JP6687866B2 - Microwave container - Google Patents

Description

  The present invention relates to a microwave container.

  A microwave oven container has a flange portion extending outward from an opening, for example, as disclosed in Patent Document 1 below, and a rib-shaped heat-sealed portion is formed on the entire upper surface of the flange portion. Has been done. The heat-sealing portion is a portion for heat-sealing the film-shaped lid member that closes the opening of the container. A so-called steam discharge part for removing steam is formed in a part of the heat-sealed part, and the steam discharge part is constituted by a V-shaped part having a pattern expanding outward. In the steam discharge portion configured as described above, when the steam generated in the container reaches a predetermined pressure, stress concentrates on the sharp portion inside the V-shaped portion, and the thermal fusion of the lid material is broken. It is designed to let you.

  However, in the case where the steam discharge part configured in this way is controlled so as to surely break the heat seal of the lid material when the steam reaches a predetermined pressure, the heat seal width of the heat seal part Can be considered to be set to a predetermined value, but it has to be carried out in a narrow space, and there is an unavoidable limitation.

Japanese Patent No. 5050648

  The present invention has been made in view of such circumstances, and an object thereof is to provide a microwave oven container that can be controlled so as to reliably break thermal fusion of a lid material when steam reaches a predetermined pressure. To provide.

The present invention can be understood by the following configurations.
(1) A container for a microwave oven according to the present invention has a container body having an opening at the top, a flange portion formed to extend outward from the opening of the container body, and a rib shape over the entire circumference of the upper surface of the flange portion. And a heat-sealing portion that is heat-sealed to the film-shaped lid material that closes the opening, and the heat-welding portion is a lid material when the steam generated in the container body reaches a predetermined pressure. And a steam discharge part for discharging steam by breaking the heat fusion with the steam discharge part. The steam discharge part has a V-shaped part that expands outward in a plan view, and a V-shaped part in a side view. A container for a microwave oven, wherein a tip located inside of the container is inclined so as to be lowered toward the opening.

(2) The microwave oven container of the present invention is characterized in that, in the configuration of (1), the vapor discharge part has a heat fusion width narrower than the other heat fusion parts.

(3) In the microwave oven container of the present invention, in the configuration of (1) or (2), the flange portion inclines with its extending end facing downward, and the heat fusion portion makes its upper surface horizontal. It is characterized by being formed.

(4) In the microwave oven container of the present invention according to any one of the configurations (1) to (3), the flange portion has recesses on both sides of the steam discharge portion and outside the heat fusion portion. It is characterized by

(5) In the container for a microwave oven according to the present invention, in the structure according to any one of (1) to (4), the container body has a step on its side surface that has a small diameter downward along the circumferential direction. It is characterized in that the side surface closer to the opening is inclined outward from the vertical direction.

  According to such a microwave oven container, it becomes possible to reliably control the thermal fusion of the lid member when the vapor reaches a predetermined pressure.

It is a perspective view which shows the whole Embodiment 1 of the container for microwave ovens of this invention. (A) is a top view of a container main body, (b) is a side view of a container main body. 2A is a cross-sectional view taken along line IIIa-IIIa in FIG. 2A, and FIG. 2B is a cross-sectional view of a main part when a plurality of container bodies are stacked. (A) is a perspective view which shows a lid opening part and a vapor discharge part, (b) is sectional drawing in the IVb-IVb line of (a). It is sectional drawing in the VV line of FIG. It is a top view which shows the whole Embodiment 2 of the container for microwave ovens of this invention.

  Hereinafter, modes (hereinafter, embodiments) for carrying out the present invention will be described in detail with reference to the accompanying drawings. The same elements are denoted by the same numbers throughout the description of the embodiments.

(Embodiment 1)
FIG. 1 is a perspective view showing the entire microwave oven container of the present invention. The microwave oven container 10 shown in FIG. 1 includes a container body 20 and a lid member 50. Both the container body 20 and the lid member 50 are made of a resin material.

  The container body 20 has a substantially rectangular shape with rounded corners in a plan view, and has an opening 21 in the upper portion. Further, the container body 20 is formed with a flange portion 22 so as to extend outward from the opening 21. The flange portion 22 has a substantially rectangular shape in a plan view, and has a wide portion 22 </ b> A having a wider width than the other portion at a corner (corner) portion.

  The flange portion 22 is formed with a rib-shaped heat-sealing portion 23 that is convex on the upper surface side thereof. The heat-sealed portion 23 is formed over the entire circumference of the flange portion 22. In other words, the heat-sealing portion 23 is formed on the upper surface of the flange portion 22 so as to surround the opening 21 of the container body 20.

  The lid member 50 is formed of a film having an outer periphery having substantially the same size as the outer periphery of the flange portion 22. The lid member 50 closes the opening 21 of the container body 20 by heat-sealing (sealing) the heat-sealing portion 23 after storing the contents (not shown) in the container body 20. There is. It should be noted that FIG. 1 shows a state in which the lid member 50 is partly peeled from one corner (corner) of the flange portion 22 after being heated by the microwave oven.

  Further, at one corner (corner) of the flange portion 22 which is the starting point of the peeling of the lid member 50, the heat-sealing portion 23 has an'M'-shaped pattern. A lid opening portion 24 and a vapor discharging portion 25 are formed in the portion 23. In this specification, the vapor discharge part 25 may be referred to as a first heat fusion part, and the other heat fusion parts 23 may be referred to as a second heat fusion part.

  2A is a top view of the container body 20, and FIG. 2B is a side view of the container body 20. Note that the lid member 50 is not shown in FIGS. 1 (a) and 1 (b).

  As shown in FIG. 2 (a), in the'M'-shaped pattern of the heat-sealed portion 23, the vapor discharge part is formed by the central'V'-shaped pattern (V-shaped portion expanding outward). 25 is formed, and the lid opening portion 24 is formed by the inverted “V” -shaped patterns (V-shaped portions that widen inward) on both sides thereof. In this case, the right side portion of the steam discharge part 25 is shared with a part of the lid opening part 24 adjacent to the right side, and the left side part of the steam discharge part 25 is shared with a part of the lid opening part 24 adjacent to the left side. Are formed.

  When the lid material 50 is peeled from the corner (corner) of the flange portion 22 where the lid opening portion 24 is formed, stress is concentrated on the sharp portion of the inverted'V'-shaped pattern of the lid opening portion 24, and the lid material 50 is removed. Has the effect of being easily peeled off. Further, when heating in a microwave oven, when the vapor pressure generated in the container body 20 is concentrated on the sharp portion of the'V'-shaped pattern of the vapor discharge portion 25, the vapor pressure reaches a predetermined pressure. In addition, the effect of easily breaking the heat fusion with the lid member 50 is achieved.

  Such a vapor discharge part 25 is formed by forming a part of the heat fusion part 23 into a V-shaped pattern as described above, and is narrower than the heat fusion part 23 other than this part. It has a fusion width t. By setting the heat discharge width t to be narrow in the steam discharge part 25, it becomes possible to easily break the heat seal with the lid member 50. In addition, by widening the heat-sealing width T of the heat-sealing portion 23 other than the steam discharging portion 25, it is possible to prevent steam from being discharged from other than the steam discharging portion 25.

  FIG. 3A is a sectional view taken along line IIIa-IIIa in FIG. As shown in FIG. 3A, the flange portion 22 of the container body 20 is formed to be inclined at an angle θ (for example, 6 °) with its extending end facing downward. Such inclination of the flange portion 22 is substantially the same over the entire circumference of the flange portion 22. The container body 20 is configured in advance in consideration of warpage during molding. In this case, the heat-sealing portion 23 is formed such that the upper surface thereof is substantially horizontal to ensure the reliability of heat-sealing with the lid member 50 (see FIG. 1). Therefore, the heat-sealing portion 23 is formed so that the height t1 with respect to the inner peripheral flange portion 22 is smaller than the height t2 with respect to the outer peripheral flange portion 22.

  FIG. 4A is a perspective view showing the lid opening portion 24 and the vapor discharge portion 25 formed in the wide portion 22A of the flange portion 22. FIG. 4B is a sectional view taken along the line IVb-IVb in FIG. As shown in FIGS. 4A and 4B, the vapor discharge portion 25 is inclined so that the tip located inside the V-shaped portion is lowered toward the opening in a side view. Here, as shown in FIG. 4 (b), the flange portion 22 is formed so as to be inclined at an angle θ (for example, 6 °) with its extension end facing downward, and is formed on the horizontal plane Q outside the steam discharge portion 25. Is formed to be lower than the height t4 with respect to the outer horizontal plane Q.

  In this case, the upper surface of the heat-sealing portion 23 (including a part of the lid opening portion 24) other than the steam discharge portion 25 is formed to be horizontal, as in the case shown in FIG. In this way, by inclining the vapor discharge portion 25 so that the tip located inside the V-shaped portion becomes lower toward the opening 21, the sealing strength on the opening 21 side of the vapor discharge portion 25 can be weakened, The effect of facilitating steam removal will be obtained. Therefore, it becomes possible to control so that the heat fusion of the lid member 50 is reliably broken when the vapor reaches a predetermined pressure.

  Here, a preferable mode in which the vapor discharge portion 25 is inclined so that the tip located inside the V-shaped portion becomes lower toward the opening 21 will be described. In FIG. 4B, the height t7 from the flange portion 22 at the outer edge (the left end in the drawing) of the steam discharge portion 25 on the side where the steam discharge portion 25 expands ensures the thickness of the member to be provided as the microwave container. From the relationship, it is preferably 1 to 5 mm, more preferably 1 to 3 mm. On average, about 1.2 mm is preferable.

  Then, for the tip (right end in the figure) that is lowered toward the opening 21, the height t6 of the right end outer edge (the left outer edge of the right end in the figure) is 40 to 90% of the height t7 of the left end outer edge, It is preferable that the height t5 of the inner edge of the right end (outer edge on the right side of the right end in the figure) is also low so as to correspond to 5 to 50% (on average about 30%). In this case, the height t5 should be lower than the height t6. By doing so, the tip of the V-shaped portion of the steam discharge portion 25 is lower than the end portion that expands, and at the same time, the inner edge of the tip itself is lower than the outer edge thereof, so that it is far from the opening 21 of the container body 20. From the side to the closer side, the vapor discharge part 25 can be changed from the portion having relatively high seal strength to the portion having weak seal strength.

  Returning to FIG. 2A, in the flange portion 22 where the lid opening portion 24 and the vapor discharging portion 25 are formed, both sides of the vapor discharging portion 25 and the heat fusion portions 23 (including a part of the lid opening portion 24 are included. 2), two recesses 31 are formed inside. Further, the flange portion 22 is formed with two recesses 32 on both sides of the steam discharge portion 25 and outside the heat fusion portion 23 (including a part of the lid opening portion 24). The heat-sealing portion 23 formed so as to surround the opening 21 of the container body 20 is preferably formed in the vicinity of the opening 21 in order to prevent the intrusion of the contents, whereby the steam of each lid opening portion 24 is vaporized. The portion on the side opposite to the discharge portion 25 has a pattern that is continuous with the heat fusion portion 23 with a steep inclination, and a sufficient space is provided outside the heat fusion portion 23 with the outer periphery of the flange portion 22 (wide portion 22A). The space can be secured, and the recess 32 can be formed in this space.

  As shown in FIG. 5, which is a cross-sectional view taken along the line VV of FIG. 2A, the concave portions 31 and 32 are relatively heat-bonded portions 23 (covers) to the bottom surfaces of the concave portions 31 and 32. The height of the unsealing portion 24) can be increased, and it is possible to prevent the lid member 50 (see FIG. 1) from sticking to the flange portion 22 at the time of sealing. It is also conceivable to form a concave portion in the portion of the steam discharge portion 25 that expands toward the outside of the V-shaped portion, but this portion is difficult to form in an extremely narrow region, and instead the concave portion 32 is formed. By forming it, the same effect can be achieved.

  Further, returning to FIG. 3A, a step 27 is formed on the side surface of the container main body 20 along the circumferential direction thereof so that the lower part thereof has a small diameter. The side surface 28 on the opening 21 side of the step 27 is formed so as to be inclined outward from the vertical direction (indicated by a dotted line P in the drawing). Such a step 27 on the side surface of the container body 20 is that the upper container body 20 is deeply stored in the lower container body 20 when a plurality of container bodies 20 are stacked as shown in FIG. 3B. The side wall 28 on the opening 21 side of the step 27 is inclined outward from the vertical direction so that the upper container body 20 can be easily pulled out from the lower container body 20. Play.

(Embodiment 2)
In the above-described embodiment, in the microwave container 10, the container body 20 has a substantially rectangular shape having a rounded corner in a plan view, and the flange portion 22 has a substantially rectangular shape in a plan view. The portion having the wide portion 22A is cited as an example. However, it is not limited to this. For example, as shown in FIG. 6, the container body 20 has a substantially circular shape in a plan view, the flange portion 22 has a substantially square shape in a plan view, and has a wide portion 22A at each corner (corner). Of course, it is also good.

(Embodiment 3)
In the embodiment described above, the lid opening part 24 is formed in common on both sides of the vapor discharge part 25 so as to be partially common. However, it goes without saying that these may be formed separately. For example, of the four corners of the flange portion 22, the vapor discharge portion 25 is formed in at least one corner portion, and the lid opening portion 24 is formed in the other at least one corner portion. Of course, it may be formed.

  Although the present invention has been described above using the embodiments, it goes without saying that the technical scope of the present invention is not limited to the scope described in the above embodiments. It will be apparent to those skilled in the art that various modifications and improvements can be added to the above-described embodiment. It is also apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

10 Microwave Oven Container 20 Container Main Body 21 Opening 22 Flange 22A Wide Part 23 Thermal Fusion Part 24 Lid Opening Part 25 Steam Discharge Part (First Thermal Adhesion Part)
27 step 28 side surface (side surface closer to the opening 21 than the step 27)
31 recess 32 recess 50 lid material

Claims (4)

A container for a microwave oven,
A container body having an opening at the top,
A flange portion formed so as to extend outward from the opening of the container body,
The formed over the entire circumference of the upper surface of the flange portion, and a heat-sealing portion which is heat-sealed to the film-like lid member for closing the opening,
A steam discharge as a first heat-bonding section in which the heat-bonding section breaks the heat-bonding with the lid material and discharges the steam when the steam generated in the container body reaches a predetermined pressure. And a second heat fusion part other than the steam discharge part ,
The steam discharge portion is formed by the V-shaped portion diverging outwardly in a plan view, microwave container seal strength is weakened toward the distal end, located inside the V-shaped portion. The container for a microwave oven according to claim 1, wherein the vapor discharge part is formed to be narrower than the second heat fusion part. The container for a microwave oven according to claim 1 or 2 , wherein the flange portion has recesses on both sides of the vapor discharge portion and outside the second heat fusion portion. 4. The container body according to claim 1 , wherein a side surface of the container body has a step having a small diameter downward along a circumferential direction, and a side surface on the opening side of the step is inclined outward from a vertical direction. The container for microwave oven according to any one of 1.

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