JP4519305B2 - How to recycle the top board - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for recycling a top plate comprising a wood-based core material, a resin surface plate, and a resin edge material.
[0002]
[Prior art]
In recent years, from the viewpoint of environmental protection, interest in the environment such as prevention of global warming and effective use of resources has increased.
[0003]
Currently used tabletops such as tables generally use a particle-based core material such as a particle board or MDF that uses end materials produced during lumbering, and the top plate surface that constitutes the exterior. Since various resin materials are used for the edge material, and these wood and resin material are integrally formed, various harmful substances are released into the atmosphere when the top plate is disposed of by incineration, for example. It has a problem of polluting the environment, such as being released into the environment.
[0004]
As a method for recycling such a top board, for example, there is a method described in Japanese Patent Application Laid-Open No. 2000-158420 filed and published by the present applicant. In this invention, the wood core excluding the resin rim material is used. It is related to the top plate composed of the material and the resin surface plate.For the top plate having the resin rim material, it is necessary to separate the resin rim material before applying the top plate to the defibrating machine. Since all the members are integrated, this separation work is very complicated and takes time.
[0005]
Further, for example, when the top plate integrated with the resin edge material is recycled by the method described in the above publication without removing the resin edge material, the resin edge material is made of a thermosetting resin. In some cases, unevenness may occur on the surface of the molded product, and smoothness may not be obtained, and it may be difficult to use depending on the purpose of use of the molded product.
[0006]
[Problems to be solved by the invention]
The present invention has been made paying attention to such a problem, and provides a top plate recycling method that can be recycled by directly putting it into a crusher without separating the resin edge of the top plate and the like. The purpose is to do.
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the top board recycling method of the present invention is a top board recycling method comprising a wood-based core material, a resin surface board, and a resin edge material, and the top board is pulverized by a pulverizer. In addition to making the top plate pulverized material, the weight ratio of the powder of the top plate pulverized material by 3-8 mm is 50% or more and less than 3 mm is less than 50%, and adheres to the top plate pulverized material. An agent is added and the whole is mixed almost uniformly, and the mixture is formed into a predetermined shape.
According to this feature, it is possible not only to remove foreign substances such as metal attached to the top plate, but to pulverize the resin rim material without separation, so that it can be easily recycled. When a large amount of pulverized material is used in large quantities, the adhesion between the pulverized materials is impaired, and when a large amount of pulverized material of less than 3 mm is used, Since the strength may be remarkably lowered, the molded product can obtain a strength suitable for use by setting the mixing weight ratio of the pulverized material to the above ratio.
[0008]
According to the recycling method of the top plate of the present invention, the weight ratio of the top plate to be used is 75 to 90% for the wood-based core material, and 10 to 10 for the resin material composed of the resin surface plate and the resin edge material. It is preferably 25%.
If it does in this way, the intensity | strength of the molded article shape | molded by recycling can further be raised.
[0009]
The recycling method of the top plate of the present invention is a method of recycling using both a top plate using a thermoplastic resin as the resin edge material and a top plate using a thermosetting resin , The top plate of the top plate using a thermoplastic resin is made so that the size of the powder of the top plate pulverized material is 3 to 8 mm, and the top plate of the top plate using a thermosetting resin as the resin edge material. It is preferable that the size of the powder of the pulverized material is 1 mm or less, an adhesive is added to the crushed material on both top plates, the whole is mixed almost uniformly, and the mixture is formed into a predetermined shape.
In this way, most of the mixing ratio of the pulverized material is the pulverized material of the top plate using the thermoplastic resin, so that the thermosetting resin that is not softened by heating is recycled on the surface of the molded product. Since it does not protrude greatly to form irregularities, a molded product having a smooth surface can be obtained.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
(First embodiment)
Embodiments of the present invention will be described below with reference to the drawings. First, FIG. 1 is a cross-sectional view showing a configuration of a top plate used in a top plate recycling method, and FIG. 2 is a first embodiment of the present invention. FIG. 3 is a process flow diagram showing each step of the top plate recycling method, and FIG. 3 is a side cross-sectional view showing a coating apparatus that applies an adhesive to a crushed top plate.
[0011]
First, the top plate 1 used in the present embodiment is generally used for a table, a desk, or the like, and includes a wood-based core material constituting the inside, a resin surface plate constituting the surface portion, and an edge of the top plate. It is comprised from the resin edge part to comprise, and these are comprised integrally.
[0012]
The wood-based core material is formed from a small piece of wood and resin, and includes a particle board 2 disposed at the center of the top plate, and a laminated material such as MDF 3 disposed so as to surround the particle board 2. It is configured.
[0013]
The resin surface plate includes a melamine decorative plate 5 made of a melamine resin and a phenol resin adhered to the upper surface of the plywood 8 bonded to the upper portion of the wooden core material, and a lower surface of the wooden core material. And a phenol plate 7 made of phenol resin.
[0014]
The rim material is configured as a resin rim material 4 as a resin rim material 4 by a thermoplastic resin such as an olefin resin or vinyl chloride, and is provided over the peripheral surface of the top plate 1 so as to protect the top plate 1 from impact. It is attached.
[0015]
Next, the process of recycling the top plate 1 will be described with reference to FIG. 2. First, metal and foreign matters such as metal fittings attached to the top plate 1 are removed, and a sieve having an opening of 3 to 8 mm is used. Put the top plate into the pulverizer, and crush the top plate. At this time, it goes without saying that the charging may be performed after appropriately cutting into a size that can be processed by a pulverizer.
[0016]
Then, the crushed top plate pulverized material is divided into those having a size of 3 to 8 mm and those having a size of 3 mm or less, and 3 to 8 mm of the top plate pulverized material accounts for 50% or more of the total weight, and the remaining 3 mm. As the following top plate pulverized material occupies, for example, mixing is performed such that 3 to 8 mm occupies 75% of the total weight and less than 3 mm occupies the remaining 25%.
[0017]
Here, as a reason for setting the size of one top plate pulverized material to 3 to 8 mm, for example, when molding using a top plate pulverized material pulverized with a pulverizer using a sieve having an opening of less than 3 mm, Since the particles of the crushing material for the top plate are small, the obtained molded product is insufficient in strength as compared with the case where the particle board 2 is used as the core material.
[0018]
In addition, when the top plate pulverized material pulverized with a pulverizer using a sieve having an opening larger than 8 mm is used, there is no problem with the particle size of the top plate pulverized material. Becomes worse and it becomes difficult to mold the molded product.
[0019]
Next, a urea resin as an adhesive is pulverized by a pulverizer and mixed with 75% of the weight of 3 to 8 mm and 75% of the size of less than 3 mm at a weight ratio of 25%. In order to apply | coat this, an adhesive agent is apply | coated with an application | coating apparatus as shown in FIG.
[0020]
The configuration of the coating apparatus 10 used in the present embodiment will be described with reference to FIG. 3. The main body housing 16 is formed in a substantially cylindrical shape having an input port 11 at an upper position and a discharge port 15 at a lower position. Inside, a shaft 12 provided with a stirring blade 13 and a rod-like discharge nozzle 14 is supported so as to rotate at high speed by a drive motor (not shown).
[0021]
The inside of the shaft 12 is hollow and communicates with the discharge nozzle 14, and an adhesive is pumped into the hollow interior.
[0022]
The state of application of the adhesive in the coating device 10 will be described. The top plate pulverized material is introduced into the housing 16 from the charging port 11 and is centrifugally moved to the inner wall of the housing 16 by the high-speed rotating stirring blade 13. While being formed, it is stirred and moves downward.
[0023]
At this time, the adhesive pumped into the hollow interior of the shaft 12 is centrifugally ejected from the tip of the discharge nozzle 14 and continuously applied to the mixture on the inner wall of the housing 16. It is discharged from the discharge port 15.
[0024]
The top plate pulverized material to which the adhesive is applied by the coating device 10 is sent to a mixing device (not shown), mixed so as to be in a substantially homogeneous state, and is then applied to a previously prepared molding die. After feeding the homogenized adhesive-coated top plate pulverized material, it is pressurized and heated under the conditions of 15-30 kgf / cm ² pressure and 80-180 ° C., and solidified after cooling. The molded product is taken out from the mold and used as a molded product. The molded product is mainly used as a core material for the top plate.
[0025]
If the method of the present embodiment is used, foreign matters such as metal attached to the top plate 1 are removed, and the resin rim material 4 and the like can be easily pulverized without being separated, and can be easily recycled. In addition, when a large amount of pulverized material larger than 8 mm is used, the adhesion between the pulverized materials is impaired, and when a large amount of pulverized material of less than 3 mm is used, recycling may occur. Since the strength of the molded product that has been molded may be significantly reduced, the molded product can be reduced by adjusting the mixing weight ratio of the pulverized material to 3-8 mm from 50% to less than 3 mm. The strength suitable for the use of the core material of the plate can be obtained.
[0026]
(Second embodiment)
Next, when the resin material used as the resin rim material can be separated by the thermoplastic resin and the thermosetting resin, when the top plate using each resin rim material is mixed and recycled. The process will be described with reference to FIG.
[0027]
First, as in the first embodiment, foreign substances such as metal are removed, and then a top plate using a thermoplastic resin as a resin rim material and a top plate using a thermosetting resin are separated.
[0028]
The top plate using a thermoplastic resin as the resin edge material is pulverized by putting the top plate into a pulverizer using a sieve having a mesh opening of 3 to 8 mm.
[0029]
A resin rim material using a thermosetting resin is pulverized by putting the top plate into a pulverizer using a sieve having a mesh opening of 1 mm.
[0030]
Next, the top plate pulverized material using the pulverized thermoplastic resin and the top plate pulverized material using the thermosetting resin, for example, 90% of the thermoplastic resin and 10% by weight of the thermosetting resin. Mix with.
[0031]
Since the subsequent steps are the same as those in the first embodiment, they are omitted.
[0032]
Thus, the difference between this example and the first example is that in the first example, regardless of the type of resin used for the rim material of the top plate, all of them are 3-8 mm in size with a pulverizer. Although it is pulverized, in this example, while separating the top plate according to the type of resin used for the edge material of the top plate, and using a thermoplastic resin for the edge material of the top plate, The thing which grind | pulverizes to 3-8 mm, grind | pulverizes to 1 mm or less using the thermosetting resin, and is a point which uses the top plate grinding material using a thermoplastic resin at least 50% or more by weight ratio.
[0033]
In this example, the mixing weight ratio of the top plate pulverized material using the thermoplastic resin as the edge material and the top plate pulverized material using the thermosetting resin is 90% using the thermoplastic resin, thermosetting. However, by increasing the proportion of the crushing material using the thermoplastic resin as much as possible, it becomes easy to obtain a molded product having a smooth surface.
[0034]
This is because the thermosetting resin does not soften even when heated and pressed under the above-mentioned conditions, and when the mixing ratio when mixed with the thermoplastic resin is large, the resin remains in a granular form on the surface of the molded product. This is because large irregularities may occur.
[0035]
Therefore, when a molded product obtained by recycling is used, for example, as a core material in the top plate, it is preferable that the surface of the molded product is smooth. If smoothness is not particularly required, the weight ratio of the top board pulverized material using a thermosetting resin should be kept to a minimum of less than 50%, and the top board crushed using a thermoplastic resin depending on the intended use of the molded product By changing the blending ratio of the material and the top plate pulverized material using the thermosetting resin, it is possible to produce molded articles for various purposes.
[0036]
In addition, the weight ratio according to the material of the top plate used in the first embodiment and the second embodiment is composed of 75% to 90% of a wood-based core material, a resin surface material, a resin edge material, and the like. The resin-based material is preferably 10 to 25%, and when the top plate having the above weight ratio is used, the strength of the molded product can be further increased.
[0037]
Although the embodiments of the present invention have been described with reference to the drawings, the specific configuration is not limited to these embodiments, and modifications and additions within the scope of the present invention are included in the present invention. It is.
[0038]
For example, in the above-described embodiment of the present invention, urea resin is used as the adhesive, but the present invention is not limited to this, and is generally used for bonding particle boards and the like. Any material may be used as long as it is urea, and any urea-based adhesive, urea-based adhesive, phenol-based adhesive, urethane-based adhesive, etc., including urea can be used.
[0039]
Further, in the above embodiment, particle board and MDF are used as the wood-based core material, but the present invention is not limited to this, and all of them are composed of MDF or only wood. Alternatively, a paper honeycomb or the like may be used, and if it is made of a material generally used for a table or the like, it can be recycled. This is the same even when the resin surface plate using the melamine decorative plate is used. If a resin capable of forming the surface of the top plate such as vinyl chloride is used, it can be recycled.
[0040]
【The invention's effect】
The present invention has the following effects.
[0041]
(A) According to the invention of claim 1, it is possible to easily recycle by removing foreign substances such as metal attached to the top plate and pulverizing the resin rim material without separation. In addition, when a large amount of pulverized material larger than 8 mm is used, the adhesiveness between the pulverized materials is impaired, and when a large amount of pulverized material of less than 3 mm is used, it is molded by recycling. Since the strength of the molded product may be remarkably lowered, the molded product can obtain strength suitable for use by setting the mixing weight ratio of the pulverized material to the above ratio.
[0042]
(B) According to invention of Claim 2, the intensity | strength of the molded article shape | molded by recycling can be raised.
[0043]
(C) According to the invention of claim 3, a thermosetting resin that is not softened by heating is formed by recycling by making most of the mixing ratio of the pulverized material a pulverized material for the top plate using a thermoplastic resin. Since the surface of the molded product is not raised and unevenness is not formed, a molded product having a smooth surface can be obtained.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a configuration of a top board used in a top board recycling method to which the present invention is applied.
FIG. 2 is a process flow diagram showing each process of a top plate recycling method according to the first embodiment of the present invention.
FIG. 3 is a side sectional view showing a coating apparatus that applies an adhesive to a crushed top plate.
FIG. 4 is a process flow diagram showing each process of a top plate recycling method according to a second embodiment of the present invention.
[Explanation of symbols]
1 Top plate 2 Particle board (woody core)
3 MFD (woody core material)
DESCRIPTION OF SYMBOLS 4 Resin edge material 5 Melamine decorative board 6 Adhesive 7 Phenol board 8 Plywood 10 Application apparatus 11 Input port 12 Shaft 13 Stirring blade 14 Discharge nozzle 15 Discharge port 16 Housing

Claims (3)

A method of recycling a top plate comprising a wood-based core material, a resin surface plate, and a resin edge material. The weight ratio of 3 to 8 mm is 50% or more, and less than 3 mm is less than 50%, and the whole is mixed almost uniformly by adding an adhesive to the crushing material for the top plate. A method of recycling the top board, characterized in that it is molded into a glass. The weight ratio according to material of the top plate used is 75 to 90% for a wood-based core material, and 10 to 25% for a resin-based material composed of a resin surface plate and a resin edge material. How to recycle the top board. A recycling method using both a top board using a thermoplastic resin for the resin edge material and a top board using a thermosetting resin, wherein the top of the top board using a thermoplastic resin for the resin edge material. The size of the powder of the board pulverized material is 3 to 8 mm, and the size of the powder of the crushed powder of the top board using a thermosetting resin as the resin edge material is 1 mm or less. The method for recycling a top plate according to claim 1 or 2, wherein an adhesive is added to both the top plate pulverized materials, the whole is mixed substantially uniformly, and the mixture is formed into a predetermined shape.

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