JP2020132251A - Paper container - Google Patents

Abstract

To allow a hand with an opening knob part not to be burned by high-temperature steam, when opening a lid material of a paper container heated with a microwave oven.SOLUTION: There is provided a paper container (1) comprising a tray (2) formed from a multi-layered sheet as a paper substrate, and a lid material (3) fused to a peripheral edge of the tray. The lid material comprising a knob part (41) formed from an unsealed part outside a peripheral edge seal part of an opening starting point (4) separates an outer edge of the knob part 10 mm or more to outside from an outer edge of the peripheral edge seal part; and a foldable ruled line (42) is provided between the knob part and the outer edge of the peripheral edge seal part, and the tray is provided with a cut (22) in parallel to the foldable ruled line is provided between the foldable ruled line and the outer edge of the peripheral edge seal part.SELECTED DRAWING: Figure 1

Description

The present invention relates to a paper container that can be cooked by dielectric heating with a microwave oven or the like.

When food contains dipoles such as water, it can be heated to a high temperature by giving high energy by dielectric heating of microwaves. Microwave oven containers that are cooked by such heating are convenient for individual meals, and their range of use is expanding.
Since the microwave oven container is disposable, it is required to be easy to heat, easily dispose of after use, inexpensive, and easy to use.
In addition, the cooking time is almost constant while the steam generated by heating is gradually released by covering it with a lid material so that it can be heated in a sealed state so that it can be easily heated in a short time. By holding it in, efficient heating can be performed.

Such a microwave oven heating container is described in, for example, in Patent Document 1.
Side plates are connected to the two opposite sides of the square bottom plate via mountain fold lines, and edge pieces are connected to the outer circumference of the side plates via valley fold lines, and the left and right ends of the edge pieces. Each of the tongue pieces extending in the lateral direction is provided, and inverted triangular fold-in joint plates are continuously provided at the left and right ends of the side plate via mountain fold lines, and valley folds are provided on the outer periphery of the fold-in joint plate. Joint edge pieces are connected via a wire, and a second side plate is connected via a mountain fold line on each of the other two opposite sides of the bottom plate, and a valley fold is formed on the outer circumference of the second side plate. A second edge piece is continuously provided via a line, a second tongue piece extending in the lateral direction is provided at each of the left and right ends of the second edge piece, and a valley fold line is provided at each of the left and right ends of the second side surface plate. A second fold-in joint plate having an inverted triangular shape is continuously provided therethrough, and the end edge of the fold-in joint plate that is not connected to the side plate and the second side plate of the second fold-in joint plate are continuously provided. The other end edge is connected through a mountain fold line, and when each side plate is bent and assembled into a tray shape, the edge piece, the second edge piece, and the joint edge piece form the same plane. A blank for a tray container that is set so as to project toward the second folding joint plate at the edge of the second tongue piece near the contact between the second tongue piece and the second folding joint plate at each corner. We are proposing a blank for tray containers, which is characterized by being provided with small protrusions.

However, the tray container produced from the blank is a container used for packaging frozen foods and powders, not a container for heating. Therefore, when the tray container is heated in a microwave oven, the pressure inside the container rises as the temperature rises, and when the container is opened, steam is suddenly ejected from the opening of the lid material, and there is a high risk of burns.

Japanese Patent No. 38534116

Therefore, it is an object of the present invention to prevent the hand holding the opening knob from being burned by high-temperature steam when opening the lid material of the paper container heated by the microwave oven.

The paper container of the present invention
In a paper container composed of a tray made of a multi-layer sheet made of paper as a base material and a lid material fused to the peripheral edge of the tray.
The lid material has a knob portion made of an unsealed portion on the outside of the peripheral sealed portion at the opening starting point.
The outer edge of the knob is separated from the outer edge of the peripheral seal portion by 10 mm or more to the outside.
In addition, a bent ruled line is provided between the knob and the outer edge of the peripheral seal.
The tray is a paper container characterized in that a cut parallel to the fold ruled line is provided between the fold ruled line and the outer edge of the peripheral edge seal portion.

In the paper container of the present invention, the tray base material is provided with a cut parallel to the fold ruled line between the fold ruled line and the outer edge of the peripheral seal portion. Therefore, after the tray half-cut portion that triggers opening is separated, the cut is provided. The lid material delaminates the paper layer of the tray from the cut portion, detaches from the tray, and can be easily opened.
Moreover, since the knob portion in the vicinity of the opened opening is bent upward perpendicularly to the fusion surface with the tray by the bent ruled line, there is no possibility that the water vapor ejected from the paper container directly hits the finger.

It is a perspective view of the appearance which shows the closed state and the partially opened state in the Example of the paper container which concerns on this invention. In the embodiment of the paper container according to the present invention, it is a plan view in a closed state, a cross-sectional view in the vicinity of an opening, and a front view. It is a cross-sectional view of the vicinity of the opening of the paper container which concerns on this invention, and is the figure which shows the opening process. It is a developed view which shows the shape of the tray and the lid material of the paper container evaluated in the Example and the comparative example of this invention.

Hereinafter, embodiments of the paper container of the present invention will be described with reference to the drawings.
FIG. 1 is an example of an embodiment of a paper container according to the present invention, and is a perspective view of an external appearance showing a closed state and a partially opened state.
FIG. 1-1 is a perspective view showing the appearance of the paper container in a sealed state according to the present invention. The paper container 1 is a tray 2 made of a multi-layer sheet made of paper as a base material, and a lid material fused to the periphery of the tray. It is composed of 3.
The paper container 1 is provided with an opening opening point 4 for opening the lid material 3, and has a knob portion 41 formed of an unsealed portion on the outside of the peripheral sealing portion of the opening starting point 4.

FIG. 1-2 is a perspective view showing a state in which the paper container 1 is partially opened, and the grip portion 41 is raised and pulled upward to open the container.
A microwave oven that is dielectrically heated by microwaves is a heating method in which when there is a substance having a dipole such as water, energy is given and excited to actively vibrate or rotate the dipole.
When the paper container 1 is dielectrically heated in this way, the moisture and the like contained in the food inside the paper container 1 acquires high energy, becomes high temperature, becomes steam, and the internal air pressure rises.
When the inside of such a container becomes hot and the internal air pressure rises, the entire paper container swells.
In this state, when the grip portion 41 of the lid material 3 is lifted in the direction perpendicular to the opening of the tray 2 and the opening is started, the water vapor 5 inside the paper container 1 is ejected from the opening portion at once.

FIG. 2-1 is an example of an embodiment of the paper container 1 according to the present invention, a plan view in a closed state and a cross-sectional view in the vicinity of an opening, and FIG. 2-2 is a front view of the paper container 1.
The tray 2 and the lid material 3 are fused at the peripheral edge sealing portion 21 at the peripheral edge of the opening of the tray 2.
Further, at the opening starting point 4, the knob portion 41 protrudes outward from the end portion of the tray 2, and a linear bent ruled line 42 is provided in the vicinity of the base of the knob portion 41 in a direction perpendicular to the opening direction. There is. Further, a cut 22 of the tray base material parallel to the folding ruled line 42 is provided between the folding ruled line 42 and the outer edge 211 of the peripheral edge seal portion.

FIG. 3 is a cross-sectional view of the vicinity of the opening of the paper container according to the present invention, and is a diagram showing the opening process thereof. FIG. 3-1 is a cross-sectional view showing a sealed state before opening.
The inner surface of the knob portion 41 is an unsealed portion that does not fuse with the tray 2.
A fold ruled line 42 is provided between the knob portion 41 and the outer edge 211 of the peripheral edge seal portion, and a half-cut tray base material cut 22 is provided inside the fold ruled line 42 in parallel with the fold ruled line 42. ..
Since paper is used as the lid base material layer 31 inside the lid material 3, the bent ruled line 42 can be easily processed. Further, at least on the inner surface, there is a lid sealant layer 32, which can be easily fused to the tray flange surface.
By the way, in the tray 2, paper is used for the tray base material layer 23, and the tray sealant layer 24 is provided on the innermost layer thereof. The cut 22 of the tray base material is a half cut that cuts the tray sealant layer 24 and penetrates into the tray base material layer 23, so that the structure is easy to open.

FIG. 3-2 is a cross-sectional view showing a state in which the grip portion 41 is lifted at the opening opening point 4. At the opening starting point 4, the knob portion 41 is bent at the bent ruled line 42 and lifted upward, so that the knob portion 41 is bent in a substantially vertical direction.

FIG. 3-3 is a cross-sectional view showing a state in which the grip portion 41 bent in the vertical direction is further lifted in the vertical direction with respect to the opening surface of the tray 2 to which the lid material 3 is fused, and the opening is started.
Since the cut 22 of the tray 2 base material has penetrated into the base material layer 23, when the knob 41 is lifted in the vertical direction, delamination occurs in the paper base material layer 23, and the delamination proceeds to the inside of the container. Since the strength of the sealant layer 24 is weak, it can be easily broken and opened.
When the container is opened, water vapor or the like 5 inside the container heated by a microwave oven or the like is vigorously ejected from the opened portion.

<Example 1>
For the tray, coated cardboard having a basis weight of 400 g / m ² is used as the paper substrate layer, and after printing on the coated surface side, a low density polyethylene resin of 45 μm is extruded on the front and back using an extruder lamination machine and laminated. A multi-layer sheet for trays was created.
From the multi-layer sheet for trays, the shape shown in FIG. 4-1 is punched out, bent along a ruled line, the triangular plates at the four corners are inscribed, bent outward and fused to the side plates, and the flanges at the four corners are fused to the flange. To create a tray having a rectangular opening, and a half-cut portion was processed at the flange end of the planned opening portion.
As the lid material, a coated cardboard having a basis weight of 310 g / m ² is used as the paper substrate layer, and after printing on the coated surface side, a 20 μm low-density polyethylene resin is extruded using an extruder lamination machine and laminated. A multi-layer sheet for materials was created.
From the above-mentioned multi-layer sheet for lid material, among the shapes shown in FIG. 4-2, the distance between the outer edge of the knob portion of L and the outer edge of the peripheral seal portion is punched out to a size of 10 mm, and at the same time, a bent ruled line is inserted at the base of the knob portion to cover the lid. The material was created.

<Example 2>
The same tray as in Example 1 was used.
As the lid material, the same multilayer sheet for lid material as in Example 1 was used. Of the shapes shown in FIG. 4-2, the distance between the outer edge of the pinched portion and the outer edge of the peripheral sealing portion of L was punched out to a size of 20 mm, and at the same time, a bent ruled line was inserted at the base of the pinched portion to prepare a lid material.

<Comparative example 1>
The same tray as in Example 1 was used.
As the lid material, the same multilayer sheet for lid material as in Example 1 was used. Of the shapes shown in FIG. 4-2, the distance between the outer edge of the pinched portion of L and the outer edge of the peripheral sealing portion was punched out to a size of 7 mm, and a lid material was prepared without bending a ruled line at the base of the pinched portion.

<Comparative example 2>
The same tray as in Example 1 was used.
As the lid material, the same multilayer sheet for lid material as in Example 1 was used. Of the shapes shown in FIG. 4-2, the distance between the outer edge of the pinched portion of L and the outer edge of the peripheral sealing portion was punched out to a size of 7 mm, and at the same time, a bent ruled line was inserted at the base of the pinched portion to prepare a lid material.

<Comparative example 3>
The same tray as in Example 1 was used.
As the lid material, the same multilayer sheet for lid material as in Example 1 was used. Of the shapes shown in FIG. 4-2, the distance between the outer edge of the pinched portion of L and the outer edge of the peripheral sealing portion was punched out to a size of 10 mm, and a lid material was prepared without bending a ruled line at the base of the pinched portion.

<Comparative example 4>
The same tray as in Example 1 was used.
As the lid material, the same multilayer sheet for lid material as in Example 1 was used. Of the shapes shown in FIG. 4-2, the distance between the outer edge of the pinched portion and the outer edge of the peripheral sealing portion of L was punched out to a size of 20 mm, and a lid material was prepared without bending a ruled line at the base of the pinched portion.

<Evaluation test method>
150 mL of tap water was put into the tray, and the lid material was fused to the flange of the tray to complete the paper container. The paper container was dielectrically heated at 600 W for 3 minutes in a microwave oven to boil the tap water inside.
Wear heat-resistant gloves, grasp the tip of the grip of the paper container lid with the thermoelectron pair of the thermometer, bend the grip perpendicular to the flange, raise it, pull it upward, open it, and water vapor leaks. The state where it started to appear was maintained, and the temperature sensed by the thermoelectron pair at that time was recorded.

<Evaluation test results>
When the distance between the outer edge of the knob portion and the outer edge of the peripheral seal portion of L was 7 mm, the temperature was 80 ° C. or higher regardless of whether or not there was a bent ruled line at the base of the knob portion.
When the distance between the outer edge of the knob of L and the outer edge of the peripheral seal is 10 mm or 20 mm, the temperature will be less than 65 ° C if there is a bent ruled line at the base of the knob, but if there is no bent ruled line, it will be grasped with bare hands at a high temperature of 70 ° C or higher. Was impossible.
Therefore, the distance between the outer edge of the knob portion and the outer edge of the peripheral seal portion needs to be 10 mm or more, and a bent ruled line at the base of the knob portion is also required.

The paper container of the present invention is as described above, and has a fold ruled line at the knob portion of the lid material, and when the lid material is peeled off from the tray, the fold line portion bends perpendicularly to the fusion surface, and the paper container is sufficiently bent. Since it is kept away from the place where it is opened, there is no risk that the high-temperature steam that blows out of the container will directly catch the gripping part.
Moreover, since the tray base material is provided with a cut parallel to the fold ruled line between the fold ruled line and the outer edge of the peripheral seal portion, the lid material is separated from the cut portion of the tray that triggers opening. Delaminates the paper layer of the tray and comes off the tray, making it easy to open.
In particular, the shape of the knob part of the lid material, the ruled line, the half-cut to the tray flange, etc. can be processed at the same time by punching the outer shape, so the merit of the present invention is that it can be handled without affecting productivity and price. large.

1 ・ ・ ・ ・ ・ ・ ・ ・ Paper container 2 ・ ・ ・ ・ ・ ・ ・ ・ Tray 21 ・ ・ ・ ・ ・ ・ ・ ・ ・ Peripheral seal part 211 ・ ・ ・ ・ ・ ・ ・・ Cut (cut of tray base material)
23 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・・ ・ ・ ・ ・ ・ Lid sealant layer 4 ・ ・ ・ ・ ・ ・ ・ ・ Opening starting point 41 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・

Claims (4)

In a paper container composed of a tray made of a multi-layer sheet made of paper as a base material and a lid material fused to the peripheral edge of the tray.
The lid material has a knob portion made of an unsealed portion on the outside of the peripheral sealed portion at the opening starting point.
The outer edge of the knob is separated from the outer edge of the peripheral seal portion by 10 mm or more to the outside.
In addition, a bent ruled line is provided between the knob and the outer edge of the peripheral seal.
A paper container characterized in that the tray is provided with a cut parallel to the folding ruled line between the folding ruled line and the outer edge of the peripheral edge seal portion. The paper container according to claim 1, wherein the paper container is for heating in a microwave oven. The paper container according to claim 2, wherein the cut is a half cut. The paper container according to any one of claims 1 to 3, wherein the bent ruled line is provided at the base of the knob portion perpendicular to the opening direction.

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