Patent Description:
As a cylindrical structure, for example, a central cylinder for an artificial satellite, a sandwich structure wherein a honeycomb core is sandwiched between facings is used for the perspective of weight saving. Since it is necessary to shape a honeycomb core being a planar extendable structure into a cylindrical shape in creating a cylindrical structure, there has been a problem that, due to the geometric property, saddle-shape deformation is generated, and workability is poor. The saddle-shape deformation is warpage in a hyperboloid shape generated in an axial direction of a cylinder.

Therefore, a honeycomb core that can be shaped into a cylindrical shape has been designed. Specifically, Patent Literature <NUM> discloses a method to extend a honeycomb core into a cylindrical shape by making a shape of an adhesion portion into a trapezoidal shape.

In the method disclosed in Patent Literature <NUM>, when a honeycomb core is extended to a cylindrical shape having a radius other than the radius determined in accordance with the size of the adhesion portion, a bent portion is generated in a cell wall surface of the honeycomb core. There has been a problem in this method that shear stiffness of the honeycomb core is decreased since the cell wall surface is likely to fall down sideways due to the bent portion when a bending load is applied to the honeycomb core.

Patent Literature <NUM> discloses a honeycomb core made from a plurality of core sheets which are laminated and adhered and finally extended to form the 3D core.

The present invention is aimed at providing a ribbon laminated body used for creating a honeycomb core capable of being extended to a cylindrical shape having an arbitrary radius within a prescribed range without decreasing shear stiffness of the honeycomb core.

There is provided according to one aspect of the present invention a ribbon laminated body used for creating a honeycomb core, the ribbon laminated body comprises:.

According to the present invention, when a ribbon laminated body is extended to a honeycomb core in a cylindrical shape, it is possible to shape the ribbon laminated body into a desired cylindrical shape without making a cell wall surface of the honeycomb core fall down sideways and the honeycomb core be deformed into a saddle shape, by making a high-temperature curing adhesive that has not been cured peel off partially in accordance with a radius of the cylindrical shape. Further, according to the present invention, since ribbons are bonded together by curing a high-temperature curing adhesive that has not peeled off, a bending surface is not generated in the cell wall surface; therefore, the cell wall surface is unlikely to fall down sideways, and as a result, the shear stiffness of the honeycomb core is retained.

Therefore, according to the present invention, it is possible to provide a ribbon laminated body used for creating a honeycomb core which can be extended to a cylindrical shape having an arbitrary radius within a prescribed range without reducing the shear stiffness of the honeycomb core.

In description of embodiments and diagrams, the same elements and corresponding elements are denoted by the same reference numerals. The description of the elements denoted by the same reference numerals is omitted or simplified appropriately.

Hereinafter, a detailed description will be made on a present embodiment with reference to diagrams.

<FIG>, <FIG>, and <FIG> are schematic diagrams illustrating concrete examples of a ribbon laminated body <NUM> according to a first embodiment. The ribbon laminated body <NUM> is used for creating a honeycomb core, which is also called a ribbon laminated body for a honeycomb core.

As illustrated in <FIG>, the ribbon laminated body <NUM> is constituted by a plurality of layers of ribbons <NUM> and adhesion portions <NUM>, wherein the plurality of layers of ribbons <NUM> are laminated so that two long sides included in each ribbon <NUM> are aligned. The plurality of layers of ribbons <NUM> are also called a multilayer ribbon. Further, each ribbon <NUM> and a ribbon <NUM> adjacent to the each ribbon <NUM> are bonded together with the adhesion portion <NUM>. The ribbon <NUM> is composed of aluminum or aramid fiber paper, etc., for example. The aramid fiber paper is Nomex (registered trademark), for example.

<FIG> is an enlarged view illustrating a configuration example of the ribbon laminated body <NUM>.

A ribbon 2a is bonded to a ribbon 2b adjacent to the ribbon 2a with adhesion portions 3a. The alphabets attached to the end of signs are denoted to distinguish between a plurality of elements.

The adhesion portions 3a are arranged at an equal pitch between the ribbon 2a and the ribbon 2b.

The ribbon 2a is bonded to a ribbon 2c with adhesion portions 3b on a surface on the opposite side of a surface facing the ribbon 2b.

The adhesion portions 3b are arranged at an equal pitch equivalent to the equal pitch between the adhesion portions 3a, between the layers of the ribbon 2b and the ribbon 2c. The pitch between the adhesion portions 3b is equivalent to the pitch between the adhesion portions 3a, and the positions of the adhesion portions 3b are shifted by half the pitch from the adhesion portions 3a in the longitudinal direction of ribbons. The length of half the pitch corresponds to half the length of the pitch between the adhesion portions 3a. The length of half the pitch may not necessarily be exactly half the length of the pitch between the adhesion portions 3a. The longitudinal direction of ribbons is a direction along a long side of the ribbon <NUM>. The interval between the adjacent adhesion portions <NUM> may not necessarily be exactly identical.

Other adhesion portions <NUM> have similar configurations as the adhesion portions 3a and the adhesion portions 3b. That is, the adhesion portions <NUM> are arranged at an equal pitch between the same ribbon layers, and positions of the adhesion portions <NUM> between certain ribbon layers are placed at positions shifted by half the pitch in the longitudinal direction of the ribbons from the positions of the adhesion portions <NUM> between ribbon layers adjacent to the certain ribbon layers.

<FIG> illustrates a concrete example of an A-A cross section of an adhesion portion <NUM> illustrated in <FIG>.

The adhesion portion <NUM> is constituted by an adhesion portion <NUM>, an adhesion portion <NUM> and an adhesion portion <NUM>. Each of the adhesion portion <NUM>, the adhesion portion <NUM> and the adhesion portion <NUM> is composed of an adhesive. The adhesive composing the adhesion portion <NUM> is called a low-temperature curing adhesive. The adhesion portion <NUM> is also called a low-temperature curing adhesion portion. The adhesive composing each of the adhesion portion <NUM> and the adhesion portion <NUM> is called a high-temperature curing adhesive. The high-temperature curing adhesive is cured at a temperature higher than the temperature at which the low-temperature curing adhesive is cured.

Each of the adhesion portion <NUM> and the adhesion portion <NUM> is also called a high-temperature curing adhesion portion. Between each two ribbons <NUM> adjacent to each other, there exist a low-temperature curing adhesion portion that adhesively bonds both ribbons <NUM>, which is in contact with the both ribbons <NUM>, and a high-temperature curing adhesion portion that is in contact with the both ribbons <NUM>. The material of the adhesive is, for example, an epoxy adhesive or an acrylic adhesive.

The curing temperature of the adhesive composing the adhesion portion <NUM> is lower than the curing temperature of the adhesive composing each of the adhesion portion <NUM> and the adhesion portion <NUM>. Further, in the ribbon laminated body <NUM>, the state of the adhesive composing the adhesion portion <NUM> is a cured state, whereas the state of the adhesive composing each of the adhesion portion <NUM> and the adhesion portion <NUM> is in an uncured state. Therefore, as a concrete example, the adhesive composing the adhesion portion <NUM> is a room-temperature curing type adhesive, and the adhesive composing each of the adhesion portion <NUM> and the adhesion portion <NUM> is a thermosetting type adhesive which is cured at a temperature higher than room-temperature.

The adhesive composing each of the adhesion portion <NUM> and the adhesion portion <NUM> has an adhesive force with a magnitude whereby the adhesion portion <NUM> is peeled off by an extension force in a depthwise direction of the ribbon <NUM> at the time when a honeycomb core precursor is generated.

The shape of the adhesion portion <NUM> at the A-A cross section is a trapezoidal shape. The trapezoidal shape is typically a shape similar to a trapezoid, which may not exactly be a trapezoid; however, description will be made by regarding the shape of the adhesion portion <NUM> at the A-A cross section as a trapezoid. With respect to two parallel sides included in the trapezoidal shape, when a shorter one is defined as an upper base, and the other one is defined as a lower base, the upper base of the adhesion portion <NUM> is located on a ribbon long side <NUM>, and the lower base of the adhesion portion <NUM> is located on a ribbon long side <NUM>.

Further, a part of the periphery of the adhesion portion <NUM> is overlapped with at least a part of one of two oblique sides included in the trapezoidal shape, and a part of the periphery of the adhesion portion <NUM> is overlapped with at least a part of the other oblique side. The shape of the low-temperature curing adhesion portion at a portion where the low-temperature curing adhesion portion is in contact with the ribbon <NUM> is a trapezoidal shape including an upper base, a lower base longer than the upper base and two oblique sides, wherein the angle formed by the upper base and each of two oblique sides is an obtuse angle. Further, at least a part of the upper base is overlapped with a part of one long side of the ribbon <NUM>, and at least a part of the lower base is overlapped with a part of the other long side of the ribbon <NUM>.

At a portion where the high-temperature curing adhesion portion is in contact with the ribbon <NUM>, a part of the periphery of the high-temperature curing adhesion portion is in contact with at least a part of one oblique side of two oblique sides included in one of the low-temperature curing adhesion portions. A part of the periphery of the high-temperature curing adhesion portion is overlapped with a part of one long side of the ribbon <NUM> at a portion where the high-temperature curing adhesion portion is in contact with the ribbon <NUM>. The high-temperature curing adhesion portion is peeled off from the ribbon <NUM> which the high-temperature curing adhesion portion is in contact with, by the extension force at the time when a honeycomb core precursor corresponding to the ribbon laminated body <NUM> is generated.

The shapes of the adhesion portion <NUM> and the adhesion portion <NUM> may be set appropriately; however, it is desirable to make a part of the periphery of each of the adhesion portion <NUM> and the adhesion portion <NUM> be shared with the ribbon long side <NUM>. Further, as the area of each of the adhesion portion <NUM> and the adhesion portion <NUM> increases, the weight of the honeycomb core is increased; therefore, it is desirable to set each of the adhesion portion <NUM> and the adhesion portion <NUM> so that the area of each of the adhesion portion <NUM> and the adhesion portion <NUM> is minimized.

In a case wherein the ribbon laminated body <NUM> is extended to a planar shape, and in a case wherein the ribbon laminated body <NUM> is extended to a cylindrical curved surface with an inner diameter equal to or larger than a cylindrical inner diameter determined from the shape of the adhesion portion <NUM>, as illustrated in <FIG>, the adhesion portion <NUM> may have any shape as long as it is a rectangular shape wherein each of the long sides of the adhesion portion <NUM> coincides with the ribbon long side <NUM> or the ribbon long side <NUM>.

As described above, according to the present embodiment, the ribbon laminated body <NUM> used for creating a honeycomb core is created.

Hereinafter, description will be made mainly on points different from those described in the embodiment above with reference to diagrams.

<FIG> and <FIG> are schematic diagrams illustrating concrete examples of a honeycomb core precursor <NUM> according to a second embodiment.

<FIG> illustrates the honeycomb core precursor <NUM> extended to become a planar shape by extending the ribbon laminated body <NUM> in a ribbon lamination direction. The ribbon lamination direction is also a lamination direction of the multilayer ribbon. The honeycomb core precursor <NUM> is also called a planar extended honeycomb core precursor.

The ribbon 2a and the ribbon 2b are bonded with a ribbon joint 12a.

<FIG> illustrates a state wherein the ribbon 2a and the ribbon 2b are virtually detached so as to show the shape of the ribbon joint 12a when the ribbon laminated body <NUM> is extended.

The ribbon joint 12a joins the ribbon 2a and the ribbon 2b via the adhesion portion <NUM>, the adhesion portion <NUM> and the adhesion portion <NUM>. Each of the adhesion portion <NUM> and the adhesion portion <NUM> is partially peeled off when the ribbon laminated body <NUM> is extended, and the shape of the ribbon joint 12a becomes a rectangular shape with a set of two parallel sides on the ribbon long side. Similarly, the shape of the ribbon joint 12b that joins the ribbon 2b and the ribbon 2c also becomes a rectangular shape. The shapes of all the ribbon joints <NUM> similarly become rectangular shapes, and as a result, the honeycomb core precursor <NUM> is extended to a planar shape having thickness.

Further, by curing adhesives constituting each of the adhesion portion <NUM> and the adhesion portion <NUM> by heating the honeycomb core precursor <NUM> at a temperature at which both of the adhesion portion <NUM> and the adhesion portion <NUM> are cured, that is, a temperature equal to or higher than a temperature at which the high-temperature curing adhesive is cured, a honeycomb core extended to a planar shape having thickness is created.

As described above, according to the present embodiment, the honeycomb core precursor <NUM> used for creating a honeycomb core extended to a planar shape having thickness is created.

Hereinafter, description will be made mainly on portions different from those of the embodiments described above with reference to diagrams.

<FIG> and <FIG> are schematic diagrams illustrating concrete examples of a honeycomb core precursor <NUM> according to a third embodiment.

<FIG> illustrates the honeycomb core precursor <NUM> which is a ribbon laminated body <NUM> extended to a cylindrical curved surface shape having thickness. The shape of the honeycomb core precursor <NUM> is a cylindrical shape having an axis along a longitudinal direction of one ribbon <NUM> included in a multilayer ribbon as a central axis. The shape of the honeycomb core precursor <NUM> may be a shape corresponding to a part of the cylindrical shape. The honeycomb core precursor <NUM> is also called a cylindrical extended honeycomb core precursor.

The ribbon 2a and the ribbon 2b are bonded at the ribbon joint 12a.

Before extending the ribbon laminated body <NUM>, the ribbon joint 12a joins the ribbon 2a and the ribbon 2b via the adhesion portion <NUM>, the adhesion portion <NUM> and the adhesion portion <NUM>. Each of the adhesion portion <NUM> and the adhesion portion <NUM> is partially peeled off when the ribbon laminated body <NUM> is extended, and the shape of the ribbon joint 12a becomes a trapezoidal shape having two parallel sides on the ribbon long side. Similarly, the shape of the ribbon joint 12b that joins the ribbon 2b and the ribbon 2c also becomes a trapezoidal shape.

The shapes of all the ribbon joints <NUM> similarly become trapezoidal shapes, and as a result, the honeycomb core precursor <NUM> is extended to a cylindrical curved surface shape. In a case wherein the shape of the cylindrical curved surface shape is considered to be cylindrical, the range which the radius of the cylindrical curved surface shape can take is determined in accordance with the shape of the adhesion portion <NUM>.

Further, by curing adhesives constituting each of the adhesion portion <NUM> and the adhesion portion <NUM> by heating the honeycomb core precursor <NUM> at a temperature equal to or higher than a temperature at which both of the adhesion portion <NUM> and the adhesion portion <NUM> are cured, that is, a temperature at which the high-temperature curing adhesive is cured, a honeycomb core extended to a cylindrical curved surface shape having thickness is created.

As described above, according to the present embodiment, the honeycomb core precursor <NUM> used for creating a honeycomb core extended to a cylindrical curved surface shape having thickness is created.

Further, according to the present embodiment, in the step of extending the ribbon laminated body <NUM> to the cylindrical shape, it is possible to shape the ribbon laminated body <NUM> into a desired cylindrical shape without making a cell wall surface of the honeycomb core fall down sideways and the honeycomb core be deformed into a saddle shape, by making an adhesive that has not cured be partially peeled off in accordance with the cylindrical radius. Further, a bending surface is not generated in the cell wall surface since the adhesive that has not peeled off is cured, and the ribbons <NUM> are bonded together; therefore, the cell wall surface is unlikely to fall down sideways, and as a result, the shear stiffness of the honeycomb core is retained.

Furthermore, according to the present embodiment, in the step of extending the ribbon laminated body <NUM> into the cylindrical shape, when an adhesive that has not been cured is partially peeled off in accordance with the cylindrical radius, a non-adhesion portion that strides across the boundary of the cell wall surface of the honeycomb core is unlikely to be generated. Therefore, the cell wall surface is unlikely to fall down sideways, and as a result, the shear stiffness of the honeycomb core is retained.

Hereinafter, description will be made mainly on parts different from those of the embodiments described above, with reference to diagrams.

<FIG> and <FIG> are schematic diagrams illustrating a concrete example of the honeycomb core precursor <NUM> according to a fourth embodiment.

<FIG> illustrates the honeycomb core precursor <NUM> in a case wherein the ribbon laminated body <NUM> is extended to a cylindrical curved surface shape.

Before extending the ribbon laminated body <NUM>, the ribbon joint 12a joins the ribbon 2a and the ribbon 2b via the adhesion portion <NUM>, the adhesion portion <NUM> and the adhesion portion <NUM>. Each of the adhesion portion <NUM> and the adhesion portion <NUM> is entirely peeled off when the ribbon laminated body <NUM> is extended, and the shape of the ribbon joint 12a becomes a trapezoidal shape with two parallel sides on the ribbon long side. Similarly, the shape of the ribbon joint 12b that joins the ribbon 2b and the ribbon 2c also becomes a trapezoidal shape. The shapes of all the ribbon joints <NUM> become trapezoidal shapes similarly, and as a result, the honeycomb core precursor <NUM> is extended to a cylindrical curved shape having thickness.

Further, by curing adhesives constituting each of the adhesion portion <NUM> and the adhesion portion <NUM> by heating the honeycomb core precursor <NUM> at a temperature at which both of the adhesion portion <NUM> and the adhesion portion <NUM> are cured, a honeycomb core extended to a cylindrical curved surface shape having thickness is created.

Hereinafter, description will be made mainly on parts different from those of the embodiments described above with reference to diagrams.

A ribbon laminated body creating method to create a ribbon laminated body <NUM> includes an application step, a lamination step, an adhesion step, and a cutting step.

In the application step, a low-temperature curing adhesive is applied to make an application shape on an application surface being one side of a ribbon sheet <NUM>. The application shape is a shape wherein a figure constituted by an area surrounded by a mountain shape projecting toward a direction along a direction orthogonal to an arrangement direction <NUM>, an inverse-mountain shape corresponding to a shape symmetric to the mountain shape with respect to a central axis, a line connecting an end point in the arrangement direction <NUM> of the mountain shape and an end point in the arrangement direction <NUM> of the inverse-mountain shape, and a line connecting an end point in the direction opposite to the arrangement direction <NUM> of the mountain shape and an end point in the direction opposite to the arrangement direction <NUM> of the inverse-mountain shape is continuously arranged in a cycle along the arrangement direction <NUM>.

The center axis is an axis along the arrangement direction <NUM>, and is an axis located in a direction opposite to the direction along the direction orthogonal to the arrangement direction <NUM> with respect to the mountain shape. Next, vertices of mountain shapes and vertices of inverse-mountain shapes are arranged along the direction orthogonal to the arrangement direction <NUM>, with a designated pitch along the direction orthogonal to the arrangement direction <NUM>, and the low-temperature curing adhesive is applied to make an application shape.

Then, by applying high-temperature curing adhesives to both sides of each low-temperature curing adhesive applied, which are both sides in the direction along the direction orthogonal to the arrangement direction <NUM>, adhesion belts constituted by the low-temperature curing adhesives and the high-temperature curing adhesives, and arranged with a designated pitch are formed. The application step is performed on ribbon sheets <NUM> for the number of application being the number of sheets corresponding to the scale of the honeycomb core to be created.

In the lamination step, the ribbon sheets <NUM> for the number of application whereon the adhesion belts are formed are first laminated so that any of each of two application surfaces does not face each other, the arrangement directions <NUM> are uniform, each of the positions of the vertices of the mountain shapes and each of the positions of the vertices of the inverse-mountain shapes are aligned in a direction along the direction orthogonal to the arrangement direction <NUM>, and the positions of the adhesion belts in each two adjacent ribbon sheets <NUM> are shifted for a half pitch corresponding to half the interval of the designated pitch in the direction along the direction orthogonal to the arrangement direction <NUM>. Next, after the ribbon sheets for the number of application are laminated, a ribbon sheet laminated body <NUM> is formed by superposing a ribbon sheet <NUM> whereon the adhesion belt has not been formed so as to cover the ribbon sheet <NUM> placed at the top layer.

In the adhesion step, a ribbon lamination adhesion block body <NUM> is created by curing the low-temperature curing adhesives included in the ribbon sheet laminated body <NUM> at a temperature equal to or higher than the temperature at which the low-temperature curing adhesive is cured, and lower than the temperature at which the high-temperature curing adhesive is cured.

In the cutting step, the ribbon lamination adhesion block body <NUM> is cut at a first cutting surface being a cross section along both of a direction along the direction orthogonal to the arrangement direction <NUM>, and the lamination direction of the ribbon lamination adhesion block body <NUM>, which is a cross section passing the vertices of the mountain shapes and the vertices of the inverse-mountain shapes.

Further, the ribbon lamination adhesion block body <NUM> is cut at a second cutting surface being a cross section along both of a direction along the direction orthogonal to the arrangement direction <NUM>, and the lamination direction of the ribbon lamination adhesion block diagram <NUM>, which is a cross section passing vertices of valleys formed between adjacent mountain shapes, and vertices of valleys formed between adjacent inverse-mountain shapes. The vertices of the valleys formed between the adjacent mountain shapes are located on the boundary of the adjacent mountain shapes. The first cutting surface and the second cutting surface alternately appear along the arrangement direction <NUM>.

Concrete description will be made on a ribbon laminated body creating method with reference to diagrams.

<FIG>, <FIG>, <FIG>, and <FIG> are schematic diagrams illustrating concrete examples of a ribbon laminated body creating method according to the fifth embodiment.

First, adhesives <NUM> constituting the adhesion portion <NUM> are disposed on one side of the ribbon sheet <NUM>. The ribbon sheet <NUM> is used for creating a honeycomb core, which is composed of aluminum or aramid fiber paper, etc., for example. The shape of the adhesives <NUM> is an application shape. A method to dispose the adhesives <NUM> is application, transference, or printing, for example. The shape of the adhesives <NUM> is a shape wherein shapes constituted by an area surrounded by a lateral V shape, which is a V shape rotated to a direction along the direction orthogonal to the arrangement direction <NUM>, and a lateral inverse-V shape being a shape symmetric about a center axis being an axis parallel to the arrangement direction <NUM>, and is an axis existing on the open side of the lateral V shape are continuously arranged in a cycle along the arrangement direction <NUM>.

The lateral V shape is a concrete example of the mountain shape. The lateral inverse-V shape is a concrete example of the inverse-mountain shape. The adhesives <NUM> are disposed with an equal pitch along the direction orthogonal to the arrangement direction. The arrangement direction <NUM> corresponds to a direction orthogonal to a ribbon longitudinal direction. The direction along the direction orthogonal to the arrangement direction <NUM> may not exactly be the same direction as the direction orthogonal to the arrangement direction <NUM>. In addition, a direction along a certain direction may not exactly be the same direction as the certain direction.

Next, adhesives <NUM> constituting the adhesion portion <NUM> and adhesives <NUM> constituting the adhesion portion <NUM> are disposed on the surface of the ribbon sheet <NUM>. A method to dispose each of the adhesives <NUM> and the adhesives <NUM> is application, transference, or printing, for example. While each shape of the adhesives <NUM> and the adhesives <NUM> may be any shape as long as it has a boundary to share with an adhesive <NUM>, <FIG> illustrates a concrete example of the shape constituted by an adhesive <NUM>, an adhesive <NUM> and an adhesive <NUM> having a rectangular shape. The rectangular shape corresponds to the adhesion belt. The adhesives <NUM> and the adhesives <NUM> are disposed with the same pitch as the adhesives <NUM> in the direction orthogonal to the arrangement direction. A ribbon sheet <NUM> is created in the procedure as described above. The ribbon sheet <NUM> is also called an adhesive application ribbon sheet.

Then, a ribbon sheet 25b is superposed on a ribbon sheet 25a in a ribbon sheet thickness direction. In this case, the ribbon sheet 25b is superposed on the ribbon sheet 25a by being shifted for a half pitch corresponding to half the interval of the pitch of the adhesives <NUM> in the direction along the direction orthogonal to the arrangement direction <NUM>. That is, in a state wherein the ribbon sheet 25a and the ribbon sheet 25b are layered, the positions where the adhesives <NUM>, the adhesives <NUM> and the adhesives <NUM> are disposed on the ribbon sheet 25a are shifted from the positions where the adhesives <NUM>, the adhesives <NUM> and the adhesives <NUM> are disposed on the ribbon sheet 25b for half the pitch in the direction along the direction orthogonal to the arrangement direction <NUM>.

Similarly, a ribbon sheet laminated body <NUM> is formed by placing a ribbon sheet <NUM> as a top layer after layering a desired number of ribbon sheets <NUM> by repeatedly layering ribbon sheets <NUM> while shifting ribbon sheets <NUM> for half the pitch in the direction along the direction orthogonal to the arrangement direction <NUM> from the adjacent ribbon sheets <NUM>. The ribbon sheet laminated body <NUM> is also called an adhesive application ribbon sheet lamination.

Next, by curing only the adhesives <NUM> of the ribbon sheet laminated body <NUM> without curing the adhesives <NUM> and the adhesives <NUM> of the ribbon sheet laminated body <NUM>, the ribbon lamination adhesion block body <NUM> is created. As a concrete example, when the adhesive <NUM> is a room-temperature curing type adhesive, the ribbon sheet laminated body <NUM> is left for a prescribed time at normal temperature. In the present example, only the adhesives <NUM> are cured, and the adhesives <NUM> and the adhesives <NUM> are not cured. Further, by heating the ribbon sheet laminated body <NUM> for a prescribed time at a temperature at which the adhesives <NUM> are cured, but the adhesives <NUM> and the adhesives <NUM> are not cured, it is possible to make only the adhesives <NUM> be cured. <FIG> illustrates a concrete example of the ribbon sheet laminated body <NUM>.

Then, a ribbon laminated body 1a and a ribbon laminated body 1b are created by cutting the ribbon lamination adhesion block body <NUM> at each of a plane that is orthogonal to the arrangement direction <NUM>, which passes the vertices of the mountain shapes at the boundaries between each of the adhesive <NUM>, the adhesive <NUM> and the adhesive <NUM>, and a plane that is orthogonal to the arrangement direction <NUM>, which passes the vertices of the valleys at the boundaries. <FIG> illustrates a concrete example of the ribbon laminated body 1a and the ribbon laminated body 1b.

As described above, according to the present embodiment, a ribbon laminated body <NUM> is created.

Hereinafter, description will be made mainly on points different from those of the embodiments described above with reference to diagrams.

<FIG> and <FIG> are schematic diagrams illustrating a concrete example of a cylindrical structure <NUM> using a honeycomb core <NUM> according to a sixth embodiment. The cylindrical structure <NUM> is also called a honeycomb sandwich cylindrical structure. <FIG> illustrates a state wherein a part of <FIG> is enlarged.

The honeycomb core <NUM> is extended to a cylindrical curved surface shape having thickness.

The cylindrical structure <NUM> is a central cylinder for an artificial satellite, for example. The cylindrical structure <NUM> is constituted by a honeycomb sandwich <NUM>. The cylindrical structure <NUM> has a sandwich structure with the honeycomb core <NUM> as a core material, wherein the inner side of the honeycomb core <NUM> is covered with a cylindrical inner diameter-side outer layer <NUM>, and the outer side of the honeycomb core <NUM> is covered with a cylindrical outer diameter-side outer layer <NUM>.

In the honeycomb sandwich <NUM>, the cylindrical inner diameter-side outer layer <NUM> is joined to the inner diameter-side surface of the honeycomb core <NUM>, and the cylindrical outer diameter-side outer layer <NUM> is joined to the outer diameter-side surface of the honeycomb core <NUM>.

As described above, according to the present embodiment, since the shear stiffness of the honeycomb core <NUM> is retained, a cylindrical structure <NUM> light in weight and high in stiffness is realized.

Further, since the shear stiffness of the honeycomb core <NUM> is retained, a central cylinder for an artificial satellite configured by the cylindrical structure <NUM> is light in weight and high in stiffness.

Hereinafter, description will be made mainly on parts different from those in the embodiments described above, with reference to diagrams.

<FIG>, <FIG>, and <FIG> are schematic diagrams illustrating a concrete example of a creating method of the cylindrical structure <NUM> according to the seventh embodiment.

In <FIG>, a molding material <NUM> is disposed over the outer diameter surface of a mandrel jig <NUM>. <FIG> illustrates a concrete example of a B-B cross section illustrated in <FIG>. The configuration and a disposing procedure of the molding material <NUM> will be described below.

First, a cylindrical inner diameter-side outer layer <NUM> is provided over the outer diameter-side surface of the mandrel jig <NUM>. The cylindrical inner diameter-side outer layer <NUM> may be molded into a cylindrical shape beforehand using the mandrel jig <NUM>; however, in a case wherein the stiffness of the cylindrical inner diameter-side outer layer <NUM> is sufficiently small, the cylindrical inner diameter-side outer layer <NUM> molded into a planar shape beforehand may be shaped over the outer diameter-side surface of the mandrel jig <NUM>.

Next, an adhesive <NUM> is disposed over the surface of the cylindrical inner diameter-side outer layer <NUM>. As a method to dispose the adhesive <NUM>, for example, there exists a method to layer an adhesive <NUM> formed into a film shape that has not been cured on the surface of the cylindrical inner diameter-side outer layer <NUM>, or a method to apply an adhesive <NUM> in a viscous liquid form or a paste form to a surface of the cylindrical inner diameter-side outer layer. The curing temperature of the adhesive <NUM> is equal to or higher than either higher temperature of the curing temperatures of each of the adhesion portion <NUM> and the adhesion portion <NUM> that constitute the honeycomb core precursor <NUM>.

Then, the honeycomb core precursor <NUM> is shaped on the surface of the adhesive <NUM>.

Next, an adhesive <NUM> is disposed on the surface of the honeycomb core precursor <NUM>. As a method to dispose the adhesive <NUM>, for example, there exists a method to layer an adhesive <NUM> formed into a film shape that has not been cured on the surface of the honeycomb core precursor <NUM>, or a method to apply an adhesive <NUM> in a viscous liquid form or a paste form to the surface of the honeycomb core precursor <NUM>. The curing temperature of the adhesive <NUM> is equal to or higher than either higher temperature of the curing temperatures of each of the adhesion portion <NUM> and the adhesion portion <NUM> that constitute the honeycomb core precursor <NUM>.

Then, a cylindrical outer diameter-side outer layer <NUM> is disposed on the surface of the adhesive <NUM>. As a method to dispose the cylindrical outer diameter-side outer layer <NUM>, for example, there exists a method to shape a cylindrical outer diameter-side outer layer <NUM> molded in a C-shape beforehand on the surface of the adhesive <NUM>, or a method to shape the cylindrical outer diameter-side outer layer <NUM> molded in a planar shape beforehand on the surface of the adhesive <NUM> in a case wherein the stiffness of the cylindrical outer diameter-side outer layer <NUM> is small enough.

Next, a breather <NUM> is placed so as to cover the surface of a sandwich precursor <NUM> formed on the outer diameter-side surface of the mandrel jig <NUM> in the method as described above, and a suction opening <NUM> formed in the outer diameter surface of the mandrel jig <NUM>. The breather <NUM> is a material for ventilation inside a bag being molded, and glass fiber fabric or polyester mat, etc. is used as a raw material of the breather <NUM>. By performing sealing using the sandwich precursor <NUM>, the breather <NUM>, a bagging film <NUM> and a sealant <NUM>, and performing vacuum exhaustion from a vacuum tube <NUM> connected via the suction opening <NUM>, pressure is applied in the thickness direction of the sandwich precursor <NUM>, the cylindrical inner diameter-side outer layer <NUM> and the honeycomb core precursor <NUM> are adhered to each other via the adhesive <NUM>, and the cylindrical outer diameter-side outer layer <NUM> and the honeycomb core precursor <NUM> are adhered to each other via the adhesive <NUM>.

When it is difficult to form the suction opening <NUM> in the mandrel jig <NUM>, a vacuum jig <NUM> and the vacuum tube <NUM> may be connected in a method capable of retaining airtightness of the space sealed with the bagging film <NUM>, the sealant <NUM> and the mandrel jig <NUM>, by opening a vacuum suction hole <NUM> in the bagging film <NUM> as illustrated in <FIG>, surrounding the periphery of the vacuum suction hole <NUM> with the sealant <NUM>, and making the vacuum jig <NUM> adhere to the sealant <NUM>.

Then, the molding material <NUM> and the mandrel jig <NUM> are heated in a state of being applied the pressure by vacuum exhaustion as described above.

In the step above, by curing the adhesive <NUM>, the adhesive <NUM>, and the adhesion portion <NUM> and the adhesion portion <NUM> constituting the honeycomb core precursor <NUM>, a cylindrical structure <NUM> is created.

As described above, according to the present embodiment, the cylindrical structure <NUM> is created.

Further, according to the present embodiment, curing of adhesives to join an outer layer of a sandwich structure and the honeycomb core precursor <NUM>, and curing of high-temperature curing adhesives that constitute the honeycomb core precursor <NUM> are performed in one step.

<FIG>, <FIG>, and <FIG> are schematic diagrams illustrating a concrete example of a creating method of a cylindrical structure <NUM> according to an eighth embodiment.

In <FIG>, a molding material <NUM> is disposed on the outer diameter surface of the mandrel jig <NUM>. <FIG> illustrates a concrete example of a C-C cross section illustrated in <FIG>. The configuration and the disposal procedure of the molding material <NUM> will be described below.

First, an intermediate base material for an inner diameter-side outer layer <NUM> is layered on the outer diameter-side surface of the mandrel jig <NUM>. For the intermediate base material for the inner diameter-side outer layer <NUM>, for example, a prepreg wherein resin has permeated fiber in advance and semi-cured is used. The curing temperature of the resin of the intermediate base material for the inner diameter-side outer layer <NUM> is equal to or higher than either higher temperature of curing temperatures of each of an adhesion portion <NUM> and an adhesion portion <NUM> that constitute a honeycomb core precursor <NUM>.

Next, the honeycomb core precursor <NUM> is shaped on the surface of the honeycomb core precursor <NUM>.

Then, an intermediate base material for an outer diameter-side outer layer <NUM> is layered on the surface of the honeycomb core precursor <NUM>. For the intermediate base material for the outer diameter-side outer layer <NUM>, for example, a prepreg wherein resin has permeated fiber in advance and semi-cured is used. The curing temperature of the resin of the intermediate base material for the outer diameter-side outer layer <NUM> is equal to or higher than either higher temperature of the curing temperatures of each of the adhesion portion <NUM> and the adhesion portion <NUM> that constitute the honeycomb core precursor <NUM>. According to the method as described above, a mold release film <NUM> is placed so as to cover an exposed surface of the sandwich precursor <NUM> formed on the outer diameter-side surface of the mandrel jig <NUM>.

Next, a breather <NUM> is placed so as to cover the outer exposed surface of the mold release film <NUM> and a suction opening <NUM> formed in the outer diameter surface of the mandrel jig <NUM>. The breather <NUM> is the same as the breather <NUM> according to the seventh embodiment. By performing sealing of the whole of the sandwich precursor <NUM> and the breather <NUM> using a bagging film <NUM> and a sealant <NUM>, and performing vacuum exhaustion from a vacuum tube <NUM> connected via the suction opening <NUM>, pressure is applied in the thickness direction of the sandwich precursor <NUM>, the intermediate base material for the inner diameter-side outer layer <NUM> and the honeycomb core precursor <NUM> are adhered to each other, and the intermediate base material for the outer diameter-side outer layer <NUM> and the honeycomb core precursor <NUM> are adhered to each other. <FIG> illustrates a countermeasure for a case wherein it is difficult to form a suction opening <NUM> in the mandrel jig <NUM>. <FIG> is equivalent to <FIG>.

Next, a molding material <NUM> and the mandrel jig <NUM> are heated while being applied the pressure by vacuum exhaustion as described above.

In the step above, by curing the intermediate base material for the inner diameter-side outer layer <NUM>, the intermediate base material for the outer diameter-side outer layer <NUM>, and the adhesion portion <NUM> and the adhesion portion <NUM> constituting the honeycomb core precursor <NUM>, a cylindrical structure <NUM> is created.

As described above, according to the present embodiment, a cylindrical structure <NUM> is created.

Claim 1:
A ribbon laminated body (<NUM>) used for creating a honeycomb core (<NUM>), the ribbon laminated body (<NUM>) comprising:
- a multilayer ribbon wherein a plurality of layers of ribbons (<NUM>) are laminated;
- a low-temperature curing adhesion portion constituted by a low-temperature curing adhesive; and
- a high-temperature curing adhesion portion constituted by a high-temperature curing adhesive that is cured at a temperature higher than a temperature at which the low-temperature curing adhesive is cured,
wherein
- in the multilayer ribbon, the plurality of layers of ribbons (<NUM>) are laminated so that two long sides included in each ribbon (<NUM>) are aligned with one another,
- in the multilayer ribbon, between each two ribbons (<NUM>) adjacent to each other, the low-temperature curing adhesion portion that adhesively bonds both of the two ribbons (<NUM>), which is in contact with the both of the two ribbons (<NUM>), and the high-temperature curing adhesion portion which is in contact with the both of the two ribbons (<NUM>) exist,
- in a part where the low-temperature curing adhesion portion is in contact with each of the two ribbons (<NUM>), a shape of the low-temperature curing adhesion portion is a trapezoidal shape having an upper base, a lower base longer than the upper base, and two oblique sides, wherein an angle formed by the upper base and each of the two oblique sides is an obtuse angle, and wherein at least a part of the upper base is overlapped with a part of one of the two long sides of each of the two ribbons (<NUM>), and at least a part of the lower base is overlapped with a part of the other of the two long sides of each of the two ribbons (<NUM>),
- the low-temperature curing adhesion portion is cured, and the high-temperature curing adhesion portion is not cured,
- in a portion where the high-temperature curing adhesion portion is in contact with each of the ribbons (<NUM>), a part of a periphery of the high-temperature curing adhesion portion is in contact with at least a part of one of the two oblique sides included in one of the low-temperature curing adhesion portions.