JP2002337903A - Container with hinged lid integrally molded out of different materials - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a container with a hinged lid capable of being integrally molded put of different materials, showing excellence in both a sealing property and a hinging property, showing excellence in sanitation and moisture resistance due to no clearance between layers and capable of being effectively inexpensive ly manufactured without necessitating an assembling process and an assembling apparatus. SOLUTION: An outer wall layer 4 of a container main body and a lid 3 jointed to the outer wall layer 4 of the container main body with a hinge are molded out of a synthetic resin showing an excellent hinging property. An inner wall layer 5 (a seal wall) is molded out of a soft synthetic resin in the inner circumference of the outer wall layer 4 of the container main body and a container main body side engagement seal portion 8 is formed on the upper edge portion of the inner wall layer 5 of the container main body. A concave and convex mating portion is mounted on a boundary surface of a laminate of the seal wall 5 and the outer circumferential wall 4 to prevent separation between layers.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hinged container integrally formed of a different material.

[0002]

2. Description of the Related Art Hitherto, there have been known various hinge lid containers in which a container main body and a lid hinged to the container main body are integrally formed of a synthetic resin. Such a container in which the container main body and the lid are integrally formed is formed of a single material synthetic resin. As the synthetic resin material, polypropylene, which is excellent in hinge property, that is, has a long flexing life, is generally employed because the lid is hinged. However, polypropylene has a disadvantage in that the sealing properties of the sealing portion are lacking.
On the other hand, the soft material is excellent in the sealing property, but the soft material has a defect that the hinge property is lacking, and an integrally molded container with a hinge lid excellent in both the sealing property and the hinge property has not yet been proposed. For this reason, in order to satisfy both the sealing property and the hinge property in the related art, the inner container and the outer container which have been formed separately, instead of being integrally formed, have to be combined.

[0003]

However, in the case of a container in which an inner container and an outer container which are separately formed are combined, a gap is easily formed between the inner wall and the outer wall. There is a disadvantage that the moisture-proof property is impaired. Also,
From the viewpoint of container production, a step of fitting and assembling separately molded containers is required, and the production efficiency is low, equipment for the production is required, and there is a disadvantage that the cost is increased. Therefore, the present invention is intended to obtain an integrally molded container with a hinge lid which can be integrally molded with different materials and has excellent sealing and hinge properties, whereby there is no gap between layers and excellent hygiene and moisture resistance, Further, it is an object of the present invention to provide a container with a hinge lid integrally formed of different materials which can be efficiently and inexpensively manufactured without requiring an assembling process or an assembling apparatus.

[0004]

According to the present invention, there is provided a container with a hinged lid integrally formed of a dissimilar material and having a hinge lid integrally hinged to the container body. At least the outer peripheral surface of the container body and the lid are formed of a synthetic resin having excellent hinge characteristics, and at least the inner peripheral surface of the upper end of the opening of the container body has a container body side engaged with the lid-side engaging seal portion of the lid. A seal wall having an engagement seal portion is provided, the seal wall is formed of a soft synthetic resin having excellent sealing properties, and the seal wall and the outer peripheral surface of the container body are integrally formed. Is what you do.

[0005] The sealing wall may constitute an inner wall of the container main body laminated on the entire inner peripheral surface of the container main body, or a portion near the upper end of the inner peripheral surface including the upper end of the inner peripheral surface of the cylindrical wall of the container main body. It may be configured as a ring-shaped seal wall laminated and formed on the annular thin portion formed in the above. As the soft synthetic resin forming the seal wall, a synthetic resin having a function of engaging with the lid with the soft resin to enhance the sealing effect and having one or more functions of a gas barrier property, an oxygen absorbing property, and a water absorbing property is selected. By doing so, a container with a hinged lid integrally formed of different materials having these functions can be obtained. Further, by making the laminated interface between the seal wall and the outer peripheral wall of the container body have an uneven fitting portion which is in close contact with the uneven fitting state, separation between the layers becomes more difficult, and dust and moisture between the layers are removed. The durability against the intrusion of water is further improved.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail. 1 to 3 show one embodiment of a container with a hinge lid integrally formed of different materials according to the present invention. The container of the present embodiment can be used as a suitable container or case for filling or storing small items such as foods, medicines, cosmetics, and jewelry that dislike moisture, as shown in the drawing. A lid 3 is integrally formed on a shallow cylindrical container body 1 via a hinge 2. However, the shape of the container is not limited to a cylindrical shape, and can be formed in any shape such as a polygonal cross section. The container main body 1 is formed by integrally forming a container main body outer wall layer 4 and a container main body inner wall layer 5 made of different materials. The lid 3 is hinged to the container body outer wall layer 4 and is integrally formed of the same material as the container body outer wall layer 4. The container main body outer wall layer 4 and the lid 3 are formed of a hard resin material having excellent hinge characteristics such as polypropylene, and the main body inner wall layer 5 is formed of a soft resin material. As the synthetic resin material forming the outer wall layer of the container body and the lid, besides polypropylene, for example, low-density polyethylene, linear low-density polyethylene and the like are suitable. Further, as the synthetic resin forming the inner wall layer, for example, a thermoplastic elastomer such as a styrene-based elastomer, an olefin-based elastomer, a polyester-based elastomer, and a urethane-based elastomer can be suitably used. However, the synthetic resin material constituting the outer wall layer of the container body and the lid body is not limited to these materials, and may be any material having an excellent hinge characteristic and having a strong strength as the outer layer of the container. As the synthetic resin material, any soft material having excellent sealing properties like the packing may be used.

An annular convex portion 6 is formed on the inner peripheral surface of the container body 1 near the opening end of the container body outer wall layer 4, whereby the container body outer wall layer forms a cavity as described later. An integrally formed annular concave portion is formed integrally with the inner wall layer 5 of the container main body so as to be fitted and adhered to the annular convex portion 6, and the lamination interface between the outer wall layer and the inner wall layer is closely adhered in an annularly uneven state. It has a structure having a concave and convex fitting portion 7.
Thus, the outer wall layer 4 and the inner wall layer 5 made of different materials are hardly separated, and the outer wall layer and the inner wall layer can be effectively prevented from being separated from each other, and the durability against delamination is improved. The opening end of the container body inner wall layer 5 protrudes above the opening end of the container body outer wall layer 4, and the container body side engaging seal portion 8 which engages with the lid side engaging seal portion 10 of the lid 3. Is composed. The container body side engaging seal portion 8 is
An annular recessed portion 9 formed on the lid-side engaging seal portion 10 and having a predetermined fitting margin and engaged by elastic deformation to lock the lid is provided on the outer peripheral portion thereof. The top end surface is locked so as to engage with the notched step surface 12 of the lid 3.

[0008] The structure of the hinge 2 for hinge-connecting the container body 1 and the lid 3 is not particularly limited, and may be any type such as a type having a strap hinge 16 on both sides of a main hinge 15 as shown in the figure. Can be adopted.
The lid 3 has a skirt wall 18 on the outer periphery of the top wall 17, and the lower end of the skirt wall 18 has the lid-side engaging seal portion 1 as described above.
It is 0. The lid-side engagement seal portion 10 has a notch portion 12 formed on its inner peripheral surface with a notch step surface 12 having a depth substantially equal to the thickness of the distal end portion of the container body-side engagement seal portion 8. The inner wall of the notch portion serves as an annular convex portion 11 and is engaged with an annular concave portion 9 formed in the container body side engaging seal portion 8. Reference numeral 19 denotes a finger engaging piece at the time of opening the cover, which is formed on the outer peripheral portion of the skirt wall opposite to the hinge 2.

In the method of forming a container with a hinged lid integrally formed of different materials having the above-described structure, for example, the container inner wall layer 5 is first formed by injection molding, and then the formed container inner wall layer is formed. With the container body inner wall layer 5 forming a part of the cavity of the container body outer wall layer while the container body 5 is held in the mold, the lid 3 is formed integrally with the container body outer wall layer 4 via a hinge by injection molding. Molding by double shot molding method, or two-color molding method in which two sets of injection devices are provided for one set of mold clamping device and two or two types of molding materials are injected simultaneously or sequentially. be able to.

As described above, since the container with the hinge lid of the present invention is formed integrally with the container with the hinge lid made of two kinds of different materials, the container is in close contact with the outer wall layer of the container body and the inner wall layer of the container body without any gap. . Therefore, a container excellent in hygiene and moisture resistance can be obtained without dust or moisture entering between layers. Further, since the inner wall layer of the container body is formed of a soft resin material, the sealing portion between the lid and the container body is excellent in sealing performance, and the contents can be protected from the outside air.
Furthermore, by forming the entire inner wall layer of a soft material, the contents can be protected from impacts and the like, so that it is also suitable as a container or case for accommodating easily damaged articles.

Further, by adopting a synthetic resin having one or more functions of a gas barrier property, an oxygen absorbing property, and a water absorbing property as a soft synthetic resin constituting the sealing wall, different materials having these functions are provided. An integrally formed container with a hinge lid can be obtained. Further, by changing the color of the resin of the inner wall layer and the resin of the outer wall layer, it is possible to obtain a container excellent in fashionability in which the inner wall and the outer wall are different.

In the above embodiment, the seal wall is formed as the inner wall layer of the container body. However, in order to obtain a container having excellent hinge properties and excellent sealing effect, the entire inner wall of the container body is necessarily formed of a soft resin. It is not necessary, and only the seal portion may be formed of a soft resin having excellent sealing properties. FIG. 4 and FIG. 5 show a container with a hinge lid integrally formed of different materials according to another embodiment of the present invention thus formed. The same components as those in the above-described embodiment are denoted by the same reference numerals, and the detailed description is omitted.

The container 20 with a hinged lid integrally formed of dissimilar materials according to the present embodiment has an annular thin portion in which the sealing wall is formed near the upper end of the inner peripheral surface including the upper end of the inner peripheral surface of the cylindrical wall 22 of the container body 21. 24 is formed as a ring-shaped seal wall 23 laminated and formed. That is, the container main body 21 and the lid 3 are formed of a resin having excellent hinge properties, such as polypropylene, as in the above-described embodiment, and the upper end protrudes from the container main body as shown in the inner peripheral surface of the upper end of the opening of the container main body. A ring-shaped seal wall 23 made of a soft resin is integrally formed. An annular thin portion 24 having a predetermined height is formed near the upper end of the cylindrical wall 22 of the container body 21, and a ring-shaped sealing wall 23 is formed on the annular thin portion 24. It is formed by integral molding so as to be flush.

The ring-shaped sealing wall 23 has an annular projection formed on the lid-side engaging seal portion 10 of the lid 3 in the same manner as in the above embodiment, so that the upper end portion constitutes the container body-side engaging seal portion 25. An annular concave portion 25 which engages with the portion 11 by a predetermined fitting margin and elastically deforms to lock the lid, on its outer peripheral portion,
The top end surface is locked so as to engage with the notched step surface 12 of the lid 3. Container 20 with hinge lid of this embodiment
Also, similarly to the above, it can be manufactured by integrally molding a synthetic resin by a double shot molding method or a two-color molding method. In this embodiment, since the seal wall is formed as a ring-shaped seal wall, only a portion necessary for improving the sealing property is formed of a soft resin, and another portion of the inner peripheral surface of the container is formed of a hard resin which is hard to be damaged. be able to. In the case where the seal wall is formed as a ring-shaped seal wall, the adhesion area of the seal wall is reduced, and the mutual adhesion may be insufficient. In such a case, it is desirable to provide a concave-convex fitting portion as shown in the figure particularly at the close contact portion between the container body and the seal wall.

[0015]

As described above, according to the container with a hinge lid integrally formed of different materials according to the first to fifth aspects of the present invention,
By being formed of two types of synthetic resin materials of different materials and utilizing the characteristics of each material, it was possible to simultaneously satisfy the conflicting demands of hinge properties and sealing properties. Moreover, since the seal wall made of the soft synthetic resin and the outer peripheral surface of at least the hard synthetic resin of the container main body are integrally formed, no gap is formed at the interface between the seal wall and the outer peripheral inner surface of the container main body. Thus, a container with an excellent hinge lid was able to be obtained. Also, since it is integrally molded,
Efficient and inexpensive manufacturing compared to separate molding and assembly, without the need for an assembly process or assembly equipment

According to the second aspect of the present invention, since the entire inner wall layer is formed of a soft material, the contents can be protected from impacts and the like, so that a container for accommodating easily damaged items. Alternatively, it is also suitable as a case. According to the third aspect of the present invention, only the part necessary for improving the sealing property can be formed of a soft resin, and the other part of the inner peripheral surface of the container can be formed of a hard resin which is not easily damaged. According to the invention as set forth in claim 4, the soft synthetic resin has these functions by adopting a synthetic resin having one or more functions of gas barrier properties, oxygen absorbing properties, and moisture absorbing properties. It is possible to obtain a container with a hinge lid integrally formed of different materials. Furthermore, according to the fifth aspect of the present invention, since the lamination interface with the seal wall container body is in close contact with the concave and convex fit, the delamination does not easily occur, and the durability is further improved. A container with a hinge lid integrally formed of a material can be obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional front view of a container with a hinge lid integrally formed of different materials according to an embodiment of the present invention in an open state.

FIG. 2 is a plan view thereof.

FIG. 3A is a cross-sectional front view in a closed state, and FIG.
FIG.

FIG. 4 is a cross-sectional front view of a container with a hinge lid integrally formed of different materials according to another embodiment of the present invention in an open state.

FIG. 5A is a sectional front view in a closed state, and FIG.
FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1, 21 Container main body 2 Hinge 3 Lid 4 Container main body outer wall layer 5 Container main body inner wall layer 6 Annular convex part 8, 25 Container main body side engaging seal part 9 Annular concave part 11 Seal convex part 12 Notch step surface 20 Container with hinge lid 22 cylindrical wall 23 ring-shaped seal wall 24 annular thin wall

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hiroshi Shizukuishi 2-12 Nagatoro, Hiratsuka-shi, Kanagawa Japan Inside the Hiratsuka Plant of Japan Crown Cork Co., Ltd. (72) Inventor Seiji Suzuki 2-12 Nagatoro, Hiratsuka-shi, Kanagawa Japan Nippon Crown Cork Inside the Hiratsuka Plant (72) Inventor Tetsuro Ienaga 2-12 Nagatoro, Hiratsuka-shi, Kanagawa Prefecture Japan Crown Cork Co., Ltd. Inside the Hiratsuka Plant (72) Ryuichi Tsukamoto 2-12 Nagatoro, Hiratsuka-shi, Kanagawa Japan Nihon Crown Cork Co., Ltd. F-term in Hiratsuka Plant (reference) 3E061 AA01 AB12 AD09 3E084 AA02 AA12 AA24 AA25 AA26 AA37 AB05 AB09 AB10 BA01 CA01 CC04 CC05 DA01 DB09 DB13 DC04 DC05 FA03 FC07 GA06 GB06 GB17 HA03 HB08 HC03 HD01

Claims (5)

[Claims] 1. A container with a hinge lid having a container body and a hinge lid integrally hinged to the container body,
At least the outer peripheral surface of the container main body and the lid are formed of a synthetic resin having excellent hinge characteristics, and at least the inner peripheral surface of the upper end of the opening of the container main body engages with the lid-side engaging seal portion of the lid. A seal wall having a mating seal portion is provided,
A container with a hinged lid integrally formed of a different material, wherein the seal wall is formed of a soft synthetic resin having excellent sealing properties, and the seal wall and an outer peripheral surface of the container body are integrally formed. 2. The container with a hinged lid according to claim 1, wherein the sealing wall forms an inner wall of the container body laminated on an inner peripheral surface of the container body. 3. The sealing wall according to claim 1, wherein the sealing wall is a ring-shaped sealing wall laminated on an annular thin portion formed near an upper end of an inner peripheral surface including an upper end of an inner peripheral surface of a cylindrical wall of the container body. The container with a hinged lid according to claim 1. 4. The soft synthetic resin constituting the seal wall is a synthetic resin having one or more of a gas barrier property, an oxygen-absorbing property, and a moisture-absorbing property. 4. The container with a hinge lid integrally formed of different materials according to 1. 5. The container with a hinge lid according to claim 1, further comprising an uneven fitting portion in which a lamination interface between the seal wall and the outer peripheral wall of the container body is in close contact with the uneven fitting state.