JP7218043B2 - honeycomb laminate - Google Patents

Description

TECHNICAL FIELD The present invention relates to a honeycomb laminate in which surface materials impregnated and cured with a thermosetting resin are laminated on both surfaces of a honeycomb core, and a manufacturing method thereof.

A honeycomb laminate, in which surface materials impregnated with a thermosetting resin and hardened are laminated on both sides of a honeycomb core, is used in fields such as aircraft, automobiles, and construction because of its light weight and high rigidity.

In manufacturing a honeycomb laminate, prepreg impregnated with a thermosetting resin is arranged on both sides of a honeycomb core, and the thermosetting resin of the prepreg is cured to form a surface material, and a surface material (prepreg) and honeycomb are formed. There is a cocuring molding that simultaneously adheres to the core.

In addition, the honeycomb laminate adheres to the surface material (prepreg) at the end of the wall of the honeycomb core by the thermosetting resin of the prepreg, and the surface material is adhered to the inner portion (hollow portion) of the cells surrounded by the wall of the honeycomb core. Therefore, in order to increase the bonding strength between the honeycomb core and the surface material, it is important to form a good fillet between the wall of the honeycomb core and the surface material. The fillet is formed by rising a thermosetting resin from the surface material (prepreg) so as to sandwich the end of the wall of the honeycomb core.

As a method for forming a good fillet, it has been proposed to use an epoxy resin composition with adjusted viscosity as the thermosetting resin of the prepreg (Patent Document 1).

Japanese Patent No. 4639899

However, in the method of forming fillets by using a viscosity-adjusted epoxy resin composition as the thermosetting resin of the prepreg, the fillets protruding from the surface material only sandwich the ends of the walls of the honeycomb core. and the bonding strength with the honeycomb core was not high.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a honeycomb laminate in which the bonding strength between the surface material and the honeycomb core is high and the surface material is difficult to separate from the honeycomb core, and a method for manufacturing the same.

A first aspect of the present invention provides a honeycomb laminate in which surface materials are laminated on both sides of a honeycomb core, wherein the surface materials are carbon fiber fabrics, unidirectional carbon fiber sheets, or composite laminates of these, which are porous. A member for surface material in which porous sheets are laminated is impregnated with a thermosetting resin and hardened. At the contact position with the honeycomb core, the honeycomb core bites into the porous sheet and the thermosetting resin exuded from the porous sheet is cured.

A second aspect of the invention is characterized in that in the first aspect of the invention, the porous sheet has a thickness of 0.5 to 2 mm.

According to a third aspect of the invention, in the first or second aspect of the invention, the porous sheet is made of foam or nonwoven fabric.

A fourth aspect of the invention is characterized in that, in the third aspect of the invention, the foam has a density of 5 to 100 kg/m ³ and the nonwoven fabric has a basis weight of 2 to 200 g/m ² .

A fifth aspect of the invention is the honeycomb core according to any one of the first to fourth aspects , wherein the honeycomb core has a cell size of 1/32 to 1/1 inch.

A sixth aspect of the invention is a method for manufacturing a honeycomb laminate in which surface materials are laminated on both sides of a honeycomb core, wherein the surface materials are carbon fiber fabrics, unidirectional carbon fiber sheets, or composite laminates thereof. A surface material member in which a porous sheet is laminated on a material is impregnated with a thermosetting resin and cured, and an impregnation step of impregnating the surface material member with the thermosetting resin; a stacking step of obtaining a laminate for compressive heating by arranging the surface member impregnated with the thermosetting resin so that the porous sheet is in contact with the honeycomb core; By heating, the honeycomb core is bitten into the porous sheet, the thermosetting resin is exuded from the porous sheet at the biting portion, and the exuded thermosetting resin and the surface material member are formed. and a compression heating step of curing the thermosetting resin inside to integrate the surface material and the honeycomb core.

A seventh aspect of the invention is characterized in that in the sixth aspect of the invention, the porous sheet has a thickness of 0.5 to 2 mm.

According to an eighth aspect of the invention, in the sixth or seventh aspect of the invention, the porous sheet is made of foam or nonwoven fabric.

A ninth aspect of the invention is characterized in that, in the eighth aspect of the invention, the foam has a density of 5 to 100 kg/m ³ and the nonwoven fabric has a basis weight of 2 to 200 g/m ² .

A tenth aspect of the invention is the honeycomb core according to any one of the sixth to ninth aspects , wherein the honeycomb core has a cell size of 1/32 to 1/1 inch.

According to the present invention, the surface materials on both sides of the honeycomb core are thermosetting members for surface materials in which a porous sheet is laminated on a carbon fiber fabric, a unidirectional carbon fiber sheet, or a composite laminate thereof. It is assumed that the resin is impregnated and cured, and the honeycomb core bites into the porous sheet of the surface material, and the thermosetting resin exuded from the porous sheet is cured, so the bonding strength between the honeycomb core and the surface material is good. Become.

Furthermore, when the honeycomb laminate is manufactured, the honeycomb core bites into the porous sheet, compressing the porous sheet at that portion and exuding the thermosetting resin. It hardens in a raised state along the wall that has bitten into it, forming a good fillet. In addition, the manufactured honeycomb laminate has the effect of increasing the adhesive strength obtained by the honeycomb core biting into the porous sheet of the surface material, and the adhesive strength increasing effect obtained by the fillet, so that the honeycomb core and the Adhesion to the surface material becomes strong (the peel strength of the surface material is large).

1 is a partially cutaway plan view of an embodiment of a honeycomb laminate according to the present invention. FIG. FIG. 2 is a cross-sectional view taken along line 2-2 of FIG. 1; It is a figure which shows the impregnation process in one Embodiment of the manufacturing method of this invention. It is a figure which shows the lamination process in one Embodiment of the manufacturing method of this invention. It is a figure which shows the heating compression process in one Embodiment of the manufacturing method of this invention. 4 is a table showing configurations and evaluations of examples and comparative examples.

A honeycomb laminate and a method for manufacturing the same according to the present invention will be described below with reference to the drawings.
A honeycomb laminate 10 according to an embodiment of the present invention shown in FIGS. 1 and 2 includes a honeycomb core 11 and surface materials 21 laminated and integrated on both surfaces of the honeycomb core 11. The honeycomb core 11 and the surface materials 21 (peel strength of the surface material) is high.

Honeycomb core 11 has a plurality of cells 15 partitioned by walls 13 . In the honeycomb core 11, the plane shape of the cells 15 is hexagonal (honeycomb) as in the present embodiment, and there are other types such as quadrangular, triangular, pentagonal, octagonal, fluted (corrugated), and circular. , but not limited to. From the viewpoint of the strength of the honeycomb core 11 and ease of manufacture, it is preferable that the planar shape of the cells is hexagonal.

Examples of the material of the honeycomb core 11 include paper, metal, resin, ceramic, aramid fiber sheet, etc. Among them, aluminum (aluminum honeycomb core) is particularly preferable due to its excellent lightness and nonflammability. If the cell size (opening) d of the honeycomb core 11 is too small, the weight of the honeycomb core 11 increases and the honeycomb laminate 10 becomes heavy. A range of 1/32 to 1/1 inch is preferred, and 1/32 to 1/2 inch is more preferred, as it accounts for 21 dimples. Moreover, if the height (thickness) of the honeycomb core 11 is too low, the honeycomb core 11 will be heavy relative to its bulk, and if it is too high, the strength of the honeycomb core 11 will decrease.

The surface material 21 is formed by impregnating a surface material member 27 with a porous sheet 25 laminated on a carbon fiber fabric, a unidirectional carbon fiber sheet, or a composite laminate 23 thereof, and hardening it with a thermosetting resin. Become.
The thickness of the surface material 21 is preferably 0.2 to 3.0 mm on each side in order to prevent natural deformation such as dents and for lightness.

The carbon fiber fabric, the unidirectional carbon fiber sheet, or a composite laminate thereof 23 is not limited to one layer on each side of the honeycomb core 11, and may be composed of a laminate of multiple layers (multiple layers).
The carbon fiber fabric, the unidirectional carbon fiber sheet, or a composite laminate thereof 23 is excellent in light weight and high rigidity. Carbon fiber fabrics, unidirectional carbon fiber sheets, or composite laminates thereof are particularly preferably those with a weaving method (fabric) in which the fibers are not unidirectional, for example, a plain weave composed of warp and weft. , twill weave, satin weave and triaxial weave composed of yarns in three directions are suitable. In addition, the carbon fiber fabric, unidirectional carbon fiber sheet, or composite laminate thereof 23 preferably has a fiber weight of 90 to 400 g/m ² from the viewpoint of thermosetting resin impregnation and rigidity. .

The porous sheet 25 is made of foam or non-woven fabric, and the honeycomb core 11 is in contact with the porous sheet 25 at the contact position.
If the thickness of the porous sheet is too thin, the honeycomb core 11 cannot bite into it. On the other hand, if it is too thick, it becomes heavy, and the thermosetting resin does not sufficiently seep into the honeycomb core 11, so that the increase in adhesive strength is not effective.

As the foam, a foam having an open-cell structure is preferable in order to allow impregnation of the thermosetting resin, and examples thereof include a urethane resin foam and a melamine resin foam. In addition, since the melamine resin foam has good flame retardancy, it is suitable when the honeycomb laminate 10 is required to have flame retardancy. If the density of the foam (JIS K 7222) is too low ^, the impregnation and retention of the thermosetting resin will be poor. It is preferably 20-80 kg/m ³ .

Nonwoven fabrics include carbon fiber nonwoven fabrics, glass nonwoven fabrics, nylon nonwoven fabrics, PET nonwoven fabrics, and the like. On the other hand, if the basis weight of the nonwoven fabric is too small, the impregnating property and holding property will deteriorate, while if it is too large, the honeycomb core will not be able to ^penetrate into it.

Further, as shown in FIG. 2, at the position where the honeycomb core 11 is biting into the porous sheet 25, the porous sheet 25 is compressed and the thermosetting resin exudes. The honeycomb core 11 rises along the wall 13 that has bitten into it, and hardens in a state where the end of the wall 13 is sandwiched to form a fillet 17 .

The thermosetting resin is not particularly limited, but in order to increase the rigidity of the honeycomb laminate 10, the thermosetting resin itself needs to have a certain degree of rigidity. It can be selected from the group consisting of mixtures and urethane resins. When the honeycomb laminate 10 is required to be flame retardant, the thermosetting resin is preferably flame retardant. Phenolic resins are preferred because they have good flame retardancy. The impregnation amount of the thermosetting resin is preferably 50 to 80% by weight with respect to the member for surface material after impregnation.

The integration of the honeycomb core 11 and the surface material 21 is achieved when the thermosetting resin impregnated in the surface material member 27 exudes from the porous sheet 25 and comes into contact with the honeycomb core 11 when the honeycomb laminate 10 is manufactured. Further, the fillet 17 is formed and cured.

Next, a method for manufacturing the honeycomb laminate 10 of the present invention will be described.
The method for manufacturing the honeycomb laminate 10 of the invention includes an impregnation step, a lamination step, and a compression heating step.
In the impregnation step, the impregnated surface material member is impregnated with a thermosetting resin into a surface material member in which a porous sheet is laminated on a carbon fiber fabric, a unidirectional carbon fiber sheet, or a composite laminate thereof. to make. An example of the impregnation process is shown below.
In the example of FIG. 3, first, as shown in (3-1) of FIG. An impregnated carbon fiber fabric, a unidirectional carbon fiber sheet, or a composite laminate thereof 23B is formed. The carbon fiber fabric, the unidirectional carbon fiber sheet, or a composite laminate thereof 23A and the thermosetting resin F are the carbon fiber fabric, the unidirectional carbon fiber sheet, or a composite of them described in the honeycomb laminate 10. It is the same as that laminated with a thermosetting resin. The thermosetting resin F used for impregnation is an uncured liquid.

Next, as shown in (3-2) of FIG. 3, a porous sheet 25A is laminated on one side of an impregnated carbon fiber fabric, a unidirectional carbon fiber sheet, or a composite laminate thereof 23B, and the impregnated 27 A of members for surface materials are formed. At that time, the tackiness (adhesiveness) of the thermosetting resin adhering to the surface of the impregnated carbon fiber fabric, the unidirectional carbon fiber sheet, or a composite laminate thereof 23B causes the porous sheet 25A to be removed. It can be attached to one side of the impregnated carbon fiber fabric, unidirectional carbon fiber sheet, or composite laminate thereof 23B. The porous sheet 25A laminated on the impregnated carbon fiber fabric, the unidirectional carbon fiber sheet, or a composite laminate thereof 23B is the impregnated carbon fiber fabric, the unidirectional carbon fiber sheet, or the porous sheet 25A that is in contact with the porous sheet 25A. The thermosetting resin adhering to the surface of the laminate 23B of them is impregnated. The porous sheet 25A is the same as the porous sheet described for the honeycomb laminate 10 described above.

The thermosetting resin F is preferably dissolved in a solvent to facilitate impregnation. After impregnation, the impregnated surface member 27A is dried at a low temperature at which the thermosetting resin F does not undergo a curing reaction. This removes the solvent.

The impregnation means is a method of immersing the carbon fiber fabric, a unidirectional carbon fiber sheet or a composite laminate 23A of them in a tank containing a liquid thermosetting resin F, a method of spraying, and a method of using a roll coater. etc., can be carried out by an appropriate method.

When the surface material 21 of the honeycomb laminate 10 includes a carbon fiber fabric, a unidirectional carbon fiber sheet, or a composite laminate 23 thereof, the impregnated carbon fiber fabric or the unidirectional carbon fiber The impregnated surface material member 27A is formed by laminating a plurality of sheets 23B or a composite laminate thereof 23B and then laminating the porous sheet 25A.

In the impregnation step, the carbon fiber fabric, the unidirectional carbon fiber sheet, or a composite laminate thereof 23A and the porous sheet 25A are each impregnated with the thermosetting resin F and then laminated to obtain the impregnated surface. It is good also as 27 A of members for materials. In addition, a porous sheet 25A is laminated in advance on a carbon fiber fabric, a unidirectional carbon fiber sheet, or a composite laminate thereof 23A to prepare a surface material member before impregnation, and the surface material member is heated. The impregnated surface member 27A may be impregnated with a curable resin.

In the lamination step, as shown in FIG. 4, impregnated surface material members 27A are arranged on both surfaces of a honeycomb core 11A to obtain a compression heating laminate 10A. At that time, the impregnated surface material member 27A is arranged such that the porous sheet 25A faces inside and the porous sheet 25A and the honeycomb core 11A are in contact with each other. The honeycomb core 11A is as described in the honeycomb laminated body 10 described above. In the lamination operation, the impregnated surface material member 27A, the honeycomb core 11A, and the impregnated surface material member 27A are stacked in this order on the upper surface of the press molding lower mold 31 used in the next compression heating step (FIG. 5). you can go The impregnated surface material member 27A and the honeycomb core 11A preferably have the same planar size.

In the compression/heating process, as shown in FIG. 5, the compression/heating laminate 10A is compressed and heated by a lower mold 31 and an upper mold 33 for press molding. A honeycomb laminate was actually manufactured by changing the distance between the press-molding lower mold 31 and the upper mold 33 in advance, and the thickness of the surface material in the obtained honeycomb laminate was measured to determine the desired surface material. A gap between the press-molding lower die 31 and the upper die 33, which will be the thickness, is found. During the compression heating step, a spacer is installed at an appropriate position between the press-molding lower mold 31 and the upper mold 33 so that the press-molding lower mold 31 and the upper mold 33 are spaced at a predetermined distance. In addition, although the method of heating the laminate for compression heating is not particularly limited, a heating means such as a heater is provided in the press-molding lower mold 31 and the upper mold 33, and the press-molding lower mold 31 and the upper mold 33 are used for heating. is easy to do. The heating temperature is higher than the curing reaction temperature of the thermosetting resin.

When the compression/heating laminate 10A is compressed during the compression/heating step, the thermosetting resin impregnated in the impregnated carbon fiber fabric, the unidirectional carbon fiber sheet, or a composite laminate thereof 23B is extruded. Then, the porous sheet 25A in contact with the impregnated carbon fiber fabric, unidirectional carbon fiber sheet, or composite laminate thereof 23B is impregnated, and the impregnated surface member 27A is entirely impregnated. Although the porous sheet 25A is already impregnated with the thermosetting resin in the impregnation step, the porous sheet 25A is further impregnated with the thermosetting resin by this compression heating step. Also, in the compression heating process, the porous sheet 25A is depressed at the portion in contact with the honeycomb core 11A by being compressed by the end portion of the wall of the honeycomb core 11A, and the honeycomb core 11A bites into the porous sheet 25A. At the portion where the honeycomb core 11A bites, the thermosetting resin in the porous sheet 25A exudes, and the exuded thermosetting resin rises along the wall of the honeycomb core 11A, sandwiching the end of the wall. becomes.

The thermosetting resin starts a curing reaction by heating, the surface material 21 is formed from the impregnated surface material member 27A, and the honeycomb laminate 10 in which the surface material 21 and the honeycomb core 11A (11) are bonded and integrated. is formed. Furthermore, at the contact position between the porous sheet and the honeycomb core, the exuded thermosetting resin rises along the wall of the honeycomb core 11A and hardens in a state where the end of the wall of the honeycomb core 11A is sandwiched. , the fillet 17 is formed. After that, the heating compression is released to obtain the honeycomb laminate 10 .

In a phenol resin solution (manufactured by Sumitomo Bakelite Co., Ltd., product name: PR-55791B, resin concentration 60 wt% ethanol solution), twill carbon fiber fabric (manufactured by Teijin Limited, product name; W-3161, fiber weight 200 g / m ² ) was soaked and taken out to produce an impregnated carbon fiber fabric. The carbon fiber fabric was cut into a plane size of 200×350 mm (weight: 14 g/sheet).

In the same manner, the required number of impregnated carbon fiber fabrics for each example and comparative example was produced, and on one side of each of the two impregnated carbon fiber fabrics used in each example, the carbon fiber fabric was impregnated with The porous sheet was attached using the tackiness of the thermosetting resin.

For Examples 1 to 3 and Examples 5 to 6, the porous sheet was a sheet-like flexible urethane foam (interconnected cell structure, manufactured by INOAC Corporation, product name: MF-50, thickness 0.7 mm, density 30 kg/ m ³ ), and in Example 4, carbon nonwoven fabric (product name: CARMIX CFRP manufactured by Awa Paper Mills, thickness 1 mm, basis weight 120 g/m ² ) was used.
No porous sheet was attached to the impregnated carbon fiber fabric for the comparative example.

After that, the impregnated carbon fiber fabric to which the porous sheet is attached and the impregnated carbon fiber fabric to which the porous sheet is not attached are naturally dried at a room temperature of 25°C for 2 hours, and further under an atmosphere of 60°C. and dried for 1 hour to prepare a prepreg with a porous sheet and a prepreg without a porous sheet.

As the honeycomb core, aluminum honeycomb with a cell size of 1/8 inch (thickness: 3 mm, weight: 37 g/sheet) and aluminum with a cell size of 1 inch cut into a plane size of 200 x 350 mm were used as the honeycomb core. A honeycomb (thickness: 3 mm, weight: 40 g) and an aluminum honeycomb with a cell size of ⅛ inch (thickness: 2 mm, weight: 25 g) were used.

Next, for each example, the required number of prepregs without porous sheets, prepregs with porous sheets, and aluminum honeycomb were placed on a lower mold for press molding made of SUS whose surface was coated with a mold release agent in advance. , the prepreg with the porous sheet, and the required number of prepregs without the porous sheet are stacked in this order, and the porous sheet is brought into contact with the aluminum honeycomb. As a result, a laminate for compression heating having a structure in which the prepregs were arranged on both sides of the honeycomb core so that the honeycomb core and the porous sheet of the prepreg were in contact with each other were set on the lower mold for press molding. A laminate of a prepreg without a porous sheet and a prepreg with a porous sheet corresponds to an impregnated surfacing member. In addition, for the comparative example, a compression heating laminate having a configuration in which the required number of prepregs without porous sheets, aluminum honeycomb, and the required number of prepregs without porous sheets were stacked in this order was prepared under press molding. set on the mold.

SUS spacers having thicknesses corresponding to the thicknesses of the honeycomb laminates of Examples and Comparative Examples were arranged at the four corners of the press-molding lower mold, and the laminate for compression heating on the press-molding lower mold was heated at 150°C for 30 minutes. The phenolic resin was reacted and cured by pressing with an upper mold for press molding (flat plate shape) for 1 minute, followed by compression and heating. Heating of the laminate for compression heating at that time was performed by casting heaters attached to the lower mold and the upper mold for press molding. In addition, a surface pressure (press pressure) of 10 MPa was applied to Examples 1 and 2, Examples 4 to 6, and Comparative Example, while a surface pressure (press pressure) of 15 MPa was applied to Example 3. It was pressed with an upper die (flat plate), and subjected to compression and heating.

Then, after cooling the press-molding lower mold and the upper mold at room temperature, the press-molding lower mold and the upper mold were opened to obtain a honeycomb laminate. In the obtained honeycomb laminate of each example, the surface material obtained by curing the laminate of the non-porous prepreg and the prepreg with the porous sheet (impregnated surface material member) was integrally laminated on both sides of the aluminum honeycomb. The aluminum honeycomb bit into the porous sheet, and a flip was formed at the biting position. On the other hand, in the honeycomb laminate of the comparative example, a plurality of non-porous prepregs were laminated and hardened surface materials were laminated and integrated on both sides of the aluminum honeycomb. It wasn't.

In addition, the bending elastic modulus of the surface material was measured for the honeycomb laminates of each example and comparative example. As a result, when the bending elastic modulus was 20 MPa or more and the honeycomb laminate did not peel, the evaluation was given as "⊚", and in other cases (the bending elastic modulus was less than 20 MPa and/or the honeycomb laminate peeled off). case) was evaluated as “x”.
The flexural modulus was measured according to JIS K7074.

FIG. 6 shows the configuration and evaluation of each example and comparative example. All of the honeycomb laminates of Examples 1 to 6 had a flexural modulus of 25 to 31 GPa and no peeling of the surface material, and were evaluated as "A". In the honeycomb laminates of Examples 1 to 6, the peel strength of the surface material is high and the rigidity is high due to both the increase in adhesion strength due to the honeycomb core biting into the porous sheet of the surface material and the increase in adhesion strength due to the fillets. was high.

On the other hand, the honeycomb laminate of the comparative example had a flexural modulus of 6 GPa and was evaluated as "x". In the honeycomb laminate of the comparative example, the surface material (prepreg) is simply in contact with the honeycomb core and hardened, and the honeycomb core does not bite into the surface material and no fillet is formed. The adhesive strength of the surface material was lower than that of the examples, the surface material was easily peeled off, and the rigidity was greatly reduced.

As described above, according to the present invention, it is possible to obtain a honeycomb laminate in which the honeycomb core bites into the porous sheets of the surface material laminated on both sides of the honeycomb core to form fillets. Due to both the effect of increasing the adhesive strength obtained and the effect of increasing the adhesive strength obtained by the fillet, the adhesion between the honeycomb core and the surface material can be strengthened (the peel strength of the surface material is large).

Furthermore, in the method for manufacturing the honeycomb laminate 10 of the present invention, it is not necessary to form the surface material in advance and bond the surface material to the honeycomb core with an adhesive. That is, in the method for manufacturing the honeycomb laminate 10 of the present invention, the formation of the surface material (prepreg) and the bonding of the honeycomb core can be performed simultaneously when the thermosetting resin of the prepreg is cured, which streamlines the manufacturing process. can.

REFERENCE SIGNS LIST 10 Honeycomb laminate 10A Compressive heating laminate 11, 11A Honeycomb core 13 Wall 17 Fillet 21 Surface material 23, 23A Carbon fiber fabric, unidirectional carbon fiber sheet, or a composite laminate thereof 23B Impregnated carbon fiber fabric 25, 25A Porous sheet 27 Surface material member 27A Impregnated surface material member 31 Lower mold for press molding 32 Upper mold for press molding

Claims (4)

In a honeycomb laminate in which surface materials are laminated on both sides of a honeycomb core,
The surface material is a carbon fiber fabric, a unidirectional carbon fiber sheet, or a composite laminate thereof, and a surface material member laminated with a porous sheet, impregnated with a thermosetting resin and cured.
The porous sheet is a foam,
The surface material and the honeycomb core are in contact with the porous sheet and the honeycomb core,
A honeycomb laminate according to claim 1, wherein at a contact position between the porous sheet and the honeycomb core, the honeycomb core bites into the porous sheet and the thermosetting resin exuded from the porous sheet is cured. body. In a honeycomb laminate in which surface materials are laminated on both sides of a honeycomb core,
The surface material is a carbon fiber fabric, a unidirectional carbon fiber sheet, or a composite laminate thereof, and a surface material member laminated with a porous sheet, impregnated with a thermosetting resin and cured.
The porous sheet includes a carbon fiber nonwoven fabric or a glass fiber nonwoven fabric,
The surface material and the honeycomb core are in contact with the porous sheet and the honeycomb core,
A honeycomb laminate according to claim 1, wherein at a contact position between the porous sheet and the honeycomb core, the honeycomb core bites into the porous sheet and the thermosetting resin exuded from the porous sheet is cured. body. In a honeycomb laminate in which surface materials are laminated on both sides of a honeycomb core,
The surface material is a carbon fiber fabric, a unidirectional carbon fiber sheet, or a composite laminate thereof, and a surface material member laminated with a porous sheet, impregnated with a thermosetting resin and cured.
The porous sheet has a basis weight of 120 to 200 g/m ² is a nonwoven fabric of
The surface material and the honeycomb core are in contact with the porous sheet and the honeycomb core,
A honeycomb laminate according to claim 1, wherein at a contact position between the porous sheet and the honeycomb core, the honeycomb core bites into the porous sheet and the thermosetting resin exuded from the porous sheet is cured. body. The honeycomb laminate according to claim 1 , wherein the foam has a density of 5 to 100 kg/m ³ .

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