JP2000168882A - Resin frame, and refrigerating container equipped with the frame - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve rigidity at a flange for a frame and to provide sufficient strength therewith for racking by a method wherein the frame is constructed, being made of resin which includes continuous fibers in which fiber reinforcement resin material layers are oriented in the direction different from the direction that is in parallel with the edge of the flange. SOLUTION: A resin frame 1 is composed of a frame body 1a and a flange 1b, and the frame body 1a is constructed in a structure wherein the side is constructed by interposing a plastic foam 5 serving as a heat insulating material between an external plate 4a and an internal plate 4b each made of fiber reinforcement resin material layers. The flange 1b which is formed by uniting the outer circumferential edges of the external plate 4a and the internal plate 4b is formed of fiber reinforcement resin material layers made up of matrix resin 6 which is the same as in the case of the frame body 1a and continuous reinforcement fibers 7. The continuous reinforcement fibers 7 are in a reinforcement fiber sheet in plain fabrics and reinforced by continuous fibers oriented in the direction different from the direction which is in parallel with the edge of the flange 1b and thereby, rigidity is improved for the flange and sufficient strength for racking is ensured therewith.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin frame and its use, and more particularly to a resin frame attached to a refrigeration container used for marine transportation and the like.

[0002]

2. Description of the Related Art Conventionally, a refrigeration container having a built-in refrigerator is used for transporting various kinds of luggage such as food in a frozen state by ship, railroad or vehicle. Normal,
The refrigeration container is configured such that a frame on which a refrigerator is mounted is attached to a substantially box-shaped container body having an open surface so as to cover the open surface.

Since a plurality of such containers are stacked during transportation, the frame is required to have a strength capable of withstanding the weight of the containers stacked thereon. Also,
The frame needs to have high heat insulation to prevent heat conduction from outside to the load in the container. Therefore, generally, the frame of the refrigeration container is formed by combining an outer plate or an inner plate made of a metal material such as steel or aluminum with a heat insulating material made of a urethane foam or the like.

[0004] For efficient transportation, it is preferable that the weight of the container itself is light. Therefore, Japanese Patent Application Laid-Open
JP-A-157792, JP-A-10-170129 and JP-A-10-160326 disclose a so-called insulating material made of a foamed resin interposed between an outer plate and an inner plate made of a resin mixed with reinforcing fibers. It is disclosed that the frame is constituted by a foam core sandwich board.

[0005]

However, the biggest problem when the frame of the frozen container is formed of a resin-made structural material such as a foam core sandwich board is that the main body of the frame is connected to the container main body by bolts or the like. The racking strength of a flange portion having a mounting hole for mounting by mounting.

[0006] That is, as for the shape and the like of the mounting hole, an international standard is adopted so that the same frame can be mounted on any container body.
Since this standard is based on a flange made of steel plate, a flange made of ordinary fiber reinforced resin material with relatively low local crushing strength is not affected by the load applied from the mounting hole portion via bolts etc. On the other hand, the flange may not be able to withstand and may be damaged. If the flange portion of the frame is damaged, in the worst case, the frame is detached from the container body, and the load in the container is discharged to the outside.

[0007] In view of the above, Japanese Patent Application Laid-Open No. H10-15779 described above.
No. 2, JP-A-10-170129 and JP-A-10-160326, a frame member is provided inside a flange formed by integrating an outer plate and an inner plate of an outer plate of a frame body. It has been proposed to insert a metal frame.

[0008] However, the insertion of the above-mentioned metal skeleton member inside the flange of the frame increases the weight of the entire container. In addition, the manufacturing process of the frame is complicated, and increase in manufacturing time and manufacturing cost is inevitable. In addition, heat from the outside may be conducted into the container via the metal skeletal member.

An object of the present invention is to solve the above-mentioned problems in the conventional technology. That is,
An object of the present invention is to provide a novel resin frame which is easy to manufacture and lightweight, and has a high rigidity of a flange portion and a sufficient racking strength, and manufactures a high-strength refrigeration container using the same. It is in.

[0010]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a resin frame having a frame body and a flange made of a fiber reinforced resin material layer having a mounting hole for the frame body. This is achieved by a resin frame including continuous fibers in which a resin material layer is oriented in a direction different from a direction parallel to the edge of the flange portion. The angle between the direction parallel to the edge of the flange portion and the orientation direction of the continuous fibers is preferably in the range of 30 ° to 60 °, and the angle occupied by all the reinforcing fibers in the fiber-reinforced resin material layer. The proportion of continuous fibers is preferably at least 10%.
The continuous fiber is preferably a carbon fiber. The “direction parallel to the edge of the flange portion” refers to a direction along the edge (edge) of the flange portion, and need not necessarily be a linear direction.

The mounting hole in the flange portion of the frame of the present invention may be formed by post-processing, and a metal bush may be fitted in the mounting hole. The frame of the present invention is attached to a container body to constitute a refrigeration container.

[0012]

Embodiments of the present invention will be described with reference to the drawings. FIGS. 1 (a) and 1 (b) are a front view and a side view, respectively, of a resin frame 1 for a refrigeration container (hereinafter, simply referred to as "frame 1") which is an example of an embodiment of the resin frame of the present invention. It is. 1 (a) and 1 (b)
2 shows the layer structure of the flange portion 1b of the frame 1 in an enlarged manner.

The resin frame 1 shown in FIG.
a and a flange portion 1b, and a recess 2 is formed in the lower portion of the frame body 1a toward the inside of the container. The recess 2 accommodates a refrigerator (not shown) for cooling loads in the container, and cool air from the refrigerator is supplied from the recess 2 to the inside of the container through a passage (not shown).

On the other hand, a pair of left and right inspection windows 3 penetrating the frame body 1a is formed above the frame body 1a. The inspection window 3 in FIG. 1 is substantially rectangular and can be opened and closed by an inspection door (not shown). The inspection door is opened when the inside of the container and the cooling machine are inspected.

First, the frame body 1a will be described. As shown in the partial enlarged view of FIG. 1 (b), in the present embodiment, a plastic foam 5 as a heat insulating material is sandwiched between an outer plate 4a and an inner plate 4b made of a fiber reinforced resin material layer. The main body 1a is configured. The material of the reinforcing fibers contained in the outer plate 4a and the inner plate 4b constituting the frame main body 1a is not particularly limited, and may be glass fiber, carbon fiber, aramid fiber, polyester fiber,
Known fibers such as silicon carbide fibers, boron fibers, natural fibers such as pulp, and stainless steel fibers can be used, but carbon fibers are preferably used to increase the rigidity of the frame body 1a. Note that two or more kinds of fibers may be combined to form a reinforcing fiber.

[0016] The reinforcing form of the reinforcing fibers may be one in which continuous reinforcing fibers are aligned in one direction, one in which continuous reinforcing fibers are woven into a woven fabric, or one in which the reinforcing fibers are cut short to about 5 to 50 mm. Examples thereof include those oriented in a predetermined direction and those dispersed in an indeterminate direction. However, in terms of strength, a woven fabric made of reinforcing fibers oriented in different directions is preferable. Note that the outer plate 4a or the inner plate 4b may not include the reinforcing fiber in a portion of the frame body 1a that does not require particularly high rigidity.

As the matrix resin of the fiber reinforced resin material layer constituting the outer plate 4a and the inner plate 4b, unsaturated polyester resin, vinyl ester resin, epoxy resin, phenol resin, polyamide resin, polyimide resin, furan resin, maleimide resin Although conventionally used fiber reinforced resin materials such as acrylic resin can be used, thermosetting resins are preferable in terms of heat resistance.
The matrix resin may be mixed with various powders, fillers, etc. for the purpose of improving abrasion resistance and the like.

As the material of the plastic foam 5,
Natural rubber, styrene-butadiene copolymer, acrylonitrile-butadiene copolymer, neoprene, chloroprene, polysulfide, polystyrene, styrene-acrylonitrile copolymer, polyethylene, polypropylene,
Known thermoplastic resins such as polyvinyl chloride, polyvinyl alcohol, acetyl cellulose, polyamide, polycarbonate, polyphenylene oxide, polysulfone, polyimide, acrylic resin, and polyurethane, epoxy resin, unsaturated polyester resin, vinyl ester resin, phenol resin, Known thermosetting resins such as urea resins and urea resins can be used. The plastic foam 5 may be mixed with various additives such as antimony trioxide, zircon oxide, barium metaborate, zinc borate, and phosphate for the purpose of imparting flame retardancy.

The plastic foam 5 and the outer plate 4a and the inner plate 4b may be directly bonded to each other, but are preferably bonded via an adhesive layer in order to improve the adhesiveness. The material constituting the adhesive layer is not particularly limited as long as it can firmly adhere the plastic foam 5 to the outer plate 4a and the inner plate 4b. Thermosetting resins such as resin and urethane resin are preferable, and urethane resin is particularly preferable. In order to further improve the adhesiveness,
The adhesive layer may include a fiber mat. However, the fibers constituting the fiber mat need not have a reinforcing action. In addition to the adhesive layer, the plastic foam 5 and the outer plate 4 may be formed using mechanical means such as screws and screws.
a and the inner plate 4b may be reinforced.

Next, the flange 1b will be described.
In the frame 1 shown in FIG. 1, the outer peripheral edges of the outer plate 4a and the inner plate 4b are integrated to form a flange portion 1b, and the flange portion 1b is the same as the fiber reinforced resin material layer constituting the frame main body 1a. It is formed of a fiber reinforced resin material layer composed of a matrix resin 6 and continuous reinforcing fibers 7.

As is clear from the partially enlarged view of FIG. 1 (a), in the frame 1 of FIG. 1, the continuous reinforcing fibers 7 contained in the flange portion 1b are a plain-woven reinforcing fiber sheet. The continuous fiber bundle in the sheet is the flange 1b
Are oriented obliquely with respect to the direction parallel to the edge of. That is, the flange portion 1b is reinforced by continuous fibers oriented in a direction different from the direction parallel to the edge of the flange portion 1b. As the material of the continuous reinforcing fiber 7, glass fiber, carbon fiber, aramid fiber, polyester fiber, silicon carbide fiber, boron fiber, natural fiber such as pulp, stainless steel fiber, etc. can be used, but sufficient for the flange portion 1b. In order to obtain high racking strength, it is preferable to use carbon fibers having high rigidity. The continuous reinforcing fibers 7 may be formed by weaving two or more kinds of reinforcing fiber bundles.

As the continuous reinforcing fibers 7, in addition to the plain-woven reinforcing fiber sheet, a continuous fiber bundle is twill-woven, satin-woven,
On the other hand, a reinforcing fiber sheet of a woven fabric type woven by weaving or the like, or a reinforcing fiber sheet in which continuous fiber bundles are arranged in one direction in a planar manner can be used, but the continuous fibers in the reinforcing fiber sheet are It is necessary that at least a part of the orientation direction is different from the direction parallel to the edge of the flange portion 1b. In terms of reinforcing the strength of the flange portion 1b in all directions, the form of the continuous reinforcing fiber 7 is as follows.
A woven fabric type reinforcing fiber sheet obtained by weaving continuous reinforcing fibers oriented in different directions is preferable.

The angle between the direction parallel to the edge of the flange portion 1b and the orientation direction of the continuous fiber bundle in the continuous reinforcing fibers 7 is 30.
It is preferably in the range of 60 to 60 degrees, and more preferably in the range of 40 to 50 degrees. It is most preferable that the angle be set to 45 ° from the viewpoint of improving the strength of the flange portion 1b.
If the angle is less than 30 ° or greater than 60 °, the degree of improvement in the racking strength of the flange portion 1b will be low.

In the frame 1 shown in FIG. 1, the flange portion 1b includes, as the reinforcing fiber, only the continuous reinforcing fiber 7 in which the fiber is oriented in a direction different from the direction parallel to the edge of the flange portion 1b. The fiber reinforced resin material layer forming the flange portion of the frame may further include continuous reinforcing fibers or discontinuous reinforcing fibers oriented in a direction parallel to the edge of the flange portion. However, in that case, in all the reinforcing fibers included in the portion of the flange portion, a direction different from the direction parallel to the edge of the flange portion, particularly, inclined with respect to the direction parallel to the edge of the flange portion. It is preferable that the proportion of continuous fibers oriented in the direction is at least 10% or more. If the ratio is less than 10%, it becomes difficult to improve the racking strength of the flange portion. In addition, the direction parallel to the edge of the flange, the direction perpendicular to,
It is particularly preferable that the ratio of the continuous reinforcing fibers oriented in the + 45 ° inclined direction and the −45 ° inclined direction is 1: 1: 1: 1 because the surface pressure strength of the flange portion is maximized.

It is sufficient that the continuous reinforcing fiber 7 exists at least in the flange portion 1b. However, in view of improvement in the strength of the entire frame and easiness of the manufacturing operation, the frame main body 1 is not required.
It is preferable that a is also reinforced by the same reinforcing fiber as the continuous reinforcing fiber 7 in the flange portion 1b.

In the flange portion 1b of the frame 1, a plurality of mounting holes 8 for mounting the frame main body 1a on the opening surface of the container main body not shown in FIG. The mounting hole 8 is manufactured by forming a portion where the matrix resin 6 and the continuous reinforcing fiber 7 do not exist in the flange portion 1b in advance by, for example, arranging a core at a predetermined position in a mold in manufacturing the frame 1. However, in order to secure the racking strength around the mounting hole 8, the mounting hole 8 is preferably formed in the flange portion 1b by post-processing such as drilling or punching.

FIG. 2 is a perspective view of the refrigeration container 10 in which the frame 1 is attached to the opening surface of the container body 9. The frame 1 of the present invention is mounted and fixed to the container body 9 by a fastening jig such as a bolt through a plurality of mounting holes 8 formed in the flange portion 1b. The container main body 9 has a not-shown carry-in port, and the carry-in port is openable and closable by a door or the like.

By the way, when the freezing container 10 moves or loads are loaded, pressing force, impact force, etc. are applied to the frame 1 from the container body 9 via the bolts and the like.
When viewed locally, the size is the mounting hole 8 of the flange 1b.
Is the largest part. Therefore, by fitting and reinforcing the metal bush 11 in the mounting hole 8 where such stress is concentrated, the mounting hole 8 can be prevented from being damaged, and a safer refrigeration container 10 can be obtained.

The frame 1 shown in FIG. 1 can be manufactured, for example, as follows.

First, a sheet-like plastic foam 5 having a predetermined thickness and shape is manufactured. The method for producing the plastic foam 5 is not particularly limited,
A known continuous or batch-type foam molding method such as an extrusion foaming method, an injection foaming method, a mold foaming method, a spray foaming method, and a two-liquid mixing method can be appropriately employed. Further, the foaming agent is not particularly limited, and a gas such as nitrogen or the like, or a vaporizable solvent, sodium bicarbonate,
Known foaming agents such as inorganic foaming agents such as ammonium carbonate, and organic foaming agents such as benzenesulfohydrazine-based, azonitrile-based, azocarboxylic-based, diazoacetamide-based, and nitroso-compound-based compounds can be used.

Next, the flange portion 1b of the cavity of the mold
The continuous reinforcing fiber 7 is arranged at a portion corresponding to. On the other hand, the frame body 1a does not necessarily need to include the reinforcing fiber, but it is preferable to arrange the reinforcing fiber also in the cavity portion corresponding to the frame body 1a in order to improve the strength of the entire frame. It is more preferable to arrange the same reinforcing fiber as the continuous reinforcing fiber 7 used for (1).

The continuous reinforcing fibers 7 are arranged in the cavity such that the orientation direction of the fibers is inclined with respect to the direction along the edge of the flange portion 1b. In addition, other reinforcing fibers than the continuous reinforcing fibers 7 may be further superposed on the portion where high strength is required, but the continuous reinforcing fibers 7 occupying the entire reinforcing fibers existing in the flange portion 1b may be arranged. The ratio of 10
% Is preferably maintained.

Next, the plastic foam 5 is placed on the reinforcing fibers placed in the cavity, and the reinforcing fibers are further placed thereon if necessary. Then, the mold is closed, and the liquid curable resin is injected into the cavity,
Impregnate the reinforcing fibers in the cavity. Next, the resin is cured by heating or the like, whereby the reinforcing fibers in the cavity and the curable resin are integrated to obtain the frame 1. That is, the reinforcing fiber is impregnated and cured with the curable resin to form the outer plate 4a and the inner plate 4b in the cavity.
And, at each outer peripheral edge, the outer plate 4a
And the flange part 1b of the shape which the inner plate 4b integrated was manufactured. After confirming that the resin is sufficiently cured, the frame 1 is taken out of the mold by opening the mold.

The mounting hole 8 is formed by drilling, punching or the like in the flange 1b of the frame 1 manufactured as described above. The metal bush 11 is fitted as required.

[0035]

The present embodiment will be described below in more detail by way of examples. <Example> Pyrofil TR50S-1 as a reinforcing fiber
Using 2L (registered trademark of Mitsubishi Rayon Co., Ltd.), a plain-woven carbon fiber cloth having a basis weight of 650 g / m ² was produced. Further, a plastic foam made of a polyurethane foam resin having a density of 200 kg / m ³ was previously produced as a heat insulating material by mold foam molding. Next, in the cavity of the mold for manufacturing a frame, eight pieces of the carbon fiber cloth are set so that the fibers are oriented in a direction perpendicular to a direction parallel to an edge of the cavity,
Further, the carbon fiber cloth is so set that the orientation direction of the fiber is inclined by ± 45 ° with respect to the direction parallel to the edge of the cavity.
Set. Then, after setting the plastic foam thereon, the mold was closed, and a liquid uncured room-temperature-curable epoxy resin was injected, and the resin was left at room temperature for 8 hours to cure the resin. After confirming the resin curing, the mold was removed to obtain a frame. Attachment holes were drilled at predetermined positions in the flange portion of the frame. A metal bush was press-fitted into the mounting hole where the stress was concentrated.

[0036]

The resin frame of the present invention is lighter in weight than a metal frame and has sufficient corrosion resistance to seawater and the like. Since the flange portion is made of the fiber reinforced resin material layer and includes continuous fibers oriented in a direction different from the direction parallel to the edge thereof, the flange portion has high rigidity and sufficient racking strength. Therefore, a high-strength refrigeration container can be manufactured. In addition, since no metal reinforcing member is used for the flange portion, the weight of the entire frame does not increase and the manufacture is easy. When a core material made of a plastic foam or the like is provided, a suitable heat insulating property can be obtained.

The angle between the direction parallel to the edge of the flange portion and the continuous fibers in the fiber reinforced resin material layer is 30.
When it is within the range of {-60}, or when the ratio of the continuous fibers to all the reinforcing fibers in the fiber-reinforced material layer is 1
When it is 0% or more, the rigidity of the flange portion can be effectively increased.

When carbon fibers are used as the continuous fibers, the rigidity of the flange portion can be further increased while maintaining the lightness of the frame.

When the mounting hole is formed in the flange portion of the resin frame of the present invention by post-processing, the strength of the flange portion reinforced by the reinforcing fibers can be sufficiently utilized. Further, when a metal bush is fitted in the mounting hole, there is no possibility that the mounting hole is damaged by excessive stress.

The refrigeration container to which the resin frame of the present invention is attached can be mounted on a transportation means such as a ship, etc., even when a large stress is applied to the joint between the flange portion of the frame and the container body. The part is safe without breakage.

[Brief description of the drawings]

FIG. 1 is a front view and a side view of an embodiment of a resin frame according to the present invention.

FIG. 2 is a perspective view of the refrigeration container of the present invention in which the resin frame of the present invention is attached to the opening surface of the container body.

[Explanation of symbols]

 Reference Signs List 1 frame 2 depression 3 inspection window 4a outer plate 4b inner plate 5 plastic foam 6 matrix resin 7 continuous reinforcing fiber 8 mounting hole 9 container body 10 freezing container 11 metal bush

Claims (7)

[Claims] 1. A resin frame comprising: a frame main body; and a flange portion made of a fiber reinforced resin material layer having a mounting hole for the frame main body, wherein the fiber reinforced resin material layer is provided at an edge of the flange portion. A resin frame comprising continuous fibers oriented in a direction different from the parallel direction. 2. The resin frame according to claim 1, wherein an angle between a direction parallel to an edge of the flange portion and an orientation direction of the continuous fiber is 30 ° to 60 °. 3. The resin frame according to claim 1, wherein a ratio of the continuous fibers to all the reinforcing fibers in the fiber reinforced resin material layer is 10% or more. 4. The resin frame according to claim 1, wherein the continuous fibers are carbon fibers. 5. The resin frame according to claim 1, wherein said mounting hole is formed by post-processing. 6. The resin frame according to claim 1, wherein a metal bush is fitted in said mounting hole. 7. A refrigeration container to which the resin frame according to claim 1 is attached.