JP2008173808A - Manufacturing method for long composite particle board and long composite particle board - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a long composite particle board having dimensional stability, excellent in bending strength, having strong resistance against deflection and extremely reduced in deflection. <P>SOLUTION: The long composite particle board A is manufactured by a method wherein an undersurface wood chip layer 1b comprising a mixture of wood chips 2 and an adhesive 3 is laid on a lower press plate 7, a net material 4, wherein the number of long fibers 41 arranged in a length direction per a unit width is larger than that of short fibers 42 arranged in a width direction, is placed on the undersurface wood chip layer 1b, an upper surface wood chip layer 1a comprising the mixture of the wood chips 2 and the adhesive 3 is further laid on the net material 4 and all of them are pressed under heating by upper and lower press plates 6 and 7 to integrally laminate the net material 4 as an intermediate layer. The long composite particle board A is also disclosed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a composite particle board. More specifically, the present invention relates to a method for producing a long composite particle board and a long composite particle board obtained thereby.

  A board obtained by crushing scraps and various wastes discarded from a sawmill into wood chips, adding and mixing adhesives and other resin components to the wood chips, pressurizing and bonding under heating The body is used for various purposes from the viewpoint of resource protection and effective use of log logs. The board body is used, for example, as a material for building interior materials, furniture, and the like. In particular, a long board body is lightweight and has good workability, and is cheaper than a solid board or plywood. Although it is widely used, there are disadvantages in that the strength is inferior and the dimensional stability is not sufficient.

  In order to solve the above-mentioned strength problem, it is conceivable to increase the blending amount of the adhesive. In this case, although the strength increases, the density increases and becomes heavier and harder, so that the workability is inferior. Furthermore, the board body, in particular, a long board body, often bends in the length direction, and requires a rigidity in the length direction, that is, a material having a large bending strength at a substantially central portion in the length direction.

  In order to solve the above-mentioned problems, the following Patent Document 1 discloses a fiber board such as a particle board or a medium density fiber board made of plant-like pieces and an adhesive, in which a network structure that can be easily cut is arranged in a reinforcing layer. A fiberboard is proposed. The mesh structure is a net-like or lattice-like one formed of a synthetic resin or a natural material such as bamboo or wood, and a small piece of plant material and an adhesive are formed in the opening surrounded by the net or lattice. And the reinforcing layer is formed, and the strength of the fiberboard is improved.

In addition, the mesh structure is made of a synthetic resin or a woody material and can be easily cut, so that the strength is improved while maintaining the quality of the fiberboard which is light, homogeneous, workable and inexpensive. Therefore, the effect that it is suitable for being widely used for various uses as furniture, building materials, etc. is also described.
Japanese Patent Laid-Open No. 7-314413 (pages 1 to 3, FIGS. 1 and 2)

  However, since the fiberboard described in Patent Document 1 uses a net-like or lattice-like network structure formed of a synthetic resin or a natural material such as bamboo or wood as a reinforcing layer, it is structurally sufficient. It does not necessarily have strength, and in particular, there is a problem that it is inferior in bending rigidity and is easily bent. In addition, when the plant-like piece absorbs moisture and expands, and when it dries and shrinks, the network structure also changes in size in the same manner. Therefore, there is also a problem that it is difficult to keep the fiber board constant.

  The present invention solves such a problem, and is a long composite particle board that has sufficient dimensional stability, excellent bending strength, strong resistance to deflection, and extremely small deflection even when humidification and drying are repeated. It is an object of the present invention to provide a manufacturing method and a long composite particle board obtained by the method.

  In order to solve the above problems, the present invention takes the following technical means. That is, according to the first aspect of the present invention, there is provided a method for producing a long composite particle board, in which a lower surface wood chip layer made of a mixture of wood chips and an adhesive is laid on a lower press board, A net body in which the number of long fibers arranged in the length direction per unit width is larger than the number of short fibers arranged in the width direction is placed on the lower surface wood chip layer, and the net body An upper composite wood chip layer composed of a mixture of wood chips and an adhesive is laid on the top, and is heated and pressed by a lower press machine, and the net body is laminated and integrated as an intermediate layer. A manufacturing method is provided.

As the adhesive, a thermosetting resin is usually used. The thermosetting resin is cured by heating to adhere the wood chips to each other, and the wood chips are firmly adhered to the net body as an intermediate layer. Is done. Examples of the thermosetting resin include urethane, melamine, urea melamine, and phenol resins. Moreover, the heating temperature of an upper press board and a lower press board shall be 100-200 degreeC, and a heating pressure shall be 8-50 kg / cm < ² >, Preferably, it is 8-30 kg / cm < ² >.

  As the net body, a net body made of an inorganic fiber such as glass fiber, carbon fiber, metal fiber, rock fiber (rock wool, rock fiber) or the like is preferably used. Further, a lattice-like rectangular mesh is formed from the long fibers and short fibers of the net body, and the size thereof is, for example, approximately 5 mm × 30 mm, and the size of the wood chip enters the mesh. .

  In addition to the invention according to claim 1, the manufacturing method of the long composite particle board according to claim 2 is configured such that a plywood is placed on the lower press board, and a lower surface wood chip layer is laid on the plywood. The net body is placed on the lower surface wood chip layer, and the upper surface wood chip layer is further laid on the net body and is pressed under heating.

  According to the third aspect of the present invention, the lower surface wood chip layer made of a mixture of the wood chip and the adhesive is laid on the lower press board, and the lower surface wood chip layer is arranged in the length direction per unit width. A top body wood chip layer comprising a net body in which the number of long fibers provided is greater than the number of short fibers disposed in the width direction, and further comprising a mixture of wood chips and an adhesive on the net body. A long composite particle board is provided in which the above net body is laminated and integrated as an intermediate layer by heating and pressing with an upper and lower press machine under heating.

  The manufacturing method of the long composite particle board concerning the invention of Claim 1 is as above-mentioned, laying a lower surface wood chip layer on a lower press board, and length per unit width on this lower surface wood chip layer A net body in which the number of long fibers arranged in the direction is larger than the number of short fibers arranged in the width direction is placed, and an upper surface wood chip layer is laid on the net body and heated under heating. Since the fiber density in the length direction of the net body laminated and integrated as an intermediate layer is large, the bending rigidity in the length direction is improved, and a long composite particle board that is strong against bending is processed once. Thus, it can be manufactured efficiently.

  In addition to the effect of the method for producing a long composite particle board according to claim 1, the method for producing a long composite particle board according to claim 2 places a plywood on the lower press board, Laying the lower surface wood chip layer on the plywood, placing the net body on the lower surface wood chip layer, further laying the upper surface wood chip layer on the net body, pressurizing under heating Therefore, it is possible to efficiently produce a long composite particle board made of makeup that is useful in the fields of architectural interior materials and furniture that require design properties, such as a wood grain pattern on a plywood surface, in a single step. .

  The long composite particle board according to the third aspect of the present invention is as described above. The lower surface wood chip layer is laid on the lower press board, and is arranged in the length direction per unit width on the lower surface wood chip layer. A net body in which the number of long fibers to be provided is larger than the number of short fibers arranged in the width direction, an upper surface wood chip layer is laid on the net body, and the upper and lower presses are heated. Since it is pressed by a board and laminated and integrated with the net body, it includes a net body as an intermediate layer in which the fiber density of long fibers in the length direction is larger than the fiber density of short fibers arranged in the width direction. Thus, the long fiber receives the bending load, and the rigidity in the length direction is large. Therefore, since the rigidity in the length direction is improved, the amount of deflection can be made extremely small.

  Furthermore, it can be combined with plywood and veneer to give design to the surface, and the net body suppresses the dimensional change of woody materials such as plywood and wood chips even when humidification and drying are repeated. Excellent dimensional stability can be obtained. Therefore, it is possible to provide a long composite particle board that can be applied to various ranges such as interior materials for buildings such as flooring, furniture, and joinery.

  Hereinafter, an embodiment of a method for producing a long composite particle board according to the present invention will be described in detail with reference to the drawings. In this embodiment, a plywood is further combined with the long composite particle board. That is, as shown in FIG. 1, first, a long plywood 5 is placed on a lower press board 7 with its back surface 52 facing up and a wood grain surface 51 facing down, and a hopper or the like (not shown) The wood chips 2 stored on the plywood 5 are sprayed on the back surface 52 of the plywood 5, and then the adhesive 3 is sprayed onto the wood chips 2 by a known application means such as spraying.

  In this manner, as schematically shown in FIG. 2, the lower surface wood chip layer 1 b made of a mixture of the wood chips 2 and the adhesive 3 spread on the back surface 52 of the plywood 5 is formed on the entire surface of the back surface 52. Will be laid. In FIG. 2, the wood chip 2 and the adhesive 3 are partially enlarged. Furthermore, as shown in FIG. 2, the net body 4 is placed on the lower surface wood chip layer 1b. In the net body 4, the number of long fibers 41 arranged in the length direction per unit width is larger than the number of short fibers 42 arranged in the width direction. Next, an upper surface wood chip layer 1a made of the wood chip 2 and the adhesive 3 is laid on the net body 4 and pressed under heating.

FIG. 3 is a cross-sectional view schematically showing a state in which the upper surface wood chip layer 1a and the lower surface wood chip layer 1b are pressed under heating on the back surface 52 of the plywood 5 with the net body 4 as an intermediate layer. At this time, the heating temperature is 100 to 200 ° C., and the heating pressure is 8 to 50 kg / cm ² , preferably 8 to 30 kg / cm ² . And as shown by the white arrow in FIG. 3, the upper surface wood chip layer 1a and the lower surface wood chip layer 1b are respectively hot-pressed with the upper press board 6 and the lower press board 7 under the above conditions. Compressed to about 1/10 to form a wood chip molding layer.

  FIG. 4 schematically shows a long composite particle board A according to the present invention obtained by press-bonding a particle board comprising the net body 4 as an intermediate layer to the back surface 52 of the plywood 5 under heating in accordance with the above-described configuration. It is explanatory drawing shown in. In FIG. 4, the surface 51 of the plywood 5 is shown facing up. As shown in FIG. 4, the lower surface wood chip layer 1 b is compressed to form the lower surface wood chip molding layer 11 b and is firmly pressed against the back surface 52 of the plywood 5, and the upper surface wood chip layer 1 a also sandwiches the net body 4. To form the upper surface wood chip molding layer 11a and to be integrated with the lower surface wood chip molding layer 11b.

  In this way, by further combining the long composite particle board of the present invention with the plywood 5, the decorated long composite particle board A can be efficiently manufactured in one step. In the long composite particle board A, the number of long fibers 41 arranged in the length direction per unit width is larger than the number of short fibers 42 arranged in the width direction, that is, the fiber density of the long fibers 41. By including the net body 4 having a fiber density larger than the fiber density of the short fibers 42 as an intermediate layer, the bending rigidity in the length direction becomes stronger than the bending rigidity in the width direction, and the length in the length direction where a large bending load is applied. Even in the intermediate portion, the resistance to deflection increases, and the amount of deflection becomes extremely small.

  Moreover, even if humidification and drying are repeated, the net body 4 suppresses the dimensional change of the woody material such as the plywood 5, the lower surface wood chip molding layer 11b, the upper surface wood chip molding layer 11a, and has excellent dimensional stability. In addition, since the amount of deflection is extremely small as described above, it can also be used as a flooring material.

  In the above-described embodiment, an example in which three layers sandwiching the net body 4 as an intermediate layer has been described. However, the present invention is not limited to three layers, and the net body 4 has two layers, and the net body 4 has three layers. It is good also as a form which consists of five layers pinched | interposed with a wood chip molding layer. Thus, by making the net body 4 into two layers, the bending rigidity can be further increased. As described above, the present invention can be modified in various ways, and by implementing the present invention, in addition to the above flooring material, it is a long composite that can be applied to various ranges such as architectural interior materials, furniture, and fittings. A particle board can be provided.

It is explanatory drawing which shows typically the first process of the manufacturing method of the elongate composite particle board of this invention. It is explanatory drawing which shows typically the intermediate | middle process of the manufacturing method of the elongate composite particle board of this invention. In the manufacturing method of the elongate composite particle board of this invention, it is sectional drawing which shows typically the process pressurized under heating. It is explanatory drawing which shows typically the long composite particle board which the makeup | decoration of this invention was made.

Explanation of symbols

A Long composite particle board 1a according to the present invention Upper surface wood chip layer 11a Upper surface wood chip molding layer 1b Lower surface wood chip layer 11b Lower surface wood chip molding layer 2 Wood chip 3 Adhesive 4 Net body 41 Long fiber 42 Short fiber 5 Plywood 51 Front surface 52 Back surface 6 Upper press panel 7 Lower press panel

Claims (3)

  A method of manufacturing a long composite particle board, wherein a lower wood chip layer made of a mixture of wood chips and an adhesive is laid on a lower press board, and a length per unit width is formed on the lower wood chip layer. A net body in which the number of long fibers arranged in the direction is larger than the number of short fibers arranged in the width direction, and an upper surface made of a mixture of wood chips and an adhesive on the net body A method for producing a long composite particle board in which a wood chip layer is laid, heated and heated by an upper and lower press machine, and the net body is laminated and integrated as an intermediate layer.   A plywood is placed on the lower press board, the lower surface wood chip layer is laid on the plywood, the net body is placed on the lower surface wood chip layer, and the upper surface is further placed on the net body. The method for producing a composite particle board according to claim 1, wherein a wood chip layer is laid and pressurized under heating.   A lower wood chip layer made of a mixture of wood chips and an adhesive is laid on the lower press board, and the number of long fibers arranged in the length direction per unit width on the lower wood chip layer is the width direction. A net body larger than the number of short fibers disposed on the net body is placed, and an upper surface wood chip layer made of a mixture of wood chips and an adhesive is laid on the net body, and the upper and lower presses are heated. A long composite particle board that is pressed by a board and laminated and integrated with the net body as an intermediate layer.

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