JP2003088844A - Method of separating decorative wooden material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of separating a decorative wooden material which can easily separate a substrate and decorative sheet joined to each other by an adhesive and can facilitate recycling of resources. SOLUTION: The method of separating the decorative wooden material comprises separating the wooden substrate (1) and decorative sheet (2) joined to each other by the adhesive (3), in which the adhesive (3) is separable by heating and the process step of separating the substrate (1) and the decorative sheet (2) consists of a coarse crushing process step of coarsely crushing the decorative wooden material by a crushing machine or the like, a thermal separating process step of separating the materials by heating and a gravity separating process step of sorting the materials of a light specific gravity and the materials of a heavy specific gravity.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for separating a decorative wood material, and more particularly to a method for separating a decorative wood material useful as a building material or furniture.

[0002]

2. Description of the Related Art Conventionally, there has been provided a decorative wood material constituted by using a wood material such as a medium density fiberboard (MDF) or particle board as a substrate and providing a decorative sheet such as a resin sheet on the substrate. It was used as a building material and furniture.

In producing such a decorative wood material, conventionally, a substrate and a decorative sheet have been bonded to each other with a reaction-curing adhesive.

[0004]

By the way, there has been a demand for effective utilization of resources by recycling industrial products due to the recent growing environmental problems and demands for resource saving, and as described above. Decorative wood materials are also required to be recycled.

However, in such a decorative wood material, it is necessary to separate the substrate and the decorative sheet, which are joined by an adhesive, for recycling, and the adhesive is a reaction hardening type. It was very difficult to separate the substrate and the decorative sheet. That is, under the present circumstances, it was very difficult to separate the substrate and the decorative sheet into each and send each to recycling.

The present invention has been made in order to solve the above-mentioned problems, and an object of the present invention is to make it possible to easily separate a substrate and a decorative sheet bonded with an adhesive. The present invention provides a method for separating decorative wood materials that facilitates the reuse of resources.

[0007]

A method for separating a decorative wood material according to claim 1 of the present invention comprises a wooden substrate (1) and a decorative sheet (2) which are bonded to each other with an adhesive (3). A method for separating a decorative wood material, wherein the adhesive (3) is peelable by heating, and the step of separating the substrate (1) and the decorative sheet (2) is crushing. It is characterized by comprising a rough crushing step of roughly crushing with a machine, a heat separating step of separating by heating, and a specific gravity separating step of separating a material having a small specific gravity and a material having a large specific gravity.

The method for separating a decorative wood material according to a second aspect of the present invention is characterized in that the adhesive (3) contains a thermal expansion agent having a thermal expansion property.

In the method for separating a decorative wood material according to claim 3 of the present invention, the adhesive (3) is a vinyl-based material, a silicon-based material,
Alternatively, it is characterized in that it is any one of urethane type.

The method for separating a decorative wood material according to a fourth aspect of the present invention is characterized in that the specific gravity separation step is a step performed by either a blast type separation or a centrifugal type separation.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will now be described in detail with reference to the drawings according to the embodiments.

FIG. 1 is a perspective view showing a decorative wood material according to one embodiment of the method for separating a decorative wood material of the present invention. FIG. 2 is a perspective view showing a decorative wood material according to another embodiment of the method for separating a decorative wood material of the present invention. FIG. 3 is a schematic view showing a rough crushing step according to one embodiment in the method for separating a decorative wood material of the present invention. FIG. 4 shows a method for separating a decorative wood material according to the present invention.
It is the schematic which showed the heating separation process which concerns on one Embodiment.
FIG. 5: is the schematic which showed the ventilation type | mold separation of the specific gravity separation process which concerns on one Embodiment in the separation method of the decorative wood material of this invention. FIG. 6 is a schematic view showing centrifugal separation in the specific gravity separation step according to the embodiment in the method for separating decorative wood material according to the present invention.

As shown in FIGS. 1 to 6, the method for separating a decorative wood material according to the present invention separates a wooden substrate (1) and a decorative sheet (2) which are bonded to each other with an adhesive (3). A method for separating decorative wood materials, comprising the adhesive (3)
However, the substrate (1) can be peeled off by heating.
The step of separating the cosmetic sheet (2) and the decorative sheet (2) is a rough crushing step of roughly crushing with a crusher, a heat separating step of separating by heating, and a specific gravity for separating a light specific gravity and a heavy specific gravity. It consists of a separation process.

The substrate (1) is made of wood,
As shown in FIG. 1, it may be composed of a plurality of two or more layers having a base material portion (4) and a core material (5). As shown in FIG. It may be a single layer such as only the portion (4). As the substrate (1), various substrates can be adopted as long as they are made of wood. For example, for both the base material portion (4) and the core material (5), A wood board such as a medium density fiber board (MDF), particle board or plywood can be adopted.

The decorative sheet (2) is made of a resin sheet such as an olefin sheet. The decorative sheet (2) is provided with various decorative designs, such as having a wood grain pattern, if necessary.

In the case of the one shown in FIG. 1, the one shown in FIG. 2 is utilized as a so-called decorative base material. Specifically, the base material portion (4) shown in FIG. 2 is used. A single layer made of only the above and the decorative sheet (2) bonded to each other with an adhesive (3) are subjected to a V-cut method and wound around a core material (5). It is what The decorative wood material shown in FIG. 1 thus obtained is used for, for example, a closet or a door.

The adhesive (3) bonds the substrate (1) and the decorative sheet (2) to each other. In the present invention, the adhesive (3) can be peeled off by heating and is not particularly limited as long as it has such a property.

Further, in the present invention, the step of separating the substrate (1) and the decorative sheet (2) is a rough crushing step of rough crushing by a crusher, a heat separating step of separating by heating. And a specific gravity separation step for separating light and heavy ones. The order in which the rough crushing step, the heating separation step, and the specific gravity separation step are performed is not particularly limited and can be freely set and performed.

As shown in FIG. 3, the rough crushing step is a step of putting it in a crusher or the like for rough crushing, and the heat separating step is put in a dryer or the like to heat it as shown in FIG. In the specific gravity separation step, the specific gravity separation step (6) is performed by blowing the air into the specific gravity separation apparatus (6) as shown by an arrow (A) in FIG. 6 is rotated as indicated by arrow (C) to separate high specific gravity toward the lower side and low specific gravity toward the upper side as shown by the arrow (B) in FIGS. 5 and 6. Is. In the case of the ventilation type separation as shown in FIG. 5, the lid (7) is closed, the pipe (8) is inserted, and suction is made from this pipe (8). It can be made to go to the upper side. It is also possible to suck this low specific gravity material toward the pipe (8) and take out only this low specific gravity material. In the case of the present invention, the low specific gravity product is the decorative sheet (2).
Since the high specific gravity material is the wooden substrate (1), the substrate (1) and the decorative sheet (2) are separated by specific gravity separation.

According to the present invention, by adopting such a structure, when heat is applied to the wooden substrate (1) and the decorative sheet (2) which are bonded to each other with the adhesive (3), the adhesive ( The layer 3) can be easily peeled off, and the decorative sheet (2) on the surface can be easily peeled off. As a result,
The substrate (1) and the decorative sheet (2) can be separated by specific gravity separation.

That is, according to the present invention, the substrate (1) and the decorative sheet (2) joined by the adhesive (3) can be easily separated, and the recycling of resources can be facilitated. Is something that can be done.

In the usual case, the substrate (1) is regenerated into a medium density fiber substrate (MDF) or particle board, and the decorative sheet (2) can be thermally recycled by burning.

Further, when the adhesive (3) contains a heat-expanding agent having a heat-expanding property, a heat-expanding agent having such a heat-expanding property is carried out during the heat separation step. The adhesive (3) containing the resin can be more surely and smoothly peeled off by heating, and as a result, the wooden substrates bonded to each other by the adhesive (3). The decorative sheet (1) and the decorative sheet (2) can be separated more reliably and smoothly.

Specifically, the thermal expansion agent includes, for example, a foaming agent that foams when heated. As the foaming agent, either an organic type or an inorganic type can be used. Examples of the inorganic foaming agent include separation-type inorganic foaming agents such as ammonium carbonate, ammonium hydrogen carbonate, ammonium nitrite, ammonium borohydride, and azides.

As the organic foaming agent, fluorinated alkanes such as trichloromonofluoromethane, azo compounds such as azobisisobutyronitrile, hydrazine compounds such as paratoluenesulfonylhydrazide, and ρ-toluylenesulfonyl semicarbazide. Such as semicarbazide compounds, trimorph compounds such as 5-morpholyl-1,2,3,4-thiatriazole, N-nitroso compounds such as N, N′-dinitrosoterephthalamide,
Other examples include low boiling point solvents.

Further, the adhesive (3) is a vinyl type adhesive,
If the decorative wood material consisting of the substrate (1) and the decorative sheet (2) is subjected to heat treatment, it is either vinyl-based, silicon-based, or urethane-based if it is one of silicone-based or urethane-based. Since the adhesive (3), which is one type of the adhesive, is used, the adhesive (3) peels off between the substrate (1) and the decorative sheet (2) due to foaming or the like, resulting in the substrate. The decorative sheet (2) can be peeled from the (1) more easily, and the substrate (1) and the decorative sheet (2) constituting the decorative wood material can be separated and recycled more easily. Is something that can be done.

For example, as the vinyl adhesive (3), acrylic emulsion, ethylene vinyl acetate emulsion or the like can be used. As the urethane adhesive (3), polyester polyurethane emulsion, polyether polyurethane emulsion or the like can be used. As the silicone adhesive (3), various adhesives can be adopted, like the vinyl adhesive (3) and the urethane adhesive (3).

As shown in FIGS. 5 and 6, if the specific gravity separation step is a step performed by either blast type separation or centrifugal type separation, the specific gravity type is separated from the specific gravity type. In addition, the specific gravity separation step performed by either the air blow type separation or the centrifugal separation can be more reliably separated, and as a result, the specific gravity separation step can be performed more reliably. is there.

According to the method for separating a decorative wood material of the present invention,
As shown in FIGS. 1 to 6, a method of separating a decorative wood material for separating a wooden substrate (1) and a decorative sheet (2) that are bonded to each other with an adhesive (3), (3) is peelable by heating, and the step of separating the substrate (1) and the decorative sheet (2) is a rough crushing step of roughly crushing with a crusher, etc. Since the heat separation step and the specific gravity separation step for separating the light specific gravity and the heavy specific gravity are performed, the wooden substrate (1) and the decorative sheet (2) that are bonded to each other by the adhesive (3) are included. When heat is applied to and, the peeling can be easily performed with the layer of the adhesive (3), and the decorative sheet (2) on the surface can be easily peeled off.
The substrate (1) and the decorative sheet (2) can be separated by specific gravity separation.

That is, according to the present invention, the substrate (1) and the decorative sheet (2) joined by the adhesive (3) can be easily separated, and the recycling of resources can be facilitated. Is something that can be done.

[0031]

EXAMPLES Examples of the present invention will be described in detail below.

(Example 1) Size 12 with a thickness of 2.5 mm
A medium density fiber substrate (MDF) of 00 × 2400 mm is adopted as the base material portion (4), and a vinyl adhesive (3) containing a thermal expansion agent that can be peeled off by heating is applied at 80 g / m 2 to obtain a thickness. A 70 μm thick wood grain olefin sheet was adopted as the decorative sheet (2), and the base material portion (4) and the decorative sheet (2) were bonded to each other with a laminator as shown in FIG.

Next, as shown in FIG. 2, a base material portion (4) and a decorative sheet (2) which are bonded to each other is adopted as a decorative base material, and this decorative base material is subjected to a V-cut construction method to obtain wood. The core close-up material (5) was wrapped around to prepare a wound closet which was a decorative wood material as shown in FIG. In the winding closet thus produced, the substrate (1) is formed of the wood core material (5) and the base material portion (4).

The thus-obtained closet was roughly crushed by a crusher as shown in FIG. 3 and allowed to stand in a dryer at 150 ° C. for 30 minutes as shown in FIG. 4 for the substrate (1) and the decorative sheet (2). Was separated by heating, and the specific gravity separation was performed by the air blow type separation as shown in FIG. 5, whereby the substrate (1) and the decorative sheet (2) could be separated.

(Example 2) A wound closet was prepared and obtained in the same manner as in Example 1 except that a urethane-based adhesive (3) containing a heat-expanding agent that can be peeled off by heating was used. The winding closet is roughly crushed by a crusher as shown in FIG. 3 and left in a dryer at 150 ° C. as shown in FIG. 4 for 30 minutes to separate the substrate (1) and the decorative sheet (2) by heating, It was possible to separate the substrate (1) and the decorative sheet (2) by carrying out specific gravity separation by a ventilation type separation as shown in.

(Example 3) A wound closet was prepared and obtained in the same manner as in Example 1 except that the silicon-based adhesive (3) containing a thermal expansion agent that can be peeled by heating was used. The winding closet is roughly crushed by a crusher as shown in FIG. 3 and left in a dryer at 150 ° C. as shown in FIG. 4 for 30 minutes to separate the substrate (1) and the decorative sheet (2) by heating, It was possible to separate the substrate (1) and the decorative sheet (2) by carrying out specific gravity separation by a ventilation type separation as shown in.

Example 4 A winding closet was prepared in the same manner as in Example 1, and the obtained winding closet was left in a dryer at 150 ° C. for 30 minutes as shown in FIG.
The substrate (1) and the decorative sheet (2) are separated by heating,
It was possible to separate the substrate (1) and the decorative sheet (2) by performing coarse pulverization with a pulverizer as shown in FIG. 3 and performing specific gravity separation by blast separation as shown in FIG.

(Example 5) A wound closet was prepared in the same manner as in Example 1, and the obtained wound closet was roughly crushed by a crusher as shown in Fig. 3 and dried at 150 ° C as shown in Fig. 4. After leaving it in the machine for 30 minutes, the substrate (1) and the decorative sheet (2) are separated by heating, and specific gravity separation is performed by centrifugal separation as shown in FIG. 6 to separate the substrate (1) and the decorative sheet (2). I was able to do it.

(Comparative Example 1) The procedure of Example 1 was repeated except that the urethane type adhesive (3) of reaction-curing type was used.
A winding closet is prepared, and the obtained winding closet is roughly crushed by a crusher as shown in FIG. 3 and allowed to stand in a dryer at 150 ° C. for 30 minutes as shown in FIG. 4, and the substrate (1) and the decorative sheet (2 ) Is separated by heating, and FIG.
The specific gravity separation was performed by the air blow type separation as shown in
The substrate (1) and the decorative sheet (2) could not be separated.

(Comparative Example 2) A winding closet was prepared in the same manner as in Example 1 except that the reaction-curing vinyl adhesive (3) was used, and the obtained winding closet is shown in FIG. After roughly crushing with a crusher, leave it in a dryer at 150 ° C as shown in Fig. 4 for 30 minutes,
The decorative sheet (2) and the decorative sheet (2) were separated by heating, and the specific gravity separation was performed by the blast separation as shown in FIG. 5, but the substrate (1) and the decorative sheet (2) could not be separated.

In Table 1 below, Examples 1-5 and Comparative Examples 1-2
For each of the above, the adhesive (3) used, the order of the separation steps (the order of separation), and the specific gravity separation of either the blast type or the centrifugal type are described, and the separability is described as an evaluation. When separation was possible, it was indicated by ○, and when separation was not possible, it was indicated by ×.

[0042]

[Table 1]

As can be seen from Table 1, the separability as the evaluation result is higher than that of Comparative Examples 1 and 2 in which the reaction-curable adhesive (3) is used, and the heat which can be peeled off by heating. Example 1 employing an adhesive (3) containing a swelling agent
5 are obviously good, and when heat is applied to the wooden substrate (1) and the decorative sheet (2) which are bonded to each other with the adhesive (3), peeling occurs at the layer of the adhesive (3). And the decorative sheet (2) on the surface can be easily peeled off, and as a result, the substrate (1) and the decorative sheet (2) are removed.
It can be said that and can be separated by specific gravity separation.

That is, according to the present invention, it is possible to easily separate the substrate (1) and the decorative sheet (2), which are joined by the adhesive (3) which can be peeled by heating, to reuse resources. Can be said to be easy.

[0045]

According to the method for separating a decorative wood material according to claim 1 of the present invention, heat is applied to the wooden substrate (1) and the decorative sheet (2) which are bonded to each other by the adhesive (3). Once added, the layer of adhesive (3) can be easily peeled off,
The decorative sheet (2) on the surface can be easily peeled off,
As a result, the substrate (1) and the decorative sheet (2) can be separated by specific gravity separation.

That is, according to the present invention, the substrate (1) and the decorative sheet (2) joined by the adhesive (3) can be easily separated, and the recycling of resources can be facilitated. Is something that can be done.

According to the method for separating a decorative wood material according to a second aspect of the present invention, in addition to the case of the first aspect, a heat-expanding agent having such a heat-expanding property is used when the heat-separating step is performed. The adhesive (3) contained therein is more surely and smoothly peeled off by heating, and as a result, the wooden substrates (joined with each other by the adhesive (3) ( The decorative sheet (1) and the decorative sheet (2) can be separated more reliably and smoothly.

According to the method for separating a decorative wood material according to claim 3 of the present invention, in addition to the case of claim 1 or 2, a decorative wood material comprising a substrate (1) and a decorative sheet (2). When the heat treatment is performed on the above, since the adhesive (3) which is one of vinyl-based, silicon-based, and urethane-based is used, the adhesive (3) is applied to the substrate (1) and the decorative sheet ( 2), the foam is peeled off from the substrate (1), and as a result, the decorative sheet (2) can be more easily peeled from the substrate (1), and the substrate (1 constituting the decorative wood material is formed. ) Or the decorative sheet (2) can be separated and recycled more easily.

According to the method for separating a decorative wood material according to a fourth aspect of the present invention, in addition to the case of any one of the first to third aspects, in order to separate a light specific gravity material and a heavy specific material, The specific gravity separation step performed by either the air blow type separation or the centrifugal type separation is more reliably performed, and as a result, the specific gravity separation step can be performed more reliably.

[Brief description of drawings]

FIG. 1 is a perspective view showing a decorative wood material according to an embodiment of a method for separating a decorative wood material of the present invention.

FIG. 2 is a perspective view showing a decorative wood material according to another embodiment of the method for separating a decorative wood material of the present invention.

FIG. 3 is a schematic view showing a rough crushing step according to one embodiment in the method for separating a decorative wood material of the present invention.

FIG. 4 is a schematic view showing a heating separation step according to one embodiment in the method for separating a decorative wood material of the present invention.

FIG. 5 is a schematic view showing blast type separation in a specific gravity separation step according to one embodiment in the method for separating decorative wood material of the present invention.

FIG. 6 is a schematic view showing centrifugal separation in a specific gravity separation step according to one embodiment in the method for separating decorative wood material of the present invention.

[Explanation of symbols]

1 substrate 2 makeup sheets 3 adhesive

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) B29B 17/02 B09B 3/00 Z 303Z (72) Inventor Kazuo Seto 1048 Kadoma, Kadoma-shi, Osaka Matsushita Electric Works Stock Company F-term (reference) 4D004 AA31 BA02 BA03 CA04 CA12 CA22 4D021 FA12 FA25 GA14 GB02 HA10 4F301 AA12 BE01 BE08 BE32 BF02 BF09 BF12 BF31

Claims (4)

[Claims] 1. A method for separating a decorative wood material for separating a wooden substrate and a decorative sheet that are bonded to each other with an adhesive, wherein the adhesive is peelable by heating. And a step of separating the decorative sheet from a rough crushing step of roughly crushing with a crusher, a heat separating step of separating by heating, and a specific gravity separating step of separating a light specific gravity and a heavy specific gravity. A method for separating decorative wood materials, which is characterized in that 2. The adhesive contains a heat-expanding agent having a heat-expanding property.
The method for separating the decorative wood material described. 3. The adhesive is vinyl-based, silicon-based,
Alternatively, the method for separating a decorative wood material according to claim 1 or 2, wherein the method is one of urethane type. 4. The method for separating a decorative wood material according to any one of claims 1 to 3, wherein the specific gravity separation step is a step that is performed by either a blast separation or a centrifugal separation.