JP2018030242A - Insulation body, production method therefor, rocket motor, and heat storage layer forming body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an insulation body provided on an inner wall surface that covers an internal space where combustion gas is generated or flows and the temperature rise of the inner wall surface due to the combustion gas can be reduced or delayed.SOLUTION: The insulation body 10 for providing on the inner wall surface 3b covering an internal space 3a where combustion gas is generated or flowing has a first layer 10a and a second layer 10b. The second layer 10b is disposed between the first layer 10a and the inner wall surface 3b. In the second layer 10b, the heat capacity of at least any of the unit volume and the whole is larger than that of the first layer 10a.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an insulation body that suppresses heat transfer from high-temperature combustion gas and a method for manufacturing the same. The present invention also relates to a rocket motor having such an insulation body. Furthermore, this invention relates to the thermal storage layer formation body which can be used for such an insulation body.

  Since the space where the combustion gas is generated or flows becomes high temperature (for example, 1000 ° C. or higher or 3000 ° C. or higher), by providing an insulation body (heat insulating material) on the inner wall surface covering this space, the inner wall surface is thermally heated. Protect. Such an inner wall surface includes an inner wall surface of a motor case provided in the rocket motor.

  The rocket motor generates and ejects a solid propellant combustion gas. In one example, the rocket motor is provided in a rocket for launching an artificial satellite, and the rocket is propelled by the combustion gas ejected.

  The rocket motor has a motor case having an internal space in which a propellant is provided. The propellant generates high-temperature and high-pressure combustion gas when ignited. This combustion gas is ejected to the outside from a nozzle provided in the motor case.

  In order to suppress such heat transfer from the combustion gas to the motor case, the insulation body is attached to the inner wall surface of the motor case. Thereby, the motor case is protected from high-temperature combustion gas. Such an insulation body is described, for example, in Patent Documents 1 and 2 below.

Patent No. 4,587767 Japanese Patent No. 5342369

  It is desirable to further reduce or delay the motor case temperature rise. For example, when the operation time of the rocket motor is made longer or when the rocket motor is a two-stage thrust type rocket motor as described below, it is desired to reduce or delay the temperature rise of the motor case.

  In the two-stage thrust type rocket motor, the internal space of the motor case is separated into two spaces by a partition wall, and two propellants are provided in each space. One propellant is ignited and burned, and when the set time has elapsed after the completion of the combustion, the other propellant is ignited. In this case, even if the propellant is not burned during the set time, the internal space of the motor case is at a high temperature (for example, 3000 ° C. or higher), so the set time and the burn time of each propellant It is desired to protect the motor case from the high temperature of the internal space over a long period of time.

Accordingly, a first object of the present invention is an insulation body provided on an inner wall surface that covers an internal space where combustion gas is generated or flows, and further reduces or delays the temperature rise of the inner wall surface caused by the combustion gas. It is to provide an insulation body that can be produced and a method for producing the same.
The second object of the present invention is to provide a rocket motor having such an insulation body.
Furthermore, the third object of the present invention is to provide a heat storage layer forming body that can be used for such an insulation body.

In order to achieve the first object described above, according to the present invention, an insulation body is provided for an inner wall surface covering an internal space where combustion gas is generated or flows,
A first layer, and a second layer disposed between the first layer and the inner wall surface,
The second layer is provided with an insulation body having a heat capacity of at least one of a unit volume and the whole larger than that of the first layer.

According to the present invention, the first layer having a relatively small heat capacity is positioned on the inner space side where the combustion gas exists, and the second layer having a relatively large heat capacity is positioned on the inner wall surface side to be protected. Insulation bodies can be used.
Since the first layer on the inner space side has a function of protecting the second layer, the second layer having a relatively large heat capacity stores heat from the inner space until the first layer is decomposed and eliminated by the combustion gas. Thereby, the temperature rise of an inner wall surface can be reduced or delayed.

  The above-described insulation body is preferably configured as follows.

  The second layer has a lower density than the first layer. Thereby, the performance fall of the rocket motor by the mass increase is prevented.

  The first layer has higher heat resistance than the second layer. Thereby, the first layer with high heat resistance can earn time until the first layer is decomposed by the combustion gas and disappears. Therefore, in the meantime, the second layer can suppress the temperature rise of the inner wall surface by exhibiting the function of storing heat from the internal space.

  The second layer includes a resin that contributes to its heat capacity.

  The second layer can exhibit a function of storing heat from the internal space by having a resin having a relatively large heat capacity and a light weight.

The first layer has an elastomer and a first filler,
The second layer has an elastomer and a second filler containing the resin.

  The mass of the resin occupies 50% or more of the total mass of the second layer. Thereby, the heat capacity of the second layer can be sufficiently increased.

  The first filler of the first layer is aramid fiber.

  In order to achieve the second object, according to the present invention, a rocket including a motor case provided with a propellant in an internal space and the above-described insulation provided on an inner wall surface of the motor case. A motor is provided.

Further, in order to achieve the third object described above, according to the present invention, a heat storage layer forming body for constituting an insulation body provided on an inner wall surface covering an internal space where combustion gas is generated or flows,
At the time of use, it becomes the second layer among the first layer and the second layer of the insulation body, and is disposed between the first layer and the inner wall surface,
A heat storage layer forming body in which the heat capacity of at least one of the unit volume and the whole is larger than that of the first layer is provided.

  In order to achieve the above third object, according to the present invention, a heat storage layer forming body including an elastomer and a filler including a resin is provided.

In order to achieve the above first object, according to the present invention, there is provided a method of manufacturing an insulation body for providing an inner wall surface covering an internal space where combustion gas is generated or flows.
(A) A first composition is produced by mixing the elastomer, the first filler, and the additive,
(B) A first layer sheet is produced by forming the first composition into a sheet,
(C) A second composition is produced by mixing an elastomer, a second filler containing a resin, and an additive,
(D) A second layer sheet is produced by forming the second composition into a sheet,
(E) A method for manufacturing an insulation body is provided, in which an insulation body is obtained by laminating a first layer sheet and a second layer sheet.

  According to the present invention, the insulation body provided on the inner wall surface covering the internal space where the combustion gas is generated or flows has the first layer and the second layer. The first layer arranged on the inner space side can protect the second layer until the first layer is decomposed by the combustion gas and disappears. Meanwhile, the second layer having a relatively large heat capacity stores heat from the internal space and suppresses heat transfer to the inner wall surface. Thereby, the temperature rise of an inner wall surface can be reduced or delayed.

1 shows a rocket motor and an insulation body provided thereon according to an embodiment of the present invention. It is a flowchart which shows the manufacturing method of the insulation body by embodiment of this invention. (A) is a graph which shows the density of an Example and Reference Examples 1-3, (B) is a graph which shows the heat capacity of an Example and Reference Examples 1-3. (A) is a graph which shows the heat-transfer analysis result at the time of attaching each laminated body which used the layer of an Example and each of Reference Examples 1-3 to the inner surface of a motor case, (B) is each laminated body. It is a graph which shows the heat-transfer analysis result of. The two-stage thrust type rocket motor provided with the insulation body by embodiment is shown.

  Embodiments of the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected to the common part in each figure, and the overlapping description is abbreviate | omitted.

  FIG. 1A shows a configuration of a rocket motor 20 according to an embodiment of the present invention. The rocket motor 20 generates combustion gas of the solid propellant 5 and ejects it. The rocket motor 20 is provided on a rocket (for example, an artificial satellite launch rocket), a defense rocket bullet, or a missile, and propels them by the combustion gas ejected. Alternatively, the rocket motor 20 is provided in a rocket (for example, a rocket for observation) or an artificial satellite, and changes the posture of the rocket motor 20 by the combustion gas ejected.

  The rocket motor 20 includes a motor case 3, a solid propellant 5, an ignition device 7, a nozzle 9, and an insulation body 10. A propellant 5 is provided in the internal space 3a of the motor case 3 (that is, the combustion chamber 3a). When the ignition device 7 ignites the propellant 5, high-temperature combustion gas is generated from the propellant 5. This combustion gas is ejected from the nozzle 9.

  The insulation body 10 has a sheet shape in the present embodiment. In this embodiment, the insulation body 10 is a heat insulating material provided on the inner wall surface 3b of the motor case 3 as shown in FIG. The insulation body 10 is provided to protect the motor case 3 from the high temperature (in the example, about 3000 ° C.) of the combustion chamber 3 a due to the combustion of the propellant 5.

  FIG. 1B is an enlarged view of a portion B surrounded by a broken line in FIG. The insulation body 10 includes a first layer 10a and a second layer 10b. The first layer 10a is provided on the inner space 3a side, and the second layer 10b is provided on the inner wall surface 3b side, and is located between the first layer 10a and the inner wall surface 3b. For example, the second layer 10b is attached to the inner wall surface 3b.

  The first layer 10a has higher heat resistance than the second layer 10b. The heat resistance means a property having less at least one of decomposition, deterioration, deformation, and softening (for example, decomposition) due to heat. In this embodiment, the 1st layer 10a is comprised from the elastomer, the 1st filler, and the additive. This elastomer has a function as a binder. This elastomer may be cross-linked. The first filler has a function of improving mechanical properties and heat resistance (for example, a property of reducing thermal decomposition). Here, the mechanical property means a property that suppresses the shape change of the first layer 10a due to the flow or pressure of the combustion gas, for example (the same applies hereinafter).

  The elastomer of the first layer 10a may be natural rubber, synthetic rubber, or a mixture of both. Specific examples of this elastomer include an ethylene-propylene-diene terpolymer having an unsaturated bond and capable of crosslinking, natural rubber having a polyisoprene structure, and a chemical synthesis having the same polyisoprene structure as natural rubber. Isoprene rubber, and acrylonitrile butadiene rubber which is a copolymer of acrylonitrile and butadiene. The elastomer of the first layer 10a may be any of these specific examples or a mixture of two or more of these specific examples.

  The first filler may be a reinforcing fiber, carbon black, asbestos, granular silica, or a mixture thereof. The reinforcing fiber is an aramid fiber (that is, an aromatic polyamide fiber) in a preferred example, but may be an aromatic polyamide-based pulp fiber (pulp-like aramid fiber), carbon fiber, glass fiber, or other fiber. . The reinforcing fiber may be a mixture of a plurality of types of fibers described above.

  Specific examples of the additive for the first layer 10a include a crosslinking compounding agent for forming chain rubber molecules into a three-dimensional structure, and adjusting the hardness of the rubber product to improve kneadability and processability. There are softeners and plasticizers, anti-aging agents to prevent rubber deterioration, and processing aids and tackifiers to improve processability during rubber kneading and rolling and to obtain appropriate tackiness. . The additive of the first layer 10a may be any of these specific examples, or a mixture of two or more of these specific examples.

The second layer 10b has a heat capacity of at least one of the unit volume and the whole larger than that of the first layer 10a. In one example, the heat capacity of the unit volume of the second layer 10b is larger than the heat capacity of the unit volume of the first layer 10a. In another example, the overall heat capacity of the second layer 10b is greater than the overall heat capacity of the first layer 10a. In another example, the heat capacity of the unit volume of the second layer 10b is larger than the heat capacity of the unit volume of the first layer 10a, and the total heat capacity of the second layer 10b is the total heat capacity of the first layer 10a. Bigger than. The second layer 10b has a resin that contributes to its heat capacity.
The second layer 10b has a lower density than the first layer 10a.
The second layer 10b is made of resin so that the heat capacity is larger and the density is lower than that of the first layer 10a. This resin may be, for example, a phenol resin or a polyamide resin, but may be another resin.

  The resin constituting the second layer 10b preferably occupies 50% or more of the second layer 10b by weight. In a preferred example, the main material of the second layer 10b is a resin. Here, the main material means a material having the highest mass ratio among the materials forming the second layer 10b.

  In the present embodiment, the second layer 10b is composed of an elastomer, a second filler containing the above-described resin, and an additive.

  The elastomer of the second layer 10b has a function as a binder. The elastomer of the second layer 10b may be natural rubber, synthetic rubber, or a mixture of both. The elastomer of the second layer 10b may be any of the above specific examples of the elastomer of the first layer 10a, or a mixture of two or more of the above specific examples.

  The material having the highest mass ratio among the materials forming the second filler is the above-described resin. The resin of the second filler has a function of giving a heat capacity to the second layer 10b. The second filler may contain other materials that improve the above-described mechanical properties (strength) and heat resistance. This other material preferably does not include the above-mentioned reinforcing fibers that tend to cause voids between the fibers. Thereby, the 2nd layer 10b does not have a space | gap in the inside. Therefore, it is possible to prevent the heat capacity of the second layer 10b from being reduced by the gap. The other material of the second filler is, for example, carbon black.

  FIG. 2 is a flowchart showing a method for manufacturing the insulation body 10 of the present embodiment described above.

  This manufacturing method includes steps S1 to S3.

  In step S1, the first layer sheet as the first layer 10a described above is produced. Step S1 has steps S11 and S12.

In step S11, the first composition is obtained by mixing the above-described elastomer, the first filler, and the additive as the material of the first layer 10a. Step S11 is performed as follows, for example.
First, a 1st filler, an additive, and the solid elastomer which can be bridge | crosslinked are knead | mixed with a mixer. An additive (crosslinking agent) is added to the kneaded material as described above, and the mixture is kneaded with a kneader. Thereby, the first composition for the first layer 10a is obtained.

  In step S12, a first layer sheet is obtained by forming the first composition into a sheet. For example, the first layer sheet is produced by passing the first composition through a calender roll machine.

  In step S2, the second layer sheet as the second layer 10b described above is acquired. Step S2 has step S21 and step S22.

In step S21, the second composition is obtained by mixing the above-described elastomer, the second filler containing resin, and the additive as the material of the second layer 10b. A preferable form of the elastomer and the second filler to be mixed at this time is a fine powder or a large number of strips. Step S21 is performed as follows, for example.
First, the second filler, the additive and the crosslinkable solid elastomer are kneaded with a mixer. An additive (crosslinking agent) is added to the kneaded material as described above, and the mixture is kneaded with a kneader. Thereby, the second composition for the second layer 10b is obtained.

  In step S22, a second layer sheet is obtained by forming the second composition into a sheet. For example, the second layer sheet is produced by passing the second composition through a calender roll machine.

  In step S3, the insulation body 10 is obtained by laminating the first layer sheet and the second layer sheet. In the insulation body 10, the first layer sheet and the second layer sheet are bonded to each other (for example, by an adhesive). For example, the insulation body 10 is obtained by sticking the surface of the first layer sheet and the surface of the second layer sheet to each other. The first layer sheet and the second layer sheet are the first layer 10a and the second layer 10b described above, respectively.

  In addition, the said elastomer of a 1st layer sheet and a 2nd sheet is bridge | crosslinked by heating a 1st layer sheet and a 2nd sheet | seat at an appropriate timing.

(Heat storage layer forming body)
The second layer 10b described above is a heat storage layer forming body according to an embodiment of the present invention. The heat storage layer forming body 10b constitutes the insulation body 10 described above. The heat storage layer forming body 10b can be manufactured independently of the first layer 10a (for example, by the above-described step S2). When the heat storage layer forming body 10b is used as a component of the insulation body 10, that is, when the insulation body 10 is provided on the inner wall surface 3b, the first layer 10a and the second layer 10b of the insulation body 10 The second layer 10b is disposed between the first layer 10a and the inner wall surface 3b.

(Effect of embodiment)
The insulation body 10 according to the present embodiment includes a first layer 10a having a relatively high heat resistance and a second layer 10b having a relatively large heat capacity. The insulation body 10 is attached to the inner wall surface 3b so that the first layer 10a is positioned on the inner space 3a side and the second layer 10b is positioned on the inner wall surface 3b side.
The first layer 10a having a relatively high heat resistance protects the second layer 10b from the combustion gas until it is thermally decomposed by the combustion gas and disappears. Therefore, until the first layer 10a disappears, the second layer 10b having a relatively large heat capacity can reduce or delay the temperature rise of the motor case 3 by storing heat from the combustion gas.

As a result, for example, the following (1) and (2) can be realized.
(1) Insulation body 10 of this embodiment which has the 1st layer 10a and the 2nd layer 10b compared with the case where the insulation body (henceforth a single layer insulation body) which consists only of the 1st layer 10a is used. The operation time of the rocket motor 20 can be extended when using.
(2) The motor case 3 can be thermally protected by the insulation body 10 of the present embodiment that is thinner than the single-layer insulation body.

  In addition, since the low-density resin is used as the material of the second layer 10b that increases the heat capacity, the light riser 10 can reduce or delay the temperature rise of the motor case 3.

  The following [Table 1] shows the composition of the second layer 10b of the above-described embodiment and the layers of Reference Examples 1 to 3.

  In Table 1, EPDM represents ethylene / propylene / diene rubber, and NR represents natural rubber. In Table 1, the blending ratio indicates the number of parts (per hindered rubber). That is, the compounding ratio indicates the ratio of the mass of each material when the total mass of the elastomer is 100.

  3A and 3B are graphs showing the density and heat capacity (heat capacity per unit volume) of the second layer 10b of the example and the layers of Reference Examples 1 to 3, respectively. 3A and 3B, the value in the case of the first layer 10a described above is set as a reference (that is, 1). Each density and heat capacity data in FIGS. 3A and 3B is for only one layer.

As shown in FIGS. 3A and 3B, the second layer 10b of the example has a density as low as that of the layers of Reference Examples 1 and 2 and has a heat capacity significantly larger than that of Reference Examples 1 and 2. (A little less than twice that of Reference Example 1). Therefore, when the same heat capacity as that of the layers of Reference Examples 1 and 2 is achieved, the thickness of the second layer 10b of the example can be reduced to about half of the thickness of the layers of Reference Examples 1 and 2.
In Reference Example 3 using alumina as the filler, the density is increased. As can be seen from FIGS. 3A and 3B, the second layer 10b using a resin as a filler can achieve both a low density and a large heat capacity. On the other hand, in general hollow particles (Reference Example 2) and alumina blended products (Reference Example 3) for heat insulation, both low density and large heat capacity cannot be achieved.

  FIG. 4A is a graph showing a heat transfer analysis result when a laminate in which two layers having the same thickness are laminated is attached to the inner wall surface 3 b of the motor case 3. Each data in FIG. 4 (A) is, in order from the left side, when the laminated body is composed of two first layers 10a, when the laminated body is composed of the first layer 10a and the second layer 10b (that is, the insulation body 10). In the case of Example), when the laminate is composed of the first layer 10a and the layer of Reference Example 1, when the laminate is composed of the first layer 10a and the layer of Reference Example 2, the laminate is the first layer 10a and Reference Example. A case of 3 layers is shown. Each laminate was attached to the inner wall surface 3b with the first layer 10a facing the internal space 3a. In the analysis of FIG. 4 (A), the thickness of each laminated body was made the same.

  The result of FIG. 4 (A) was obtained by making the heat-transfer conditions with respect to each laminated body the same. That is, the heat transfer by the combustion gas (about 3500 ° C.) of the solid propellant and the radiant heating from the structural member inside the rocket motor that became a high temperature were simulated for each laminate. The data of each laminate in FIG. 4A is for 320 seconds after the start of combustion of the solid propellant.

As shown in the graph of FIG. 4A, a laminate of two first layers 10a, a laminate of the first layer 10a and the layer of Reference Example 1, and a laminate of the first layer 10a and the layer of Reference Example 2 Then, the temperature of the motor case 3 was 133 ° C. or higher, whereas in the example, the temperature of the motor case 3 was 121 ° C. That is, in the embodiment, the temperature rise of the motor case 3 can be suppressed.
4A, in the case of the laminated body of the first layer 10a and the reference example 3, the temperature of the motor case 3 is lower than that in the example, but the density of the layer of the reference example 3 is It is larger than twice the density of the two layers 10b. Therefore, in consideration of the weight, the example is more advantageous than the laminate of the first layer 10a and the reference example 3.

  FIG. 4B is a graph showing more detailed data of the heat transfer analysis result in each case in FIG. In FIG. 4B, the horizontal axis indicates the time from the start of combustion of the solid propellant, and the vertical axis indicates the temperature of the motor case 3. In FIG. 4B, a broken line graph indicates a case where the stacked body is formed of two first layers 10a, and a solid line graph indicates a case where the stacked body is formed of the first layer 10a and the second layer 10b (that is, implementation). In the case of the example, the one-dot chain line graph shows the case where the laminate is composed of the first layer 10a and the layer of Reference Example 1, or the layer composed of the first layer 10a and the layer of Reference Example 2 (the graph in these two cases). The two-dot chain line graph shows a case where the laminate is composed of the first layer 10a and the layer of Reference Example 3.

  As shown in the graph of FIG. 4B, in the embodiment, the temperature of the motor case 3 can be suppressed to 100 ° C. or less for about 150 seconds from the start of combustion. On the other hand, when only the first layer 10a is used and when the layers of Reference Examples 1 and 2 are used, the temperature of the motor case 3 is about 110 ° C. when 150 seconds have elapsed.

  The present invention is not limited to the above-described embodiments, and various changes can be made within the scope of the technical idea of the present invention. For example, any one of the following modification examples 1 to 3 may be employed alone, or two or more of modification examples 1 to 3 may be arbitrarily combined and employed. In this case, the points not described below are the same as described above.

(Modification 1)
FIG. 5 shows a two-stage thrust type rocket motor 30 provided with the insulation body 10 described above. The two-stage thrust type rocket motor 30 includes a motor case 3, solid first and second propellants 5 a and 5 b, a partition wall 6, first and second ignition devices 7 a and 7 b, a nozzle 9, and an insulation body 10. Is provided.

  The partition 6 isolates the internal space 3a of the motor case 3 into two spaces. The first and second propellants 5a and 5b are respectively provided in two spaces separated by a partition wall 6. The first and second ignition devices 7a and 7b ignite the first and second propellants 5a and 5b, respectively. The first ignition device 7a ignites and burns one propellant 5a, and when the set time elapses after the combustion ends, the second ignition device 7b ignites and burns the other propellant 5b. Let

  The internal space 3a becomes a high temperature (for example, 3000 ° C. or more) over a long period of time that is a combination of the set time and the combustion time of the propellants 5a and 5b. The insulation body 10 described above is also suitable for protecting the motor case 3 over this long time.

(Modification 2)
The insulation body 10 may be provided on an inner wall surface that covers an internal space where combustion gas is generated or flows.

(Modification 3)
In the above-described embodiment, the insulation body 10 may or may not include layers other than the first layer 10a and the second layer 10b. When the insulation body 10 includes layers other than the first layer 10a and the second layer 10b, the positional relationship between the first layer 10a and the second layer 10b is the same as described above.

3 Motor case, 3a inner space (combustion chamber), 3b inner wall surface, 5, 5a, 5b propellant, 6 partition, 7, 7a, 7b ignition device, 9 nozzle, 10 insulation body, 10a first layer, 10b first 2 layers (heat storage layer forming body), 20, 30 Rocket motor

Claims (11)

An insulation body for providing on an inner wall surface covering an internal space where combustion gas is generated or flows,
A first layer, and a second layer disposed between the first layer and the inner wall surface,
The said 2nd layer is an insulation body whose heat capacity about at least any one of a unit volume and the whole is larger than the said 1st layer.   The insulation body according to claim 1, wherein the second layer has a density lower than that of the first layer.   The insulation body according to claim 1, wherein the first layer has higher heat resistance than the second layer.   The insulation body according to any one of claims 1 to 3, wherein the second layer includes a resin that contributes to a heat capacity thereof. The first layer has an elastomer and a first filler,
The insulation body according to claim 4, wherein the second layer has an elastomer and a second filler containing the resin.   The insulation body according to claim 4 or 5, wherein the mass of the resin occupies 50% or more of the total mass of the second layer.   The insulation body according to claim 5, wherein the first filler of the first layer is an aramid fiber.   A rocket motor comprising a motor case in which a propellant is provided in an internal space, and the insulation body according to any one of claims 1 to 7 provided on an inner wall surface of the motor case. A heat storage layer forming body for constituting an insulation body provided on an inner wall surface covering an internal space where combustion gas is generated or flows,
At the time of use, it becomes the second layer among the first layer and the second layer of the insulation body, and is disposed between the first layer and the inner wall surface,
A heat storage layer forming body in which the heat capacity of at least one of the unit volume and the whole is larger than that of the first layer.   A heat storage layer forming body comprising an elastomer and a filler containing a resin. A method of manufacturing an insulation body for providing an inner wall surface covering an internal space where combustion gas is generated or flows,
(A) A first composition is produced by mixing the elastomer, the first filler, and the additive,
(B) A first layer sheet is produced by forming the first composition into a sheet,
(C) A second composition is produced by mixing an elastomer, a second filler containing a resin, and an additive,
(D) A second layer sheet is produced by forming the second composition into a sheet,
(E) The manufacturing method of the insulation body which obtains an insulation body by laminating | stacking a 1st layer sheet | seat and a 2nd layer sheet | seat mutually.

Images