JP2012236386A - Laminated lumber and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laminated lumber that can secure the rigidity while making the best use of the characteristic of the carbon fiber-reinforced resin and the method of manufacturing the same.SOLUTION: In the laminated lumber 1, the compressive stress is caused in the cedar material 2 when the external force is received, and the tensile stress is caused in carbon fiber-reinforced resin 4. Here the carbon fiber-reinforced resin 4 has an excellent characteristic in the tensile strength, and the cedar material 2 has the given compressive strength. Therefore, the rigidity to the external force is secured. Moreover, since the carbon fiber-reinforced resin 4 contributes to the tensile stress, the characteristic of the carbon fiber-reinforced resin 4 is fully utilized. In addition, the laminated lumber is excellent in the appearance, touch, and the smell, since the cedar material 2 makes the surface layer, and weight saving may be attained to the extent that the foaming material 3 is used.

Description

  The present invention relates to a laminated material using wood and carbon fiber reinforced resin and a method for producing the same.

  Conventionally, as described in Patent Document 1 below, as a technique in such a field, a rectangular column shape in which a carbon fiber reinforced resin is wound around the outer periphery of a core material made of wood and wood is attached to the surface of the carbon fiber resin. Laminated lumber is known. In this laminated material, a plurality of woods are laminated to form a core material, and the fiber directions in the plurality of woods are parallel. Further, carbon fiber resin fibers are arranged in a direction substantially perpendicular to or intersecting with the direction of the fibers of the wood.

  With such a configuration, the laminated material described in Patent Document 1 below is highly rigid and lightweight, and can be applied as a structural material for large buildings. In addition, the amount of natural wood used is reduced by the use of carbon fiber resin.

JP-A-6-122105

  In the conventional laminated material described above, rigidity is ensured by both the core material in which wood is laminated and the carbon fiber reinforced resin. That is, the carbon fiber reinforced resin is used only as an auxiliary to ensure rigidity. Thus, with the conventional laminated material, the characteristics of the carbon fiber reinforced resin could not be fully utilized.

  An object of this invention is to provide the laminated material which can ensure rigidity, fully utilizing the characteristic of carbon fiber reinforced resin, and its manufacturing method.

  The laminated material according to the present invention is a laminated material in which a plurality of members are laminated, and is formed of wood and is formed of a first member forming a surface layer and a carbon fiber reinforced resin, and the back surface side of the first member. A second member disposed on the first member and a third member formed of a foam and joined to the second member, and when subjected to external force, the first member is subjected to compressive stress, A tensile stress is generated in the second member.

  According to this laminated material, when an external force is applied, compressive stress is generated in the first member formed of wood, and tensile stress is generated in the second member formed of carbon fiber reinforced resin. Here, the carbon fiber reinforced resin has excellent properties in tensile strength. Wood also has a predetermined compressive strength. Therefore, rigidity against external force can be ensured. Moreover, since the second member made of the carbon fiber reinforced resin contributes to the tensile stress, the characteristics of the carbon fiber reinforced resin are fully utilized. Further, the weight can be reduced by using the third member formed of the foam. Moreover, since the 1st member formed with wood makes a surface layer, it is excellent in appearance, touch, and smell. The exposed first member also has a function of absorbing humidity in the atmosphere in which the laminated material is disposed.

  The first to third members have a plate shape, the third member is disposed between the first member and the second member, and the first member and the second member are the surface side of the third member and It is preferable to be joined to the back side. In this case, the 3rd member formed from the foam is sandwiched by the 1st member and the 2nd member, and a plate-shaped laminated material is formed. Thereby, for example, a highly rigid and lightweight plate-like member suitable for a flooring material or a furniture material of a building is realized.

  In addition, it is preferable that the third member has a columnar shape, the second member is joined to the outer peripheral side of the third member, and the first member is joined to the outer peripheral side of the second member. In this case, a columnar laminated material having a columnar third member formed from a foam as a core material is formed. Thereby, for example, a highly rigid and lightweight columnar member suitable for a column member or a handrail of a building is realized.

  Moreover, the manufacturing method of the laminated material which concerns on this invention is a manufacturing method of said laminated material, Comprising: The process which apply | coats room temperature hardening type resin to a 3rd member, and the carbon which comprises a 2nd member to a 3rd member And a step of pasting the fiber and a step of pressing the carbon fiber toward the third member and curing the room temperature curable resin to form the second member.

  According to this manufacturing method, the second member is formed by attaching the carbon fiber to the third member to which the room temperature curable resin is applied, and the room temperature curable resin is cured, and the second member becomes the third member. Be joined. Therefore, a heating furnace is not necessary, and a mold for molding the carbon fiber reinforced resin is not necessary. Moreover, since the 2nd member is joined at normal temperature, the thermal expansion of the timber which can occur when it heats can be prevented. Further, since the room temperature curable resin serves as the matrix resin of the second member and the resin for joining the second member to the third member, the manufacturing cost can be reduced.

  According to the present invention, rigidity can be ensured while fully utilizing the characteristics of the carbon fiber reinforced resin.

It is a perspective view which shows 1st Embodiment of the laminated material which concerns on this invention. It is explanatory drawing of the stress which arises when external force acts on the laminated material of FIG. (A) And (b) is a perspective view which shows the manufacture procedure of the laminated material of FIG. (A) And (b) is a perspective view which shows the manufacturing procedure following FIG. (A) And (b) is a perspective view which shows the manufacturing procedure following FIG. (A) And (b) is a perspective view which shows the manufacturing procedure following FIG. It is a perspective view which shows 2nd Embodiment of the laminated material which concerns on this invention. (A) And (b) is a perspective view which shows the manufacture procedure of the laminated material of FIG. (A) And (b) is a perspective view which shows the manufacturing procedure following FIG. (A) And (b) is a perspective view which shows the manufacturing procedure following FIG. (A) And (b) is a perspective view which shows the manufacture procedure following FIG. It is a perspective view which shows 3rd Embodiment of the laminated material which concerns on this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant descriptions are omitted.

  As shown in FIG. 1, the laminated material 1 is a plate material having a three-layer structure in which a plurality of members 2 to 4 are laminated. The laminated material 1 is lightweight and highly rigid, and is used, for example, as a flooring material or a furniture material of a building. In the state where the laminated wood 1 is used in a building or furniture, the cedar wood (first member) 2 is exposed to the outside. The laminated material 1 has an excellent appearance due to the surface of such a grain.

  The laminated material 1 was joined to the plate-like cedar material 2 forming the surface layer, the plate-like foam material (third member) 3 joined to the back surface side of the cedar material 2, and the back surface side of the foam material 3. Plate-like carbon fiber reinforced resin (second member) 4. In other words, the foam material 3 is disposed between the cedar material 2 and the carbon fiber reinforced resin 4, and the cedar material 2 and the carbon fiber reinforced resin 4 are respectively joined to the front surface side and the back surface side of the foam material 3. .

  As described above, the laminated material 1 has a structure in which the foam material 3 is sandwiched between the cedar material 2 and the carbon fiber reinforced resin 4. The cedar material 2, the foam material 3, and the carbon fiber reinforced resin 4 have a rectangular parallelepiped shape having the same size. The cedar material 2 and the foam material 3, and the foam material 3 and the carbon fiber reinforced resin 4 are bonded to each other via a room-temperature curable resin. This room temperature curable resin also serves as the matrix resin of the carbon fiber reinforced resin 4. As the room temperature curable resin, for example, an epoxy resin, a polyester resin, a vinyl ester resin, or the like can be used.

  The cedar material 2 constitutes the outermost layer. The cedar material 2 is not particularly limited, but for example, Tenryu cedar is suitable. The thickness of the cedar material 2 is, for example, about 5 to 20 mm. In addition, as a timber which forms a 1st member, it is not restricted to cedar material, For example, you may use a timber material, a pine material, etc.

  The foam material 3 is formed of a foam. For example, polyurethane foam or polystyrene foam can be used as the foam material 3. The thickness of the foam material 3 is, for example, about 5 mm. As the foam material 3, any material may be used as long as it is lightweight and has a predetermined moldability. The foam material 3 preferably has heat resistance.

  Carbon fiber reinforced resin (CFRP) 4 is obtained by impregnating a matrix resin into a sheet-like carbon fiber and curing it. As described above, the matrix resin of the carbon fiber reinforced resin 4 is a room temperature curable resin, and also has a function of joining the carbon fiber reinforced resin 4 to the foamed material 3. The carbon fiber reinforced resin 4 is formed by laminating, for example, 1 to 8 CFPR sheets. The thickness of the carbon fiber reinforced resin 4 is, for example, about 0.25 to 2 mm. The carbon fibers constituting each CFPR sheet are so-called plain weave materials in which the directions of the fibers are crossed. In addition, depending on the place where the laminated material 1 is used, a UD (Uni-Directional) material in which fibers are arranged in one direction can be used. When using a UD material, a fiber is arrange | positioned in the direction where high tensile strength is calculated | required.

  FIG. 2 is an explanatory diagram of the stress generated when an external force is applied to the laminated material 1. As shown in FIG. 2, when an external force is applied from the front surface side (cedar material 2 side) to the back surface side (carbon fiber reinforced resin 4 side) of the laminated wood 1, compressive stress is generated in the cedar material 2 and carbon Tensile stress is generated in the fiber reinforced resin 4. Since the carbon fiber reinforced resin 4 is excellent in tensile strength, the laminated material 1 has very high rigidity against this external force. According to the laminated material 1, the maximum bending stress is greatly improved as compared with the conventional plate material.

  Then, the manufacturing method of the laminated material 1 is demonstrated. 3-6 is a perspective view which shows the manufacture procedure of the laminated material 1. FIG. First, as shown in FIG. 3A, a cedar material 2 is prepared. Next, as shown in FIG. 3B, a room temperature curing type epoxy resin is applied to the bonding surface of the cedar material 2, that is, the back surface bonded to the foam material 3.

  Next, as shown in FIG. 4A, a room temperature curing type epoxy resin is also applied to the surface of the foam material 3. Further, as shown in FIG. 4B, the foam material 3 is bonded to the cedar material 2 so that the back surface of the cedar material 2 and the surface of the foam material 3 are matched.

  Next, as shown in FIG. 5A, a room temperature curing type epoxy resin is applied to the back surface of the foam material 3. Next, as shown in FIG. 5B, the carbon fiber 6 is bonded to the back surface of the foam material 3.

  Next, as shown to Fig.6 (a), warm air is sprayed on the carbon fiber 6 using a dryer etc., and defoaming is performed using the roller 7, heating the carbon fiber 6 at 60-80 degreeC. At this time, the clay of the epoxy resin is lowered and the epoxy resin soaks into the voids of the carbon fibers 6 so that the epoxy fibers are impregnated into the carbon fibers 6 as a matrix resin. Next, as shown in FIG. 6B, the carbon fiber 6 is pressed toward the foam material 3. And carbon resin reinforced resin 4 is formed after hardening of resin, and the laminated material 1 shown in FIG. 1 is shape | molded. The curing temperature and curing time of the resin are 24 hours at 25 ° C., for example. In addition, it is good also as 15 hours at 30 degreeC.

  According to the laminated material 1 described above, when an external force is applied, compressive stress is generated in the cedar material 2 and tensile stress is generated in the carbon fiber reinforced resin 4 (see FIG. 2). Here, the carbon fiber reinforced resin 4 has a characteristic excellent in tensile strength, and the cedar material 2 also has a predetermined compressive strength. Therefore, rigidity against external force is ensured. Moreover, since the carbon fiber reinforced resin 4 contributes to the tensile stress, the characteristics of the carbon fiber reinforced resin 4 are fully utilized. Furthermore, weight reduction is achieved by using the foam material 3. Moreover, since the cedar material 2 forms a surface layer, it is excellent in appearance, touch and smell. Since the carbon fiber reinforced resin 4 is hidden behind the cedar material 2 and cannot be seen, the carbon fiber reinforced resin 4 does not affect the appearance. The exposed cedar material 2 also has a function of absorbing humidity in the atmosphere in which the laminated material 1 is disposed.

  In addition, since the foam material 3 is sandwiched between the cedar material 2 and the carbon fiber reinforced resin 4 to form a plate-shaped laminated material 1, for example, a highly rigid and lightweight board suitable for a flooring material or a furniture material of a building. A shaped member is realized.

  Moreover, according to the manufacturing method of the laminated material 1 mentioned above, the carbon fiber 6 is stuck on the foam material 3 to which the room temperature curable resin is applied, and the carbon fiber reinforced resin 4 is formed by curing the room temperature curable resin. In addition, the carbon fiber reinforced resin 4 is joined to the foam material 3. Therefore, a heating furnace is not necessary, and a mold for molding the carbon fiber reinforced resin 4 is not necessary. Moreover, since the carbon fiber reinforced resin 4 is joined at normal temperature, the thermal expansion of the cedar material 2 that may occur when heated can be prevented. Further, since the room temperature curable resin serves as both the matrix resin of the carbon fiber reinforced resin 4 and the resin for joining the carbon fiber reinforced resin 4 to the foamed material 3, the manufacturing cost is reduced.

  Even if the cedar material 2 is thermally expanded, according to the laminated material 1 and the manufacturing method thereof, the cedar material 2 is interposed between the cedar material 2 and the carbon fiber reinforced resin 4, so that the cedar material 2 Deviation and peeling of the material 2 can be prevented. When the cedar material 2 and the carbon fiber reinforced resin 4 are directly bonded, the carbon fiber reinforced resin 4 may be peeled off from the cedar material 2 due to the deformation of the cedar material 2, but in the laminated material 1 and the manufacturing method thereof, Such a situation is prevented.

  FIG. 7 is a perspective view showing a second embodiment of the laminated material. This laminated material 10 includes a prismatic foam material (third member) 13 as a core material, a rectangular tube-shaped carbon fiber reinforced resin (second member) 14 joined to the outer peripheral side of the foam material 13, and It has a square cylindrical cedar material (first member) 12 joined to the outer peripheral side of the carbon fiber reinforced resin 14. That is, the laminated material 10 is a pillar material having a three-layer structure. The carbon fiber reinforced resin 14 is formed by winding one to several carbon fibers around the outer peripheral surface of the foam material 13. Moreover, the cedar material 12 is formed by attaching four cedar materials to four surfaces of carbon fibers. The foamed material 13 and the carbon fiber reinforced resin 14, and the carbon fiber reinforced resin 14 and the cedar material 12 are bonded to each other through a room temperature curing type epoxy resin, as in the laminated material 1.

  8 to 11 are perspective views showing the manufacturing procedure of the laminated material 10. First, as shown in FIG. 8A, a foam material 13 is prepared. Here, the corners of the foam material 13 are chamfered at C5 to C10. Next, as shown in FIG. 8 (b), a room temperature curing type epoxy resin is applied to the outer peripheral surface of the foam material 13.

  Next, as shown in FIG. 9A, one to several carbon fibers 16 are wound around and pasted on the outer peripheral surface of the foam material 13. Further, as shown in FIG. 9B, a room temperature curing type epoxy resin is applied to the surface of the carbon fiber 16.

  Next, as shown in FIG. 10A, warm air is blown onto the carbon fibers 16 using a dryer or the like, and the carbon fibers 16 are heated to 60 to 80 ° C. and defoamed using the rollers 7. At this time, the clay of the epoxy resin is lowered and the epoxy resin soaks into the gaps of the carbon fibers 16, so that the epoxy resin is impregnated into the carbon fibers 16 as a matrix resin. Next, as shown in FIG. 10 (b), a plate-like cedar material 12 is prepared, and a room temperature curing type epoxy resin is applied to the bonding surface of the cedar material 12, that is, the back surface bonded to the carbon fiber 16. To do.

  Next, as shown in FIG. 11 (a), four cedar members 12 are sequentially attached to the surface of the carbon fiber 16. Next, as shown in FIG. 11 (b), pressure is applied from the surface side of the cedar material 12 using the clamp 8 or the like, and the cedar material 12 and the carbon fibers 16 are pressed toward the foam material 13. And after hardening of resin, the carbon fiber reinforced resin 14 is formed and the laminated material 10 shown in FIG. 7 is shape | molded. The curing temperature and curing time of the resin are 24 hours at 25 ° C., for example. In addition, it is good also as 15 hours at 30 degreeC.

  According to this laminated material 10, when external force is received, while compressive stress arises in cedar material 12, tensile stress arises in carbon fiber reinforced resin 14, and the effect | action similar to the laminated material 1 of 1st Embodiment is produced. An effect can be obtained. Further, by forming a columnar laminated material having the foam material 13 as a core material, a highly rigid and lightweight prismatic member suitable for a columnar material of a building, for example, is realized.

  FIG. 12 is a perspective view showing a third embodiment of the laminated material. The laminated material 20 includes a cylindrical foam material (third member) 23 as a core material, a cylindrical carbon fiber reinforced resin (second member) 24 bonded to the outer peripheral side of the foam material 23, carbon It has a cylindrical cedar material (first member) 22 joined to the outer peripheral side of the fiber reinforced resin 24. That is, the laminated material 20 is a bar material having a three-layer structure. The foam material 23 and the carbon fiber reinforced resin 24, and the carbon fiber reinforced resin 24 and the cedar material 22 are bonded to each other through a room temperature curing type epoxy resin, like the laminated material 1.

  Also with such a laminated material 20, the same effect as the laminated materials 1 and 10 can be obtained. In addition, for example, a highly rigid and lightweight columnar member suitable for a handrail of a building is realized.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment. For example, you may cover not only the surface side of the laminated material 1 but the back surface side with cedar. In this case, since the carbon fiber reinforced resin on the back side is covered with the cedar without being exposed, the appearance on the back side is also improved.

  DESCRIPTION OF SYMBOLS 1 ... Glued material, 2 ... Cedar material (1st member), 3 ... Foam material (3rd member), 4 ... Carbon fiber reinforced resin (2nd member), 6 ... Carbon fiber, 10,20 ... Glued material, 12 , 22 ... Cedar (first member), 13, 23 ... Foam (third member), 14, 24 ... Carbon fiber reinforced resin (second member), 16 ... Carbon fiber.

Claims (4)

A laminated material in which a plurality of members are laminated,
A first member made of wood and forming a surface layer;
A second member formed of carbon fiber reinforced resin and disposed on the back side of the first member;
A third member formed of foam and joined to the second member;
A laminated lumber characterized in that when an external force is applied, compressive stress is generated in the first member and tensile stress is generated in the second member. The first to third members have a plate shape,
The third member is disposed between the first member and the second member;
The laminated material according to claim 1, wherein the first member and the second member are respectively joined to a front surface side and a back surface side of the third member. The third member has a columnar shape,
The laminated material according to claim 1, wherein the second member is bonded to the outer peripheral side of the third member, and the first member is bonded to the outer peripheral side of the second member. It is a manufacturing method of the laminated material as described in any one of Claims 1-3,
Applying a room temperature curable resin to the third member;
A step of attaching a carbon fiber constituting the second member to the third member;
And pressing the carbon fiber toward the third member and curing the room temperature curable resin to form the second member.