood 301. This application may be performed in the same manner as in the first impregnating agent application step. Next, in the second electron beam curing step, similarly to the first electron beam curing step, the newly applied second resin impregnating agent 321 is irradiated with an electron beam, and the second resin impregnating agent 3 is irradiated.
21 is cured. Thereby, the surface hardness of decorative plywood 301 is further improved.

Thereafter, in the same manner as in the first and second embodiments, the undercoating step, the undercoating semi-curing step, the intermediate coating step, the intermediate coating semi-curing step, the polishing step, the topcoating step, and the topcoat curing step are sequentially performed.
The decorative plywood 301 is completed.

As described above, in the third embodiment, the resin impregnating agent 121 is applied to the base plywood 202 in the first impregnating agent applying step, and the resin impregnating agent applied in the first electron beam curing step is applied. The agent 121 is irradiated with an electron beam to be cured. Further, in the second impregnating agent application step, decorative plywood 301
A resin impregnating agent 321 is applied to the substrate, and the resin impregnating agent 321 newly applied in the second electron beam curing step is irradiated with an electron beam to be cured. Therefore, the decorative plywood 301 having a high surface hardness can be easily and inexpensively manufactured. In particular, in the third embodiment, the decorative veneer 103 and the decorative plywood 20
2 is impregnated with the resin impregnating agents 121 and 321 and cured, so that the surface hardness of the decorative plywood 301 can be particularly increased. Further, the decorative plywood 301 is formed by curing the resin impregnants 121 and 321.
Since the swellability of No. 1 is remarkably low, dimensional stability is particularly good, and in particular, warpage deformation is effectively suppressed. Furthermore, since the base material plywood 202 is heated in the preheating step before the first resin impregnating agent 121 is applied, the resin impregnating agent 121 is heated.
Is applied, the resin impregnating agent 121 can be permeated in a large amount and deeply. Therefore, the decorative plywood 201 having a higher surface hardness can be manufactured.

(Embodiment 4) Next, a fourth embodiment will be described. The description of the same parts as those in the first to third embodiments will be omitted or simplified. The decorative plywood 301 of the fourth embodiment is the same as the decorative plywood 301 of the third embodiment whose partial enlarged sectional view is shown in FIG. However, the manufacturing method is different from that of the third embodiment. Hereinafter, the manufacturing method of the fourth embodiment will be described. First, the base material plywood 2
02 and the veneer 103 are prepared. Next, in the preheating step, similarly to Embodiments 2 and 3, the base material plywood 202 serving as the coated plate is heated.

Next, in the first impregnating agent application step, the same resin impregnating agent 121 as in the first and second embodiments and the like is applied to substantially the entire surface of one side of the base plywood 202 (the surface on which the decorative veneer 103 is to be attached later). Is applied. This coating is performed in the first and second embodiments.
And so on. Also in the fourth embodiment, since the base material plywood 202 is preheated before the application of the resin impregnating agent 121, the penetration amount of the resin impregnating agent 121 is large, and the penetration depth is also large.

Next, the decorative plywood 301 is produced without performing the electron beam curing step. That is, the decorative veneer 103 is attached to the base material plywood 202 impregnated with the uncured resin impregnating agent 121. Next, in the second impregnating agent application step, a substantially monofunctional acrylic monomer (monofunctional trifunctional acrylic monomer and trifunctional acrylic monomer About one to one
) Of the second resin impregnating agent 321 is applied. This application may be performed in the same manner as in the first impregnating agent application step. Next, in an electron beam curing step, the decorative resin veneer 103 is irradiated with an electron beam to impregnate the second resin impregnating agent 32 impregnated therein.
1 is cured, and the first resin impregnating agent 121 impregnated in the base plywood 202 thereunder is also cured at a time. This is because, unlike ultraviolet light, the electron beam can reach the inside and cure the first and second resin impregnants 121 and 321. Thereby, the surface hardness of the decorative plywood 301 is improved.

Thereafter, in the same manner as in Embodiments 1 to 3, the undercoating step, the undercoating semi-curing step, the intermediate coating step, the intermediate coating semi-curing step, the polishing step, the topcoating step, and the topcoat curing step are sequentially performed.
Complete decorative plywood.

As described above, in the fourth embodiment, the resin impregnating agent 121 is applied to the base plywood 202 in the first impregnating agent applying step. Further, the second resin impregnating agent 321 is applied to the decorative veneer 103 of the decorative plywood 301 in the second impregnating agent application step, and the resin impregnating agents 121 and 321 are cured in the electron beam curing step. Therefore, also in the fourth embodiment, the decorative plywood 301 having a high surface hardness can be easily and inexpensively manufactured. In particular, in Embodiment 3, both the decorative veneer 103 and the decorative plywood 202 are impregnated with the resin impregnating agents 121 and 321 and are cured, so that the surface hardness of the decorative plywood 301 can be particularly increased.
In addition, since the decorative plywood 301 has the cured resin impregnants 121 and 321 hardened, the swellability of the decorative plywood 201 is significantly reduced, so that the dimensional stability is good and the warpage deformation is effectively suppressed.

In the fourth embodiment, the resin impregnants 121 and 321 impregnated in both the decorative veneer 103 and the decorative plywood 202 are cured in a single electron beam curing step. As compared with the above, the number of steps and the number of electron beam irradiation devices are reduced, and the decorative plywood 301 can be manufactured at low cost. Furthermore, since the base material plywood 202 is heated in the preheating step before the resin impregnating agent 121 is applied, the resin impregnating agent 1 is applied when the resin impregnating agent 121 is applied.
21 can be permeated in a large amount and deeply. Therefore, the decorative plywood 201 having a higher surface hardness can be manufactured.

(Experimental Result 1) Next, the surface hardness of each of the decorative plywood according to the present invention (Embodiments 5, 6, 7, 8) and the decorative plywood according to the prior art (Comparative Examples 4, 5, 6) was determined. Was measured, and the usefulness of the present invention was examined. The decorative plywood of the fifth embodiment is the decorative plywood 101 of the first embodiment before painting. The decorative plywood of the sixth embodiment is the decorative plywood 201 of the second embodiment before painting. The decorative plywood of the seventh embodiment is the decorative plywood 301 of the third embodiment before painting. The decorative plywood of Embodiment 8 is the decorative plywood 301 of Embodiment 4 before painting.

On the other hand, the decorative plywood of Comparative Embodiment 4 is the same as the decorative plywood of Embodiment 5, the base plywood 102 and the decorative veneer 103, but has not been treated with the resin impregnating agent 121. The decorative plywood of Comparative Embodiment 5 is the same as that of Embodiment 6.
Are the same as the base plywood 202 and the decorative veneer 203, but have not been treated with the resin impregnating agent 121. The decorative plywood of Comparative Embodiment 6 is the same as the decorative plywood of Embodiments 7 and 8, the base plywood 202 and the veneer veneer 103, but has not been treated with the resin impregnants 121 and 321. Table 1 shows the results of the survey.
Note that “impregnation” in the table indicates an impregnating agent application step,
"B" indicates an electron beam curing step.

[0048]

[Table 1]

The "hardness" shown in the lowermost column of Table 1 was measured by Barcol hardness (needle penetration hardness). Each value indicates the measured value. As a result, Comparative Example 4 showed low values of 25, Comparative Example 5 showed 40, and Comparative Example 6 showed 20. On the other hand, Embodiment 5 showed 70 and Embodiment 6 showed low values.
, 60 and 75 in the seventh embodiment, and 70 in the eighth embodiment. From this, it is understood that the surface hardness of the decorative plywood is improved by applying the present invention. Further, since the surface hardness of the fifth, seventh, and eighth embodiments is higher than that of the sixth embodiment, it is better to impregnate the decorative veneer with the resin impregnating agent than to impregnate only the base material plywood with the resin impregnating agent. It can be seen that the surface hardness can be increased. Furthermore, from the results of Embodiments 6 and 7, it is understood that when both the decorative veneer and the base material plywood are impregnated with the resin impregnating agent, the surface hardness is further increased. Furthermore, the results of Embodiment 7 are good, which indicates that it is optimal to separately cure the resin impregnants impregnated in the veneer veneer and the base material plywood separately.

(Experimental Result 2) Next, the decorative plywood 101, 201, 301 according to each of the above embodiments 1, 2, 3, 4
And a decorative plywood according to the prior art (Comparative Examples 1, 2, 3) were subjected to various investigations to examine the usefulness of the present invention. Table 2 shows the results.

[0051]

[Table 2]

The decorative plywood of Comparative Example 1 is the same as that of Comparative Example 4 described above.
Is applied in the same manner as in the above embodiments 1-4. The decorative plywood of Comparative Embodiment 2 is obtained by coating the decorative plywood of Comparative Embodiment 5 in the same manner as in Embodiments 1 to 4. The decorative plywood of Comparative Embodiment 3 is obtained by coating the decorative plywood of Comparative Embodiment 6 in the same manner as in Embodiments 1 to 4. As in Table 1, "impregnation" in Table 2 indicates an impregnating agent application step, and "EB" indicates an electron beam curing step.

In the comparative experiments shown in Table 2, "pencil hardness",
"Impact", "caster", "crack" was investigated. With respect to "pencil strength", a test for scratching the coating film surface was performed by a testing machine method based on JIS-K5400. The hardness of the hardest pencil, which does not scratch the coating even when scratched with a pencil, was examined. As a result, in Comparative Embodiment 1, “2
B ”,“ HB ”in Comparative Embodiment 2, and“ 2 ”in Comparative Embodiment 3.
B, whereas it was "2H" in the first embodiment, "H" in the second embodiment, "2H" in the third embodiment, and "2H" in the fourth embodiment. From this, it is understood that the surface strength is improved by applying the present invention.

The “impact” is based on JIS-K5400, and is a DuPont type, 500 g, イ ン チ inch, 300 mm
The survey was conducted under the condition of falling from the height of the mountain. Then, the depth of the dent was measured. As a result, Comparative Example 1 was 0.4 mm, Comparative Example 2 was 0.3 mm, Comparative Example 3
Was relatively large at 0.5 mm, whereas the first embodiment was 0.1 mm, the second embodiment was 0.1 mm,
0.1 mm in the third embodiment, 0.1 mm in the fourth embodiment
And a small value. This indicates that the application of the present invention improves the physical properties against impact.

For the "casters", a test was conducted in which casters with a load of 20 kg were reciprocated 1,000 times. Then, the depth of the dent was investigated. As a result, the comparative example 1 was 0.4 mm, the comparative example 2 was 0.4 mm, and the comparative example 3 was 0.5 mm, which was a relatively large value. It showed a small value. This indicates that the application of the present invention also improves castability.

In the "crack", two cycles were performed at 80 ° C. for 2 hours and at −20 ° C. for 2 hours based on the special plywood JAS standard. Then, the lengths of all generated cracks were measured and totaled. As a result, the comparative example 1 was relatively large, 20 cm, the comparative example 2 was 50 cm, and the comparative example 3 was 40 cm, whereas the first, third, and fourth embodiments were 0 cm, that is, no crack occurred. . Also, in the second embodiment, a slight crack was generated at 5 cm. From this, by applying the present invention,
It can be seen that cracking properties are also improved.

(Experimental Result 3) Next, the effectiveness of the preheating step was investigated. Table 3 shows the results.

[0058]

[Table 3]

No. Nos. 1, 2, and 3 used cypress 1 mm veneer as a material. 4, 5, and 6 were investigated using a 1 mm veneer cedar as a material. No. In Examples 1 and 4, the resin impregnating agent was applied at room temperature (25 ° C.) without performing the preheating step. No. In cases 2 and 5, the IR lamp is set to 1 in the preheating step.
Irradiation was performed for 0 second, and the surface temperature of the material was set to 50 degrees, and a resin impregnating agent was applied. No. In 3 and 6, in the preheating step, the IR
Irradiation was performed with a lamp for 30 seconds to adjust the surface temperature of the material to 100 ° C., and a resin impregnant was applied. And No. For each of the samples 1 to 6, the amount of the resin impregnant impregnated in the material (impregnant application amount) and the penetration depth of the impregnant into the material (penetration depth) were measured. The penetration depth was measured by observing the cross section of the material after applying the resin impregnating agent.

As a result, with respect to the cypress veneer, no.
In No. 1, the amount of the impregnating agent applied was 10 g / (30 cm) ² and the penetration depth was 50 μm. In the case of 2, the applied amount of the impregnating agent is 12
g / (30 cm) ² , penetration depth is 70 μm, N
o. In No. 3, the amount of the impregnating agent applied was 15 g / (30 cm) ² , and the penetration depth was 200 μm. From this, it is understood that the higher the material temperature at the time of applying the resin impregnating agent, the more the resin impregnating agent is impregnated and the deeper the impregnation.
The same can be said for the cedar veneer. That is, No.
In No. 4, the amount of the impregnating agent applied was 10 g / (30 cm) ² , and the penetration depth was 60 μm. In 5, the impregnating agent application amount is 15
g / (30 cm) ² , penetration depth is 100 μm, N
o. In No. 6, the amount of the impregnating agent applied was 20 g / (30 cm) ² , and the penetration depth was 300 μm. From this, it is understood that the higher the material temperature at the time of applying the resin impregnating agent, the more the resin impregnating agent is impregnated and the deeper the impregnation.

In the above, the present invention has been described with reference to the embodiments. However, the present invention is not limited to the above-described embodiments 1-4, and may be appropriately modified without departing from the gist thereof. It goes without saying that it can be applied. For example, before bonding a decorative veneer and a base material plywood, perform an impregnating agent application step and an electron beam curing step on the decorative veneer, and then make a decorative plywood by bonding the decorative veneer and the base material plywood. Can also. Also, before bonding the veneer veneer and the base material plywood, perform the impregnating agent application step and the electron beam curing step on the veneer veneer and the base material plywood, respectively, and then bond the veneer veneer and the base material plywood. You can also make decorative plywood.

[Brief description of the drawings]

FIG. 1 is a partially enlarged sectional view of a decorative plywood according to Embodiment 1.

FIG. 2 is a partially enlarged sectional view of a decorative plywood according to Embodiment 2.

FIG. 3 is a partially enlarged sectional view of a decorative plywood according to Embodiments 3 and 4.

[Explanation of symbols]

 101, 201, 301 decorative plywood 102, 202 base plywood 103, 203 decorative veneer 121 resin impregnating agent 321 (second) resin impregnating agent

Continued on the front page F-term (reference) 2B200 AA07 BA04 BA15 BA16 BB01 BB06 BB15 DA04 EA06 EE13 EF11 FA24 FA31 HA03 2B230 AA13 AA15 AA16 AA22 BA04 BA18 CB25 CC14 DA02 EB01 EB03 EB04 EB05 EB07 A03 A03 A03 A03 A03 A03 A03 A05 EA02 EA13 FA21 FA25 FA28 FA31 FA33 FA37 GA03 HA01

Claims (6)

[Claims] 1. A method for producing a decorative plywood in which a decorative veneer is laminated to a base material plywood, comprising: a step of applying a resin impregnating agent; and irradiating the applied resin impregnating agent with an electron beam; An electron beam curing step of curing a resin impregnating agent. 2. The method for manufacturing a decorative plywood according to claim 1, wherein the impregnating agent applying step and the electron beam curing step are performed in a state where the decorative veneer and the base material plywood are bonded to each other. Of veneer plywood for veneer veneers. 3. The method for manufacturing a decorative plywood according to claim 1, wherein the impregnating agent applying step and the electron beam curing step are performed before the decorative veneer and the base material plywood are bonded to each other. A method for producing decorative plywood for at least one of a veneer and a base plywood. 4. The method for producing a decorative plywood according to claim 1, wherein the impregnating agent applying step and the electron beam curing step are performed before bonding the decorative veneer and the substrate plywood. A method of manufacturing a decorative plywood, which is performed on a plywood, and also performed on a decorative veneer of the decorative plywood after bonding the decorative veneer and the base material plywood. 5. The method for producing a decorative plywood according to claim 1, wherein the first step of applying the impregnating agent is performed on the base plywood before the decorative veneer is bonded to the base plywood. After bonding the decorative veneer and the base material plywood, the second
The decorative impregnating agent applying step and the electron beam curing step are performed on a decorative veneer veneer. 6. The method for producing a decorative plywood according to claim 1, wherein said decorative plywood comprises a preheating step of heating said coated plate prior to said impregnating agent applying step. Plywood manufacturing method.