JP2003211519A - Wood flour/resin composite material and method for manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rationalized method for manufacturing a wood flour/resin composite material, capable of completing moisture conditioning efficiently in a short time and capable of contributing to energy saving and space saving, and the wood flour/resin composite material manufactured by the manufacturing method. <P>SOLUTION: The water retention materials supplied from rolls 3 are laminated on both surfaces of the wood flour/resin composite material 2 being a continuous plate-shaped body extruded from an extruder 1 and water or hot water is sprinkled over or applied to both surfaces of the wood flour/resin composite material 2 by water adding devices 10 through rolls 5, 6, 7, 8 and 9. Therefore, water is held to the water retention materials 4 laminated to the outer surfaces of the wood flour/resin composite material 2 and the whole of the outer surfaces of the wood flour/resin composite material 2 is conditioned in moisture uniformly and efficiently and, since the wood flour/resin composite material 2 is already uniformly heated by the heat at the time of molding of the extruded sheet, this method is advantageous from an aspect of energy efficiency and more uniform moisture conditioning can be realized. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a method for producing a wood powder resin composite material and a wood powder resin composite material.

[0002]

2. Description of the Related Art Generally, a wood powder resin composite material immediately after being manufactured by extrusion sheet molding is such that water vaporizes when it is pressed in a high temperature extrusion sheet molding process and, after cooling, the wood powder resin composite material. The moisture content of the composite material is much lower than the equilibrium moisture content with the atmosphere, and if such wood powder resin composite material is cut and cut as it is, it will absorb moisture thereafter.
Since the water content partially changes, there is a problem that the dimensional stability is deteriorated. Therefore, conventionally, there has been a need for a step of adjusting the humidity of the wood powder resin composite material extruded into a sheet again.

Specifically, curing is performed at room temperature (hereinafter, humidity control in a curing chamber, which will be described later, is referred to as "curing"). After extrusion sheet molding, again to wood powder resin composite material,
Sprinkle or apply water. The humidity was controlled by the above.

However, since the wood powder resin composite itself is a material in which the diffusion of water inside is slow, and the thermal conductivity is low, the curing period is
It takes a few weeks, and the normal temperature wood powder resin composite material,
Even if water is sprayed or applied, it takes a long time for the whole to be uniformly conditioned, and even if the wood powder resin composite material is reheated, the temperature rises to the inside of the wood powder resin composite material. It took a long time to complete, and there was a problem that the efficiency was poor by any method.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to complete humidity control efficiently in a relatively short time, and also to save energy. It is an object of the present invention to provide a streamlined method for producing a wood powder resin composite material which can contribute to space saving and a wood powder resin composite material produced thereby.

[0006]

In order to solve the above problems, in the method for producing a wood powder resin composite material according to the first aspect of the present invention, wood powder and a thermoplastic resin are blended by extrusion sheet molding. The method for producing a wood powder resin composite material is characterized by comprising a humidity control process of spraying or applying water to the wood powder resin composite material in the extrusion sheet forming step.

According to a second aspect of the present invention, there is provided a method for producing a wood powder resin composite material according to the first aspect, wherein the wood powder resin composite material has a water-retaining property on its outer surface. It is characterized by being a plate-shaped body in which materials are laminated.

According to a third aspect of the present invention, there is provided a method for producing a wood powder resin composite material according to the first or second aspect, wherein the water retentive material is paper. It is characterized by being.

According to a fourth aspect of the present invention, there is provided a method for producing a wood powder resin composite material according to any one of the first to third aspects of the present invention. Is polypropylene.

According to a fifth aspect of the present invention, there is provided a method for producing a wood powder resin composite material according to any one of the first to fourth aspects of the present invention. The composite material is placed in a temperature- and humidity-controlled curing room after being sprayed or coated with water.

A wood powder resin composite material according to a sixth aspect of the present invention is manufactured by the method for manufacturing a wood powder resin composite material according to any one of the first to fifth aspects. It is a thing.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. Incidentally, the method for producing the wood powder resin composite material 2 according to the present invention is not limited to the following embodiments, and it goes without saying that various modifications can be made without departing from the gist of the present invention. . Here, FIG. 1 is a diagram showing an outline of a method for producing the wood powder resin composite material 2 of the present invention. FIG. 2 is a sectional view showing an outline of the wood powder resin composite material 2 manufactured by the method for manufacturing the wood powder resin composite material 2 of the present invention.

That is, the method for manufacturing the wood powder resin composite material 2 of the present invention is as follows. As shown in FIG.
Wood powder resin composite material 2 (hereinafter,
It is called "wood powder resin composite board 2a". ) Is laminated on both sides thereof with the water-retaining material 4 supplied from the roll 3, and then water or hot water is sprayed or applied by the water addition device 10 via the rolls 5, 6, 7 and 8, 9. . The water addition device is not particularly limited, but preferably a roll coater, a flow coater, a sponge roll, or the like can be used. After that, the wood powder resin composite plate 2a is cut into a predetermined size and placed in a temperature-humidity-controlled curing chamber 11 (see FIG. 3) for a predetermined time to ensure a predetermined water content.

Here, the water-retaining material 4 is not particularly limited as long as it is a flexible surface material capable of retaining water, and a cloth,
Paper, non-woven fabric, etc. are exemplified, but paper 4a is preferably used. This is because if the paper 4a, which is a general-purpose material that is easy to procure, is used, the humidity can be adjusted economically. Examples of the paper 4a that can be used include desiccant bag base paper (manufactured by Maruhishi Papertech Co., Ltd.), but any paper that has sufficient water retention performance and strength can be used and contributes to solving the above problems. It goes without saying that there are no restrictions as far as I can get. Further, FIG. 1 illustrates an embodiment in which the wood powder resin composite plate 2a extruded from the extruder 1 for extrusion sheet molding is laminated with the water retaining material 4 supplied from the roll 3 on both surfaces thereof. However, it goes without saying that an embodiment in which the water-retaining material 4 is laminated on only one surface of the wood powder resin composite plate 2a is naturally possible and there is no restriction as long as it can contribute to the solution of the above problems. .

On the other hand, as described above, conventionally, the wood powder resin composite material 2 extruded into a sheet has to be reconditioned. However, since the wood powder resin composite material 2 itself is a material in which the diffusion of water inside is slow and the thermal conductivity is low, when it is cured at room temperature as it is in the curing room 11, the curing period is long. It takes several weeks, and even if water is actively sprayed or applied to the wood powder resin composite material 2 at room temperature, it takes a long time for the whole to be uniformly conditioned, Furthermore, even if the wood powder resin composite material 2 is reheated to accelerate the diffusion of moisture, this time,
It takes a long time to uniformly raise the temperature to the inside of the wood powder resin composite material 2, and there is a problem that the efficiency is poor in any method.

From this point of view, according to the method for producing the wood powder resin composite material 2 of the present invention, the wood powder resin composite material 2 which is the wood powder resin composite material 2 is sufficiently warm during the extrusion sheet forming step. In the state, water or warm water is sprayed or applied, so there is no need to heat again only for humidity control,
It can be said to be advantageous in terms of energy efficiency.

Further, unlike the case of the above-mentioned reheating, according to the method for producing the wood powder resin composite material 2 of the present invention, the wood powder resin composite plate 2a is already in the extrusion sheet forming step, so that it is already uniform. Since it is heated to 1, it is possible to achieve more uniform humidity control.

In addition to this, the wood powder resin composite material 2 of the present invention
According to the manufacturing method of 1., the wood powder resin composite board 2a is one in which a water-retaining material 4, in particular paper 4a, is laminated on the outer surface. Evenly over the entire outer surface of the composite plate 2a on which the paper 4a is laminated,
The role of maintaining and supplying moisture for a long period of time sufficient to complete the curing by putting the curing chamber 11 in a temperature / humidity controlled room 11 for a predetermined time so that the humidity can be controlled evenly and efficiently. Will be possible.

That is, as will be described later, the wood powder resin composite plate 2
a contains a highly hydrophobic olefinic thermoplastic synthetic resin component and the like, and has inherently high water repellency, and in addition, the wood powder resin composite plate 2a has a fine surface. When the wood powder resin composite plate 2a has a deformation such as a warp or a swell, even if water or warm water is evenly sprayed or applied directly on the wood powder resin composite plate 2a, thereafter, there is a tendency that the wood powder resin composite plate 2a is localized at a specific site or runs away. This is because it is difficult to hold and supply water uniformly and evenly to the entire surface on which water or warm water is sprayed or applied.

In other words, the method for producing the wood powder resin composite material 2 of the present invention can efficiently control the humidity of the wood powder resin composite material 2 having a material structure which is hydrophobic and highly water repellent. It can be said that

The wood powder resin composite material 2 represented by the wood powder resin composite plate 2a manufactured by the method for manufacturing the wood powder resin composite material 2 of the present invention is a mixture of wood powder and a thermoplastic resin. A typical example is a kneaded molded product of at least polypropylene and wood flour. Needless to say, it is produced by the method for producing the wood flour resin composite 2 of the present invention. The possible wood powder resin composite material 2 is not limited to this, and there is no particular limitation. However, it is preferable that the mixing ratio of wood powder to the total amount of wood powder resin composite 2 is 2
It is preferably from 0 to 70% (mass ratio), and is manufactured by extrusion sheet molding at such a compounding ratio. The particle size of wood powder is preferably 100 mesh or less. Further, as the thermoplastic resin to be blended, for example, an olefinic thermoplastic synthetic resin such as polypropylene or polyethylene can be preferably used. In addition to the wood flour and the thermoplastic synthetic resin, the wood flour resin composite material 2 produced by the method for producing the wood flour resin composite material 2 of the present invention includes a thermoplastic synthetic resin modified with an acid anhydride. Resin may be added,
If necessary, an inorganic substance may be added in addition to this.

FIG. 2 is a sectional view showing an outline of a wood powder resin composite plate 2a (wood powder resin composite material 2) manufactured by the method for manufacturing the wood powder resin composite material 2 of the present invention. Here, the wood powder resin composite plate 2a is a plate-like body made of a kneaded molded product of polypropylene and wood powder (containing 40 mass% of wood powder), and has a thickness of 30 mm, 1800 mm × 300 mm. Paper that has been cut and has a thickness of 0.1 mm on both front and back sides is a desiccant bag base paper [Maruhishi Papertech Co., Ltd.
Product] is laminated. When this is extruded from an extruder 1 for extruding sheet forming as shown in FIG. 70 to 90 g for one wood powder resin composite plate 2a
It was found that it can retain the water content of. On the other hand, paper 4
When a was not laminated, it could only hold 10 to 20 g of water.

After the water is applied by the water adding device 10, the cut wood powder resin composite plate 2a is put into the curing chamber 11 in which the humidity is kept at 90% at a predetermined temperature and is cured. . FIG. 3 is a diagram schematically showing the outline of the curing inside the curing chamber 11. That is, inside the curing chamber 11, a wood powder resin composite plate 2a having paper 4a laminated on both sides
(Hereinafter, referred to as "laminated composite plate 12".) 100 pieces are stacked and placed on the pallet 13, and a 1200 kg weight 14 is placed on the top (that is, under a pressure of about 0.02 kgf / cm ² ) and set. It is to maintain the environment in which the humidity at temperature is 90%.

Table 1 shows the laminated composite plate 12 with a surface temperature of 50.
It shows the relationship between the curing period and the curing achievement rate when water is applied by the water addition device (sponge roll) 10 at ℃, and shows the dimensional changes at the start of curing and at the completion of curing at the curing (temperature and humidity) conditions. It is used as an index. That is, the curing achievement rate in this case is indicated by the dimensional change rate [%] when the dimensional change at the start of curing is 0% and the dimensional change at the completion of curing under the curing (temperature and humidity) conditions is 100%. .

[0025]

[Table 1] As a result, for example, if you cure at 80 ℃, 90% humidity,
Curing is completed in about 2 days, whereas 25 ° C and 90% humidity
It is understood that under the conditions of (1), it remains still around 50% even after 20 days. Further, from this, it is understood that if the curing conditions are appropriately set and the curing is performed under such optimized conditions, the curing can be completed efficiently, without requiring a large space, and in a short time.

On the other hand, the wood powder resin composite material 2 manufactured by the method for manufacturing the wood powder resin composite material 2 of the present invention has such characteristics that it can be cured efficiently and in a short time, and the dimensional change is small. It can be said to have.

[0027]

As described above, in the method for manufacturing the wood powder resin composite material according to the first aspect of the present invention, the wood powder resin composite in which the wood powder and the thermoplastic resin are blended by extrusion sheet molding is used. A method of manufacturing a material, characterized by having a humidity control process of spraying or applying water to the wood powder resin composite material in the extrusion sheet forming step, so that the wood powder resin composite material,
Since it is already uniformly heated by the heat at the time of forming the extruded sheet, it is advantageous in terms of energy efficiency and has an excellent effect that more uniform humidity control can be realized.

According to a second aspect of the present invention, there is provided a method for producing a wood powder resin composite material according to the first aspect, wherein the wood powder resin composite material is water-retentive on the outer surface. As it is characterized by being a plate-shaped body in which materials are laminated, the entire outer surface of the plate-shaped body can be uniformly and efficiently regulated in humidity, and for a long time enough to complete curing, It has an excellent effect of retaining and supplying water.

According to a third aspect of the present invention, there is provided a method for producing a wood powder resin composite material according to the first or second aspect, wherein the water retentive material is paper. Since it is characterized in that it has an excellent effect that the humidity can be controlled economically advantageously by using a general-purpose material that is easily procured.

According to a fourth aspect of the present invention, there is provided a method for producing a wood powder resin composite material according to any one of the first to third aspects, wherein the thermoplastic resin is the thermoplastic resin. However, since it is made of polypropylene, the wood powder resin composite material having a hydrophobic and highly water-repellent material composition can efficiently perform humidity control.

According to a fifth aspect of the present invention, there is provided a method for producing a wood powder resin composite material according to any one of the first to fourth aspects of the present invention. The composite material is characterized by being placed in a curing room where the temperature and humidity are controlled after spraying or applying water, so it can be cured under optimized conditions efficiently, in a large space, and in a short time. It has an excellent effect that it can be done.

A wood powder resin composite material according to a sixth aspect of the present invention is manufactured by the method for manufacturing a wood powder resin composite material according to any one of the first to fifth aspects. Therefore, it has an excellent effect that it is efficiently cured and the dimensional change is small.

[Brief description of drawings]

FIG. 1 is a diagram showing an outline of a method for producing a wood flour resin composite material of the present invention.

FIG. 2 is a cross-sectional view showing an outline of a wood powder resin composite material manufactured by the method for manufacturing a wood powder resin composite material of the present invention.

FIG. 3 is a diagram schematically showing an outline of curing in the curing chamber.

[Explanation of symbols]

1 extruder 2 Wood powder resin composite 2a Wood powder resin composite board 3 rolls (water retention material 4) 3a Laminated paper roll 4 Water retention material 4a paper 5 rolls 6 rolls 7 rolls 8 rolls 9 rolls 10 Water addition device 11 curing room 12 laminated composite board 13 pallets 14 Weight

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) E04C 2/24 E04C 2/24 Z // B29K 101: 12 B29K 101: 12 401: 00 401: 00 B29L 9 : 00 B29L 9:00 (72) Inventor Masasuke Tsukamoto 1048 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Works Co., Ltd. F-term within the company (reference) 2B260 AA12 BA02 BA15 BA18 CA10 DA07 DA18 EB11 EB23 2E162 CC06 CD04 FC04 4F100 AK01B AK07B AP00B BA03 BA06 CA23B DE01B DE01H DG10A DG10C EH17 EJ58 EJ98 JL04 4F207 AA11 AB11 AB19 AD08 AE05 AG01 AG03 AH46 KA01 KA17 KW50

Claims (6)

[Claims] 1. A method for producing a wood powder resin composite material in which wood powder and a thermoplastic resin are blended by extrusion sheet molding, which comprises spraying water on the wood powder resin composite material during the extrusion sheet forming step or A method for producing a wood powder resin composite material, comprising a humidity control process of applying. 2. The method for producing a wood powder resin composite material according to claim 1, wherein the wood powder resin composite material is a plate-like body having a water retaining material laminated on an outer surface thereof. 3. The method for producing a wood powder resin composite material according to claim 1, wherein the water-retaining material is paper. 4. The method for producing a wood powder resin composite material according to claim 1, wherein the thermoplastic resin is polypropylene. 5. The wood flour according to claim 1, wherein the wood flour resin composite is sprayed or coated with water and then placed in a temperature and humidity controlled curing room. Method for manufacturing resin composite material. 6. A wood-powder resin composite material manufactured by the method for manufacturing a wood-powder resin composite material according to any one of claims 1 to 5.