JP3165426B2 - Double bottom container and method of manufacturing the same - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a container which is integrally formed and has a double structure, and more specifically, an inner shell, an outer shell and a lid of a container main body are connected to form an integral unit. TECHNICAL FIELD The present invention relates to a container having a double structure and a method of manufacturing the same.

[Prior Art] In recent years, with the development of packaging technology, containers with a double bottom structure having excellent buffering properties and heat insulating properties have been proposed and widely used.

There is also known a container having a single-layer structure in which a lid and a container main body are simply continuous with each other via a hinge.

However, since the inner shell, the outer shell, and the lid of the container main body are separately formed in the conventional double-structured container, it is complicated to incorporate them, and the lid and the container main body are not connected. Therefore, there was a disadvantage that the lid was easily detached.

Therefore, it has been proposed to improve the disadvantage that the lid can be easily removed by inserting a separately molded hinge between the lid and the container body and fixing it with an adhesive, a clip, a screw, or the like. However, there is a disadvantage that the manufacturing process is complicated.

In addition, a container with a lid integrally continuous via a hinge,
Since it does not have a double bottom structure, it has no heat insulating property or cushioning property. For example, when it is used for a lunch box, the content is quickly cooled, and it cannot be used for packaging precision mechanical parts.

[Problems to be Solved by the Invention] The present invention improves the disadvantages of the prior art, is a container that is easy to manufacture, is excellent in heat insulation and cushioning properties, is easy to pack, and has a lid with a container body. It is an object of the present invention to provide a double-structured container that is difficult to come off.

[Means for Solving the Problems] Under such circumstances, the present inventors have conducted intensive studies in order to solve the above problems, and as a result, the inner shell of the container main body, the outer shell of the container main body, and the lid were examined. It has been found that the above object can be achieved by continuously and integrally forming the members via a hinge, and based on this finding, the present invention has been completed.

That is, the present invention consists of the following items.

1. An outer shell of a container main body, an inner shell of a container main body having an article storage portion, and a lid, and one of the outer shell of the container main body, the inner shell of the container main body, and the lid. The three parts are integrally connected via two hinge parts with the middle part as the middle part. The inner shell is fitted into the outer shell by bending the first hinge, and the bottom of the inner shell is Forming a double bottom structure in which the outer shells overlap, forming a lid on the inner shell by bending a second hinge, and forming the inner shell, the outer shell, the lid and the hinge; Are molded from a material that is integrally continuous.

2. An outer shell of the container main body, an inner shell of the container main body having an article storage portion, an outer lid and an inner lid, the outer shell of the container main body, an inner shell of the container main body, an outer lid and an inner lid. Are integrally connected via three hinges, and the inner hinge fits into the outer shell of the container body by bending the first hinge to form a double-bottom structure. By bending the hinge, the inner lid covers the upper surface of the inner shell to close the article storage portion, and by bending the third hinge, the outer lid covers the inner lid to form a double lid structure, and Outer shell, inner shell,
A double bottom container made of a thermoplastic resin, wherein an outer lid, an inner lid and a hinge are integrally formed of a continuous material.

3. The first in which the outer shell, inner shell, and lid are arranged in a row
Item 3. The double bottom container according to Item 2 or 2.

4. In a method of heating a synthetic resin sheet and integrally manufacturing a container body and a lid by vacuum forming or air pressure forming, an outer shell of a container main body, an inner shell of a container main body having an article storage section, A method of manufacturing a double-bottomed container, characterized by using a mold having a concave-convex surface formed of a lid portion and two hinge portions connecting these three portions.

5 In a method of integrally manufacturing a container body and a lid by vacuum molding or air pressure molding by heating a synthetic resin sheet, an outer shell of a container main body, an inner shell of a container main body having an article storage section, A method for manufacturing a double-bottomed container, characterized by using a mold having an uneven surface comprising an outer lid portion, an inner lid portion, and three hinge portions connecting these four portions.

6. Fifth body outer shell, inner shell, and lid are arranged in a row
The manufacturing method described in the item.

7. The structure according to item 1 or 2, wherein the lid is divided into left and right sides and is opened from the central part, and the hinge part is increased by one.
Heavy bottom container.

 Hereinafter, the present invention will be described in detail.

The container according to the first aspect of the present invention comprises an outer shell, an inner shell, and a lid of the container body, and these are connected by two hinges. In this case, it is desirable to provide a flange portion as shown in the embodiment on the outer shell of the main body container, and the flange is fitted to a groove provided on the inner shell of the container main body or a peripheral edge of the lid to fix them. Can be.

The shape of the outer shell of the container body of the present invention may be various shapes such as a polygon such as a triangle, a quadrangle, a pentagon, and a hexagon, a shape in which some sides of the polygon are arc-shaped, a circle, a semi-circle, and a circular shape. Although it can be shaped, a rectangle is generally preferred because it allows the hinges to be longer and more robust.

In the first invention container, the inner shell of the container body, the outer shell of the container body, and the lid need to be connected via two hinges. There are various modes of this connection depending on which of the three parts is in the middle. For example, the inner shell and the lid of the container body are connected to the outer shell of the container body via hinges, respectively. The outer shell of the container body and the lid are connected to the inner shell of the container body via the hinge, respectively, and the outer shell of the container body and the inner shell of the container body are connected to the lid via the hinge, respectively. And the like.

Among these connection modes, the one in which the inner shell of the container body and the lid are connected to the flange of the outer shell of the container body via hinges, respectively, is easy to fix when the lid is folded, and is stable. Is preferred.

Further, it is desirable that the three parts of the container of the present invention be connected linearly in terms of a good yield of raw material sheets in sheet forming by vacuum or compressed air. However, even in the case of the L-shaped connection, a reduction in the yield of the raw material sheets can be prevented by using a two-piece mold.

The hinge is formed of a thin sheet and has various shapes, but a cross section having a corrugated shape is preferable. With this hinge, the inner shell and the lid of the container body are sequentially folded on the outer shell of the container body to form a double-bottomed container formed by the outer shell and the inner shell, and the container can be opened. Can also.

The inner shell of the container main body may be fixed to the inside of the outer shell of the container main body as long as it is fitted, and may be formed into various shapes. For example, it is possible to use a method in which a groove that fits into the ridge provided on the outer shell is provided on the periphery of the inner shell, and the groove is fitted to and fixed to the ridge of the outer shell. Alternatively, it is possible to use a method in which the dimensions of the peripheral edge of the inner shell are simply fitted to the inner surface of the outer shell exactly, and at this time, a method of providing a groove or a convex portion for stopping the hinge from returning by elasticity, and fixing the same. .

The lid is fixed by a method similar to the above inner shell, in which a groove provided on the periphery of the lid is fitted to the ridge of the outer shell, or the outer shell is formed into a cap shape so that the inner surface of the periphery of the lid is outside the outer shell. In addition, a method of covering the periphery of the bag body and fixing it can be used, and also in this case, a detent structure can be provided.

The inner shell of the container of the present invention has a storage portion capable of storing stored articles, and the storage portion may be one or two or more separately. The shape of the storage section may be formed in accordance with the shape of the stored article, and can be variously shaped.

Further, the shape of the lid of the container of the first invention can be depressed on the upper surface, so that the lower part of the lid closes the article storage portion of the inner shell. Thereby, the stored articles can be packaged separately in each storage section.

It is preferable to provide a space between the bottom of the inner shell of the first invention container and the bottom of the outer shell of the container body. This space can provide a buffering effect and a heat insulating effect. To ensure this space, it is necessary to make the depth of the inner shell shallower than the depth of the outer shell.However, furthermore, a flange is provided around the opening of the inner shell, and the inner shell is attached to the flange of the outer shell. It is preferable to overlap the flanges. When the inner shell is provided with a flange as described above, the hinge is provided on the periphery of the inner shell flange.

The first container of the present invention exhibits heat insulation and cushioning properties in the direction of the lower surface of the article storage portion, but has a single-layer structure at the upper portion, which is the same as a normal container. However, for example, when the present invention container is used as a lunch box, there is air above the stored food, which has a considerable heat-insulating effect for a short time, and is suitable for normal use. Also, with regard to the buffering property, in the case of being transported while maintaining the vertical direction, it is often sufficient to have a buffering effect on the lower side.

The outer shell, inner shell, lid, flange and hinge of the container body are
It must be integrally molded with synthetic resin.

The manufacturing process is simple because it can be manufactured by integral molding, and since the parts are connected by hinges by integral molding, it is possible to assemble into a double-structured container simply by bending the hinge and storing Easy to pack things.

The integral molding can be performed by various molding methods such as vacuum molding, pressure molding, and injection molding, but vacuum molding and pressure molding are preferable.

As synthetic resins that can be used in the present invention, for example, low density polyethylene, low density linear polyethylene, high density polyethylene, homopolypropylene, random polypropylene,
Block polypropylene, polystyrene, ABS resin, AS
Various kinds of resins such as resins, vinyl chloride resins, vinylidene chloride resins, methacrylic resins, polyacetals, polyamides, polyesters (such as polyethylene terephthalate), polycarbonates, polyurethanes, and fluororesins can be used alone or in combination of two or more. Among these synthetic resins, polypropylene is preferred from the viewpoint of high hinge strength.

Further, when the container of the present invention is suitable for disposable use, it is manufactured with a thin sheet, and when the container is used repeatedly, a thick sheet and strong resin can be used.

To these synthetic resins, inorganic fillers, organic fillers and various additives can be added.

For example, inorganic fillers include calcium carbonate, kaolin, talc, mica, silica, asbestos, barium sulfate, calcium sulfate, metal powder, glass fiber, carbon fiber, metal whisker, and the like. Powders, plastic fibers and the like can be mentioned, and examples of the additives include antioxidants, ultraviolet absorbers, flame retardants, antistatic agents, release agents, plasticizers, lubricants, coloring agents, and raw materials.

Also, by using foamed synthetic resin,
Along with the weight reduction, it is possible to further improve the cushioning property and the heat insulating property.

The container of the second invention has a structure in which the inner lid is connected to any one of the three parts of the outer shell, the inner shell, or the lid (outer shell) of the first invention container via a hinge, and the inner lid is the first container. One invention container has a structure in the middle of three parts, and four parts are connected by three hinges.

The second invention container is provided with a double structure also on the upper side, and the heat insulating effect and the buffering effect are further improved.

The inner lid used here has a surface that is in close contact with the upper surface of the inner shell, which serves as an inner lid for each of the article storage sections of the inner shell, and covers each of the article storage sections to store the stored articles. Is fixed or isolated from above.

The inner lid may be a simple sheet, but may be provided with a convex portion in accordance with the upper shape of the stored article, or a peripheral edge having a groove directly or indirectly fitted to the peripheral edge of the outer shell. . The inner lid may have a structure that can be fixed alone, or a structure that is fixed to the upper surface of the inner shell by pressing the periphery or several places of the lid surface from above with an outer shell as a simple sheet.

An outer lid is fixed from above the inner lid. This fixing method is the same as that of the lid of the first invention container, and a structure in which a projection is provided on the lower surface of the outer lid to fix the outer lid and the inner lid can be adopted.

By fixing the outer lid, a space is formed between the outer lid and the inner lid, and a double lid structure can be formed above.

In the container of the second invention, the stored articles can be isolated, and spaces are formed above and below the storage section.
The heat insulation effect and the buffering effect are further excellent.

Further, the stored articles can be maintained and fixed in the storage section even if the articles fall over during transportation.

The arrangement of the four parts of the second invention container is desirably linear as in the first invention container from the viewpoint of the yield of the raw material sheet, but an L-shaped or cross-shaped arrangement can also be selected.

In the container of the present invention, a container in which a lid portion (including an inner lid) is divided into two pieces to form a double-opening structure from the center is also an embodiment of the container of the present invention. In this case, a hinge portion is provided for one lid. Two are required, and the number of hinges increases by one.

If both the outer lid and the inner lid are double-opened, the number of hinges increases, and such a container is also equivalent to the container of the present invention.

In the production method according to the fourth and fifth aspects of the present invention, specifically, the synthetic resin sheet is heated and softened, and the outer shell of the expanded main body of the first and second invention containers and the container This is a method for manufacturing a container in which a synthetic resin sheet is fixed on a mold capable of forming an inner shell, a lid, and a hinge, and is pressed against the mold surface by vacuum or compressed air to form a sheet.

The temperature range of the molded sheet varies depending on the type of the resin, for example, 110 to 150 ° C for polystyrene, 80 to 150 ° C for vinyl chloride resin, 110 to 190 ° C for polyethylene, 170 to 220 ° C for polypropylene, 17 for polycarbonate.
0-200 ° C is suitable. Further, other conditions for vacuum forming or pressure forming may be appropriately selected according to the type of resin, the thickness of the sheet, the shape of the molded product, and the like.

The trimming may be performed simultaneously with the vacuum forming or the pressure forming, or may be performed after the forming. Further, the molded article can be subjected to a heat treatment if desired.

Next, an embodiment of the present invention will be specifically described with reference to the drawings.

FIG. 1 shows a developed structure of the double structure container of the present invention, and FIG. 2 shows a cross section taken along line AB in FIG.

The outer shell 1 of the container body has a flange 4 on the periphery of the opening, and has a substantially square planar shape. The inner shell 2 of the container body has a flange 6 on the periphery of the opening, which also has a substantially square shape in a plane. The lid 3 also has a flange 7 on the periphery of the opening, and has a substantially square planar shape. Although the flange is not always necessary, it is preferable to provide the flange in this manner because the inner shell 2 and the lid 3 of the container body are easily fixed when the container is folded. One side of the flange 4 and one side of the flange 7 are connected via a hinge 5 having a corrugated cross section, and the other side of the flange 4 and one side of the flange 6 are connected to a thin hinge 5 having a corrugated cross section. Is linked to In FIGS. 1 and 2,
The inner shell 2 and the lid 3 of the container body are connected to opposite sides of the flange 4 of the outer shell 1 of the container body, and three parts are arranged in a line. An L-shaped structure in which the inner shell 2 and the lid 3 of the container body are connected to the side adjacent to the flange 4 of the shell 1 may be used.

As another embodiment of the container of the present invention, as shown in FIG. 4, there is a container in which the lid 3 is divided from the center and connected to the outer shell 1 of the container body by left and right hinges. In this case, the lid is opened like a double door, and the left and right joints can be fixed with adhesive tape when fixed.

In the above embodiment, the hinge 5 is bendable, and the inner shell 2 and the lid 3 of the container main body are sequentially folded on the outer shell 1 of the container main body to form a double-structured container.

A jetty 8 is provided on the upper surface of the flange 4 of the outer shell 1 of the container body,
It is provided all around. On the other hand, a jetty 9 is also provided on the lower surface of the flange 6 of the inner shell 2 of the container body, and when the inner shell 2 is folded and folded into the outer shell 1, the jetty 8 fits into the jetty 9 and Combine. The jetties 8, 9 are not always necessary, but the jetty 8, 9 allows the inner shell 2 to be firmly fixed to the outer shell 1. Jetty 8 need not be hollow, but jetty 9 needs to be hollow. Jetty 8 and jetty 9
Need not be provided all around the flanges 4, 6;
It may be provided locally. The jetty 8 may be provided downward on the lower surface of the flange 4. In this case, jetty 9
Is provided upward on the upper surface of the flange 6, and the jetty 8 needs to be hollow in order to fit the jetty 9.

Outside the jetty 9, when the lid 3 is folded, the side wall 10 of the lid 3
And the lid 3 is fixed. Note that the jetty 8 is
When provided on the lower surface of the cover 3, the cover 3 may be flat.

A storage section 11 is provided in the inner shell 2. The depth of the storage section 11 is smaller than the depth of the outer shell 1, so that better heat insulation and cushioning can be obtained in the space below the storage section. In addition, a part 12 of the bottom of the housing 11 may be in contact with the bottom of the outer shell 1. The portion 12 in contact with the bottom of the outer shell 1 can reduce the deflection of the inner shell 2 due to the load of the stored items, and is therefore preferable when the jetties 8 and 9 are not provided. The storage section 11 may be provided with a rib 13 to reinforce the strength.

The top of the lid may be flat as shown in FIGS. 1 and 2, or the top may be concave as shown in FIG.
If the top is concave, the partition top 14 of the storage section 11 and the concave section of the lid 3 are in contact with each other. Therefore, when there are a plurality of storage sections 11, the movement of the storage items between the storage sections can be suppressed. preferable.

The container of the embodiment is made of homopolypropylene, has a strong hinge, and is transparent, so that stored items can be seen from the outside. Further, since the whole is integrated, the folding operation of the inner shell 2 and the lid 3 is easy, and furthermore, the packaging of the stored items is easy.

In the illustrated container, the inner shell 2 and the lid 3 are connected to the outer shell 1, respectively. However, the outer shell 1 and the inner shell 2 may be replaced with each other, or the outer shell 1 and the lid may be connected. They may be interchanged and connected.

FIG. 6 shows an embodiment of the second invention container.

This is a plan view seen from above, and the outer lid 3,
The outer shell 1, the inner shell 2, and the inner lid 31 are linearly arranged,
The inner shell 2 is fitted to the outer shell 1 whose upper part is opened by the hinge 51 being bent and then the hinge 52 is bent so that the inner lid 31 seals the opening edge of the storage portion 11 of the inner shell 2. The outer lid 3 can be fixed together with the inner lid by fitting the outer lid 3.
When the inner lid 31 is attached to the left of the outer lid 3, the inner lid is first fixed inside the outer lid 3, and then the outer lid 3 is closed.

As described above, it is possible to form the upper and lower double wall structures by disposing the inner lid 31 between the outer lid 3 and the outer shell 1.

Further, for example, the positions of the outer lid 3 and the outer shell 1 can be exchanged. In this case, after putting the goods in the inner shell 2,
The article can be packaged by putting the inner lid 31, covering the outer lid 3 thereon, turning the outer shell 1 around and fitting the outer shell 1 to the bottom.

The arrangement of the four parts in the embodiment of the second invention can adopt an L shape or a cross shape.

However, like the first invention, the linear arrangement is more desirable in terms of the yield of raw materials.

[Effects of the Invention] According to the configuration of the present invention described above, it is possible to provide a container in which the inner shell and the lid of the container main body are easily folded and the packaging of the stored items can be easily performed. INDUSTRIAL APPLICABILITY According to the container of the present invention, it is useful for food packaging in terms of the heat insulating effect of the stored articles, and is suitable for packaging precision components because of its good buffering property.

In particular, a container having a double wall structure at the top and bottom has an advantage that the heat insulating effect and the buffering effect are further excellent.

Further, the container of the present invention has an advantage that it can be easily manufactured in one step by vacuum forming or pressure forming a synthetic resin sheet.

The container of the present invention is used as a packaging container that requires buffering properties, such as packaging for electric appliances, electric products, mechanical parts, and instruments, and a food packaging container such as a lunch box or food for a microwave oven. It is extremely useful.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an unfolded state of a double structure container according to one embodiment of the present invention, and FIG. 2 is a diagram showing the container of FIG.
FIGS. 3 and 4 are cross-sectional views taken along line B.
The figure is a plan view in which the inner shell and lid of the container main body are connected to adjacent sides of the flange of the outer shell of the container main body.
The figure is a simplified sectional view of the container of one embodiment of the present invention in a folded state, and FIG. 6 is a plan view of another embodiment of the container of the present invention. The reference numerals in the figure indicate the following. 1: outer shell of container body, 2: inner shell of container body, 3: lid, 4: flange, 5: hinge, 6: flange, 7: flange, 8: jetty, 9: jetty, 10: side wall, 11: The storage section, 13: rib, 14: top of the partition section.

Claims (7)

(57) [Claims] 1. An outer shell of a container main body, an inner shell of a container main body having an article storage section, and a lid, wherein an outer shell of the container main body, an inner shell of the container main body, and a lid are formed. The three parts are integrally connected via two hinge parts with one of them as an intermediate part, and the inner shell is fitted into the outer shell by bending the first hinge, and Forming a double bottom structure in which the bottom of the shell and the outer shell overlap each other, forming a lid on the inner shell by bending the second hinge, and
A double bottom container made of a thermoplastic resin, wherein the inner shell, the outer shell, the lid, and the hinge are integrally formed of a continuous material. 2. An outer shell of a container main body, an inner shell of a container main body having an article storage portion, an outer lid and an inner lid, wherein the outer shell of the container main body, the inner shell of the container main body, The lid and the inner lid are integrally connected via three hinges, and the inner hinge fits into the outer shell of the container body by bending the first hinge to form a double bottom structure. By folding the second hinge, the inner lid covers the upper surface of the inner shell to seal the article storage portion, and by bending the third hinge, the outer lid covers the inner lid to form a double lid structure. Wherein the outer shell, the inner shell, the outer lid, the inner lid, and the hinge are integrally formed of a continuous material.
Heavy bottom container. 3. The double-bottom container according to claim 1, wherein the outer shell, the inner shell, and the lid are arranged in a row. 4. A method of manufacturing a container body and a lid integrally by heating a synthetic resin sheet and vacuum forming or pressure forming, wherein an outer shell portion of the container body and a container body having an article storage portion are provided. A method for manufacturing a double-bottom container, characterized in that the container is formed using a mold having an uneven surface having a shape comprising a shell, a lid and two hinges connecting these three parts. 5. A method of manufacturing a container body and a lid integrally by heating a synthetic resin sheet and vacuum forming or pressure forming, wherein an outer shell portion of the container body and a container body having an article storage portion. A method for manufacturing a double-bottomed container, characterized by using a mold having an uneven surface comprising a shell portion, an outer lid portion, an inner lid portion, and three hinge portions connecting these four portions. . 6. The method according to claim 5, wherein the outer shell, the inner shell, and the lid are arranged in a line. 7. The double-bottomed container according to claim 1, wherein the lid is divided into left and right sides and is opened from a central portion, and one hinge portion is added.