JP6928230B2 - Microwave oven container - Google Patents

Description

According to the present invention, when a container filled with contents such as a liquid substance, a solid substance, or a mixture thereof, such as a retort pouch, is heated in a microwave oven, electrons that release water vapor or the like generated inside the container to the outside. Regarding the container for the microwave oven.

When a container filled with contents such as retort food is heated in a microwave oven, the pressure inside the container rises due to steam generated from the contents due to the heating, and the container may burst and the contents may scatter. There is.

For this reason, there is a container provided with a mechanism for avoiding an increase in pressure inside the container (Patent Document 1). In Patent Document 1, by making the heat seal strength at the steam discharge part lower than the heat seal strength at other parts, it is possible to prevent steam from being released at a place other than the steam discharge part.

Japanese Unexamined Patent Publication No. 2016-141414

However, since the heat seal strength tends to vary, depending on the heat seal conditions, the heat seal strength at the steam discharge part is not lower than the heat seal strength at other parts, and steam is removed except at the steam discharge part. There is a risk that it will end up.

The present invention has been made in view of such circumstances, and provides a container capable of suppressing vapor removal at areas other than the corners.

According to the present invention, a container for a microwave oven including a container body that is deformed due to an increase in internal pressure due to cooking in a microwave oven, the container body having an opening at an upper portion and a peripheral wall surrounding the opening. The peripheral wall is provided with a flange portion formed so as to extend outward from the peripheral wall, the peripheral wall is provided with at least one corner portion, and the peripheral wall is provided inside the container body at a position adjacent to the corner portion. A container is provided that is provided with a convex shape that overhangs towards it.

In the present invention, the peripheral wall of the container body is provided with a convex shape protruding toward the inside of the container body at a position adjacent to the corner portion. When the internal pressure of the container increases, the container body is deformed starting from the convex shape, and the force applied to the adhesive surface between the flange and the lid material is increased at the adjacent corners of the convex shape. As a result, the seal is selectively peeled off at the corners where steam is to be evacuated, so that it is possible to prevent steam from being evacuated at corners other than the corners.

Hereinafter, various embodiments of the present invention will be illustrated. The embodiments shown below can be combined with each other.
Preferably, a pair of the convex shapes are provided on the peripheral wall so as to sandwich the corner portion.
Preferably, the convex shape is formed by bending the peripheral wall toward the inside of the container body.
Preferably, when the overhang amount of the convex shape is P and the length of the convex shape in the circumferential direction is W, the W / P is 2 or more.
Preferably, the peripheral wall has a polygonal shape having three or more sides and three or more corners.
Preferably, the polygonal shape has the corners rounded.
Preferably, the convex shape is provided at a position closer to the corner than the center of the side of the polygon.
Preferably, it has a small convex shape smaller than the convex shape.
Preferably, the lid material is heat-sealed all around the flange portion.

It is a perspective view which shows the container 1 in the state which the lid material 3 is heat-sealed to the container body 2 of the 1st Embodiment of this invention. In the steam venting portion 10, the lid material 3 is peeled off from the container body 2. It is a perspective view which shows the state before the container body 2 and the lid material 3 are heat-sealed in the container 1 of FIG. It is a perspective view of the container body 2 of FIG. 2 seen from the bottom surface side. The container body 2 of FIG. 2 is shown, FIG. 4A is a front view, FIG. 4B is a plan view, and FIG. 4C is a right side view. It is a perspective view which looked at the container body 2 of the 2nd Embodiment of this invention from the upper surface side. FIG. 5 is a perspective view of the container body 2 of FIG. 5 as viewed from the bottom surface side. The container body 2 of FIG. 5 is shown, FIG. 7A is a front view, FIG. 7B is a plan view, and FIG. 7C is a right side view.

Hereinafter, embodiments of the present invention will be described. The various features shown in the embodiments shown below can be combined with each other. In addition, the invention is independently established for each feature.

1. 1. 1st Embodiment As shown in FIGS. 1 to 4, the microwave oven container 1 of the first embodiment of the present invention includes a container body 2 and a lid material 3. Both the container body 2 and the lid material 3 are made of a resin material.

The container body 2 has a substantially rectangular shape with rounded corners in a plan view, has an opening 9 at the upper part, a peripheral wall 5 surrounding the opening 9, and a flange portion formed so as to extend outward from the peripheral wall 5. 6 is provided. A bottom wall 4 is provided at the bottom of the container body 2. The flange portion 6 has a substantially rectangular shape in a plan view, and has a wide portion at a corner portion that is wider than the other portions.

The lid material 3 is made of a film having an outer circumference substantially the same size as the outer circumference of the flange portion 6. The lid material 3 closes the opening 9 of the container body 2 by heat-sealing the flange portion 6 after storing the contents (not shown) in the container body 2. Examples of the contents include foods containing water. The lid material 3 is heat-sealed on the entire circumference of the flange portion 6 by pressing the lid material 3 from the outside with a heated sealing plate having a pressing surface having a predetermined width for a certain period of time in a state where the lid material 3 is overlapped with the flange portion 6. NS. The lid material 3 may be heat-sealed on the entire flange portion 6, or may be heat-sealed on a part of the flange portion 6 in the width direction. The width of the heat seal can be changed by changing the width of the pressing surface of the seal plate.

In the present embodiment, the upper surface of the flange portion 6 is a flat surface, but a heat-sealed portion that is rib-shaped and projects upward on the upper surface side of the flange portion 6 may be provided. The heat seal portion can be formed so as to surround the opening 9 of the container body 2 on the upper surface of the flange portion 6. In this case, since the pressing force applied between the lid member 3 and the flange portion 6 in the heat-sealing portion is increased, the heat-sealing strength in the heat-sealing portion is increased.

The peripheral wall 5 has four sides 5a and four corners 5b. A corner portion 5b is provided between the pair of sides 5a, and the corner portion 5b is rounded. Each of the pair of sides 5a sandwiching the corner portion 5b serving as the steam vent portion 10 is provided with a convex shape 8 protruding toward the inside of the container body 2. Each convex shape 8 is provided at a position adjacent to the corner portion 5b. One of the pair of sides 5a is the long side 5al and the other is the short side 5as. In the long side 5al, the convex shape 8 is provided at a position closer to the corner portion 5b than the center of the long side 5al. On the other hand, in the short side 5as, the convex shape 8 is provided substantially in the center of the short side 5as.

When the peripheral wall 5 is provided with the convex shape 8, when the internal pressure of the container 1 increases with microwave cooking, the container body 2 is deformed starting from the convex shape 8 and the adjacent corners 5b of the convex shape 8 are formed. In, the force applied to the adhesive surface between the flange 6 and the lid material 3 is increased . As a result, since the selectively peel seal at the corner 5b as a vapor release section 10, the vapor vent is made in non-corner portion is suppressed. Therefore, in the present embodiment, it is not essential to provide the rib-shaped heat seal portion on the flange portion 6 as in Patent Document 1, and the upper surface of the flange portion 6 can be flattened. As a result, it is possible to suppress the occurrence of problems such as the occurrence of juice residue on the step of the rib. Further, in the configuration of Patent Document 1, if the sealing conditions are not strictly controlled, steam may be released in a part other than the steam discharging part. However, by applying the technique of the present embodiment, the degree of freedom in setting the sealing conditions is high. Is enhanced.

It is preferable that the heat seal strength at the corner portion 5b serving as the steam vent portion 10 is smaller than the heat seal strength at the other portions. In this case, it is more surely suppressed that the steam is evacuated except for the corner portion 5b.

The convex shape 8 is formed by bending the peripheral wall 5 toward the inside of the container body 2. That is, the convex shape 8 has an arch shape.

As shown in FIG. 4A, where P is the overhang amount of the convex shape 8 and W is the length in the circumferential direction of the convex shape 8, W / P is 2 or more, and W / P is, for example, 2 to 10 It is preferably 2 to 5, and specifically, for example, 2, 3, 4, 5, 6, 7, 8, 9, and 10, and is a range between any two of the numerical values exemplified here. It may be inside. When the W / P is in the above range, the effect of providing the convex shape 8 is particularly effectively exhibited.

In the long side 5al, where the length of the long side 5al is LL, the W / LL is preferably 0.1 to 0.8, more preferably 0.2 to 0.5, and specifically, for example, 0. .1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, which is within the range between any two of the numerical values exemplified here. May be good. When W / LL is in the above range, the effect of providing the convex shape 8 is particularly effectively exhibited.

In the short side 5as, where the length of the short side 5as is LS, the W / LS is preferably 0.1 to 0.8, more preferably 0.2 to 0.7, and specifically, for example, 0. .1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, which is within the range between any two of the numerical values exemplified here. May be good. When W / LS is in the above range, the effect of providing the convex shape 8 is particularly effectively exhibited.

The peripheral wall 5 is provided with a small convex shape 11 smaller than the convex shape 8. The small convex shape 11 is preferably smaller than the convex shape 8 in at least one of the overhang amount P and the length W in the circumferential direction, and is smaller than the convex shape 8 in both cases. By providing the small convex shape 11, it is possible to improve convenience such as alleviating deformation due to the weight of the contents when taking out the container 1 from the microwave oven.

Assuming that the overhang amount of the small convex shape 11 is P1 and the overhang amount of the convex shape 8 is P2, P1 / P2 is preferably 0.1 to 0.5, and specifically, for example, 0.1, 0.2, It is 0.3, 0.4, 0.5, and may be within the range between any two of the numerical values exemplified here.

Assuming that the circumferential length of the small convex shape 11 is W1 and the circumferential length of the convex shape 8 is W2, W1 / W2 is preferably 0.05 to 0.3, and specifically, for example, 0. It is 05, 0.1, 0.15, 0.2, 0.25, 0.3, and may be within the range between any two of the numerical values exemplified here.

A plurality of small convex shapes 11 can be provided on each side 5a. The small convex shape 11 is provided in a grid pattern. The small convex shape 11 is also provided at a portion where the convex shape 8 is provided. The small convex shape 11 is also provided on the bottom wall 4. The small convex shape 11 extends from one of the opposite long sides 5al of the peripheral wall 5 to the other through the bottom wall 4. On the long side 5al, the small convex shapes 11 are provided in parallel at five positions at equal intervals. The small convex shape 11 extends from one of the opposing short sides 5as of the peripheral wall 5 to the other through the bottom wall 4. On the short side 5as, the small convex shapes 11 are provided in parallel at three positions at equal intervals.

Assuming that the pitch at which the small convex shape 11 is provided is PT, the PT / W1 is preferably 2 to 10, more preferably 3 to 8, and specifically, for example, 2, 3, 4, 5, 6, 7, 8, 9 and 10, and may be within the range between any two of the numerical values exemplified here.

Next, the usage method and the action and effect of the microwave oven container 1 will be described. First, a container 1 in which the contents are stored in the container body 2 and the lid material 3 is heat-sealed is prepared. When the container 1 is placed in a microwave oven and heated, the internal pressure of the container 1 rises due to the water vapor in the contents becoming water vapor. When the internal pressure of the container 1 rises, the container body 2 is deformed starting from the convex shape 8 and the force applied to the adhesive surface between the flange 6 and the lid material 3 increases at the adjacent corners 5b of the convex shape 8. As a result, the seal is selectively peeled off at the corner portion 5b serving as the steam venting portion 10, and the steam in the container 1 is discharged from the peeled portion. For this reason, it is suppressed that steam is evacuated from other than the steam bleeding portion 10.

2. Second Embodiment The second embodiment of the present invention will be described with reference to FIGS. 5 to 7. The microwave oven container 1 of the present embodiment has the same function as the microwave oven container 1 of the first embodiment, but the number of convex shapes 8 is different from that of the first embodiment in the present embodiment. doing. Hereinafter, the differences will be mainly described.

In the first embodiment, one convex shape 8 is provided on each of the pair of sides 5a sandwiching the corner portion 5b serving as the steam venting portion 10, and the remaining side 5a is not provided with the convex shape 8. .. On the other hand, in the present embodiment, the convex shape 8 is provided on all the sides 5a, and the two convex shapes 8 are provided on each long side 5al.

In the present embodiment, since the convex shape 8 enhances the force applied to the adhesive surface between the flange 6 and the lid material 3 at all the corners 5b, the seal of the specific corner 5b is selectively peeled off to steam. In order to form the punching portion 10, it is preferable that the heat seal strength at the corner portion 5b serving as the steam venting portion 10 is lower than that at the other corner portions 5b.

3. 3. Others The present invention can also be implemented in the following aspects.
The peripheral wall 5 may have at least one corner portion 5b.
The peripheral wall 5 may have a polygonal shape having three or more sides and three or more corners. In this case, the corners are arranged between the adjacent sides.
-The corner portion 5b may not be rounded or may be chamfered.
-The convex shape 8 may be provided only at one location adjacent to the corner portion 5b.

(Example)
After accommodating white rice containing water in the container body 2 shown in FIG. 1, the lid material 3 was heat-sealed to the flange portion 6. The heat seal strength was made uniform over the entire circumference of the flange portion 6. The container 1 in this state was placed in a microwave oven and heated. When the test was performed on 10 samples, the seal was selectively peeled off at the corner portion 5b which is the steam vent portion 10 in all the samples.

(Comparison example)
When the same test as in the example was performed using the container body 2 having the same configuration as that of FIG. 1 except that the convex shape 8 was not provided, in 2 out of 10 samples, except for the corner portion 5b. The seal has peeled off.

1: Microwave oven container 2: Container body 3: Lid material 4: Bottom wall 5: Peripheral wall 5a: Side 5al: Long side 5as: Short side 5b: Corner part 6: Flange part 8: Convex shape 9: Opening 10: Steam Punched part 11: Small convex shape

Claims (5)

A microwave oven container equipped with a container body that deforms as the internal pressure rises due to microwave cooking.
The container body has an opening at the top, and includes a peripheral wall surrounding the opening and a flange portion formed so as to extend outward from the peripheral wall.
The peripheral wall comprises at least one corner and
The peripheral wall is provided with a convex shape protruding toward the inside of the container body at a position adjacent to the corner portion.
The convex shape is formed by bending the peripheral wall toward the inside of the container body.
Let P be the amount of protrusion of the convex shape.
Assuming that the length of the convex shape in the circumferential direction is W,
W / P is 2 or more,
The peripheral wall has a polygonal shape having three or more sides and three or more corners.
A pair of the convex shapes are provided on the peripheral wall so as to sandwich the corner portion.
A container in which at least one of the pair of convex shapes is provided at a position closer to the corner portion than the center of the side of the polygonal shape. The container according to claim 1, wherein the polygonal shape has rounded corners. The container according to claim 1 or 2 , which has a small convex shape smaller than the convex shape. The container according to any one of claims 1 to 3 , wherein the lid material is heat-sealed all around the flange portion. The container according to any one of claims 1 to 4, wherein the heat seal strength at the corner portion serving as the steam vent portion is smaller than the heat seal strength at the other portion.

Images