JPH10264109A - Weather-resistant orientated strand board constructional material, processing method and device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the weather ability of an oriented strand board(OSB) which is thermally molded under pressure of wood splinter strands with a synthetic resin, and expand the scope of use applications of the OBS. SOLUTION: An orientated strand board constructional material (OSB) which is delivered from its place of origin and maintains its specified measurements at a content of moisture of about 2%, is heated and moisturized in a moisturizing chamber 1 in such a manner that a water-resistant synthetic resin adhesive used for the molding and hardening of OSB is qualitatively not deteriorated. Further, the OSB is caused to develop a dimensional distortion by the absorption of moisture through setting the moisture content at 8-13% as far as the center, and is again out to the specified dimensions at a normal temperature under a normal pressure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an oriented strand board (OS) used as a wooden building material.
B. More specifically, OSB imported products obtained by laminating layers oriented in a certain direction of a group of thin fixed wood pieces (strands) obtained by cutting raw wood in different orientations, and pressing and bonding with a water-resistant synthetic resin material. The present invention relates to a method and apparatus for processing so that it can be effectively used as a surface building material even in a hot and humid area, and a product thereof.

[0002]

2. Description of the Related Art Oriented, strand board (Ori)
The ented Strand Board) peels the cut logs, turns them into standard strands (thin pieces of wood) with a cutting machine, dries the group of strands to a moisture content of 2% to increase the adhesiveness, and then applies a water-resistant adhesive (liquid Phenol resin) is supplied in the form of a mist to impart adhesiveness to the entire peripheral surface of each strand, and then, as shown in FIG.
A layer P ₁ in which one group is oriented only in the vertical direction (process flow direction),
A laminated plate of layers P ₂ and P ₃ oriented only in the horizontal direction and a layer P ₄ oriented only in the vertical direction, and the laminated plate is heated and pressurized and solidified with a water-resistant synthetic resin material to form a strong wooden board. It is cut into dimensions.

[0003] OSB is obtained by adding a water-resistant synthetic resin to a group of dried wood pieces and heating and pressurizing it to form a plate, and is supplied as a building material of rated dimensions.
Conventionally, in the construction industry, it has been recognized and used as a face material having water resistance, much stronger strength and dimensional stability than wood board, and having structural strength comparable to plywood.

FIG. 4 is a schematic view showing a case where OSB is fixedly used as a face plate on a wooden pillar. In actuality, at the time of construction, the one attached as shown in FIG.
As shown in FIG. 5, the OSB is deformed and swelled, and as shown in FIG. 5A, the OSB laminated with the foamed heat insulating material is used to deform and swell the OSB face material as shown in FIG. The phenomenon has come.

[0005] Therefore, in today's Japan, OSB is a plate material that is more dimensionally stable than a wooden board, but is not dimensionally stable, such as a particle board or a vulcanized fiber board, and is deformed when exposed to wind and rain for many years. It has been recognized that when using the OSB, the nails are attached to supporting members such as pillars, that is, the fixing points are increased.

[0006]

The OSB formed by heating and pressing a piece of wood strand with a synthetic resin material has a higher mechanical strength than a wooden board, but it is deformed over time when used as a wall material, and thus its appearance is impaired depending on the place of use. I was When OSB is used for the heat insulating wall, if the OSB is laminated on a foamed heat insulating material, the OSB surface expands due to aging, so the OSB is used together with a heat insulating material such as glass wool which is not affected by dimensional deformation. In other words, it took time to form the heat insulating wall. Accordingly, an object of the present invention is to improve these defects of the conventional OSB.

The inventor of the present application has analyzed and considered from various viewpoints the phenomenon of aging of OSB in Japan from various viewpoints.
Surprisingly, it has been found that each of the constituent strands of the OSB undergoes moisture absorption deformation. This discovery was unexpected because OSB was recognized as a material in which all the constituent strands were all covered with a water-resistant synthetic resin under heat and pressure, and was therefore regarded as a material having negligible hygroscopicity. .

The mechanism of the aging of the OSB is that the strands at the cutting edges absorb and expand from the cuts, and the other strands in contact with the moisture-absorbing strands are fixed and integrated with each other by synthetic resin adhered in the form of mist. However, the inventor found that moisture absorption was gradually propagated between the strands, and the inventors found that the OSB, which is much less hygroscopic than wood, had a moisture content similar to that of the operating environment. Came to the forcible grant.

[0009]

Means and Action for Solving the Problems Damage to a water-resistant synthetic resin adhesive, which is formed by solidifying OSB in a humidifier, with OSB building material delivered from the place of origin and having a prescribed moisture content of about 2%. A heat-resistant OSB which is heated and humidified so as not to cause a moisture content of 8 to 13% up to the center to generate dimensional distortion due to moisture absorption, and then cut again to a specified size under normal temperature and normal humidity.

Since the OSB is hardly affected by the change in the outside air humidity, the OSB is not deformed by the influence of the cold and warm outside air or moisture if the water content is forcibly absorbed to 8 to 13% up to the center. Therefore, it is a weather-resistant surface building material that is provided with dimensional stability in addition to its original excellent mechanical strength, that is, it does not deform even when exposed to the weather for many years, and can be used as a surface building material in all fields. The field has expanded.

Since the weather-resistant OSB of the present invention has dimensional stability, a foamed synthetic resin heat insulating plate is laminated on the OSB.
OSB does not swell even when used as a laminated building material for many years. Therefore, the thermal insulation wall construction only needs to install the OSB laminated thermal insulation board produced at the factory on site, and the wall construction can be rationalized.

[0012] In the invention of the OSB treatment method, oriented and strand board building materials having a prescribed size of about 2% moisture content delivered from the place of origin are placed in a humidifying chamber surrounded by heat insulating walls, and air is supplied between the boards. The radiator and the steam generator are switchably arranged in the humidifying chamber, and the humidity inside the chamber is maintained at about 80% by the action of the radiator and the steam generator. Internal temperature 40 ℃ ～ 7
The board was humidified for several days while maintaining the temperature at around 0 ° C., and after the moisture content in the center of the board reached 8 to 13%, the humidification and heating in the refrigerator were stopped, and then the damper 8 of the exhaust port O ₁ and The damper 9 of the air supply port O ₂ is opened, and the inside air is replaced with the outside air under the operation of the convection blower 5 and the exhaust blower 7 to assimilate the board with the outside air. Is cut off to make the board the prescribed size again.

Accordingly, a large amount of boards can be uniformly forcibly humidified without affecting the OSB molding resin under the rational use of heat energy, and the treated OSB is
It became a highly dimensionally stable building material that did not undergo moisture deformation or dry deformation even after being used for many years.

In the processing method, the radiator and the steam generator in the humidifying chamber are appropriately switched by a temperature / humidity sensor, and a high temperature and high humidity flow is circulated in the chamber. Was able to be processed rationally and uniformly in large quantities. When cooling the humidifier, the air supply port O
₂ and is opened only outlet O ₁ for the blown cooling while convection, coagulation adhesion of water droplets to the OSB surface by cooling could prevent.

Further, in the invention of the OSB processing device,
A steam generator and a heat radiator from a steam boiler are installed on a steam generator and a radiator in a humidification chamber composed of heat insulating walls.Each circuit is provided with an electric valve, and a temperature and humidity sensor is installed in the chamber. The humidifier has an exhaust port with an open / close damper and a blower on one wall, and an air supply port with an open / close damper on the other wall. .

Accordingly, steam for humidification and heat for heat dissipation can be rationally supplied from one steam boiler, and humidification and heat dissipation are switched by electric valve control by a temperature and humidity sensor, so that the high temperature and high humidity state in the refrigerator is as designed. Can be controlled. In addition, since the air in the humidification chamber is replaced with the outside air by a blower quickly from the air supply port on one wall to the exhaust port on the other wall, moisture attached to the OSB surface by humidification can be removed. Good workability.

[0017]

【Example】

(Processing device) The humidifying chamber 1 is in a form air-tightly surrounded by a heat insulating wall W as schematically shown in FIG. 3; an exhaust port O having an exhaust blower 7 and an opening / closing damper 8 on _one side wall W1. ₁ is provided, the other wall W ₂ of the opposite provided with air supply port O ₂ having a closing damper 9.

A steam boiler 2 is disposed outside the humidifying chamber, and a steam generator 4 communicating with the boiler via a motor-operated valve V ₁ in a circuit L ₁ is provided near _one side wall W ₁ in the chamber. ,
And electrically operated valves V ₂ , V ₂ so that steam from the boiler circulates.
₃ disposed radiator 3 that communicates with circuit L _2, L ₃ via the heat dissipation duct convection blower 5 to the rising heat radiation flow H from radiator 3 and the circulating air flow A in a humidified chamber D was placed at the exit.

A temperature / humidity sensor 6 is arranged at one corner in the storage, and the temperature / humidity sensor 6 and each of the electric valves V ₁ , V ₂ , V ₃
Are electrically connected, and the operation of the steam generator 4 and the radiator 3 can be electrically switched and controlled by the temperature and humidity sensor 6.

(Processing operation) The product was produced at the place of origin with a moisture content of 2%, and the thickness was 9.5 mm (3/8 ") according to the American Plywood Association (APA) standard, and the size was 122 cm (4 ') x 2
OSBs of 44 cm (8 ') are piled up in a humidifying cabinet while forming a gap between the boards in a humidifying cabinet, and the humidifying cabinet is closed. Next, as shown in FIG. 2, the humidity in the refrigerator is always 8 under the upper limit of the temperature sensor 40 ° C. and the humidity sensor 80%.
Humidity priority program such as 0%, temperature is 4
The electric valves V ₁ , V ₂ , V ₃ are controlled so as to be 0 ° C.
However, the blower 5 is always operated.

The initial storage area in FIG. 2 is the time required for the internal temperature to reach 40 ° C. while alternately repeating the humidification and heat radiation in the internal chamber about every 2 hours, and took about 12 hours. Then humidification period, the humidity is controlled to maintain 80% humidity also open the electric valve V ₁ is less than the temperature 40 ° C. is less than 80%, even only humidification heat radiation between the temperature 40 ° C. with a humidity of 80% OS at the measurement place in the refrigerator (where the convection is poor in the refrigerator) in a state of rest
It ended when the water content at the center of B reached 8%,
The humidification period was 72 hours.

In the cooling step, while the door of the humidifier is kept closed, the opening / closing damper 9 of the air supply port O ₂ is opened, and the opening / closing damper 8 of the exhaust port O ₁ is opened to operate the convection blower 5. Below, the air blower 7 was operated to perform the operation until the inside air was replaced with the outside air, but it took about 12 hours.

After the cooling step, the OSB in the humidification chamber was carried out, and the size of the OSB was increased by 0.25 to 0.3% in both the vertical and horizontal directions. However, in the cooling step, the blast cooling was performed with convection only at the air supply port O ₂ and the air discharge port O ₁ , so that almost no water droplets adhered to the OSB surface.

Each outgoing OSB was finished to the specified size at the time of manufacture by cutting off the edge again. Finished OS
When a weathering test was conducted to expose the B surface to wind and rain as a building material, it was tested at a temperature that would not damage the OSB molding resin during processing, so it had the structural strength as originally designed for OSB, and was far more than a natural wood board The result was that the weather resistance was extremely high without deformation.

(Others) If a fungicide is mixed into the steam discharged from the steam generator, the generation of mold can be prevented even during the long-term storage of the treated OSB. Since the OSB of the present invention has excellent weather resistance, it can be used as various wall materials in the form of a laminate with a foam-based heat insulating material. In terms of, construction time was also streamlined.

The reason why the room temperature during the treatment in the humidifying chamber was set at about 40 ° C. to 70 ° C. is to prevent the synthetic resin adhesive used at the time of molding the OSB from being damaged.
It is obvious that the room temperature can be appropriately set depending on the synthetic resin used. The moisture content of the weather-resistant OSB is 1
2 to 13% is most suitable in the climate of Japan, but if it contains 8% water, it can be used for ordinary applications in combination with the structure solidified with a water-resistant synthetic resin material.

[0027]

As described above, the weather-resistant OSB of the present invention is forcibly absorbed to a moisture content of 8 to 13% up to the center, so that it is combined with the structure in which the OSB is formed of a water-resistant synthetic resin, and the temperature of the outside air is low. And dimensional deformation due to the influence of wind and rain. Therefore, it is a weather-resistant surface building material provided with dimensional stability in addition to its original excellent mechanical strength, and the application range of OSB can be expanded.

Further, since the weather-resistant OSB has dimensional stability, it can be factory-produced as a laminated heat-insulating building material with a foamed synthetic resin heat-insulating plate, and rationalization of heat-insulating wall construction in the construction field can be achieved.

In the treatment method, the radiator and the steam generator are appropriately switched, and a high-temperature and high-humidity air flow is circulated in the refrigerator.
Large-scale processing can be performed rationally and uniformly. Further, since the cooling of the humidifying chamber is performed by blast cooling while opening only the air supply port O ₂ and the exhaust port O ₁ and causing convection, the solidification of water droplets on the OSB surface due to the cooling can be prevented.

Further, even in the processing apparatus, humidification and heat radiation can be effectively performed by one steam boiler, and humidification and heat radiation are switched by electric valve control using a temperature / humidity sensor. Can be controlled in the same way.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view of an apparatus used for OSB processing of the present invention.

FIG. 2 is a diagram illustrating the operation of the humidifying chamber of the present invention.

FIG. 3 is a perspective view for explaining the structure of an OSB including the present invention.

4A and 4B are explanatory diagrams of an operation when nailing conventional OSB to wood, where FIG. 4A shows a state immediately after construction and FIG. 4B shows an aged state.

5A and 5B are explanatory diagrams of an operation when a conventional OSB is laminated with a foam-based heat insulating material, wherein FIG.
(B) shows a state deformed over time.

[Explanation of symbols]

1 ... humidification chamber 2 ... steam boiler 3 ... radiator 4 ... steam generator 5 ... convection blower 6 ... temperature and humidity sensor 7 ... exhaust blower 8,9 ... closing damper O ₁ ... outlet O ₂ ... air supply opening

Claims (5)

[Claims] 1. An oriented and strand board (OSB) building material having a prescribed size at a water content of about 2% delivered from a place of origin, and a water-resistant synthetic resin adhesive used for solidifying the OSB in a humidifier. After heating and humidifying so as not to damage, and making the moisture content up to the center to 8 to 13% to generate dimensional distortion due to moisture absorption, it is cut again to a specified size under normal temperature and normal humidity, and is a weather-resistant oriented, strand board building material. . 2. An oriented / strand board laminated construction material in which a heat insulating plate is laminated on the oriented / strand board according to claim 1. 3. Oriented and strand board building materials with a prescribed moisture content of about 2% delivered from the place of origin can be air-flowed between the boards in a humidifier (1) surrounded by heat insulating walls. The radiator (3) and the steam generator (4) are switchably arranged in the humidifying chamber in such a manner that the radiator (3) and the steam generator (4) are operated in such a manner that the humidity in the chamber is increased. Is maintained at around 80% while the temperature in the refrigerator is 40 ° C to 7 ° C.
The board is humidified for several days while maintaining the temperature at about 0 ° C., and after the water content in the center of the board reaches 8 to 13%, the humidification and heating in the refrigerator are stopped, and then the damper of the exhaust port (O ₁ ) (8) and the damper (9) of the air supply port (O ₂ ) are opened to replace the inside air with the outside air under the operation of the convection blower (5) and the exhaust blower (7). Characterized in that the board is assimilated into the outside air, and then the moisture absorption expansion of the board is cut off to make the board a prescribed size again. 4. A radiator (3) and a steam generator (4) in a refrigerator.
4. The method according to claim 3, wherein the temperature and humidity sensors are appropriately switched, and a high-temperature and high-humidity air flow is circulated in the refrigerator. 5. A convection blower comprising a heat insulating wall.
Steam generator (4) and radiator in humidifier (1) provided with
To (3), the number of times steam is generated from one steam boiler (2)
Road (L₁) And heat dissipation circuit (L_Two, L_Three) And arrange each time
Road (L₁, L _Two, L_Three) To each motorized valve (V₁,
V_Two, V_Three) And a temperature / humidity sensor
(6) to provide each motorized valve (V₁, V_Two, V_ThreeElectrical)
Switching control is possible, and an open / close
Outlet (O) with par (8) and blower (7)₁)
On the other wall, an air inlet with an open / close damper (9)
(O_TwoOriented with strand board construction
Material processing equipment.