JP2003128044A - Paper-made tray-shaped container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paper-made tray-shaped container having no differential and clearance in a flange part. SOLUTION: The container comprises a container body (10) in which the upper face (11) is opened and is larger than the bottom face (12), and a frame body (20) having a frame plate (21) on the outer periphery and in which an auxiliary plate (22) is provided inside the frame body with a folding line (a) so that the adjacent sides extended inwardly become adjacent with a cut line (b). An open window (23) which is surrounded by the frame plate provided by applying the mountain folding to the folding line of the frame body is formed roughly the same as the upper face of the container body. The container body (10) is dropped in the open window of the frame body (20) from the bottom face. The inner face of the auxiliary plate is joined with the outer face of a side face plate (13) so that the frame plate (21) of the frame body and the upper end of a side face plate of the container body become at grade.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper tray container having a side plate with a flange portion at its tip edge and having a larger area on the upper surface than on the bottom surface. The present invention relates to a paper tray-shaped container having no steps.

[0002]

2. Description of the Related Art Conventionally, a composite tray in which a thermoplastic film is laminated on the inner surface of a paper tray having a flange portion by a molding method such as a pressure molding method, a vacuum molding method, or a pressure air vacuum molding method has been distributed. There is.

For example, as shown in FIGS. 3 (a) and 3 (b), the paper tray used for this composite tray is designed to have a horizontal flange portion (101) and a vertical flange portion (101) when a blank sheet is assembled into the tray. The flange portions (102) in the same direction are overlapped with each other, resulting in a step difference of about paper thickness. Alternatively, the horizontal flange portion and the vertical flange portion are in a state of abutting each other, and a gap is generated. These steps and gaps in the butted part are not completely eliminated even when the thermoplastic tray is laminated from above to form a composite tray. In some cases, wrinkles or pinholes were generated from the stepped portion or the gap, resulting in poor sealing.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems relating to a composite tray in which a thermoplastic film is laminated on the inner surface of a paper tray having a flange portion. It is an object of the present invention to provide a paper tray-like container having no steps or gaps.

[0005]

The invention according to claim 1 of the present invention comprises a container body having an open upper surface and a larger upper surface than the bottom surface, and a frame plate on the outer periphery, and a fold line inside the frame plate. And a frame body provided so that adjacent sides extending inwardly are adjacent to each other through a cutting line, and a frame plate obtained by mountain-folding the bending line of the frame body. The enclosed open window is formed almost the same as the upper surface of the container body, and the container body is dropped from the bottom surface into the open window of the frame body, and the frame plate of the frame body and the upper edge of the side plate of the container body are on the same plane. In this way, the paper tray-shaped container is characterized in that the inner surface of the auxiliary plate and the outer surface of the side plate of the container body are joined together.

As described above, according to the first aspect of the invention, the inner surface of the auxiliary plate and the outer surface of the side plate of the container body are arranged so that the frame plate of the frame body and the upper edge of the side plate of the container body are on the same plane. Since it is joined to the side surface, the frame plate of the frame body becomes the flange portion of the finished paper tray-like container, and all the flange portions are on the same plane, and there are no steps or gaps.

Further, since the container body is supported so as to be pushed in from the outside by the frame body, there is little risk of the container body and the frame body being separated from each other even if the container is filled with relatively heavy contents.

A second aspect of the present invention is the paper tray-shaped container according to the first aspect of the present invention, wherein the container body and the frame have a rectangular shape.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The paper tray-shaped container of the present invention will be described below in detail based on one embodiment. The paper tray-shaped container of the present invention has, as shown in, for example, FIG. 1 and FIG.
Has a large container body (10) and a frame plate (21) on the outer periphery, and an auxiliary plate (22) is cut inside the frame plate through a bending line (a) so that adjacent sides extending outward are cut. And a frame body (20) provided so as to be adjacent to each other via a line (b).

An open window (23) surrounded by a frame plate obtained by mountain-folding the bending line (a) of the frame body is formed substantially the same as the upper surface of the container body.

The container body (10) is then attached to the bottom surface (12).
From the inside into the open window (23) of the frame (20), and the inner side of the auxiliary plate (22) so that the frame plate (21) of the frame and the side plate (13) of the container body are flush with each other. And the outer surface of the side plate (13) of the container body are joined together to form the paper tray-like container (1) of the present invention.

In the paper tray-like container having such a structure, since the frame body (21) forms the flange portion,
There are no gaps due to steps or abutting parts. Therefore, it becomes a paper tray-like container excellent in hermetic sealing property.

As a blank material for the container body (10) and the frame body (20), paperboard such as cup base paper, coated card, coated ball, coated Manila, and ivory can be preferably used. If necessary, a printing layer (not shown) or an overcoat varnish layer (not shown) can be provided on the surface that becomes the outer surface when assembled in a paper tray-shaped container. The printing layer may be provided on the inner surface of the paper tray-shaped container when assembled.

The container body (10) and the frame body (20) are generally punched simultaneously with the process of forming a folding line, a cutting line and an open window from a paperboard made of a material.

The inner side surface of the auxiliary plate (22) of the frame body and the outer side surface of the side surface plate (13) of the container body may be joined by a generally known joining method such as glueing or hot melt.

In general, a thermoplastic tray is laminated on the inside of the paper tray-like container by a forming method such as vacuum forming or pressure forming to form a composite tray.

As the thermoplastic sheet, a deep-drawable polyethylene, polypropylene, polystyrene, ethylene vinyl alcohol copolymer film of about 100 to 400 μm, a polyethylene terephthalate film, a nylon film, a polypropylene film, or the like can be used. A vapor-deposited film obtained by vapor-depositing a thin film of silicon oxide, aluminum oxide or the like on the order of 40 nm by a vacuum vapor deposition method or the like can be preferably used.
Further, a laminated film laminated sheet obtained by appropriately selecting and combining these single films can also be used.

In this way, the composite tray obtained by laminating the above-mentioned thermoplastic sheet inside the paper tray-like container of the present invention has no step or abutting at the flange portion, and thus is completely flat, The sealing property with the lid material that covers the upper surface of the tray becomes particularly excellent.

[0019]

As described above, since the paper tray-shaped container of the present invention has no step or butt on the flange portion, it is possible to obtain a composite tray having an excellent hermetic sealing property. Although the container body and the frame are separate bodies, the flange of the tray-shaped container is difficult to peel off because the frame body has a structure that pushes the container body into the body even when filling relatively heavy contents. . Since the container and the flange part are separated from each other, different papers and layer configurations can be used, which facilitates cost reduction.

[Brief description of drawings]

FIG. 1 shows an embodiment of a paper tray container of the present invention,
FIG.

FIG. 2 is a diagram showing a paper tray-shaped container of the present invention, (a)
FIG. 4 is a front explanatory view showing an example of the container body,
(B) is an explanatory plan view showing an example of the frame body,
(C) is sectional explanatory drawing which shows the state which bent the auxiliary board of (b).

FIG. 3 is a plan explanatory view showing a conventional paper tray-shaped container, and FIG. 3 (b) is a sectional explanatory view in which (a) is assembled.

[Explanation of symbols]

1 ... Paper tray container 10: Container body 11 ... Top 12 ... bottom 13 ... Side plate 20 ... Frame 21 ... Frame plate 22 ... Auxiliary plate 23..open window 101 ... Horizontal flange 102 ... Vertical flange a ... Bending line b ... Cutting line

Claims (2)

[Claims] 1. A container main body having an open upper surface and a larger upper surface than a bottom surface, and a frame plate on the outer periphery, and auxiliary plates extending inwardly inside the frame plate with adjacent auxiliary lines extending inward. And a frame body provided so as to be adjacent to each other via a cutting line, and an open window surrounded by a frame plate obtained by mountain-folding the folding line of the frame body is substantially the same as the upper surface of the container body. The container body is dropped into the open window of the frame from the bottom, and the inner surface of the auxiliary plate and the side plate of the container body are placed so that the frame plate of the frame and the upper edge of the side plate of the container body are on the same plane. A paper tray-shaped container characterized by being joined to the outer surface. 2. The paper tray-shaped container according to claim 1, wherein the container body and the frame have a rectangular shape.