JP7202077B2 - packaging container - Google Patents

Description

TECHNICAL FIELD The present invention relates to a packaging container capable of forming a steam vent opening.

Among processed foods, there are many that are stored in packaging containers, sold at normal temperature or below at stores such as supermarkets and convenience stores, and are eaten after being cooked in a microwave oven.

When processed food is heated in a microwave while it is contained in a packaging container, the internal pressure of the packaging container rises due to the steam generated from the processed food, causing the lid of the packaging container to come off from the main body or the packaging container itself. may break, causing processed food to flow out or damage the microwave oven.

In order to solve the above problem, a packaging container intended for cooking in a microwave oven generally has a steam release opening for discharging steam to the outside of the container (for example, Patent Document 1 reference).
However, since the packaging container is in an open state due to the presence of the vapor release opening, there is a risk that foreign matter may be mixed in during transportation or sale at a store.

JP 2005-67716 A

In the present invention, foreign matter can be prevented from entering the processed food in the packaging container before heating, the opening for steam escape can be easily formed immediately before or during heating, and the steam generated from the food, etc. during heating can be packaged. An object of the present invention is to provide a packaging container that can be discharged to the outside of the packaging container.

In order to solve the above problems, the packaging container of the present invention has the following configuration.
(1) Consists of a container body and a lid that fits into the container body and closes the opening of the container body, and the lid is provided with a perforated portion and a non-perforated portion that are alternately continuous. , A packaging container in which an opening for steam escape is formed by breaking the breaking portion.
(2) The packaging container according to (1), in which a tear preventing portion is provided at an end point of the breaking portion.
(3) The packaging container according to (1) or (2), wherein the distance between the perforated portion of the lid and the adjacent perforated portion is 0.10 to 0.30 mm.
(4) The packaging container according to any one of (1) to (3), wherein the lid has a thickness of 0.2 to 0.3 mm.
(5) The packaging container according to any one of (2) to (4), wherein the tear preventing portion is formed by a half-cut line.
(6) The packaging container according to any one of (1) to (5), wherein the breaking portion is X-shaped, H-shaped, arc-shaped, or semi-circular end elongated.

According to the present invention, it is possible to prevent foreign matter from entering the food in the packaging container before the food is heated, and to easily form an opening for steam release immediately before or during heating. In addition, a packaging container can be obtained in which steam generated from food or the like during heating can be discharged to the outside of the packaging container.

BRIEF DESCRIPTION OF THE DRAWINGS The perspective view showing the outline|summary of 1st embodiment of this invention. A plan view of an enlarged fractured portion of FIG. A plan view of a fracture portion of the present invention The perspective view showing the outline of other embodiments of the present invention. A plan view of an enlarged vapor release opening of a comparative example

Embodiments of the present invention are described below. However, embodiments of the present invention are not limited to the following embodiments.

(Basic configuration of container)
As shown in FIG. 1, the packaging container according to the present invention comprises a container body 100 and a lid 200 that is fitted into the container body 100 and closes the opening of the container body. The lid 200 is provided with a perforation-like breaking portion 310 to form a steam release opening 311 for discharging steam generated from the content during heating. Further, the container main body 100 and the lid 200 may be separate bodies, integrally molded, or connected using a connecting means.

(Position and number of broken parts)
Although the breaking portion 310 is provided in the center of the top surface 201 of the lid 200 in FIG. may be set to Moreover, as shown in FIG. 4A, two or more breaking portions 310 may be provided, or different shapes may be combined as shown in FIG. 4B.

(Break part and opening for steam escape)
Immediately before cooking, the breaking part 310 is pushed toward the inside of the container or pulled up toward the outside of the container, or is opened by the steam pressure generated inside the container during cooking, and becomes a steam release opening 311. . In FIG. 1(B), immediately before cooking, a steam release opening 311 is formed by pushing a push-in portion 315 inside the perforation-like breaking portion 310 in FIG. This is an example of

(Structure of broken part, etc.)
As shown in FIG. 2, the breaking portion 310 is configured in a perforation shape in which perforated portions 312 and non-perforated portions 313 are alternately continuous. Any number of perforations 312 may form the break 310 shown in FIG. Its size and shape are not limited as long as it does not contain foreign matter, but an elliptical shape with a short axis of 0.70 mm or less is preferable, and an elliptical shape with a short axis of 0.60 mm or less is more preferable. If it exceeds 0.70 mm, there is a risk that insects and foreign matter will pass through the perforations and enter the interior of the packaging container. Here, the ellipse is a shape consisting of points where the sum of the distances from two fixed points is constant, but in the present invention, the shape is not strictly limited to the shape defined as the ellipse. It may have a substantially elliptical shape surrounded by a series of bulging curves.
Also, the perforated portion 312 may be a hole with a diameter of 0.70 mm or less, or may be a combination of holes of different sizes and shapes. The distance between the perforated portion and the adjacent perforated portion is preferably 0.1 to 0.25 mm. Below 0.1 mm, the perforations may be productively connected to the adjacent perforations, and above 0.25 mm, excessive force is required to form the vapor vent openings. As a result, the lid 200 may be deformed or damaged.

The shape of the breaking portion 310 is, for example, the X-shaped breaking portion 310a in FIG. 3(A), the H-shaped breaking portion in FIG. Breaking portion 310b, spiral breaking portion 310c in FIG. 3(C), parallel linear breaking portion 310d in FIG. 3(D), arrow-shaped breaking portion 310e in FIG. 3(E), circle in FIG. 3(F) An arc breaking portion 310f, a circular breaking portion 310g in (G) of FIG. 3, and the like are included.
The shape of the breaking portion 310 depends on various factors such as the position of the breaking portion, the type of food to be heated, the method of breaking the breaking portion 310, the design of the breaking portion 310 itself, and the shape of the packaging container itself. The shape may be determined by comprehensively considering the shape, and the shape is not limited to these, but the semi-circular elongated shape is preferable because it is easy to break.

(Shape of hole)
The perforated portion 312 may be formed by, but not limited to, a method such as perforation using a laser, perforation by sticking a needle, cutting using a blade, or melting by heat processing. Among these, perforation using a laser is preferable because the hole shape and perforation position can be easily set and burrs are not generated.

(Drilling method)
Laser methods include various lasers such as carbon dioxide lasers, YAG lasers, semiconductor lasers, and argon lasers. Among these, it is preferable to use a carbon dioxide laser with a wavelength range of 9 to 11 μm. Although the irradiation output of the carbon dioxide laser is not particularly limited, it is preferably 10 to 100W. By adjusting the irradiation output of the carbon dioxide laser within this range, it is possible to efficiently perforate a hole with a desired diameter in the lid.

In addition, as for the transport speed of the laser, perforations can be formed smoothly if the irradiation light beam is moved at a transport speed of 5 to 30000 mm/s on the resin surface. By adjusting the moving speed of the laser beam within this range, it is possible to efficiently perforate a hole with a desired diameter in the lid.

(Rip prevention part)
The end points 314 of the fracture 310 may be provided with tear arresters 400 formed by half-cut lines, as shown in FIG. The tear prevention portion 400 is for preventing unnecessary tearing along the extension line of the fracture portion 310 when the fracture portion 310 is fractured. The tear prevention part 400 may be a through line instead of a half-cut line, and its size, shape and installation angle with respect to the fracture part are not particularly limited. Here, the half-cut line refers to a groove with a cut depth shallower than the thickness of the lid and body.

(Lid material)
The lid 200 of the container of the present invention is formed by molding a synthetic resin sheet containing polystyrene as a main component, from the viewpoint that the material is well-balanced in terms of strength, transparency, heat resistance, workability, economy, etc. things are preferred. Here, the main component means containing 50% by mass or more. The synthetic resin may be a copolymer of styrene and at least one monomer selected from (meth)acrylonitrile, (meth)acrylic acid ester, and (meth)acrylic acid. In particular, stretched sheets are suitable for container lids because of their high rigidity. is better to use When using a stretched synthetic resin sheet, setting the thickness to 0.1 to 1.0 mm makes it easier to form the vapor release opening 311 and prevents the broken portion 310 from opening unnecessarily. preferable. In particular, a sheet of 0.2 to 0.5 mm is more preferable from the viewpoint of strength and economy.

(Molding method of the lid)
As a molding method of the lid 200, hot plate molding and vacuum pressure molding are generally used, but injection molding and the like may be used, and the method is not limited to these.

(How to heat and cook)
As a method for cooking food in a container, a method using a microwave oven is generally used, but a hot water bath, steam heating, or the like may be used, and the method is not limited to these.

EXAMPLES Specific embodiments of the present invention will be described in more detail below by showing Examples and Comparative Examples, but the present invention is not limited only to these Examples.
<Example 1>

In order to confirm the limit of breakage of the container due to the force applied to the push-in portion 315 when forming the vapor release opening 311, a sheet having a thickness of 0.5 mm, which is the thinnest among sheets generally used as lid materials, was used. A 20 mm one was used to create the lid 200 . Specifically, a biaxially oriented polystyrene sheet (Denka Thermosheet High Heat Resistant BOPS (R roll)) is heat-plate molded to obtain a lid 200, and a semi-circular end elongation type shown in FIG. A fracture portion 310A was formed. The semi-circle end extension type breaking portion 310A has a shape in which straight lines of 17.5 mm are provided in the tangential direction from both ends of a semicircle with a diameter of 15 mm. was provided with a tear preventing portion 400 consisting of a half-cut line with a length of 10 mm perpendicularly intersecting the semi-circular end extension type breaking portion 310A at the midpoint. In addition, the semi-circular elongated breaking portion 310A was formed by punching a perforated portion 312 consisting of an elliptical hole having a major diameter of 1 mm and a minor diameter of 0.5 mm using a carbon dioxide laser. Table 1 shows the results of the following evaluations performed with the distance between adjacent perforations set to 0.20 mm.

<Examples 2 to 3 , Comparative Examples 1 and 2 >
Using a sheet with a thickness of 0.20 mm, a lid similar to that of Example 1 was formed, and perforations 312 were formed, and Example 2 was obtained by setting the distance between adjacent perforations to 0.10 mm. A sheet having a thickness of 0.25 mm was used to form a lid similar to that of Example 1, and perforations 312 were formed. A sheet having a thickness of 0.20 mm was used to form a lid similar to that of Example 1, and perforations 312 were formed. A sheet having a thickness of 0.20 mm was used to form a lid similar to that of Example 1, and a U-shaped cut with continuous perforations 312 as shown in FIG. 1.
Similar to Example 1, evaluation results of Examples 2 and 3 and Comparative Examples 1 and 2 are shown in Table 1.

[evaluation]
The lids obtained in Examples and Comparative Examples were evaluated as follows.

<Breaking test>
In the breaking test, when the pushing part 315 was pressed with a finger, the perforated breaking part 310 was easily broken and the steam release opening 311 was formed. When the lid could not be formed and the lid was deformed or damaged, it was evaluated as Δ.
<Insect Penetration Test>
The insect invasion test used Drosophila melanogaster, the smallest insect inhabiting Japan that can invade food containers. A container having a shape shown in FIG. 1 and having a lid fitted to a container body was used. Natto (fermented soybeans), which is said to emit an odor favored by fruit flies, was placed in the main body of the container as an inducer. In a room maintained at 25° C., 100 Drosophila were left in a sealed resin desiccator made by AS ONE. After 24 hours, the presence or absence of invasion of Drosophila into the container was evaluated. When one or more animals invaded, it was evaluated as present.

[Discussion]
Based on the above evaluation, the following considerations were made.

<Ease of breaking>
It was confirmed that the lid of the present invention has a perforation-like breaking portion in which the perforated portion and the non-perforating portion are alternately continuous, so that the broken portion can be easily broken to form an opening for steam release. At that time, if the thickness of the lid material is 0.2 mm or more, as shown in Examples 1 and 2, by setting the distance between adjacent perforated parts to 0.20 mm or less, the broken part can be removed without damaging the lid. It was confirmed that it can be easily broken. Further, it was confirmed that if the thickness of the lid material is increased, even if the distance between adjacent perforated portions is 0.20 mm or more, the broken portion can be easily broken without damaging the lid, as shown in Example 3. . On the other hand, in Comparative Example 2 , although the lid member had a thickness of 0.2 mm or more, the distance between the adjacent perforated portions exceeded 0.25 mm, so the broken portion was not easily broken.
<Insect invasion>
It was confirmed that the lids of Examples 1 to 3 and Comparative Example 2 did not allow insects to enter. On the other hand, in the steam release opening formed by the U-shaped cut of Comparative Example 1 as shown in FIG.

100 Container body 200 Lid 201 Top surface 310 Breaking part 310A Semicircular end extension breaking part 311 Steam release opening 312 Perforated part 313 Non-perforated part 314 End point 315 Pushing part 400 Rupture prevention part

Claims (6)

The lid is composed of a container body and a lid that closes the opening of the container body by being fitted to the container body, and the lid is provided with a perforated portion and a non-perforated portion that are alternately continuous to form a perforated breaking portion. By breaking the part, an opening for steam escape is formed,
The distance between the perforated portion of the lid and the adjacent perforated portion is 0.10 to 0.25 mm,
The lid has a thickness of 0.1 to 1.0 mm ,
The perforated portion is an ellipse or a substantially elliptical shape surrounded by a continuous curved line bulging outward, and the minor axis of the ellipse or the substantially elliptical shape is 0.70 mm or less . 2. The packaging container according to claim 1, wherein a tear preventing portion is provided at an end point of said breaking portion. The breaking part has a semi-circular end extension shape,
Both end points of the breaking portion are provided with the tear preventing portion,
3. The packaging container according to claim 2, wherein the tear-preventing portion has a straight line shape that intersects the end points of the breaking portion on the way. 4. The packaging container according to claim 3, wherein a portion of said tear arrester is formed between both said end points of said breaking portion. The packaging container according to any one of claims 2 to 4, wherein the tear preventing portion is formed by a half-cut line. The packaging container according to claim 1 or 2, wherein the breaking portion is X-shaped, H-shaped, arc-shaped or semi-circular elongated.

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