JP7210690B1 - Microwave container lid and microwave container - Google Patents

Abstract

[PROBLEMS] To provide a lid for a container for a microwave oven, which is resistant to deformation due to an external force, satisfactorily prevents contamination of foreign matter such as insects, and facilitates obtaining an appropriate amount of steam discharge according to the steam pressure during cooking. 2, and a container using the same. A microwave oven container lid (2) to be fitted inside a container body (1), wherein a top surface portion (20) is provided with an inverted dome-shaped concave surface portion (30) that bulges downward. , a laser slot 32 with a width of 0.3 mm to 1 mm for discharging vapor is provided. [Selection drawing] Fig. 1

Description

TECHNICAL FIELD The present invention relates to a microwave oven-compatible container and its lid, in which food contained therein can be heated in a microwave oven with the lid closed.

In a packaging container in which the lid fits inside the container body, when the contents such as food contained in the container are heated in a microwave oven, steam is generated when the contents are heated. It is necessary to eject. As a method for discharging the water vapor to the outside of the container, there is a method of perforating a ventilation hole or forming a ventilation path in the container. Here, if the generated water vapor cannot be properly discharged, the pressure inside the container increases, which may cause problems such as detachment of the lid from the container body.

On the other hand, before heating in a microwave oven and after heating, it is necessary to prevent foreign matter such as dust and insects from entering, and foreign matter from being mischievously mixed in at the store. A container without contamination is required.

In Patent Document 1 below, a recess is provided in the top surface of the lid, a dome shape is provided in the recess with the top at the top, and a notch is formed along the outer periphery of the dome shape, A C-shaped valve is provided in the dome shape. However, since the valve as a whole has a dome shape with a convex upper side, it cannot be said that it has a sufficient level of resistance to external forces, for example, from above, although it has a certain degree of resistance. Also, the valves are notched and steam discharge is achieved only by opening the valves. In addition, since a notch is formed on the outer periphery of the dome over a range of 3/4 or more of the entire circumference, the valve is easily rotated upward and opened as the internal steam pressure rises. A large amount of steam is discharged, and when the valve is closed, no steam is discharged. This creates a situation similar to that of an ON/OFF valve, making it difficult to precisely control the amount of discharged steam and, in turn, to keep the pressure inside the container within a certain range. It was something.

In addition, in Patent Document 2 below, a virtual circle is assumed in the portion of the lid top surface that bulges due to steam pressure, and along the circumference of the virtual circle, a plurality of degassing holes are arranged so as to form an arc. ing. However, the deformation of the top surface of the lid due to the steam pressure during heating and the restoring force of the arc-shaped valve are used to open the valve and discharge the steam. Since the opening area is determined by, there is a problem that it is difficult to control the amount of steam discharge. Furthermore, since the degree of swelling of the lid increases on the upper part of the food with a lot of moisture, and the shape of the ribs provided around the top surface of the lid also causes a difference in the degree of swelling, the degree of swelling due to heating is controlled. This is extremely difficult, and there is a possibility that the opening may not open at all depending on how the virtual circle is drawn.

Utility Model Registration No. 3203611 Japanese Patent No. 6612534

INDUSTRIAL APPLICABILITY The present invention provides a container for microwave ovens that is resistant to deformation due to external force, can satisfactorily prevent contamination by foreign matter such as insects, and facilitates obtaining an appropriate amount of steam discharge according to the steam pressure during cooking. An object of the present invention is to provide a lid and a container using the lid.

A microwave container lid according to the present invention is a microwave container lid that fits inside a container body, wherein the top surface portion is provided with an inverted dome-shaped concave portion that bulges downward, A laser long hole with a width of 0.3 mm to 1 mm is provided in the concave portion for discharging vapor.

According to this configuration, an inverted dome-shaped concave portion is provided on the top surface portion, and a laser long hole having a width of 0.3 mm to 1 mm is provided on the curved surface of the concave surface portion. Since the concave portion bulges toward the inside of the container and has an inverted dome shape, it is difficult to deform due to external force. Therefore, it is possible to easily prevent foreign matter from entering the inside of the container. On the other hand, during cooking with a microwave oven, the pressure inside the container rises due to the generated steam. It can be discharged smoothly from the long hole to the outside of the container, preventing an excessive pressure increase inside the container. Dome shape can be maintained. Therefore, even if the pressure inside the container rises during cooking, steam can be stably discharged from the long laser holes while the shape of the concave portion (inverted dome shape) is maintained. The width of the laser long hole is 0.3 to 1 mm as described above, but it is particularly 0.3 to 0.8 mm, further 0.3 mm to 0.7 mm, which effectively prevents insects such as flies from entering. It is preferable from the point that steam can be effectively discharged while preventing this.

In particular, it is preferable that the laser elongated hole is curved in an arc shape in plan view. As described above, since the concave portion has an inverted dome shape, it is difficult to deform due to the pressure inside the container. Therefore, the laser long hole does not open more than necessary due to the increase in pressure inside the container, and functions like a valve according to the pressure inside the container to slightly expand the opening area. Therefore, even if the amount of steam discharged inside the container increases, the rapid rise in pressure inside the container is suppressed by the simulated valve mechanism of the laser long hole, and the lid is prevented from coming off the container body. be done.

Further, the concave portion is preferably provided near the center of the lid, but the apex of the concave portion may be provided slightly eccentric to the top, bottom, left, and right from the center of the lid. In this case, when the laser long hole has two curved shapes as shown in FIG. 4, the concave portion is provided eccentrically in the first direction (direction indicated by Y1 in plan view in FIG. 4: Y1 direction). It is preferable that the laser long hole is provided eccentrically in the second direction (direction indicated by Y2 in plan view in FIG. 4: Y2 direction) with respect to the center of the concave portion. In this way, the concave surface and the laser long hole with respect to the concave surface are provided eccentrically in opposite directions, so that the laser long hole can be brought closer to the center of the lid. For example, when a closed container containing a liquid such as soup is tilted downward in the Y1 direction, the liquid easily reaches the concave surface, but the laser long hole in the concave surface is eccentric in the Y2 direction. Therefore, it is possible to suppress the liquid from leaking out from the laser slots.

In addition, it is preferable that the top surface portion is provided with an upwardly protruding ridge surrounding the concave portion, and that the ridge has a notch at one or more locations. According to this configuration, the portion of the top surface portion in the vicinity of the concave surface portion is less likely to be deformed by an external force. Also, even if the pressure inside the container rises during heating with a microwave oven, the portion of the top surface near the concave surface is less likely to deform. In addition, since the ridge has a notch, when the entire container is covered with a film, steam can be discharged to the outside of the ridge from the notch. Therefore, with this configuration, the control of the vapor discharge amount by the laser slot becomes more reliable and accurate.

A microwave container according to the present invention includes a container body and the lid described above.

As described above, the top surface is provided with an inverted dome-shaped concave surface, and the concave surface is provided with a laser long hole with a width of 0.3 mm to 1 mm. In addition, the deformation of the concave portion is small during cooking, and the inverted dome shape is maintained, and an appropriate amount of steam according to the steam pressure is released from the laser slot. can be discharged.

BRIEF DESCRIPTION OF THE DRAWINGS The perspective view which shows the lid open state of the container for microwave ovens in one Embodiment of this invention. FIG. 2 is a cross-sectional view of the main part showing the lid of the container in an open state; Fig. 3 is a cross-sectional view of a main part showing a closed state of the container; The top view of the lid|cover of the same container. (a) and (b) are enlarged views of essential parts of FIG. (a) is a sectional view taken along line AA in FIG. 5(a), and (b) is a sectional view taken along line BB in FIG. 5(a). The partial enlarged plan view of the lid|cover of the container for microwave ovens in other embodiment of this invention. (a) is a CC sectional view of FIG. 7, and (b) is a DD sectional view of FIG. The partial enlarged plan view of the lid|cover of the container for microwave ovens in other embodiment of this invention. The partial enlarged plan view of the lid|cover of the container for microwave ovens in other embodiment of this invention. The partial enlarged plan view of the lid|cover of the container for microwave ovens in other embodiment of this invention. The partial enlarged plan view of the lid|cover of the container for microwave ovens in other embodiment of this invention. The partial enlarged plan view of the lid|cover of the container for microwave ovens in other embodiment of this invention. The partial enlarged plan view of the lid|cover of the container for microwave ovens in other embodiment of this invention. The partial enlarged plan view of the lid|cover of the container for microwave ovens in other embodiment of this invention. The partial enlarged plan view of the lid|cover of the container for microwave ovens in other embodiment of this invention. (a) is a cross-sectional view along EE in FIG. 16, and (b) is a cross-sectional view along FF in FIG. GG end view of FIG. FIG. 4 is a cross-sectional view of a main part showing a closed state of a microwave container according to another embodiment of the present invention.

Hereinafter, a microwave container and its lid according to an embodiment of the present invention will be described with reference to FIGS. 1 to 6 and 16 to 18. FIG. The container in the present embodiment is for storing various foods, and is a microwave oven-compatible container that can be heated in a microwave oven with the lid closed without being unsealed. Foods include, for example, cooked soup and oven noodles.

As shown in FIG. 1, the container comprises a container body 1 and a lid 2. As shown in FIG. Both the container body 1 and the lid 2 are formed from synthetic resin sheets by various thermoforming (sheet forming) methods such as vacuum forming and pressure forming. The shape of the container in a plan view is arbitrary, and may be round, oval, substantially square, substantially polygonal, etc., but a round shape is preferable. The container body 1 has an opening that opens upward. The lid 2 is fitted inside the container body 1 to close the opening of the container body 1 . In the container body 1, jelly-like soup, noodles, scallions, etc. can be stored in advance so that they can be eaten by being heated as they are in a microwave oven. By fitting the lid 2 inside the container body 1, the sealing property can be improved so that the contained soup or the like does not leak when the lid is closed. In addition, the inner fitting structure and the outer fitting structure may be provided together. Moreover, an inner plate (not shown) may be accommodated between the container body 1 and the lid 2 as necessary.

The container body 1 and the lid 2 (or the inner plate if necessary) are made of a synthetic resin such as polyethylene terephthalate, polystyrene, or polyolefin such as polypropylene or polyethylene, which is heat-resistant and can be used in a microwave oven. can be used. As these sheet materials, a sheet obtained by dispersing an inorganic substance in the synthetic resin described above, a foamed sheet obtained by foaming the synthetic resin described above, or a stretched sheet obtained by stretching the above-described sheet can be used. Among these, heat-resistant foamed styrene resin sheets using heat-resistant styrene-based resin with excellent heat resistance as polystyrene, sheets made by expanding inorganic substances dispersed in polypropylene with excellent heat resistance, polyethylene terephthalate, A heat-resistant sheet obtained by stretching a sheet of polypropylene, polyethylene, or the like to improve heat resistance can be used and thermoformed. In particular, among these sheets, when a sheet with excellent transparency is used for the lid 2, it is preferable because the food contained therein can be visually recognized. Alternatively, a biaxially stretched stretched sheet is particularly preferable because it also has heat resistance necessary for heating in a microwave oven. The container body 1 is preferably obtained by thermoforming a sheet using a heat-resistant resin material. Since the container body 1 is heated in a microwave oven for use, it is particularly preferable to use a foamed heat-resistant resin material. A heat-resistant foamed styrene resin sheet is preferable because it can suppress electromagnetic waves from a microwave oven, efficiently transmit electromagnetic waves to food stored therein, heat the food uniformly and in a short period of time, and has excellent heat retention. .

<Container body 1>
As shown in FIGS. 1 to 3, the container body 1 includes a bottom surface portion 10, a main body side surface portion 11 extending upward from the outer edge of the bottom surface portion 10 while expanding, and an upper end of the main body side surface portion 11 extending outward. and a body flange portion 12 extending toward. The bottom portion 10 may be provided with legs (not shown) of various shapes. It is preferable that a main body fitting portion 13 into which a lid fitting portion 23 of the lid 2 is fitted is formed on the upper portion of the main body side portion 11 . The body fitting portion 13 is preferably provided over the entire circumference.

The body fitting portion 13 may have various shapes. The main body fitting portion 13 may have, for example, a reverse tapered shape that gradually decreases in diameter toward the upper side, or may have a vertical shape (straight shape) or a forward tapered shape with a fitting recess recessed outward. It may be a configuration provided. In this embodiment, the main body fitting portion 13 is configured to have a fitting concave portion recessed outward. Although the cross-sectional shape of the fitting recess may be various, it is preferably curved outward and has an arcuate cross-sectional shape or a trapezoidal cross-sectional shape.

As an example, the main body fitting portion 13 is provided at the upper end portion of the main body side portion 11 . The body fitting portion 13 includes a body fitting main portion 13a extending substantially vertically (perpendicularly or in a slightly reverse tapered shape or a slightly forward tapered shape) along the vertical direction, a body fitting concave portion 13b recessed outward, have. Most of the main body fitting main portion 13a is located above the main body fitting concave portion 13b. That is, the main body fitting concave portion 13 b is positioned at the lower portion of the main body fitting portion 13 , and the main body fitting main portion 13 a is positioned at the upper portion of the main body fitting portion 13 . It is preferable that the vertical length of the main body fitting main portion 13a is longer than the vertical length of the main body fitting concave portion 13b. It is preferable that the main body fitting recess 13b be provided over the entire circumference. A step portion 14 is preferably provided below the body fitting portion 13 . The step portion 14 is inclined upward toward the outside or extends substantially horizontally. A body fitting portion 13 extends upward from the outer edge of the step portion 14 .

The body flange portion 12 extends outward from the body fitting portion 13 . The body flange portion 12 has a beaded portion 15 that connects with the body fitting portion 13 . The beaded portion 15 curves upward in a cross-sectional view. The body flange portion 12 may be provided with a knob portion (not shown) for facilitating the lid opening operation.

It is preferable to form a main body edging portion 16 extending outward, for example horizontally or slightly downward, on the outer edge of the main body flange portion 12 . It is preferable to form a large number of fine irregularities in the outer region of the entire width of the main body edging portion 16 in the inward and outward directions, so that a reinforcing effect can be obtained and a finger cut can be prevented. The unevenness has a wavy shape when viewed from the front in an enlarged manner, and the direction in which the numerous peaks and valleys extend is the width direction (inner and outer directions). Further, the unevenness may be formed by, for example, flat knurling or twilled knurling, and it is particularly preferable to form by twilled knurling in order to prevent slippage.

<Lid 2>
The lid 2 is preferably transparent so that the food contained in the container can be visually recognized from the outside through the lid 2 . As shown in FIGS. 1 to 3, the lid 2 includes a top surface portion 20, a lid side surface portion 21 extending downward from the outer edge of the top surface portion 20, and a bottom end of the lid side surface portion 21 extending substantially outward. A lid extension portion 22 extending horizontally, a lid fitting portion 23 extending upward from the outer edge of the lid extension portion 22, and an upper end of the lid fitting portion 23 extending outward. and a lid flange portion 24 which is formed.

It is preferable to form a stacking protrusion 25 on the peripheral edge of the top surface 20 to prevent the containers from being displaced when the containers with the lids closed are stacked one on top of the other. The stacking protrusion 25 protrudes upward. The stacking convex portion 25 may extend along the peripheral portion of the top surface portion 20 . A pair of stacking protrusions 25 may be formed. The pair of stacking protrusions 25 may be symmetrical to each other, and may be formed at positions facing each other 180 degrees.

As shown in FIGS. 1 and 4, the direction in which the pair of stacking protrusions 25 face each other in plan view is the X direction, and the direction perpendicular to the X direction in plan view is the Y direction. Two regions in which the stacking projections 25 are not formed are provided at two locations in the Y direction of the peripheral edge of the top surface portion 20 . When the lid is closed, as indicated by the two-dot chain line in FIG. It is preferable that it is wound in the vertical direction. The belt-shaped label 3 is wound between a pair of stacking projections 25 and wound around the container along the Y direction. By arranging the two regions in which the stacking projections 25 are not formed on the periphery of the top surface portion 20 so as to face each other in the Y direction, the belt-shaped label 3 can be easily wound. An inclined surface 26 for facilitating winding of the belt-shaped label 3 may be provided at the boundary between the top surface 20 and the lid side surface 21 .

A flat portion 27 is formed inside the pair of stacking projections 25 in the top surface portion 20 in plan view. An endless ridge 28 protruding upward is formed in the central portion of the flat portion 27 . The shape of the projections 28 in a plan view (that is, the shape of the portion surrounded by the projections 28) is arbitrary and may be, for example, circular. be. When the ridge 28 is square, the vertical and horizontal directions of the square are the X direction and the Y direction. The ridge 28 is positioned between the pair of stacking projections 25 . The center of the area surrounded by the ridges 28, specifically, the center of the inscribed circle when the plan view shape is rectangular, and the center when it is circular (this center is hereinafter referred to as the ridge 28") may coincide with the center 2a of the lid 2 in a plan view, or may be provided eccentrically in one of the Y directions. In this embodiment, the center of the ridge 28 is provided eccentrically in the Y1 direction (first direction) of the Y directions, and is not eccentric in the X direction with respect to the center 2a of the lid 2 in plan view. .

The cross-sectional shape of the protrusion 28 may be various, for example, it may be curved upward in an arc shape, or it may be rectangular in cross section. It is preferable to provide the protrusion 28 with a notch crossing the protrusion 28 . Such notches include transverse grooves 29 in FIG. 5 or downward curved portions 40 in FIG. It is preferable that a plurality of transverse grooves 29 and downward curved portions 40 be provided at intervals in the circumferential direction of the ridge 28 . By providing the notch, even if the belt-shaped label 3 is wound, the steam in the protrusion 28 is easily discharged to the outside of the protrusion 28 through the notch. The downward curved portion 40 in FIG. 16 is particularly preferable because steam can be discharged efficiently even when the belt-shaped label 3 is wound.

The ridge 28 is formed so as to surround the periphery of the inverted dome-shaped concave portion 30. As shown in FIG. is preferably provided. The extension rib 42 protrudes upward. The extension ribs 42 preferably extend along the Y direction. A pair of extension ribs 42 are preferably provided facing each other in the X direction. The extension ribs 42 are preferably provided on both sides of the housing recess 34 in the X direction. The extension rib 42 preferably extends over substantially the entire length of the housing recess 34 in the Y direction. The extension rib 42 preferably extends from the stepped portion 41 , and preferably gradually increases in height as it separates from the stepped portion 41 , that is, as it separates from the ridge 28 . In addition, it is preferable that the accommodation recess 34 is continuously connected to the protrusion 28 and integrally formed.

When the accommodation recess 34 is substantially rectangular in plan view, three sides of the accommodation recess 34 are reinforced by one side of the protrusion 28 and the pair of extension ribs 42 . Since the extension rib 42 extends from the protrusion 28 in the Y direction, the strength of the top surface portion 20, particularly in the Y direction, is increased. Here, as shown in FIGS. 16 to 18 , when a downwardly curved portion 40 that curves downward is provided as a notch in the ridge 28 , the downwardly curved portion 40 crosses the ridge 28 . Downward curved portion 40 is preferably flush with flat portion 27 at its lowest point. When the projection 28 is rectangular in plan view, it is preferable to provide the downward curved portion 40 on each side of the projection 28 which is rectangular in plan view. It is preferable to provide step portions 41 that are one step lower at each corner of the projection 28 that is rectangular in plan view. The height of the stepped portion 41 is preferably one step higher than the flat portion 27 . By providing the downwardly curved portion 40 and the stepped portion 41, even when the belt-shaped label 3 is wound, the steam in the ridge 28 is easily discharged from the ridged portion 28 through the downwardly curved portion 40 and the stepped portion 41. .

A concave surface portion 30 for discharging steam is formed inside the projection 28 in a plan view. As shown in FIGS. 6 and 17 , the concave portion 30 can be set lower than the flat portion 27 . A ridge 28 is formed so as to surround the periphery of the concave portion 30 . A recessed wall surface 31 extends upward from the outer edge of the recessed surface portion 30 , and the recessed wall surface 31 is continuous with the ridge 28 . The recessed wall surface 31 extends, for example, vertically or spreads out from the outer edge of the recessed surface portion 30 . For example, as shown in FIG. 4, the apex of the concave portion 30 is eccentrically provided in the Y1 direction among the Y directions with respect to the center 2a of the lid 2 in plan view. However, the concave portion 30 does not have to be eccentric in the Y1 direction with respect to the center 2a of the lid 2 in plan view.

The concave surface portion 30 is a curved surface that bulges toward the inside of the container, and has an inverted dome shape with the lower side as the apex. The apex of the concave portion 30 is the lowest point in the cross-sectional view in the X direction and the Y-direction passing through the center of the inverted dome shape. 30a and coincides with the center of the ridge 28. The shape of the concave portion 30 in plan view corresponds to the shape of the projection 28 in plan view, and is square in plan view in this embodiment. The height of the concave portion 30 is the highest at the four corners of the square as shown in FIGS. 17(a) and 17(b).

5A and 16 show enlarged views of the concave portion 30. FIG. As shown in FIGS. 6 and 17, the concave portion 30 is a curved surface that curves downward, curving downward along the X direction and curving downward along the Y direction. The degree of curvature (curvature radius) of the concave surface portion 30 in the X direction and the degree of curvature (curvature radius) of the concave surface portion 30 in the Y direction may be the same, but may be different from each other. It is preferable that the concave portion 30 has a spherical shape curved in all directions.

A laser long hole 32 is formed in the curved surface of the concave portion 30 . The laser elongated hole 32 is a slit that penetrates the front and back of the sheet forming the lid 2 . The laser slots 32 are formed by melting the sheet by laser processing. That is, the laser slots 32 are slits formed by melting the sheet. The width W of the laser slot 32 (the dimension of the laser slot 32 in the direction perpendicular to the length direction of the laser slot 32) is 0.3 to 1 mm. The width W of the laser long hole 32 prevents the concave portion 30 from opening more than necessary due to the internal pressure of the container, and functions like a valve according to the internal pressure of the container to slightly expand the opening area. This is set from the viewpoint that the vapor in the container can be appropriately discharged from the laser long hole 32 to the outside of the container. If the width W of the laser long hole 32 is less than 0.3 mm, the vapor will not be smoothly discharged from the laser long hole 32, and the concave portion 30 will easily deform due to the pressure inside the container. If the width W of the laser long hole 32 exceeds 1 mm, a large amount of vapor is discharged from the laser long hole 32 to the outside of the container before the pressure inside the container reaches the predetermined pressure, and the steaming effect cannot be obtained. In addition, the pressure rise in the container is insufficient, the heating time becomes long, and foreign matter such as insects are likely to enter. The width W of the laser long hole 32 is preferably 0.3 to 0.8 mm, more preferably 0.3 mm to 0.7 mm. can be effectively performed.

A plurality of laser elongated holes 32 may be formed, preferably two, and in the present embodiment, a pair is formed facing the X direction. The pair of laser long holes 32 are arranged line-symmetrically with respect to a center line 101 along the Y direction of the concave portion 30 (a center line along the Y direction passing through the center 30a of the concave portion 30 in plan view) as an axis of symmetry. preferably. Also, the laser long hole 32 is preferably eccentrically provided in the Y2 direction (second direction) opposite to the Y1 direction with respect to the center 30a of the concave portion 30 in plan view. Most of the laser long holes 32 are located in the Y2 direction from the center line 100 along the X direction of the concave portion 30 (the center line along the X direction passing through the center 30a of the concave portion 30 in plan view). is preferred.

The shape of the laser long hole 32 may be various, and may be linear, curved, wave-shaped, or the like in plan view. For example, it may be linear extending along the Y direction as shown in FIG. , may be a straight line extending along a direction inclined with respect to the Y direction as shown in FIG. 14, or may be a straight line extending along the X direction as shown in FIG. 5, 7, 9, 10, and 16, it may be curved outward in the X direction in plan view, or it may be curved inward in plan view, as shown in FIGS. A curved shape may be used. In particular, it preferably has an outwardly curved shape in plan view, and preferably has an outwardly curved arc shape in plan view.

As described above, the width W of the laser long hole 32 is 0.3 to 1 mm, but the length is preferably 15 to 40 mm from the viewpoint of excellent function as a pseudo valve. The length of the laser slot 32 is, for example, the length when the laser slot 32 is straight as shown in FIGS. 14 and 15. For example, as shown in FIG. , it is the length of a line segment 32c connecting one end 32a and the other end 32b of the laser long hole 32 with a straight line. In FIG. 16, the line segment 32c is indicated by a two-dot chain line. It is particularly preferable that the length of the laser long hole 32 is 23 to 35 mm. On the other hand, the total opening area of the laser long holes 32 (if there are multiple laser long holes 32, the total area of them) should be 15 to 40 mm ² to achieve an appropriate internal pressure and enhance the steaming effect. preferred from

As shown in FIG. 5A, the arc center 33 of the laser elongated hole 32, which is arcuate in plan view, is preferably located in the Y2 direction relative to the center line 100 of the concave portion 30 along the X direction. Also, as shown in FIG. 5B, when the laser long hole 32 has an arc shape in plan view, the central angle θ of the arc is preferably 90 to 150 degrees.

Furthermore, the distance L1 in the X direction between the ends 32a of the pair of laser slots 32 in the Y1 direction is longer than the distance L2 in the X direction between the ends 32b of the pair of laser slots 32 in the Y2 direction. Long is preferred. That is, it is preferable that the separation distance in the X direction between the pair of laser long holes 32 is longer in the Y2 direction in most of the laser long holes 32 .

As shown in FIGS. 1, 4, and 16, it is also preferable to provide a housing recess 34 in the flat portion 27 of the top surface portion 20. FIG. For example, various small bags can be accommodated in the accommodation recess 34 . The sachet may contain, for example, a condiment for flavoring the food contained in the container. The accommodation recess 34 is preferably provided adjacent to the ridge 28 and the concave surface 30, and particularly preferably arranged side by side with the ridge 28 and the concave surface 30 in the Y direction. 28 and the concave surface portion 30 are preferably provided side by side in the Y2 direction. The accommodation recess 34 may have any shape in plan view, but may be, for example, a rectangular shape, particularly a rectangular shape elongated in the X direction.

The lid fitting portion 23 may have various shapes. The lid fitting portion 23 may have, for example, a reverse tapered shape in which the upper side is tapered inward, or may have a vertical shape or a forward tapered shape provided with a fitting convex portion protruding outward. In this embodiment, the lid fitting portion 23 is configured to have a fitting convex portion. The cross-sectional shape of the fitting convex portion may be various, and for example, it may be a shape that bulges outward in an arcuate shape or a trapezoidal shape when viewed in cross section. The position of the fitting convex portion may be various, such as the lower portion of the lid fitting portion 23, the middle portion in the vertical direction, the upper portion, and the like.

As an example, as shown in FIGS. 2 and 3, the lid fitting portion 23 has a lid fitting main portion 23a that extends substantially vertically along the vertical direction and a lid fitting convex portion 23b that protrudes outward. are doing. Most of the entire lid-fitting main portion 23a is located above the lid-fitting convex portion 23b. That is, the lid-fitting convex portion 23b is positioned below the lid-fitting portion 23, and the lid-fitting main portion 23a is positioned above the lid-fitting portion 23. As shown in FIG.

The cross-sectional shape of the lid fitting projection 23b preferably corresponds to the cross-sectional shape of the body fitting recess 13b. It is preferable that the lid-fitting convex portion 23b and the body-fitting concave portion 13b have curved surfaces with substantially the same curvature. It is preferable that the lid-fitting protrusion 23b is provided over the entire circumference. Furthermore, the lid fitting portion 23 preferably has a curved portion 23c on the upper side of the lid fitting main portion 23a, that is, at the upper end portion of the lid fitting portion 23. As shown in FIG. The curved portion 23c is connected to the upper side of the lid fitting main portion 23a. The curved portion 23c is curved outward in the up-down direction.

In addition, in order to prevent the so-called blocking phenomenon in which the lids 2 are tightly fitted to each other and cannot be removed when a large number of lids 2 are stacked at the time of collection, the lid side surface portion 21 has an anti-blocking projection (illustrated). omitted) may be provided. The anti-blocking projections are arranged at different positions for each cover 2.例文帳に追加

The shape of the lid flange portion 24 is arbitrary, but in this embodiment, the main flange portion 24a extends substantially horizontally outward from the upper end of the curved portion 23c, and the skirt portion 24b descends from the outer edge of the main flange portion 24a. , and a lid border portion 24c extending outwardly from the lower end of the skirt portion 24b. As shown in FIG. 1, the outer edge of the lid flange portion 24 may be provided with a lid knob portion 35 for facilitating the lid opening operation. The lid edge portion 24c may be formed with a large number of very fine irregularities to reinforce it and prevent a finger from being cut even if it hits the lid edge portion 24c. The unevenness has a wavy shape when viewed enlarged from the front, and the directions of many peaks and valleys are along the inside and outside directions of the container. Further, the unevenness is formed by, for example, flat knurling or twilled knurling, and is preferably formed by twilled knurling in order to prevent slippage.

<Lid closed state>
FIG. 3 shows the closed state. The lid extending portion 22 abuts on the step portion 14 or faces them with a gap therebetween. The lid fitting projection 23b fits into the body fitting recess 13b, and the lid fitting main portion 23a fits into the body fitting main portion 13a. When the lid 2 is attached to the container body 1, the lid-fitting convex portion 23b descends while sliding on the body-fitting main portion 13a, and eventually fits into the body-fitting concave portion 13b. Therefore, when the lid fitting convex portion 23b is fitted into the body fitting concave portion 13b, a click feeling is transmitted to the operator's hand, and the operator can attach the lid 2 to the proper position by the click feeling. can know Further, if the lid fitting convex portion 23b and the body fitting concave portion 13b have curved surfaces with substantially the same curvature, the fitting strength is further increased by surface contact between them.

In addition to the lid closed state shown in FIG. 3, for example, as shown in FIG. The portion 23 may have an inversely tapered shape that extends inward toward the upper side.

Further, for example, the main body fitting portion 13 may have a reverse tapered shape, and the lid fitting portion 23 may have a fitting protrusion as shown in FIG. Further, in the case where the lid fitting portion 23 has a fitting convex portion, a curved portion that curves inward along the vertical direction is provided on the upper and lower sides of the fitting convex portion instead of the straight portion. may be

The curved portion 23c contacts the beaded portion 15 of the body flange portion 12 from the inside. Preferably, the curved portion 23c is in annular line contact with the beaded portion 15 along the circumferential direction. That is, the curved portion 23c makes point contact with the bead portion 15 in a cross-sectional view. The bead-shaped portion 15 is curved upwardly convex along the inside-outside direction, and the curved portion 23c is curved outwardly convex along the up-down direction. Therefore, in a cross-sectional view, the curved portion 23c can reliably come into point contact with the bead portion 15 from the inside and obliquely upward. Since the curved portion 23c contacts the beaded portion 15 in this manner, the curved portion 23c is pressed against the beaded portion 15 with a strong pressure, and the contact between the curved portion 23c and the beaded portion 15 is assured. As a result, the inner fitting force between the container body 1 and the lid 2 is enhanced, and the oozing and leaking of the soup or the like can be prevented satisfactorily.

The lid flange portion 24 abuts on the main body flange portion 12 or faces the upper side of the main body flange portion 12 with a space therebetween. In this embodiment, the lid flange portion 24 faces the upper side of the beaded portion 15 of the main body flange portion 12 with a gap therebetween, but may be in contact with the same.

Food containing liquid such as soup is placed in the container body 1, and a lid 2 is attached to the container body 1. - 特許庁Since the width of the laser long hole 32 is 0.3 to 1 mm, it is possible to effectively prevent foreign matter from entering. In addition, since the concave portion 30 has an inverted dome shape, it is strong against external force and is hard to deform. Also, when the containers with the lids closed are stacked one on top of the other, the upper container is less likely to come into contact with the concave portion 30 . Moreover, a ridge 28 is provided around the concave surface 30, and the ridge 28 functions as a protective wall to protect the concave surface 30, and the ridge 28 prevents the upper container from coming into contact with the concave surface 30. prevent effectively. In addition, since the protrusions 28 are provided around the concave surface portion 30, the strength of the top surface portion 20 is further increased, and the top surface portion 20 is less likely to deform, so that the concave surface portion 30 is also less likely to deform. Therefore, it is possible to effectively prevent the laser long hole 32 from widening and foreign matter from entering therethrough.

In addition, while the concave portion 30 is provided eccentrically in the Y1 direction in plan view with respect to the center 2a of the lid 2, the laser long hole 32 is arranged in the Y2 direction in plan view with respect to the center 30a of the concave portion 30. Since it is provided eccentrically, the liquid is less likely to leak out from the long laser hole 32 even when the container in the closed state is tilted.

Then, the user can heat and cook by putting it in the microwave oven with the lid closed. By heating the food in the microwave oven, the food inside the container is warmed, steam is generated, and the pressure inside the container rises. Since the width W of the laser elongated hole 32 is 0.3 to 1 mm, the pressure inside the container can be increased to a predetermined pressure, and a steaming effect can be obtained for cooking in a short time. Even if the pressure inside the container increases, the lid fitting protrusion 23b is fitted to the body fitting protrusion 13b, so the lid 2 is unlikely to come off, and the pressure inside the container can be easily increased. It is possible to heat and cook for hours.

When the pressure inside the container rises to a predetermined pressure, the laser elongated hole 32 opens slightly according to the pressure, and the vapor is smoothly discharged to the outside of the container, preventing an excessive pressure rise. Even if the pressure inside the container increases, the concave surface portion 30 has an inverted dome shape and the width W of the laser long hole 32 is 0.3 to 1 mm. 30 itself retains its inverted dome shape with little deformation. Since the inverted dome shape of the concave portion 30 is maintained, the steam can be discharged as designed from the long laser hole 32 designed to have a predetermined width, and the steam can be smoothly discharged while maintaining the steaming effect. can be done.

In particular, when the laser long hole 32 is curved outward in an arc shape when viewed from above as shown in FIGS. functions like a pseudo-valve and can expand its opening area, suppressing a rapid pressure rise inside the container, and preventing the lid from coming off from the container body 1. can. Incidentally, when the belt-shaped label 3 is wound, the vapor discharged from the laser slots 32 passes through the notch of the projection 28 and is discharged to the outside of the projection.

In addition, the protrusion 28 is not limited to a rectangular shape in plan view, and may be circular in plan view as shown in FIGS. 7 and 8 .

1 container body 2 lid 2a center 3 strip label 10 bottom surface 11 body side surface 12 body flange 13 body fitting portion 13a body fitting main portion 13b body fitting concave portion 14 step portion 15 ball-shaped portion 16 body border portion 20 Top surface portion 21 Lid side surface portion 22 Lid extension portion 23 Lid fitting portion 23a Lid fitting main portion 23b Lid fitting convex portion 23c Curved portion 24 Lid flange portion 24a Flange main portion 24b Skirt portion 24c Lid border portion 25 Stacking projection Part 26 Inclined surface 27 Flat part 28 Ridge 29 Transversal groove (notch)
30 concave portion 30a center 31 concave wall surface 32 laser long hole 32a end 32b end 32c line segment 33 arc center 34 accommodating concave portion 35 lid knob portion 40 downward curved portion (notch portion)
41 stepped portion 42 extended rib 100 center line 101 along the X direction center line Y1 along the Y direction first direction Y2 second direction

Claims (4)

A lid for a microwave oven container that fits inside the container body,
The top surface is provided with an inverted dome-shaped concave surface that bulges downward,
A lid for a container for a microwave oven, wherein a curved surface of a concave portion is provided with a laser elongated hole with a width of 0.3 mm to 1 mm for discharging steam, which is curved in an arc shape in a plan view . The concave portion is provided eccentrically in a first direction in plan view with respect to the center of the lid, and the laser long hole is provided in a second direction opposite to the first direction in plan view with respect to the center of the concave portion. 2. The lid of the microwave oven container according to claim 1 , which is provided eccentrically to the . 3. The lid for a container for microwave oven according to claim 1 , wherein the top surface portion is provided with an upwardly protruding ridge surrounding the concave portion. A microwave oven container comprising a container body and the lid according to any one of claims 1 to 3 .

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