JP2021142987A - Paper container with lid for microwave heating food product - Google Patents

Abstract

To provide an advantageous paper container with a lid for microwave heating food product in which a paper container main body and a lid body are inner-fitted to appropriately close the lid body, an adhesion of the paper container and the lid body is high, leakage of steam from a fitting portion during heating in particular can be suppressed as much as possible, usability is excellent, and use and function of conventional paper containers are enhanced.SOLUTION: A paper container with a lid for microwave heating food product includes an outer wound edge part 22 in an upper opening 21, and includes a lid body 30 that includes a paper container main body 20 in which a concave groove-shaped fitting part 40 that circulates an inner periphery wall portion 24a close to the outer wound edge part of the upper opening in parallel with the outer wound edge part of the upper opening, a lid surface portion 31 that covers the upper opening and includes a steam hole 32 for discharging steam in the container main body, a lid flange portion 34 abutting on an edge part of the upper opening, and a hanging portion 35 that is interposed between the lid surface portion and the lid flange portion and is circumferentially provided so as to enter the upper opening, and in which the lid flange portion is extended from an upper end to an outer side of the hanging portion and a convex fitting portion 50 fitted to the concave groove-shaped fitting part when closing the lid to an outer periphery portion 35 of the hanging portion is formed.SELECTED DRAWING: Figure 5

Description

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

Cooked foods sold at retail stores such as convenience stores are stored in single-use containers used for one-time use such as display and sale, and are cooked in a microwave oven as they are at the time of purchase or after taking them home. Is possible. Then, after cooking, the food contained as it is is eaten from the container. Since this type of cooked food container is a single-use container, it is generally a molded product of a synthetic resin sheet having a lid fitting structure that is as simple as possible.

For example, foods such as rice bowls and noodles contain a relatively large amount of water, so the inner fitting lid in which the fitting portion of the lid is brought into close contact with the inner peripheral wall of the upper opening of the container body made of heat-resistant resin. A container is used (see, for example, Patent Document 1). In the container with a lid for inner fitting, the inner peripheral wall portion of the upper opening of the resin container body is formed in an inverted tapered shape, and the fitting portion of the lid body has a protruding shape corresponding to the inner peripheral wall portion having an inverted tapered shape. By being formed and the protruding lid fitting portion is deeply fitted into the inner peripheral wall portion of the container having an inverted taper shape, the adhesion between the two can be obtained.

On the other hand, for food containers for cooking in a microwave oven such as gratin and doria, a paper container body has been conventionally used, and the depth is lower than the flat shape for convenience of eating. It is formed in a dish shape or a shallow cylinder shape. In this type of paper container, thick paperboard is wound in a circumferential shape to form the body of the container body, and the upper part is wound outward to form an outer winding opening edge, and the lower part is folded inward to form a bottom plate. Combines with to form the bottom.

However, in this type of paper container body, the inner peripheral wall surface of the upper opening becomes a smooth surface of the paperboard, and special molding for internal fitting such as a reverse taper shape like the above-mentioned resin container cannot be performed. When closing the lid, the peripheral wall portion extending downward from the outer peripheral edge of the lid surface of the lid body is adhered to the outer winding edge of the container body from the outside, and the peripheral wall portion of the lid body is attached to the container body. This is done by an outer fit that locks to the underside of the outer winding edge.

By the way, in a paper container such as gratin, since the food content is large and contains a large amount of water, it takes a relatively long heating time to heat the food in a microwave oven. When this is done, steam is generated inside the container, and the lid is provided with a steam hole for discharging the steam inside the container. However, since the conventional paper container is closed by outer fitting, the adhesion between the container body and the lid becomes loose due to the pressure due to heating and the deformation of the container, and the outer circumference of the lid becomes loose. Steam may leak from the portion, and the vicinity of the outer fitting portion between the container body and the lid may be heated by the steam. Therefore, when a finger is put on the edge of the container body to take out and carry the container after cooking, there is a problem that the container is hot and difficult to hold and handle.

In particular, a molded product of a synthetic resin sheet is often used as the lid from the viewpoint of moldability, and when the lid is externally fitted to the outside of the outer winding edge of the opening of the paper container body, Difference in deformation characteristics during heating due to the difference in materials between the two, that is, the paper container body can be partially deformed, is relatively rigid as a whole, and the amount of deformation is small (especially in containers such as gratin and doria, the peripheral wall On the other hand, the resin lid has the flexibility that the whole deformation occurs more easily than the partial deformation (especially in the lid such as Gratan and Doria). On the other hand, since the width of the peripheral wall is small, the deformation of the peripheral wall portion to be externally fitted is large), so that the peripheral wall portion of the lid is located on the outside of the container body. I hate it.

Japanese Unexamined Patent Publication No. 2019-127301

The present invention has been made in view of these points, and in a microwave-heated food container provided with a paper container body, the lid body is appropriately closed only by internally fitting the paper container body and the lid body. It can be covered, and the adhesion between the paper container body and the lid is high. Especially, the leakage of steam from the fitting part during heating can be suppressed as much as possible, and it is easy to use. Provided is an advantageous microwave-heated food paper container with a lid, which can greatly enhance applications and functions.

That is, the invention of claim 1 is made of paper or a material mainly composed of paper or plant fiber, has an outer winding edge portion at the upper opening, and has an inner peripheral wall portion near the outer winding edge portion of the upper opening. A paper container body in which a concave groove-shaped fitting portion that circulates in parallel with the outer winding edge portion of the upper opening is formed, and the upper opening of the paper container body is covered and the inside of the paper container body is covered. The lid surface portion having a steam hole for discharging steam, the lid flange portion abutting on the edge portion of the upper opening of the paper container body, and the paper product sandwiched between the lid surface portion and the lid flange portion. It has a hanging portion that is peripherally provided so as to enter the upper opening of the container body, and the lid flange portion extends outward from the upper end of the hanging portion and is formed on the outer peripheral portion of the hanging portion. The present invention relates to a paper container with a lid for microwave-heated foods, which comprises a lid having a convex fitting portion formed to be fitted to the concave groove-shaped fitting portion when the lid is closed.

The invention of claim 2 relates to the paper container with a lid for microwave-heated food according to claim 1, wherein the lid is made of a synthetic resin sheet molded product.

The invention of claim 3 relates to the paper heat-resistant container with a lid for microwave-heated food according to claim 1 or 2, wherein the paper container body has a deep dish shape or a shallow cylinder shape to be used for eating. ..

The invention according to claim 4 is made of paper with a lid for microwave-heated food according to claim 3, wherein the maximum diameter of the paper container body is 25 cm or less, and the ratio of the diameter to the container height is 2 to 5. It relates to the container.

The invention of claim 5 relates to a paper container with a lid for microwave-heated food according to claim 3 or 4, wherein the container is a gratin dish or a doria dish.

According to the paper container with a lid for microwave-heated foods according to the invention of claim 1, it is made of paper or a material mainly composed of paper or plant fiber, has an outer winding edge at the upper opening, and is said to have the upper opening. A paper container body in which a concave groove-shaped fitting portion that circulates in parallel with the outer winding edge portion of the upper opening is formed on an inner peripheral wall portion near the outer winding edge portion, and the upper portion of the paper container body. A lid surface portion having a steam hole that covers the opening and discharges steam in the paper container body, a lid flange portion that abuts on the edge of the upper opening of the paper container body, and the lid surface portion and the lid flange. It has a hanging portion that is interposed between the portions and is provided so as to enter the upper opening of the paper container body, and the lid flange portion extends outward from the upper end of the hanging portion. In addition, since the outer peripheral portion of the hanging portion is provided with a lid having a convex fitting portion to be fitted to the concave groove-shaped fitting portion when the lid is closed, the lid is provided with respect to the paper container body. The body can be held in the internally fitted state, the adhesion of the fitting part is improved, and even if steam is generated inside the container by cooking in a microwave oven, the steam is discharged from the fitting part. Can be suppressed.

According to the paper container with a lid for microwave-heated foods according to the invention of claim 2, in the invention of claim 1, since the lid is made of a synthetic resin sheet molded product, the degree of freedom in the shape of the lid is large. Not only can precise molding be easily performed, but also the deformation of the convex stripe fitting part of the synthetic resin sheet lid body during heating is partially deformable in the concave groove-shaped fitting part of the paper container body and the container body. Effective adhesion can be ensured by the overall rigidity of the.

According to the paper container with a lid for microwave-heated foods according to the invention of claim 3, in the invention of claim 1 or 2, the paper container body has a deep dish shape or a shallow cylinder shape to be used for eating. Therefore, the rigidity and strength of the side wall portion of the paper container body in the circumferential direction can be further increased, and the convex strip fitting portion of the lid body with respect to the concave groove-shaped fitting portion on the side wall portion of the container body can be more reliably received. It can be pressure-welded, and the adhesion between the ridge fitting portion and the concave groove fitting portion is further improved.

According to the paper container with a lid for microwave-heated foods according to the invention of claim 4, in the invention of claim 3, the maximum diameter of the paper container body is 25 cm or less, and the ratio of the diameter to the container height is Since it is 2 to 5, it is easy to use for cooking in a microwave oven, and a more appropriate inner fitting of the container body and the lid can be performed. Adhesion is further realized and improved.

According to the paper container with a lid for microwave-heated food according to the invention of claim 5, in the invention of claim 3 or 4, since the container is a gratin dish or a doria dish, the corresponding cooked food is cooked after cooking. It will be easier to eat as it is.

It is a schematic cross-sectional view of the paper container with a lid for microwave-heated foods which concerns on one Example of this invention. It is a top view of the lid body which has a steam hole which consists of a plurality of elongated holes. It is a top view of the lid body which has a steam hole which consists of a tongue piece-shaped opening. It is a schematic cross-sectional view near the edge of the upper opening at the time of opening a paper container with a lid. It is a schematic cross-sectional view near the edge of the upper opening at the time of closing a paper container with a lid. It is a schematic cross-sectional view near the edge of the upper opening at the time of press-fitting a lid body into a paper container with a lid.

The paper container 10 with a lid for microwave-heated foods according to an embodiment of the present invention shown in FIG. 1 is a container mainly for storing cooked foods and the like, and is a paper container main body 20 and a lid. 30 and. The foods contained in the container 10 include various types of foods such as lunch boxes such as gratin, doria, curry and rice, oyakodon, beef bowl, katsudon, and Chinese bowl, and noodles such as udon, soba, ramen, and pasta. Examples include cooked foods. In particular, the container 10 can preferably contain foods having a large mass (weight), a large amount of water, and requiring a relatively long heating time in a microwave oven.

The paper container 10 with a lid containing food can be used for packaging various foods sold in stores such as convenience stores, supermarkets, department stores, restaurants, delicatessen stores, coffee shops, and service areas. It is a container used and is compatible with cooking in a microwave oven. The main expected use is a single-use container (disposable container) used for one-time use, which is called one-way or disposable. By using a single-use container, it is convenient for food hygiene management.

The paper container main body 20 is a container for accommodating cooked foods made of paper or a material mainly composed of paper or plant fiber. As the paper or the material mainly composed of paper or plant fiber constituting the paper container main body 20, conventionally known thick paperboard is used. Since the paper container body 20 is made of paper and has excellent heat resistance, it can be suitably used for cooking in a microwave oven. Further, in the paper container body 20, in order to impart water resistance, heat resistance, oil resistance, etc., a resin film such as polyethylene resin, polystyrene resin, polypropylene resin, polyester resin, etc. is applied to both inside and outside of the container. It may be laminated. The thickness of the resin film to be laminated is not particularly limited, but is, for example, about 15 to 40 μm. In the embodiment, a heat-resistant PET resin film having a thickness of 33 μm is laminated.

As shown in FIG. 1, the paper container main body 20 is provided with an outer winding edge portion 22 at the upper opening 21, and a container body portion 24 is erected from the container bottom portion 23 to the upper opening 21. The shape of the paper container body 20 is appropriately set according to the type of food to be contained. Reference numeral 28 is a bent portion of the bottom paperboard 23s constituting the bottom portion 23, and 29 is a bent portion of the body paperboard 24s constituting the body portion 24. Both bent portions 28 and 29 are coalesced to form the bottom portion 23. Will be done.

The illustrated paper container body 20 has a deep dish shape or a shallow cylinder shape whose height is smaller than the diameter of the upper opening 21. The deep dish-shaped or shallow-cylinder-shaped paper container body 20 of the embodiment is a gratin dish or a doria dish, and in addition to gratin, doria, curry rice, pasta, and oden, fluffy soup, tomyankun, bolshichi, or buoy base. It is suitable for eating cooked foods such as soups, and these foods are served as dishes as they are after cooking.

The paper container body 20 is a circular or oval container having a maximum diameter of 25 cm or less so that it can be accommodated in a normal microwave oven, and the diameter (H) with respect to the container height (H) is taken into consideration for convenience of eating. The ratio of D) is preferably in the range of 2-5. In the embodiment, there are roughly the following three sizes.
Size: Container height (H) Diameter (D) Ratio (D / H)
S: 40mm 135mm 3.38
M: 40mm 150mm 3.75
L: 40mm 160mm 4.00

The paper container main body 20 is manufactured by a known method for manufacturing a paper container. For example, the fan-shaped or strip-shaped body paperboard 24s is formed in a tubular shape to form a container body portion 24, and the upper portion of the body paperboard 24s is wound outward to form an upper opening 21 having an outer winding-shaped edge portion 22. At the same time, a container bottom portion 23 that is fused and coupled with the bent portion 28 of the circular bottom paperboard 23s is formed in the bent portion 29 at the bottom of the body paperboard 24s to obtain the paper container main body 20. The paper container body 20 is formed in a cylindrical shape in which the container body 24 is substantially vertical by making the top opening 21 and the container bottom 23 substantially the same diameter, and the top opening as in the embodiment. By making the diameter of 21 larger than that of the bottom 23 of the container, the body 24 of the container is formed into an inverted truncated cone shape having a tapered shape. The illustrated paper container body 20 is formed in an inverted truncated cone shape. The shape of the upper opening 21 and the bottom of the container 23 may be substantially elliptical. The inverted truncated cone shape is convenient for stacking and accommodating.

As shown in the figure, the paper container body 20 circulates around the inner peripheral wall portion 24a of the container body 24 near the outer winding edge portion 22 of the upper opening 21 in parallel with the outer winding edge portion 22 of the upper opening 21. The concave groove-shaped fitting portion 40 is formed. The concave groove-shaped fitting portion 40 is a portion that allows the lid body 30 described later to be internally fitted, and is formed by a known grooving device or jig after molding the paper container main body 20, and is therefore not shown. As described above, a part of the container body 24 is extruded from the inside to the outside. Therefore, the outer peripheral ridge portion 25 is formed over the entire circumference at the position corresponding to the concave groove-shaped fitting portion 40 of the outer peripheral wall portion 24b of the container body portion 24. The concave groove-shaped fitting portion 40 can be formed by pressing a predetermined position of the container body 24 from the inside of the paper container main body 20 by using an appropriate pressing device or the like.

Although not shown, the paper container body 20 may have an appropriate heat insulating portion formed on the outside. Known examples of the heat insulating portion include embossing of the container body 24 of the paper container body 20, uneven processing of the outer peripheral surface of the paper container body 20 with heat insulating ink, and winding of a sleeve with heat insulating paper such as embossed paper. Can form a container insulation structure. By providing the heat insulating portion on the outside of the paper container main body 20, it is possible to mitigate the influence of heat when the paper container main body 20 is touched after being cooked in a microwave oven.

The lid body 30 is a member that covers the upper opening 21 of the paper container main body 20, and has a lid surface portion 31, a lid collar portion 34, and a hanging portion 35 as shown in FIG. The lid 30 is preferably made of synthetic resin because it has a large degree of freedom in the shape of the lid and can be easily molded. For example, a molded product of a synthetic resin sheet is preferable from the viewpoint of mass productivity, economy, and the like. .. Examples of the synthetic resin sheet constituting the lid 30 include a sheet of a thermoplastic resin such as polyethylene, polypropylene, polystyrene, and polyethylene terephthalate, and a sheet of a thermoplastic resin of a biodegradable resin such as polylactic acid. The synthetic resin sheet is formed into various shapes including those shown in the figure by vacuum forming.

The lid surface portion 31 has a steam hole 32 that covers the upper opening 21 of the paper container main body 20 and discharges steam in the paper container main body 20. The shape of the steam hole 32 is not particularly limited as long as steam can be appropriately discharged, and the steam hole 32 is formed of an appropriate shape such as a pore, an elongated hole, or a tongue piece-shaped opening.

For example, FIG. 2 is a plan view of a lid 30A having steam holes 32a composed of a plurality of elongated holes. The steam holes 32a are formed in the concave surface portion 33 formed at an appropriate position on the lid surface portion 31, and form a group of elongated holes formed by a plurality of elongated holes. The vapor hole 32a composed of a plurality of elongated holes is preferably formed by, for example, laser processing by irradiating a laser beam. In laser processing, the steam hole 32a can be formed easily, quickly and accurately. The size of the elongated holes and the like are not particularly limited as long as the steam in the paper container main body 20 can be appropriately discharged. For example, when the steam holes 32 are a group of elongated holes, the appropriate conditions for discharging steam and suppressing foreign matter contamination are a width of 0.15 to 1.0 mm, a length of 1 to 12 mm, and a total of 0 holes. If the thickness is ³ to 100 mm 2, steam can be appropriately discharged, and foreign matter can be suppressed without providing a member or the like covering the steam holes 32 to prevent foreign matter from entering. Although not shown, pores (pore group) may be formed instead of the elongated holes (long hole group). Appropriate conditions for discharging steam in the pores (pore group) and suppressing foreign matter contamination are 0.15 to 1.0 mm in diameter, preferably 0.15 to 0.59 mm, the number of 8 to 1000, and the opening area. The total is 0.25 to 100 mm ² .

Further, FIG. 3 is a plan view of a lid 30B having a steam hole 32b formed of a tongue piece-shaped opening. The steam hole 32b is formed by a known processing device such as a punching blade. The steam hole 32b formed of a tongue piece-shaped opening is configured to be pushed up and opened by the generation of steam inside the container so that the steam is discharged. The steam hole 32b formed by the tongue piece-shaped opening can be formed inexpensively and easily. The lid 30B having the steam holes 32b is suitably used when the entire container 10 is covered with a film or the like when packaging the product.

The lid flange portion 34 is a portion that comes into contact with the edge of the upper opening 21 of the paper container body 20 over the entire circumference, and the lid body 30 excessively enters or falls into the paper container body 20 when the lid is closed. Suppress doing. The shape of the lid portion 34 is not particularly limited as long as it can come into contact with the edge of the upper opening 21 of the paper container body 20. For example, since the outer winding edge portion 22 is formed in the upper opening 21 and the upper side of the edge portion is curved, as shown in FIGS. It is preferably part 34a. The curved lid flange portion 34a improves the sense of moderation when the lid body 30 is closed. The lid collar portion 34 may be knurled if necessary.

As shown in FIGS. 4 and 5, the hanging portion 35 is a portion interposed between the lid surface portion 31 and the lid flange portion 34 so as to enter the upper opening 21 of the paper container body 20. When the lid is closed, the inner peripheral wall portion 24a in the vicinity of the upper opening 21 is brought close to or in contact with the inner peripheral wall portion 24a. The shape of the hanging portion 35 is appropriate, such as being inclined in the direction perpendicular to the lid surface portion 31 or along the inner peripheral wall portion 24a of the paper container main body 20. Further, in the hanging portion 35, a lid collar portion 34 extends from the upper end to the outside.

The hanging portion 35 is formed with a ridge fitting portion 50 that fits into the concave groove-shaped fitting portion 40 of the paper container main body 20 when the lid is closed on the outer peripheral portion 35a. The ridge fitting portion 50 is a portion that can hold the inner fitting of the lid body 30 by fitting with the concave groove-shaped fitting portion 40 of the paper container main body 20 when the lid is closed.

Conventionally, it has been difficult to close the lid body only by fitting it inside the paper container body. This is because when the container body is made of paper, the inner peripheral wall near the upper opening has to be a substantially flat surface according to normal production, and the lid is attached to this flat inner surface. This is because it was structurally difficult to fit the inside. In other words, in order to close the lid with the paper container body only by internal fitting, it is necessary to hold the hanging portion of the lid in a state of being pressed against the substantially flat inner peripheral wall of the container body. However, if the inner peripheral wall portion is a flat surface portion, the pressure contact portion is slippery and the pressure contact state is easily released by a slight vibration or impact, and the lid body comes off. In addition, when manufacturing a paper container body, it is not possible to perform precise molding like synthetic resin, and since it has the deformability peculiar to paper, it is necessary to maintain the inner fitting of the lid like synthetic resin. I can't. Therefore, when the lid is closed by internal fitting that allows the hanging portion of the lid to enter the container body, the container body and the lid are fixed by using other auxiliary fixing means such as adhesive tape. , It was necessary to add a special configuration other than internal fitting.

Therefore, in the paper container 10 of the present invention, the concave groove-shaped fitting portion 40 is formed on the inner peripheral wall portion 24a of the paper container main body 20, and the protrusion is fitted on the outer peripheral portion 35a of the hanging portion 35 of the lid body 30. By forming the portion 50, it is possible to close the lid only by internal fitting, which was not possible with the conventional paper container. Here, the preferable conditions of the concave groove fitting portion 40 and the ridge fitting portion 50 will be described in detail below.

First, the position of the concave groove fitting portion 40 is not particularly limited as long as it is formed in the vicinity of the upper opening 21 which is above the upper position of the food housed in the paper container body 20, but for example, the upper opening is limited. It is formed at a position where the distance from 21 to the upper portion of the concave groove-shaped fitting portion 40 is about 3 to 10 mm. If the groove-shaped fitting portion 40 is too close to the upper opening 21, the lid 30 may not be properly fitted inside, and if it is too far from the upper opening 21, the lid 30 may be more than necessary inside the paper container body 20. There is a problem of getting in.

Further, the ridge fitting portion 50 provided on the hanging portion 35 of the lid body 30 is appropriately set according to the position of the concave groove fitting portion 40.
Here, assuming that the lid body 30 is made of a synthetic resin sheet molded product, the lid body 30 has a large degree of freedom in shape and can be easily molded precisely, and the inner fitting structure of the present invention is used. In some cases, the deformation of the ridge fitting portion 50 of the synthetic resin sheet lid body during heating is effective due to the partial deformability of the concave groove-shaped fitting portion 40 of the paper container body 20 and the overall rigidity of the container body. Adhesion can be ensured.

That is, as described above, while the paper container body 20 can be partially deformed by the structure of the resin fiber, the entire surface is relatively rigid and the amount of deformation is small (especially in a container such as gratin or doria, the peripheral wall). Since the height of the lid is low, the side wall is rigid), and the other synthetic resin sheet lid 30 is more easily deformed than a partial one, so to speak, it has flexibility (especially gratin or). In a lid such as Doria, the width of the peripheral wall is small with respect to the lid surface, so that the peripheral wall to be fitted is greatly deformed). The difference between these two characteristics causes a defect that the lid is separated from the container body and the fitting becomes loose in the case of the above-mentioned conventional outer fitting. On the contrary, the deformation of the convex strip fitting portion 50 of the lid body is firmly received by the partial deformability of the concave groove-shaped fitting portion 40 of the container body 20 and the overall rigidity of the container body, and effective adhesion is achieved. It is an advantage that the sex can be secured.

In the paper container body 20 and the lid 30, as shown in FIGS. 1 and 4, the diameter D1 at the position of the convex strip fitting portion 50 of the lid 30 is the position of the concave groove fitting portion 40 of the paper container body 20. The diameter is larger than D2 (D1> D2). The diameter D1 at the position of the ridge fitting portion 50 of the lid 30 corresponds to the distance between the vertices (the most protruding position) of the ridge fitting portion 50. Further, the diameter D2 at the position of the concave groove-shaped fitting portion 40 of the paper container main body 20 is the inner peripheral wall portion 24c (the concave groove-shaped fitting portion 40 and the inner peripheral wall portion 24a) on the upper side of the concave groove-shaped fitting portion 40. It corresponds to the distance between the boundary parts).

Since the diameter D1 at the position of the convex groove fitting portion 50 of the lid 30 is larger than the diameter D2 at the position of the concave groove fitting portion 40 of the paper container body 20, the convex groove fitting portion 50 is made into the concave groove fitting portion. It can be properly fitted to 40. Further, when the apex of the ridge fitting portion 50 is brought into contact (pressure contact) with the apex (the most recessed position) of the concave groove fitting portion 40, the ridge fitting portion 50 and the concave groove fitting portion 40 are brought into contact with each other. Good adhesion can be obtained with and, and the fitted state can be maintained more appropriately. When the diameter D1 at the position of the ridge fitting portion 50 of the lid 30 is equal to or less than the diameter D2 at the position of the concave groove fitting portion 40 of the paper container body 20, the ridge fitting portion 50 is the concave groove fitting portion. There arises a problem that it cannot be fitted to 40. The upper limit of the diameter D1 at the position of the convex strip fitting portion 50 of the lid body 30 is an appropriate distance that can be press-fitted into the paper container main body 20 and fitted to the concave groove-shaped fitting portion 40.

Further, in the paper container main body 20 and the lid body 30, as shown in FIG. 4, the protruding length L1 of the convex strip fitting portion 50 of the lid body 30 is the concave groove-shaped fitting portion 40 of the paper container main body 20. It is configured to have a depth of L2 or more. The protruding length L1 of the ridge fitting portion 50 of the lid 30 corresponds to the distance between the outer peripheral portion 35a of the hanging portion 35 and the apex of the ridge fitting portion 50. Further, the depth L2 of the concave groove-shaped fitting portion 40 of the paper container main body 20 corresponds to the distance between the upper inner peripheral wall portion 24c of the concave groove-shaped fitting portion 40 and the apex of the concave groove-shaped fitting portion 40. do.

When the protruding length L1 of the convex groove fitting portion 50 of the lid 30 is equal to or greater than the depth L2 of the concave groove fitting portion 40 of the paper container body 20, the convex groove fitting portion 50 and the concave groove fitting portion 50 and the concave groove fitting portion 50 are fitted. The convex groove fitting portion 50 can be more reliably pressed against the concave groove fitting portion 40 at the time of fitting with the joint portion 40, and the convex groove fitting portion 50 and the concave groove fitting portion 40 can be brought into contact with each other. Adhesion is further improved. When the protruding length L1 of the convex groove fitting portion 50 of the lid 30 is less than the depth L2 of the concave groove fitting portion 40 of the paper container body 20, the convex groove fitting portion 50 and the concave groove fitting portion 50 are fitted in the concave groove shape. Sufficient adhesion may not be obtained with the portion 40. In particular, if the diameter D1 at the position of the convex strip fitting portion 50 of the lid body 30 is too small, the fitting of the paper container body 20 with the concave groove fitting portion 40 may be released and the lid body 30 may be easily disengaged.

The width and depth of the concave groove fitting portion 40 and the width and protruding length of the convex groove fitting portion 50 are such that the width of the convex groove fitting portion 50 is equal to or less than the width of the concave groove fitting portion 40 and the convex stripes. The protruding length of the fitting portion 50 is not particularly limited as long as it satisfies the depth of the concave groove-shaped fitting portion 40 or more and both can be appropriately fitted. For example, the width of the concave groove fitting portion 40 is about 1.5 to 5 mm, the depth is about 0.2 to 1.0 mm, the width of the ridge fitting portion 50 is about 1 to 4 mm, and the protruding length. Is about 0.2 to 1.0 mm. If the width and depth of the groove-shaped fitting portion 40 and the width and protrusion length of the ridge fitting portion 50 are not appropriate, the fitting may be easily released or sufficient adhesion may not be obtained. There is.

In the paper container 10, when the hanging portion 35 of the lid 30 is inserted into the upper opening of the paper container body 20 and the lid is closed, as shown in FIG. 6, the paper container body 20 At least the lower side of the inner peripheral wall portion 24a between the upper opening 21 and the concave groove-shaped fitting portion 40 is located inside the convex strip fitting portion 50 of the lid body 30. When closing the lid, the convex strip fitting portion 50 is press-fitted into the inner peripheral wall portion 24a of the paper container main body 20, and the convex strip fitting portion 50 has a concave groove shape as shown in FIG. It is fitted by reaching the fitting portion 40.

In this way, the concave groove-shaped fitting portion 40 is formed on the inner peripheral wall portion 24a of the paper container main body 20, and the convex strip fitting portion 50 is formed on the outer peripheral portion 35a of the hanging portion 35 of the lid body 30 and closed. By fitting the convex groove fitting portion 50 to the concave groove fitting portion 40 at the time of the lid, the lid 30 can be held in the inner fitting state with respect to the paper container main body 20. Therefore, the adhesion of the fitting portion between the paper container body 20 and the lid 30 is improved, and even if steam is generated inside the container by cooking in a microwave oven, the steam is discharged from the fitting portion. Can be suppressed. Therefore, steam is appropriately discharged from the steam hole 32 side of the lid 30, and the vicinity of the fitting portion is not unnecessarily heated by the steam, and a finger is put on the edge of the container body immediately after cooking. However, it is easier to handle because it is less difficult to hold due to heat.

As described above, the paper container with a lid for microwave-heated foods of the present invention can appropriately close the lid only by internal fitting. Therefore, the adhesion between the paper container body and the lid is high, and the leakage of steam from the fitting part during heating can be suppressed as much as possible, and it is easy to use. It has been possible to provide an advantageous microwave-heated food paper container with a lid that can be significantly enhanced.

10 Paper container with lid for microwave-heated food 20 Paper container body 21 Top opening 22 Outer winding edge 23 Container bottom 23s Bottom sheet paper 24 Container body 24a Inner peripheral wall 24b Outer wall 24c Concave groove fitting part Upper inner peripheral wall part 24s Body paper 25 Outer ridge 28 Bent part of bottom paper 29 Folded part of body paper 30, 30A, 30B Lid 31 Lid 32, 32a, 32b Steam hole 33 Concave 34, 34a Lid flange 35 Hanging part 35a Outer part of hanging part 40 Concave groove fitting part 50 Convex fitting part D Diameter of container body D1 Diameter at convex fitting part position D2 Diameter at concave groove fitting part position H Container height L1 Protruding length of convex strip fitting part L2 Depth of concave groove fitting part

Claims (5)

It is made of paper or a material mainly composed of paper or plant fiber, has an outer winding edge at the upper opening, and has an outer winding edge of the upper opening on the inner peripheral wall near the outer winding edge of the upper opening. A paper container body having a concave groove-shaped fitting portion that circulates in parallel with the portion,
A lid surface portion having a steam hole that covers the upper opening of the paper container body and discharges steam in the paper container body, and a lid portion that contacts the edge portion of the upper opening of the paper container body. It has a hanging portion that is interposed between the lid surface portion and the lid flange portion and is provided so as to enter the upper opening of the paper container body, and the lid flange portion is the hanging portion of the hanging portion. It is provided with a lid extending outward from the upper end and having a convex fitting portion formed on the outer peripheral portion of the hanging portion to be fitted to the concave groove-shaped fitting portion when the lid is closed. A paper container with a lid for microwave-heated foods. The paper container with a lid for microwave-heated foods according to claim 1, wherein the lid is made of a synthetic resin sheet molded product. The paper container with a lid for microwave-heated food according to claim 1 or 2, wherein the paper container main body has a deep dish shape or a shallow cylinder shape to be used for eating. The paper container with a lid for microwave-heated food according to claim 3, wherein the maximum diameter of the paper container body is 25 cm or less, and the ratio of the diameter to the container height is 2 to 5. The paper container with a lid for microwave-heated food according to claim 3 or 4, wherein the container is a gratin dish or a doria dish.

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