JP2008290728A - Container for packaging - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a container for packaging of an integrated lid-container body hardly crushed even when the containers filled with food are piled up into multi-stages, and capable of being made of a resin sheet as a material having a reduced thickness. <P>SOLUTION: The container lid consisting of a top face part and a lid side wall part hung down from its peripheral edge, and the container body consisting of a bottom part and a container side wall part formed by raising its peripheral edge, are integrally connected with each other through a hinge part into a plan view polygon to constitute the container for packaging. In the container lid, projecting bottom parts are provided on boundary parts between the top face part and the lid side wall part, and lid ribs are provided on the lid side wall part, and on respective corner parts of the top face part, leg placing step parts with a height lower than other parts are provided. In the container body, thread-cut bottom-like projecting parts are provided on boundary parts between the bottom part and the container side wall part, and container ribs are provided on the container side wall part, and on the corner parts of the bottom part, leg parts expanded downward are formed, and projected bottom parts are provided on the outer peripheries of the leg parts. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention is a container obtained by molding a thermoplastic resin sheet and comprising a container lid composed of a top surface portion and a lid side wall portion depending from the periphery thereof, and a container side wall portion formed by raising the bottom portion and the periphery thereof. The present invention relates to a packaging container (also referred to as a food pack or the like) integrally connected to a main body via a hinge portion.

Conventionally, as a packaging container for packaging fresh fish, meat, fruits, vegetables, cooked foods, etc., the container body made by thermoforming a thermoplastic resin sheet into a desired shape and detachable at its opening A packaging container is commonly used in which a container lid attached to the container is integrally connected via a hinge portion.
This packaging container is packaged by putting food or the like into the container body, folding it at the hinge, and covering the container lid with the container body opening to fit. The packaged products are often stacked and displayed in multiple stages. For this reason, the container body of the packaging container not only requires a certain level of mechanical strength, but the container lid also has a mechanical strength that is not crushed when stacked in multiple stages as described above (particularly compression resistance). It is desired to have.

As a method for increasing the rigidity of a packaging container in which a thermoplastic resin sheet is molded, a technique for forming a thread end at the bottom of the packaging container is disclosed (for example, see Patent Documents 1 and 2).
Usually, a thread end is often provided at a position slightly inside from the boundary between the bottom and the side wall. In this case, even if the yarn bottom is formed, if the pressure is applied from above, the yarn bottom is pushed down inward, so that the effect of improving the rigidity of the bottom of the container is hardly exhibited.

Further, Patent Document 3 discloses a container lid that is obtained by molding a thermoplastic resin sheet and includes a top surface portion and a side wall portion that hangs down from the top surface portion. And a rib that extends downward in close contact with or close to the yarn tail-shaped convex portion, and the container lid, and the container lid and the opening portion on the side wall. A packaging container comprising a container body that can be detachably attached to the container is disclosed.
JP-A-57-43807 JP 2006-334972 A Utility Model Registration No. 3131449

In recent years, the thickness of packaging containers has been reduced in consideration of environmental problems.
In a normal lid-type packaging container, the container body is molded using a relatively thick resin sheet in order to obtain strength and rigidity that can withstand the load of the contents, while the lid has good transparency. It is molded using a relatively thin resin sheet. On the other hand, the packaging container (food pack) in which the lid and the container main body are integrated is formed of the same resin sheet as the lid and the container main body. There was a tendency to be thin, and further thinning was difficult.

  Further, Patent Document 3 discloses a packaging container in which a thread tail-like convex portion and a rib are provided on a lid and a bottom portion. However, in sheet molding, the thickness tends to be thinner than other portions of the bottom peripheral edge portion. Since there are no thread-like projections on the foot, improving the strength of the foot has been a problem.

  The present invention provides a packaging container integrated with a lid / container body that can be easily crushed even when stacked in multiple stages when containers containing food are stacked, and can reduce the thickness of the resin sheet of the material. Objective.

In order to achieve the above object, the present invention is obtained by molding a thermoplastic resin sheet, and is formed by raising a container lid composed of a top surface portion and a lid side wall portion hanging from the periphery thereof, and a bottom portion and its periphery. A container for packaging in a polygonal shape in plan view in which a container main body composed of a container side wall part is integrally connected via a hinge part,
The container lid is provided with a thread tail-like convex part at a boundary part between the top surface part and the lid side wall part, and a part of the lid side wall part is in contact with or close to the thread tail-like convex part. A lid rib is provided along the direction, and a stepping step portion having a height lower than that of the other portion is provided at each corner of the top surface portion,
The container body is provided with a thread tail-like convex part at the boundary between the bottom part and the container side wall part, and a part of the container body part is in contact with or close to the yarn bottom-like convex part in the vertical direction of the container side wall part. A container rib is provided along the bottom, and a foot part bulging downward is formed at each corner of the bottom part, and a thread tail-like convex part is provided on the outer periphery of the foot part. Providing a container for use.

  In addition, the lid rib and the container rib are arranged so that when the load is applied to the container lid from above in a packaging state where the opening of the container body is covered with the container lid, each end of the lid rib and the container rib is It is preferable to have a structure that abuts and supports the load.

In the packaging container of the present invention, the vertical and ribs are formed on the container lid and the container main body, respectively, so that the strength and rigidity of the molded container are improved. In particular, when packaging containers containing foods are stacked and displayed, they are not easily crushed even when stacked in multiple stages. Moreover, since the strength and rigidity of the molded container can be improved, the resin sheet to be used can be thinned.
In addition, the foot formed at the corner of the container body has a strong tendency to be stretched particularly during molding, so the edge of the foot becomes thin and easily collapses during stacking, but a thread-like projection is formed on the outer periphery of the foot As a result, the strength of the foot is improved, and the foot is less likely to collapse during stacking.
In addition, when a load is applied to the container lid from above in the packaged state, it is possible to more strongly support the load from above by adopting a structure in which each end of the lid rib and the container rib abuts to support the load. .

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1-3 is a figure which shows one Embodiment of the packaging container of this invention, FIG. 1 is a top view of the packaging container 1 of this embodiment, FIG. 2 is a front view of the packaging container 1, FIG. 3 is an enlarged cross-sectional view of a portion A in FIG. In these drawings, reference numeral 1 is a packaging container, 2 is a container lid, 3 is a container body, 4 is a hinge part, 5 is a top surface part, 6 is a lid side wall part, 7 is a bottom part, 8 is a container side wall part, and 9 is a container side part. Yarn bottom convex part, 10 is a lid rib, 11 is a container rib, 12 is a footrest step, 13 is a foot part, 14 is a flange, 15 is a fitting convex part, 16 is a fitting step part, 17 is a rib is there.

  The packaging container 1 of the present embodiment is obtained by molding a thermoplastic resin sheet, and a container lid 2 including a top surface portion 5 and a lid side wall portion 6 hanging from the periphery thereof, and a bottom portion 7 and its periphery are raised. The container main body 3 including the container side wall portion 8 formed in this manner is configured to form a substantially rectangular shape in plan view in which the container main body 3 is integrally connected via the hinge portion 4. The shape of the packaging container 1 is not limited to this example, but may be a quadrilateral other than a rectangle such as a rhombus, a parallelogram, or a trapezoid, or a polygon that is a pentagon or more.

  The container lid 2 is provided with a thread tail-like convex portion 9 at the boundary between the top surface portion 5 and the lid side wall portion 6, and a part of the container lid 2 is in contact with or close to the yarn bottom-like convex portion 9. A large number of lid ribs 10 are provided along the vertical direction of the lid side wall portion, and a footrest step portion 12 having a height lower than that of the other portion is provided at each corner portion of the top surface portion 5.

  The container body 3 is provided with a thread tail-like convex portion 9 at the boundary portion between the bottom portion 7 and the container side wall portion 8, and a part of the container body 3 is in contact with or close to the yarn bottom-like convex portion 9. A number of container ribs 11 are provided along the vertical direction of the container side wall, and a foot 13 bulging downward is formed at each corner of the bottom 7. Part 9 is provided. A large number of ribs 17 are provided on the bottom 7 of the container body 3.

  The thermoplastic resin sheet constituting the packaging container 1 is a thermoplastic resin sheet used in conventionally known packaging containers, such as polystyrene resin sheet, polyethylene resin sheet, polypropylene resin sheet, polyethylene terephthalate. Any thermoplastic resin sheet such as a resin-based resin sheet may be used, and is not particularly limited. Usually, a transparent thin thermoplastic resin sheet is used. The packaging container 1 is manufactured by thermoforming (vacuum forming, pressure forming, vacuum / pressure forming, hot plate forming, etc.) the thermoplastic resin sheet. In manufacturing the packaging container 1, the yarn tail-shaped convex portion 9 can be formed using, for example, the manufacturing apparatus and the manufacturing method disclosed in Patent Document 1 and Patent Document 2.

  In this embodiment, as shown in FIG. 3, the yarn bottom-like convex portion 9 formed on the packaging container 1 and the container lid 2 rises in the vertical direction from the end of the top surface portion 5, the bottom portion 7, or the foot portion 13. It is folded at the top and hangs down to a height substantially equal to that of the top surface 5, bottom 7 or foot 13, and is connected to the lid side wall 6 or the container side wall 8. In the present embodiment, the yarn bottom inner wall 92 and the yarn bottom outer wall 91 that constitute the yarn bottom rib convex portion 9 are folded back apart from each other, but may be in close contact with each other.

  In the present embodiment, the yarn tail-like convex portion 9 formed on the container lid 2 is provided over the entire circumference of the boundary portion between the top surface portion 5 and the lid side wall portion 6 and the inner edge portion of the footrest step portion 12. As a result, the entire circumference of the top surface portion 5 and the lid side wall portion 6 is reinforced by the yarn bottom-like convex portion 9, and the compression resistance of the container lid 2 can be improved over the entire top surface portion 5.

  In the present embodiment, the yarn tail-like convex portion 9 formed on the container body 3 is provided over the entire circumference of the boundary portion between the bottom portion 7 and the container side wall portion 8 and the inner edge portion of the foot portion 13. As a result, the entire circumference of the bottom 7 and the container side wall 8 is reinforced by the thread tail-like convex portion 9, and the compression resistance of the container body 3 can be improved over the entire bottom 7. Further, since the bottom portion 7 is provided with the ribs 17 that are in contact with or close to the yarn tail-like convex portion 9, the compression resistance of the bottom portion 7 can be further enhanced.

  In the present embodiment, the foot portion 13 provided at each corner of the bottom portion 7 is provided with a thread tail-like convex portion 9 along the outer periphery of the foot portion 13. Thereby, the foot part 13 whose thickness tends to be thinner than the other part of the bottom peripheral edge in the sheet molding is effectively reinforced by the thread tail-like convex part 9, and the foot part 13 is less likely to be crushed. A high packaging container 1 can be provided.

  In the present embodiment, the lid rib 10 and the container rib 11 are arranged so that when the load is applied to the container lid 2 from above in the packaging state in which the opening of the container body 3 is covered with the container lid 2, the lid rib 10 and the container rib 11. Each end abuts to support the load. Accordingly, the compression resistance of the packaging container 1 can be further improved together with the compression resistance improvement effect of the yarn tail-shaped convex portion 9.

  The packaging container 1 according to the present embodiment is provided at the opening of the container body 3 by placing an object to be packaged such as food in the container body 3, bending the hinge portion 4, and covering the opening of the container body 3 with the container lid 2. By fitting the fitting step 15 on the container lid 2 side with the fitting projection 15, the container body 3 is in a packaging state in which the opening of the container body 3 is closed by the container lid 2. In addition, the fitting structure of the container main body 3 and the container lid 2 is not limited to this illustration, but various fitting methods conventionally known in the field of packaging containers, for example, an inner fitting method, an outer fitting method, Either an internal or external fitting method can be adopted.

  In the packaging container 1 of the present embodiment, the container lid 2 is provided on the lid side wall portion 6 and its surroundings so that a part of the food is not caught when the lid is closed and water droplets attached to the container lid 2 do not flow out. A groove (inward) that is recessed downward from the extended flange portion may be provided. Although the lid rib 10 rises from this groove, it is preferable that a groove is not formed at the corner, and a surface inclined upward is formed between the lid rib 10 and the flange 14. With such a structure, the corners are less likely to be deformed or crushed when stacked.

The packaging container 1 according to this embodiment is formed by forming vertical ribs (lid ribs 10 and container ribs 11) on the container lid 2 and the container body 3, respectively, on the yarn tail protrusions 9 and the side walls. The strength and rigidity of the container 1 are improved. In particular, when packaging containers 1 containing foods are stacked and displayed, they are not easily crushed even when stacked in multiple stages. Moreover, since the intensity | strength and rigidity of the shape | molded packaging container 1 can be improved, the thickness of the resin sheet to be used can be reduced.
Further, the foot 13 formed at the corner of the container body 3 has a strong tendency to be stretched particularly at the time of molding, so that the edge of the foot becomes thin and easily collapses during stacking. By forming the portion 9, the strength of the foot portion 13 is improved, and the foot is not easily crushed during stacking.
In addition, when a load is applied to the container lid 2 from above in the packaged state, the ends of the lid rib 10 and the container rib 11 come into contact with each other to support the load, thereby supporting the load from above more strongly. be able to.

It is a perspective view of the container lid of one embodiment of the present invention. It is a side view of the packaging container of one Embodiment of this invention. It is an expanded sectional view of the A section of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Container for packaging, 2 ... Container lid, 3 ... Container main body, 4 ... Hinge part, 5 ... Top surface part, 6 ... Lid side wall part, 7 ... Bottom part, 8 ... Container side wall part, 9 ... Yarn bottom convex part, DESCRIPTION OF SYMBOLS 10 ... Lid, 11 ... Container rib, 12 ... Footrest step part, 13 ... Foot part, 14 ... Flange, 15 ... Fitting convex part, 16 ... Fitting step part, 17 ... Rib

Claims (2)

A container body, which is obtained by molding a thermoplastic resin sheet and has a top surface portion and a lid side wall portion hanging from the periphery thereof, and a container body consisting of a bottom portion and a container side wall portion formed by raising the periphery thereof is a hinge. A polygonal packaging container connected in a unitary manner via a section,
The container lid is provided with a thread tail-like convex part at a boundary part between the top surface part and the lid side wall part, and a part of the lid side wall part is in contact with or close to the thread tail-like convex part. A lid rib is provided along the direction, and a stepping step portion having a height lower than that of the other portion is provided at each corner of the top surface portion,
The container body is provided with a thread tail-like convex part at the boundary between the bottom part and the container side wall part, and a part of the container body part is in contact with or close to the yarn bottom-like convex part in the vertical direction of the container side wall part. A container rib is provided along the bottom, and a foot part bulging downward is formed at each corner of the bottom part, and a thread tail-like convex part is provided on the outer periphery of the foot part. Container.   The lid rib and the container rib contact each end of the lid rib and the container rib when a load is applied to the container lid from above in a packaging state where the opening of the container body is covered with the container lid. The packaging container according to claim 1, wherein the container is configured to contact and support a load.

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