JP6083691B2 - Manufacturing method of laminated plywood - Google Patents

Description

TECHNICAL FIELD The present invention relates to a laminated plywood using an adhesive obtained from oil palm (oil palm), which is a kind of palm, and the production of laminated plywood using an oil palm thin plate formed by peeling off oil palm. It is about the method. This oil palm laminated plywood is used for building floor materials and wall materials, building materials such as partition materials, furniture materials, boats and other boats, other indoor and outdoor decks and play equipment, and exterior and interior of vehicle body bodies. It can be used.
In general, “board” is described as “thin timber thin and flat” or “thin metal or stone thin and flat” according to Kojien, but here, oil palm is made of wood. Although it does not have properties, it has properties close to bamboo, but in oil palm, “thinly flat” is called “thin plate”. Moreover, since there is no term which calls the material of an oil palm in detail, it shall treat like the wood.

  In general, an oil palm tree consists of a single trunk and reaches a height of 10 to 20 m or more. The leaves are wing-shaped and about 3-5 m long, about 30 young trees a year, and about 20 new trees grow over 10 years old. The flower is composed of 3 petals and 3 cocoons, each of which forms a small but dense group, and it takes about 6 months from fruiting until the fruit ripens. The fruit consists of a fleshy flesh (medium peel) with a lot of oil and one seed that is also rich in oil, and the weight of the fruit is about 40-50 kg per bunch.

  It has been cultivated in plantations in Southeast Asia since the latter half of the 19th century. Palm oil, a vegetable oil that can be extracted from oil palm, is more productive and cheaper than other vegetable oils such as soybeans and rapeseed. Therefore, it is used for foods such as margarine and oil for fried foods. It is also widely used in soaps and cosmetics. In recent years, palm oil has been exported from Southeast Asia such as Malaysia and Indonesia to Japan. Therefore, oil palm sometimes refers to the meaning of fats and oils that can be taken from the pulp and seeds and the trunk of the oil palm itself.

In general, oil palm is a collective term for plants classified into the genus Palmae, and is famous for two types: Elaeis guineensis, native to West Africa, and Elaeis oleifera, native to Latin America. Among the cultivars, there is a hybrid of Guinea oil palm and American oil palm. In particular, oil palm (oil palm), which is a kind of palm used as a raw material for vegetable oils and fats, may be referred to as “oil palm”.
In other words, oil palm takes fats and oils from pulp and seeds, and the amount of fats and oils obtained per unit area is superior to other plants, so large-scale plantations mainly in Southeast Asian countries such as Malaysia as commercial crops. Because agriculture is carried out, it may be becoming more prominent to call the oil and fat “oil palm”.
However, in the present invention, it does not mean the oil palm of fats and oils that can be taken from the pulp and seeds, but the trunk of the oil palm itself or the whole plant is called oil palm.

  Patent applications dealing with this oil palm include those disclosed in Patent Document 1 (invention dealing with empty fruit bunch). In patent document 1, the manufacturing method of the building material using oil palm is disclosed. Specifically, after the palm fiber is washed, it is dried so that the dry oil becomes 95%, and the dried palm fiber is broken and cut in units of 1 to 1.5 cm to produce a palm fiber chip. Pulverizing the dried palm fiber with a particle size of 200 mesh, pulverizing bamboo with a particle size of 200 mesh, the palm fiber chip, the palm fiber powder, the bamboo powder, and the bioceramic powder Are prepared in a ratio of 1: 1: 1: 1 to produce a main raw material, a step of extracting fly ash having a particle size of 200 mesh from coal carbide, a flame inhibitor and a heat resistant resin. A step of producing a binder by mixing and melting a flame retardant resin for curing at a ratio of 1: 1, 20-30% by weight of the produced binder, 50-60% by weight of the mixed main raw material, fly ash 2 A step of mixing -25% by weight of powder and kneading in a high liquid state, a step of passing the bend through a forming part that radiates a temperature of 150 to 200 ° C. and baking it first, and the baked molded product Rolling between a plurality of upper roller groups and lower roller groups that are arranged so that the intervals gradually become narrower toward the rear side and gradually rolling to a thin thickness; A step of freezing at 0 to 4 ° C. while passing through a cooling part composed of a number of upper roller groups and a lower roller group, and a step of cutting the molded product by a unit of a certain length by a blade that is raised and lowered by a cutting cylinder It consists of processes.

  In this patent document 1, not only is it harmless to the human body by using palm fiber as the main raw material, but the palm fiber is cut with 1 to 1.5 cm and used together with palm fiber powder. It becomes a solid building material by acting as a temporary bridge with other contents, and antibacterial and deodorizing functions can be realized by bamboo and bioceramics. Further, generation of far infrared rays and anions can be expected without generating mold. And nonflammable waste material can be recycled and manufacturing cost becomes cheap. Furthermore, since no toxic gas is generated from all the compositions, it is said to be highly safe as a building material.

Further, in Patent Document 2 (invention dealing with empty fruit bunches), a plate-like body or a molded body adheres a resin showing rubbery elasticity to oil palm fibers obtained by defibrating the empty fruit bunches of oil palm. A plate-like body or a molded body obtained by compression molding.
Therefore, the oil palm fiber obtained by defibrating the empty fruit bunch of oil palm has a fiber repellent property because, for example, palm oil adheres to the fiber surface compared to other palm fibers such as coconut palm fiber. In addition to being excellent in water, the amount of cellulose and lignin contained in the fiber is relatively large, so that water resistance is excellent. In addition, the oil palm fiber has a high fiber strength, a large fiber diameter, and a long fiber length as compared with other palm fibers such as a coconut fiber, and therefore has excellent dimensional stability. In addition, since the oil palm fiber has large irregularities on the surface and high bending strength, and the entanglement between the fibers is large, the dimensional stability is also enhanced by this. Therefore, this plate-shaped body or molded body has excellent dimensional stability during water absorption and moisture absorption.
And since the irregularities on the surface of the oil palm fiber are large, the resin exhibiting rubber-like elasticity penetrates into the voids on the surface of the oil palm fiber and solidifies or hardens, which acts like a nail or wedge, so-called anchor effect. Therefore, the oil palm fiber is strongly bonded to the resin having rubber-like elasticity. This is also considered to contribute to the improvement of dimensional stability at the time of water absorption and moisture absorption.

The oil palm fiber is superior in elasticity recovery properties, for example, because the fiber has a large rigidity and strength, a large fiber diameter, and a long fiber length, compared to other palm fibers such as coconut fiber. Yes. Further, the oil palm fiber has high fiber bending strength and large entanglement between the fibers, so that the elastic recovery is improved. And the resin which shows rubber-like elasticity has high elastic recovery property. Therefore, a plate-like body or molded body in which oil palm fibers are connected by a resin exhibiting rubber-like elasticity exhibits excellent elastic recovery, good walking feeling and cushioning properties, and good sound insulation.
Since this plate-like body or molded body uses oil palm fiber, less labor is required for defibration, etc., compared to other types of palm fiber, so that manufacturing costs and energy can be reduced, and the product is inexpensive. Become. For example, coconut fiber is immersed in water for a long period of time to soften the coconut shell, and then requires a great deal of energy for a long period of time to be mechanically fibrillated. On the other hand, oil palm defibrates empty fruit bunches that are originally in the form of fibers, so that there is no need for immersion in water, and very little energy is required for defibration. In addition, oil palm fibers have less dusting properties than coconut fibers, and the working environment can be prevented from deteriorating in handling.
Furthermore, since a large gap is formed between the fibers of the oil palm fiber, when a resin exhibiting rubber-like elasticity is supplied by spraying or dipping, the resin adheres evenly to all the fibers through the gap, and the strength distribution is A plate state of being uniform is obtained.

And in patent document 3 (invention of an oil palm trunk), the technique of the plywood which made the adhesive penetrate | infiltrate the fiber exposed on the surface of the several single board bonded together with the adhesive agent is disclosed.
The palm plywood according to Patent Document 3 includes a plurality of single plates bonded with a resin adhesive, and at least one of the plurality of single plates is a palm single plate, and the palm single plate A resin adhesive is infiltrated into the palm fiber exposed on the surface. By using a palm veneer that can be manufactured from a palm trunk of inexpensive waste material, the surface is treated with a resin adhesive without using a veneer veneer with relatively good quality as a face and a back. Therefore, plywood is manufactured at low cost.
Moreover, the palm plywood of patent document 3 uses all the single veneers as palm veneers, uses only palm veneers that can be manufactured from palm trunks of inexpensive waste materials, and bonds them together with a resin adhesive. Also good. The resin adhesive penetrated into the palm fiber at this time is the same type as the resin adhesive that bonds a plurality of single plates. Since the resin adhesive is the same system, the plywood can be manufactured at low cost. Here, the term “same system” includes the same resin adhesive and a composition whose composition (for example, composition ratio) is changed.

And the palm plywood of patent document 3 makes the palm fiber penetrate | infiltrate a resin adhesive after grind | polishing the surface which makes a palm fiber osmose | permeate a resin adhesive, reduces the palm fiber which protrudes from the plywood surface, and resin to palm fiber. The adhesive is permeated. This plywood manufacturing method includes a step of bonding a plurality of veneers with an adhesive, a step of polishing a surface of the plurality of veneers that allows the adhesive to penetrate into exposed fibers, and a polished surface. Applying adhesive to infiltrate the adhesive into the fiber and drying the adhesive, which makes it possible to use a relatively good quality wood veneer as a face and back without using it Plywood can be manufactured at cost.
Thus, according to Patent Document 3, a plywood, a palm plywood, and a plywood manufacturing method that can be manufactured at a low cost without using a single veneer of a relatively good quality tree as a face and a back are disclosed. Yes.

JP 2009-166342 A JP-A-10-8696 JP 2011-68015 A

As described above, Patent Document 1 and Patent Document 2 both use oil palm fibers obtained by defibrating empty fruit bunches of oil palm fruits, and do not directly use oil palm trunks. Absent. However, the trunk of the oil palm is 20 m or more in mature wood, and its utilization is desired because it is a volume ratio occupying 90 to 95% of the whole.
Especially in Southeast Asia such as Malaysia, oil palm is cultivated for the production of palm oil, but the empty fruit bunch after palm oil collection contains a lot of fiber etc. Is used in various applications such as fiber boards. However, palm trunks that are harvested every year are not used effectively and are currently being disposed of.
Patent Document 3 discloses a process in which at least one outermost single plate is bonded to a palm single plate with a plurality of resin adhesives, and the surface of the palm single plate is a resin adhesive on the exposed palm fibers. Disclosed is a method for manufacturing a plywood, comprising: a step of polishing a surface that impregnates a surface; a step of applying a resin adhesive to the polished surface to infiltrate the resin adhesive into palm fibers; and a step of drying the resin adhesive. ing. However, it is unclear how to apply the resin adhesive to the oil palm veneer or to penetrate the exposed palm fiber, and a specific method for manufacturing plywood Is unknown. At least, it is premised on the use of a resin adhesive in which a single plate of oil palm is bonded with a plurality of resin adhesives.

What is commonly called plywood, lauan plywood called veneer wood, Chinese plywood with cinna wood finished on the surface of the lauan plywood, conifer plywood made of pine, cedar, etc. There is. Lauan plywood has been used for a long time, but formaldehyde-based adhesives are used for the bonding, and the vaporized component is a cause of sick house syndrome that adversely affects the human body. Therefore, not only the shortage of raw materials, but also the formaldehyde adhesive is disliked. The same is true for China plywood because it uses Lauan plywood. In addition, softwood plywood has a problem in that a large number of cracks are formed in the thin plate, and the use of an adhesive must be increased.
Therefore, the presence of a multilayer plywood that suppresses the use of formaldehyde-based adhesives that cause sick house syndrome is desired. In addition, when an adhesive different from a formaldehyde adhesive that causes sick house syndrome is used, the cost increases.

  Therefore, the present invention has been made to solve such a problem, the cost of the material to be used is small, the cost is reduced, and the use of formaldehyde-based adhesive that causes sick house syndrome is suppressed. An object of the present invention is to provide a method for producing a laminated plywood that uses components that are inherently present.

A method for manufacturing a laminated plywood according to the invention of claim 1 is to form a plurality of oil palm trunks having a predetermined thickness by peeling them with a rotary lace blade while rotating a predetermined length of an oil palm trunk in its circumferential direction. Drying the formed oil palm thin plate, laminating a plurality of dried oil palm thin plates in a predetermined state, heating to raise the temperature of the laminated oil palm thin plate after the laminating step, the heated In a state where the laminated oil palm thin plate is restricted from extending in a direction parallel to the surface of the oil palm thin plate, a compression force in a direction perpendicular to the surface of the oil palm thin plate is applied and compressed for a predetermined time, The oil palm thin plate compressed for a predetermined time in the compression step is cooled, fixed, and decompressed by lowering the temperature supplied in the heating step.
Here, the thin plate step includes a step of forming a plurality of oil palm thin plates by peeling the oil palm trunk having a predetermined length in a circumferential direction with a blade to a predetermined thickness while rotating the oil palm trunk in the circumferential direction. .
The drying step is a step of drying the oil palm thin plate formed in the thin plate step.
Moreover, the said lamination process laminates | stacks the said oil palm thin board dried at the said drying process in a predetermined | prescribed state, The lamination order position is not specifically limited.
And the said heating process heats so that the temperature of the said laminated | stacked oil palm thin board may be raised after the said lamination | stacking process.
Further, the compression step is performed on the surface of the oil palm thin plate while restricting the laminated oil palm thin plate heated by the heating step from extending in a direction parallel to the surface of the oil palm thin plate. On the other hand, compression is performed for a predetermined time by applying a compressive force in a right angle direction.
Furthermore, the said fixing process lowers the temperature which supplied the said oil palm thin board compressed by the said compression process for the predetermined time at the said heating process, and fixes the compressed form.

By the way, as the trunk of the oil palm, its varieties, production areas, etc. are not particularly limited. Therefore, a trunk that is scheduled to be discarded is used, but a trunk that is young may be used.
Moreover, the drying method of the thin plate obtained as the oil palm thin plate is not particularly limited, and may be naturally dried or artificially dried, but artificial drying is more expensive. is there.
Here, wood such as Lauan, which is generally used for building materials, forms a secondary xylem composed of cell (dead cell) tissue in which the movement of water and nutrients has stopped, whereas oil palm The trunk of this is composed only of primary tissues of vascular bundles and parenchymal cells, and most of the cells centering on parenchymal cells are living cells in which water and nutrients are actively transferred, so the water content is extremely high. In addition, the oil palm trunk is rich in saccharides (eg, fructose, glucose, fructooligosaccharides, inositol, etc.). For this reason, when the thickness of the oil palm thin plate from the oil palm trunk is large, bacteria such as mold are proliferated and corroded easily by natural drying, and productivity and commercial value are impaired. On the other hand, when artificially drying, the cost becomes high. Therefore, according to the experimental study by the present inventors, by reducing the thickness of the oil palm thin plate obtained from the oil palm trunk within the range of 3 mm to 35 mm, the product value and productivity are reduced by bacteria such as mold even in natural drying. It has been confirmed that the cost can be reduced without incurring cost.

Furthermore, laminating a plurality of sheets in the direction perpendicular to the fiber direction of the oil palm thin plate means laminating on a surface perpendicular to the fiber length direction, that is, a surface other than the end face and the end face of the fiber. The layers may be laminated with the same direction, the fiber directions may be perpendicular to each other, and the number of the sheets may be an odd number or an even number. The number of stacked layers may be two or more.
In addition, heating and compressing the entire thickness of the dried oil palm sheet by applying an external force in a direction perpendicular to the fiber direction in the heated state means compressing in the stacking direction of the oil palm sheet and at least the mouth end surface This means that the area corresponding to is reduced, that is, the so-called compression direction is specified and compacted. This consolidation process can be formed by, for example, setting the moisture content of the oil palm thin plate to be substantially uniform, heating and compressing under a predetermined condition, and fixing, and this is a predetermined condition at this time. The temperature, pressure, time, compression speed, and the like are determined in advance by experiments or the like using the target compression rate as a parameter.

And the said oil palm thin board was joined by the said compaction process, and the whole air-dry specific gravity is 0.8 or more, and the thin board laminated | stacked on several sheets was joined by the compaction process, without using an adhesive agent. It means that the air-drying specific gravity of the whole laminated wood in the state is 0.8 or more.
Here, the air-dry specific gravity is the specific gravity when the wood is dried in the air, and is usually expressed by the specific gravity when the moisture content is 15%, and water having the same volume as the weight when the wood is dried. It is the value which compared the weight of. The larger the value, the heavier, the smaller the lighter.
In addition, the air-drying specific gravity of the entire compacted by compaction processing is 0.8 or more, as a result of repeated experiments by the present inventors, the oil palm thin plate is highly compressed and the air-drying specific gravity is 0.8 or more. As a result, the properties of oil palm are changed and the hardness is remarkably increased, and the physical stability is increased with less variation in physical properties and characteristic values such as strength, hardness, dimensional change rate, and the like. It was set based on knowledge. In other words, it is a characteristic area where the strength and hardness are increased by compression and the variation in physical properties is reduced, indicating that it is a characteristic of compacted wood. In which the air-drying specific gravity does not exceed 0.8 is not included. More preferably, when the air-dry specific gravity is 0.9 or more, the hardness is remarkably increased, and the physical stability is further increased due to less variation in physical properties and characteristic values such as hardness and dimensional change rate. become.
The air-drying specific gravity is ultimately set in consideration of cost, required strength and hardness, etc., but if the compression ratio is too high to increase the air-drying specific gravity, the wood is composed. Since the fiber to be broken is broken and a commercial property is lost, the value of the air-dry specific gravity measured immediately before the crack is generated by high compression becomes the maximum value. That is, the upper limit of the air-dry specific gravity in the present invention is the compression limit of the compacting process, and the maximum value is a finite value. In addition, the numerical value of the air-dry specific gravity is not required to be strict, but is approximate. Naturally, it is an approximate value including an error by measurement or the like, and does not deny an error of several percent.

The method for producing a laminated plywood according to the invention of claim 2 includes a step of forming a plurality of oil palm thin plates by stripping a predetermined length of oil palm trunk to a predetermined thickness with a rotary race blade while rotating the oil palm trunk in its circumferential direction; It consists of a process of peeling a trunk other than a predetermined length of oil palm in a circumferential direction while rotating a trunk other than a predetermined length with a blade to a predetermined thickness and forming it into one or more thin plates. A plurality of the dried oil palm thin plates and other peeled thin plates are laminated in a predetermined state, and the temperature of the laminated oil palm thin plate and other peeled thin plates is increased. The heated oil palm thin plate and other peeled thin plates are heated in parallel and extend in a direction parallel to the surfaces of the oil palm thin plate and other peeled thin plates. The oil palm thin plate and the other peeled thin plate compressed for a predetermined time by applying a compressive force in a direction perpendicular to the surface of the oil palm thin plate and the other peeled thin plate while regulating The temperature supplied in the heating step is lowered to be cooled and fixed.
Here, the thin plate step includes a step of forming a plurality of oil palm thin plates by peeling a predetermined length of the oil palm trunk from the outer periphery to a predetermined thickness with a rotary race blade while rotating the oil palm trunk in the circumferential direction, and a predetermined length of oil. It consists of a process of rotating a trunk other than palm in the circumferential direction with a rotary lace cutter to a predetermined thickness from the outer periphery to form a thin sheet, and is not limited to one that progresses simultaneously. It may be formed at the position.
The drying step is to dry the oil palm thin plate and other peeled thin plates formed in the thin plate step, and the oil palm thin plate and other peeled thin plates may be dried separately or simultaneously dried. Also good.
Moreover, the said lamination | stacking process laminates | stacks the oil palm thin board dried at the said drying process, and another several peeled thin board in a predetermined state, The lamination order position is not specifically limited.
And the said heating process is heated so that the temperature of the said laminated | stacked oil palm thin board and other peeled thin board may be raised after the said lamination process.
Further, the compression step extends in a direction parallel to the surfaces of the oil palm thin plate and the other peeled thin plate to the laminated oil palm thin plate and the other peeled thin plate heated by the heating step. Compressing the oil palm thin plate and other peeled thin plate while applying a compression force in a direction perpendicular to the surface of the oil palm thin plate and compressing for a predetermined time.
Furthermore, the immobilization step is a compressed form in which the oil palm thin plate and the other peeled thin plate compressed in the compression step for a predetermined time are cooled by lowering the temperature supplied in the heating step. It is to be fixed.

The thin plate step in the method for manufacturing a laminated plywood according to the invention of claim 3 is such that the number of the oil palm thin plates is larger than the number of thin plates other than the oil palm.
Here, the fact that the number of the oil palm thin plates is larger than the number of the thin plates other than the oil palm means that the amount of the resin component and the sugar component contained in the oil palm thin plate is 1/2 that of the conventional one. It is as follows.

The lamination process of laminating a plurality of the thin plates in the method for producing a laminated plywood according to the invention of claim 4 is such that the fiber directions are the same as each other.
Here, the lamination in which the fiber directions are the same means that the fibers are laminated so that the length directions of the fibers are the same on the opposing surfaces of the fibers.

The laminating step of laminating a plurality of the thin plates in the method for producing a laminated plywood according to the invention of claim 5 is such that the fiber directions are orthogonal to each other.
Here, the lamination in which the fiber directions are orthogonal to each other means that the fibers are laminated so that the fiber directions are orthogonal to each other on the facing surface.

The moisture content of the oil palm thin plate by the drying step of the method for manufacturing a laminated plywood according to the invention of claim 6 is dried within a range of 5% to 30%.
Here, as a result of repeated experiments by the present inventors, in general, when the water content is less than 5%, sufficient chemical change cannot be caused by consolidation, and the surface is too dry. As a result, a phenomenon in which the compressed portion returns to the original thickness when it gets wet with water after the consolidation process, that is, a so-called immobilization defect, is likely to occur. On the other hand, when the moisture content exceeds 30%, it is difficult to dry uniformly to the inside, and an internal pressure that resists the pressing pressure is generated by the action of high-temperature and high-pressure steam contained in the wood in the consolidation process of compaction processing, After removing the pressure, it was found that damage such as cracking / breaking (puncture), deformation / bulging, and the like were likely to occur, and the present invention was completed based on this finding. More preferably, the water content of the oil palm sheet, lauan sheet, china sheet, and conifer sheet is in the range of 10% to 20%.

The heating temperature in the heating step of the method for manufacturing a laminated plywood according to the invention of claim 7 is in the range of 110 ° C to 170 ° C.
Here, as a result of repeated experiments, the inventors of the present invention have found that if the heating temperature is too low, sufficient compacting cannot be performed, resulting in immobilization failure or poor bonding between layers, while on the other hand, if the heating temperature is too high. Since the surface is carbonized and changes to black, the color tone and the unique fragrance inherent to the plant may be impaired, or the material may be deteriorated to reduce the strength and become brittle. It is necessary to perform consolidation within a range of 170 ° C.

The predetermined compression pressure in the compression step of the method for manufacturing a laminated plywood according to the invention of claim 8 is in the range of 1 to 100 kg / cm ² .
Here, as a result of repeated experiments, the inventors have found that if the applied pressure is too low, sufficient compacting is not performed, and immobilization failure or poor connection between woods occurs. On the other hand, if the pressure is too high, the surface may crack. Therefore, the present inventors have found that a pressurizing condition within a range of 1 to 100 kg / cm ² is appropriate, and have completed the present invention based on this finding. In addition, More preferably, it exists in the range of 10-50 kg / cm < ² >.

The time required for the heating step and the compression step of the method for producing a laminated plywood according to the invention of claim 9 is in the range of 10 minutes to 120 minutes.
Here, the present inventors are able to prevent immobilization and poor bonding between woods by being sufficiently heat-compressed, and on the processing time of heat-compression that can prevent carbonization of the surface due to the treatment time being too long. As a result of earnest experimental research, it was found that although the time varies depending on the material of the thin plate, the time condition within the range of 10 minutes to 120 minutes for applying an appropriate temperature is appropriate, and based on this finding This completes the present invention. In addition, Preferably, predetermined time is in the range of 20 minutes-30 minutes.

According to the manufacturing method of the laminated plywood according to claim 1 , the oil palm trunk having a predetermined length is rotated in the circumferential direction in the thin plate process, and is peeled with a blade from the outer periphery to a predetermined thickness by a rotary race to form a plurality of oil palm thin plates. Form. The oil palm thin plate formed in the thin plate step is dried in the drying step, a plurality of dried oil palm thin plates are laminated in a predetermined state in the lamination step, and heated to increase the temperature of the laminated oil palm thin plate. Applying a compressive force in a direction perpendicular to the surface of the oil palm thin plate while restricting extending in a direction parallel to the surface of the oil palm thin plate to the heated oil palm thin plate heated in the process Then, the oil palm thin plate compressed for a predetermined time in the compression step and cooled for a predetermined time in the compression step is cooled and fixed by lowering the temperature supplied in the heating step.

Since the trunk of the oil palm has no nodes and no annual rings, when creating a thin plate by stripping it from the outer periphery to a predetermined thickness with a rotary race, a homogeneous thin plate is obtained, and as a result, the laminated plywood made of the thin plate is homogeneous It becomes. Moreover, since the joining force is changed by the resin component and sugar component contained in the trunk of the oil palm itself depending on the applied temperature and compressive force, an arbitrary adhesive force can be obtained by controlling the applied temperature and compressive force.
In addition, the temperature of the oil palm sheet laminated after the lamination process is heated in the heating process, and the laminated oil palm sheet heated in the compression process is parallel to the surface of the oil palm sheet. Since the compression is applied for a predetermined time by applying a compression force in a direction perpendicular to the surface of the oil palm thin plate while restricting extension, the compression force applied in the compression process is applied to the surface of the oil palm thin plate. Elongation to escape in the parallel direction is limited, the compressive force of all laminated oil palm sheets can be used effectively, and the outer dimensions of the oil palm sheets can be made uniform, and all the oil palm sheets can be made uniform. The compression rate of the oil palm can be made uniform, and no waste is produced from the plurality of oil palm thin plates during production.

  The plurality of thin plates are joined by a resin component and a sugar component contained in the trunk of the oil palm itself to form the laminated plywood, and other synthetic resins and synthetic rubbers are used as adhesives. Because there is no, you can return to nature. The oil palm leaves, empty fruit bunches, roots, etc. at this time are cut into chips and may be treated by an organic waste fermentation treatment method that is composted (composted) by aerobic bacteria treatment, In particular, empty fruit bunches may be subjected to other practical treatments. Moreover, it can also grind | pulverize finely and can extract components, such as a cellulose, hemicellulose, and lignin, and can also use it. Furthermore, because of the compressive force when joined by the resin component and sugar component contained in the trunk of the oil palm itself, there is almost no void in the thin plate, resulting in a dense structure, water resistance, and waterproofing. It is rich in insect repellent and has a long service life even when used as a building material. In addition, since the thin plate of an oil palm trunk has the capability to shape | mold into the uneven surface opposite to an uneven surface, the joining here also includes the mechanical joining using the shaping capability.

In this way, a plurality of oils each having a thickness of 1 mm or more when the oil palm trunk having a predetermined length is formed by peeling it to a predetermined thickness with a rotary race while rotating it in the circumferential direction and then compacting it. Palm palm can be compressed and fixed at the same time and joined together. In particular, the temperature of the oil palm sheet laminated after the lamination process is heated in the heating process, and the laminated oil palm sheet heated in the compression process is parallel to the surface of the oil palm sheet. Since the compression is applied for a predetermined time by applying a compression force in a direction perpendicular to the surface of the oil palm thin plate while restricting extension, the compression force applied in the compression process is applied to the surface of the oil palm thin plate. Elongation to escape in parallel direction is limited, the compressive force of all laminated oil palm laminae can be used effectively, and the compressibility of all oil palm laminae can be made uniform, There is no waste from the oil palm sheet.
Therefore, using the resin component and sugar component contained in the oil palm thin plate, a multilayer plywood bonded with natural products can be obtained, and the loss of the material used is reduced, the cost is reduced, and formaldehyde adhesion causing sick house syndrome The use of the agent is suppressed, and a laminated plywood using components inherently possessed by oil palm is obtained.

According to the method for producing a laminated plywood according to claim 2 , a step of forming a plurality of oil palm thin plates by peeling a predetermined length of oil palm trunk from the outer periphery to a predetermined thickness with a blade while rotating the oil palm trunk in the circumferential direction. , And a thin plate process comprising a step of rotating a trunk other than a predetermined length of oil palm in the circumferential direction with a rotary race to a predetermined thickness from the outer periphery with a blade to form one or more thin plates (for example, lauan thin plate) The oil palm thin plate and other stripped thin plates formed in step 1 are dried in a drying step. A plurality of oil palm thin plates and other stripped thin plates dried in the drying step are laminated in a predetermined state in a lamination step. After the laminating step, the laminated oil palm thin plate and other peeled thin plates are heated in a heating step to increase the temperature, and the heated oil palm thin plate and other peeled thin plates are heated to oil palm. Applying a compressive force in a direction perpendicular to the surfaces of the oil palm thin plate and the other peeled thin plate while restricting extending in a direction parallel to the surfaces of the thin plate and the other peeled thin plate, for a predetermined time in the compression step. The oil palm thin plate and the other peeled thin plate that have been compressed and compressed for a predetermined time in the compression step are cooled and fixed by lowering the temperature supplied in the heating step in the fixing step.

  Therefore, a plurality of oil palm thin plates each having a thickness of 1 mm or more when a predetermined length of an oil palm trunk is formed by peeling it to a predetermined thickness with a rotary race while rotating in the circumferential direction and then compacting it. And one or more of a lauan thin plate, a Chinese thin plate, or a coniferous thin plate formed by peeling a predetermined length of lauan or china or coniferous tree trunks in the circumferential direction while peeling off to a predetermined thickness from the outer periphery with a rotary race Are arranged so as to face the oil palm thin plate, and the whole thin plate is compressed or fixed simultaneously or separately and integrally joined. Therefore, it is possible to arrange a plurality of oil palm thin plates and one or more of Lauan thin plate, China thin plate, conifer thin plate facing the oil palm thin plate, compress them, fix them, and join them together Using the resin component and sugar component contained in the oil palm sheet, a multilayer plywood bonded with natural products is obtained. In addition, since this oil palm thin board has the capability to shape | mold into the uneven surface opposite to an uneven surface, the mechanical joining using the shaping capability is also included. Moreover, since one or more of Lauan thin plate, China thin plate, and softwood thin plate can be used as a core material or a design plate, a laminated plywood can be manufactured according to the application.

In addition, the temperature of the oil palm thin plate and other peeled thin plates laminated after the lamination step is heated to increase in the heating step, and the laminated oil palm thin plate and other peeled thin plates heated in the compression step are heated. And applying a compressive force in a direction perpendicular to the surfaces of the oil palm thin plate and the other stripped thin plate for a predetermined time while restricting extending in a direction parallel to the surfaces of the oil palm thin plate and the other stripped thin plate. Because it compresses, the extension that the compressive force applied in the compression process escapes in a direction parallel to the surfaces of the oil palm sheet and other stripped sheets is limited, and compression of all laminated oil palm sheets The force can be used effectively, the outer dimensions of the oil palm sheet and other stripped sheets can be made uniform, and the compression ratio of the whole oil palm sheet should be a value corresponding to the tree species. Can, is not to issue a waste from a plurality of oil palm sheet and other peeled thin plate during manufacture.
Therefore, the use ratio of the resin component and the sugar component contained in the oil palm thin plate is increased, and a multilayer plywood bonded with a natural product is obtained, the loss of the material to be used is reduced, the cost is reduced, and sick house syndrome is caused. The use of formaldehyde-based adhesives is suppressed, and a laminated plywood using the components that oil palm originally has is obtained.

In the thin plate process of the method for producing a laminated plywood according to claim 3, since the number of oil palm thin plates is larger than the number of thin plates other than oil palm, in addition to the effect of claim 2 , at least conventional Compared with the laminated plywood, the use of formaldehyde-based adhesive that causes sick house syndrome can be suppressed to ½ or less.

  The laminating step of laminating a plurality of the thin plates in the method for producing a laminated plywood according to claim 4 has the same fiber direction as each other, and therefore, according to any one of claims 1 to 3. In addition to the effect, the fibers are laminated with the same fiber direction, so that the joining along the length direction of the original trunk is achieved, and the fibers softened in the consolidation process are adjacent to the lamination direction with the same fiber direction. It is easy to get entangled with the fiber and is fixed in the entangled state. That is, the fibers are entangled with each other by the consolidation process, and the bonding strength is increased. Therefore, the mechanical strength is high, and a stable dimensional shape after consolidation is ensured. Furthermore, by laminating the fibers in the same fiber direction, the expansion rate and contraction rate at the joint surface can be made completely the same, and the dimensional shape stability is higher without applying stress. .

  The laminating step of laminating a plurality of the thin plates in the method for producing a laminated plywood according to claim 5 is such that the fiber directions are orthogonal to each other, and therefore, according to any one of claims 1 to 4. In addition to the effects of, even if expansion and contraction force occurs due to changes in ambient environmental conditions after consolidation processing, the fibers interact with each other to prevent warping deformation in a specific direction, and a good balance state, Dimensional shape stability is improved and a tough plate-like laminated plywood is obtained.

  The said drying process in the manufacturing method of the laminated plywood of Claim 6 dries the moisture content of an oil palm thin board in the range of 5%-30%, Therefore, any one of Claims 1 thru | or 5 In addition to the effects described above, cracks, deformation, swelling, rupture and the like are prevented. Therefore, more stable dimensional shape is ensured and the yield is high. Moreover, when the moisture content is in a dry state within a range of 5% to 30%, it is also suitable for joining with a Lauan thin plate, a Chinese thin plate, a conifer thin plate, or the like.

  Since the heating temperature in the said heating process in the manufacturing method of the laminated plywood of Claim 7 was made into the range of 110 to 170 degreeC, it becomes the effect as described in any one of Claims 1 thru | or 7. In addition, it is possible to prevent improper fixing in wood compaction, poor joining between wood, and material deterioration such as surface carbonization and lowering of material strength. In addition, when the heating temperature is in the range of 110 ° C. to 170 ° C., it is also suitable for joining to a Lauan thin plate, a Chinese thin plate, a conifer thin plate, or the like.

Since the predetermined compression pressure by the said compression process in the manufacturing method of the laminated plywood of Claim 8 is made into the range of 1-100 kg / cm < ² >, It is any one of Claims 1 thru | or 7. In addition to the above effects, it is possible to prevent improper fixation, poor joining between woods, and occurrence of surface cracks in consolidation. It was confirmed that there was no problem in joining with Lauan sheet, China sheet, conifer sheet.

  The time required for the heating step and the compression step in the method for producing a laminated plywood according to claim 9 is in the range of 10 minutes to 120 minutes, and therefore the effect according to any one of claims 1 to 8. In addition, it is possible to prevent immobilization defects in the consolidation process, poor bonding between woods, and carbonization of the surface. It was confirmed that there was no problem in joining with Lauan sheet, China sheet, conifer sheet.

FIG. 1 is an explanatory diagram of a thin plate manufacturing process using a rotary race in the method for manufacturing a laminated plywood according to Embodiment 1 of the present invention. FIG. 2 is an explanatory diagram showing a lamination positional relationship of thin plates in the method for manufacturing a laminated plywood according to Embodiment 1 of the present invention. FIG. 3 is an explanatory view showing a thin plate laminating method of the laminated plywood manufacturing method according to Embodiment 1 of the present invention. FIG. 4 is an explanatory view showing a combined state (a), a laminated state (b), and a compressed state (c) of the method for manufacturing a laminated plywood according to Embodiment 1 of the present invention. FIG. 5 is a cross-sectional view showing a schematic configuration of a compacted material manufacturing apparatus employing the method for manufacturing a laminated plywood according to Embodiment 1 of the present invention. 6A and 6B are explanatory diagrams of a method for manufacturing a laminated plywood according to Embodiment 1 of the present invention, in which FIG. 6A is an explanatory diagram of supply of unprocessed wood as a raw material, FIG. (c) is an explanatory diagram according to a sealed heating compression start state, (d) is an explanatory diagram of a vapor pressure control process according to a sealed heating compression state, (e) is an explanatory diagram according to a sealed cooling state, and (f) is a compacted wood ( It is explanatory drawing of taking-out of (consolidation processing material). FIG. 7 is an explanatory view of a frame used in the method for manufacturing a laminated plywood according to Embodiment 1 of the present invention, and is a perspective view (a) and a sectional view (b) taken along a cutting line AA. FIG. 8 is a flowchart illustrating a method for manufacturing the laminated plywood according to Embodiment 1 of the present invention. FIG. 8 is an explanatory diagram of a tensile strength test of the laminated plywood used in the method for manufacturing the laminated plywood according to Embodiment 1 of the present invention. FIG. 10 is an explanatory view showing a lamination positional relationship of thin plates in the method for producing a laminated plywood according to Embodiment 2 of the present invention. FIG. 11 is an explanatory view showing a thin plate laminating method of the laminated plywood manufacturing method according to Embodiment 2 of the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that, in the embodiments, the same symbols and the same reference numerals in the drawings are the same or corresponding functional parts, and therefore, redundant description thereof is omitted here.

[Embodiment 1]
First, when the oil palm trunk WD used in the embodiment of the present invention is cut so that the wood grain and the grid are made, the fibers (vascular bundles) are arranged in a grid pattern. That is, there are no annual rings like Japanese timber and cedar, and 0.4 to 1.2 mm vascular fibers extend in the length direction of the oil palm trunk WD like tatami mats.
The components of oil palm trunk WD are slightly different depending on the place of production, but the difference is slight, generally 30.6% by weight of cellulose, 33.2% by weight of hemicellulose, lignin (total lignin 28.5% by weight = Klarson lignin 24.7% by weight + acid-soluble lignin (3.8% by weight), extracted component 3.6% by weight, ash content 4.1% by weight, Characterization in Chemical Composition of the Oil Palm (Elaeis guineensis) (Journal of the Japan Institute of Energy, 87, 383-388 (2008)).
Visible fibers of 0.4 to 1.2 mm, that is, between the vascular bundle, are united by a resin component such as lignin, a saccharide such as cellulose and hemicellulose, and a small number of pores.

The formation of the oil palm thin plate constituting the laminated plywood according to the present embodiment will be described with reference to FIG.
The oil palm thin plate W cuts a single trunk that has grown for more than 20 years as an oil palm trunk WD of a predetermined length, and sets it in a device called a rotary race that performs peeling in the circumferential direction similar to wig removal of a radish. . Then, the oil palm trunk WD is rotated to perform circumferential stripping with the blade CT. This is a thin plate process in which a predetermined length of the oil palm trunk WD is peeled off from the outer periphery to a predetermined thickness by a rotary race while being rotated in the circumferential direction to form a plurality of oil palm thin plates W.

As shown in FIG. 1, the center of the oil palm trunk WD is rotated so as to be an axis, and a cutter CT having a predetermined width is applied to the outer peripheral side thereof, and a continuous thin plate UWD is formed by so-called stripping similar to wig stripping. . That is, the oil palm trunk WD is cut out from a continuous thin plate, ie, a continuous thin plate UWD, with a predetermined thickness like radish wig peeling. The continuous thin plate UWD is cut to a predetermined length and dried to produce an oil palm thin plate W having a predetermined area and a predetermined thickness.
Oil palm leaves, empty fruit bunches, roots, and the like are cut into chips and treated by an organic waste fermentation treatment method in which they are composted (composted) by aerobic bacteria treatment. In particular, empty fruit bunches may be subjected to other practical treatments. Further, it may be finely crushed, extracted with components such as cellulose, hemicellulose, lignin, etc., and used for joining assistance.

  Usually, drying is started when the continuous thin plate UWD is peeled off. However, drying may be performed after cutting the number of units to make a predetermined laminated plywood PW. In general, since the cutting is performed by a flow operation, it is desirable to start drying at the time when the continuous thin plate UWD is formed from the oil palm trunk WD from the viewpoint of ensuring the drying time. This drying process is a drying process after four oil palm thin plates W2,..., W5 having a predetermined area and a predetermined thickness are cut so as to be superimposed on the pre-pressing multilayer material NW for forming the laminated plywood PW. If it exists, it is desirable because chips at the end of the continuous thin plate UWD are difficult to be produced, but there is no significant difference after the time when the continuous thin plate UWD is formed from the oil palm trunk WD. In any case, the process of drying these oil palm thin plates W is a drying process.

  The process of FIG. 1 is not different for a predetermined length of Lauan or Sina or conifer trunk. A Lawan thin plate, a Chinese thin plate, or a coniferous thin plate formed by peeling a lawan, a Chinese or coniferous trunk in a circumferential direction while rotating it in the circumferential direction, is formed by a similar process.

The oil palm thin plate W having a predetermined area and a predetermined thickness is further cut as shown in FIGS. 2B and 2C, and four oil palm thin plates W2,. .., W5 (specially, when the number of the oil palm thin plates W is not intended), W5 is simply cut.
Further, as shown in FIG. 2 (a), the center of the Lauan stem LD is rotated so as to be an axis, and a blade CT having a predetermined width is applied to the outer peripheral side thereof, so that the continuous thin plate ULD is peeled by the same peeling as the wig. Is formed. That is, the lauan stem LD is formed by cutting out a continuous thin plate, ie, a continuous thin plate ULD, with a predetermined thickness like radish wig peeling. The continuous thin plate ULD is cut to a predetermined length and dried to produce a Lauan thin plate L having a predetermined area and a predetermined thickness. In order to form the multilayer material NW before pressurization, the Lauan thin plate L is disposed at the corresponding position.

The Lawan thin plate L1 and the oil palm thin plates W2,..., W5 in this embodiment are arranged such that the Lauan thin plate L is disposed on the exposed surface. The exposed surface can be the Lauan thin plate L. On the other hand, the material of the layer that is not exposed, for example, one, two, or three of the oil palm thin plates W2, W3, and W4 can be the Lauan thin plate L. In place of the lauan thin plate L, a Chinese thin plate or a coniferous thin plate can be used.
In particular, it is preferable to use the thin China plate for the design surface. For softwood thin plates, one to three pieces are bonded with other adhesives, such as urea resin, epoxy resin, or non-formaldehyde adhesive, and the oil palm thin plate W is bonded to both surfaces. Strength can be increased. Even when Lauan thin plate L, China thin plate, or softwood thin plate is used, the length direction of the fibers is basically an array of thin plates perpendicular to each other, and the use is determined as a multilayer plywood PW for bending. For example, the entire fiber (vascular bundle) direction can be made the same, or one or two of the multilayer thin plates can have different fiber directions.

Next, in the first embodiment, a total of five sheets of a lauan thin plate L1 having a predetermined area and a predetermined thickness and four oil palm thin plates W2,. An example of NW will be described. In addition, when implementing this invention, the number of the lauan thin board L1 and the oil palm thin board W is not limited.
As shown in FIG. 3, the pre-pressing multilayer material NW is similar to the lauan thin plate L1 having a short side in the supply direction of the continuous thin plate ULD that has been peeled off the lauan stem LD described with reference to FIG. 2B, oil palm thin plates W3 and W5 having short sides in the supply direction of the continuous thin plate UWD from which the oil palm trunk WD has been peeled off, and the supply of the continuous thin plate UWD shown in FIG. 2C. The thin plates W2 and W4 having long sides in the direction are stacked.
The five lauan thin plates L1 and the oil palm thin plates W2,..., W5 having a predetermined area and a predetermined thickness may be formed by cutting, or may be formed by cutting a fine tooth saw. Any of the properties of oil palm may be used, but cutting is more efficient from the viewpoint of workability.

In the present embodiment, two types of oil palm thin plates W3 and W5 with short sides in the supply direction of the continuous thin plate UWD from which the oil palm trunk WD has been peeled and thin plates W2 and W4 with long sides in the supply direction of the continuous thin plate UWD are provided. However, it may be set so that four oil palm thin plates W2,..., W5 can be obtained with the width in the supply direction of the continuous thin plate UWD. In any case, as shown in FIG. 3, the lauan thin plate L1 and the oil palm thin plates W3 and W5 with short sides in the supply direction of the continuous thin plate UWD, and the oil palm thin plates W2 and W4 with long sides in the supply direction of the continuous thin plate UWD are provided. What is necessary is just to load the multilayer material NW before pressurization so that the length direction of each fiber becomes a right angle.
Of course, the lavan thin plate L1, oil palm thin plates W3, W5 with short sides in the supply direction of the continuous thin plate UWD and the oil palm thin plates W2, W4 with long sides in the supply direction of the continuous thin plate UWD shown in FIG. Are stacked in such a way that two lauan thin plates L1 and two oil palm thin plates W3 and W5 are short in the supply direction of the continuous thin plate UWD, and two oil palm thin plates WW2 and W4 are long in the supply direction of the continuous thin plate UWD. Can also be a combination of three.

Five lauan thin plates L1 and oil palm thin plates W2,..., W5 having a predetermined area and thickness are cut and aligned with the stacked state of the multilayer material NW before pressurization as shown in FIG. In this case, it is necessary to dry the hot air having a low humidity by applying it to both sides of the lauan thin plate L1 and the oil palm thin plates W2,. The lauan thin plate L1 and the oil palm thin plate W2,..., W5 as the multilayer material NW before pressurization are sent to the production line where five sheets of lauan thin plate L1 and oil palm thin plate W2,. , W5 is dried, and can be laminated as a pre-pressurized multilayer material NW as shown in FIG. When performing this lamination, in order to prevent the lauan thin plate L1 and the oil palm thin plate W from spreading in the surface direction, a frame body for positioning each side of the five lauan thin plates L1 and the oil palm thin plates W2,. It is desirable to set 20 (see FIG. 7) or positioning hole 18 (see FIG. 5). For the sake of simplicity, FIGS. 5 and 6 will be described with reference to the case of the positioning hole 18.
Thus, the process of laminating a plurality of lauan thin plates L and oil palm thin plates W in the predetermined state is called a laminating step.

Therefore, the laminated plywood PW is compressed as a multilayer material NW before pressurization by applying a predetermined compression force under a predetermined temperature condition, and after a predetermined time has elapsed, the temperature is set to a predetermined level. After depressurizing to temperature and fixing, it is decompressed.
That is, a compression step of applying a compressive force in a direction perpendicular to the surfaces of the lauan thin plate L and the oil palm thin plate W to the laminated lauan thin plate L1 and oil palm thin plates W2, ..., W5 heated by the heating step. After pressing for a predetermined time at a predetermined temperature in the compression step, the temperature supplied in the heating step is lowered, and through a fixing step for maintaining the compressed state, a consolidated laminated plywood PW is obtained. is there.
Here, the step of heating to raise the temperature of the laminated lauan thin plate L and oil palm thin plate W after the laminating step is called a heating step, and the lauan thin plate L heated and laminated by the heating step The step of applying a compressive force in the direction perpendicular to the surfaces of the Lauan thin plate L and the oil palm thin plate W to the oil palm thin plate W is referred to as a compression step. Then, after pressing for a predetermined time in the compression step, the temperature supplied in the heating step is lowered, and the step of cooling and fixing at normal temperature or slightly lower than that is fixed in a consolidated state. In this sense, it is called an immobilization process.

First, the procedure for manufacturing the laminated plastic processed wood according to the embodiment of the present invention will be described with reference to FIGS.
As shown in the flowchart of FIG. 8, first, a predetermined length of the oil palm trunk WD is peeled to a predetermined thickness with a rotary race blade CT while being rotated in the circumferential direction to form a plurality of oil palm thin plates W. In the thin plate process of step S10, the oil palm thin plate W having a material thickness in the range of 3 mm to 35 mm is peeled from the oil palm trunk WD, and then in the drying process of step S20, the moisture content is in the range of 10% to 30% The dried oil palm sheet W is dried.

  Similarly, as shown in FIG. 2 (a), a lauan stem LD composed of a predetermined length of lauan material is rotated in the circumferential direction while being peeled off to a predetermined thickness with a rotary lace cutter CT. In the thin plate process of step S11 to be formed on the thin plate L, the lauan thin plate L having a material thickness within the range of 10 mm to 25 mm is peeled from the lauan stem LD, and then in the drying step of step S21, the moisture content is 5% to 30%. The lauan thin plate L is dried within the range and dried.

  Here, the drying method of the oil palm thin plate W and the Lauan thin plate L in the drying step includes artificial drying or natural drying (sun drying). As the artificial drying, for example, hot air is removed from the oil palm thin plate W using a dryer such as a steam dryer having a high-temperature steam as a heat source and a built-in dehumidifier including a refrigerator for removing humidity. Oil palm thin plate W, external heating method that heats from the outside of lauan thin plate L by spraying on lauan thin plate L or heating and squeezing with press machine, oil palm thin plate W, lauan thin plate L is subjected to dielectric heating and inside However, as is well known, natural drying is generally less expensive than artificial drying, as is well known.

However, when the oil palm thin plate W and the Lauan thin plate L are naturally dried, especially when the oil palm thin plate W is thick, bacteria such as mold are prone to grow and corrode, and productivity and commercial value are impaired. This is because wood such as lauan thin plate L, which is generally used for building materials, forms a secondary xylem composed of cell (dead cell) tissue in which the movement of water and nutrients has stopped. This is because the oil palm stem WD is composed only of primary tissues of vascular bundles and parenchymal cells, and most cells centering on parenchymal cells are living cells to which water and nutrients are transferred, and the moisture content is extremely high. Furthermore, it was found that oil palm trunk WD (oil palm trunk) is rich in saccharides (eg, fructose, glucose, fructooligosaccharides, inositol, etc.). When the thickness of the oil palm thin plate W obtained from the trunk of the palm is thick, bacteria such as mold are proliferated and corroded by natural drying, and productivity and commercial value are impaired.
Therefore, according to the experiments by the present inventors, by reducing the thickness of the oil palm thin plate W obtained from the oil palm trunk WD to a range of 20 mm or less, the product value and productivity are reduced by bacteria such as mold even in natural drying. It has been confirmed that the cost can be reduced without incurring cost. In addition, this thickness is equivalent to the thickness of 3.5 mm-7.0 mm after a compaction process, when a compression rate is 65%. Further, when the compression ratio is 70%, the thickness corresponds to 3.0 mm to 6.0 mm after the consolidation.

Furthermore, according to experiments by the present inventors, when the thickness of the oil palm thin plate W obtained from the oil palm trunk WD is less than 3 mm (when it is less than 0.9 to 1.1 after consolidation), the thickness Since it is thin, it is easy to cut when it is peeled off, and when it exceeds 20 mm, it is difficult to uniformly dry to the inside, so deformation and bulge are likely to occur after compaction processing, which will be described later, and the curved surface is re-arranged It has also been confirmed that cracks are likely to occur.
For this reason, the oil palm thin plate W having a thickness of 3 mm or more and 20 mm or less is peeled off from the oil palm trunk WD, and it can be dried at low cost without causing deterioration in commercial value and productivity due to bacteria such as mold. Further, the cutting operation is easy, and the dimensional shape stability after the compacting process described later is high.
In addition, Preferably, the thickness of the oil palm thin plate W from the oil palm trunk WD is in the range of 6 mm or more and 15 mm or less. This thickness corresponds to a thickness of 2.1 mm or more and 5.3 mm or less after the compacting when the compression ratio is 65%. If the compression ratio is 70%, the thickness corresponds to 1.8 mm to 4.5 mm after the consolidation.

  In addition, drying within the range of 5% to 30% of moisture content means that, as a result of repeated experiments by the inventors, when the moisture content of the dried oil palm thin plate W and lauan thin plate L is less than 5%, A phenomenon in which a sufficient chemical change cannot be caused by the compacting process described later, and the surface is too dry and the compressed part returns to the original thickness when wetted after compacting, so-called so-called phenomenon Improper immobilization tends to occur. On the other hand, when the moisture content exceeds 30%, it is difficult to uniformly dry to the inside, and after consolidation, damage such as cracking, rupture, deformation, swelling, etc. are likely to occur. This is the setting based on this. That is, it is desirable that the oil palm thin plate W and the Lauan thin plate L have a substantially uniform moisture content over the entire thickness, and the entire thickness is desirably plastically processed with a substantially uniform compression rate. A range of 30% is preferable. More preferably, the water content is in the range of 13% to 18%. In addition, a moisture content is measured using measuring instruments, such as a high frequency moisture content meter, for example.

Next, the lamination process of step S30 which laminates a plurality of dried oil palm thin plates W is performed. That is, it is a step of laminating a plurality of oil palm thin plates W and lauan thin plates L that are dried in the drying step of step S20 and step S21 in a predetermined state. The pre-pressurized multilayer material NW is obtained by the stacking process of step S30. The multi-layered material NW before pressurization has the same outer shape, but the oil palm thin plate W and the lauan thin plate L in any stacking direction are merely overlapped by their own weight.
Here, a compacted wood manufacturing apparatus MC that performs compaction of the pre-pressurized multilayer material NW formed by laminating the oil palm thin plate W and the Lauan thin plate L will be described with reference to FIG.

  In FIG. 5, the compacted material manufacturing apparatus MC for manufacturing the laminated plywood PW of the present embodiment mainly includes an internal space IS and positioning holes 18 by a structure divided into two parts, an upper press board 10A and a lower press board 10B. Are arranged on the peripheral portion 10a of the upper press plate 10A facing the peripheral portion 10b of the lower press plate 10B, and the position of the multilayer material NW before pressurization is determined and regulated on the lower press plate 10B. A positioning member 18 is formed, and the seal member 11 that seals the internal space IS and the positioning hole 18 within a predetermined range of vertical movement of the upper press board 10A, and the internal space IS and the positioning hole from the upper surface side of the upper press board 10A. 18, a pipe 12 having a pipe port 12 a for supplying steam into the internal space IS and the positioning hole 18, an upstream valve V 4, and a lower press machine The pipe 13 is connected to the internal space IS and the positioning hole 18 from the side surface of 0B, and has a pipe port 13a for discharging water vapor from the internal space IS and the positioning hole 18, and the vapor pressure in the pipe 13 is detected. It consists of a pressure gauge P2, a downstream valve V5, a drain pipe 14 connected to the valve V5, and the like.

  The press board 10 has a plane size that can place the entire specific surface perpendicular to the surface of the multilayer material NW before pressurization, that is, the entire surface to be compressed of the multilayer material NW before pressurization. The material is not particularly limited. For example, it is formed of a material such as stainless steel or aluminum so that the wood is not blackened due to iron ion contamination, or the contact surface with the multilayer material NW before pressurization is plated. Is given. Furthermore, the material of the seal member 11 that seals the internal space IS and the positioning hole 18 is not particularly limited, but usually, silicon rubber, silicon resin, etc. excellent in heat resistance and water resistance are used. .

  Further, in the upper press board 10A and the lower press board 10B of the press board 10, pipe lines 15 and 16 are formed for raising the temperature to a desired temperature by passing high-temperature steam. Pipes ST2 and ST3 branched from the steam supply side pipe ST1 and steam discharge side pipes ET1 and ET2 are connected to the paths 15 and 16, respectively. Further, in the middle of the steam supply side pipes ST1, ST2, ST3, valves V1, V2, V3 and a pressure gauge P1 for detecting the steam pressure in the pipe ST1 are arranged, and the steam discharge side pipes ET1, ET2 Is connected to the drain pipe 14 via a valve V6.

In addition, the boiler apparatus which supplies water vapor | steam to piping ST1, and the press raising / lowering apparatus containing the hydraulic mechanism for raising / lowering and pressurizing the upper press board 10A with respect to the lower press board 10B of the fixed side of the press board 10 are abbreviate | omitted. Has been.
In the first embodiment, the internal space IS formed by the upper press board 10A and the lower press board 10B of the press board 10 and the piping 12 connected to the valve V4 for heating the inside of the positioning hole 18 are used. Although water vapor is introduced, it is also possible to use high-frequency heating, microwave heating, or the like. In particular, for the high-frequency heating of wood, a method of heating from the center of wood at a high frequency slightly lower than that of microwave is preferable to dielectric overheating by microwave.

Further, on the press board 10, a cooling water supply side that cools to a desired temperature by passing low-temperature cooling water in place of water vapor through the pipes 15 and 16 formed in the upper press board 10A and the lower press board 10B. Pipes ST12 and ST13 branched from the pipe ST11 are connected to the pipes ST2 and ST3, respectively. Further, valves V11, V12, V13 are arranged in the middle of the pipes ST11, ST12, ST13 on the cooling water supply side. In addition, the cooling water supply apparatus which supplies cooling water to piping ST11 is abbreviate | omitted.
Of course, when the present invention is carried out, the direction of press compression by the press board 10 is compressed in a direction perpendicular to the surfaces of the five oil palm thin plates W and the lauan thin plate L of the multilayer material NW before pressurization. Power is applied.

When the laminated plywood PW is manufactured from the pre-pressing multilayer material NW by the compacted material manufacturing apparatus MC configured as described above, first, as shown in FIG. 6A, a press in the compacted material manufacturing apparatus MC The upper press board 10A rises with respect to the lower press board 10B on the fixed side of the board 10, and a pre-pressing multilayer material NW that has been dried in advance to a predetermined condition is formed by the upper press board 10A and the lower press board 10B. It is placed in the internal space IS and the positioning hole 18.
Here, in the present embodiment, the pre-pressing multilayer material NW that is a raw material of the laminated plywood PW is formed in a predetermined dimension (thickness, width, length), and a total of five oil palms The surface side of the thin plate W and the lauan thin plate L was opposed to the upper press plate 10A and the lower press plate 10B of the press plate 10 and placed in the positioning hole 18 of the lower press plate 10B.

Subsequently, as shown in FIG. 6B, the upper press platen 10A is lowered at a predetermined pressure with respect to the pre-pressing multilayer material NW placed on the positioning hole 18 of the fixed-side lower press platen 10B. In this embodiment, the upper surface of the pre-pressurized multilayer material NW, that is, the surface of the Lauan thin plate L1 and the oil palm thin plates W2,. In step S40, timer control by the timer I is started. Looking at the timer I in step S40, it is determined whether it is the heating timing in step S41, and it is determined whether it is the compression timing in step S42.
At the heating timing, water vapor of a predetermined temperature (for example, 110 to 180 [° C.]) is passed through the piping path 15 of the upper press panel 10A and the piping path 16 of the lower press panel 10B in step S43, and the internal space IS and the positioning hole 18 is maintained at a predetermined temperature (for example, 110 to 180 [° C.]). If it is determined in step S41 that it is not the heating timing, it is determined in step S42 whether it is the compression timing. If it is the compression timing, the compression process is entered in step S44.

That is, in step S44, the compression force of the upper press board 10A is set to a predetermined pressure (for example, 20 to 50 kg / cm ² ) with respect to the lower press board 10B on the fixed side, and the multilayer material NW before pressurization is the upper press board. 10A and the lower press panel 10B are heated and compressed for a predetermined time (for example, 5 to 40 [min]). Also, in step S45, it is determined whether the heating / compression is completed, and the routine processing from step S40 to step S45 is performed until the end time is reached.
In order to prevent cracking, the compressive force in step S44 is the temperature rise of the multilayer material NW before pressurization, that is, the internal temperature state of the multilayer material NW before pressurization according to the elapsed time of the timer I in step S45, heating It is desirable to gradually increase with the passage of time, and it is preferable to set the heating and compression time in consideration of the heating time.

  Furthermore, as shown in FIG. 6 (c), when the peripheral edge portion 10a of the upper press board 10A comes into contact with the peripheral edge part 10b of the lower press board 10B, the seal member 11 disposed on the peripheral edge part 10a of the upper press board 10A. The internal space IS and the positioning hole 18 formed by the upper press board 10A and the lower press board 10B are hermetically sealed. Here, steam is supplied into the internal space IS and the positioning hole 18 through the pipe port 12 a of the pipe 12. At this time, the water vapor simultaneously wets the oil palm base material W or the pre-pressurized multilayer material NW in a dry state to a predetermined humidity with a good balance. Then, with the internal space IS and the positioning hole 18 sealed, the compression force by the upper press board 10A and the lower press board 10B is maintained, and a predetermined temperature (for example, 150 to 210 [° C.]) based on the timer I in step S40. ).

  In the first embodiment, the internal space IS when the internal space IS and the positioning hole 18 formed by the upper press board 10A and the lower press board 10B of the press board 10 are in a sealed state via the seal member 11. The dimension interval in the vertical direction of the positioning holes 18 is set to the finished dimension in the thickness direction when the pre-pressing multilayer material NW becomes the laminated plywood PW having a compression rate of 70% by the press board 10. For this reason, the compression ratio of the entire thickness of the multilayer material NW before pressurization, that is, the change in the plate thickness due to the compression of the multilayer material NW before pressurization, is that the peripheral portion 10a of the upper press panel 10A is the peripheral part 10b of the lower press panel 10B. It will be decided by contacting.

Then, in the sealed state of the internal space IS and the positioning hole 18 shown in FIG. 6C, the compressive force of the upper press board 10A and the lower press board 10B is maintained, and the internal space IS and the positioning hole 18 are kept at a predetermined temperature ( For example, heating for forming a laminated plywood PW that is maintained for a predetermined time (for example, 30 to 120 [min]) with 150 to 210 [° C.] and does not return when the subsequent cooling and compression is released. Processing is performed. At this time, high-temperature and high-pressure vapor pressure is generated between the surrounding surface of the pre-pressurized multilayer material NW and the inside thereof through the internal space IS and the positioning hole 18 which are sealed by the upper press board 10A and the lower press board 10B. You can go in and out.
As described above, in the present embodiment, the upper press board 10A and the lower press board 10B are in surface contact with the front and back surfaces of the pre-pressurized multilayer material NW and are held in the sealed internal space IS and the positioning holes 18. Therefore, the multilayer material NW before pressurization is sufficiently heated in its entire thickness, and is efficiently compressed and deformed.

Next, as shown in FIG. 6D, when the heat compression process is performed in a sealed state of the internal space IS and the positioning hole 18, the internal space IS and the positioning hole are detected by the pressure gauge P2 as a vapor pressure control process. 18 vapor pressure is detected, and the valve V5 is appropriately opened and closed. Thereby, high-temperature and high-pressure water vapor is discharged from the internal space IS and the positioning hole 18 to the drain pipe 14 side through the pipe port 13a and the pipe 13, and in particular, the moisture content of the outer layer portion of the multilayer material NW before pressurization. Therefore, the excess internal space IS and moisture in the positioning hole 18 are removed, and the internal space IS and the positioning hole 18 are adjusted to have a predetermined vapor pressure. Further, if necessary, a predetermined vapor pressure can be supplied to the internal space IS through the pipe 12 and the pipe port 12a (FIG. 5) connected to the valve V4. As a result, the fixing of the heat compression treatment of the wood, that is, the so-called immobilization of the wood is further promoted.
Further, immediately before the transition from the heating compression to the cooling compression by the upper press panel 10A and the lower press panel 10B, the valve V5 is opened as a vapor pressure control process, so that the internal space passes through the piping port 13a and the piping 13. High-temperature and high-pressure steam is discharged from the IS and positioning hole 18 to the drain pipe 14 side.

If it is determined in step S45 that the heating process in step S43 and the compression process in step S44 based on the operation of the timer I in step S40 have been completed, the fixing process is started in step S60. In the immobilization process, normal temperature cooling water or ground water is passed through the piping path 15 of the upper press panel 10A and the piping path 16 of the lower press panel 10B based on the timer II of step S65, as shown in FIG. As a result, the upper press board 10A and the lower press board 10B are cooled to around room temperature and held for a predetermined time (for example, 10 to 120 [min] for oil palm) depending on the material. At this time, the compression force of the upper press disk 10A with respect to the fixed-side lower press disk 10B is maintained at a predetermined pressure (for example, 20 to 50 kg / cm ² ) that is the same as the pressure at the time of heat compression. The board 10A and the lower press board 10B are cooled.
Finally, as shown in FIG. 6 (f), a pressure releasing process is entered in step S70, and the upper press platen 10A is lifted with respect to the fixed-side lower press platen 10B. A series of processing steps is completed when the finished laminated plywood PW is taken out.

  The compacted material manufacturing apparatus MC that manufactures the laminated plywood PW of the present embodiment mainly forms an internal space IS and a positioning hole 18 by a two-divided structure of an upper press board 10A and a lower press board 10B. Although the board 10 is provided, the movement restriction of the outer periphery of the pre-pressurized multilayer material NW when the present invention is carried out can be the frame body 20. The frame 20 as the movement restriction of the outer periphery of the pre-pressurized multilayer material NW is determined as a structure that can move up and down or a fixed structure depending on the dimensions of the upper press panel 10A.

Here, the oil palm thin plate W and the lauan thin plate L to be laminated may be laminated with the same fiber direction, or may be laminated with their fiber directions orthogonal to each other.
When laminated with the same fiber direction, the wood fibers softened in the consolidation process are easily entangled with the other wood surface layer fibers of the same fiber direction adjacent to the lamination direction (longitudinal direction), The wood fixed in the intertwined state is firmly joined. In addition, since the expansion rate and contraction rate of the joint surface can be made completely equal, no stress is applied to the joint surface even if the ambient environment conditions change. Therefore, the bonding strength is high and the mechanical strength is high, and a stable dimensional shape after consolidation is ensured.

On the other hand, when laminated with the fiber directions orthogonal to each other, even if expansion and contraction force occurs due to changes in the surrounding environmental conditions after consolidation, the woods interact with each other to prevent warping deformation in a specific direction Is done.
In particular, when the total number of sheets is an odd number, when laminated with the fiber directions orthogonal to each other, the fiber direction of the single plate is parallel and the cross section is symmetric on the front and back, so distortion due to changes in ambient environmental conditions is prevented. The In addition, when the total number of sheets is an even number of four or more, the fiber directions on the front and back sides are laminated by laminating the fiber directions at the same part in the inside and laminating the other with the fiber directions orthogonal to each other. It is possible to prevent distortion and the like due to changes in the ambient environmental conditions.

  In addition, in the oil palm thin plate W and the lauan thin plate L to be laminated, the bark side surfaces are the surfaces cut parallel to the fibers and the bark side surfaces, or the bark side surfaces are cut parallel to the fibers. Are preferably laminated. The warp deformation in a specific direction due to the difference in cell density between the bark side surface and the bark side surface can be prevented by causing the bark side surfaces of each other or the bark side surfaces of each other to face each other and being joined by consolidation.

  Furthermore, among the dried laminated plywood PW, it is preferable that materials having a small air-drying specific gravity after drying are arranged on the front and back and laminated. As a result, wood having a small air-drying specific gravity after drying is disposed on the front and back layers in contact with the upper press platen 10A and the lower press platen 10B, and compaction processing is performed. Therefore, the air-drying specific gravity after drying is small. The wood is sufficiently heated and compressed by the upper press board 10A and the lower press board 10B to reduce the difference in specific gravity between the woods, and the difference in the rate of dimensional change after production. Therefore, the stability of the dimensional shape after commercialization increases.

Next, as shown in FIG. 5, the upper press plate 10 </ b> A is subjected to a predetermined pressure (for example, 0.5 to 0.5) with respect to the plurality of stacked multi-layered pre-pressing materials NW placed on the lower press plate 10 </ b> B on the fixed side. 3 kg / cm ² ) and is brought into contact with the upper surface of the laminated pre-pressing multilayer material NW, that is, a plane perpendicular to the fiber length direction.
Then, at the beginning of the consolidation process, first, heating in the heating process (step 43) is started, and the valve V1, valve V2, and valve V3 (FIG. 2) are opened, and a pipe line 15 of the upper press panel 10A from a boiler device (not shown). And the water vapor for heating is passed through the pipe line 16 of the lower press panel 10B, the interior space IS and the positioning hole 18 are maintained at a predetermined heating temperature, and the laminated multilayer material NW before pressurization is heated.

  Here, it is preferable that the heating temperature in the heating process in the initial stage of compression is in the range of 110 ° C to 160 ° C. If the heating temperature is too low, sufficient compacting will not be achieved, resulting in insufficient strength, poor bonding between wood, and dimensional shape deformation due to hygroscopic drying after product production, while the heating temperature is too high. The surface may be carbonized to change to black and the color tone or scent peculiar to wood may be impaired, or the material may deteriorate and the strength may be lowered and become brittle. According to the experiments by the present inventors, it has been found that an appropriate temperature condition is in the range of 110 ° C to 160 ° C. By using this temperature condition, it is possible to prevent improper fixing in the compacting process, and material deterioration such as surface carbonization and lowering of material strength. More preferably, the heating temperature in the heating step in the initial stage of compression is in the range of 120 ° C to 140 ° C. The specific set temperature is set according to the moisture content of the oil palm thin plate W and the lauan thin plate L, and the like.

Subsequently, in the pressurizing step of step S44, the compression pressure of the upper press panel 10A is set to a predetermined pressure with respect to the lower press panel 10B on the fixed side, and the multilayer material NW before press is applied to the upper press panel 10A and the lower press. The panel 10B is heated and compressed for a predetermined time. At this time, as shown in FIG. 6C, when the peripheral portion 10a of the upper press panel 10A comes into contact with the peripheral portion 10b of the lower press panel 10B, the seal member 11 disposed on the peripheral portion 10a of the upper press panel 10A. As a result, the internal space IS and the positioning hole 18 formed by the upper press board 10A and the lower press board 10B are sealed.
Thus, by heating and compressing by surface contact of the press panel, in particular, by applying pressure after heating to the heating temperature, even when warp deformation during drying occurs in the multilayer material NW before pressurization, Flattening can be achieved without causing cracks, cracks, etc., and heat compression can be performed efficiently. Furthermore, while the multilayer material NW before pressurization is heated and compressed and the internal space IS and the positioning hole 18 are kept in a sealed state, the water vapor originally contained in the multilayer material NW before pressurization becomes the vapor pressure. Thus, the dried wood DW can be freely diffused and discharged through the internal space IS and the positioning hole 18, so that the entire thickness is efficiently and uniformly heated and compressed.

Here, it is preferable that the predetermined pressure which compresses the multilayer material NW before pressurization exists in the range of 1-100 kg / cm < ² >. If the pressure is too low, immobilization will be poor in the compacting process, while if the pressure is too high, cracks may occur on the surface. According to the experiments of the present inventors, an appropriate pressure conditions is within the 1 to 100 kg / cm ^2. By adopting this pressurizing condition, it is possible to prevent immobilization defects and occurrence of cracks in consolidation. More preferably, it is in the range of 10 to 50 kg / cm ² .
In addition, when the compression speed at this time is high, water vapor and air in the multilayer material NW before pressurization are difficult to escape, and the pressure acting on the multilayer material NW before pressurization increases, so that cracks occur, There is a risk of internal cracking due to insufficient softening of wood. On the other hand, when the compression speed is low, the load on the surface in contact with the upper press board 10A and the lower press board 10B is increased, and cracks or the like may occur. Therefore, it is desirable that the compression pressure at this time be gradually increased according to the temperature transmission state inside the pre-pressurized multilayer material NW.

  Furthermore, according to the experiments by the present inventors, it is preferable that the time for heating and compressing be in the range of 10 minutes to 40 minutes. This time condition can prevent subsequent immobilization due to the treatment time being too short and carbonization of the surface due to the treatment time being too long. More preferably, the predetermined time during compression is in the range of 20 minutes to 30 minutes. In addition, it is preferable to set also the time of this heat compression considering the transmission state (time) of the temperature inside the multilayer material NW before pressurization.

  Note that the internal space IS and the positioning hole 18 formed by the upper press board 10A and the lower press board 10B of the press board 10 are hermetically sealed via the seal member 11, and the vertical direction of the internal space IS and the positioning hole 18 is as follows. The dimension interval is set to the finished dimension in the thickness direction when the plurality of laminated multi-layered pre-pressurized materials NW are consolidated into a laminated plywood PW having an air-dry specific gravity of 0.8 or more. For this reason, the compression ratio of the entire thickness of the laminated multilayer material NW before pressurization, that is, the change in the plate thickness due to the compression of the plurality of laminated multilayer materials NW before pressurization is the peripheral portion 10a of the upper press panel 10A. Is determined by contacting the peripheral edge portion 10b of the lower press panel 10B.

Next, the predetermined compression pressure (preferably within the range of 1 to 100 kg / cm ² ) by the upper press board 10A and the lower press board 10B is maintained in the sealed state of the internal space IS and the positioning hole 18 shown in FIG. As it is, the temperature is raised to a specific heating temperature by the piping 15 of the upper press panel 10A and the piping 16 of the lower pressing panel 10B, and the internal space IS and the positioning hole 18 are maintained at the predetermined heating temperature for a predetermined time. The At this time, a high-temperature and high-pressure vapor pressure is generated between the surrounding surface of the pre-pressurized multilayer material NW and the inside thereof through the internal space IS and the positioning hole 18 which are sealed by the upper press platen 11 and the lower press platen 21. You can go in and out.
When the heat compression process is performed in a sealed state of the internal space IS and the positioning hole 18, the vapor pressure control process detects the vapor pressure of the internal space IS and the positioning hole 18 with the pressure gauge P2. As shown in (d), the vapor pressure of the second heating temperature is supplied to the internal space IS through the pipe 12 and the pipe port 12a connected to the valve V4, or the valve V5 is appropriately opened and closed. Then, high-temperature and high-pressure water vapor is discharged from the internal space IS to the drain pipe 14 side through the pipe port 13a and the pipe 13, whereby the vapor pressure of the internal space IS and the positioning hole 18 is controlled to a predetermined value.

  Thus, the wood is heated and compressed by controlling the vapor pressure of the internal space IS and the positioning hole 18. That is, the entire surface of the multilayer NW before pressurization is made uniform with the same temperature, pressure, and vapor pressure as the interior space IS and the positioning hole 18 in the peripheral surface of the wood and the interior thereof, so that processing distortion does not occur and molding is performed. The contraction and expansion due to the subsequent restoring force and changes in ambient environmental conditions are significantly suppressed. In particular, by controlling the vapor pressure by discharging or introducing water vapor while maintaining a predetermined pressure state, the surface is prevented from being carbonized, uniformly heated and compressed, and further, the surface is prevented from drying. Smooth fixation is achieved, and recovery, return, deformation, etc. after molding are suppressed.

  Here, it is preferable that the final heating temperature for maintaining the heating and compression state for compaction is in the range of 120 ° C to 210 ° C. If the heating temperature is too low, the immobilization becomes sweet and chemical changes due to the action of water vapor cannot be caused sufficiently, resulting in improper immobilization, which tends to occur due to moisture absorption or deformation due to drying, while the heating temperature is high. If it is too much, the surface may be carbonized to change to black, and the color tone or scent peculiar to wood may be impaired, or the material may deteriorate and the strength may be lowered and become brittle. According to our experiments, suitable temperature conditions are in the range of 120 ° C to 210 ° C. By setting this temperature condition, it is possible to prevent immobilization failure in the compacting process, maintain dimensional shape stability, and prevent material deterioration such as surface carbonization and material strength reduction. More preferably, the heating temperature is in the range of 120 ° C to 140 ° C.

  Further, according to the experimental study by the present inventors, the compression time immediately before immobilization is preferably in the range of 10 minutes to 120 minutes. By this time condition, it is possible to prevent immobilization failure due to the treatment time being too short and carbonization of the surface due to the treatment time being too long. More preferably, the predetermined time is in the range of 30 minutes to 90 minutes. The specific set time for performing the heating / compression process immediately before the immobilization is set in consideration of the moisture content of the multilayer material NW before pressurization.

Incidentally, the start of the vapor pressure control in the internal space IS and the positioning hole 18 in the sealed state due to the introduction or discharge of water vapor is performed after the temperature of the upper press panel 10A and the lower press panel 10B reaches a specific heating temperature. It is desirable to be done. If it does in this way, water vapor can osmose | permeate in the multilayer material NW before pressurization, and, thereby, the chemical change of the oil palm thin plate W and the lauan thin plate L can fully be caused, As a result, oil palm thin plate W, lauan thin plate L can be fixed sufficiently and uniformly, and the return due to moisture absorption, the deformation due to drying, and the like are small. That is, when the introduction of water vapor in the closed internal space IS and the positioning hole 18 is started before the temperatures of the upper press board 10A and the lower press board 10B reach a specific heating temperature, the water vapor is condensed. The interior space IS and the positioning hole 18 in the sealed state are filled with water, and the moisture content of the wood increases, and as a result, return due to moisture absorption, deformation due to drying, and the like are likely to occur. Further, even when the discharge of water vapor in the internal space IS and the positioning hole 18 in the sealed state is started before the temperatures of the upper press board 10A and the lower press board 10B reach the second heating temperature, the water content of the outer layer portion is also increased. The excess internal space IS based on the rate and the moisture in the positioning hole 18 are difficult to be removed, and the moisture content of the wood increases, so that return due to moisture absorption, deformation due to drying, and the like are likely to occur.
In addition, it is preferable to end the vapor pressure control before starting the cooling described later. If the vapor pressure control is not finished before starting the cooling described later, the cooling processing efficiency is lowered.

  Further, when steam is introduced into the internal space IS and the positioning hole 18 in a sealed state to control the vapor pressure, the temperature of the upper press panel 10A and the lower press panel 10B reaches a specific heating temperature. It is preferable to introduce a water vapor pressure and temperature equal to or lower than the water vapor pressure and temperature in the internal space IS and the positioning hole 18. When the pressure and temperature of the introduced water vapor are higher than the water pressure and temperature in the internal space IS and the positioning hole 18, the water is condensed and the internal space IS and the positioning hole 18 in a sealed state are filled with water. As a result, the moisture content of the oil palm thin plate W and the lauan thin plate L increases, and as a result, return due to moisture absorption, deformation due to drying, and the like are likely to occur. In addition, in the internal space IS and the positioning hole 18 in a sealed state, when excess moisture based on the moisture content of the outer layer portion of the multilayer material NW before pressurization exists, the high temperature in the internal space IS and the positioning hole 18 By appropriately discharging high-pressure water vapor, the pressure is adjusted to a predetermined vapor pressure.

Subsequently, the immobilization process in step S60 is performed while the pressure is maintained at the same predetermined pressure (preferably within the range of 1 to 100 kg / cm ² ) as the pressure in the heating process in step S43 and the compression process in step S44. V11, the valve V12, and the valve V13 (FIG. 5) are opened, and normal temperature cooling water is passed from the boiler device (not shown) through the piping path 15 of the upper press panel 10A and the piping path 16 of the lower press panel 10B. As shown in (e), the upper press board 10A and the lower press board 10B are cooled to around room temperature and held for a predetermined time (for example, 10 to 120 [min]).
Finally, the pressure is released in the fixing step of step S60, and as shown in FIG. 6 (f), the upper press disk 10A is gradually raised and separated from the fixed lower press disk 10B. The pressure and the sealed state are released, and the laminated plywood PW as a finished product is taken out from the internal space IS and the positioning hole 18 to complete a series of processing steps.

  Thus, the fixing in the compacted state is stabilized by cooling under the pressure state in which no deformation occurs. And after cooling in a pressurized state, by releasing the pressurization, that is, by lowering the water vapor pressure in the multilayer material NW before pressurization by cooling, gradually releasing the pressure to release the internal vapor pressure Thus, the laminated plywood PW can be liquefied and removed when the cooling compression is released, and there is no bulging deformation, cracking, puncture or the like. That is, according to the laminated plywood PW of the present embodiment, stable quality is ensured without causing bulging deformation, cracking, destruction, etc. after compression release.

  In this way, the entire thickness of the laminated multilayer material NW before pressurization is heated and compressed by an external force applied in a direction perpendicular to the length direction of the fibers of the laminated multilayer material NW before pressurization. A laminated plywood PW having a dry specific gravity of 0.8 or more is manufactured. And the laminated plywood PW obtained in this way is firmly joined to each other by consolidation. This is because cellulose, hemicellulose, and lignin are hydrogen-bonded by compaction processing, and especially the palm of an oil palm contains many sugars, lignin, plastic components, etc., and these components are decomposed and softened by compaction processing. It functions as a binder by being recrystallized and recombined after moving between woods, and further, the wood in the surface layer of the oil palm thin plate W is softened by the consolidation process, and the wood is adjacent in the stacking direction. It is considered that the woods are firmly joined by being intertwined with the fibers.

As described above, according to the laminated plywood PW according to the present embodiment, wood is bonded without using an artificial adhesive or environmental adhesive due to formaldehyde or the like, and a natural adhesive having a high cost. It is gentle and can reduce costs.
In addition, when the oil palm thin plate W and the lauan thin plate L are joined together by using an adhesive, it is common to apply the adhesive and then press the adhesive to cure the adhesive. However, according to the laminated plywood PW according to the present embodiment, since the woods are joined without using an adhesive by the compacting process, the separate joining described above is required. A process is unnecessary and the manufacturing process can be simplified.

  The laminated plywood PW obtained in this way is compacted to reduce the gaps in the oil palm thin plate W, and the lignin, hemicellulose, etc. that constitute the cell wall are softened / decomposed and recombined / recombined. The disadvantage of the oil palm thin plate W, which is crystallized to increase the cell density, has a low specific gravity, is low in strength, and easily deforms, is complemented, and high strength and stable dimensional shape are ensured. In particular, the entire thickness of the laminated oil palm sheet W is uniformly compressed by carrying out the consolidation process so that the air-drying specific gravity is 0.8 or more, the properties of the oil palm sheet W are changed, and the hardness and the like are remarkable. In addition, there is less variation in physical properties and characteristic values such as hardness, and there is also little variation in expansion rate and drying rate due to changes in ambient environmental conditions, so that deformation and the like can be suppressed, thereby improving dimensional shape stability. Increase. Therefore, the physical properties are stable, the quality between products is small, and the commercial value is high. Furthermore, it is consolidated in a state where a plurality of dried oil palm thin plates W are laminated, and the expansion rate and contraction rate due to changes in ambient environmental conditions are almost uniform on the bonding surface, so that stable bonding is maintained. In addition, a stable dimensional shape is ensured without causing distortion, deformation, cracks, and the like due to stress applied to the joint surface due to changes in ambient environmental conditions.

In particular, when the oil palm thin plate W is laminated with the same fiber direction, the surface layer fibers softened in the consolidation process are the same as the fiber layer of the Lauan thin plate L, which is adjacent in the vertical direction. The oil palm thin plate W and the Lauan thin plate L, which are easily entangled with the fibers and fixed in the entangled state, are firmly joined. In addition, since the expansion rate and contraction rate at the joint surface can be made completely equal, no stress is applied to the joint surface when the ambient environmental conditions change. Therefore, the bonding strength is high, the mechanical strength is also high, and high dimensional shape stability is ensured.
On the other hand, when the multilayered material NW before pressurization is laminated with the fiber directions orthogonal to each other, even if expansion and contraction force is generated due to changes in the surrounding environmental conditions after the consolidation process, the mutual woods interact with each other and specify Directional warpage deformation is prevented. In particular, when the total number of sheets is an odd number, when laminated with the fiber directions orthogonal to each other, the fiber direction of the single plate is parallel and the cross section is symmetric on the front and back, preventing distortion due to changes in ambient environmental conditions, etc. Is done.
If the total number of sheets is an even number, the same fiber direction is laminated in a part of the inside, and the others are laminated with the fiber directions orthogonal to each other, so that the front and back fiber directions are aligned and the ambient environmental conditions It is possible to prevent distortion and the like due to the change of.

And the laminated plywood PW of the present embodiment is densified by compaction processing on the front and back surfaces that are compressed surfaces, and the fibers of the oil palm thin plate W and the lauan thin plate L are entangled and fixed, and there is a concern about the environmental load. Even without using an artificial adhesive or a costly natural adhesive, it is difficult to peel off from the outer surface, and the surface quality is good. That is, since peeling from the surface of the fiber can be suppressed without using an artificial adhesive or a natural adhesive having a high cost, it is environmentally friendly and the cost can be reduced.
Furthermore, since the entire thickness is plastically processed, even if a large chamfering process or curved surface process is performed on the ridgeline on the thickness side surface, the material strength with high hardness is ensured at the end surface.

By the way, even in the case of using oil palm thin plate W in the vicinity of a soft tree center with a particularly high water content in oil palm, strength can be increased by compaction processing, or temperature and compression control is performed in compaction processing. Thus, excess water can be discharged, and the water vapor pressure inside the multi-layer material NW before pressurization is uniformly and suitably adjusted, so that swell deformation and the like after compression processing are also suppressed. Therefore, it is possible to form the laminated plywood PW having sufficient strength and stable dimensional shape. Therefore, effective utilization of the whole trunk of oil palm can be aimed at.
In particular, when the oil palm thin plate W and the lauan thin plate L which are dried are arranged and stacked on the front and back having a small air-dry specific gravity after drying, as described above, the upper press panel 10A and the lower press panel 10B A material having a low air-dry specific gravity after drying is disposed on the front and back layers that come into contact with each other, and compaction processing is performed. As a result, the difference in specific gravity between the woods is reduced, and the difference in the dimensional change rate after commercialization is also reduced. Therefore, the stability of the dimensional shape after commercialization increases.

  As described above, the laminated plywood PW according to the present embodiment peels the trunk of a soft oil palm having a high moisture content as an oil palm thin plate W and a lauan thin plate L, and then dries and further laminates and compacts them. As a result, the strength and hardness not only on the surface but also on the entire plate thickness are greatly improved, and a wide range of applications such as flooring materials, waistboard materials, indoor furniture materials, and housing exterior materials used by surface coating are expected. In particular, since the surface hardness is increased by compaction processing and sufficient strength and hardness can be ensured even if the thickness is small, the thickness can be reduced in commercialization.

The frame body 20 shown in FIG. 7 is a modification of the first embodiment and has a vertically movable structure. The frame body 20 is disposed on the lower press panel 10B of FIGS. 5 and 6 and is positioned. It replaces the hole 18.
An outer lower press disk 10Ba and an inner lower press disk 10Bb having the same height are disposed on the base plate 25 of the lower press disk 10B, and a frame groove 21 is formed therebetween. A plurality of coil springs 22 are disposed on the base plate 25 side of the frame body groove 21, and a square movable frame 23 is disposed above the coil springs 22. A cutout is formed on the inner surface of the movable frame 23 to form a fluid path 24 that guides fluid such as water vapor from the side surface of the pre-pressurized multilayer material NW. The inner periphery of the square movable frame 23 is substantially equal to the outer periphery of the pre-pressing multilayer material NW. When the pre-pressing multilayer material NW enters the square movable frame 23, the Lauan thin plate L1 and the thin plates W2,. There is no positional shift in W5. Therefore, when the upper press board 10A is lowered, even if it has a width larger than the size of the lower press board 10B, when the upper press board 10A comes into contact with the movable frame 23, the movable frame 23 becomes elastic to the plurality of coil springs 22. It descends against it and responds to the compression of the multilayer material NW before pressurization. Then, the compression of the pre-pressurized multilayer material NW is completed at the movement limit of the plurality of coil springs 22. Of course, when the upper press board 10A is inserted into the movable frame 23 of the lower press board 10B, the movable frame 23 can be fixedly arranged on the lower press board 10B. That is, the movable frame 23 of the lower press panel 10B can be fixed and compressed by the upper press panel 10A inserted into the movable frame 23.

  In this way, the thickness of the Lauan thin plate L1 and the oil palm thin plates W2,..., W5 is heated and compressed by the external force applied in the direction perpendicular to the length direction of the fibers of the Lauan thin plate L and the oil palm thin plate W. The laminated plywood PW having a compression ratio of 60% or more is manufactured as a whole, and at this time, the lauan thin plate L and the lauan thin plate L1 and the oil palm thin plates W2,. The elongation in the direction parallel to the plane of the oil palm thin plate W is regulated by the movable frame 23 and does not stretch.

  In this embodiment, after the vapor pressure is controlled, the pressure is gradually released to release the internal vapor pressure, and the water vapor pressure in the pre-pressurized multilayer material NW is lowered and fixed by cooling. When the compression is released, a laminated plywood PW having no surface deformation called bulging deformation or puncture can be formed. That is, the laminated plywood PW manufactured in the present embodiment does not cause bulging deformation or surface cracking after being released from compression, and ensures stable quality. In the present embodiment, the upper press board 10A and the lower press board 10B are compressed and fixed to obtain the laminated plywood PW. However, in the case of carrying out the present invention, a microwave used by a normal microwave oven is used. The laminated plywood PW can be obtained even if the multilayer material NW before pressurization is heated and compressed by dielectric heating at a high frequency slightly lower than the wave frequency band, and is fixed.

The four oil palm thin plates W2,..., W5 in the present embodiment have a thickness of 1.5 mm, 2.0 mm, 2.5 mm, 3.0 mm, 3.5 mm, 4.0 mm, 4.5 mm. , 5.0 mm, 5.5 mm, and 6.0 mm are compressed from the pre-pressing multilayer material NW in which five oil palm thin plates W having the same thickness are arranged so that the fiber lengths intersect at right angles. The laminated plywood PW was manufactured.
Basically, a laminated plywood PW having been subjected to a consolidation process of 3 to 10 mm was obtained with respect to a thickness of 7.5 to 30 mm of the multilayer material NW before compression before compression. The temperature of the supplied water vapor is raised to 110 to 210 degrees, and the compression force applied during that time is 20 to 50 kg / cm ² . Here, by laminating 5 sheets of 1.5 mm thin plate W, 7.5 mm pre-pressed multilayer material NW is obtained, but compression error and decompression when compressed at a predetermined compression rate at the laboratory level. Although it is 0.5% or less due to later expansion, an error is present.

Also, just in case, the five oil palm thin plates W in the present embodiment have thicknesses of 1.5 mm, 2.0 mm, 2.5 mm, 3.0 mm, 3.5 mm, 4.0 mm, 4.5 mm. , 5.0 mm, 5.5 mm, and 6.0 mm are compressed from the pre-pressing multilayer material NW in which five oil palm thin plates W of the same thickness are arranged so that the fiber lengths are parallel to each other. A laminated plywood PW was produced.
Similar to the former, a laminated plywood PW was obtained that was subjected to consolidation of 3 to 10 mm with respect to a thickness of 7.5 to 30 mm of the multilayer material NW before compression basically before compression. The temperature of the water vapor to be supplied is increased from 110 ° C. to 210 ° C., and the compression force applied during that time is 20 to 50 kg / cm ² .

  In Table 1, the pre-pressing multilayer material NW in which the five oil palm thin plates W having the same thickness are arranged so that the fiber (vascular bundle) length intersects at right angles is shown as “cross-bonded state”, and the fiber length is The parallel multi-layer material NW before pressurization was shown as “parallel joined state”. Table 1 shows the results of the endurance test. It is placed in a place where sunlight is used for three months from April to June, and the water is set to 30 at 10 and 4 o'clock on sunny days under natural weather conditions. Sprayed for a minute. In the “cross-bonded state” 1.5 mm and 2.0 mm laminated plywood PW, the surface was partially not flush, and there was a possibility that bubbles were generated and peeled inside. That is, it has been found that the usage environment conditions are restricted. In this test, the response to a sudden change in natural temperature was examined. Here, it is proved that the “parallel joined state” is easier to bond with each other than the “cross joined state”, and a good strength can be obtained. However, since the fiber direction of the vascular bundle is fixed in a specific direction, the flatness as a plate is lacking, but conversely, the laminated plywood PW is wound and conveyed, or used as a specific arc-shaped concrete frame, etc. You can also

However, in other samples, since hemicellulose has a function of binding lignin and cellulose, it is unclear how much they interfere with each other in the naturally cultivated state of oil palm trunk WD. By raising the temperature to a predetermined temperature (120 ° C. or higher), for example, 80 ° C. or higher of the reaction start temperature of lignin, it becomes 60 ° C. or higher of the reaction start temperature of hemicellulose. It turned out to be a material.
For cross-bonded 1.5mm and 2.0mm laminated plywood PW, 0.4-1.2mm
When the vascular bundles cross each other, the absolute amount of hemicellulose, lignin, and cellulose that can be obtained at a given temperature and compressive force even if hemicellulose binds lignin and cellulose at the crossing position of the unique vascular bundle. There are few, and it is estimated that joining is not performed completely.

Moreover, the inventors performed the test of Table 2 and Table 3 as severe use conditions. Although many samples were used, the samples submitted this time are extracted from the areas where remarkable features appear.
The laminated plywood A is composed of five oil palm thin plates W of 3.0 mm oil palm thin plates W2,..., W5 and a 3.0 mm lauan thin plate L1, and the thickness of the oil palm thin plate W is set to 3.0 mm. Is. The laminated plywood B includes four oil palm thin plates W and a 3.0 mm lauan thin plate L1. The thickness of the oil palm thin plate W is 2.5 mm + 3.0 mm + 2.5 mm + 3.0 mm. The laminated plywood C is composed of a 3.0 mm lauan thin plate L1 and three oil palm thin plates W, and the thickness of the oil palm thin plate W is 2.5 mm + 3.0 mm + 2.5 mm. The laminated plywood D is composed of a 3.0 mm lauan thin plate L1 and three oil palm thin plates W, and the thickness of the oil palm thin plate W is 3.0 mm + 3.0 mm + 3.0 mm. In either case, the uppermost position is the lauan thin plate L1 having a thickness of 3.0 mm.
The overall compression ratio of the multilayer material NW before pressurization and the laminated plywood PW was calculated by the formula {(thickness of the multilayer material NW before pressurization) − (thickness of the laminated plywood PW)} / thickness of the multilayer material NW before pressurization. .

Here, a rigorous test was conducted in which it was applied to 30 ° C. hot water and 60 ° C. hot water. The laminated plywood A and the laminated plywood B did not change within 90 minutes even when immersed in hot water at 30 ° C. However, when immersed in hot water at 60 ° C., the laminated surface of laminated plywood B softened in 45 minutes, and the laminated surface of laminated plywood A softened in 60 minutes.
Further, in the laminated plywood C, the laminated surface was softened in 45 minutes even when immersed in hot water at 30 ° C. That is, this is not a problem of 60 ° C. or higher of the reaction start temperature of hemicellulose, but it can be estimated that the influence of compressive force is exerted. When the compressive force is increased, air inside the laminated plywood C disappears and dense bonding is performed. However, if the compressive force is weak, only formal bonding is performed without crushing the fibers. It is estimated that the whole was softened. Of course, the laminated surface softened in 30 minutes even when immersed in hot water at 60 ° C.
The laminated plywood D is attached to 30 ° C. hot water in 60 minutes or less by increasing the thickness of the oil palm sheet W and increasing the compressive force, and 45 minutes even with 60 ° C. hot water. I endure below. Therefore, it is a necessary requirement to increase the compression force. From the viewpoint of the compression rate, a compression rate of 60% or more, more preferably 65% or more is desirable. In particular, when the compression rate is 70% or more, the safety is increased. When the compression rate is low, it is desirable to apply a water-repellent coating agent to the surface.
On the other hand, when the test data of only the oil palm sheet W is listed, the results are as shown in Tables 4 and 5.

Moreover, the inventors performed the test of Table 4 and Table 5 of the oil palm thin board W only. This sample is also extracted from the area where remarkable features appear.
The laminated plywood E is composed of four oil palm thin plates W, and the thickness of the oil palm thin plate W is 3.0 mm. The laminated plywood F is composed of four oil palm thin plates W, and the thickness of the oil palm thin plate W is 2.5 mm + 3.0 mm + 2.5 mm + 3.0 mm. The laminated plywood G is composed of three oil palm thin plates W, and the thickness of the oil palm thin plate W is 2.5 mm + 3.0 mm + 2.5 mm. The laminated plywood H is composed of three oil palm thin plates W, and the thickness of the oil palm thin plate W is 3.0 mm + 3.0 mm + 3.0 mm.

Here, a rigorous test was conducted in which it was applied to 30 ° C. hot water and 60 ° C. hot water. The laminated plywood E and the laminated plywood F did not change within 90 minutes even when immersed in hot water at 30 ° C. However, when immersed in hot water at 60 ° C., the laminated surface softened in 45 minutes.
Moreover, in the laminated plywood G, the laminated surface softened in 30 minutes even when immersed in hot water at 30 ° C. That is, this is not a problem of 60 ° C. or higher of the reaction start temperature of hemicellulose, but it can be estimated that the influence of compressive force is exerted. If the compressive force is increased, the air inside the laminated plywood G disappears and dense bonding is performed. However, if the compressive force is weak, only formal bonding is performed without crushing the fibers. It is estimated that the whole was softened. Naturally, even when immersed in hot water at 60 ° C., the laminated surface softened in 15 minutes.
And the laminated plywood H is attached to hot water at 30 ° C. without problems for 45 minutes by increasing the thickness of the oil palm thin plate W and increasing the compressive force, and even at 60 ° C. hot water for 15 minutes. I endure. Therefore, it is a necessary requirement to increase the compression force, and a compression rate of 65% or more is desirable in terms of the compression rate. In particular, a compression rate of 70% or more increases safety. When the compression rate is low, it is desirable to apply a water-repellent coating agent to the surface.

That is, as a test, when the compressibility is 65% or more, the oil palm thin plate W is a multilayer material NW before pressurization in which the fiber (vascular bundle) lengths are perpendicular to each other, Since the thickness of the oil palm thin plate W has a boundary line at 2.5 mm, it is preferably 2.5 mm or more. Here, when the Lauan thin plate L1 and the oil palm thin plate W are mixed, the oil palm thin plate W is applied with a compressive force higher than that, and the compressive force of the Lauan thin plate L1 is weakened. A processed laminated plywood PW is obtained.
In particular, there are no conditions in which the laminated plywood PW is immersed in hot water at 30 ° C. in nature. However, if the thickness of the oil palm thin plate W is 2.5 mm and the compression rate is 65% or more, it can be used. Show.
In addition, the condition that the laminated plywood PW is immersed in hot water at 60 ° C. is to confirm the possibility that hemicellulose inhibits the binding between lignin and cellulose. If the compression ratio is 65% or more, It also indicates that it is difficult to appear.
However, since it means that the boundary line of the compressibility is about 65%, in mass production, it is desirably 65% or more, and the thickness of the oil palm thin plate W is also 3.0 mm or more. Is desirable.

The joint partial fracture test of this embodiment was performed.
In the test, the lauan thin plate L1 of about 3 mm thickness and the oil palm thin plates W2,..., W5 of about 3 mm thickness are compacted to a thickness of about 11 mm, cut into a 20 cm square, and adhesive on both sides. When the 30 mm zelkova plates J and K are pasted and a tensile force is applied between the zelkova plate J and the zelkova plate K on both sides, the Lauan thin plate is obtained by joining only the resin component and the sugar component contained in the oil palm thin plate W. It peeled between L1 and the oil palm thin board W2. Then, although it experimented using five laminated plywood PW, all peeled between the lauan thin board L1 and the oil palm thin board W2.

  Therefore, a thermosetting resin is applied in advance to the surface of the lauan thin plate L1 facing the oil palm thin plate W2, and the lauan thin plate L1 having a thickness of about 3 mm and the oil palm thin plates W2,. Compacted. And in order to peel between lauan thin plate L1 and oil palm thin plate W2, tensile force was given between double-sided zelkova plate J and zelkova plate K, but peeling between lauan thin plate L1 and oil palm thin plate W2 Did not occur. That is, it has been confirmed that firm bonding is possible when the adhesive is replenished.

  Furthermore, the inventors conducted experiments similar to those in Tables 2 and 3 using three oil palm base materials W each having a thickness of 4 mm. It was confirmed that the compression ratio was 48.75%, which was 50%, and it was not immersed in hot water at 60 ° C. That is, it was confirmed that the compression rate should be 50% or more, and if the compression rate was 40% or more, there was no practical problem.

  As described above, the laminated plywood according to the present embodiment is formed by stripping a predetermined length of oil palm trunk WD to a predetermined thickness with a rotary race while rotating it in the circumferential direction, and then compressing it. One or more oil palm thin plates W each having a thickness of 1 mm or more, and a lauan trunk LD, a Chinese trunk, or a coniferous trunk having a predetermined length are rotated in the circumferential direction while being peeled off from the outer periphery to a predetermined thickness. One or more of the Lauan thin plate L, the China thin plate, or the conifer thin plate are arranged facing the oil palm thin plate W, and are compressed, fixed, and integrally joined.

Therefore, one or more oil palm sheet W and one or more of Lauan sheet L, China sheet, and conifer sheet are placed facing the oil palm sheet W, compressed, fixed, and joined together. Therefore, the laminated plywood PW joined with natural products using the resin component and the sugar component contained in the oil palm thin plate W is obtained. Moreover, since one or more of the lauan thin plate L, the Chinese thin plate, and the softwood thin plate can be used as a core material or as a design surface, a laminated plywood PW suitable for the application can be manufactured.
Therefore, even if a thermosetting resin is applied to the surface of the Lauan thin plate L1 facing the oil palm thin plate W2 in advance, the use fee of the adhesive becomes 1/4, and the use of the formaldehyde adhesive that causes sick house syndrome is used. The laminated plywood PW using the components inherently held by the oil palm is obtained.

  Since this oil palm trunk WD has no nodes and no annual rings, when the oil palm thin plate W is created by peeling it off from the outer periphery with a rotary race, a uniform oil palm thin plate W is obtained. As a result, the oil palm thin plate is obtained. The laminated plywood PW made of W is homogeneous. Moreover, since the joining force is changed by the resin component and sugar component contained in the oil palm trunk WD itself depending on the applied temperature and pressure, an arbitrary adhesive force can be obtained by controlling the applied temperature and pressure. In the case where a plurality of oil palm thin plates W are joined by a resin component and a sugar component contained in the oil palm trunk WD itself to form the laminated plywood PW, other synthetic resins and synthetic rubbers are used as adhesives. Because it is not, it can be returned to nature and does not cause pollution problems.

Furthermore, the oil palm stem WD itself contains almost no voids in the oil palm thin plate W due to compressive force when joined by the action of resin components such as lignin and saccharides such as cellulose and hemicellulose, resulting in a dense structure. It is water-resistant and has excellent waterproofing and insect-proofing properties, and even if used as a building material, it has a long service life.
In particular, hemicellulose has a function of binding lignin and cellulose, and it is unclear how much they interfere with each other when the oil palm trunk WD is naturally cultivated. However, it was confirmed that by raising the temperature to a predetermined temperature, for example, 80 ° C. or more of the reaction start temperature of lignin, the reaction start temperature of hemicellulose was 60 ° C. or more, and they reacted with each other to become firm characteristics.

The laminated plywood PW of the above embodiment is formed by peeling a predetermined length of oil palm trunk WD from the outer periphery with a rotary race while rotating it in the circumferential direction, and the thickness of one piece obtained by compacting it is 1 mm. Two or more oil palm thin plates W composed of the above and a Lauan thin plate L formed by peeling a predetermined length of a Lauan stem LD or a Chinese stem or a coniferous tree to a predetermined thickness with a rotary race while rotating in the circumferential direction, Alternatively, one or more of a Chinese thin plate or a softwood thin plate is arranged facing the oil palm thin plate W, and they are integrally joined.
Therefore, at least two oil palm thin plates W that have been compacted and one or more of Lauan thin plate L, China thin plate, and softwood thin plate are arranged facing the oil palm thin plate W, and they are joined together. Therefore, when the resin component and the sugar component contained in the oil palm sheet W are insufficient, an adhesive is added to one or more joining objects of the Lauan sheet L, the China sheet, and the conifer sheet. A desired laminated plywood PW is manufactured by bonding. Therefore, since the adhesive is used when the resin component and the sugar component contained in the oil palm thin plate W are insufficient, the use of the formaldehyde adhesive that causes sick house syndrome is suppressed, A laminated plywood PW utilizing the components it has is obtained.

Two or more oil palm thin plates W arranged facing the oil palm thin plate W of the above embodiment and integrally joined, and one or more of the Lauan thin plate L, the China thin plate or the softwood thin plate are integrally joined. The laminated plywood PW is formed by using a resin component and a sugar component contained in the oil palm thin plate W for joining, compressing and fixing them, and joining them integrally.
Accordingly, two or more oil palm thin plates W and one or more of Lauan thin plate L, China thin plate or softwood thin plate are used as laminated plywood PW, and are integrated using the resin component and sugar component contained in oil palm thin plate W. Therefore, the use of a formaldehyde adhesive that causes sick house syndrome can be suppressed, and a laminated plywood PW using components inherently possessed by the oil palm trunk WD can be obtained.

  In order to join two or more oil palm thin plates W that are arranged facing the oil palm thin plate W of the above embodiment and are integrally joined, the resin component and sugar component contained in the oil palm thin plate W are used, and the Lauan thin plate L Or, since the resin surface and the sugar component contained in the oil palm thin plate W are added to the joint surface that is integrally joined to any two or more of the Chinese thin plate or the softwood thin plate, other adhesives are added. For joining one or more oil palm sheets W, resin components and sugar components contained in the oil palm sheets W are used, and one or more of either Lauan sheets L, China sheets, or softwood sheets are bonded. Therefore, it is possible to obtain a laminated plywood PW that uses components inherent in oil palm and suppresses the use of formaldehyde adhesives that cause sick house syndrome. .

The thin plate process is a process in which the oil palm trunk WD having a predetermined length according to the above embodiment is rotated in the circumferential direction thereof and peeled with a blade CT from the outer periphery to a predetermined thickness by a rotary race to form the Lauan thin plate L and the oil palm thin plate W. can do. Moreover, the process of drying the lauan thin plate L and the oil palm thin plate W may be the same process as the process of forming the lauan thin plate L and the oil palm thin plate W, or may be a separate process, and this is the drying process. be able to.
And the process of laminating the dried lauan thin plate L and oil palm thin plate W as a multilayer material NW before pressurization in a predetermined state is usually used by laminating in units of 2 to 5 sheets, In principle, two or more sheets may be stacked, and this can be used as a stacking process.
In particular, by reducing the number of lauan thin plates L than the number of oil palm thin plates W, the use of formaldehyde-based adhesives that cause sick house syndrome is suppressed to ½ or less compared to at least conventional laminated plywood. be able to.

Further, in the step of heating to raise the temperature of the lauan thin plate L and the oil palm thin plate W laminated after the laminating step, the step of introducing water vapor or electric heat and heating or heating with the hot platen supplies heating energy. Therefore, it can be a heating step. Furthermore, the step of applying a compressive force in a direction perpendicular to the surface of the lauan thin plate L and the oil palm thin plate W to the laminated lauan thin plate L and oil palm thin plate W heated by the heating step is a predetermined compression. It is only necessary to compress the Lauan thin plate L and the oil palm thin plate W at a rate, that is, the compression of the multilayer material NW before pressurization. This step can be a compression step.
In addition, after compressing for a predetermined time in the compression step, the temperature supplied in the heating step is lowered, the compression state of the laminated plywood PW is fixed, and the compression force compressed at a predetermined compression rate is released. This can be taken from the laminated plywood PW and used as an immobilization process.

  As described above, the laminated plywood PW of the above-described embodiment is a plurality of sheets that are peeled with the blade CT from the outer periphery to the predetermined thickness by the rotary race while rotating the lauan thin plate L and the oil palm thin plate W in a predetermined length in the circumferential direction. The thin plate process of Step S10 and Step S11 formed on the Lauan thin plate L and the oil palm thin plate W, the drying step of Step S20 and Step S21 for drying the thin plate W, and the Lauan thin plate L and the oil palm dried in the drying step. A laminating step of step S30 for laminating a plurality of thin plates W in a predetermined state, and a heating step of step S43 for heating to raise the temperature of the lauan thin plate L and the oil palm thin plate W laminated after the laminating step; The lauan thin plate L and the laminar thin plate L and the oil palm thin plate W heated by the heating step A compression step of step S44 for compressing for a predetermined time by applying a compression force in a direction perpendicular to the surfaces of the lauan thin plate L and the oil palm thin plate W while restricting extending in a direction parallel to the surface of the oil palm thin plate W; Then, after pressing for a predetermined time in the compression step, the fixing step of Step S60 is performed in which the temperature supplied in the heating step is lowered and fixed.

  Therefore, since the oil palm trunk WD used in these processes has no nodes and no annual rings, when the Lauan thin plate L and the oil palm thin plate W are prepared by peeling off from the outer periphery with a rotary race to a predetermined thickness, the homogeneous Lauan thin plate L and The oil palm thin plate W is obtained, and as a result, the laminated plywood PW composed of the lauan thin plate L and the oil palm thin plate W becomes homogeneous. In addition, since the bonding force can be changed by the action of resin components such as lignin contained in the oil palm trunk WD itself and sugars such as cellulose and hemicellulose, depending on the applied temperature and compressive force, the control of the applied temperature and compressive force is possible. Arbitrary adhesive strength can be obtained. And since the lauan thin plate L and the oil palm thin plate W are joined by the action of resin components such as lignin contained in the oil palm trunk WD itself and sugars such as cellulose and hemicellulose, the laminated plywood PW is formed. Because other synthetic resins and synthetic rubber are not used as adhesives, they can be returned to nature and cause no pollution problems. Furthermore, due to the compressive force when the oil palm trunk WD itself contains resin components such as lignin and the sugars such as cellulose and hemicellulose, the gap between the lauan thin plate L and the oil palm thin plate W is almost eliminated, and the dense Since it becomes an organization, it is water-resistant, and is water-proof and insect-proof, and has a long service life even when used as a building material.

Manufacture of the laminated plywood of the said embodiment can be generalized as embodiment of the manufacturing method of a laminated plywood as follows.
A thin plate process comprising step S10 of forming a plurality of oil palm thin plates W by peeling a predetermined length of an oil palm trunk WD from the outer periphery to a predetermined thickness with a blade CT while rotating the oil palm trunk WD in the circumferential direction, and a predetermined length of oil A thin plate process comprising step S11 of forming a non-palm trunk, for example, a lauan stem LD, with a rotary lace to a predetermined thickness from the outer periphery with a cutter CT while rotating it in the circumferential direction to form a thin plate such as a lauan thin plate L. A drying process comprising steps S20 and S21 for drying other peeled thin plates such as the oil palm thin plate W and the lauan thin plate L formed in the thin plate step, and the oil palm dried in the drying step. Lamination process comprising step S30 of laminating a plurality of other peeled thin plates such as thin plate W and lauan thin plate L in a predetermined state The heating step comprising step S43 for heating to raise the temperature of the other peeled thin plates such as the oil palm thin plate W and the lauan thin plate L laminated after the lamination step, and the lamination heated by the heating step A positioning hole 18 or a frame 20 extends in a direction parallel to the surface of the other peeled thin plate such as the oil palm thin plate and the lauan thin plate L to the other peeled thin plate such as the oil palm thin plate and the lauan thin plate L. A compression process comprising a step S44 of compressing for a predetermined time by applying a compression force in a direction perpendicular to the surfaces of the other peeled thin plates such as the oil palm thin plate and the lauan thin plate L, and the predetermined in the compression step. Step S for fixing the other peeled thin plates such as the oil palm thin plate W and the lauan thin plate L which have been time-compressed by lowering the temperature supplied in the heating step. Fixing step of zero can be the method for producing a laminated plywood having a.

  Each side of the five lauan thin plates L1 and the oil palm thin plates W2,..., W5 in the laminating step for laminating the lauan thin plate L and the oil palm thin plate W, which are dried in the drying step of the above embodiment, in a predetermined state. The frame body 20 or the positioning hole 18 for positioning the frame 20 is the frame body 20 or the positioning hole 18 for regulating a predetermined stacking surface, and regulates the upper and lower sides and the left and right sides of the plurality of thin plates W. Therefore, the thin plate W is prevented from extending in a direction perpendicular to the surface to which the compressive force is applied, and a thick portion and a thin portion are not generated depending on the position of the laminated plywood PW.

  In the laminated plywood PW of the above-described embodiment, the lauan thin plate L1 and the laminar thin plate W1 of the plurality of laminated oil palm thin plates W2, ..., W5 are used as the lauan thin plate L other than the oil palm thin plate W, and the oil palm thin plate The laminated plywood PW including the lauan thin plate L other than W is integrally joined. As described above, the laminated plywood PW formed by integrally joining the oil palm thin plates W2,..., W5 in the joining composition of the oil palm thin plates W2,. By arranging one oil palm thin plate W1 of the thin plates W2,..., W5 as a Lauan thin plate L other than the oil palm thin plate W, as shown in FIG. The oil palm thin plates W2,..., W5 can be joined with the adhesive ability. Moreover, it can be set as the design which utilized the grain arrange | positioned in the exposed surface of those one sides. Accordingly, only one surface of the laminated plywood PW can be made of thin wood made of other materials. In particular, it is suitable for use as a decorative board.

In the laminating step of laminating a plurality of lauan thin plates L and oil palm thin plates W in a predetermined state in the above embodiment, one surface of the lauan thin plate L1 and oil palm thin plates W2,. 1 or 2 on both end surfaces is a lauan thin plate L made of wood other than oil palm thin plates W2,..., W5, and laminated plywood PW including thin plates other than oil palm thin plates W1,. Are integrally joined. Here, the oil palm thin plate W can be 1 or more.
Of course, the wood other than the oil palm thin plates W1,..., W5 can be the Lauan thin plate L, or a Chinese thin plate or a coniferous thin plate in place of the Lauan thin plate L. Alternatively, one or a combination of the two can be used.
[Embodiment 2]

In the first embodiment, the lauan thin plate L made of wood other than the oil palm thin plates W2,..., W5 is used as the lauan thin plate L1 and the oil palm thin plates W2,. As explained in the examples, when practicing the present invention, the laminated plywood PW can be configured by only the oil palm thin plates W1,..., W5.
Specifically, as shown in FIGS. 10 and 11, a laminated plywood PW is formed only by the oil palm thin plates W1,..., W5, and is laminated as shown in FIG. NW.

  The set of oil palm thin plates W1,..., W5 of this embodiment is a pre-pressurized multilayer material NW in which the oil palm thin plate W is disposed also on the exposed surface. For the pre-pressing multilayer material NW consisting only of the oil palm thin plates W1,..., W5, as in the first embodiment, the entire fiber direction is the same, or one or more multilayer thin plates are used. Can be in different fiber (vascular bundle) directions. That is, only the thin plate process of step S10 in which the oil palm trunk WD having a predetermined length is rotated in the circumferential direction thereof and peeled with the blade CUT to a predetermined thickness by a rotary race to form a plurality of oil palm thin plates W can be performed. .

  In this embodiment, step S10 is a process comprising a step of forming a plurality of oil palm thin plates W by rotating a predetermined length of oil palm trunk WD in the circumferential direction while peeling it with a cutter CT from the outer periphery to a predetermined thickness with a rotary race. , The drying step of step S20 for drying the oil palm thin plate W formed in the thin plate step, and the laminating step of step S30 for laminating a plurality of oil palm thin plates W dried in the drying step in a predetermined state And heating step S43 for heating to raise the temperature of the laminated oil palm thin plate W after the laminating step, and the laminated oil palm thin plate W heated by the heating step to the oil palm thin plate The oil palm thin film is controlled by the positioning hole 18 or the frame body 20 while extending in the direction parallel to the surface of W. The compression process in step S44, in which a compression force in a direction perpendicular to the surface of W is applied to compress the surface for a predetermined time, and the oil palm sheet W compressed in the compression process for a predetermined time in the heating process are lowered in temperature. It can be set as the manufacturing method of the laminated plywood which comprises the fixing process of step S60 made to fix.

  A frame for positioning each side of the five oil palm thin plates W2,..., W5 in the laminating step of step S30 for laminating the oil palm thin plates W dried in the drying step of the above embodiment in a predetermined state. 20 or the positioning hole 18 is the frame 20 or the positioning hole 18 that regulates a predetermined stacking surface, and regulates the top and bottom and the left and right of the surface of the plurality of thin plates W. Therefore, the thin plate W is prevented from extending in a direction perpendicular to the surface to which the compressive force is applied, and a thick portion and a thin portion are not generated depending on the position of the laminated plywood PW.

In the laminated plywood PW of the above embodiment, the plurality of laminated oil palm thin plates W1,..., W5 are integrally joined as a laminated plywood PW made of the oil palm thin plate W. As described above, the laminated plywood PW formed by integrally joining the oil palm thin plates W1,..., W5 in the joining composition of the oil palm thin plates W1,. .., W5 can be joined by the adhesive ability of oil palm thin plates W1,..., W5 as shown in FIG. Therefore, the laminated plywood PW is obtained.
In the laminating step of laminating a plurality of oil palm thin plates W of the above-described embodiment in a predetermined state, a plurality of laminated oil palm thin plates W1,..., W5 are integrally joined as a laminated plywood PW. It is. Here, the oil palm thin plate W can be one or more.

  Thus, according to the method for manufacturing the laminated plywood of the second embodiment, the blade is rotated from the outer periphery to the predetermined thickness by the rotary race while rotating the oil palm trunk WD having a predetermined length in the circumferential direction in the thin plate process of step S10. A plurality of oil palm thin plates W are formed by peeling with a CUT. The oil palm thin plate W formed in the thin plate process of step S10 is dried in the drying step of step S20, and a plurality of dried oil palm thin plates W are laminated in a predetermined state in the lamination step of step S30, and the laminated oil While heating in 43 heating steps to increase the temperature of the palm sheet W, and restricting the heated oil palm sheet W to extend in a direction parallel to the surface of the oil palm sheet W, A compressive force in a direction perpendicular to the surface of the oil palm sheet W is applied and compressed for a predetermined time in the compression process of Step S44, and the oil palm sheet W compressed for a predetermined time in the compression process of Step S44 is supplied in the heating process of Step S43. Lower the temperature, and fix it.

  Therefore, since the oil palm trunk WD has no nodes and no annual rings, when the oil palm thin plate W is created by peeling it off from the outer periphery with a rotary race, a uniform thin plate is obtained. As a result, from the oil palm thin plate W, The resulting laminated plywood PW is homogeneous. Moreover, since the joining force is changed by the resin component and sugar component contained in the oil palm trunk WD itself depending on the applied temperature and compressive force, an arbitrary adhesive force can be obtained by controlling the applied temperature and compressive force. The plurality of oil palm thin plates W are joined by a resin component and a sugar component contained in the oil palm trunk WD itself to form a laminated plywood PW, and other synthetic resins and synthetic rubbers are used as adhesives. Because it is not, it can be returned to nature and does not cause pollution problems. Furthermore, because of the compressive force when the oil palm trunk itself contains the resin component and the sugar component, there is almost no void in the oil palm thin plate W, resulting in a dense structure, water resistance, and It is highly waterproof and insect-proof and has a long service life even when used as a building material. In addition, since the oil palm trunk WD has the ability to form an uneven surface opposite to the uneven surface, the joining here includes mechanical joining using the forming ability.

In this way, a predetermined length of the oil palm trunk WD is formed by peeling it to a predetermined thickness with a rotary race while rotating it in the circumferential direction, and when one of them is compacted, a plurality of sheets each having a thickness of 1 mm or more The oil palm thin plate W can be compressed and fixed at the same time and joined together. In particular, the temperature of the oil palm sheet W laminated after the lamination process in step S30 is heated to increase in the heating process, and the oil palm sheet W is heated to the laminated oil palm sheet W heated in the compression process of step S44. The compression is applied for a predetermined time by applying a compressive force in a direction perpendicular to the surface of the oil palm thin plate W while restricting extending in a direction parallel to the surface of the oil palm. The extension that the compression force escapes in the direction parallel to the surface of the oil palm sheet W is limited, the compression force of all the laminated oil palm sheets W is used effectively, and the compression of all the oil palm sheets W is performed. The rate can be made uniform, and there is no waste from a plurality of oil palm thin plates W during manufacture.
Therefore, the laminated plywood PW bonded with natural products using the resin component and sugar component contained in the oil palm thin plate W is obtained, the loss of the material used is reduced, the cost is reduced, and the formaldehyde system causing sick house syndrome The use of the adhesive is suppressed, and the laminated plywood PW using the components that oil palm originally has is obtained.

  In the thin plate process of step S10 or step S11 of the manufacturing method of the laminated plywood of the first embodiment and the second embodiment, the number of oil palm thin plates W is larger than the number of lauan thin plates L such as lauan other than oil palm. Therefore, compared to at least the conventional laminated plywood PW, the use of formaldehyde-based adhesive that causes sick house syndrome can be suppressed to ½ or less.

  In the laminating process of step S30 in which a plurality of oil palm thin plates W and lauan thin plates L of the laminated plywood manufacturing method according to the first embodiment and the second embodiment are laminated, the fiber directions are set in the same direction. Since the fibers are laminated with the same fiber direction, the fibers are joined along the length direction of the original trunk, and the fibers softened in the consolidation process are the other fibers adjacent to the lamination direction with the same fiber direction. It is easily entangled with the fiber and is fixed in the entangled state. That is, the fibers are entangled with each other by the consolidation process, and the bonding strength is increased. Therefore, the mechanical strength is high, and a stable dimensional shape after consolidation is ensured. Furthermore, by laminating the fibers in the same fiber direction, the expansion rate and contraction rate at the joint surface can be made completely the same, and the dimensional shape stability is higher without applying stress. .

  The laminating process of step S30 for laminating a plurality of oil palm thin plates W and lauan thin plates L of the laminated plywood manufacturing method of the first embodiment and the second embodiment is such that the fiber directions are orthogonal to each other. Therefore, even if expansion and contraction force occurs due to changes in ambient environmental conditions after compaction processing, the fibers interact with each other to prevent warping deformation in a specific direction, resulting in a good balance state and stable dimensional shape Improves.

  The drying process of step S20 or step S21 of the manufacturing method of the laminated plywood according to the first embodiment and the second embodiment is to dry the moisture content of the oil palm thin plate W within a range of 5% to 30%. Therefore, cracks, deformation, swelling, rupture and the like are prevented. Therefore, more stable dimensional shape is ensured and the yield is high. Moreover, when the moisture content is in a dry state within a range of 10% to 30%, it is also suitable for joining with a Lauan thin plate, a Chinese thin plate, a conifer thin plate, or the like.

  Since the heating temperature in the heating process of step S43 of the manufacturing method of the laminated plywood according to the first embodiment and the second embodiment is within the range of 110 ° C. to 170 ° C., immobilization failure in the consolidation process and It is possible to prevent poor bonding between wood, and material deterioration such as surface carbonization and lowering of material strength. In addition, when the heating temperature is in the range of 110 ° C. to 170 ° C., it is also suitable for joining to a Lauan thin plate, a Chinese thin plate, a conifer thin plate, or the like.

Since the predetermined compression pressure by the compression process of step S44 of the manufacturing method of the laminated plywood of this Embodiment 1 and this Embodiment 2 is made into the range of 1-100 kg / cm < ² >, it fixes in compaction processing It is possible to prevent defective formation, poor connection between woods, and generation of surface cracks. It was confirmed that there was no problem in joining with Lauan sheet, China sheet, conifer sheet.

Since the time required for the heating process in step S43 and the compression process in step S44 of the method for manufacturing the laminated plywood according to the first embodiment and the second embodiment is within a range of 10 minutes to 120 minutes, It is possible to prevent improper fixing, poor bonding between woods, and carbonization of the surface. It has been confirmed by the inventors' experiments that there is no problem in joining with Lauan thin plate, China thin plate, coniferous thin plate and the like.
The composition that contributes to the consolidation of the oil palm base material W of the present embodiment includes resin components such as lignin and the like, cellulose, hemicellulose and the like that the oil palm base material W made from the oil palm trunk WD having a predetermined length. The sugar component. The inventors' analysis recognizes that the main component is a resin component such as lignin and a saccharide component such as cellulose and hemicellulose. However, if the analytical ability is improved, the involvement of other components cannot be denied. Even if it is small, it cannot be denied that there may be other components that contribute to consolidation.

WD Oil palm trunk CT Cutlery W, W1,..., W5 Oil palm thin plate UWD Continuous thin plate LD Rawan stem L Rawan thin plate PW Laminated plywood NW Multi-layer material MC before press Hole 20 frame

Claims (9)

A thin plate step of peeling a predetermined length of oil palm trunk to a predetermined thickness in the circumferential direction with a blade to form a plurality of oil palm thin plates,
A drying step of drying the oil palm thin plate formed in the thin plate step;
A laminating step of laminating a plurality of oil palm thin plates dried in the drying step in a predetermined state;
A heating step of heating to raise the temperature of the laminated oil palm sheet after the laminating step;
A compression force in a direction perpendicular to the surface of the oil palm thin plate is applied to the laminated oil palm thin plates heated by the heating step while restricting the oil palm thin plate from extending in a direction parallel to the surface of the oil palm thin plate. A compression process for compressing for a predetermined time,
An oil palm thin plate compressed for a predetermined time in the compression step, and an immobilization step for lowering and fixing the temperature supplied in the heating step;
The laminated oil palm thin plates are consolidated by the heating step, the compression step, and the fixing step, and the laminated oil palm is obtained by using the sugar and resin components contained in the oil palm thin plate by the consolidation. A method for producing a laminated plywood, wherein thin plates are joined together . A step of peeling a predetermined length of oil palm trunk to a predetermined thickness in the circumferential direction to form a plurality of oil palm thin plates, and a piece of trunk other than the predetermined length of oil palm to a predetermined thickness in the circumferential direction A thin plate process comprising the steps of forming the above thin plate;
A drying step of drying the oil palm thin plate formed in the thin plate step and other stripped thin plates;
A laminating step of laminating a plurality of oil palm thin plates dried in the drying step and other stripped thin plates in a predetermined state;
A heating step of heating to raise the temperature of the laminated oil palm lamina and other stripped lamina after the laminating step;
The oil palm thin plate is controlled to extend in a direction parallel to the surfaces of the oil palm thin plate and the other peeled thin plate to the laminated oil palm thin plate and the other peeled thin plate heated by the heating step. And a compression step of compressing for a predetermined time by applying a compressive force in a direction perpendicular to the surface of the other stripped thin plate;
An oil palm thin plate compressed for a predetermined time in the compression step and another stripped thin plate, and a fixing step of fixing the temperature by lowering the temperature supplied in the heating step,
The laminated oil palm sheet and other stripped sheets are consolidated by the heating process, the compression process and the fixing process, and the sugar and resin components contained in the oil palm sheet are used by the consolidation process. The laminated plywood manufacturing method, wherein the laminated oil palm thin plate and the other peeled thin plate are joined together .   The method for producing a laminated plywood according to claim 2, wherein the thin plate step has a larger number of oil palm thin plates than a number of peeled thin plates other than oil palm.   The method for producing a laminated plywood according to any one of claims 1 to 3, wherein in the laminating step of laminating a plurality of the thin plates, the fiber directions thereof are the same as each other.   The method for producing a laminated plywood according to any one of claims 1 to 3, wherein in the laminating step of laminating a plurality of the thin plates, the fiber directions are orthogonal to each other.   The method for producing a laminated plywood according to any one of claims 1 to 5, wherein the moisture content of the oil palm thin plate in the drying step is dried within a range of 5% to 30%.   The method for manufacturing a laminated plywood according to any one of claims 1 to 7, wherein a heating temperature in the heating step is in a range of 110C to 170C. The predetermined compression pressure by the compression step, the manufacturing method of the laminated plywood according to any one of claims 1 to 7, characterized in that it has in the range of 1 to 100 kg / cm ^2.   The method for producing a laminated plywood according to any one of claims 1 to 8, wherein the time required for the heating step and the compression step is within a range of 10 minutes to 120 minutes.

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