JP2011167902A - Method for dividing oriented woody thermocompression molded material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a processing method capable of reducing a degree of warping and capable of improving productivity even when a thick oriented woody thermocompression molded material is divided and thinned. <P>SOLUTION: In the method for dividing and processing the oriented woody thermocompression molded material, the material is cut out from the surface, and is divided in a thickness direction. The material is preferably prepared by thermocompression-molding a laminated article of a narrow and long wood material piece with a bonding agent oriented in a longitudinal direction, and preferably has a specific gravity of 0.6-1.0, a thickness of 50 mm or more and a length of 1,800 mm or more. The wood material piece is preferably derived from thinnings, an end material, a waste pallet or a dismantled waste material, and 70% or more by weight of the wood material piece preferably has a thickness of 1-11 mm and a length of 20-150 mm. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a method for dividing an oriented wooden hot-press molded material.

  As wood, wood materials that are variously processed apart from solid wood, for example, various boards such as plywood, laminated lumber, LVL, and particle board, are often used.

  In addition, because forest resources are limited and maintenance is difficult, effective utilization of waste wood is considered promising, and as part of this, a long piece of wood with a binder oriented in the longitudinal direction is expected. There is known a molding material (hereinafter referred to as an oriented wooden hot-pressure molding material) obtained by pressurizing and heating a laminate (for example, a mat or the like) (for example, see Patent Document 1).

Applications of the oriented wooden hot-press molding material include wall-making materials such as wall core materials, but the product thickness is about 20 to 40 mm.
On the other hand, the production efficiency is improved by producing a thick product rather than a thin product.
However, if the above-mentioned thin-walled product is made from a thick-walled oriented wood-based hot-pressed material and is manufactured by split processing, etc., it must be thinned by dividing it in the thickness direction by slicing or the like. There is a problem that warpage occurs during such division.

Patent No. 3520077

  SUMMARY OF THE INVENTION An object of the present invention is to provide a processing method capable of reducing the degree of warping and improving productivity even when a thick oriented woody hot-press molded material is divided and thinned under such circumstances. .

  As a result of intensive studies to solve the above-mentioned problems, the present inventors have found that dividing the oriented wooden hot-press molded material by a predetermined depth from the pressing surface and then dividing it in the thickness direction contributes to solving the problem. Based on the finding and this finding, the present invention has been made.

  That is, according to the first invention of the present invention, the oriented wooden hot-press molded material is scraped at least 4 mm from the pressed surface, and then divided in the thickness direction. A method for dividing a material is provided.

  According to the second invention of the present invention, in the first invention, the oriented wooden hot-press molded material is obtained by hot-pressing a laminate of elongated wooden material pieces with a binder oriented in the longitudinal direction. There is provided a method for dividing an oriented wooden hot-press molded material, which is characterized by being a molded material.

  According to the third invention of the present invention, in the second invention, the wood material piece is derived from thinned wood, edge material, waste pallet material or demolition waste material, and the oriented wood heat pressure is characterized in that A method of dividing a molded material is provided.

  Further, according to the fourth invention of the present invention, in the second or third invention, the wood piece has a weight ratio of 70% or more in a range of 1 to 11 mm in thickness and 20 to 150 mm in length. A method for dividing the oriented wooden hot-press molded material is provided.

  According to a fifth invention of the present invention, in any one of the first to fourth inventions, the oriented woody hot-press molded material has a specific gravity of 0.6 to 1.0. A method of dividing a hot-pressed material is provided.

  According to a sixth aspect of the present invention, in any one of the first to fifth aspects, the oriented wooden hot-press molded material has a thickness of 50 mm or more. Are provided.

  According to a seventh invention of the present invention, in any one of the first to sixth inventions, the oriented wooden hot-press molded material has a length of 1800 mm or more. Are provided.

  According to an eighth invention of the present invention, in any one of the first to seventh inventions, the hot pressing is performed by steam heating and pressurizing with a press machine. A method of dividing a molded material is provided.

  According to a ninth invention of the present invention, there is provided a method for dividing an oriented wooden hot-press molded material according to any one of the first to eighth inventions, wherein the dividing is performed with an equal thickness. Is done.

  According to a tenth aspect of the present invention, there is provided the split wood processing method for oriented wooden hot-press molded material according to any one of the second to ninth aspects, wherein the binder is an adhesive. The

  According to the eleventh aspect of the present invention, in the tenth aspect, the adhesive is an isocyanate-based adhesive and / or a tannin-based adhesive. A method is provided.

  According to the processing method of the present invention, there is an advantage that the degree of warpage can be reduced and productivity can be improved even if a thick-walled oriented woody hot-press molded material is divided and thinned.

The processing method of the present invention is a method in which an oriented woody hot-pressed molding material (hereinafter sometimes simply referred to as a molding material) is scraped at least 4 mm from the pressurized surface and then divided in the thickness direction. is there.
Although it does not specifically limit about the said shaping | molding material, Preferably, the molding material formed by hot-press-molding the laminated body of the elongate wooden material piece with the binder orientated in the longitudinal direction is mentioned.

  The above-mentioned wood material piece is attached to the elongated wooden material piece by a process such as spraying, applying, or dipping the binder, or the elongated wooden material piece and the binder are mixed, etc. These are orientated in the longitudinal direction by an orientation device or the like.

  The tree species of the raw material of this elongated wood piece mainly includes conifers such as cedar, cypress, spruce, fur, radiata pine, and broad-leaved trees such as birch, apton, chamelere, sengonlaut, and aspen. Not only plant materials produced from forests, but also plant materials produced outside forests, such as bamboo and goryan, can be included. Forms that can be used as raw materials are not particularly limited, but include, for example, the above logs of logs, raw materials such as thinned wood, scraps generated at factories and residential construction sites, waste pallet materials discarded after transportation of materials, and construction Examples include demolition waste materials generated during dismantling.

  The processing method to make the above-mentioned raw material wood pieces is a method of cutting a veneer processed with a rotary cutter into a chopsticks shape to make a stick, a method of cutting a log into a strand with a rotary blade of a flaker, a uniaxial crushing A method of crushing wood by rotating a roll with a blade on the surface of the machine can be used. The crusher includes a machine generally called a crusher. In addition, it is possible to use a small piece manufacturing machine with cutting as the element generally used for particle board, but the small piece is thinly cut and the strength is comparatively difficult, crushing with crushing as an element The crushing chip produced by the machine is spindle-shaped and easy to obtain strength, and this is more preferable.

  When the thickness of the timber pieces crushed as described above is uneven, they are classified into pieces of wood having a certain range of thickness. The classification method is not particularly limited as long as it can be classified with a certain range of thickness. For example, a classification method using a classifier such as a wave roller method may be used. The wave roller type classifier is a device that performs continuous classification based on the thickness of the chip.

  The wood piece preferably has a specific gravity of 0.3 to 0.6, a length of 20 to 150 mm, and a thickness (short side) of 1 to 11 mm. When the specific gravity of the wooden piece exceeds 0.6, the wooden piece is hard and desired molding is difficult.

  When the wood material piece having a thickness of less than 1 mm is used, the constituent material piece becomes too small, a large amount of binder is required, and strength is not exhibited. On the other hand, if the thickness of the wooden piece exceeds 11 mm, the number of laminated wooden pieces in the thickness direction of the structural material is reduced, and the stress cannot be transmitted sufficiently. The desired strength cannot be obtained. If a wood material piece having a length of less than 20 mm is used, when used as a structural material, the strength in the axial direction becomes insufficient. If a wood material piece having a length exceeding 150 mm is used, one piece of wood material is laminated when laminated. The crossing points of the wood material pieces increase, and sufficient consolidation cannot be achieved. Since the length of the wood pieces cannot be completely separated, the effect is sufficiently exhibited if the wood pieces of a desired length are contained in a weight ratio of 70% or more, preferably 80% or more.

  Further, the ratio between the length and the thickness of the wooden piece is not particularly limited, but the length is preferably 10 times or more of the thickness. If the length is less than 10 times the thickness, the strength of the molding material in the axial direction may be insufficient.

  If the bulk density is less than 0.6, sufficient bonding of the wood pieces cannot be obtained, and there is a possibility that sufficient strength cannot be obtained. Further, the porosity is not particularly limited, but is preferably 10% or less. That is, if the porosity exceeds 10%, the bonding between the wooden material pieces in the molding material becomes insufficient, and there is a possibility that sufficient strength may not be exhibited.

  Further, it is preferable that the wood piece has a constant moisture content. By making the water content constant, there is no variation in the quality of the molding material during production. A preferable moisture content is 0 to 10%. As a method for keeping the moisture content constant, for example, a method of leaving a piece of wood material for a certain period of time in a temperature-controlled oven can be mentioned.

  Examples of the binder include phenolic resin, urea resin, isocyanate-based adhesives for wood industry used for plywood and particle board, and these binders are used alone or in combination of two or more. May be. In addition, the binder may be liquid or powdery, but in the case of liquid, it is generally sprayed on the wooden piece or mixed with the wooden piece and pre-supported on the wooden piece in a powdery state. In the case, it is generally attached in a state of being uniformly mixed with the wood piece.

  The wood material pieces to which the binder is attached are oriented in the longitudinal direction and laminated to form a mat. As a specific method, a plurality of plate-like bodies are erected in parallel along the transport direction above the belt conveyor, and a wooden material piece is dropped and oriented from above the parallel plate-like bodies. , A method of transporting while laminating on a belt conveyor and forming it on a mat, and in this method, the orientation method is to form a concavo-convex groove in the width direction so that the wooden piece is a groove And a method in which a known orientation means such as a disk orienter is arranged above the forming type, and a method in which the orientation is introduced while being oriented by the orientation means, or the like.

  A disk orienter used in a manufacturing apparatus for an existing wood-based molding material such as an oriented strand board (OSB) is used as a method for putting the wood piece with a binder obtained as described above into a forming mold. It is possible to use a method in which a known orientation means such as the above is disposed above the forming type and placed while being oriented by this orientation means, but a wood material piece with a binder is thrown into the slit-like outlet from the upper inlet. A method in which a hopper having an inner surface-shaped (bowl-shaped) orientation portion whose width decreases toward the top of the forming mold so that the discharge port faces the upper opening of each divided frame portion and is inserted through the hopper It is preferable to use it. In addition, it is possible to use a method in which ridges are arranged side by side in the width direction so as to form a concavo-convex groove shape and flow through the groove.

  In other words, by using the hopper as described above, it is possible to efficiently supply the wood material piece with the binder to each of the forming-type divided frame portions, that is, without loss. The shape of the inner surface of the hopper is determined by the forming type shape, but may be any shape that does not clog the wood with the binder. Specifically, it is preferable that the slit width of the discharge port is 15 mm or more and smaller than the inner width of the divided frame portion.

  The shape of the forming die is appropriately determined depending on the molding material to be obtained. For example, when a plate-shaped molding material of 1000 × 500 × 30 mm is obtained, a laminated mat of about 1000 × 500 × 100 mm is formed by the forming die. It must be made. That is, the vertical and horizontal dimensions of the laminated mat are prepared to be the same as or slightly larger than the vertical and horizontal dimensions of the molding material to be obtained, and the thickness of the laminated mat is at least 3 of the molding material to be obtained. It is preferable that the thickness be twice or more.

The molding material can be obtained by hot-pressing the above oriented and laminated material such as a mat.
Hot press molding is performed by heating and pressurizing using a press machine etc., for example.
The heating method is not particularly limited, but for example, there is a method of transferring heat from the surface of a wooden piece like a hot platen to the inside by heat transfer, or a method of directly heating the inside such as steam injection or high frequency heating. Can be mentioned. Heating and pressurization may be performed simultaneously, may be performed after pressurization, or may be performed after heating.

Although it does not specifically limit as a press machine, For example, what used the vertical type | mold press machine and the continuous press machine for shaping | molding the existing wood type material to a perpendicular | vertical direction operation can be used. As for the temperature conditions of a press, the range of 100-250 degreeC is preferable normally. The pressure condition is preferably in the range of 1 to 10 MPa, and if it is less than 1 MPa, it cannot be sufficiently compressed, and if it is 10 MPa or more, the equipment for pressing becomes expensive. The press time may be a time for the binder to cure.
The molded material thus obtained has a specific gravity of 0.6 or more, preferably a specific gravity in the range of 0.6 to 1.0. If the specific gravity is less than 0.6, sufficient strength cannot be obtained.

In the processing method of the present invention, the molding material, preferably having a thickness of 50 mm or more, and further having a length of 1800 mm or more is scraped at least 4 mm from the pressurized surface and then divided in the thickness direction. Processed. The removal depth to be scraped off is preferably at least 5 mm. If the depth is too shallow, it is difficult to sufficiently obtain the warp reduction effect. If the depth is too deep, it is difficult to obtain a further warp reduction effect, and the material loss increases.
The division is preferably at most 4 divisions from the viewpoint of cost and workability.
The dividing process is preferably performed with an equal thickness.

  EXAMPLES Hereinafter, although an Example demonstrates this invention further in detail, this invention is not limited at all by these examples.

Example 1
Using a building demolition material recycled chip as a raw material, preparing a chip with an adhesive made by adhering a tannin-based adhesive at a ratio of 7% by weight to the chip, and orienting the chip in its longitudinal direction, In addition, a mat is formed by laminating so as to be oriented in the longitudinal direction of the molded product to be obtained, and this mat is hot-pressure molded at 180 ° C. and 2.5 MPa for 310 seconds by a steam blow type press machine to a thickness of 80 mm. A molded material having a length of 3000 mm, a width of 300 mm, and a specific gravity of 0.65 was obtained.
Both ends in the longitudinal direction of this molding were cut to 2400 mm, the surface layer was cut by 4.0 mm, and the warpage was measured by dividing into 2 in the thickness direction. As a result, the warpage was 2.72 mm, and the warpage deformation rate with respect to the length Was as low as 0.11%.

Example 2
The warpage was measured in the same manner as in Example 1 except that the cutting depth of the surface layer was 5.0 mm. As a result, the warpage was 1.92 mm and the warpage deformation ratio with respect to the length was as low as 0.08%.

Comparative Example 1
The warpage was measured in the same manner as in Example 1 except that the cutting depth of the surface layer was 1.5 mm. As a result, the warpage was 5.86 mm and the warpage deformation ratio with respect to the length was as high as 0.24%.

Example 3
Using a building demolition material recycled chip as a raw material, preparing a chip with an adhesive in which an MDI-based adhesive is adhered to the chip at a ratio of 4% by weight, and orienting the chip in its longitudinal direction, Further, a mat is formed by laminating so as to be oriented in the longitudinal direction of the molded product to be obtained, and this mat is hot-pressure molded at 180 ° C. and 2.5 MPa for 340 seconds by a steam blow type press machine to have a thickness of 150 mm. A molded material having a length of 3000 mm, a width of 300 mm, and a specific gravity of 0.65 was obtained.
Both ends in the longitudinal direction of this molded material were cut to 2400 mm, the surface layer was cut by 4.0 mm, and the warpage was measured by dividing it into three in the thickness direction. As a result, the warpage was 2.07 mm and the warpage deformation rate with respect to the length Was as low as 0.09%.

Example 4
The warpage was measured in the same manner as in Example 1 except that the cutting depth of the surface layer was 5.0 mm. As a result, the warpage was 1.89 mm and the warpage deformation ratio with respect to the length was as low as 0.08%.

Comparative Example 2
The warpage was measured in the same manner as in Example 2 except that the cutting depth of the surface layer was 1.5 mm. As a result, the warpage was 5.22 mm and the warpage deformation ratio with respect to the length was as high as 0.22%.
From the above, it can be seen that all of the processing methods of the examples have a small warpage and a low warpage deformation rate with respect to the length as compared with the processing method of the comparative example.

The present invention can provide a method for processing an oriented wooden hot-press molded material that can reduce the degree of warping and improve productivity even if the thick-walled oriented wooden hot-press molded material is divided and thinned. It is very useful.

Claims (11)

  A method for splitting an oriented wooden hot-pressed material, comprising: cutting the oriented wooden hot-pressed material at least 4 mm from the pressed surface and then dividing the oriented wooden hot-pressed material in the thickness direction.   2. The method according to claim 1, wherein the oriented wooden hot-press molding material is a molding material obtained by hot-pressing a laminate of elongated wooden material pieces with a binder oriented in the longitudinal direction.   3. The method according to claim 2, wherein the wooden piece is derived from thinned wood, edge material, waste pallet material or demolition waste material.   4. The method according to claim 2, wherein the wood piece has a weight ratio of 70% or more in a range of 1 to 11 mm in thickness and 20 to 150 mm in length.   5. The method according to claim 1, wherein the oriented wooden hot-press molded material has a specific gravity of 0.6 to 1.0.   The method according to claim 1, wherein the oriented wooden hot-press molded material has a thickness of 50 mm or more.   The method according to claim 1, wherein the oriented wooden hot-pressed material has a length of 1800 mm or more.   The method according to claim 1, wherein the hot pressing is performed by steam heating and pressurizing with a press.   The method according to claim 1, wherein the division is performed with an equal thickness.   The method according to claim 2, wherein the binder is an adhesive. The method according to claim 10, wherein the adhesive is an isocyanate adhesive and / or a tannin adhesive.