JP6421522B2 - Container for microwave oven - Google Patents

Description

  The present invention relates to a container for a microwave oven.

  The container for microwave ovens has a flange part extended outside from an opening as disclosed in, for example, Patent Document 1 below, and a rib-like heat fusion part is formed on the entire upper surface of the flange part. Has been. This heat-sealing part is a part for heat-sealing a film-like lid material that closes the opening of the container. A part of the heat fusion part is formed with a steam discharge part for so-called steam removal, and the steam discharge part is constituted by a V-shaped part having a pattern expanding outward. When the steam generated in the container reaches the predetermined pressure, the stress is concentrated at the sharp point inside the V-shaped part, and the heat fusion of the lid material is broken. It is supposed to let you.

  However, the steam discharge portion configured as described above is configured so that when the steam reaches a predetermined pressure, the heat seal width of the heat seal portion is controlled so that the heat seal of the lid member is surely broken. Although a method of setting the value to a predetermined value is also conceivable, it must be performed in a narrow space, and it is inevitable that it has a limit.

Japanese Patent No. 5050648

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

The present invention is grasped by the following composition.
(1) A container for a microwave oven of the present invention has a container body having an opening in the upper part, a flange part formed so as 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 part And a heat-sealing part that is heat-sealed to a film-like lid material that closes the opening, and the heat-sealing part is a lid material when the vapor generated in the container body reaches a predetermined pressure. And a steam discharge part that discharges steam by breaking the thermal fusion with the steam discharge part, and 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, characterized in that the tip located inside is inclined so as to become lower toward the opening.

(2) The container for a microwave oven according to the present invention is characterized in that, in the configuration of (1), the steam discharge portion has a narrower heat fusion width than the other heat fusion portions.

(3) In the microwave oven container according to the present invention, in the configuration of (1) or (2), the flange portion is inclined with its extended end facing downward, and the heat-sealing portion has its upper surface horizontal. It is formed.

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

(5) In the microwave oven container according to the present invention, in any one of the constitutions (1) to (4), the container main body has, on the side surface thereof, a step having a small diameter along the circumferential direction. The side surface on the more opening side is inclined outward from the vertical direction.

  According to such a microwave oven container, when the steam reaches a predetermined pressure, it can be controlled to reliably break the thermal fusion of the lid member.

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. (A) is sectional drawing in IIIa-IIIa of Fig.2 (a), (b) is sectional drawing of the principal part at the time of stacking a some container main body. (A) is a perspective view which shows a lid opening part and a vapor | steam discharge part, (b) is sectional drawing in the IVb-IVb line | wire of (a). It is sectional drawing in the VV line | wire of Fig.2 (a). It is a top view which shows the whole Embodiment 2 of the container for microwave ovens of this invention.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention (hereinafter referred to as embodiments) will be described in detail with reference to the accompanying drawings. Note that the same number is assigned to the same element throughout the description of the embodiment.

(Embodiment 1)
FIG. 1 is a perspective view showing the entire microwave oven container of the present invention. A 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 plan view, and has an opening 21 at the top. 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 is substantially rectangular in a plan view, and has a wide portion 22A that is wider at the corners than other portions.

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

  The lid member 50 is in the form of a film having an outer periphery that is substantially the same size as the outer periphery of the flange portion 22. After the contents (not shown) are stored in the container body 20, the lid member 50 is heat-sealed (sealed) to the heat-sealing portion 23, thereby closing the opening 21 of the container body 20. Yes. FIG. 1 shows a state in which the lid member 50 is partially peeled from one corner portion of the flange portion 22 after heating by the range.

  In addition, a heat fusion part 23 has an “M” -shaped pattern at one corner of the flange part 22 which is a starting point for peeling off the cover member 50. A lid opening portion 24 and a steam discharge portion 25 are formed in the portion 23. In this specification, the steam discharge portion 25 may be referred to as a first heat fusion portion, and the other heat fusion portion 23 may be referred to as a second heat fusion portion.

  FIG. 2A is a top view of the container body 20, and FIG. 2B is a side view of the container body 20. In addition, illustration of the cover material 50 is abbreviate | omitted in FIG. 1 (a), (b).

  As shown in FIG. 2 (a), in the 'M'-shaped pattern of the heat fusion portion 23, the steam discharge portion is formed by the central' V'-shaped pattern (V-shaped portion expanding outward). 25, and a lid opening portion 24 is formed by an inverted 'V'-shaped pattern (V-shaped portion that expands inward) on both sides. In this case, the right part of the steam discharge part 25 is made common with a part of the lid opening part 24 adjacent to the right side, and the left part of the steam discharge part 25 is common with a part of the cover opening part 24 adjacent to the left side. It is formed.

  When the lid member 50 is peeled off from the corner portion where the lid opening portion 24 of the flange portion 22 is formed, stress concentrates on the sharpened portion of the reverse 'V'-shaped pattern of the lid opening portion 24 and the lid member 50 is removed. There is an effect that can be easily peeled off. Further, when heating in the range, the vapor pressure generated in the container body 20 is concentrated when the stress is concentrated on the sharpened portion of the 'V'-shaped pattern of the vapor discharge portion 25 and the vapor pressure reaches a predetermined pressure. In addition, there is an effect that the thermal fusion with the lid member 50 is easily broken.

  Such a steam discharge part 25 is formed by making a part of the heat fusion part 23 into a 'V'-shaped pattern as described above, and has a narrower heat than the heat fusion part 23 other than this part. It has a fusion width t. By setting the steam discharge portion 25 to a narrow heat-sealing width t, the heat-sealing with the lid member 50 can be easily broken. Further, by widening the heat fusion width T of the heat fusion part 23 other than the steam discharge part 25, there is an effect that it is possible to prevent the vapor removal outside the steam discharge part 25.

  Fig.3 (a) is sectional drawing in IIIa-IIIa of Fig.2 (a). As shown in FIG. 3A, the flange portion 22 of the container main body 20 is formed to be inclined at an angle θ (for example, 6 °) with the extended end facing downward. Such an inclination of the flange portion 22 is substantially the same over the entire circumference of the flange portion 22. The container main body 20 is configured in advance in anticipation of warpage during molding. In this case, the heat fusion part 23 is formed so that the upper surface thereof is substantially horizontal, and the reliability of heat fusion with the lid member 50 (see FIG. 1) is ensured. For this reason, the heat fusion part 23 is formed so that the height t1 with respect to the flange part 22 on the inner peripheral side is smaller than the height t2 with respect to the flange part 22 on the outer peripheral side.

  FIG. 4A is a perspective view showing the lid opening part 24 and the steam discharge part 25 formed in the wide part 22 </ b> A of the flange part 22. FIG. 4B is a cross-sectional view taken along line IVb-IVb in FIG. As shown in FIGS. 4A and 4B, the steam discharge portion 25 is inclined so that the tip located inside the V-shaped portion becomes lower toward the opening in a side view. Here, as shown in FIG. 4B, the flange portion 22 is formed to be inclined at an angle θ (for example, 6 °) with its extended end facing downward, and the horizontal surface Q outside the steam discharge portion 25. The height t3 is lower than the height t4 with respect to the outer horizontal plane Q.

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

  Here, the preferable aspect in the case of making the vapor | steam discharge part 25 incline so that the front-end | tip located inside a V-shaped part becomes low toward the opening 21 is demonstrated. In FIG.4 (b), the height t7 from the flange part 22 of the edge part (left end in the figure) outer side of the vapor | steam discharge | emission part 25 ensures the thickness of the member which should be provided as a container for microwave ovens. From the relation, it is preferably 1 to 5 mm, more preferably 1 to 3 mm. About 1.2 mm is preferable on average.

  And about the front-end | tip (the right end in a figure) which is low toward the opening 21, height t6 of a right end outer edge (the left outer edge of a right end in a figure) is 40 to 90% of height t7 of a left end outer edge, The height t5 of the inner right edge (the right outer edge at the right end in the figure) is preferably lowered so as to correspond to 5 to 50% (average of about 30%). In this case, the height t5 is set to be lower than the height t6. By doing in this way, the front-end | tip of the V-shaped part of the vapor | steam discharge | emission part 25 is far from the opening 21 of the container main body 20, when the inner edge of the front-end | tip itself is lower than the outer edge at the same time as the edge part which expands. The vapor discharge part 25 can be changed from a relatively strong part to a weak part as it goes closer to the side.

  Returning to FIG. 2A, in the flange portion 22 where the lid opening portion 24 and the steam discharge portion 25 are formed, the heat fusion portion 23 (including a part of the lid opening portion 24) on both sides of the steam discharge portion 25. ), Two recesses 31 are formed. Further, two concave portions 32 are formed in the flange portion 22 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 fusion part 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 contents, whereby the steam of each lid opening part 24 is formed. The portion on the opposite side to the discharge portion 25 has a pattern that continues to the heat fusion portion 23 with a steep inclination, and a sufficient space is provided between the outer periphery of the flange portion 22 (wide portion 22A) outside the heat fusion portion 23. It can be ensured, 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 in FIG. 2A, such recesses 31 and 32 are relatively heat-sealed with respect to the bottom surfaces of the recesses 31 and 32. The height of the opening portion 24) can be increased, and the effect of preventing sticking to the flange portion 22 when sealing the lid member 50 (see FIG. 1) is achieved. In addition, it is conceivable to form a recess in a portion of the steam discharge portion 25 that is expanded toward the outside of the V-shaped portion. However, this portion is difficult to form in a very narrow region, and instead the recess 32 is formed. By forming it, the same effect can be produced.

  Further, returning to FIG. 3A, a step 27 is formed on the side surface of the container body 20 so that the lower portion has a small diameter along the circumferential direction. 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 figure). The step 27 on the side surface of the container body 20 is such 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. The upper container body 20 can be easily extracted from the lower container body 20 by tilting the side surface 28 on the opening 21 side from the step 27 to the outside of the vertical direction. Play.

(Embodiment 2)
In the embodiment described above, the microwave oven container 10 has a substantially rectangular shape in which the container body 20 has a rounded corner in a plan view, and the flange portion 22 has a substantially rectangular shape in a plan view. In this example, the portion having the wide portion 22A is given 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 each corner portion has a wide portion 22A. Of course it is good.

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

  As mentioned above, although this invention was demonstrated using embodiment, it cannot be overemphasized that the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above-described embodiments. Further, it is apparent from the description of the scope of claims that embodiments with such changes or improvements can also be included in the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 10 Container 20 for microwave ovens Container body 21 Opening 22 Flange part 22A Wide part 23 Thermal fusion part 24 Lid opening part 25 Steam discharge part (1st thermal fusion part)
27 Step 28 side surface (side surface on the opening 21 side from step 27)
31 Recess 32 Recess 50 Lid

Claims (5)

A container for a microwave oven,
A container body having an opening at the top;
A flange portion formed to extend outward from the opening of the container body;
A heat-sealed portion that is formed in a rib shape over the entire circumference of the upper surface of the flange portion, and is heat-sealed to a film-like lid member that closes the opening;
Steam discharge as a first heat-sealing part that breaks the heat-sealing with the lid 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 part has a V-shaped part that expands outward in a plan view, and inclines so that a tip located inside the V-shaped part becomes lower toward the opening in a side view. A container for a microwave oven.   The container for microwave oven according to claim 1, wherein the vapor discharge part has a heat fusion width narrower than that of the other heat fusion part. 3. The flange according to claim 1, wherein the flange portion is inclined with its extending end facing downward, and the second heat fusion portion is formed with its upper surface horizontal. Container for microwave oven. 4. The microwave oven according to claim 1, wherein the flange portion has concave portions on both sides of the steam discharge portion and outside the second heat-sealing portion. 5. container.   2. The container body according to claim 1, wherein a side surface of the container body has a step having a small diameter along a circumferential direction, and the side surface on the opening side of the step is inclined outward from the vertical direction. 5. The microwave oven container according to any one of 1 to 4.

Images