JP2021046221A - Lid and container with lid - Google Patents

Abstract

To provide a lid which does not inhibit an inflow of the outside air into a container after heating cooking is finished, and to provide a container with a lid.SOLUTION: There is provided a lid 20 of a container 1 with a lid for microwave heating food which includes: a container body 10; the lid 20 fitted in an upper opening of the container body 10; and a covering member 40 for covering at least a part of the lid 20. The lid includes: a ventilation part 22 for ventilating the outside and inside of the container 1 with a lid; an outer periphery protrusion part 23 positioned around the ventilation part 22, and formed being protruded to the outside of the container 1 with a lid from a surface (upper surface 21) of the lid 20; and an inside protrusion part 24 positioned inside the outer periphery protrusion part 23, and formed being protruded to the outside of the container 1 with a lid from the surface of the lid 20. At least an inside portion surrounded with the outer periphery protrusion part 23 is covered by the covering member 40.SELECTED DRAWING: Figure 1

Description

The present invention relates to a lid in a container with a lid for microwave-heated foods and a container with a lid.

Many processed foods are sold at normal temperature or lower temperatures at stores such as supermarkets and convenience stores, and after purchase, they are cooked in a microwave oven and eaten. Some of these processed foods are introduced into a microwave oven and heated while the food is in a container when it is cooked in a microwave oven.

When food is heated together with the container in a microwave oven, the lid of the container may come off from the main body or the container may be damaged due to the expansion of air and the increase in the internal pressure of the container due to the vaporized steam of the water contained in the food in the container. May cause problems such as In order to prevent such a problem, it is necessary to discharge the expanded air and the generated steam to the outside of the container. In addition to air and steam, steam (liquid) also exists inside the container depending on the state of temperature, etc., and it circulates with the outside of the container, but it is not strictly distinguished, and it is circulated according to the explanation. Although it is described as "gas or liquid" or "steam" as a thing, even if it is described as "steam", it may contain air or steam (liquid). In addition, the air flowing from the outside of the container to the inside may be referred to as "outside air".

The lid used for a container intended for cooking in a microwave oven is generally formed with a vent for discharging steam to the outside of the container (see, for example, Patent Documents 1 and 2). However, due to the presence of the ventilation portion, the inside of the container and the outside of the container are always open. And the ventilation part has a sufficient size to discharge steam. Therefore, there is a risk that foreign matter may enter the inside of the container from the ventilation part during sales or transportation at the store. Therefore, in order to prevent such foreign matter from being mixed in, a covering member such as a ring-shaped shrink film is provided, and the covering member is configured to cover the ventilation portion.

Japanese Unexamined Patent Publication No. 2014-911542 Japanese Unexamined Patent Publication No. 2017-81599

In the containers of Patent Documents 1 and 2, steam is discharged to the outside of the container from the ventilation portion during cooking. After the cooking is completed, the steam in the container is rapidly cooled, and the volume is reduced to reduce the pressure inside the container. At this time, the outside air flows from the outside of the container to the inside of the container through the ventilation part, but the covering member is attracted to the ventilation part and comes into close contact with the ventilation part to block the ventilation part, and the outside air flows from the outside of the container to the inside of the container. May interfere with. If the steam inside the container is cooled in this state, the container cannot withstand the internal decompression, and there is a risk that the container may be deformed, damaged, or the contained food may flow out.

An object of the present invention is to provide a lid and a container with a lid that do not obstruct the inflow of outside air into the container after the completion of cooking.

The first invention for solving the above-mentioned problems is a microwave oven including a container body, a lid fitted to an upper opening of the container body, and a covering member covering at least a part of the surface of the lid. A lid in a container with a lid for cooked foods. Such a lid includes a ventilation portion that ventilates the inside and outside of the container with a lid, an outer peripheral protrusion that is located around the ventilation portion and is formed so as to project outward from the surface of the lid to the outside of the container with a lid, and the outer circumference protrusion. It is provided with an inner protruding portion that is located inside the portion and is formed so as to project outward from the surface of the lid to the outside of the container with a lid. Then, at least the inner portion surrounded by the outer peripheral protrusion is covered with the covering member.

According to the lid having such a configuration, even if the inside of the container is depressurized after the completion of cooking and the covering member is attracted to the ventilation portion, the covering member is formed from the surface of the lid by the outer peripheral protrusion and the inner protrusion. Since it is supported at a distant height, it does not stick to the surface of the lid. Therefore, the covering member does not block the ventilation portion, and a space can be secured around the ventilation portion. Therefore, the inflow of outside air into the container is not hindered after the cooking is completed.

In the lid according to the present invention, the outer peripheral protrusion includes the surface of the lid and the outer peripheral protrusion under a state in which the covering member covers at least the entire surface of the projection shape formed by the outer peripheral protrusion. It is preferable to provide an internal / external distribution portion that enables the flow of gas or liquid inside and outside the space portion surrounded by the covering member. According to such a configuration, a flow path connected to the ventilation portion is secured, so that the flow of gas or liquid becomes smooth.

Further, the ventilation portion has a flap, the portion where the flap is connected to the lid is the flap base end portion, and the portion opposite to the flap base end portion is the flap which is the highest when the flap is movable. As for the tip portion, it is preferable that the inner protruding portion is formed further outside the flap tip portion. The outside of the flap tip portion referred to here is a portion located on the surface of the lid on the side opposite to the flap base end portion in the vicinity of the flap tip portion. According to such a configuration, a flow path can be secured in the vicinity of the tip of the flap where the opening is the largest in the ventilation portion, so that efficient gas or liquid flow is possible.

Further, the venting portion is preferably composed of a group of micropores composed of a plurality of micropores.

On the other hand, the venting portion is preferably formed so as to surround the inner protruding portion. According to such a configuration, since the ventilation portion is formed around the inner protrusion that can secure the flow path, efficient gas and liquid flow can be performed.

A second invention for solving the above-mentioned problems is a container with a lid for microwave-heated food, which comprises a container body, a lid fitted in an upper opening of the container body, and at least one of the lids. It is provided with a covering member that covers the surface of the portion. The lid has a ventilation portion that ventilates the inside and outside of the container with a lid, an outer peripheral protrusion that is located around the ventilation portion and is formed so as to project outward from the surface of the lid and the outer circumference. The covering member includes an inner protruding portion that is located inside the protruding portion and is formed so as to project outward from the surface of the lid to the outside of the container with a lid, and the covering member covers at least the entire inner portion surrounded by the outer peripheral protruding portion. It is characterized in that it is mounted so as to cover it.

According to the container with a lid having such a configuration, as in claim 1, the covering member does not block the ventilation portion, and a space can be secured around the ventilation portion. Therefore, the inflow of outside air into the container is not hindered after the cooking is completed.

According to the present invention, the inflow of outside air into the container is not hindered after the completion of cooking, and the flow of gas or liquid can be satisfactorily performed.

It is a perspective view which showed the container with a lid which concerns on embodiment of this invention. It is a main part plan view which showed the lid which concerns on embodiment of this invention. It is a main part perspective view which showed the lid which concerns on embodiment of this invention. (A) is a sectional view taken along line IV-IV of FIG. 2 showing a lid according to an embodiment of the present invention, and (b) is a sectional view taken along line IV-IV of FIG. 2 in which a covering member is further added. FIG. 2A is a sectional view taken along line VV of FIG. 2 showing a lid according to an embodiment of the present invention, and FIG. 2B is a sectional view taken along line VV of FIG. 2 in which a covering member is further added. It is a figure which showed the lid which concerns on embodiment of this invention, (a) is the main part perspective view which showed the state which steam is discharged, (b) is the main part perspective view which showed the state which outside air flows in. Is. It is a main part perspective view which showed the lid which concerns on the modification of embodiment of this invention. It is sectional drawing of the main part which showed the lid which concerns on the modification of embodiment of this invention. It is a figure which showed the lid which concerns on the modification of embodiment of this invention, (a) is the perspective view of the main part which showed the state of discharging steam, (b) is the figure which showed the state of inhaling outside air. It is a perspective view. (A) to (d) are perspective views of a main part showing a lid according to a modified example of the embodiment of the present invention. (A) to (e) are plan views of a main part showing a lid according to a modified example of the embodiment of the present invention. (A) to (e) are plan views of a main part showing a lid according to a modified example of the embodiment of the present invention.

The lid of the container with a lid for microwave-heated foods and the embodiment of the container with a lid, which is the present invention, will be described below with reference to those drawings. However, the embodiments of the present invention are not limited to the embodiments described below. It should be noted that the container with a lid for microwave-heated food is to be put in a microwave oven with the lid attached and cooked by accommodating the food.

<Overall configuration of container with lid for microwave-heated food>
The first embodiment of the present invention includes a "container body", a "lid" fitted to the upper opening of the container body, and a "covering member" that covers at least a part of the surface of the lid. It is the "lid" of the "container with lid" for microwave-heated foods.

<Container body, its material and shape, and its molding method>
The container body according to the present invention is a part for storing food. The material of the container body is not particularly limited, but examples thereof include synthetic resin and paper in consideration of heat resistance in order to be easy to mold and to be heated by a microwave oven. From the viewpoint of moldability, fitability with a lid, and convenience, polypropylene or expanded polystyrene sheets containing an inorganic filler are particularly preferably used as a material. The container body has an opening at the upper part, and a lid is fitted in the opening. Further, there is no particular limitation on the overall shape of the container body. Further, the shape of the opening of the container body is not particularly limited, and can be made into a circular shape, an elliptical shape, a polygonal shape of a triangle or more, other free shapes, and various shapes. For example, the upper part opens in a circular shape. A bowl shape is preferably adopted. Further, a collar portion for fitting with the lid is formed on the peripheral edge of the upper opening of the container body.

A known molding method suitable for the material can be adopted for the container body, but when molding from a synthetic resin sheet, a known vacuum forming method, vacuum forming method or vacuum forming method, or press molding is usually performed. The law is preferably adopted. In the vacuum forming method, the compressed air forming method, or the vacuum forming method, a hot plate may be used as a heating means for the synthetic resin sheet, and in this case, it may also be referred to as a hot plate molding method. Further, the container body may be molded by injection molding or blow molding, not limited to these molding methods.

<Lid, its material and shape, and its molding method>
The material of the lid is not particularly limited, and is appropriately selected from styrene resin, synthetic resin such as polyethylene terephthalate and polypropylene. Biaxial styrene resin for reasons such as having strength suitable for the purpose of use, easy molding, heat resistance that can withstand heating in a microwave oven, transparency, and economy. A stretched sheet can be preferably used.
The shape of the lid is also not particularly limited, but it is fitted to the upper opening of the container body. Therefore, a fitting portion to be fitted to the flange portion of the container body is usually formed on the outer peripheral edge portion of the lid.

The styrene-based resin is a general term for resins containing a styrene-based resin having a styrene monomer unit as a basic structure as a main component. The type of the styrene resin is not limited, but it is particularly preferable that the resin is a styrene-methacrylic acid copolymer. In this case, the methacrylic acid monomer unit contained in the styrene resin is 2 mass by mass. % Or more and 20% by mass or less, more preferably 3% by mass or more and 16% by mass or less. Styrene-based resins containing less than 2% by mass of methacrylic acid monomer units may lack heat resistance for use in a microwave oven, and biaxial stretching when the methacrylic acid monomer unit exceeds 20% by mass. There is concern about adverse effects on the appearance of the sheet.

The weight average molecular weight (Mw) of the styrene-methacrylic acid copolymer is preferably 120,000 to 250,000, more preferably 140,000 to 220,000, and even more preferably 150,000 to 200,000. If the weight average molecular weight of the styrene-methacrylic acid copolymer is less than 120,000, sheet drawdown and neck-in occur, resulting in deterioration of sheet film forming property, insufficient drawing orientation, and contact with hot plates during container molding. Surface roughness is likely to occur due to. On the other hand, when the weight average molecular weight of the styrene-methacrylic acid copolymer exceeds 250,000, uneven thickness during sheet film formation due to reduced fluidity, deterioration of sheet appearance such as die lines, and poor shaping during container molding occur. It will be easier.

Further, the value of the ratio Mw / Mn of the weight average molecular weight (Mw) and the number average molecular weight (Mn) of the styrene-methacrylic acid copolymer is preferably 2.0 to 3.0, more preferably 2 It is .2-2.8. When the value of Mw / Mn exceeds 3.0, surface roughness due to contact with a hot plate during container molding is likely to occur. On the other hand, if the value of Mw / Mn is less than 2.0, uneven thickness during film formation due to a decrease in fluidity and improper molding during container molding are likely to occur. The value of the ratio Mz / Mw between the Z average molecular weight (Mz) and Mw is preferably 1.5 to 2.0, more preferably 1.6 to 1.9. When the value of Mz / Mw is less than 1.5, the drawdown of the sheet, the deterioration of the film-forming property such as the tendency of neck-in to occur, and the insufficient drawing orientation are likely to occur. On the other hand, when the value of Mz / Mw exceeds 2.0, unevenness in thickness during sheet film formation due to a decrease in fluidity and deterioration in the appearance of the sheet such as die lines are likely to occur.

The above-mentioned number average molecular weight (Mn), weight average molecular weight (Mw), and Z average molecular weight (Mz) are generally commercially available monodisperses having a known molecular weight under the following devices and measurement conditions in GPC measurement. The molecular weight at each elution time was calculated from the elution curve of standard polystyrene, and it is a value calculated as the molecular weight in terms of polystyrene.
Model: Showa Denko Corporation Shodex GPC-101
Column: Polymer Laboratories PLgel 10 μm MIXED-B
Mobile phase: tetrahydrofuran Sample concentration: 0.2% by mass
Temperature: Oven 40 ° C, inlet 35 ° C, detector 35 ° C
Detector: Differential refractometer

The styrene resin preferably has a Vicat softening temperature in the range of 106 to 132 ° C. If the Vicat softening temperature is less than 106 ° C., the heat resistance of the sheet is insufficient, and deformation is likely to occur when heating in a microwave oven. The Vicat softening temperature is preferably 112 ° C. or higher, more preferably 116 ° C. or higher. On the other hand, if the Vicat softening temperature exceeds 130 ° C., the workability during film formation and container molding may decrease. The Vicat softening temperature is preferably 128 ° C. or lower. The Vicat softening temperature referred to here is a measured value under the conditions of a heating rate of 50 ° C./hr and a test load of 50 N in accordance with JIS K-7206.

Furthermore, various additives such as antioxidants, lubricants, and antigelling agents are added to the synthetic resin that is the material of the lid, and the molding process is heat-processed by irradiating a laser beam (hereinafter also referred to as "laser processing"). When using, for example, when the vent of the lid is formed by laser processing, rubber reinforced polystyrene (HIPS) can be added. As the rubber-reinforced polystyrene, generally commercially available rubber-reinforced polystyrene having a rubber component content of 5.0 to 12.0% by mass can be used.

In particular, when a styrene resin to which rubber-reinforced polystyrene is added is used as the material of the lid, the content ratio of the rubber component in the styrene resin is preferably 0.05 to 0.35% by mass. If the content ratio of the rubber component is less than 0.05% by mass, the biaxially stretched sheet of the styrene resin transmits a laser beam, which makes laser processing difficult. When the content ratio of the rubber component is 0.05% by mass or more, the biaxially stretched sheet made of the styrene resin can absorb the laser beam and be processed in a short time. However, if the content ratio of the rubber component exceeds 0.35% by mass, the transparency of the biaxially stretched sheet is lowered, which is not preferable.

The average rubber particle size of the rubber component in the biaxially stretched sheet is preferably 1 to 9 μm. If the average rubber particle size is less than 1 μm, the biaxially stretched sheet does not absorb the laser beam and transmits it. As a result, it becomes difficult to perforate with a laser beam. When the average rubber particle size is 1 μm or more, the biaxially stretched sheet absorbs the laser beam and converts the laser beam into heat, so that perforation can be easily performed. On the other hand, if the average rubber particle size exceeds 9 μm, the transparency of the biaxially stretched sheet decreases, which is not preferable.

The average rubber particle size of the rubber component in the biaxially stretched sheet is determined by cutting the observation surface in the direction parallel to the sheet plane by the ultrathin section method, dyeing the rubber component with osmium tetroxide (OsO4), and then dyeing the rubber component. The major axis of 100 particles was measured with a transmission microscope, and the value was calculated by the following formula. Here, the major axis is the maximum length of a straight line connecting two points on the outer circumference of the particle.
Average rubber particle size = Σni (Di) 4 / Σni (Di) 3 (ni: number of measurements, Di: measured particle size (major axis))

The content ratio of the rubber component in the styrene resin referred to here is measured by the iodine monochloride method. That is, after dissolving styrene resin in chloroform and adding iodine monochloride to react with the double bond in the rubber component, potassium iodide is added to change the remaining iodine monochloride to iodine, and sodium thiosulfate is used. Measured by back titration.

<Biaxial stretching sheet>
The biaxially stretched sheet of the styrene resin can be produced by the method shown below using the styrene resin as a raw material. First, the styrene resin is melt-kneaded by an extruder to extrude an unstretched sheet from a die (particularly a T die). Next, by stretching the unstretched sheet sequentially or simultaneously in the biaxial directions of the vertical direction (sheet flow direction, MD; Machine Direction) and the horizontal direction (direction perpendicular to the sheet flow direction, TD; Transverse Direction). , A biaxially stretched sheet is manufactured.

The thickness of the biaxially stretched sheet is preferably 0.1 mm or more, more preferably 0.15 mm or more, still more preferably 0.2 mm or more in order to secure the strength of the sheet and the packaging container, particularly the rigidity. .. On the other hand, from the viewpoint of moldability and economy, the thickness of the biaxially stretched sheet is preferably 0.7 mm or less, more preferably 0.6 mm or less, still more preferably 0.5 mm or less.

The stretching ratios of the biaxially stretched sheet in both the longitudinal direction and the lateral direction are preferably in the range of 1.8 to 3.2 times. If the draw ratio is less than 1.8 times, the folding resistance of the sheet tends to decrease. On the other hand, if the draw ratio exceeds 3.2 times, the shrinkage rate during thermoforming may be too large and the shapeability may be impaired.

For the lid in the container with a lid for microwave-heated foods of the present invention, a known manufacturing method suitable for the material can be adopted, but when the lid is manufactured from a synthetic resin sheet, a known vacuum forming method is usually used. , A vacuum forming method or a vacuum forming method, a press forming method, a hot plate forming method using a hot plate, or the like is preferably adopted. Further, the lid may be molded by injection molding or blow molding, not limited to these molding methods.

As described above, the lid in the container with a lid for microwave-heated foods of the present invention has a "vent" that ventilates the inside and outside of the container with a lid, and a lid located around the vent and from the surface of the lid. An "outer peripheral protrusion" formed by projecting outward from the attached container, and an "inner protruding portion" formed inside the outer peripheral protrusion and protruding outward from the surface of the lid. It has. Further, the outer peripheral protrusion is surrounded by the surface of the lid, the outer peripheral protrusion, and the covering member under a state in which the covering member covers at least the entire surface of the projection shape formed by the outer peripheral protrusion. It is preferable to provide an "inside / outside distribution section" that enables the flow of steam inside and outside the space portion.

<Position, shape and number of ventilation parts, and their molding method>
There is no particular limitation on the position, shape and number of ventilation portions related to the lid in the container with a lid for microwave-heated foods of the present invention. The shape of the ventilation portion may be a small hole, a long hole, or a flap shape whose opening degree changes depending on the internal pressure of the container, and when a plurality of ventilation portions are present, they do not have to have the same shape. However, in order to prevent foreign matter from entering the container with a lid and to secure a sufficient steam flow path area, the shape must be such that a sphere with a diameter of 0.7 mm, which assumes foreign matter including insects, cannot pass through. Further, it is preferable that the total area of the ventilation portion is 100 mm ^{2 or more.} The method for forming the vent is not particularly limited, but a method of mechanically punching a hole in the upper surface of the formed lid or a method of forming a hole by irradiating a laser beam is usually preferably adopted.

<Position, shape and number of outer peripheral protrusions, and their molding method>
Regarding the position, shape, and number of the outer peripheral protrusions relating to the lid in the container with a lid for microwave-heated foods of the present invention, the outer peripheral protrusions are located around the ventilation portion, and the lid is formed from the surface of the lid. There is no further limitation as long as it is formed so as to project outward from the attached container. The method of molding the outer peripheral protrusion is not particularly limited, but a method of molding the entire lid at the same time as a part thereof is usually preferably adopted.

<Position, shape and number of inner protrusions, and their molding method>
Regarding the position, shape, and number of the inner protrusions relating to the lid in the container with a lid for microwave-heated foods of the present invention, the inner protrusion is located inside the outer protrusion and is from the surface of the lid. There is no further limitation as long as it is formed so as to project outward from the container with a lid. The method of molding the inner protruding portion is not particularly limited, but a method of molding the entire lid at the same time as a part thereof is usually preferably adopted.

<Position, shape and number of internal and external distribution parts, and their molding method>
Regarding the position, shape, and number of the internal and external distribution portions related to the lid in the container with a lid for microwave-heated foods of the present invention, the covering member covers at least the entire surface of the projected shape formed by the outer peripheral protrusion. Further limitation is provided as long as it has a function of enabling the flow of steam inside and outside the space surrounded by the surface of the lid, the outer peripheral protrusion, and the covering member under the state. There is no. The inner / outer distribution portion is generally formed by providing portions having different heights on the outer peripheral protruding portion and providing a gap between the covering members. The molding method of the inner flow portion is not particularly limited, but a method of molding the entire lid at the same time as a part thereof is usually preferably adopted.

<Coating member, its material and shape>
The covering member according to the present invention is a member for preventing foreign matter from entering the inside of the container during sale or transportation in a store and preventing the lid from coming off from the container body. The material used for the covering member is not particularly limited, but it is preferably a material that can withstand microwave heating and is a transparent material. Examples of such a material include polyester, polypropylene, styrene-methacrylic acid copolymer and the like. Further, although the shape, width and length of the covering member are not limited, it is preferable that the covering member has a closed band shape in which both ends are joined to each other, and the container body and the lid fitted to the container body are mounted so as to surround them. It is preferable to have. In this case, it is preferable to cover at least the entire circumference of the outer peripheral protrusion of the lid from the viewpoint of preventing foreign matter from entering.

<Container with lid>
A second embodiment of the present invention includes the container body described above, a lid fitted to the upper opening of the container body, and a covering member covering at least a part of the surface of the lid. , A ventilation portion that ventilates the inside and outside of the container with a lid, an outer peripheral protrusion that is located around the ventilation portion and is formed so as to project outward from the surface of the lid, and an outer peripheral protrusion. It is provided with an inner projecting portion that is located inside and is formed so as to project outward from the surface of the lid to the outside of the container with a lid, and the covering member covers at least the entire inner portion surrounded by the outer peripheral projecting portion. It is a "container with a lid" characterized by being attached.

Hereinafter, embodiments of the lid and the container with a lid of the present invention will be described in more detail with reference to the drawings of the examples. However, the present invention is not limited to these examples.

<Example 1>
In FIG. 1, the entire configuration of the lid and the container with a lid of the first embodiment is shown as the container with a lid 1. The container 1 with a lid is composed of a container body (10 in FIG. 1), a lid (20 in FIG. 1), and a covering member (40 in FIG. 1). Hereinafter, when a specific description is made in relation to the drawings, for example, when a "lid (20 in FIG. 1)" is described, the object is simply described in the manner of the "lid 20" and the description is described.

The container body 10 of the first embodiment according to the present invention has an opening at the upper portion, and a collar portion (not shown) for fitting with the lid 20 is formed at the peripheral edge of the upper opening. ing. A lid 20 is fitted in the opening. A fitting portion 26 of the lid 20 to be fitted to the flange portion of the container body 10 is formed on the outer peripheral edge portion of the lid 20. The upper surface 21 of the lid 20 is formed in a flat circular shape, and is arranged at a position higher than the upper opening of the container body 10. The lid 20 includes a ventilation portion 22, an outer peripheral protrusion 23, and an inner protrusion 24. The ventilation portion 22 is a flap-shaped ventilation portion.

The outer peripheral protrusion 23 provided on the lid 20 of the first embodiment is an outer peripheral protrusion 28, 28 composed of a pair of U-shaped continuous protrusions 28, 28, that is, a generic term for the continuous protrusions 28, 28 combined. The outer peripheral protrusion 23 of the lid 20. The continuous protrusions 28, 28 are arranged so that their ends face each other so as to surround the ventilation portion 22. Further, the continuous projecting portions 28, 28 are formed so as to project outward from the surface of the upper surface 21 of the lid 20 and have a semicircular cross-sectional shape. The portion of the gap between the opposite ends of the continuous protrusions 28, 28 corresponds to the internal / external distribution portion 29 included in the outer peripheral protrusion 23. The outer peripheral protrusions 23 (continuous protrusions 28, 28) support the covering member 40 in a state of being lifted from the surface of the upper surface 21 of the lid 20 so that the ventilation portion 22 and the covering member 40 do not come into close contact with each other.

2 and 3 are views showing the periphery of the ventilation portion of the container with lid 1 shown in FIG. 1 from above or diagonally above. The ventilation portion 22 provided on the lid 20 of the first embodiment is a portion for ventilating the inside and outside of the container with a lid 1, and steam generated during cooking is discharged to the outside of the container through the ventilation portion 22. One ventilation portion 22 is formed in the central portion of the upper surface 21. The ventilation portion 22 has a U-shaped flap 25, the upper portion of the U-shape is connected to the upper surface 21 of the lid 20, and the peripheral edge along the U-shape is cut from the upper surface 21 to be formed. Hereinafter, the side connected to the upper surface 21 is referred to as the base end side of the flap 25, and the side away from the upper surface 21 is referred to as the tip end side of the flap 25. The flap 25 is formed by making a U-shaped notch in a plan view on the upper surface 21 with a blade. The length of the flap 25 in the height direction of the U-shape is, for example, 16 mm, and the length of the flap 25 in the width direction of the U-shape is, for example, 12 mm.

The height dimension and the width dimension of the continuous protrusions 28, 28 of the first embodiment are both 5 mm. The overall shape of the outer peripheral protrusions 23, that is, the virtual shape connecting the gaps between the opposite ends of the continuous protrusions 28, 28, has the shape of a rectangular frame in a plan view. The dimensions of each side of the outer shell of the rectangular frame are, for example, 50 mm. The outer peripheral protruding portion 23 can preferably be provided with the inner / outer distribution portion 29, but the inner / outer distribution portion 29 is preferably formed by providing portions having different heights on the outer peripheral protruding portion 23. The inner / outer distribution portion 29 has a surface (upper surface 21) of the lid 20, an outer peripheral protruding portion 23, and a covering member 40 under a state in which the covering member 40 covers at least the entire surface of the projected shape formed by the outer peripheral protruding portion 23. It is preferable that the inside and outside of the space surrounded by the above are formed so as to be a flow path that enables the flow of steam. In the lid 20, the gap between the end portions of the continuous protrusions 28, 28 facing each other is, for example, 15 mm, and the gap portion between the ends is provided in the inner / outer distribution portion 29 provided in the outer peripheral protrusion 23. Equivalent to. That is, in the present embodiment, the internal / external distribution unit 29 is composed of two gaps (portions without the continuous protrusions 28) between the continuous protrusions 28 and 28. The number, size, and position of the internal / external distribution unit 29 are not limited to this embodiment, and can be changed as appropriate.

The inner protruding portion 24 of the first embodiment is a portion inside the outer peripheral protruding portion 23 for preventing the covering member 40 from coming into close contact with the upper surface 21 in the vicinity of the venting portion 22 and blocking the venting portion 22. The inner protruding portion 24 is located inside the outer peripheral protruding portion 23, and is formed so as to project outward from the surface (upper surface 21) of the lid 20 to the outside of the container with a lid 1. The inner protruding portion 24 is formed between the flap 25 and the inner / outer distribution portion 29 on the outer side of the tip of the flap 25. The inner protrusion 24 has a truncated cone shape. The height of the inner protruding portion 24 is 5 mm, which is equivalent to the height of the outer peripheral protruding portion 23. The shape of the inner protrusion 24 is not limited to the conical trapezoidal shape, and may be another shape such as a cylindrical shape, a quadrangular prism shape, or a hemispherical shape. Further, the height of the inner protruding portion 24 does not necessarily have to be the same as the height of the outer peripheral protruding portion 23, and if the covering member 40 and the ventilation portion 22 can be prevented from coming into close contact with each other, the height is higher than the height of the outer peripheral protruding portion 23. It may be low or low. Further, the number, position, and size of the inner protrusions 24 are not limited to the present embodiment.

The covering member 40 of the first embodiment shown in FIG. 1 has a strip shape for preventing foreign matter from entering the inside of the container during sales at a store or during transportation and preventing the lid 20 from coming off from the container body 10. It is a closed strip-shaped member in which both ends of the film are joined to each other. The covering member 40 is mounted in parallel with the straight line L1 of FIG. 2, and covers at least the entire outer peripheral protrusion. Therefore, the width dimension of the covering member 40 is, for example, 60 mm.

Next, the effects of the lid 20 and the container 1 with a lid shown in FIG. 1 will be described. FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG. FIG. 4A is a diagram not including the covering member 40, and FIG. 4B is a diagram including the covering member 40. FIG. 5 is a cross-sectional view taken along the line VV in FIG. FIG. 5A is a diagram not including the covering member 40, and FIG. 5B is a diagram including the covering member 40.

According to the lid 20 and the container with a lid 1, as shown in FIGS. 4 and 5, the covering member 40 is located at a position away from the upper surface 21 by the outer peripheral protrusion 23 and the inner protrusion 24 around the ventilation portion 22. Since it is lifted and supported, a flow path connected to the ventilation portion 22 can be secured.

FIG. 6A is a diagram schematically showing an aspect of cooking in a microwave oven using the container 1 with a lid of Example 1. During heating, as shown in FIG. 6A, steam can be discharged to the outside of the outer peripheral protruding portion 23 via the internal / external distribution portion 29. The steam discharged to the outside is discharged to the outside in the width direction of the covering member 40.

When the cooking is completed and the container 1 with a lid is taken out from the microwave oven, the air and steam in the container are rapidly cooled and the volume is reduced, so that the inside of the container is depressurized. As shown in (b), outside air flows in through the inside / outside distribution unit 29. At this time, the covering member 40 tends to be attracted to the ventilation portion 22, but since the covering member 40 is supported by the outer peripheral protruding portion 23 and the inner protruding portion 24 at a height away from the surface of the lid 20. Does not stick to the surface of the lid 20. Therefore, the covering member 40 does not block the ventilation portion 22, and a space can be surely secured around the ventilation portion 22, so that the inflow of outside air into the lidded container 1 after the completion of cooking is not hindered. Therefore, deformation of the container body 10 and the lid 20 can be suppressed.

As shown in FIG. 6B, since the internal / external distribution section 29 and the ventilation section 22 are preferably opened in the direction along the circumferential direction of the covering member 40, foreign matter is formed through the gap between the lid 20 and the end portion of the covering member 40. Even if it enters, it does not reach the ventilation part 22 directly. Therefore, it is difficult for foreign matter to enter the container 1 with a lid.

Further, since the ventilation portion 22 is configured to have the flap 25, as shown in FIGS. 4 and 5, when the flap 25 is opened, the opening of the ventilation portion 22 becomes larger, and a wider steam can be used. A flow path is secured.

Further, since the inner protruding portion 24 is formed on the outer side of the tip of the flap 25, as shown in FIG. 4 (b), the flow path is formed in the vicinity of the tip of the flap 25 having the largest opening in the ventilation portion 22. Since it can be secured, efficient steam distribution becomes possible.

As described above, according to the lid 20 and the container with a lid 1 according to the present embodiment, the steam is satisfactorily discharged during heating, and the inflow of outside air into the container is not hindered after the cooking is completed. That is, the steam can be satisfactorily circulated in both the heating state and the post-heating state.

Actually, when a commercially available miso ramen was housed in the container 1 with a lid having the configuration of the present embodiment and heated as described in the food labeling in a microwave oven, the container was not deformed and the contents did not flow out. confirmed.

<Modification example>
Although the embodiment for carrying out the present invention has been described above, the present invention is not limited to the above-described embodiment, and the material, shape, size and the like can be appropriately changed without departing from the spirit of the present invention. is there. Hereinafter, changes in the embodiment of the present invention will be described with reference to the drawings of the modified examples of the first embodiment of the lid and the container with a lid of the present invention. Modified examples are also examples of embodiments of the present invention, but the present invention is not limited to these modified examples.

<Modification example 1>
The configuration of the lid 20a according to the modified example 1 in which the design of the first embodiment is further modified will be described with reference to FIGS. 7 to 9. In the lid 20a shown in FIG. 7, which is a modification 1, the configuration of the internal / external distribution unit 29a is different from that of the embodiment of the internal / external distribution unit 29. The internal / external distribution portion 29a is configured by forming a second ridge portion 30 having a high protruding height in a part of the outer peripheral protruding portion. An inclined portion 32 is formed between the second ridge portion 30 and the other normal ridge portion 31 having a normal height, and the second ridge portion 30 and the normal ridge portion 31 are connected to each other. It is provided as follows. When the covering member 40 is laid on such an outer peripheral protruding portion 23, the end portion of the second ridge portion 30 and the corner portion of the normal ridge portion 31 on the side on which the second ridge portion 30 is formed are formed. The covering member 40 is stretched linearly between them. As a result, a triangular gap is formed normally surrounded by the ridgeline portion of the ridge portion 31, the ridgeline portion of the inclined portion 32, and the covering member 40, and this gap becomes the internal / external distribution portion 29a (FIGS. 8 and 9). reference). Since the other configurations are the same as those in the above-described embodiment, the same reference numerals are given and the description thereof will be omitted.

According to such an internal / external distribution unit 29a, as shown in FIGS. 9 (a) and 9 (b), flow paths are formed on both sides of the second ridge portion 30, which facilitates the flow of steam and improves efficiency. Steam can be distributed. In the present embodiment, since the inclined portion 32 is provided, the mold can be easily released during the molding process, and the lid 20a is less likely to be damaged. On the other hand, if the inclined portion 32 is omitted, the area of the gap can be increased, so that the distribution efficiency can be improved.

<Modification 2>
For example, in the first modification, the internal / external distribution portion 29a is formed between the second ridge portion 30 having a high protrusion height and the corner portion of the normal ridge portion 31, but the present invention is not limited to this. As in the lid 20b shown in FIG. 10A, which is the second modification, the ridge 33 having a low protrusion height may be formed instead of the second ridge 30 of the first modification. According to the outer peripheral protruding portion 23b having such a configuration, a gap surrounded by the top edge portion of the low ridge portion 33 and the covering member (not shown) is formed, and this gap becomes the internal / external distribution portion 29b.

In addition, the shapes of the ventilation portion 22, the outer peripheral protrusion 23, and the inner protrusion 24 can be appropriately redesigned. Hereinafter, the configuration of the lid whose design has been changed for each part will be described as modification 3 to 15.

<Modification example 3>
The lid 20c shown in FIG. 10B, which is a modified example 3, is an example in which the outer peripheral protrusions 23c are formed by arranging the island-shaped protrusions 34 at intervals. The island-shaped protrusion 34 has a truncated cone shape and is arranged in a rectangular shape in a plan view to form an outer peripheral protrusion as a whole. Since the other configurations are the same as those of the lid 20 shown in FIG. 3, the same reference numerals are given and the description thereof will be omitted. According to such a configuration, since the internal / external distribution portions 29c are formed between the adjacent island-shaped protrusions 34 and 34, a large number of internal / external distribution portions 29c are formed. Therefore, the flow efficiency of steam inside and outside the outer peripheral protrusion 23c is very high.

<Modification example 4>
In the lid 20d shown in FIG. 10C, which is a modification 4, the ventilation portion 22d is composed of a group of micropores composed of a plurality of micropores 35, 35. This group of micropores can be formed by punching or laser machining. The inner protruding portion 24 is arranged at the center of the portion surrounded by the outer peripheral protruding portion 23. The micropores 35, 35 have a circular shape and are arranged so as to surround the central inner protrusion 24. The micropores 35, 35 may be elliptical. The ventilation portion composed of the fine pore group as in the modified example 4 is effective in suppressing the contamination of foreign matter, and the steam can be efficiently flowed by optimizing the number of pores.

<Modification 5>
In the lid 20e shown in FIG. 10D, which is a modification 5, an external ridge 36 is formed on the outside of the internal / external distribution section 29. The outer ridge 36 has a cross-sectional shape equivalent to that of the outer peripheral protrusion 23, and has a shape longer than the opening width of the inner / outer distribution portion 29. The external ridge 36 is formed at a position away from the outer peripheral protrusion 23. The separation distance between the external ridge 36 and the outer peripheral protrusion 23 is set to a length that allows steam to flow satisfactorily. According to such a configuration, the covering member is also supported by the outer ridge 36 and the outer peripheral protrusion 23 on the outside of the inner / outer distribution portion 29. Further, by providing the external ridge 36, the probability of preventing foreign matter from being mixed can be further increased.

<Modification 6>
In the lid 20f shown in FIG. 11A, which is a modification 6, the flaps 25 forming the ventilation portion 22f, and the tip portions of the four flaps 25, 25 ... It faces the central part of the part surrounded by 23. An inner protruding portion 24 is formed in the central portion of the portion surrounded by the outer peripheral protruding portion 23.

<Modification 7>
In the lid 20g shown in FIG. 11B, which is a modification 7, a truncated cone-shaped inner protrusion 24g is provided in place of the truncated cone-shaped inner protrusion 24 of the lid 20g.

<Modification 8>
In the lid 20h shown in FIG. 11C, which is a modification 8, a cross-shaped inner protrusion 24h in a plan view is provided in place of the inner protrusion 24g of the lid 20g. According to such a configuration, the probability that the covering member closes the ventilation portion 22h can be further reduced. Further, since the inner protruding portion 24h is formed in the vicinity of the tip portion of the flap 25, a steam flow path can be secured. In the modified example 8, in particular, by using the cross-shaped inward protruding portion 24h, the flow of steam from the ventilation portion 22h can be guided to the internal / external distribution portion 29.

<Modification example 9>
In the lid 20i shown in FIG. 11D, which is a modification 9, three flaps 25 forming the ventilation portion 22i are provided, and are formed radially at a pitch of 120 degrees. The tips of the three flaps 25, 25, 25 face the central portion of the portion surrounded by the outer peripheral protrusions 23. An inner protruding portion 24 is formed in the central portion inside the outer peripheral protruding portion 23. According to such a configuration, the flow path area of the ventilation portion 22j becomes large as in the case of the lid 20g, so that the flow efficiency of steam inside and outside the container becomes high. Further, since the inner protruding portion 24 is formed in the vicinity of the tip portion of the flap 25, a flow path can be secured.

<Modification example 10>
The lid 20j shown in FIG. 11E, which is a modified example 10, is provided with two flaps 25 forming the ventilation portion 22j. The two flaps 25 and 25 are arranged in parallel in the width direction of the covering member, the tip of one flap 25 faces the inside / outside distribution portion 29 side, and the tip of the other flap 25 is. It faces the other side of the internal / external distribution section 29. An inward protruding portion 24 is formed in the vicinity of the tip portion of each flap 25. According to such a configuration, in addition to obtaining the same action and effect as the lid 20 g, the tips of the two flaps 25 are directed to the separate inner and outer distribution parts 29, so that the flow of discharged steam It is possible to distribute steam even more efficiently without colliding with each other.

<Modification 11>
In the lid 20k shown in FIG. 12A, which is a modified example 11, the inner protruding portion 24k has an arc shape that follows the shape of the tip portion of the flap 25. According to such a configuration, in addition to obtaining the same action and effect as the lid 20, if a foreign substance should enter the inside of the outer peripheral protrusion 23, it can be blocked by the inner protrusion 24k, and the ventilation portion can be obtained. It is possible to prevent foreign matter from entering the inside of the container from 22.

<Modification example 12>
In the lid 20m shown in FIG. 12B, which is a modification 12, the ventilation portion 22m is composed of a group of micropores consisting of a plurality of micropores 35m, 35m, etc. provided by performing laser processing. .. The micropores 35 m have an elliptical shape and are arranged in a cross shape in a plan view. The inner protruding portions 24 are provided at four locations, and are arranged in the vicinity of the four corners of the portion surrounded by the outer peripheral protruding portions 23, respectively. According to such a configuration, since the ventilation portion 22 m is formed over a wide area, steam can be circulated more efficiently, and the inner protrusions provided at the four locations provide a covering member. Is also highly effective in preventing the phenomenon of blocking the ventilation part.

<Modification example 13>
In the lid 20n shown in FIG. 12C, which is a modified example 13, the flaps 25 forming the ventilation portion 22n, and the tip portions of the four flaps 25, 25 ... It faces the central part of the part surrounded by 23. Two inner protruding portions 24 are formed side by side in the central portion inside the outer peripheral protruding portion 23.

<Modification 14>
In the lid 20o shown in FIG. 12D, which is a modified example 14, instead of the inner protruding portion 24n of the lid 20n, an inward protruding portion 24o having an oval trapezoidal shape at the top is provided. According to such a configuration, since the area of the inner protruding portion is increased, the phenomenon that the covering member blocks the ventilation portion can be more effectively prevented.

<Modification 15>
In the lid 20p shown in FIG. 12E, which is a modification 15, two flaps 25p forming the ventilation portion 22p are provided. The two flaps 25p and 25p are formed by making an S-shaped notch in a plan view with a blade on the upper surface 21. The two flaps 25p and 25p are adjacent to each other side by side in the width direction of the covering member. The tip of one flap 25p faces the one side of the internal / external distribution section 29, and the tip of the other flap 25p faces the other side of the internal / external distribution section 29. An inner protruding portion 24 is formed in the vicinity of the tip portion of each flap 25p. According to such a configuration, in addition to obtaining the same action and effect as the lid 20j of the modified example 10, since the two flaps 25p and 25p are connected, the cut length forming the ventilation portion 22p can be reduced. While minimizing the decrease in the strength of the lid, the opening area of the ventilation portion can be maintained.

1 Container with lid 10 Container body 20 Lid 21 Top surface of lid 20 22 Ventilation part 23 Outer peripheral protrusion 24 Inner protrusion 25 Flap 26 Lid 20 fitting part 28 Continuous protrusion 29 Inner / outer flow part 40 Covering member

Claims (6)

A lid in a container with a lid for microwave-heated foods, which comprises a container body, a lid fitted in an upper opening of the container body, and a covering member covering at least a part of the surface of the lid.
The lid has a ventilation portion that ventilates the inside and outside of the container with a lid, an outer peripheral protrusion that is located around the ventilation portion and is formed so as to project outward from the surface of the lid and the outer circumference protrusion. It is provided with an inner protruding portion that is located inside the portion and is formed so as to project outward from the surface of the lid to the outside of the container with a lid.
A lid characterized in that at least an inner portion surrounded by the outer peripheral protrusion is covered with the covering member. The outer peripheral protrusion is surrounded by the surface of the lid, the outer peripheral protrusion, and the covering member under a state in which the covering member covers at least the entire surface of the projection shape formed by the outer peripheral protrusion. The lid according to claim 1, further comprising an internal / external distribution section that enables the flow of gas or liquid inside and outside the space portion. The vent has a flap and
The lid according to claim 1 or 2, wherein the inner protrusion is formed on the outer side of the tip of the flap. The lid according to claim 1 or 2, wherein the ventilation portion is composed of a group of micropores composed of a plurality of micropores. The lid according to any one of claims 1 to 4, wherein the ventilation portion is formed so as to surround the inner protruding portion. A container with a lid for microwave-heated foods
A container body, a lid fitted to the upper opening of the container body, and a covering member covering at least a part of the surface of the lid are provided.
The lid has a ventilation portion that ventilates the inside and outside of the container with a lid, an outer peripheral protrusion that is located around the ventilation portion and is formed so as to project outward from the surface of the lid and the outer circumference. It is provided with an inner protruding portion that is located inside the protruding portion and is formed so as to project outward from the surface of the lid to the outside of the container with a lid.
A container with a lid, wherein the covering member is mounted so as to cover at least the entire inner portion surrounded by the outer peripheral protrusion.

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