JPH0324941A - Hollow structural body and preparation thereof - Google Patents

Abstract

PURPOSE:To obtain a lightweight hollow structural body having high rigidity and excellent heat insulating effect by constituting said structural body of a honeycomb material having a hollow part formed therein and forming a core by its peripheral wall and the face materials covering both inner and outer surfaces of the honeycomb material. CONSTITUTION:In preparing a hollow structural body A, at first, in a winding process of an inside face material 5, a material composed of a reinforcing fiber selected from a tape material 50, a sheet material 51 and a yarn material 52 is delivered to be passed through a resin tank 53 and impregnated with a resin 54 while the impregnated material is wound around a mandrel M so as to form a surface. Next, in a winding process of an inside adhesive member 3, a base material 30 composed of paper or a nonwoven fabric is delivered to be passed through a resin tank 31 to be impregnated with a resin 32 and the impregnated one is wound around the inside face material 5. Subsequently, a honeycomb material 2 is wound around the inside adhesive member 3 and an outside adhesive member 4 is wound around the honeycomb material 2. Further, an outside face material 6 is wound around the outside adhesive member 4 and the whole is cured in a heating oven or at room temp. and the hollow structural body is demolded from the mandrel M.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a hollow structure used for the body of a cargo loading section of a refrigerated truck or a refrigerated truck, an air conditioning duct, or the frame of a container. Technology) Conventionally, for example, the peripheral wall of the cargo loading part of a refrigerated truck or a refrigerated truck has been made of a foamed material such as urethane foam as a core.
A structure in which both the front and back sides were sandwiched between aluminum panels was used.

In this case, gaps are likely to occur between the walls, and in order to connect the walls, a member that constitutes a metal frame is required at that part, and the external There was a problem with heat retention due to the heat being transferred, and it also took a lot of effort to make sure the walls were in close contact with each other so that there were no gaps between them.

Therefore, in order to solve such problems, it is conceivable to form a hollow structure with a peripheral wall having a seamless integral structure.

As such a hollow structure, for example, industrial material 19
87. VOL. 35, NO. 7 (May 2, 1986)
0, published by Nikkan Kogyo Shimbun), page 191, is known.

This conventional hollow structure is formed by the filament winding ink method, in which resin-attached glass fiber is wound around a mandrel and cured, and then the mandrel is removed from the mold.The surrounding wall is made of glass fiber-reinforced plastic ( It is integrally formed from FRP.

(Problem to be solved by the invention) However, in the conventional hollow structure described above,
It has a high specific gravity due to the high proportion of glass fiber (50%).

Therefore, there is a problem in that increasing the thickness of the peripheral wall in order to ensure the necessary rigidity results in an increase in weight.

Further, since the peripheral wall is made of FRP, it cannot be said to have an excellent heat insulating effect, and there is a problem in that it is unsuitable for use with heat insulating properties.

The present invention has been made in view of the above-mentioned conventional problems, and aims to provide a hollow structure that is lightweight, highly rigid, and has an excellent heat insulating effect, and a method for manufacturing the same.

(Means for Solving the Problem) In order to achieve the above-mentioned object, the hollow structure of the present invention has the following features:
A hollow part is formed inside surrounded by a peripheral wall, and the peripheral wall is
The means is formed by a honeycomb material forming a core and face materials covering both the inner and outer surfaces of the honeycomb material.

Further, in the present invention, when manufacturing this hollow structure, the inner wall material is wound around a mandrel, and then an adhesive layer is interposed between the inner wall material and the honeycomb material is placed over the inner wall material. Next, an adhesive layer is interposed between the surface of the honeycomb material, and an outer surface material is wrapped and adhered from above the honeycomb material.Finally, after the adhesive layer is cured, the laminated state is obtained. It was decided to demold the honeycomb material and the inner and outer materials from the mandrel.

(Function) In the present invention, first, the inner surface material is wound around the mandrel,
Next, the honeycomb material is wrapped and bonded onto the inner wall material with an adhesive layer interposed therebetween. Note that this adhesive layer may be formed in advance before wrapping the inner wall material, or it may be formed on the outer surface of the inner wall material or the back surface of the honeycomb material after the inner wall material is wrapped. good.

Next, the outer surface material is wrapped and bonded onto the honeycomb material with an adhesive layer interposed therebetween. In this case as well, the adhesive layer may be formed on the surface of the honeycomb material before the honeycomb material is wrapped, or it may be formed on the surface of the honeycomb material or the back surface of the outer surface material after the honeycomb material is wrapped. good.

Finally, after the adhesive layer is cured, the laminated honeycomb material and inner and outer materials are removed from the mandrel to form a hollow structure.

In this way, a hollow structure is formed using the inner and outer materials with the honeycomb material as the core, but instead of first laminating the honeycomb material and the inner and outer materials and then forming the hollow structure, the hollow structure is formed by winding it around a mandrel. Even if there is a circumference difference between the outside and the outside of the honeycomb material, there will be no slippage between the adhesive surfaces between the honeycomb material and the double-sided materials, and the material will be laminated while minimizing deformation of the inside and outside of the honeycomb material. can do.

Moreover, since the honeycomb material and the double-sided materials are laminated while being wrapped, no seams are formed on the peripheral wall.

Further, the hollow structure of the present invention has an air layer formed of the honeycomb material, and therefore has excellent heat insulation properties.

(Example) Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. I is a sectional view showing a hollow structure A according to an embodiment of the present invention. This hollow structure A is used, for example, as a refrigerated chamber of a refrigerated automobile, and a hollow portion 10 of approximately Jfg is formed inside. has been done.

Reference numeral 1 in the figure indicates a peripheral wall, and FIG. 2 shows a partially enlarged view of the peripheral wall.

This peripheral wall 1 is formed by using the honeycomb material 2 as a core and adhering an inner wall material 5 and an outer wall material 6 to the inner and outer surfaces of the honeycomb material 2 through an inner adhesive member 3 and an outer adhesive member 4 as adhesive layers. There is.

The honeycomb material 2 has a well-known structure in which a large number of cells each having a hexagonal cross-section are arranged in series vertically and horizontally, and is made of, for example, an aluminum plate, paper, plate, etc. It is formed from a plate material such as an aramid resin plate.

The inner and outer adhesive members 3.4 are made of a permeable base material impregnated with resin. For example, the base material may be paper or nonwoven fabric (polyester resin, vinylon resin, etc.).
The resin used is a mixture of unsaturated polyester and rigid urethane foam system material in a range of 3:l to 6:l (weight ratio). Note that both adhesive members 3.4 are for bonding the inner and outer surfaces 5.6 to the honeycomb material 2,
Instead of both adhesive members 3.4, an adhesive layer may be formed by simply applying an adhesive to these parts. The inner and outer surfaces 5.6 are formed of FRP boards made by impregnating reinforcing fibers with resin. For example, the reinforcing fibers may include glass. carbon. Aramid. A fiber material such as polyacrylate is used, and a thermosetting resin such as unsaturated polyester or epoxy is used as the resin.

Next, a method for manufacturing the hollow structure A will be explained step by step.

This manufacturing method includes a step of wrapping the inner side material 5 (FIG. 3), a step of wrapping the inner adhesive member 3 (FIG. 4), a step of wrapping the honeycomb material 2 (FIGS. 6 to 9), The steps of wrapping the external adhesive member 4, wrapping the outer surface material 6, curing, and demolding are performed in this order.

First, in the process of wrapping the inner side material 5, as shown in FIG.
2 is passed through the resin 153 while being fed out to be impregnated with the resin 54, and this is wound around the mandrel M so as to form a surface.

Next, in the step of winding the inner blue member 3, as shown in FIG. Wrap it around the top of the facing material 5.

The process of wrapping the inner adhesive member 3 may be performed simultaneously with the process of wrapping the inner side member 5, as shown in FIG.

In the subsequent step of wrapping the honeycomb material 2, the honeycomb material 2 is wound from above the inner adhesive member 3, and there are three methods as shown in FIGS. 6 to 9, for example.

In the method shown in FIG. 6, a tape-shaped honeycomb material 2 is stretched and wound in a spiral manner.

Further, in the method shown in FIG. 7, a wide honeycomb material 2 corresponding to the length of the mandrel M is stretched and wrapped around the entire honeycomb material.

In the case of the method shown in FIGS. 6 and 7, as shown in FIG. I wrap it so that it looks like this.

This is a deformation prevention means to prevent the cells of the honeycomb material 2 from opening as the honeycomb material 2 is wound.

In addition, the method shown in FIG. 9 involves forming the unexpanded honeycomb block 2 shown in (a) into a cylindrical shape by bonding the end faces in the expanding direction as shown in (b), and then forming the unexpanded honeycomb block 2 shown in (c) Then, this is wrapped around the inner wall material 5 so as to cover it from one end side of the mandrel M on which the inner wall material 5 and the inner adhesive member 3 have been wound beforehand, and in this wrapped state, it is in an expanded state. . In this case, since the unexpanded honeycomb block 2 expands by nearly 170% when expanded, the length of the honeycomb block 2 is determined by taking this elongation rate into account.

The honeycomb material 2 can be processed in various ways before being expanded, as shown in Fig. 10. In the figure, the (A) part is an example where the grooves 21 are cut, and the (mouth) part is an example where the grooves 21 are cut. 22 is cut, and part (c) is an example in which another member 23 is inserted. In the next step of wrapping the outer adhesive member 4, the outer adhesive member 4 is wound over the honeycomb material 2 in the same manner as the wrapping step of the inner adhesive member 3.

Furthermore, in the subsequent step of wrapping the outer surface material 6, the outer surface material 6 is wound over the outer adhesive member 4 in the same manner as the step of wrapping the inner surface material 5.

Next, in the curing step, the resin used in each step described above is cured, and may be cured using a heating furnace or the like, or may be cured at room temperature.

The mold removal step is the final step, and by removing the mold from the mandrel M after the curing step, a hollow structure A having a hollow portion 10 formed therein is molded.

The hollow structure A formed as described above is
The peripheral wall 1 has a sandwich structure with the honeycomb material 2 as a core sandwiched between inner and outer FRP materials 5.6, making it lightweight and highly rigid, and the air layer of the honeycomb material 2 provides excellent heat insulation effect. can get. Furthermore, since the honeycomb material 2 and the double-sided materials 5.6 are wrapped around each other, no seams occur in the middle of the peripheral wall 1, and this also further improves the heat insulation properties.

In addition, between the double-sided material 5.6 and the honeycomb material 2, a base material 30
Since the adhesive member 3.4 impregnated with resin 32 is interposed in the adhesive member 3.4, when the honeycomb material 2 is pressed against the base material 30 in the wrapping process of the honeycomb material 2, as shown in FIG.
Resin 3 is applied from the base material 30 to the peripheral portion of the end face of the honeycomb material 30.
2 oozes out, and a stronger adhesive force is obtained compared to bonding only the end surfaces. Incidentally, FIG. II shows structure B formed by applying the present invention.
It shows. This structure B uses a foam as a core material 7,
This core material 7 is a hollow structure surrounded by a peripheral wall 8, and the peripheral wall 8 is a honeycomb material 81 similar to the hollow structure A.
It is formed by bonding inner and outer surface materials 84 and 85 to both the inner and outer surfaces of the inner and outer surfaces via inner and outer adhesive members 82 and 83.

Regarding its manufacture, a core material 7 is used instead of the mandrel M, and an inner surface material 84, an inner adhesive member 82, a honeycomb material 81 . Outer adhesive member 83. Outer side material 8
5 are wound one after the other and then cured. In this case, there is no demolding step and the core material 7 is left as is, resulting in a structure without any hollow parts.

Therefore, this structure B is also lightweight. High rigidity. It provides thermal insulation properties and can be used for panels etc. that take advantage of this property.

Although the embodiments of the present invention have been described above in detail with reference to the drawings, the specific configuration is not limited to these embodiments. It can also be used not only for vehicle air conditioning ducts, bumper armatures, but also for other industrial equipment and buildings (containers, capsule houses), etc.

Further, the shape of the hollow portion is not limited to a rectangular shape, but may be any shape such as a circle or a polygon. In this case, the shape of the mandrel corresponds to the shape of the hollow portion.

(Effects of the Invention) As explained above, since the hollow structure of the present invention uses a honeycomb material as a core, it can be made lighter and more rigid than a hollow structure made by the conventional filament winding method. Furthermore, since the peripheral wall is seamless and has an air layer, it has the effect of providing excellent heat insulation performance.

Furthermore, as mentioned above, since the peripheral wall is made of honeycomb material as the core, it is possible to perform groove machining, R machining, and insert machining on the honeycomb material as necessary before expanding the honeycomb material, which has excellent processing applicability. You can also get the effect of being there.

In addition, since the manufacturing method of the present invention is a forming method in which the inner and outer surface materials and the honeycomb material are sequentially wound around a mandrel,
Even if there is a difference in circumference between the outside and outside of the honeycomb material, the adhesive surface between the honeycomb material and the double-sided material will not shift, and the honeycomb material can be laminated while minimizing deformation of the inside and outside of the material. This method has the effect that a beautiful finish can be obtained, and in addition, since the honeycomb material and double-sided materials are rolled and laminated in this way, it is possible to provide a hollow structure with no seams on the peripheral wall. can get.

In addition, the shape of the hollow part can be changed simply by changing the shape of the mandrel, giving the effect of a high degree of freedom in shaping.

[Brief Description of the Drawings] Fig. 1 is a sectional view showing a hollow structure according to an embodiment of the present invention;
The figure is a partially enlarged view showing the peripheral wall of the hollow structure, FIGS. 3 to 10 are explanatory views showing the manufacturing method of the embodiment of the present invention, and FIG. 11 is a sectional view showing an application example of the present invention. . A...Hollow structure 1...Peripheral wall 2...Honeycomb material 3...Inner adhesive member (adhesive layer) 4...Outer adhesive member (adhesive layer) 5...Inner side member 6...・Outer side material 10...Hollow part M...Mandrel

Claims (1)

[Scope of Claims] 1) A hollow portion is formed inside surrounded by a peripheral wall, and the peripheral wall is formed of a honeycomb material forming a core and a face material covering both the inside and outside of this honeycomb material. A hollow structure characterized by 2) Wrap the inner wall material around the mandrel, then wrap and bond the honeycomb material over the inner wall material with an adhesive layer interposed between the inner wall material and the surface of the honeycomb material. An adhesive layer is interposed between the honeycomb material and the outer surface material is wrapped around and bonded to the honeycomb material.Finally, after the adhesive layer is cured, the laminated honeycomb material and inner and outer surface materials are removed from the mandrel. A method for manufacturing a hollow structure, characterized by: