JP2003095344A - Paper tray - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packaging container which can keep freshness of fresh food such as raw shiitake mushrooms or strawberries, can prevent them from drying and can prevent contents from deforming or getting damaged by an external pressure and further which can serve for use as a gift or the like. SOLUTION: The tray-formed container is formed of a paper blank and comprises a bottom and sidewalls folded to stand from the bottom and coupled with one another. End faces of the four sidewalls form a gentle circular swell at an upper end.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper tray suitable for containing, for example, fresh shiitake mushrooms, strawberries and other fresh food materials.

[0002]

2. Description of the Related Art Conventionally, as a small amount packaging form of mushrooms, fruits and vegetables such as strawberries, such as shiitake mushrooms, maitake mushrooms, mushrooms and shimeji mushrooms, a plastic tray is stretch-wrapped overwhelmingly in many cases. , Tray materials are rigid polyvinyl chloride, expanded polystyrene, expanded polystyrene, etc.
Soft polyvinyl chloride, polyethylene film, etc. are used. Other than the plastic tray, there is a cardboard assembly container for packaging chicken eggs, fruits and vegetables as described in Japanese Utility Model Publication No. 58-12761, for example.
Further, Japanese Utility Model Publication No. 62-80870 discloses a molded container for fresh food using a laminated material obtained by coating a base material such as plastic with an absorbent resin.

[0003]

However, when fresh shiitake mushrooms are stored in a plastic tray and stretch-wrapped, the fresh shiitake mushrooms may be stuffy and air retention in the container may lead to generation of aerial mycelia. When the fresh shiitake mushrooms were stored in a plastic tray and stretch-wrapped, the end faces of the rising portions were straight and the stretch fill was often broken. The tray-shaped container for storing strawberries is usually made of plastic as described above, but recently, as an ecological measure, there is a demand to use a paper tray instead of the plastic tray. However, the paper tray has a problem that when it contains a lot of water such as strawberries, it absorbs water and loses its rigidity, and there is also a problem that the cushioning function disappears. There is also a problem that the contents are apt to be damaged, and further, the contents having such a high moisture content come into direct contact with the paper container to facilitate the propagation of microorganisms, which accelerates the decay of the contents. So, raw shiitake mushrooms,
The freshness of fresh ingredients such as strawberries can be maintained without drying them,
It is possible to prevent the contents from being deformed or damaged by external pressure.
Provide a packaging container that can be used for gifts and the like. In addition, when the contents are put in a conventional plastic tray and stretch-wrapped, the end face is linear, the film is cut unexpectedly at times, and the efficiency is poor in automatic packaging.

The present invention has been made in view of such circumstances, and is a fresh food material containing water, particularly fresh shiitake mushrooms,
The purpose is to enable the use of paper trays as containers for strawberries and the like. Another object of the present invention is to provide a paper tray that prevents the rigidity of the container from being lowered by the moisture discharged from the contents.

[0005]

[Means for Solving the Problems] In order to achieve the above object, fresh food such as fresh shiitake mushrooms such as strawberries of the present invention can be kept fresh and prevented from being dried and prevented from being deformed or damaged by external pressure. In addition, a packaging container that can be used for gifts and the like is also provided. A tray-shaped container formed of a paper blank and having a bottom portion and side walls folded from the bottom portion and connected to each other, wherein four side wall end surfaces form loose circular ridges at the upper end, and Provides a paper tray whose blank is cardboard.

[0006]

In the paper tray of the present invention, the cardboard paper absorbs the moisture from the contents, the inner paper absorbs the moisture a little, and the intermediate layer absorbs a little moisture to the outer paper. Long-term protection, which prevents the tray body from absorbing moisture and losing rigidity. In addition, the cardboard acts as a cushioning material, preventing deterioration of the contents due to impact. Further, when the contents are put in a paper tray and stretch-wrapped, the upper end surface of the opening is provided with a circular ridge so that the film can be evenly adhered uniformly.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view of a paper tray according to an embodiment of the present invention, FIG. 2 is a plan view of the paper tray, and FIG. 3 is a sectional view.
In the paper tray of this embodiment, a single paper blank is folded to form a substantially rectangular bottom portion 1 and a pair of side walls 2a and 2b on the long side and the short side folded from the bottom portion 1, The tray main body is formed by folding back the extension portions 3 on both sides of each side wall 2a on the long side and gluing it to the outer surface of the adjacent side wall 2b on the short side.

A gentle circular protrusion 4a is formed on the upper end of the end surface of each side wall 2a on each long side, and a gentle circular raised portion 4b is formed on the upper end of the short surface of each side wall 2b on each short side. 50m radius
An arc of m to 2,000 mm is suitable.

FIG. 3 is a sectional view of the paper tray. One paper blank has a three-layer structure. That is, it is composed of the inner layer 5, the intermediate layer 6, and the outer layer 7.

The inner layer 5 and the outer layer 7 are made of the same material and have the same thickness. The intermediate layer 6 has a corrugated plate shape peculiar to cardboard paper. Three
Since it has a layered structure, since the intermediate layer has a corrugated plate shape in particular, an air layer is sufficiently formed.

The case where the fresh shiitake mushrooms are stored in this paper tray and stretch-wrapped will be described. As the stretch film, soft polyvinyl chloride or polyethylene film is used. Put about 6 shiitake mushrooms in a paper tray and cover the film from above. In this case, since the upper end of the side wall is gentle and the ridges 4a and 4b are circular, the film hits the uppermost end of the arc. After that, the film gradually covers the entire surface.

With conventional plastic trays, the edges are straight, and the film no longer unexpectedly cuts.

Especially when stretch-wrapping is automatically performed by a mechanical device, the film is prevented from being cut unexpectedly, which improves efficiency.

The paper tray of the present invention can be printed on the outer surface and the outer bottom freely, and can be said to be a tray with high sales promotion. Displaying the place of origin or product name on the outer side,
Various decorations are given, the producer's name on the outer side or the outer bottom,
By printing cooking methods and recipes, printing can be done more freely than with conventional plastic trays.

[0015]

The present invention is constituted as described above, and can prevent the rigidity of the paper tray from being lowered by the moisture coming out from the contents such as fresh shiitake mushrooms and strawberries, and also the deterioration of the contents due to the buffering action. prevent. Further, the cardboard paper absorbs moisture, so that the freshness of the contents can be maintained for a long time. This paper tray is in a small amount packaging form at the time of distribution and sale of mushrooms such as fresh shiitake or fruits and vegetables such as strawberries. At that time, the moisture discharged from the contents is first absorbed by the inner layer 5 of the cardboard paper and then reaches the intermediate layer 6, but since the intermediate layer 6 has a corrugated plate shape, the outer layer 7 is not affected by the moisture. It takes time to achieve. In addition, since there is a corrugated plate-like air layer, the water absorbency is several times that of plain paper. The paper tray of the present invention as a whole can absorb moisture, prevent the contents such as shiitake from decaying, and prevent the rigidity from being lost. Deterioration of objects is prevented. Especially when stretch-wrapping is automatically performed by a mechanical device, the film is prevented from being cut unexpectedly, which improves efficiency.

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[Procedure amendment]

[Submission date] November 21, 2001 (2001.11.
21)

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 is a perspective view.

2 is a plan view

FIG. 3 is a sectional view.

[Explanation of symbols] 1 bottom 2a Long side wall 2b Short side wall 4a 2a top ridge 4b 2b top ridge 5 inner layer 6 Middle class 7 outer layer

Claims (2)

[Claims] 1. A tray-shaped container comprising a bottom formed of a paper blank and side walls folded up from the bottom and connected to each other, wherein four side wall end faces have loose circular ridges at their upper ends. A paper tray characterized by being formed. 2. The paper tray according to claim 1, wherein the paper blank is cardboard.