JPH08118522A - Honeycomb made of fiber reinforced plastic and production thereof - Google Patents

Abstract

PURPOSE: To obtain a honeycomb made of fiber reinforced plastic excellent from the aspect of production cost because the preparation cost of a matrix or the molding processing cost to a corrugated board is reduced and enhanced in rigidity and strength by easily and strongly bonding a thermosetting resin to cell walls as post-treatment to infiltrate the same into the cell walls. CONSTITUTION: A honeycomb made of fiber reinforced plastic being a planar aggregate of hollow coloumnar cells is produced by bonding a thermoplastic resin sheet 3 to the single surface of a fiber base material sheet 2 composed of a glass fiber, a carbon fiber, a ceramic fiber, a Kevlar fiber, a metal fiber or a resin fiber to prepare a matrix consisting of laminar sheets and subjecting the matrix to molding processing while softening the same under heating to form a corrugated sheet having corrugated unevenness continuously formed thereto and subsequently cooling and curing the corrugated board and superposing a plurality of the corrugated sheets one upon another so as to fit valley parts and ridge parts to bond them.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a honeycomb core made of fiber reinforced plastic and a method for manufacturing the same. That is, the present invention relates to a honeycomb core made of fiber reinforced plastic (FRP) and its manufacturing method using a corrugated plate.

[0002]

2. Description of the Related Art In this method of manufacturing a honeycomb core made of fiber reinforced plastic, first, a thermosetting resin such as an epoxy resin is provided on both sides of a fiber base material sheet such as glass fiber, carbon fiber or ceramic fiber. A base material that has been adhered and impregnated by dipping or the like is prepared. After bending the prepreg-shaped base material, that is, the prepreg-shaped base material in a so-called B stage state in which the thermosetting resin is semi-cured by heating, after bending it into a corrugated plate shape using a corrugated molding device such as a gear or a rack. By inserting into a dedicated die jig and heat-curing while maintaining its shape to form a corrugated sheet, and then stacking and adhering a plurality of such corrugated sheets, Honeycomb cores made of fiber reinforced plastic were manufactured. Note that, instead of such a manufacturing method, a method for manufacturing a honeycomb core made of fiber-reinforced plastic has also been developed, in which a thermoplastic resin is used instead of the thermosetting resin. Then, in this manufacturing method, first, a film-shaped thermoplastic resin on both sides of the fiber base material sheet is heated while being pressed using a pressing device, a calender roll device, or the like, so that the honey is impregnated and completely impregnated, and completely. An integrated base material is prepared. Then, the base material softened by reheating is pressed with a corrugating machine, cooled and hardened to form a corrugated sheet, and then a plurality of such corrugated sheets are stacked and adhered to form a fiber. Honeycomb cores made of reinforced plastic were manufactured.

[0003]

By the way, the following problems have been pointed out in such a conventional example. First,
In the conventional example using the thermosetting resin described above, when the base material is formed into a corrugated plate, it takes an extremely long time to heat-cure (a thermosetting resin requires a long time to heat-cure). However, since it is necessary to use a dedicated die jig, there is a difficulty that it takes a lot of time. That is, regarding the conventional manufacturing method using the thermosetting resin and the manufactured honeycomb core made of fiber reinforced plastic, it takes time and labor to form the corrugated sheet, and a problem in manufacturing cost has been pointed out. .

Next, in the conventional example using the above-mentioned thermoplastic resin, the corrugated sheet can be easily and easily formed without requiring such time and labor, while the following first and second examples are provided. The problem was pointed out. Firstly, a base material which is completely integrated by using film-like thermoplastic resin on both sides of a fibrous base material sheet by pressing and heating and impregnating honey into the honey is used, thus increasing the preparation cost of the base material. There was a difficulty. That is, the base material of the conventional corrugated sheet using the thermoplastic resin has the thermoplastic resin bonded to both sides of the fiber base sheet and is not only heated and pressed but also by a very high level of high temperature and high pressure (thermoplastic Resin has poor fluidity when melted and requires a high level of high temperature and high pressure.) Both are impregnated in honey without voids, holes, gaps, etc., and a completely integrated one is used. The processing was very troublesome and the preparation cost was expensive. Therefore, regarding the manufacturing method using the conventional thermoplastic resin and the manufactured honeycomb core made of fiber reinforced plastic, from this aspect,
A problem was pointed out in terms of manufacturing cost.

Secondly, regarding the manufactured honeycomb core made of fiber reinforced plastic, in order to further increase the rigidity and strength, as a post-treatment, a thermosetting resin or the like is dipped on the outer surface of the cell wall. However, such adhesion and impregnation may be difficult in some cases. That is, since the base material of the cell wall has a structure in which film-shaped thermoplastic resins are bonded and integrated on both sides of the fiber base material sheet, all outer surfaces are completely flat due to the cured thermoplastic resin. All the irregularities and gaps due to the fiber base sheet are completely filled. Therefore, after this, if a thermosetting resin or the like is to be further attached or impregnated from the outside, such a reinforcing thermosetting resin or the like is difficult to join and fix and easily peels off. Was often difficult.
As described above, it has been pointed out that the conventional manufacturing method using a thermoplastic resin and the manufactured honeycomb core made of fiber reinforced plastic are not easy to be reinforced after the fact.

In view of such circumstances, the present invention has been made to solve the above-mentioned problems of the conventional example, and is more preferable than a layered sheet in which a thermoplastic resin sheet is bonded to only one side of a fiber base sheet. By adopting the base material, the first object is to propose a honeycomb core made of fiber reinforced plastic, which is excellent in terms of manufacturing cost, and secondly, which can surely be reinforced after the fact, and a manufacturing method thereof. To do.

[0007]

The technical means of the present invention for achieving this object is as follows. First, claim 1
About: That is, the honeycomb core made of the fiber reinforced plastic is a planar aggregate of hollow columnar cells, and as a base material for the cell walls forming the cells,
A layered sheet is used in which a thermoplastic resin sheet is bonded to one side of a fiber base sheet. Next, claim 2 is as follows. That is, in this method for manufacturing a honeycomb core made of fiber reinforced plastic, first, a base material made of a layered sheet in which a thermoplastic resin sheet is bonded to one surface of a fiber base material sheet is prepared, and then the base material is corrugated. The corrugated plate with the unevenness continuously bent is molded while being softened by heating and hardened by cooling. Thereafter, a plurality of the corrugated sheets are stacked and adhered so that the valleys and the tops are aligned, and a honeycomb core made of fiber-reinforced plastic, which is a planar aggregate of hollow columnar cells, is obtained.

[0008]

Since the present invention comprises such means, it operates as follows. In this honeycomb core made of fiber reinforced plastic and its manufacturing method, as the base material of the cell wall,
A layered sheet in which a thermoplastic resin sheet is bonded to only one side of a fiber base sheet is used. A honeycomb core made of fiber reinforced plastic is obtained by forming such a base material into a corrugated plate, and then stacking and bonding the corrugated plate.

Therefore, in the honeycomb core made of fiber reinforced plastic and the manufacturing method thereof, firstly, although the base material is made of a thermoplastic resin, it is easily prepared as a layered sheet and is troublesome due to high temperature and high pressure. Since it is made of a thermoplastic resin, it does not require time and labor for forming the corrugated sheet. Therefore, the cost for preparing the base material and the cost for forming the corrugated sheet are reduced. Secondly, on one side of the cell wall, that is, on one side of the base material, the fibrous base material sheet is exposed as it is without the thermoplastic resin sheet being joined. Therefore, adhesion and impregnation of a thermosetting resin or the like, which is performed as a post-treatment, can be easily and strongly performed on such one surface without fear of peeling, and rigidity and strength can be reliably reinforced.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in the drawings. First, FIGS. 1, 2, 3 and 4
1 is used to explain an embodiment of the present invention, and FIG. 1 shows a step of joining a thermoplastic resin to one side of a fiber base sheet using a pressure roll, FIG. The figure is a front explanatory view, and (3) is a front explanatory view of an example performed in a high temperature chamber. 2 (1) is a front explanatory view of a step of joining a thermoplastic resin to one side of a fiber base sheet using an adhesive, and FIG. 2 (2) is a perspective view of a step of forming a corrugated sheet,
(3) FIG. 3 is a front view of the formed corrugated sheet. FIG.
And FIG. 4 is a front explanatory view showing an enlarged main part showing one example and another example of the manufactured honeycomb core made of fiber reinforced plastic.

In the method for manufacturing the honeycomb core 1 made of the fiber reinforced plastic, first, as shown in FIG. 1 and FIG. 2A, the thermoplastic resin sheet 3 is bonded to one side of the fiber base sheet 2. A base material 4 made of a layered sheet is prepared.

The step of preparing the base material 4 will be described in more detail. First, as the fiber base sheet 2, glass fiber, carbon fiber, ceramic fiber, Kevlar fiber,
Thin sheets of metal fibers, resin fibers, or other woven or non-woven reinforcing fibers are used. In addition, when a non-woven fiber base sheet 2 is used, in order to maintain the sheet shape,
A resin such as an adhesive or pulp is mixed as a binder for joining. Further, as the thermoplastic resin sheet 3 bonded to one side of the fiber base sheet 2, a thin sheet of thermoplastic resin such as polyphenylene sulfide (PPS), polyether ether ketone (PEEK), polyimide (PI) is used. However, a mixture of various fiber reinforced plastic chops or the like may also be used.

Then, the thermoplastic resin sheet 3 is bonded to one side of the fiber base sheet 2. As this joining method, a pressure and heating method using pressure bonding rolls 5 and 6 as shown in FIG. 1 or an adhesive method using an adhesive agent 7 as shown in FIG. First, FIG. 1 (1) diagram,
(2) In the pressurizing and heating method shown in the figure, the one in which the thermoplastic resin sheet 3 is placed on the fiber base material sheet 2 is sandwiched and passed between the upper and lower pressure-bonding rolls 5 in which the heater is incorporated. As a result, the thermoplastic resin sheet 3 is appropriately melted and softened, and is continuously bonded to the surface of the fiber base material sheet 2, that is, one surface. Further, in the pressurizing and heating method shown in FIG. 1C, the high temperature chamber 8 is used instead of incorporating the heater in the pressure bonding roll 5 as in the above-mentioned method. According to the above, the fibrous base material sheet 2 and the thermoplastic resin sheet 3 are passed between the pressure bonding rolls 6 so that they are continuously joined.
Further, in the bonding method shown in FIG. 2 (1), an adhesive 7 is used instead of the pressure rolls 5 and 6, and the fiber base sheet 2 and the thermoplastic resin sheet 3 are used. But,
The sheets are sequentially and continuously joined via the sheet-shaped adhesive 7.

In this way, the base material 4 as a layered sheet in which the thermoplastic resin sheet 3 is bonded to one surface of the fiber base sheet 2 is prepared. That is, the base material 4 is a fiber-reinforced plastic sheet in which the fiber base sheet 2 and the thermoplastic resin sheet 3 are combined by joining. First, the bonding interface between the fibrous base material sheet 2 and the thermoplastic resin sheet 3 has a temperature and pressure during heating and pressurization, an adhesive 7 and the like.
Depending on the type, etc., the thermoplastic resin sheet 3 is simply stuck and attached to the surface of the fiber base sheet 2, and the melted portion of the thermoplastic resin sheet 3 flows further into the fiber base sheet 2. , Even those that have penetrated and are impregnated can be of various grades and stages between. Secondly, the base material 4 of the illustrated embodiment has a two-layer structure in which one thermoplastic resin sheet 3 is bonded to one side of one fiber base sheet 2, but the number of these is The present invention is not limited to this. For example, a base material 4 having a multilayer structure in which two or more thermoplastic resin sheets 3 are sequentially joined to one surface of one fibrous base material sheet 2 is also possible.

Thereafter, the base material 4 made of a layered sheet in which the thermoplastic resin sheet 3 is bonded to one surface of the fiber base material sheet 2 in this way is shown in FIGS. 2 (2) and 2 (3). As described above, the corrugated plate 9 having the corrugated concavities and convexities continuously bent and formed is molded while being softened by heating and hardened by cooling.

The step of forming the corrugated sheet 9 will be described in more detail. First, as described above, the fiber base sheet 2
The base material 4 to which the thermoplastic resin sheet 3 is joined is softened by heating to increase its flexibility and viscosity, and is supplied to the corrugate forming device 11 using the gears 10 which are vertically opposed gears and are gear-shaped molds. To be done. And the base material 4 is the gear 1
The corrugated sheet 9 is formed by being sandwiched between 0s, fed while being bitten, and pressurized. Then, the corrugated plate 9 that has been cooled and hardened (that is, the corrugated plate 9 that has been hardened by cooling the thermoplastic resin sheet 3) has a substantially triangular shape in addition to the trapezoidal shape shown in the figure.
The corrugated irregularities having a substantially square shape and other various shapes are formed by being continuously bent and formed in the longitudinal direction at a predetermined pitch and height. First, the heating of the base material 4 described above is performed by the gear 10
It is carried out by incorporating a heater inside or by placing the gear 10 in the high temperature chamber. Secondly, the corrugating apparatus 11 can use not only the method using the gear 10 in the illustrated example, but also a method using the gear 10 and a rack, a method using a corrugated belt, and various other methods. Thirdly, the corrugated plate 9 shown in FIG.
Is made of the base material 4 prepared by the pressurizing and heating method shown in FIG. 1, and the base material 4 prepared by the bonding method shown in FIG. In the corrugated sheet 9 using, the adhesive 7 is further positioned between the fiber base sheet 2 and the thermoplastic resin sheet 3.

Thereafter, a plurality of such corrugated plates 9 are
By stacking and adhering the valley portion and the top portion together, as shown in FIG. 3 and FIG. 4, the honeycomb core 1 made of fiber reinforced plastic, which is a planar aggregate of the hollow columnar cells 12, is manufactured. It

The stacking and bonding steps will be described in more detail. First, with respect to the corrugated plate 9 formed as described above, the adhesive 13 is applied to the short-side direction ridges such as the bottom surface of the wave and the top surface of the top. Then, the corrugated sheet 9 thus coated with the adhesive 13 is cut into predetermined lengths after the adhesive 13 is dried. Then, a large number of corrugated plates 9 are sequentially shifted up and down by a half pitch of the wave, and are placed in a laminated block shape in which there is a space as a whole under the positional relationship of aligning the valley and the top with each other. Although they are piled up, a flat plate may be interposed between the corrugated plates 9 (not shown). Thereafter, the corrugated sheets 9 thus stacked are heated and pressed at the melting point temperature of the adhesive agent 13 in a furnace or the like to melt and cure the adhesive agent 13 which has been applied and interposed. The stacked corrugated sheets 9 are bonded together.

In this manufacturing method, the corrugated plate 9 composed of the above-mentioned base material 4 is obtained by following these steps.
Is used as the cell wall 14, and a honeycomb core 1 made of fiber-reinforced plastic, which is a planar aggregate of a large number of hollow columnar cells 12 partitioned in independent spaces, is manufactured.

By the way, the honeycomb core 1 made of fiber reinforced plastic shown in FIG. 3 and the honeycomb core 1 made of fiber reinforced plastic shown in FIG. First of all, in the example of FIG.
Are aligned in the same vertical direction, and all the corrugated sheets 9 are laminated in such a manner that the thermoplastic resin sheet 3 is located on the upper side and the fiber base material sheet 2 is located on the lower side. Therefore, the honeycomb core 1 made of fiber reinforced plastic shown in FIG.
Then, for each cell 12, half of the cell wall 14 (upper half in the drawing) has the fiber base sheet 2 exposed to the outer surface side, and conversely, the remaining half of the cell wall 14 (lower in the drawing). In half, the thermoplastic resin sheet 3 is exposed on the outer surface side. On the other hand, in the example of FIG. 4, the vertical direction of the corrugated sheet 9 is alternately inverted and replaced, and the corrugated sheet 9 on which the thermoplastic resin sheet 3 is located is on the upper side and the fiber base sheet is on the upper side. The corrugated sheets 9 on which the two are located are alternately laminated. Therefore, in the honeycomb core 1 made of the fiber reinforced plastic of FIG. 4, the cells 12 in which the fiber base material sheet 2 is exposed on the outer surface side of the cell wall 14 and the thermoplastic resin sheet 3 on the outer surface side of the cell wall 14 are provided. The exposed cells 12 are vertically arranged in rows and alternately arranged horizontally. By the way, through the examples of FIGS. 3 and 4, it is desirable that the adhesive 13 applied and interposed penetrate the fiber base sheet 2 to the inside.

The honeycomb core 1 made of fiber reinforced plastic is a fiber reinforced material in which a thermoplastic resin sheet 3 is bonded to one side of a fiber base sheet 2 as a base material 4 of a cell wall 14 forming cells 12 of the fiber core sheet. A plastic sheet is used. Incidentally, the cell walls 14 and the cells 12 typically have a regular hexagonal sectional shape as shown in the drawing.
Regardless of this, triangles, squares, and other various shapes are also possible. The honeycomb core 1 made of fiber reinforced plastic has an excellent weight-to-weight ratio, is lightweight and has high rigidity and strength, as well as general ones, and has a rectifying effect, plane accuracy, heat retention, and sound insulation. It has excellent characteristics such as large surface area per unit volume, and so on.

When higher rigidity and strength are required for the honeycomb core 1 made of such a fiber reinforced plastic, the outer surface of the cell wall 14 is reinforced as a further post-treatment. FIG. 5 (1) is a perspective view of the step of adhering and impregnating the thermosetting resin 15 as a post-treatment, and FIG. 5 (2) is a perspective view of the post-drying / curing step. In FIG. 6, as the post-treatment, the thermosetting resin 15 is attached,
The impregnated fiber-reinforced plastic honeycomb core 1 is shown, (1) is an enlarged front explanatory view of a main part thereof, and (2) is an enlarged front sectional explanatory view of a cell wall 14 thereof. Is.

The post-processing will be described in more detail. When such a post-treatment is carried out, the honeycomb core 1 made of the fiber-reinforced plastic manufactured as described above has a structure shown in FIG.
As shown in the figure, it is first immersed in the bath 16. In the illustrated example, a thermosetting resin 15 such as a solution type epoxy resin or a phenol resin is stored in the bathtub 16 together with the solvent, but the thermosetting resin 15 is heated and melted into a liquid state regardless of this. Resin may be stored in some cases. In the illustrated example, the reinforcing thermosetting resin 15 is adhered and impregnated onto the outer surface of the cell wall 14 of the honeycomb core 1 made of fiber reinforced plastic by being immersed in such a bath 16. Then, the honeycomb core 1 made of the fiber reinforced plastic thus adhered and impregnated is taken out from the bath 16 and then heated by the heater 17 or the radiant heat as shown in FIG. 5 (2). The thermosetting resin 15 that has been heated and dried and thus adhered and impregnated is cured, and is strongly bonded and fixed to the outer surface of the cell wall 14. Note that, regardless of the illustrated example, when a thermoplastic resin is attached and impregnated in place of the thermosetting resin 15, the thermoplastic resin is cured by cooling and drying,
It is bonded and fixed to the outer surface of the cell wall 14. The thermosetting resin 15 and the like thus adhered and impregnated reinforce the rigidity and strength of the honeycomb core 1 made of fiber reinforced plastic.

In the illustrated embodiment, as shown in FIG. 6, the sectional structure of the cell wall 14 is impregnated with a thermosetting resin 15 in the form of a film, a thermoplastic resin sheet 3 and a thermosetting resin 15. And a fibrous base material sheet 2, a film-like thermosetting resin 15 adhered to the fibrous base material sheet 2 without being impregnated in the fibrous base material sheet 2, and the like. Note that, depending on the viscosity of the thermosetting resin 15 and the conditions such as the immersion temperature and the immersion time in the bath 16, it is possible that the thermosetting resin 15 has almost no coating layer. The degree of impregnation of the sheet 2 can be controlled appropriately.

The present invention has been described above. Then it becomes as follows. In this honeycomb core 1 made of fiber reinforced plastic and the manufacturing method thereof, a layered sheet in which the thermoplastic resin sheet 3 is bonded to only one surface of the fiber base material sheet 2 is used as the base material 4 of the cell wall 14 (Fig. 1 and (1) of FIG. 2). Then, after such a base material 4 is formed into a corrugated plate 9 ((2) in FIG. 2).
(See FIG. 3, (3)), and by stacking and adhering them, the honeycomb core 1 made of fiber reinforced plastic is obtained (see FIGS. 3, 4). Therefore, the honeycomb core 1 made of the fiber reinforced plastic and the manufacturing method thereof are as follows.

First, the base material 4 of the cell wall 14 is simply and easily prepared as a layered sheet by simply joining the thermoplastic resin sheet 3 to the fibrous base sheet 2, and the thermoplastic resin described above is used. Unlike the conventional example of this kind, it does not require a high temperature and high pressure and a troublesome complete integration process.
Further, unlike the conventional example of this type using the thermosetting resin described above, there is no need for time and labor for forming the corrugated sheet 9.

Secondly, regarding the manufactured honeycomb core 1 made of fiber reinforced plastic, in order to further increase the rigidity and strength, as a post-treatment, a thermosetting resin 15 or the like is applied to the outer surface of the cell wall 14. Adhesion and impregnation are often carried out by dipping treatment or the like. At that time, the cell wall 14 of the honeycomb core 1 made of the fiber reinforced plastic and the base material 4 thereof are made of the one in which the thermoplastic resin sheet 3 is bonded to one side of the fiber base sheet 2, and the outer surface of the one side is The thermoplastic resin sheet 3 is not bonded and the fiber base sheet 2 is exposed as it is. Therefore, the adhesion and impregnation of the thermosetting resin 15 etc., which is carried out as a post-treatment,
Half of this is performed on the outer surface of the cell wall 14 where the fibrous base material sheet 2 is exposed in this way, so that strong adhesion and impregnation are realized. Since the adhesion and the impregnation are performed in this way,
This honeycomb core 1 made of fiber reinforced plastic can surely carry out reinforcement of rigidity and strength after the fact.

[0028]

As described above, the honeycomb core made of fiber reinforced plastic according to the present invention and the method for manufacturing the honeycomb core have a base material composed of a layered sheet in which a thermoplastic resin sheet is bonded to only one side of a fiber base sheet. By adopting, the following effects are exhibited.

First, the manufacturing cost is excellent. That is, like this type of conventional example using the thermoplastic resin described above, the complete integration process of the base material is not cumbersome and the preparation cost is not increased, and the base material is easily and easily prepared as a layered sheet, and, Unlike the conventional example of this type using the thermosetting resin described above, there is no need for time and labor for forming the corrugated plate. Therefore, the preparation cost of the base material and the cost of forming the corrugated sheet are reduced, and the manufacturing cost is excellent.

Secondly, it is possible to surely perform post-reinforcement.
That is, unlike the above-mentioned conventional example of this kind, it is not difficult to adhere and impregnate the cell wall with the thermosetting resin or the thermoplastic resin as a post-treatment, and easy and strong adhesion and impregnation can be performed. This is possible, and thus the rigidity and strength of the honeycomb core made of fiber reinforced plastic can be surely implemented. As described above, the effects of the present invention are remarkably large, such as the problems existing in this type of conventional example are eliminated.

[Brief description of drawings]

FIG. 1 is used to explain an example of a honeycomb core made of fiber reinforced plastic and a method for manufacturing the same according to the present invention, and shows a step of joining a thermoplastic resin to one surface of a fiber base sheet using a pressure roll. Yes, (1) is a perspective view thereof, (2) is a front explanatory view, and (3) is a front explanatory view of an example performed in a high temperature chamber.

2 is a front explanatory view of a step of joining a thermoplastic resin to one surface of a fiber base sheet using an adhesive, for explaining the same embodiment, and FIG. It is a perspective view of the process of forming into a corrugated plate, and (3) is a front explanatory view of the formed corrugated plate.

[Fig. 3] Fig. 3 is a view showing one example of a honeycomb core made of fiber reinforced plastic, which was manufactured by being used for the description of the same embodiment.
It is the front explanatory view which expanded the principal part.

[Fig. 4] Fig. 4 shows another example of the manufactured honeycomb core made of fiber reinforced plastic, which is used for the description of the example, and is an enlarged cross-sectional explanatory view of the main part.

FIG. 5 is a perspective view of a step of attaching and impregnating a thermosetting resin as a post-treatment, which is used for the description of the same embodiment.
(2) The figure is a perspective view of the post-drying and curing steps.

FIG. 6 is a view showing a honeycomb core made of fiber reinforced plastic to which a thermosetting resin is adhered and impregnated as a post-treatment, which is used for the description of the same embodiment, and FIG. It is a front explanatory view, and (2) figure is the front section explanatory view which further expanded the cell wall.

[Explanation of symbols]

 1 Honeycomb core made of fiber reinforced plastic 2 Fiber substrate sheet 3 Thermoplastic resin sheet 4 Base material 5 Crimping roll 6 Crimping roll 7 Adhesive 8 High temperature chamber 9 Corrugated plate 10 Gear 11 Corrugate molding device 12 Cell 13 Adhesive 14 Cell wall 15 Thermosetting Resin 16 Bath 17 Heater

Claims (2)

[Claims] 1. A planar assembly of hollow columnar cells, wherein a layered sheet in which a thermoplastic resin sheet is bonded to one side of a fibrous base material sheet is used as a base material of a cell wall forming the cell. Honeycomb core made of fiber reinforced plastic. 2. A base material comprising a layered sheet in which a thermoplastic resin sheet is bonded to one surface of a fibrous base material sheet is prepared, and then the base material is continuously bent and formed with corrugated irregularities. A corrugated plate is molded while being heat-softened and cooled and hardened, and then a plurality of the corrugated plates are stacked and bonded together with their valleys and peaks aligned to form a planar assembly of hollow columnar cells. A method for manufacturing a honeycomb core made of fiber reinforced plastic, comprising obtaining a honeycomb core made of a fiber reinforced plastic.