JPH11333986A - Fibrous board and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To upgrade the strength and the dimensional stability by using a lignocellulose filament whose fiber length is set within a specified range as a fiber in a fibrous board. SOLUTION: The fibrous board is manufactured by thermally molding a flock of fiber 1 under pressure after adding an adhesive 2 to plural pieces of fiber 1 and dispersing the fibers 1 and preparing them into the flock. In this case, a lignocellulose filament 1a whose fiber length is 6 mm or more is used as the fiber 1. Thus the plural pieces of fiber 1 form an entanglement part 20 in the fibrous board. The fibrous board is reinforced by the entanglement part 20 when a plurality of these entanglement parts 20 are formed and further the strength of the fibrous board is increased. In addition, using the lignocellulose filament 1a of such a long size increases an area where the adhesive is applied per piece of the fiber 1a. Consequently, the pieces of the lignocellulose filament 1a are interlocked firmly to contribute to the increasing of the strength of the fibrous board.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a fiberboard and a method for producing the same. Specifically, floor materials, wall materials,
The present invention relates to a material used for architectural members such as roofing materials, a material used for furniture and the like, a fiberboard usable as a surface material and a shaft material, and a method for producing the same.

[0002]

2. Description of the Related Art Plywood obtained by laminating veneer logs obtained by peeling log logs with a rotary lace has a high mechanical strength and dimensional stability.
It is widely used as a material for building materials such as roofing materials and furniture. The yield of raw materials when manufacturing plywood from raw wood logs increases as the diameter of the raw wood increases, but in addition to the fact that it takes a long time for trees to grow to such large diameter wood, The depletion of timber resources for plywood (log wood) has become a problem, especially for rawan used as logs, since the amount regenerated by tree planting has not kept up with the amount of logging. In addition, as the regulation of deforestation, especially in tropical rainforests, tends to be tightened in connection with environmental issues such as global warming and desertification, it is not possible to secure a stable supply of plywood in the future. It is a very difficult problem.

[0003] In recent years, particle boards, strand boards, and medium fiber boards (MDF) made of wood chips and wood fibers have been replaced with plywood made mainly from raw wood logs.
Wood-based boards are attracting attention. These wood-based boards are formed by mixing an adhesive with small pieces of wood or wood fiber and heating and press molding, and do not necessarily require large-diameter logs like plywood. Can be used, and in some cases, miscellaneous wood, woodwork scrap, waste wood, defective wood, and the like can also be used, so that there is an advantage that the raw materials can be used effectively. Among them, MDF is a fiberboard formed from fine fibers obtained from wood, so it is excellent in workability and surface smoothness, and it is cheaper than plywood in terms of cost. Used. The MDF has a cross-sectional structure as shown in FIG. 17, and is formed in a structure in which fibers 1 obtained from wood are bonded by an adhesive 2.

The wood fiber used for the fiberboard is obtained by processing small pieces obtained from softwood or hardwood using a fibrillating machine such as a refiner or a defibrator, but is usually processed to a length of less than 6 mm. When high surface smoothness and workability are required for the fiberboard, the fiberboard is formed using short fibers having a length of 2 mm or less. Generally, the strength of the fiberboard is the strength of the fibers themselves, the entanglement of the fibers,
Although it is determined by the strength of the bonding portion between the fibers, the MDF formed by using the short fibers as described above has a small number of entanglements between the fibers, and thus the MDF formed by the entanglement between the fibers.
The contribution of F to the strength is small, and the strength of the bonded portion between the fibers contributes much more to the strength of the fiberboard than the strength of the fibers themselves.

However, in a fiberboard using fine short fibers,
Since the number of bonded portions between fibers becomes very large, it is difficult to bond many fibers firmly with each other by a normal bonding method, and there is a problem that the strength of the fiberboard is reduced. Therefore, in order to increase the strength of the bonding part between fibers, a method of increasing the amount of adhesive to strengthen the bonding between fibers can be considered, but this requires a large amount of adhesive and is cost-effective. Not a target. Therefore, there is a limit in increasing the strength of the bonded portion between the fibers, and the strength of the fiber itself is not sufficiently exhibited, so that the mechanical strength of the fiberboard is lower than that of the plywood.

[0006] Wood fiber, which is a raw material of fiberboard, changes its dimensions when absorbing water and moisture. Therefore, the fiberboard undergoes a large dimensional change in a plane parallel to the surface during water absorption and moisture absorption. Furthermore, since the fiberboard is compressed in the thickness direction at the time of molding, recovery from compression occurs due to moisture, and the expansion of the thickness during water absorption and moisture absorption increases. As a result, the dimensional stability was also inferior to plywood. On the other hand, instead of using the above-mentioned wood resources, attempts have been made to use unused plant resources such as coconut fiber as building materials, as disclosed in Japanese Patent Application Laid-Open No. 9-94811. Describes a coconut shell mat. Building materials using unused plant resources, such as this palm shell mat, are made of mats by randomly arranging and entangled fibers obtained from unused plant resources. It is used as a material, cushioning material, and heat insulating material. Building materials using such unused plant resources are light in weight due to their low density and a large number of voids inside, and are breathable, breathable, cushioned, sound-absorbing, and heat-insulating. It has the characteristic that it is excellent.

[0007] However, in addition to having a large number of voids inside, the strength is mainly expressed only by the entanglement of the fibers, so that compared to MDF using plywood or wood fiber,
The strength is poor, and there is a problem that it cannot be used for architectural members such as floor materials, wall materials, and roof materials. Considering global environmental issues and the effective use of wood resources, compared to plywood, there is no inferiority in the basic performance of boards such as strength and dimensional stability, and fiber that is inexpensive. The need for boards is growing.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a fiberboard having high strength and high dimensional stability and a method for producing the same.

[0009]

According to a first aspect of the present invention, there is provided a fiberboard obtained by bonding a large number of fibers 1 with an adhesive 2, wherein the fiber 1 has a fiber length of 6 mm or more. It is characterized by using cellulose long fibers 1a.

A fiberboard according to a second aspect of the present invention is characterized in that, in addition to the constitution of the first aspect, the lignocellulose short fiber 1b having a fiber length of less than 6 mm is used as the fiber 1. is there.

A fiberboard according to a third aspect of the present invention is characterized in that, in addition to the constitution of the first or second aspect, a lignocellulose long fiber 1a obtained from oil palm, coconut palm, or kenaf is used. Things.

A fiberboard according to a fourth aspect of the present invention is characterized in that, in addition to any one of the first to third aspects, the lignocellulose long fibers 1a are oriented in substantially one direction. It is.

A fiberboard according to a fifth aspect of the present invention is characterized in that, in addition to any one of the first to third aspects, the lignocellulose long fibers 1a are oriented in two directions substantially orthogonal to each other. Is what you do.

A fiberboard according to a sixth aspect of the present invention is characterized in that, in addition to any one of the first to fifth aspects, the lignocellulose long fiber 1a is woven or woven. .

According to a seventh aspect of the present invention, in addition to any one of the first to sixth aspects, the fiberboard comprises a plurality of layers 3 and at least one layer 3a is made of lignocellulosic long fibers 1a. It is characterized by being formed.

According to a fifteenth aspect of the present invention, in addition to the seventh aspect, at least one layer 3a is formed of lignocellulose long fibers 1a oriented in substantially one direction. It is characterized by the following.

According to a ninth aspect of the present invention, in addition to the structure of the seventh or eighth aspect, at least one layer 3a is provided.
Are formed of lignocellulose long fibers 1a oriented in two directions substantially orthogonal to each other.

The fiberboard according to claim 10 of the present invention is characterized in that
In addition to the constitution of any one of claims 7 to 9, at least one layer 3a is formed of woven or woven lignocellulosic filaments 1a.

[0019] The fiberboard according to claim 11 of the present invention is characterized in that:
The surface layer 4 in addition to the configuration according to claim 7.
Is a lignocellulose long fiber 1a oriented in substantially one direction.
It is characterized by being formed by.

The fiberboard according to claim 12 of the present invention is characterized in that:
The surface layer 4 in addition to the configuration according to claim 7.
Are formed of lignocellulose long fibers 1a oriented in two directions substantially orthogonal to each other.

Further, the fiberboard according to claim 13 of the present invention comprises:
The surface layer 4 in addition to the configuration according to claim 7.
Is formed from woven or woven lignocellulose long fibers 1a.

Further, the fiberboard according to claim 14 of the present invention is
The surface layer 4 according to any one of claims 7 to 13,
And a boundary surface 7 of the layer 5 adjacent thereto is formed in a curved surface.

Further, the fibrous board according to claim 15 of the present invention comprises:
In addition to the configuration of any one of claims 7 to 14, a plurality of layers 6 formed of lignocellulosic long fibers 1a oriented in substantially one direction are provided, and at least one layer 6a of the lignocellulose long fibers 1a is provided. It is characterized in that the orientation direction is made different from the orientation direction of the lignocellulose long fibers 1a of the other layer 6b.

Further, the fiberboard according to claim 16 of the present invention comprises:
In addition to the configuration of any one of claims 7 to 15, a layer formed of lignocellulose long fibers 1a having a fiber length of 6 mm or more, and a lignocellulosic short fiber 1 having a fiber length of less than 6 mm.
and a layer formed by laminating the layers.

Further, the fiberboard according to claim 17 of the present invention comprises:
In addition to the constitution of any one of claims 7 to 16, it has a layer formed of inorganic fibers.

[0026] The fiberboard according to claim 18 of the present invention is characterized in that:
In addition to the configuration of any one of the first to seventeenth aspects, the internal density is formed lower than the density near the surface.

[0027] The fiberboard according to claim 19 of the present invention comprises:
In addition to the structure of any one of the first to eighteenth aspects, the present invention is characterized in that it has a fiber bundle 8 in which lignocellulose long fibers 1a are bundled with being oriented in substantially one direction.

According to a twentieth aspect of the present invention, there is provided a method of manufacturing a fiberboard, comprising: laminating a plurality of aggregates of fibers 1 in which an adhesive 2 is dispersed, and applying heat or pressure to the aggregates. It is a feature.

According to a fifteenth aspect of the present invention, there is provided a fiberboard manufacturing method, wherein heat and pressure are applied to an aggregate of fibers 1 in which an adhesive 2 is dispersed to form a layer, and a plurality of layers are bonded. And stacking them.

[0030]

Embodiments of the present invention will be described below.

The fiberboard of the present invention is prepared by adding an adhesive 2 to a large number of fibers 1 and dispersing them to prepare an aggregate of the fibers 1, and applying heat or pressure to the aggregate to perform hot-press molding. Thereby, it is formed in a plate shape as shown in FIG.
The lignocellulose long fiber 1a having a fiber length of 6 mm or more is used as the fiber 1. By using the lignocellulose long fiber 1a having a fiber length of 6 mm or more as the fiber 1 as described above, a plurality of entangled portions 20 of the fibers 1 are formed inside the fiberboard as shown in FIG. .

Generally, the strength of the fiberboard is determined by the strength of the fiber itself,
Although it is determined by the entanglement of the fibers and the strength of the bonded portion between the fibers, in the present invention, as shown in FIG. 2, the entangled portion 20 of the lignocellulose fiber 1a is present in a large number inside the fiberboard, so that the entangled portion 20 Can reinforce the fiberboard and increase the strength of the fiberboard. In addition, by using the long lignocellulose fibers 1a, it is possible to increase the adhesion portion of the adhesive per one. Therefore, there will be a large number of bonded portions between the lignocellulose fibers 1a, whereby the bonding between the lignocellulose fibers 1a can be strengthened,
The strength of the fiberboard can be increased. Furthermore, since the main components of lignocellulose fibers are cellulose and lignin, the fibers themselves have higher strength than other natural fibers. In other words, the fiber board of the present invention can increase the entanglement between the fibers and increase the strength of the bonding portion between the fibers by using the long lignocellulose fibers 1a having a fiber length of 6 mm or more, and furthermore, the fibers between the fibers By increasing the entanglement and increasing the strength of the bonding portion between the fibers, the high strength of the fibers themselves can be reflected in the strength of the fiberboard and utilized, and the strength can be increased.

The fiber length of the lignocellulose long fiber 1a is
There is no particular limitation as long as it is 6 mm or more. If the fiber length of the lignocellulosic long fiber 1a is less than 6 mm, a high strength fiberboard cannot be formed. Most lignocellulose short fibers having a fiber length of less than 6 mm have a straight shape. Therefore, the entangled portions of the fibers are reduced inside the fiberboard made of only lignocellulose short fibers, and the reinforcing effect by the entangled portions of the fibers cannot be obtained. Also, when lignocellulose short fibers are used, the portion of the lignocellulose short fibers to which the adhesive is adhered per fiber is reduced, and the portion where fibers are bonded to each other is reduced. As a result, there is a limit in increasing the strength of the bonding portion between the fibers, and the strength of the fibers themselves cannot be sufficiently reflected in the strength of the fiberboard. Therefore,
A fiberboard using only lignocellulose short fibers having a fiber length of less than 6 mm cannot increase the strength.

The length of the lignocellulose filament 1a is preferably not more than 200 mm. When the fiber length of the lignocellulose long fiber 1a exceeds 200 mm, it is difficult to form the aggregate of the fibers 1 into a predetermined shape, and it is difficult to uniformly disperse the adhesive 2 in the aggregate. In the process of forming the lignocellulose long fiber 1a during the process of forming the lignocellulose long fiber 1a, there is a possibility that a problem such as a decrease in handleability may occur. Therefore, the fiber length of the lignocellulose long fiber 1a is suitably set to 6 to 200 mm.

The type of the lignocellulosic long fiber 1a is not particularly limited as long as its main component is composed of cellulose and lignin, and examples thereof include fibers obtained from palm, hemp, sugar cane, bamboo, rice and the like. . At present, these fibers are hardly used as a material for fiberboards and are wastes. Therefore, by using fibers obtained from the above-mentioned palm, hemp, sugar cane, bamboo, rice, and the like, it is possible to reduce waste and at the same time, to save valuable wood resources.

As the lignocellulose long fiber 1a, oil palm fiber obtained from oil palm, coco fiber obtained from coconut, and kenaf fiber obtained from kenaf can be used. These fibers are compared to softwood fibers obtained from softwood and hardwood fibers obtained from hardwood.
It has a high strength of about 2 to 14 times, and by using these fibers, the strength can be improved as compared with a fiber board made of only softwood fibers or hardwood fibers.

Oil palm is mainly cultivated in Malaysia, Indonesia, the Philippines, and the like. In recent years, the cultivated area has increased due to an increase in demand for palm oil. Empty fruit bunches (Empty Fruit Bun)
ch) and the petiole of oil palm (Fron
d) and the like are not used even though most of their compositions are composed of fibrous materials. Therefore, with the increase in the cultivation area of oil palm, the amount of waste of empty fruit clusters and petiole has also increased. Therefore, it is conceivable to use fibers obtained from these empty fruit clusters and petiole parts. In the empty fruit cluster and petiole, fibers are easily obtained by a physical shearing treatment (fibrillation treatment) with a hammer mill or the like, and the empty fruit clusters are collected for each fruit body for the purpose of harvesting fruits. Fruit bunches can also be obtained easily, so that the fibers of empty bunches can be obtained relatively easily. Accordingly, oil palm fiber is suitable as a material for a fiberboard from the viewpoint of cost.

Kenaf is an annual plant of hemp and is cultivated mainly in China and Southeast Asia. Kenaf fiber has been conventionally used in nets and ropes, and in recent years, has also been used as a raw pulp for non-wood paper. However, it is hardly used as a material for fiberboard. Then, by immersing the kenaf in water, the fiber can be easily obtained from the bast portion of the kenaf.

The above oil palm fiber, coco fiber and kenaf fiber usually have a fiber length of 6 mm or more,
It is longer than softwood or hardwood fibers used as a material for F. In the present invention, these long oil palm fibers, coconut fibers and kenaf fibers are cut into 6 mm by a simple means such as a knife.
It is used by appropriately cutting it into the above length. The diameter of oil palm fiber, coconut fiber, and kenaf fiber is approximately 50 to 1
000 μm. From the above, when fibers obtained from oil palm, coconut palm, and kenaf are used as the lignocellulose long fibers 1a, the long fibers can be easily obtained, the supply is stable, and the fiber has the advantages of being easily available. The strength of the plate can be increased.

Further, as the fiber 1, a lignocellulose short fiber 1b having a fiber length of less than 6 mm can be used by compounding or mixing with the above-mentioned lignocellulose long fiber 1a. As the lignocellulose short fiber 1b, a fiber obtained from softwood or hardwood can be used.
Although not particularly limited as long as it is less than mm, lignocellulose short fibers 1b obtained from conifers such as agathis and pine, and lignocellulose short fibers 1b obtained from broadleaf trees such as lauan, melanchi, oak, beech, and rubber trees are ,
Conventionally, since it is often used as a material for MDF, there is an advantage that the supply is stable and easy to obtain. Therefore, it is preferable to use those obtained from such coniferous or hardwood. In addition, lignocellulose filament 1a
The weight ratio of the lignocellulose short fiber 1b to the lignocellulose short fiber 1b is not particularly limited, but the lignocellulose long fiber 1a is 1 part by weight to the lignocellulose short fiber 1b.
It is preferred that b be 2 parts by weight or less.

The fiber 1 is compounded or mixed with the lignocellulosic long fiber 1a to have a fiber length of 6 mm.
By using less than the lignocellulose short fibers 1b together, the entangled portion 20 of the lignocellulose long fibers 1a
The lignocellulose short fiber 1b can be present in the vicinity to reinforce the fiberboard, thereby improving the strength of the fiberboard. By increasing the ratio of the lignocellulose short fibers 1b near the surface of the fiberboard, the surface smoothness of the fiberboard can be improved. The lower limit of the fiber length of the lignocellulose short fiber 1b is not particularly limited, but can be set to 3 to 4 times the diameter.

The adhesive 2 used in the present invention is not particularly limited, but is generally urea resin, melamine resin, phenol resin, resorcinol resin, epoxy resin, urethane resin, furferal resin, isocyanate resin. A thermosetting resin that is cured by heating like a resin can be used.

The fiber board of the present invention can be formed as follows. First, the adhesive 2 is added to the fiber 1 composed of the lignocellulose long fiber 1a alone or the lignocellulose long fiber 1a and the lignocellulose short fiber 1b and uniformly dispersed. The amount of the adhesive 2 added to the fiber 1 is 2 to 30% by weight, preferably 8 to 30% by weight.
It can be set to １５15% by weight. If the amount of the adhesive 2 is less than 2% by weight, the fiber 1 cannot be firmly bonded, and the strength of the fiberboard may be reduced. If it exceeds, the adhesive 2 may be consumed wastefully or a large amount of heat may be required to cure the adhesive 2, which may be disadvantageous in cost.

Next, the fibers 1 in which the adhesive 2 is dispersed are put into a mold and collected to form an aggregate. Next, the assembly is taken out of the mold and placed between the hot plates. Next, heat and pressure are applied to the aggregate by a hot plate to perform hot-press molding, the aggregate is formed into a plate shape, and the adhesive 2 in the aggregate is cured to bond the fibers 1 to each other. A plate can be formed. The temperature, time and pressure at the time of hot pressing are appropriately set depending on the type of the adhesive 2 and the thickness and density of the fiberboard. For example, the temperature is 20 to 180 ° C, preferably 100 to 150 ° C. Can be set. As a pressing method at the time of hot pressing, a batch-type flat plate press, a continuous press, or the like can be employed, but is not particularly limited.

The density of the fiberboard is not particularly limited, but is high.
If mechanical strength is required, 0.3-1.0 g / cm^Three
Is preferably set to, more preferably 0.5 to
0.9g / cm^ThreeSet to. 0.3g fiberboard density
/ Cm^ThreeIf it is less than this, there are many voids inside the fiberboard.
Are present, and the bonding portion between the fibers 1 and the fibers 1
The entangled portion 20 of the fiber is reduced,
Fiber by the adhesive part of the fiber and the entangled part 20 of the fibers
The reinforcement effect of the fiberboard cannot be exhibited,
The mechanical strength of the plate may decrease. Also the density of fiberboard
The degree is 1.0 g / cm ^ThreeExceeds the pressure during hot pressing.
Is too high and breaks the fiber itself,
The effect of improving the mechanical strength is reduced.

FIG. 3 shows another embodiment. In this fiberboard, the lignocellulose long fibers 1a are regularly arranged and the fiber direction is oriented in substantially one direction (in FIG. 3, it is a direction parallel to one side of the fiberboard, and the direction is indicated by an arrow a). It is formed by Lignocellulose filament 1a
Has a feature that its strength in the fiber direction is particularly high. Therefore, in the fiberboard in which the lignocellulose long fibers 1a are oriented in substantially one direction, the lignocellulose long fibers 1a
The excellent strength characteristics in the fiber direction can be utilized, and the lignocellulose long fiber 1a has extremely high strength against compression and tension in the orientation direction.

As described above, the lignocellulose long fiber 1a
In the fiberboard in which is oriented, the more the all lignocellulose long fibers 1a are oriented in one direction, the higher the strength of the fiberboard is, which is preferable. However, the fiber length is 6
It is extremely difficult to orient and align all lignocellulose long fibers 1a of at least mm in one direction. Therefore, the fiber direction (orientation direction) of all the lignocellulose long fibers 1a with respect to the direction of the side of the fiber plate that is long in the same direction as the direction in which the lignocellulose long fibers 1a are oriented.
It is preferable to orient the lignocellulose long fibers 1a in substantially one direction such that the inclination of the lignocellulose long fibers 1a is in the range of +30 to -30 °, and more preferably +20 to -20 °.

By orienting the lignocellulose long fiber 1a having a fiber length of 6 mm or more in substantially one direction in this manner, the lignocellulose short fiber 1b having a fiber length of less than 6 mm is obtained.
It is more effective to increase the strength of the fiberboard than to orient the fibers in one direction. As shown in FIG. 5 (a), even when the lignocellulose short fibers 1b are oriented in substantially one direction and the fibers are bonded to each other, the number of the bonding portions 21 per one lignocellulose short fiber 1b is small. And FIG.
As shown in (1), when the lignocellulosic long fibers 1a are oriented in substantially one direction and the fibers are adhered to each other, the bonded portion 21 per one lignocellulose long fibers 1a increases. That is, the bonding force (adhesion force) between the fibers by the adhesive 2
Is stronger when the lignocellulose long fibers 1a are oriented. Therefore, by orienting the lignocellulose long fibers 1a, the strength of the fiber material can be reflected on the fiberboard and utilized more, and it can be expected that the contribution of the strength of the fiber material to the strength of the entire fiberboard is increased. . That is, it is presumed that the strength of the lignocellulose long fiber 1a itself can be effectively used to increase the strength of the entire fiberboard.

Further, the lignocellulosic fiber has a very small rate of change in length in the fiber direction during water absorption and moisture absorption. For this reason, the lignocellulose long fiber 1a is oriented in substantially one direction to form a fiberboard. By,
The dimensional stability at the time of water absorption and moisture absorption in the orientation direction (fiber direction) can be enhanced. That is, by orienting the lignocellulose long fibers 1a having a fiber length of 6 mm or more in substantially one direction, it is possible to form a fiberboard having extremely excellent strength and dimensional stability in the orientation direction.

The method for orienting the lignocellulose long fiber 1a in substantially one direction is not particularly limited, but an orientation device as shown in FIG. 6 can be used. This orienting device is formed by including a plurality of sets of drawing portions 22 composed of upper and lower roller pairs and a comb-shaped combing portion 23. After passing a number of entangled lignocellulose filaments 1a between the rollers of the drawing portion 22, the comb pieces 23a of the combing portion 23 are formed.
Between the rollers of the other drawing part 22, and the film is oriented in substantially one direction. Thereafter, the lignocellulose filaments 1 oriented in substantially one direction
By appropriately laminating a and hot-press molding, a fiber board in which the lignocellulose long fibers 1a are oriented in substantially one direction can be formed.

The fiberboard in which the lignocellulosic long fibers 1a are oriented in substantially one direction is preferably used for shaft materials requiring particularly high strength and dimensional stability in uniaxial directions, such as columns and beams. Can be. In addition, lignocellulose long fiber 1
In the direction in which a is oriented, it can be used as a reinforcing material that reinforces the mechanical strength of the surface material and suppresses dimensional change during water absorption and moisture absorption.

FIG. 7 shows another embodiment. This fiberboard is formed by orienting lignocellulose long fibers 1a in two directions substantially orthogonal to each other. Thus, the fiberboard in which the lignocellulose long fibers 1a are oriented in two directions substantially orthogonal to each other has extremely high strength in the two directions in which the fibers are oriented, and has less anisotropy in strength. In addition, the dimensional stability in two directions substantially perpendicular to each other is improved. Therefore, the fiberboard in which the lignocellulose long fibers 1a are oriented in two directions substantially orthogonal to each other is suitable for applications such as floor materials, wall materials, and surface materials such as roof materials. In addition, by bonding with surface materials such as flooring,
It can be used as a reinforcing material that increases the strength of the surface material and suppresses dimensional changes. In the present invention, “substantially orthogonal” means that the average orientation direction of each of the lignocellulose long fibers 1a intersects at an angle of 90 ± 15 °.

FIG. 8 shows another embodiment. This fiberboard is formed by weaving (knitting) or weaving (weaving) the lignocellulose long fibers 1a. In the fiberboard formed by weaving or weaving the lignocellulose long fibers 1a in this way, the entanglement between the fibers is reinforced and the strength of the bonded portion between the fibers is increased. Therefore, the strength of the fiber material can be further utilized. As described above, the lignocellulose filament 1a
Has excellent strength, and as a result, a fiberboard formed by weaving or weaving the lignocellulose long fibers 1a has little strength anisotropy and has high strength. Furthermore, the dimensional change of the fibers during water absorption and moisture absorption is suppressed by increasing the bonding force between the fibers.

Therefore, in the in-plane direction of the fiberboard in which the lignocellulose long fibers 1a are woven or woven, the dimensional change is small and the fiberboard is excellent in dimensional stability. In addition, the dimensional change in the in-plane direction in the present invention refers to a dimensional change in a plane parallel to the fiberboard surface in a fiberboard formed into a plate shape. Therefore, the fiberboard formed by weaving or weaving the lignocellulosic long fibers 1a is suitable for applications such as floor materials, wall materials, roof materials and other surface materials. Also, by bonding with surface materials such as flooring, the mechanical strength of the surface material is reinforced,
It can be used as a reinforcing material for suppressing the dimensional change of the surface material.

The method of weaving or weaving the lignocellulosic filaments 1a in this fiber board is not limited. For example, using an orientation device as shown in FIG.
After orienting the lignocellulose long fibers 1a in one direction and collecting and forming the lignocellulose long fibers 1a into a bundle,
The yarn can be spun into yarn, and the yarn can be knitted (woven) as warp and weft to form the sheet 30. The shape of the sheet 30 in which the lignocellulose long fibers 1a are woven (woven) may be as shown in FIG. Then, the woven sheet 30 is appropriately laminated, and then hot-pressed, whereby a fiber board in which the lignocellulose long fibers 1a are woven (woven) can be formed.

FIG. 10 shows another embodiment. This fiberboard is formed by laminating a large number of layers 3, and at least one layer 3 among the layers 3 constituting the multilayer fiberboard is formed.
a is formed by the lignocellulose long fiber 1a. And a layer 3a made of lignocellulose long fiber 1a
By laminating, the strength of the fiberboard having a multilayer structure is increased. That is, since this fiberboard has at least one layer 3a made of lignocellulose long fibers 1a of 6 mm or more, the strength is increased by the effect of entanglement of the lignocellulose long fibers 1a of 6 mm or more. It will be expensive. The layer 3 other than the layer 3a composed of the lignocellulose long fibers 1a is not particularly limited. For example, a layer composed of the lignocellulose short fibers 1b or a layer composed of the MDF is used according to the required performance of the fiberboard. Selection can be made as appropriate.

Further, among the layers 3 constituting the multilayered fiberboard, at least one layer 3a can be formed of lignocellulose long fibers 1a oriented in one direction. By forming at least one layer 3a of the lignocellulose long fibers 1a oriented in one direction, the strength of the fiberboard in the orientation direction of the lignocellulose long fibers 1a can be increased, and the lignocellulose length can be increased. The dimensional stability of the fiberboard in the orientation direction of the fibers 1a can be improved.

That is, since the fiberboard has the layer 3a in which the lignocellulose long fibers 1a of 6 mm or more are oriented, the layer 3a in which the lignocellulose long fibers 1a are oriented has excellent strength and dimensional stability. Therefore, the strength of the multilayer fiberboard having the layer 3a in which the lignocellulose long fibers 1a are oriented is increased by the layer 3a in which the lignocellulose long fibers 1a are oriented, and the dimensional stability of the multilayer fiberboard is improved. The dimensional change is suppressed by the excellent dimensional stability of the layer 3a in which the lignocellulose long fibers 1a are oriented. Therefore, this fiberboard has extremely excellent strength in the orientation direction of the lignocellulose long fiber 1a,
Since it has high dimensional stability, it is suitable for applications such as shaft materials, for example, such as column materials and beam materials, in which uniaxial strength is particularly required.

The fiberboard having a structure in which five layers 3 are stacked as shown in FIG. 10 has a structure in which a layer 3 a in which lignocellulose long fibers 1 a are oriented in one direction is stacked adjacent to the surface layer 4. It has. There is no particular limitation on the layers other than the layer 3a in which the lignocellulose long fibers 1a are oriented in one direction. For example, depending on the required performance of the fiberboard, such as a layer made of lignocellulose short fibers 1b or a layer made of MDF. Selection can be made as appropriate.

Further, among the layers 3 constituting the multilayered fiber board, at least one layer 3a can be formed of lignocellulose long fibers 1a oriented in two directions substantially orthogonal to each other. By forming at least one layer 3a from the lignocellulose long fibers 1a oriented in two directions substantially orthogonal to each other, it is possible to increase the strength of the fiberboard in the orientation direction of the lignocellulose long fibers 1a. The strength anisotropy can be reduced, and the dimensional stability of the fiberboard in the orientation direction of the lignocellulose long fiber 1a can be improved. By the layer 3a in which 1a is oriented, the strength is increased and the dimensional change is suppressed.

That is, the strength in the two substantially perpendicular directions in which the lignocellulose long fibers 1a are oriented is extremely high, and the dimensional stability in the substantially perpendicular two directions in which the lignocellulose long fibers 1a are oriented is also improved. A fiberboard with small anisotropy of strength and dimensional stability can be obtained. Therefore, this fiberboard is suitable for uses such as floor materials, wall materials, and surface materials such as roof materials. Note that there is no particular limitation on the layers other than the layer 3a in which the lignocellulose long fibers 1a are oriented in two directions substantially orthogonal to each other, and can be appropriately selected according to the required performance of the fiberboard.

Further, it can be formed of a layer 3a of lignocellulose long fibers 1a in which at least one layer 3a among layers 3 constituting a multilayer fiber board is woven. By forming at least one layer 3a with the layer 3a of lignocellulose long fibers 1a woven, the strength of the fiberboard can be increased, and further, the dimensional stability of the fiberboard in the in-plane direction can be improved. Can be improved,
In the fiberboard having this multilayer structure, the strength is increased and the dimensional change is suppressed by the layer 3a in which the lignocellulose long fibers 1a are woven. Therefore, this fiberboard is suitable for uses such as surface materials such as flooring materials, wall materials, and roofing materials. In addition, the layer 3 in which the lignocellulose long fiber 1a was knitted.
There is no particular limitation on the components other than a, and for example, a layer made of lignocellulose short fiber 1b or a layer made of MDF can be appropriately selected according to the required performance of the fiberboard.

FIG. 11 shows another embodiment. This fiberboard is formed by laminating a large number (three layers) of layers 3.
Of the layers 3 constituting the multilayer fiber board, the outermost surface layer 4 is formed of lignocellulose long fibers 1a oriented in one direction. The strength of the fiberboard is the surface layer 4
It tends to be more dependent on the strength of the surface layer 4 than the other inner layers 33. Therefore, by forming the surface layer 4 with the lignocellulose long fibers 1a oriented in one direction,
The strength of the surface layer 4 can be increased, and the reinforcement of the high-strength surface layer 4 can increase the strength of the fiberboard in the orientation direction of the lignocellulose long fibers 1 a of the surface layer 4. Lignocellulose filament 1a
Dimensional stability at the time of water absorption / moisture absorption of the fiberboard in the orientation direction of (1). Therefore, this fiber board is suitable for applications such as shaft materials, such as columns and beams, which are particularly required to have uniaxial strength. In addition, lignocellulose long fiber 1a
There is no particular limitation on the inner layer 33 other than the surface layer 4 in which is oriented in one direction. For example, depending on the required performance of the fiberboard, such as a layer made of lignocellulose short fiber 1b or a layer made of MDF. Can be selected as appropriate.

FIG. 12 shows another embodiment. This fiberboard is formed by laminating a large number (three layers) of layers 3, and the outermost surface layer 4 of the layers 3 constituting the multilayer fiberboard is substantially perpendicular to two directions. It is formed by oriented lignocellulose long fibers 1a. The strength of the fiberboard tends to be more dependent on the strength of the surface layer 4 than the inner layer 33 other than the surface layer 4. Therefore, the strength of the surface layer 4 can be increased by forming the surface layer 4 with the lignocellulose long fibers 1a oriented in two directions substantially orthogonal to each other. Can increase the strength of the fiberboard in the orientation direction of the lignocellulosic long fiber 1a, and can further reduce the anisotropy of the strength of the fiberboard. The dimensional stability of the fiberboard in two directions substantially orthogonal to each other can be improved. Therefore, this fiberboard is suitable for uses such as floor materials, wall materials, and surface materials such as roof materials. The inner layer 33 other than the surface layer 4 in which the lignocellulosic long fibers 1a are oriented in two directions substantially orthogonal to each other is not particularly limited. For example, a layer made of lignocellulose short fibers 1b and a layer made of MDF may be used. It can be appropriately selected according to the required performance of the fiberboard.

The surface layer 4 can be formed by knitting or weaving the lignocellulose long fibers 1a.
By weaving or weaving the lignocellulose long fibers 1a to form the surface layer 4, the two-dimensional connection of the lignocellulose long fibers 1a is extremely strong, and the strength of the surface layer 4 is increased. For this reason, the fiberboard having a multilayer structure can be reinforced by the surface layer 4 having high strength. As a result, it is possible to form a fiberboard having excellent strength and less anisotropy of strength at the same time.
The dimensional stability in the in-plane direction can be increased. Therefore, this fiberboard is suitable for uses such as floor materials, wall materials, and surface materials such as roof materials. In addition, lignocellulose long fiber 1a
The inner layer 33 other than the surface layer 4 formed by weaving or weaving is not particularly limited. For example, the required performance of the fiberboard, such as a layer made of lignocellulose short fibers 1b or a layer made of MDF, is used. Can be selected as appropriate.

FIG. 13 shows another embodiment. This fiberboard is formed by laminating a large number (three layers) of layers 3.
The lignocellulosic filaments 1a are laminated such that the boundary surface 7 between the surface layer 4 in which the lignocellulose long fibers 1a are oriented in one direction and the layer 5 (the inner layer 33) adjacent to the surface layer 4 is curved. The strength of the multilayer fiberboard tends to depend on the strength of the surface layer 4 and the adhesive strength between the surface layer 4 and the adjacent layer 5. As mentioned above,
Although the strength of the surface layer 4 is increased by the strength of the lignocellulose long fiber 1a, the adhesive strength between the surface layer 4 and the adjacent layer 5 is greatly affected by the shape of the boundary surface 7. By laminating the boundary surface 7 so as to be a curved surface as described above, the bonding area is increased and the bonding strength between the surface layer 4 and the layer 5 adjacent thereto can be increased. By increasing the adhesive strength of the layer 5 adjacent to the fiber, the strength of the fiberboard can be increased, and the dimensional stability of the lignocellulosic long fiber 1a at the time of water absorption and moisture absorption in the fiber direction can be increased.

FIG. 14 shows another embodiment. This fiberboard is formed in a multilayer (9-layer) structure in which a large number of layers 6 in which the lignocellulose long fibers 1a are oriented in one direction are laminated, and the lignocellulose long fibers 1a of the layer 6a are formed.
And the orientation direction of the lignocellulose long fiber 1a in the layer 6b adjacent to the layer 6a is formed so as to be substantially orthogonal. The fiberboard shown in FIG. 15 is formed in a multilayer (three-layer) structure in which many layers 6 in which the lignocellulose long fibers 1a are oriented in one direction are laminated, and the lignocellulose length of the layer 6a is changed. The orientation direction of the fiber 1a and the layer 6
This is formed so that the orientation direction of the lignocellulose long fiber 1a of the layer 6b adjacent to the layer a is substantially orthogonal to the layer 6b.

As described above, by forming the orientation direction of the lignocellulose long fiber 1a in the layer 6a and the orientation direction of the lignocellulose long fiber 1a in the layer 6b adjacent to the layer 6a so as to be substantially orthogonal, the lignocellulose long fiber The strength and dimensional stability anisotropy of the fiberboard in two directions substantially orthogonal to each other in the orientation direction of 1a can be extremely reduced, and the overall strength and dimensional stability of the fiberboard can be uniformly increased. is there.

The number of layers and the thickness of the layers 6 are appropriately set and are not particularly limited. One of the layers 6
a, the orientation direction of the lignocellulose long fibers 1a of the other layers 6b may be different from the orientation direction of the lignocellulose long fibers 1a of the other layers 6b. You may make it mutually different. And lignocellulose filament 1a
Since the strength of the fiberboard is increased in the orientation direction, the strength of the fiberboard can be increased in a plurality of directions in which the lignocellulose long fibers 1a are oriented, and in addition, in the plurality of directions in which the lignocellulose long fibers 1a are oriented. The dimensional stability of the fiberboard can be improved. Since the fiberboard has high overall strength and high dimensional stability, it is suitable for applications such as floor materials, wall materials, and surface materials such as roof materials.

The multilayered fiberboard of the present invention comprises a layer formed of lignocellulose long fiber 1a, a softwood fiber,
It can be formed by laminating layers formed of lignocellulosic short fibers 1b having a fiber length of less than 6 mm, such as hardwood fibers. As described above, when the length of the lignocellulose long fiber 1a is 6 mm or more, the effect of the lignocellulose long fiber 1a entangled with each other increases, and the strength of the layer formed by the lignocellulose long fiber 1a increases. For this reason, when a layer made of the lignocellulose long fibers 1a is laminated, a fiberboard having excellent strength can be formed as compared with a fiberboard made of only the lignocellulose short fibers 1b. In this case, the configuration of the layer composed of the lignocellulose long fibers 1a is not particularly limited. However, as described above, the lignocellulose long fibers 1a are oriented in substantially one direction, and the lignocellulose long fibers 1a are oriented substantially orthogonally. Oriented in two directions or lignocellulose filament 1
can be formed by weaving a. The weight ratio of the lignocellulose long fiber 1a is not particularly limited.

The multilayered fiberboard of the present invention comprises a layer formed by orienting or knitting or weaving the lignocellulosic long fibers 1a in substantially one direction or in two substantially orthogonal directions, and inorganic fibers. It can be formed by stacking layers. By laminating the layer made of the lignocellulose long fiber 1a and the layer made of the inorganic fiber in this manner,
It is possible to form a fiberboard having excellent strength as compared with an inorganic fiberboard made of only inorganic fibers.

In general, an inorganic fiber plate (a layer made of inorganic fibers) has an advantage that the dimensional change of the inorganic fibers due to moisture is extremely small, so that it has an advantage of being excellent in dimensional stability, but has a disadvantage that it is inferior in strength properties. Therefore, by combining the layer made of the lignocellulose long fiber 1a and the layer made of the inorganic fiber, in addition to the excellent dimensional stability of the layer of the inorganic fiber, the lignocellulose long fiber 1a is oriented in substantially one direction or two directions substantially orthogonal to each other. Since the effect of improving the strength by knitting or knitting or weaving can be expected, a fiberboard having excellent strength and dimensional stability can be formed. As the inorganic fiber layer, a normal inorganic fiber plate can be used. Examples of the type of the inorganic fiber include glass wool fiber, rock wool fiber, and calcium silicate fiber, and are not particularly limited.

Further, the multilayer fiberboard of the present invention can be formed so that the density inside (substantially at the center) is lower than the density near the surface. Since the fiberboard of the present invention is obtained by hot pressing, internal stress remains particularly in the thickness direction. Therefore, under the conditions of water absorption and moisture absorption, the dimensional change of the compressed fiber is caused along with the decrease in the adhesiveness, and the fiber board undergoes thickness expansion (expansion in the thickness direction). The thickness expansion is greatly affected by the compression ratio, that is, the density after forming the fiberboard. for that reason,
As a measure for improving the dimensional stability in the thickness direction, a reduction in compression ratio and a decrease in density can be cited. However, simply reducing the density of the fiberboard greatly reduces the performance in terms of strength.

Therefore, the fiberboard is formed so that the density inside is lower than the density near the surface. Even with such a configuration, the strength of the fiberboard is more dependent on the strength near the surface than on the inside, so that the strength of the fiberboard can be maintained even when the density inside is lower than the density near the surface. Since the lignocellulose long fiber 1a is used as a raw material, the strength of the fiberboard is increased, so that high strength can be maintained as the fiberboard even when the inside density is reduced. By reducing the internal density, the fiberboard can be reduced in weight while maintaining high strength, and at the same time, the dimensional stability in the thickness direction of the fiberboard can be improved. And a fiber board having excellent dimensional stability in the thickness direction. Since this fiberboard has the above-mentioned performance, it is suitable for applications such as surface materials such as flooring materials, wall materials, and roofing materials. In addition, the vicinity of the surface refers to a portion of 3 to 40% of the entire thickness of the fiberboard. Above all, when it is set in the range of 3 to 20%, the above effect is more exhibited.

As the form of the fiber board whose density is reduced from the vicinity of the surface of the fiber board to the inside of the fiber board, a multi-layer fiber board in which the density of the surface layer made of lignocellulose long fibers 1a is increased, or FIG. As shown in FIG. 12, a multi-layer fiberboard in which the density of the layer 3 in which the lignocellulose long fibers 1a are oriented is increased. At that time, a structure having a higher density of the surface layer has higher strength as a fiber board. In the fiber plate, the density of the surface layer as a surface portion is a 0.4~1.2g / cm ^3, an internal density fiberboard is 0.2 to 0.8 g / cm ^3, further, the overall density Is 0.3 to 1.0 g / cm ³ , an effect of improving strength by the surface layer and an effect of improving dimensional stability by lowering the density of the inner layer can be obtained. The weight ratio between the surface layer and the inner layer is appropriately set depending on the required strength and dimensional stability.

The form of the fiberboard whose density is reduced from the vicinity of the surface of the fiberboard to the substantially central portion of the fiberboard is not limited to the above-mentioned laminated structure. The weight composition ratio of the fiber 1a and the form of the composite can be appropriately selected, and an optimal design can be made according to the intended performance.

FIG. 16 shows another embodiment. The fiberboard is formed by independently arranging a plurality of fiber bundles 8 each having the lignocellulosic long fibers 1a oriented in one direction in a continuous phase 36 inside the fiberboard, and then compounding them. By providing the fiber bundle 8 in which the lignocellulose long fibers 1a are oriented in one direction inside the fiberboard,
The strength of the fiberboard is increased by the strength of the fiber bundle 8 oriented in one direction. Therefore, the strength of the fiberboard can be increased in the orientation direction of the fiber bundle 8 of the lignocellulosic long fiber 1a.
The dimensional stability of the fiberboard in the orientation direction of the fiber bundle 8 of a can be increased.

Examples of the type of fibers forming the continuous phase 36 inside the fiber board include lignocellulosic short fibers 1b having a fiber length of less than 6 mm, such as softwood fibers and hardwood fibers, but are not particularly limited. Further, the weight ratio of the fiber bundle 8 in which the lignocellulose long fibers 1a are oriented in one direction is not particularly limited, but is preferably 5 to 95% of the whole.

In the present invention, the formation of a multilayered fiberboard can be carried out as follows. First, the adhesive 2 is added to the fiber 1 composed of the lignocellulose long fiber 1a alone or the lignocellulose long fiber 1a and the lignocellulose short fiber 1b and uniformly dispersed. The amount of the adhesive 2 added to the fiber 1 can be set at 2 to 30% by weight, preferably 8 to 15% by weight. Adhesive 2
If the added amount of is less than 2% by weight, the fiber 1 cannot be firmly bonded, and the strength of the fiberboard may be reduced. If the added amount of the adhesive 2 exceeds 30% by weight,
The adhesive 2 may be consumed wastefully or a large amount of heat may be required to cure the adhesive 2, which may be disadvantageous in cost.

Next, the fibers 1 in which the adhesive 2 is dispersed are put into a mold so as to be stacked in layers to form an aggregate. Next, the assembly is taken out of the mold and placed between the hot plates. Next, heat and pressure are applied to the aggregate by a hot plate to perform hot-press molding, the aggregate is formed into a plate shape, and the adhesive 2 in the aggregate is cured to bond the fibers 1 to each other, thereby forming a multilayer. Can be formed. The temperature, time and pressure at the time of hot pressing are appropriately set depending on the type of the adhesive 2 and the thickness and density of the fiberboard. For example, the temperature is 20 to 180 ° C, preferably 100 to 150 ° C. Can be set. As a pressing method at the time of hot pressing, a batch-type flat plate press, a continuous press, or the like can be employed, but is not particularly limited.

In this manufacturing method, after each layer is laminated to form an aggregate, by applying heat, pressure, or the like,
Since hot pressing is performed in a plate shape, the adhesion between the layers is increased, and a fiber board having excellent strength and dimensional stability is obtained, which is preferable.

As another method of forming a multilayer fiber board in the present invention, an adhesive 2 is dispersed in a fiber 1 in the same manner as described above, and then the fiber 1 in which the adhesive 2 is dispersed is molded. To form an aggregate. Next, the assembly is taken out of the mold and placed between the hot plates. Next, heat and pressure are applied to the aggregate by a hot plate to perform hot-pressure molding, and the aggregate is formed into a plate shape, and the adhesive 2 in the aggregate is cured to form the fibers 1.
A layer body is formed by bonding together. Next, a multilayer fiberboard can be formed by stacking and bonding a large number of layers.

In this manufacturing method, the layers to be each layer are individually formed by applying heat, pressure, and the like, and after a plurality of the layers are laminated, the layers are bonded. In addition, it is preferable because it is possible to precisely control the density and to obtain a fiber board having excellent strength and improved dimensional stability.

[0084]

EXAMPLES Examples of the fiberboard according to the present invention will be specifically described below.

Example 1 A fiber obtained by defibrating the oil palm fruit portion was cut into a length of 100 mm to obtain an oil palm fruit portion long fiber. Next, 445.5 g of oil palm fruit long fiber was added to
0.5 g of a phenolic powder adhesive was added and dispersed. Next, oil palm fruit long fibers were stacked in a 300 × 300 mm formwork to form an aggregate. After this assembly was placed between hot plates, a 9 mm distance bar was sandwiched between the hot plates and hot pressed to obtain a fiberboard. The conditions for the hot pressing were a pressing temperature of 160 ° C., a pressing pressure of 50 kg / cm ² , and a pressing time of 5 minutes. Table 1 shows these conditions.

The physical properties of the obtained fiberboard were measured according to JIS A 59
06 (medium fiber board) and JISA 1437 (moisture resistance B method of moisture resistance test method for building interior boards). Table 2 shows the results.

In Table 2, the rate of change in the length direction during moisture absorption and the rate of change in the width direction during moisture absorption are the length of the fiberboard after 7 days in a thermo-hygrostat set at 40 ° C. and 90% humidity. And the rate of change in the width direction.

Example 2 A fiber obtained by defibrating a coconut fruit part was cut into 100 mm to obtain a coconut fruit part long fiber. Next, to 445.5 g of coconut fruit long fiber,
81 g of a 50% aqueous dispersion of an isocyanate-based adhesive was added and dispersed. Next, an aggregate was formed using the coconut fruit part long fiber in the same manner as in Example 1, and this was hot-pressed to obtain a fiberboard. The same test as in Example 1 was performed on this fiberboard. The preparation conditions are shown in Table 1, and the results are shown in Table 2.

Example 3 Fibers obtained by defibrating the oil palm fruit part were cut into 10 mm to obtain oil palm fruit part long fibers.
Next, an adhesive 2 prepared by adding 1 part by weight of ammonium chloride as a hardening agent to 100 parts by weight of a urea melamine-based adhesive to 445.5 g of oil palm fruit section long fibers was used.
81 g of a 0% aqueous dispersion was added and dispersed. Next, an aggregate was formed using this oil palm fruit part long fiber in the same manner as in Example 1, and this was hot-pressed to obtain a fiberboard. The same test as in Example 1 was performed on this fiberboard. Table 1 shows creation conditions
Table 2 shows the results.

Example 4 Fibers obtained by defibrating the oil palm petiole were cut into 100 mm to obtain oil palm petiole long fibers. Next, 198 g of oil palm petiole long fiber and 247.5 g of softwood fiber having an average fiber length of 2 mm were mixed. The mixing ratio of oil palm petiole long fiber and softwood fiber was set to 4: 5. Next, a 50% aqueous dispersion of adhesive 2 prepared by adding 1 part by weight of ammonium chloride as a curing agent to 100 parts by weight of a urea melamine-based adhesive to a mixture of oil palm petiole long fibers and coniferous fibers is 81 g. Was added and dispersed. Next, an aggregate was formed using the mixture of the oil palm petiole fiber and the softwood fiber in the same manner as in Example 1, and this was hot-pressed to obtain a fiberboard. The same test as in Example 1 was performed on this fiberboard. The preparation conditions are shown in Table 1, and the results are shown in Table 2.

Example 5 A fiber obtained by defibrating the oil palm fruit portion was cut into a length of 100 mm to obtain an oil palm fruit portion long fiber. Next, 445.5 g of oil palm fruit long fiber was added to
0.5 g of a phenolic powder adhesive was added and dispersed. Next, the oil palm fruit long fibers were oriented in one direction by using an orientation device combining a drawing portion composed of six pairs of upper and lower roller pairs and a comb-shaped combing portion.
Next, the oil palm fruit long fibers were arranged in a single direction in a 300 × 300 mm formwork and stacked to form an aggregate. After this assembly was arranged between hot plates, a fiberboard was formed by hot-pressing in the same manner as in Example 1 with a 9 mm distance bar between the hot plates. The same test as in Example 1 was performed on this fiberboard. The preparation conditions are shown in Table 1, and the results are shown in Table 2.

Example 6 A fiber obtained by defibrating kephna was cut into a length of 150 mm to obtain a kenaf long fiber. next,
108 g of a 50% aqueous dispersion of an isocyanate-based adhesive was added to 594 g of kenaf filaments and dispersed. Next, the kenaf long fibers were oriented in one direction by using an orientation apparatus in which a drawing portion composed of six pairs of upper and lower rollers and a comb-shaped combing portion were combined. Next, the kenaf long fibers were arranged in a single direction in a 300 × 300 mm formwork and stacked to form an aggregate. After this assembly was arranged between hot plates, a fiberboard was formed by hot-pressing in the same manner as in Example 1 with a 9 mm distance bar between the hot plates. The same test as in Example 1 was performed on this fiberboard. The preparation conditions are shown in Table 1, and the results are shown in Table 2.

(Example 7) Fiber obtained by defibrating the oil palm fruit part was cut into a length of 10 mm to obtain an oil palm fruit part long fiber. Next, 54.0 g of oil palm fruit long fiber was added to 54.0 g.
g of phenolic powder adhesive was added and dispersed. Next, the oil palm fruit long fibers were oriented in one direction by using an orientation device combining a drawing part composed of six pairs of upper and lower rollers and a comb-shaped combing part.
Next, the oil palm fruit long fibers were arranged in a single direction in a 300 × 300 mm formwork and stacked to form an aggregate. After this assembly was arranged between hot plates, a fiberboard was formed by hot-pressing in the same manner as in Example 1 with a 9 mm distance bar between the hot plates. The same test as in Example 1 was performed on this fiberboard. The preparation conditions are shown in Table 1, and the results are shown in Table 2.

Example 8 A fiber obtained by defibrating kenaf was cut into a length of 100 mm to obtain a kenaf long fiber. next,
To 445.5 g of kenaf filaments, 81 g of a 50% aqueous dispersion of an isocyanate-based adhesive was added and dispersed. next,
The kenaf long fibers were oriented in one direction by using an orientation device combining a drawing portion composed of six pairs of upper and lower roller pairs and a comb-shaped combing portion. Next, the kenaf long fibers were arranged in a single direction in a 300 × 300 mm formwork and stacked to form an aggregate. After this assembly was arranged between hot plates, a fiberboard was formed by hot-pressing in the same manner as in Example 1 with a 9 mm distance bar between the hot plates.
The same test as in Example 1 was performed on this fiberboard. The preparation conditions are shown in Table 1, and the results are shown in Table 2.

Example 9 A fiber obtained by defibrating the oil palm fruit portion was cut into a length of 100 mm to obtain an oil palm fruit portion long fiber. Next, 81 g of a 50% aqueous dispersion of an adhesive prepared by adding 1 part by weight of ammonium chloride as a hardening agent to 100 parts by weight of a urea melamine-based adhesive is added to 445.5 g of oil palm fruit long fibers. And dispersed. Next, the oil palm fruit long fibers were oriented in one direction by using an orientation device combining a drawing part composed of six pairs of upper and lower rollers and a comb-shaped combing part. next,
The oil palm fruit long fiber was spun into a thread using a continuous machine, which is a textile machine, and the thread was knitted into a net. Next, the reticulated oil palm fruit long fibers were arranged in a single direction in a 300 × 300 mm formwork and stacked to form an aggregate. After this assembly was arranged between hot plates, a fiberboard was formed by hot-pressing in the same manner as in Example 1 with a 9 mm distance bar between the hot plates. The same test as in Example 1 was performed on this fiberboard. The preparation conditions are shown in Table 1, and the results are shown in Table 2.

(Example 10) A fiber obtained by defibrating a coconut fruit part was cut into a length of 100 mm to obtain a coconut fruit part long fiber. Next, 36 g of a 50% aqueous dispersion of an isocyanate-based adhesive was added to 198 g of coconut fruit long fiber.
In addition, it was dispersed. In addition, the fiber obtained by defibrating the oil palm petiole was cut into 100 mm to obtain an oil palm petiole long fiber. Next, 110 g of oil palm petiole long fibers and 137.5 g of softwood fibers having an average fiber length of 2 mm were mixed. Next, 45 g of a 50% aqueous dispersion of an isocyanate-based adhesive was added to the mixture and dispersed.

Next, half of the coconut fruit long fiber was 30
Stack in a 0 × 300 mm formwork, then put the mixture of oil palm petiole long fibers and coniferous fibers in the form, then put the other half of the coconut fruit long fibers into the form and stack to form an aggregate. Formed. After this assembly was arranged between hot plates, a fiberboard was formed by hot-pressing in the same manner as in Example 1 with a 9 mm distance bar between the hot plates.

In this fiberboard, the thickness of the surface layer made of coconut fruit long fibers was 2 mm, and the thickness of the inner layer made of a mixture of oil palm petiole long fibers and softwood fibers was 5 mm. The same test as in Example 1 was performed on this fiberboard. The preparation conditions are shown in Table 1, and the results are shown in Table 2.

(Example 11) Fiber obtained by defibrating the oil palm fruit portion was cut into a length of 100 mm to obtain an oil palm fruit portion long fiber. Next, to 198 g of oil palm fruit long fiber, 18
g of phenolic powder adhesive was added and dispersed. Also, 247.5 g of softwood fiber having an average fiber length of 2 mm
2.5 g of phenolic powder adhesive was added and dispersed.

Next, half of the long fiber of the oil palm fruit part was 300
Stacked in a x300 mm formwork, then conifer fibers were placed in the formwork, then the other half of the oil palm fruit long fibers were placed in the formwork and stacked to form an aggregate. After this assembly was arranged between hot plates, a fiberboard was formed by hot-pressing in the same manner as in Example 1 with a 9 mm distance bar between the hot plates.

In this fiberboard, the thickness of the surface layer made of oil palm fruit long fibers was 2 mm, and the thickness of the inner layer made of softwood fibers was 5 mm. The same test as in Example 1 was performed on this fiberboard. The preparation conditions are shown in Table 1, and the results are shown in Table 2.

(Example 12) Fiber obtained by defibrating the oil palm petiole was cut into a length of 100 mm to obtain an oil palm petiole long fiber. Next, an adhesive prepared by adding 1 part by weight of ammonium chloride as a hardening agent to 100 parts by weight of a urea melamine-based adhesive to 198 g of oil palm petiole long fibers was used.
36 g of a 0% aqueous dispersion was added and dispersed. To 247.5 g of softwood fibers having an average fiber length of 2 mm, 45 g of a 50% aqueous dispersion of an adhesive prepared by adding 1 part by weight of ammonium chloride as a curing agent to 100 parts by weight of a urea melamine-based adhesive was added. Dispersed.

Next, the oil palm petiole long fibers were oriented in one direction by using an orientation device combining a drawing portion composed of six pairs of upper and lower rollers and a comb-shaped combing portion. Next, half the amount of oil palm petiole long fiber was reduced to 30
Stacked in a single direction in a 0x300mm formwork,
Next, the coniferous fiber was put into a mold, and then the other half of the oil palm petiole long fiber was stretched in the same direction as the first direction, side by side, and stacked to form an aggregate. After this assembly was arranged between hot plates, a fiberboard was formed by hot-pressing in the same manner as in Example 1 with a 9 mm distance bar between the hot plates.

In this fiberboard, the thickness of the surface layer made of oil palm petiole long fibers was 2 mm, and the thickness of the inner layer made of softwood fibers was 5 mm. The same test as in Example 1 was performed on this fiberboard. The preparation conditions are shown in Table 1, and the results are shown in Table 2.

In Table 2, the length direction of the rate of change in the length direction during moisture absorption refers to the orientation direction in which the fibers are arranged in the surface layer, and the width direction of the rate of change in the width direction during moisture absorption refers to the surface layer. The direction is orthogonal to the orientation direction in which the fibers are arranged.

Example 13 A fiber obtained by fibrillating kenaf was cut into a length of 150 mm to obtain a kenaf long fiber. Next, 24 g of phenolic powder adhesive was added to 264 g of kenaf filaments and dispersed. The oil palm fruit portion was cut to an average fiber length of about 2 mm by a cutting mill cutter to form oil palm fruit short fibers. Next, 30 g of phenol-based powder adhesive was added to 330 g of oil palm fruit short fibers and dispersed.

Next, the kenaf long fibers were oriented in one direction by using an orientation device in which a drawing portion composed of six pairs of upper and lower rollers and a comb-shaped combing portion were combined. Next, half the amount of the kenaf long fiber is 300 × 300 m
m, and then put the coconut fruit short fibers in the form, and then stretch the other half of the kenaf long fibers in the same direction as the beginning and stack them together. Was formed. After this assembly was arranged between hot plates, a fiberboard was formed by hot-pressing in the same manner as in Example 1 with a 9 mm distance bar between the hot plates.

In this fiberboard, the thickness of the surface layer made of kenaf long fibers was 2 mm, and the thickness of the inner layer made of oil palm fruit short fibers was 5 mm. The same test as in Example 1 was performed on this fiberboard. The preparation conditions are shown in Table 1, and the results are shown in Table 2.

In Table 2, the length direction of the rate of change in the length direction during moisture absorption is the orientation direction in which the fibers are arranged in the surface layer, and the width direction of the rate of change in the width direction during moisture absorption refers to the surface layer. The direction is orthogonal to the orientation direction in which the fibers are arranged.

Example 14 A fiber obtained by defibrating a coconut fruit part was cut into a length of 10 mm to obtain a coconut fruit part long fiber. Next, to 264 g of coconut fruit long fiber,
48 g of a 50% aqueous dispersion of an isocyanate-based adhesive was added and dispersed. The oil palm fruit portion was cut to an average fiber length of about 2 mm by a cutting mill cutter to form oil palm fruit short fibers. Next, a 50% aqueous dispersion of an isocyanate-based adhesive was added to 330 g of oil palm fruit short fibers for 60 g.
g and dispersed.

Next, the coconut fruit long fibers were oriented in one direction by using an orientation device combining a drawing portion composed of six pairs of upper and lower roller pairs and a comb-shaped combing portion. Next, half of the coconut fruit long fiber is 30
In a 0 × 300 mm formwork, they are stacked side by side in one direction and the direction perpendicular thereto, and then the oil palm fruit short fibers are put into the formwork,
Next, the other half of the coconut fruit long fiber was stretched in the same manner as the first, and was arranged in one direction and the direction orthogonal thereto to be stacked to form an aggregate. After this assembly was arranged between hot plates, a fiberboard was formed by hot-pressing in the same manner as in Example 1 with a 9 mm distance bar between the hot plates.

In this fiberboard, the thickness of the surface layer made of coconut fruit long fibers was 2 mm, and the thickness of the inner layer made of oil palm fruit short fibers was 5 mm. The same test as in Example 1 was performed on this fiberboard. Table 1 shows creation conditions
Table 2 shows the results.

Example 15 A fiber obtained by fibrillating kenaf was cut into a length of 100 mm to obtain a kenaf long fiber. Next, 36 g of a 50% aqueous dispersion of an isocyanate-based adhesive was added to and dispersed in 198 g of kenaf filaments. Also,
To 247.5 g of softwood fibers having an average fiber length of 2 mm, 45 g of a 50% aqueous dispersion of an isocyanate-based adhesive was added and dispersed.

Next, the kenaf long fibers were oriented in one direction by using an orientation apparatus in which a drawing portion composed of six pairs of upper and lower rollers and a comb-shaped combing portion were combined. Next, half of the kenaf filaments are stacked side by side in one direction and the direction perpendicular thereto in a 300 × 300 mm formwork, and then the softwood fibers are put into the formwork. Similarly, it was stretched and arranged in one direction and its orthogonal direction to form an aggregate. After this assembly was arranged between hot plates, a fiberboard was formed by hot-pressing in the same manner as in Example 1 with a 9 mm distance bar between the hot plates.

In this fiberboard, the thickness of the surface layer made of kenaf long fibers was 2 mm, and the thickness of the inner layer made of softwood fibers was 5 mm. The same test as in Example 1 was performed on this fiberboard. The preparation conditions are shown in Table 1, and the results are shown in Table 2.

Example 16 A fiber obtained by defibrating the oil palm fruit portion was cut into a length of 100 mm to obtain an oil palm fruit portion long fiber. Next, to 198 g of oil palm fruit long fibers, 36 g of a 50% aqueous dispersion of an adhesive prepared by adding 1 part by weight of ammonium chloride as a hardener to 100 parts by weight of a urea melamine-based adhesive was added and dispersed. I let it. Also, 50% of an adhesive prepared by adding 1 part by weight of ammonium chloride as a curing agent to 100 parts by weight of a urea melamine adhesive to 247.5 g of softwood fibers having an average fiber length of 2 mm
45 g of an aqueous dispersion was added and dispersed.

Next, the oil palm fruit long fibers are orientated in one direction using an orienting device that combines a drawing portion composed of six pairs of upper and lower rollers and a comb-shaped combing portion, and then the textile machine. It was spun into a thread with a certain continuous machine. After knitting the thread of this oil palm fruit part long fiber in a net shape, half of it is arranged and stacked in a 300 × 300 mm formwork,
Next, the softwood fiber was put into a mold, and then the other half of the oil palm fruit fiber woven into a net was stacked side by side to form an aggregate. After this assembly was arranged between hot plates, a fiberboard was formed by hot-pressing in the same manner as in Example 1 with a 9 mm distance bar between the hot plates.

In this fiberboard, the thickness of the surface layer made of oil palm fruit long fibers was 2 mm, and the thickness of the inner layer made of softwood fibers was 5 mm. The same test as in Example 1 was performed on this fiberboard. The preparation conditions are shown in Table 1, and the results are shown in Table 2.

(Example 17) A fiber obtained by fibrillating kenaf was cut into a length of 100 mm to obtain a kenaf long fiber. Next, 18 g of a phenolic powder adhesive was added to 198 g of kenaf filaments and dispersed. Next, a drawing portion composed of six sets of upper and lower roller pairs using kenaf filaments,
Alignment was performed in one direction using an alignment device that was combined with a comb-shaped combing portion. Next, divide half of the kenaf filament into 3
In a 00 × 300 mm formwork, they are stacked side by side in one direction and the direction perpendicular to the direction, and then as an inner layer, a size of 300 × 3
A phenol-reinforced rock wool plate (product name: Toughflex board) having a size of 00 × 5 mm, a density of 0.4 g / cm ³ , and a weight of 180 g is overlaid, and then the other half of the kenaf long fiber is stretched in the same manner as in the first direction to make it unidirectional. An assembly was formed by arranging and stacking in the orthogonal direction. After this assembly was placed between hot plates, a fiberboard was formed by hot pressing in the same manner as in Example 1 with a 9 mm distance bar between the hot plates.

In this fiber board, a surface layer made of kenaf long fiber was formed on the surface of the inner layer of the phenol-reinforced rock wool board. The same test as in Example 1 was performed on this fiberboard. The preparation conditions are shown in Table 1, and the results are shown in Table 2.

(Example 18) Fiber obtained by defibrating the oil palm petiole was cut into a length of 100 mm to obtain an oil palm petiole long fiber. Next, to 445.5 g of oil palm petiole long fiber,
40.5 g of a phenolic powder adhesive was added and dispersed.

Next, the oil palm petiole long fibers were oriented in one direction by using an orientation apparatus combining a drawing portion composed of six sets of upper and lower rollers and a comb-shaped combing portion. Next, after dividing the oil palm petiole long fiber into nine equal parts,
A 54 g portion thereof was arranged and stacked in a single direction in a 300 × 300 mm formwork, and then the next 54 g portion was arranged in a direction orthogonal to the initial orientation direction. This process was repeated to stack the oil palm petiole long fibers in nine layers to form an aggregate. After arranging this assembly between hot plates, 9 m
The fiberboard was formed by hot pressing in the same manner as in Example 1 with a distance bar of m interposed therebetween. The thickness of each layer of this fiberboard is 1
mm. The same test as in Example 1 was performed on this fiberboard. The preparation conditions are shown in Table 1, and the results are shown in Table 2.

In Table 2, the length direction of the rate of change in the length direction during moisture absorption is the orientation direction in which the fibers are arranged in the surface layer, and the width direction of the rate of change in the width direction during moisture absorption is the width of the surface layer. The direction is orthogonal to the orientation direction in which the fibers are arranged.

(Example 19) A fiber obtained by fibrillating kenaf was cut into a length of 100 mm to obtain a kenaf long fiber. Next, 81 g of a 50% aqueous dispersion of an isocyanate-based adhesive was added to 445.5 g of kenaf filaments and dispersed. Next, the kenaf long fibers were oriented in one direction by using an orientation apparatus in which a drawing portion composed of six pairs of upper and lower rollers and a comb-shaped combing portion were combined. Next, after dividing the kenaf long fiber into nine equal parts, 58.5 g of the kenaf long fiber was divided into three parts.
In a 00 × 300 mm formwork, they were stacked side by side in a single direction, and then the next 58.5 g was arranged in a direction orthogonal to the initial orientation direction. This process was repeated to stack kenaf long fibers in nine layers to form an aggregate. After this assembly was arranged between hot plates, a fiberboard was formed by hot-pressing in the same manner as in Example 1 with a 9 mm distance bar between the hot plates. The thickness of each layer of the fiberboard was 1 mm. The same test as in Example 1 was performed on this fiberboard. The preparation conditions are shown in Table 1, and the results are shown in Table 2.

In Table 2, the length direction of the rate of change in the length direction during moisture absorption refers to the orientation direction in which the fibers are arranged in the surface layer, and the width direction of the rate of change in the width direction during moisture absorption refers to the surface layer. The direction is orthogonal to the orientation direction in which the fibers are arranged.

Example 20 A fiber obtained by defibrating a coconut fruit part was cut into a length of 100 mm to obtain a coconut fruit part long fiber. Next, 81 g of a 50% aqueous dispersion of an adhesive prepared by adding 1 part by weight of ammonium chloride as a curing agent to 100 parts by weight of a urea melamine-based adhesive was added to 445.5 g of coconut fruit long fibers, and dispersed. I let it. Next, the coconut fruit long fibers were oriented in one direction by using an orientation device combining a drawing portion composed of six pairs of upper and lower roller pairs and a comb-shaped combing portion. Next, the coconut fruit long fibers were divided into three equal parts, and 175.5 g of them were stacked in a unidirectional direction in a 300 × 300 mm formwork. Next, this was placed between hot plates, and then hot-pressed in the same manner as in Example 1 with a 3-mm distance bar between the hot plates to form a layer having a thickness of 3 mm.
Thus, three layers were formed.

Next, 100 parts by weight of a urea melamine-based adhesive was applied to both surfaces of the inner layer of the three layers so that the adhesive amount of the two adhesive layers was 150 g / m ^2. On the other hand, 27 g of a 50% aqueous dispersion of an adhesive prepared by adding 1 part by weight of ammonium chloride as a curing agent was applied. Next, an assembly was formed by arranging the stacked layers between the hot plates so that the orientation direction of the fibers of the layer body serving as the inner layer and the orientation direction of the fibers of the two layer bodies serving as the surface layer were perpendicular to each other. After this assembly was arranged between hot plates, a fiberboard was formed by hot-pressing in the same manner as in Example 1 with a 9 mm distance bar between the hot plates. The same test as in Example 1 was performed on this fiberboard. The preparation conditions are shown in Table 1, and the results are shown in Table 2.

In Table 2, the length direction of the rate of change in the length direction during moisture absorption is the orientation direction in which the fibers are arranged in the surface layer, and the width direction of the rate of change in the width direction during moisture absorption refers to the surface layer. The direction is orthogonal to the orientation direction in which the fibers are arranged.

(Example 21) Fiber obtained by defibrating the oil palm fruit portion was cut into a length of 100 mm to obtain an oil palm fruit portion long fiber. Next, to 198 g of oil palm fruit long fiber, 18
g of phenolic powder adhesive was added and dispersed. Also, 247.5 g of softwood fiber having an average fiber length of 2 mm
2.5 g of phenolic powder adhesive was added and dispersed. Next, the oil palm fruit long fibers were oriented in one direction by using an orientation device combining a drawing portion composed of six pairs of upper and lower roller pairs and a comb-shaped combing portion. Next, half the amount of the oil palm fruit long fiber is 300 × 3
They were arranged in a single direction in a 00 mm formwork. At this time, they were stacked so that the height was different depending on the location. Next, the coniferous fiber was put into a mold so as to overlap the oil palm fruit part long fiber, and an uneven groove was formed on the surface with a spatula. next,
The other half of the oil palm fruit long fiber was stretched in the same direction as the beginning, and was stacked on the above to form an aggregate. After arranging this assembly between hot plates, 9 m
The fiberboard was formed by hot pressing in the same manner as in Example 1 with a distance bar of m interposed therebetween. Example 1 of this fiberboard
The same test was performed. Table 1 shows the preparation conditions and Table 2 shows the results.
Shown in The appearance of the obtained fiberboard is as shown in FIG. 13, and the surface layer in which the oil palm fruit fiber is oriented in one direction,
The lamination boundary surface with the inner layer made of softwood fiber is uneven.

Further, in Table 2, the length direction of the rate of change in the length direction during moisture absorption is the orientation direction in which the fibers are arranged in the surface layer, and the width direction of the rate of change in the width direction during moisture absorption refers to the surface layer. The direction is orthogonal to the orientation direction in which the fibers are arranged.

(Example 22) Fiber obtained by defibrating the oil palm petiole was cut into a length of 100 mm to obtain an oil palm petiole long fiber. Next, 36 g of a 50% aqueous dispersion of an adhesive prepared by adding 1 part by weight of ammonium chloride as a curing agent to 100 parts by weight of a urea melamine adhesive is added to 198 g of oil palm petiole long fiber. I let it. Also, 50% of an adhesive prepared by adding 1 part by weight of ammonium chloride as a curing agent to 100 parts by weight of a urea melamine adhesive to 247.5 g of softwood fibers having an average fiber length of 2 mm
45 g of an aqueous dispersion was dispersed.

Next, the oil palm petiole long fibers were oriented in one direction by using an orientation device combining a drawing part composed of six pairs of upper and lower rollers and a comb-shaped combing part. Next, about 1/9 of the oil palm petiole long fiber was
At the same time as arranging in a single direction in a 00 × 300 mm mold, about 1/9 of the softwood fibers were sprayed into the mold. Subsequently, about 1/9 of the oil palm petiole long fibers were stretched and arranged in the direction perpendicular to the direction in which they were arranged immediately before, and at the same time, about 1/9 of the softwood fibers were sprayed in the mold. The above operation was repeated 9 times, and the oil palm petiole long fibers and the softwood fibers oriented orthogonally were stacked to form an aggregate. After disposing the assembly between the hot plates, the assembly was hot-pressed as in Example 1 with a 9 mm distance bar interposed between the hot plates to form a fiber board as shown in FIG. Example 1 of this fiberboard
The same test was performed. Table 1 shows the preparation conditions and Table 2 shows the results.
Shown in

Example 23 A fiber obtained by fibrillating kenaf was cut into a length of 100 mm to obtain a kenaf long fiber. Next, 36 g of a 50% aqueous dispersion of an isocyanate-based adhesive was added to 198 g of kenaf filament and dispersed. Also,
45 g of a 50% aqueous dispersion of an isocyanate-based adhesive was dispersed in 247.5 g of softwood fibers having an average fiber length of 2 mm.

Next, the kenaf filaments were oriented in one direction by using an orientation device combining a drawing portion composed of six pairs of upper and lower rollers and a comb-shaped combing portion. A bundle of kenaf long fibers having a diameter of about 2 mm was formed by bundling ten fibers. The obtained bundle of kenaf long fibers is stretched in a 300 × 300 mm formwork and arranged in a single direction. At the same time, softwood fibers are sprayed, and a bundle of kenaf fibers oriented in one direction and softwood fibers are stacked and assembled. Formed body. After placing this assembly between hot plates,
Hot pressing was performed in the same manner as in Example 1 with a 9 mm distance bar interposed between the hot plates to obtain a fiber plate as shown in FIG. The same test as in Example 1 was performed on this fiberboard. The preparation conditions are shown in Table 1, and the results are shown in Table 2.

(Example 24) A fiber obtained by fibrillating kenaf was cut into a length of 100 mm to obtain a kenaf long fiber. Next, 18 g of a phenolic powder adhesive was added to 198 g of kenaf filaments and dispersed. In addition, average fiber length 2m
To 123.8 g of m softwood fibers, 11.3 g of a phenolic powder adhesive was added and dispersed.

Next, the kenaf long fibers were oriented in one direction by using an orientation device in which a drawing portion composed of six pairs of upper and lower rollers and a comb-shaped combing portion were combined. Next, の of the kenaf long fiber is 300 × 300 mm
Were stretched in a single mold and arranged in a single direction.
After this was placed between the hot plates, a 2 mm distance bar was sandwiched between the hot plates and hot-pressed in the same manner as in Example 1 to achieve a thickness of 2 mm.
A total of two layered bodies in which kenaf long fibers of 1 mm were oriented in one direction were prepared. Also, after softwood fibers are scattered and stacked in a 300 mm × 300 mm formwork, they are arranged between hot plates, and then hot-pressed with a 5 mm distance bar between the hot plates to form a thickness. A 5 mm layer was made. As a curing agent for 100 parts by weight of a urea melamine-based adhesive on both sides of a softwood fiber layer serving as an inner layer so that the adhesive amount of the two adhesive layers for bonding these three sheets is 150 g / m ^2. 5 of adhesive prepared by adding 1 part by weight of ammonium chloride
Then, 27 g of a 0% aqueous dispersion was applied, and then an assembly was formed by overlapping two kenaf long fiber layers serving as surface layers so that the orientation directions of the layers were parallel. After disposing this assembly between the hot plates, it was hot-pressed in the same manner as in Example 1 with a 9 mm distance bar between the hot plates, and as shown in FIG. A 5 mm thick fiberboard was obtained. The density of the surface layer of the fiberboard is about 0.6 g / cm ^3, the inner layer density inside is about 0.3 g / cm ^3, was about 0.43 g / cm ³ as a overall density. The same test as in Example 1 was performed on this fiberboard. The preparation conditions are shown in Table 1, and the results are shown in Table 2.

(Example 25) A fiber obtained by defibrating the oil palm fruit portion was cut into a length of 100 mm to obtain an oil palm fruit portion long fiber. Next, 15 g of a 50% aqueous dispersion of an isocyanate-based adhesive was added to 165 g of oil palm fruit long fibers and dispersed. In addition, the oil palm fruit part short fiber 2 whose average fiber length was about 2 mm was cut with a cutting mill cutting machine.
To 31 g, 21 g of a phenolic powder adhesive was added and dispersed.

Next, the oil palm fruit long fibers were oriented in one direction using an orientation device combining a drawing portion composed of six pairs of upper and lower rollers and a comb-shaped combing portion. Next, half of the oil palm fruit long fiber is 300 ×
It was stretched in a 300 mm formwork and arranged in one direction and the direction perpendicular thereto. Next, pressure was applied to the oil palm fruit long fiber at room temperature from above and below to form a mat. In this way, two mats having a thickness of about 1 mm were prepared.

After placing one of the mats of the oil palm fruit long fibers in the formwork, the oil palm fruit short fibers were sprayed, and then another mat of the oil palm fruit long fibers was installed. To form an aggregate. After this assembly was placed between hot plates, a fiberboard was formed by hot-pressing in the same manner as in Example 1 with a 9 mm distance bar between the hot plates. In this fiberboard, the thickness of the surface layer composed of oil palm fruit long fibers is 1
mm, the thickness of the inner layer consisting of oil palm fruit short fibers is 7 m
m. The density of the surface layer is about 1.0 g / c.
m ³ , the density of the inner layer was about 0.4 g / cm ³ , and a fiberboard having an overall density of about 0.53 g / cm ³ was obtained. The same test as in Example 1 was performed on this fiberboard. The preparation conditions are shown in Table 1, and the results are shown in Table 2.

(Comparative Example 1) 440.5 g of a softwood fiber having an average fiber length of 2 mm was dispersed with 40.5 g of a phenolic powder adhesive. This was stacked in a 300 × 300 mm formwork to form an aggregate. After this assembly was arranged between hot plates, a fiberboard was formed by hot-pressing in the same manner as in Example 1 with a 9 mm distance bar between the hot plates.
The same test as in Example 1 was performed on this fiberboard. The preparation conditions are shown in Table 1, and the results are shown in Table 2.

Comparative Example 2 To 445.5 g of softwood fibers having an average fiber length of 2 mm, 81 g of a 50% aqueous dispersion of an isocyanate-based adhesive was added and dispersed. This is 300x300
An assembly was formed by stacking in a mm formwork. After this assembly was arranged between hot plates, a fiberboard was formed by hot-pressing in the same manner as in Example 1 with a 9 mm distance bar between the hot plates. The same test as in Example 1 was performed on this fiberboard. The preparation conditions are shown in Table 1, and the results are shown in Table 2.

Comparative Example 3 54.0 g of a phenolic powder adhesive was added to 594.0 g of softwood fibers having an average fiber length of 2 mm and dispersed. This was stacked in a 300 × 300 mm formwork to form an aggregate. After this assembly was arranged between hot plates, a fiberboard was formed by hot-pressing in the same manner as in Example 1 with a 9 mm distance bar between the hot plates.
The same test as in Example 1 was performed on this fiberboard. The preparation conditions are shown in Table 1, and the results are shown in Table 2.

Comparative Example 4 Size 300 mm × 300 ×
A phenol-reinforced rock wool plate (product name: Toughflex board) having a thickness of 9 mm, a density of 0.40 g / cm ³ , and a weight of 324 g was subjected to the same test as in Example 1 except that the fiberboard was used. The preparation conditions are shown in Table 1, and the results are shown in Table 2.

Comparative Example 5 50 g of isocyanate-based adhesive was added to 445.5 g of oil palm fruit fiber having an average fiber length of 2 mm.
81 g of a 1% aqueous dispersion was added and dispersed. This is 300x
An assembly was formed by stacking in a 300 mm formwork. After this assembly was arranged between hot plates, a fiberboard was formed by hot-pressing in the same manner as in Example 1 with a 9 mm distance bar between the hot plates. The same test as in Example 1 was performed on this fiberboard. The preparation conditions are shown in Table 1, and the results are shown in Table 2.

[0145]

[Table 1]

[0146]

[Table 2] As shown in Table 1, Examples 1, 2, 4, 5, 8 to 1
The fiberboards of 2, 15, 16 and 18 to 23 were prepared in Comparative Example 1,
As compared with the fiberboard of No. 2, the density is substantially the same, but the strength is improved. In particular, the effects when the fibers are oriented and laminated are extremely large. Also, when the fiber is oriented,
The dimensional change rate in the direction in which the fibers are oriented is small.

The fiber boards of Examples 6, 7, 13 and 14 have substantially the same density as the fiber board of Comparative Example 3, but
Strength has improved. In particular, the effects when the fibers are oriented and laminated are extremely large. When the fibers are oriented, the dimensional change rate in the direction in which the fibers are oriented is small. Compared with Comparative Example 4, the fiberboard of Example 17 had significantly improved strength due to reinforcement by fiber orientation. The fiberboards of Example 24 and Example 25 have the characteristics of low density and light weight as compared with Comparative Examples 1 and 2, and at the same time, the strength and the dimensional change rate in the direction in which the fibers are oriented are small. Furthermore, by reducing the density of the inner layer, the coefficient of expansion in the thickness direction is also significantly reduced.

Therefore, it was confirmed that the fiberboard obtained by hot-pressing the lignocellulose long fiber 1a of the present invention had excellent strength. In addition, it was confirmed that the fiber board in which the lignocellulose long fibers 1a were oriented and laminated had extremely improved strength and improved dimensional stability during water absorption and moisture absorption.

[0149]

The fiberboard according to claim 1 of the present invention uses a lignocellulose long fiber having a fiber length of 6 mm or more in a fiberboard obtained by bonding a large number of fibers with an adhesive. And lignocellulose long fibers can be entangled with each other, and the strength can be increased as compared with a fiber plate composed of only short fibers.

In the fiber board according to the second aspect of the present invention, since lignocellulose short fibers having a fiber length of less than 6 mm are used as fibers, the entangled portion of lignocellulose long fibers can be reinforced with lignocellulose short fibers. The strength can be further increased, and the surface smoothness can also be increased.

The fiberboard according to the third aspect of the present invention uses lignocellulose long fibers obtained from oil palm, coconut palm, and kenaf, so that lignocellulose long fibers having a strength particularly higher than other lignocellulose long fibers are used. By using this, the strength can be further increased.

In the fiber board according to the fourth aspect of the present invention, the lignocellulose long fibers are oriented in substantially one direction.
This makes it possible to take advantage of the excellent strength of the lignocellulose long fiber in the orientation direction, and can greatly increase the strength in one direction. In addition, it is possible to take advantage of the excellent dimensional stability of the lignocellulose long fiber in the orientation direction, and it is possible to greatly enhance the dimensional stability when absorbing water and moisture in one direction.

In the fiberboard according to the fifth aspect of the present invention, since the lignocellulose long fibers are oriented in two directions substantially orthogonal to each other, it is possible to take advantage of the excellent strength of the lignocellulose long fibers in the orientation direction. The strength in the direction can be made very high. In addition, it is possible to take advantage of excellent dimensional stability in the orientation direction, and it is possible to greatly enhance dimensional stability during water absorption and moisture absorption in two directions.

In the fiber board according to the sixth aspect of the present invention, since lignocellulose long fibers are knitted or woven, the bonding between the lignocellulose long fibers can be extremely increased, and the strength anisotropy is small. The strength can be increased. In addition, it is possible to take advantage of excellent dimensional stability in the orientation direction, and to increase dimensional stability during water absorption and moisture absorption in the in-plane direction.

The fiberboard according to claim 7 of the present invention is composed of a plurality of layers, and at least one layer is formed of lignocellulose filaments. Therefore, the fiberboard can be reinforced with a layer formed of lignocellulose filaments. It is possible to increase the strength.

In the fiberboard according to claim 8 of the present invention, since at least one layer is formed of lignocellulose filaments oriented in substantially one direction, the lignocellulose filaments are aligned in a specific direction. In the above, by aligning the lignocellulose long fibers in one specific direction, it is possible to take advantage of the excellent strength in the orientation direction of the lignocellulose long fibers, and the strength in one direction can be extremely increased. In addition, it is possible to take advantage of excellent dimensional stability in the orientation direction of lignocellulose long fibers,
The dimensional stability during water absorption / moisture absorption in one direction can be made extremely high.

In the fiberboard according to the ninth aspect of the present invention, since at least one layer is formed of lignocellulose filaments oriented in two directions substantially perpendicular to each other, excellent strength in the orientation direction of the lignocellulose filaments is obtained. Can be utilized, and the strength in two directions can be extremely increased. In addition, it is possible to take advantage of excellent dimensional stability in the orientation direction, and it is possible to greatly enhance dimensional stability during water absorption and moisture absorption in two directions.

In the fibrous board according to the tenth aspect of the present invention, since at least one layer is formed of woven or woven lignocellulose filaments, it is possible to extremely strengthen the bonding between the lignocellulose filaments. Thus, the strength can be increased with less anisotropy in strength. In addition, it is possible to take advantage of excellent dimensional stability in the orientation direction, and to increase dimensional stability during water absorption and moisture absorption in the in-plane direction.

In the fibrous board according to the eleventh aspect of the present invention, since the surface layer is formed of lignocellulose long fibers oriented in substantially one direction, the lignocellulose long fibers of the surface layer most dependent on the strength are substantially reduced. By orienting in one direction,
The strength in one direction and the dimensional stability at the time of water absorption and moisture absorption can be increased.

In the fibrous board according to the twelfth aspect of the present invention, the surface layer is formed of lignocellulose long fibers oriented in two directions substantially orthogonal to each other. Are oriented in two directions substantially orthogonal to each other, whereby the strength in two directions and the dimensional stability during water absorption and moisture absorption can be increased.

In the fibrous board according to the thirteenth aspect of the present invention, since the surface layer is formed of woven or woven lignocellulose long fibers, the lignocellulose long fibers of the surface layer most dependent on strength are woven. By weaving, the strength in the in-plane direction and the dimensional stability during water absorption and moisture absorption can be increased.

In the fibrous board according to the fourteenth aspect of the present invention, the boundary between the surface layer and the layer adjacent thereto is formed as a curved surface.
The bonding area between the layers is increased, the bonding strength can be increased, and the strength and the dimensional stability during water absorption and moisture absorption can be improved. The fiberboard according to claim 15 of the present invention, while providing a plurality of layers formed of lignocellulose filaments oriented in substantially one direction, the orientation direction of at least one layer of lignocellulose filaments of the other layer. Since the orientation direction of the lignocellulose long fiber is made different, the strength in the in-plane direction and the dimensional stability at the time of water absorption and moisture absorption can be improved.

[0163] The fiberboard according to claim 16 of the present invention is a laminate of a layer formed of lignocellulose long fibers having a fiber length of 6 mm or more and a layer formed of lignocellulose short fibers having a fiber length of less than 6 mm. As a result, it is possible to reinforce with a layer formed of lignocellulose long fibers, and to increase the strength as compared with a fiber plate consisting of only lignocellulose short fibers.

Since the fiberboard according to the seventeenth aspect of the present invention has a layer formed of inorganic fibers, it can be reinforced with a layer formed of lignocellulose long fibers, and a fiberboard composed of only inorganic fibers. It is possible to increase the strength as compared with.

The fiberboard according to the eighteenth aspect of the present invention is formed so that the density in the central portion is lower than the density in the vicinity of the surface.
The dimensional change in the thickness direction at the substantially central portion can be reduced, and the dimensional stability can be increased.

Since the fiberboard according to the nineteenth aspect of the present invention has therein a fiber bundle in which lignocellulose long fibers are oriented in substantially one direction and bundled, by aligning the lignocellulose long fibers in a specific direction. This makes it possible to take advantage of the excellent strength of the lignocellulose long fiber in the orientation direction, and to increase the strength. Further, it is possible to make use of excellent dimensional stability in the orientation direction, and to enhance dimensional stability during water absorption and moisture absorption.

In the method for manufacturing a fiberboard according to the twentieth aspect of the present invention, a plurality of aggregates of fibers in which an adhesive is dispersed are superimposed and then formed by applying heat or pressure thereto. Can improve the adhesiveness, and can form a fiberboard having excellent strength and improved dimensional stability.

According to a fifteenth aspect of the present invention, there is provided a fiberboard manufacturing method comprising applying a heat or a pressure to an aggregate of fibers in which an adhesive is dispersed, forming a layered body, and bonding a plurality of layered bodies. Since the layers are laminated, the thickness and density of each layer can be precisely controlled, and a fiber board having excellent strength and improved dimensional stability can be formed.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view illustrating an example of an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of the same.

FIG. 3 is a perspective view showing another embodiment of the above.

FIG. 4 is an enlarged sectional view of the same.

FIGS. 5A and 5B are enlarged cross-sectional views.

FIG. 6 is a perspective view showing the orientation device of the above.

FIG. 7 is a perspective view showing another embodiment of the above.

FIG. 8 is a perspective view showing another embodiment of the above.

FIG. 9 is a perspective view showing a sheet of lignocellulose long fibers according to the first embodiment.

FIG. 10 is a perspective view showing another embodiment of the above.

FIG. 11 is a perspective view showing another embodiment of the above.

FIG. 12 is a perspective view showing another embodiment of the above.

FIG. 13 is a perspective view showing another embodiment of the above.

FIG. 14 is a perspective view showing another embodiment of the above.

FIG. 15 is a perspective view showing another embodiment of the above.

FIG. 16 is a perspective view showing another embodiment of the above.

FIG. 17 is a partial cross-sectional view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fiber 1a Lignocellulose long fiber 1b Lignocellulose short fiber 2 Adhesive 3 layer 3a layer 4 Surface layer 5 layer 6 layer 6a layer 7 Boundary surface 8 Fiber bundle

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Ryo Sugawara 1048 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Works Co., Ltd.

Claims (21)

[Claims] 1. A fiber board obtained by bonding a large number of fibers with an adhesive, wherein the fiber board is made of lignocellulose long fiber having a fiber length of 6 mm or more. 2. The fiberboard according to claim 1, wherein lignocellulose short fibers having a fiber length of less than 6 mm are used as the fibers. 3. The fiberboard according to claim 1, wherein lignocellulose long fibers obtained from oil palm, coconut palm, and kenaf are used. 4. The fiberboard according to claim 1, wherein the lignocellulose long fibers are oriented in substantially one direction. 5. The lignocellulose long fiber is oriented in two directions substantially orthogonal to each other.
The fiberboard according to any one of the above. 6. A lignocellulosic long fiber knitted or woven.
The fiberboard according to any one of the above. 7. The fiberboard according to claim 1, wherein the fiberboard is composed of a plurality of layers and at least one layer is formed of lignocellulose long fibers. 8. The fiberboard according to claim 7, wherein at least one layer is formed of lignocellulose long fibers oriented in substantially one direction. 9. The fiberboard according to claim 7, wherein at least one layer is formed of lignocellulosic filaments oriented in two directions substantially orthogonal to each other. 10. The fiberboard according to claim 7, wherein at least one layer is formed of woven or woven lignocellulosic filaments. 11. The fiberboard according to claim 7, wherein the surface layer is formed of lignocellulose long fibers oriented in substantially one direction. 12. The fiberboard according to claim 7, wherein the surface layer is formed of lignocellulose long fibers oriented in two directions substantially perpendicular to each other. 13. The fiberboard according to claim 7, wherein the surface layer is formed of woven or woven lignocellulose filaments. 14. The surface layer and a boundary surface between the surface layer and the adjacent layer are formed as curved surfaces.
The fiberboard according to any one of the above. 15. A plurality of layers formed of lignocellulose filaments oriented in substantially one direction, and the orientation direction of at least one layer of lignocellulose filaments is changed to the orientation direction of lignocellulose filaments of another layer. The fiberboard according to any one of claims 7 to 14, wherein the fiberboard is different from the fiberboard. 16. A laminate comprising a layer formed of lignocellulose long fibers having a fiber length of 6 mm or more and a layer formed of lignocellulose short fibers having a fiber length of less than 6 mm. The fiberboard according to any one of 7 to 15, wherein 17. The fiberboard according to claim 7, further comprising a layer formed of inorganic fibers. 18. The fiberboard according to claim 1, wherein the inner density is lower than the density near the surface. 19. The fiberboard according to claim 1, further comprising a fiber bundle in which lignocellulosic long fibers are oriented in substantially one direction and bundled. 20. A method for producing a fiberboard, comprising: laminating a plurality of aggregates of fibers in which an adhesive is dispersed, and applying heat or pressure to the aggregates. 21. A method for producing a fiberboard, comprising forming a layer by applying heat or pressure to an aggregate of fibers in which an adhesive is dispersed, and bonding and laminating a plurality of layers.