Paper container with inner tray

Abstract

To provide a paper container with an inner tray that can ensure excellent sealing even when the inner tray is placed on the paper container body.SOLUTION: A paper container 10 of the present invention comprises a container body 20 made of paper or a material mainly composed of paper or plant fiber, and an inner tray 30 and a lid body 40 composed mainly of a flexible synthetic resin material, wherein an inner tray body portion 32 of the inner tray 30 is press-fitted into a container opening portion 23 of the container body 20, an inner tray protrusion portion 35 is fitted to a container-side fitting portion 25 in a press-contact state, and the inner tray 30 is installed in the container opening portion 23, and a lid peripheral wall portion 42 of the lid body 40 is press-fitted into an inner tray opening portion 33 of the inner tray 30, a lid protrusion portion 45 is fitted to the inner side of the inner tray protrusion portion 35 in a press-contact state, and the lid body 40 covers the container opening portion 23 together with the inner tray opening portion 33 to close the lid.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a paper container with an inner tray, which comprises a paper container body, an inner tray and a lid body made of synthetic resin. [Background technology]

[0002] In convenience stores, fast food restaurants, food stalls, and other eating and drinking establishments, food and drink such as prepared dishes, rice bowls, salads, noodles, and soups are sold as takeout food and drink in disposable containers made of synthetic resin such as PET resin. Takeout containers have a structure that is as simple as possible for single-use containers, and use molded products made of synthetic resin sheets with a lid fitting structure in which a lid is detachably fitted into the upper opening of the container body to prevent the contents from spilling when the purchaser carries the product.

[0003] In recent years, the problem of plastic waste, such as marine plastic litter, has attracted attention, and there has been a trend toward refraining from the manufacture and use of synthetic resin products in order to reduce the environmental impact. In this type of food container, for example, the container body can be made of paper to reduce the environmental impact. In paper containers used for such food containers, the lid is generally attached to the opening edge of the container body by external fitting.

[0004] However, in paper containers, the container body is formed into a cylindrical shape by rolling a fan-shaped or strip-shaped paperboard into a circle and gluing both ends together, so it is difficult to achieve precise molding like with synthetic resin, and steps are formed at the bonded portions of both ends of the paperboard, so it is difficult to say that the molding precision is high. Therefore, when the lid is fitted onto the container body and closed, there is a problem that the sealing is often insufficient.

[0005] Therefore, a paper container has been proposed in which a lid is attached to a paper container body by internal fitting (see, for example, Patent Document 1). In this paper container, a groove-shaped fitting portion that runs parallel to the top opening is formed on the inner peripheral wall portion of the container body, and a protruding portion is formed on a hanging portion that is provided around the outer periphery of the lid surface portion of the lid. When the lid is closed, the protruding portion of the lid is pressed against the groove-shaped fitting portion of the container body to fit in. This provides a high level of sealing with respect to the paper container body.

[0006] In food containers, it is recommended to store main ingredients such as noodles, rice, etc., and side ingredients such as toppings separately depending on the type of food, such as noodles such as soba, udon, pasta, etc., or rice bowls such as beef bowl, oyakodon, katsudon, etc. When storing multiple types of ingredients separately in a container, it is preferable to use a container with an inner tray, in which an inner tray for storing side ingredients is placed in the upper opening of the container body that stores the main ingredient.

[0007] Even in this type of container with a tray, it is possible to reduce the environmental impact by using paper as the material for the container body. In this case, a tight seal is required when the container body and the tray are closed with the lid to prevent leakage of the contents stored in the container body and tray. However, in a container with a tray, the tray is placed at the top opening of the container body, and the tray is interposed between the container body and the lid, making it difficult to properly fit the lid into the container body. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Japanese Patent Publication No. 2021-175669 Summary of the Invention [Problem to be solved by the invention]

[0009] The present invention has been developed in consideration of these points, and provides a paper container with an inner tray that can ensure excellent sealing even when an inner tray is installed on the paper container body. [Means for solving the problem]

[0010] That is, the first invention is a paper container comprising a container body made of paper or a material mainly containing paper or plant fiber, and an inner tray and a lid made of a flexible synthetic resin material, wherein the container body has a container bottom on which a first content is placed, a container body part standing from the container bottom and formed in a cylindrical or inverted truncated cone shape, a container opening formed by opening at the top of the container body part, and a container-side fitting part formed in a groove shape around the inner peripheral surface of the container body part near the edge of the container opening and parallel to the container opening, and the inner tray has a container bottom on which a second content is placed, a container body part standing from the container bottom, a container opening formed by opening at the top of the container body part, and a wall surface of the container body part protruding from the inside to the outside and fitted into the container-side fitting part of the container body. the lid body has a lid surface portion that can cover the container opening of the container body together with the container opening of the center plate, a lid peripheral wall portion that is provided around the lid surface portion, and a lid protrusion portion that is formed on the lid peripheral wall portion by protruding a wall surface from the inside to the outside and can be fitted inside the center plate protrusion portion of the center plate; the paper container is characterized in that the center plate body portion of the center plate is press-fitted into the container opening of the container body and the center plate protrusion portion is fitted in a pressure-contact state against the container-side fitting portion, so that the center plate is placed in the container opening, and the lid peripheral wall portion of the lid body is press-fitted into the center plate opening of the center plate and the lid protrusion portion is fitted in a pressure-contact state against the inside of the center plate protrusion portion, so that the lid body covers the container opening together with the center plate opening and closes the lid.

[0011] The second invention relates to a paper container with an inner tray, in which, in the first invention, the relationship between the diameter (D1) at the apex position inside the container side fitting portion of the container body and the diameter (D2) at the apex position outside the inner tray protrusion portion of the inner tray is D1≦D2, and the relationship between the diameter (D3) at the apex position inside the inner tray protrusion portion of the inner tray and the diameter (D4) at the apex position outside the lid protrusion portion of the lid body is D3≦D4.

[0012] The third invention relates to a paper container with an inner tray, in which, in the first or second invention, when the lid protrusion portion of the lid body and the inner tray protrusion portion of the inner tray are fitted together, the center position of the lid protrusion portion is positioned above the center position of the inner tray protrusion portion.

[0013] A fourth invention relates to the paper container with an inner tray according to the first or second invention, wherein the thickness of the inner tray and the lid body is 0.2 to 0.6 mm.

[0014] A fifth invention relates to the paper container with an inner tray according to the third invention, wherein the thickness of the inner tray and the lid body is 0.2 to 0.6 mm. [Effects of the Invention]

[0015] According to a first aspect of the present invention, there is provided a paper container with an inner tray comprising a container body made of paper or a material mainly containing paper or plant fiber, and an inner tray and lid made of a flexible synthetic resin material, wherein the container body has a container bottom on which a first content is placed, a container body standing from the container bottom and formed in a cylindrical or inverted truncated cone shape, a container opening formed and opening at the top of the container body, and a container-side fitting portion formed in a groove shape around the inner peripheral surface of the container body near the edge of the container opening and parallel to the container opening, the inner tray has a inner tray bottom on which a second content is placed, a container body standing from the container bottom, a container opening formed and opening at the top of the container body, and an inner tray protrusion formed by protruding a wall surface of the inner tray from the inside to the outside and capable of fitting to the container-side fitting portion of the container body, and the lid has a container opening of the container body and a container-side fitting portion formed in a groove shape around the inner peripheral surface of the container body near the edge of the container opening, the inner tray has a container bottom on which a second content is placed, a container body standing from the container bottom, a container opening formed and opening at the top of the container body, and an inner tray protrusion formed by protruding a wall surface of the inner tray from the inside to the outside and capable of fitting to the container-side fitting portion of the container body, and a lid peripheral wall portion surrounding the lid surface portion, and a lid protrusion portion formed by protruding the wall surface of the lid peripheral wall portion from the inside to the outside and capable of fitting inside the center plate protrusion portion of the center plate. The paper container has a center plate body portion of the center plate pressed into the container opening of the container body, and the center plate protrusion portion is fitted in a pressure-contact state against the container-side fitting portion, so that the center plate is placed in the container opening, and the lid peripheral wall portion of the lid body is pressed into the center plate opening of the center plate, and the lid protrusion portion is fitted in a pressure-contact state against the inside of the center plate protrusion portion, so that the lid body covers and closes the container opening together with the center plate opening, thereby firmly fixing the container body, center plate, and lid body to each other and ensuring excellent sealing. Furthermore, the container can be properly detached from the lid body when opening, which prevents incorrect opening procedures.

[0016] According to the second invention, in the paper container with inner tray of the first invention, the relationship between the diameter (D1) at the vertex position inside the container side fitting portion of the container body and the diameter (D2) at the vertex position outside the inner tray protrusion portion of the inner tray is D1≦D2, and the relationship between the diameter (D3) at the vertex position inside the inner tray protrusion portion of the inner tray and the diameter (D4) at the vertex position outside the lid protrusion portion of the lid body is D3≦D4, thereby achieving higher adhesion.

[0017] According to the paper container with inner tray of the third invention, in the first or second invention, the designed center position of the lid protrusion portion of the lid body is positioned above the designed center position of the inner tray protrusion portion at the fitting position between the inner tray and the lid body, thereby achieving higher adhesion.

[0018] According to the paper container with inner tray of the fourth invention, in the first or second invention, the thickness of the inner tray and the lid body is 0.2 to 0.6 mm, so that appropriate strength can be obtained while reducing the amount of synthetic resin material used.

[0019] According to the paper container with inner tray of the fifth invention, in the third invention, the thickness of the inner tray and the lid body is 0.2 to 0.6 mm, so that appropriate strength can be obtained while reducing the amount of synthetic resin material used. [Brief explanation of the drawings]

[0020] [Figure 1] FIG. 1 is an exploded perspective view of a paper container with an inner tray according to one embodiment of the present invention. [Figure 2] FIG. 2 is a cross-sectional view of a main part of a container body. [Figure 3] FIG. [Figure 4] FIG. [Figure 5] 1 is a conceptual cross-sectional view of a main part showing the fitted state of the container body, inner tray, and lid body. [Figure 6] This is a conceptual cross-sectional view of a key part showing the design relationship between the inner tray and the lid at the fitting position. DETAILED DESCRIPTION OF THE INVENTION

[0021] The paper container 10 with inner tray according to one embodiment of the present invention shown in Figure 1 is a container capable of separately storing multiple types of storage materials (contents), and comprises a container body 20, an inner tray 30, and a lid 40. This paper container 10 can store various items such as food, miscellaneous goods, toys, and parts. In particular, the foods to be stored include cooked foods and instant foods, and are suitable for foods that can be separated into a main ingredient such as noodles or rice and side ingredients such as toppings, additives, and powdered or liquid soups, such as noodles such as soba, udon, chilled Chinese noodles, and pasta salad, and rice bowls (bento) such as oyakodon (chicken and egg rice bowl), Chinese rice bowl, and gyudon (beef bowl).

[0022] When used as a food container, for example, the paper container 10 is suitable for use in various sales formats, such as in-store sales at convenience stores, supermarkets, department stores, restaurants, food stalls, etc., buffet-style provision, catering, takeout, and home delivery services. The main anticipated use of the paper container as a food container is as a one-way, disposable, or other disposable container that can be used only once. Disposable containers are advantageous for hygienic management of food.

[0023] 1 and 2, the container body 20 is a member that contains the first contents, and has a container bottom 21, a container body 22, and a container opening 23. The first contents contained in the container body 20 are appropriate depending on the type and size of the containing material, but for example, if the contents are food, the main ingredients mentioned above are expected.

[0024] The container body 20 is made of paper or a paper material mainly made of paper or plant fibers. By using paper materials instead of conventional synthetic resin materials, it is possible to reduce the use of synthetic resin products and reduce the environmental impact. Furthermore, paper materials are relatively rigid and have excellent heat resistance, making them suitable as materials for food containers. The thickness of the paper container body 20 is set appropriately depending on the overall size, etc., but from the perspective of rigidity, for example, a thickness of approximately 0.25 to 0.5 mm is preferable.

[0025] In order to impart water resistance, heat resistance, oil resistance, etc. to the container body 20 as needed, a resin film such as a polyethylene resin, polystyrene resin, polypropylene resin, or polyester resin may be laminated on the inside or both the inside and outside of the container. The thickness of the resin film is not particularly limited, but is preferably, for example, about 15 to 40 μm. In this embodiment, a heat-resistant PET resin film with a thickness of 33 μm is laminated. Furthermore, a paper outer casing (sleeve) or the like may be wrapped around the outer periphery of the container body 20 to protect the container body 20 and impart heat resistance, etc.

[0026] The container bottom 21 is a portion on which the first content is placed and is formed in a substantially circular shape. The container body 22 stands upright from the container bottom 21 and is formed in a cylindrical or inverted truncated cone shape. The container opening 23 is a portion formed by opening at the top of the container body 22, and for example, the edge 23a is formed in an outwardly curled shape. The container body 20 configured in this manner is manufactured by a known method for manufacturing paper containers. For example, the container body 22 is formed by rolling a fan-shaped or strip-shaped paperboard into a cylindrical shape, and the upper part of the container body 22 is then wound outward to form the container opening 23 having the outwardly curled edge 23a. Next, the lower part of the container body 22 and the disk-shaped container bottom 21 are joined together to obtain the container body 20.

[0027] In this container body 20, the container bottom 21 and the container opening 23 have approximately the same diameter, so that the container body 22 is formed into a substantially vertical cylindrical shape. On the other hand, the container opening 23 has a larger diameter than the container bottom 21, so that the container body 22 is formed into a tapered inverted truncated cone shape (bowl shape). The inverted truncated cone-shaped container body 20 is highly convenient because it can be easily stacked and stored with other container bodies.

[0028] In the paper container body 20, a groove-shaped container-side fitting portion 25 is provided on the inner peripheral surface 22a of the container body 22 near the edge of the container opening 23, running parallel to the container opening 23. The container-side fitting portion 25 is formed by pressing a predetermined position on the container body 22 from the inside of the container body 20 using a known pressing device such as a grooving device or an appropriate jig after the container body 20 is formed into a cylindrical or inverted truncated cone shape. As a result, the wall surface of the container body 22 is formed into a shape that protrudes from the inside to the outside. The container-side fitting portion 25 is formed around the entire circumference of the container body 22. The groove depth of the container-side fitting portion 25 is not particularly limited, but is preferably about 0.2 to 1.0 mm, for example.

[0029] The inner tray 30 is a member for containing the second contents, and as shown in Figures 1 and 3, has an inner tray bottom 31, an inner tray body 32, an inner tray opening 33, and an inner tray ridge 35. The second contents contained in the inner tray 30 are appropriate depending on the type and size of the container, but for example, if the contents are food, the above-mentioned side ingredients are expected. The inner tray 30 is placed in the container opening 22 of the container body 20, and allows the first contents and the second contents to be contained separately within the paper container 10.

[0030] The inner tray 30 is made of a flexible synthetic resin material. Synthetic resin materials offer a high degree of freedom in the shape of molded products, facilitate precise molding down to the finest details, and are suitable for mass production and economical use, making them an ideal material for the inner tray 30. Examples of synthetic resin materials include thermoplastic resins such as polyethylene (PE), polypropylene (PP), polystyrene (PS), and polyethylene terephthalate (PET), as well as sheets of biodegradable thermoplastic resins such as polylactic acid (PLA). The inner tray 30 is formed into a predetermined shape by vacuum forming a sheet of such synthetic resin material. The thickness of the inner tray 30 is not particularly limited, but is preferably approximately 0.2 to 0.6 mm, considering the need to minimize the amount of synthetic resin used while achieving adequate strength. If the inner tray 30 is too thin, it may lack strength, while if it is too thick, it will require a large amount of synthetic resin, which is undesirable from the perspective of environmental impact.

[0031] The inner tray bottom 31 is the portion on which the second contents are placed, and is formed in a circular shape that is approximately the same shape as the container opening 23 of the container body 20. The inner tray body 32 stands upright in an approximately vertical direction from the inner tray bottom 31. The inner tray opening 33 is an opening formed at the top of the inner tray body 32, and is formed, for example, in the shape of a flange with its edge extending outward. If necessary, the inner tray opening 33 may be formed with an inner tray protrusion 34 to make it easier to remove (dismount) the inner tray 30 from the container body 20. In FIG. 1, reference numeral 36 denotes a vent hole 36 for discharging steam from the container body 20.

[0032] The inner plate protrusion 35 is a portion formed by protruding the wall surface 32a of the inner plate body 32 from the inside to the outside. As shown in Figure 5, this inner plate protrusion 35 can be fitted into the container-side fitting portion 25 of the container body 20 when the inner plate 30 is placed in the container body 20. By fitting the inner plate protrusion 35 into the container-side fitting portion 25, the inner plate 30 is firmly placed in the container body 20.

[0033] The inner plate protrusion 35 protrudes from the inside to the outside of the wall surface 32a of the inner plate body 32, forming a convex surface on the outer surface of the inner plate body 32 and a grooved surface on the inner surface. The protrusion length of the inner plate protrusion 35 is appropriate as long as it can be fitted into the container-side fitting portion 25, but is preferably approximately 0.2 to 1.0 mm, for example. The inner plate protrusion 35 may be formed partially (intermittently) around the entire circumference of the inner plate body 32, but is preferably formed along the entire circumference of the inner plate body 32 from the standpoint of adhesion to the container body 20, etc.

[0034] The lid 40, together with the inner tray 30, seals (closes) the container body 20. As shown in FIGS. 1 and 4 , the lid 40 has a lid surface 41, a lid peripheral wall 42, and a lid ridge 45. Like the inner tray 30, the lid 40 is made of a flexible synthetic resin material and is formed into a predetermined shape by vacuum forming a sheet. The synthetic resin material constituting the lid 40 may be the same as that of the inner tray 30, or a different material. The thickness of the lid 40 is not particularly limited, but is preferably approximately 0.2 to 0.6 mm, considering factors such as achieving adequate strength while minimizing the amount of synthetic resin material used. If the lid 40 is too thin, it may lack strength, while if it is too thick, the amount of synthetic resin used will increase, which is undesirable from the standpoint of environmental impact.

[0035] The lid surface portion 41 is a portion capable of covering the container opening 23 of the container body 20 together with the inner tray opening 33 of the inner tray 30. The shape of the lid surface portion 41 can be selected from appropriate shapes, such as a substantially flat planar shape, a dome shape bulging upward with an arc-shaped or trapezoidal cross section, or a drop-lid shape recessed downward. The lid surface portion 41 may be provided with a steam exhaust portion 46 for exhausting steam inside the paper container 10, as needed. The shape of the steam exhaust portion 46 is not particularly limited as long as it can appropriately exhaust steam generated inside the paper container 10, and may be formed into an appropriate shape such as a small hole, a long hole, or a slit. The steam exhaust portion 46 shown in FIG. 1 is a tongue-shaped opening formed by a known processing device such as a punching blade.

[0036] The lid peripheral wall 42 is a portion provided around the lid surface 41, and stands upright in a substantially vertical direction from the outer periphery of the lid surface 41. In the lid peripheral wall 42, for example, the edge of the upper end portion is extended outward to form a flange shape, and a lid protrusion 44 may be formed as needed to make it easier to remove (open) the lid 40 from the container body 20.

[0037] The lid protrusions 45 are formed by protruding the wall surface 42a of the lid peripheral wall 42 from the inside to the outside. As shown in FIG. 5, the lid protrusions 45 can be fitted to the inside of the inner plate protrusions 35 of the inner plate 30 when the lid is closed. By fitting the lid protrusions 45 to the inner plate protrusions 35, the lid body 40 is tightly attached to the inner plate 30, firmly sealing the container body 20. The protrusion length of the lid protrusions 45 is appropriate as long as it can be fitted to the inner plate protrusions 35, but is preferably approximately 0.2 to 1.0 mm, for example. Furthermore, the lid protrusions 45 may be formed partially (intermittently) around the entire circumference of the lid peripheral wall 42, but from the perspective of tight adhesion to the inner plate 30, it is preferable to form them around the entire circumference of the lid peripheral wall 42.

[0038] The paper container 10 of the present invention has a structure in which the inner tray 30 is fitted into the container body 20 and the lid body 40 is then placed on top of it and fitted inside, so that the lid body 40 can be fitted inside the paper container body 20 on which the inner tray 30 is installed.As shown in Figure 5, the inner tray body 32 of the inner tray 30 is pressed into the container opening 23 of the container body 20, and the inner tray protrusion portion 35 is fitted in a pressure-contact state against the container side fitting portion 25, thereby installing the inner tray 30 in the container opening 23, and the lid peripheral wall portion 42 of the lid body 40 is pressed into the inner tray opening 33 of the inner tray 30, and the lid protrusion portion 45 is fitted in a pressure-contact state against the inside of the inner tray protrusion portion 35, so that the lid body 40 covers the container opening 23 together with the inner tray opening 33 and closes the lid.

[0039] To install the inner tray 30, first, the inner tray body 32 of the inner tray 30 is inserted into the container opening 23 of the container body 20. In this process, the paper material that makes up the container body 20 is relatively rigid and resistant to deformation throughout its entire surface, while the synthetic resin material that makes up the inner tray 30 is flexible overall. As a result, when the inner tray body 32 is inserted, the inner tray ribs 35 that protrude outward from the wall surface 32a of the inner tray body 32 come into contact with the inner circumferential surface 22a of the container body 22, causing the inner tray body 32 to deform (bend) and be pressed into the container body 20. In addition, the provision of air vents 36 in the inner tray 30 allows air to escape from within the container body 20, making it easier to press the inner tray 30 into place.

[0040] When the inner tray body 32 is press-fitted so that the inner tray ridge 35 reaches the container-side fitting portion 25 of the container body 20, the inner tray ridge 35 fits into the container-side fitting portion 25, which is formed in a groove shape on the inner circumferential surface 22a of the container body 20. At this time, because the inner tray 30 is made of a flexible synthetic resin material, the inner tray body 32, which was deformed by the press-fitting, is deformed so as to return to its original shape, and the inner tray ridge 35 is pressed against the container-side fitting portion 25. In this way, by fitting the inner tray 30 made of a flexible synthetic resin into the container body 20, which is made of paper and has deformation-resistant properties, and by fitting the container-side fitting portion 25 and the inner tray ridge 35 in a pressure-fitted state, a high degree of adhesion is achieved during the internal fit, allowing the inner tray 30 to be firmly fixed to the container body 20.

[0041] Furthermore, when the inner plate 30 is fitted into the container body 20, it is preferable that the relationship between the diameter D1 at the apex position on the inside of the container-side fitting portion 25 and the diameter D2 at the apex position on the outside of the inner plate ridge portion 35 be D1≦D2. By making the diameter D2 of the inner inner plate ridge portion 35 equal to or greater than the diameter D1 of the outer container-side fitting portion 25 during this inner fitting, the force with which the inner plate ridge portion 35 is pressed against the container-side fitting portion 25 is improved, resulting in better adhesion.

[0042] Next, to close the lid 40, the lid peripheral wall 42 of the lid 40 is inserted into the inner dish opening 33 of the inner dish 30, and the lid protrusion 45 is fitted against the inside of the inner dish protrusion 35. Here, although the inner dish 30 is made of a flexible synthetic resin material, deformation is limited because it is attached to the paper container body 20. Therefore, in the lid 40, the lid protrusion 45 contacts the inner circumferential surface 32b of the inner dish body 32, and the lid peripheral wall 42 is pressed into the inner dish 30, just as when the inner dish 30 is fitted into the container body 20, and the lid protrusion 45 is fitted in a pressure-contact state against the inside of the inner dish protrusion 35. Therefore, a high degree of adhesion is achieved during the fitting, allowing the lid 40 to be firmly fixed to the inner dish 30. Furthermore, the provision of the steam exhaust section 46 in the lid 40 allows the air inside the inner tray 30 to escape, making it easier to press the lid 40 into place.

[0043] When the lid 40 is fitted into the inner plate 30, it is preferable that the relationship between the diameter D3 at the apex position on the inside of the inner plate ridge 35 and the diameter D4 at the apex position on the outside of the lid ridge 45 be D3≦D4. By making the diameter D4 of the inner lid ridge 45 equal to or greater than the diameter D3 of the outer center plate ridge 35 during this fitting, the force with which the lid ridge 45 is pressed against the center plate ridge 35 is improved, resulting in better adhesion.

[0044] Furthermore, in the paper container 10, it is preferable that, in the fitting position of the inner plate 30 and the lid 40 shown in the conceptual diagram of Figure 6, the design center position 47 of the lid protrusion 45 of the lid 40 is located above the design center position 37 of the inner plate protrusion 35. This further improves the force with which the lid protrusion 45 is pressed against the inner plate protrusion 35, resulting in even greater adhesion.

[0045] In this way, the lid 40 is overlapped and fitted internally onto the inner tray 30, which is fitted internally into the container body 20, so that it can cover and close the container opening 23 together with the inner tray opening 33 while maintaining the inner tray 30 in its installed state. Furthermore, in the paper container 10, the inner tray 30 is press-fitted and fitted internally into the container body 20, and the lid 40 is press-fitted and fitted internally into the inner tray 30, so that a high level of sealing is achieved at the fitted portions (between the container-side fitting portion 25 and the outside of the inner tray protrusion 35, and between the inside of the inner tray protrusion 35 and the lid protrusion 45). Therefore, leakage of moisture and the like can be effectively suppressed even when the contents are very moist, making it suitable as a food container.

[0046] Next, we will explain the operation of opening (opening) the paper container 10. First, when the paper container 10 is closed, the lid body 40 is fitted over the inner tray 30 that is fitted into the container body 20, so that the inner tray 30 that is fitted into the container body 20 is pressed against the container body 20 by the lid body 40.

[0047] Therefore, when the lid body 40 is removed from the inner tray 30 (opened), because the lid body 40 is made of a flexible synthetic resin, the application of a predetermined force causes the lid peripheral wall 42 to deform, releasing the engagement between the inner tray protrusion 35 and the lid protrusion 45. At this time, the lid peripheral wall 42 of the lid body 40 is deformed so as to return to its original shape, and is pulled up while being pressed against the inner peripheral surface 32b of the inner tray body 32 of the inner tray 30. Therefore, the inner tray 30 continues to be pressed against the container body 20 by the lid body 40 until the lid body 40 is removed, and the installation state relative to the container body 20 is maintained. Therefore, there is no risk of the inner tray 30 being accidentally removed from the container body 20 when the lid body 40 is opened.

[0048] When removing the synthetic resin inner plate 30 from the container body 20 after opening the lid body 40, a predetermined force is applied, as with the lid body 40, causing deformation of the inner plate body 32, disengaging the engagement between the container side fitting portion 25 and the inner plate protrusion portion 35, so that the inner plate 30 can be easily removed from the container body 20.

[0049] On the other hand, when attempting to remove the inner tray 30 with the lid closed, i.e., when attempting to remove the inner tray 30 while the lid 40 remains fitted within the inner tray 30, the inner tray 30 placed on the container body 20 is pressed toward the container body 20 by the lid 40 as described above, preventing deformation of the inner tray body 32 and maintaining the fitted state between the container-side fitting portion 25 and the inner tray protrusion 35. This makes it extremely difficult to remove the inner tray 30 with the lid closed.

[0050] In this way, with paper container 10, lid 40 can be easily removed (opened) during the opening operation, there is no risk of inner tray 30 being removed by mistake, and furthermore, it is difficult to remove inner tray 30 from container body 20 when lid 40 is fitted inside inner tray 30. Therefore, it is possible to specify that the lid 40 must be removed first as a procedure for the opening operation, and it is possible to prevent the opening operation from being performed in the wrong procedure.

[0051] As described above, the paper container with a liner of the present invention comprises a paper container body, a liner and a lid body made of flexible synthetic resin, and the liner is fitted to the container body by fitting the liner protrusion portion of the liner into the container-side fitting portion of the container body, and the lid protrusion portion of the lid is fitted inside the liner protrusion portion of the liner to fit the lid body over the liner and securely fasten the container body, ensuring excellent sealing. Furthermore, the liner and lid body fitting structure of the liner and lid body made of synthetic resin to the paper container body is easily accommodating errors in the formability of the paper, making it possible to reduce the effect of forming accuracy when closing the lid and improving the adhesion of the fitting portions.

[0052] Furthermore, the paper container with inner tray of the present invention has a structure in which the lid body is placed on top of the inner tray which is installed in the container body by internal fitting and then internally fitted to close the lid. Therefore, the inner tray 30 is pressed against the container body 20 by the lid body 40, so there is no risk of the inner tray being accidentally removed when opening, and it can be properly removed from the lid body, preventing the opening operation from being performed in the wrong order. [Industrial Applicability]

[0053] As described above, the paper container with inner tray of the present invention is a container in which the inner tray is placed inside the paper container body, and by overlapping and fitting the inner tray and lid together, it can ensure excellent sealing. This contributes to reducing environmental impact and makes it possible to appropriately store foods with high moisture content. Therefore, it is a promising alternative to conventional containers with inner trays. [Explanation of symbols]

[0054] 10 Paper container with inner tray 20 Container body 21 Bottom of container 22 Container body 22a Inner surface of the container body 23 Container opening 23a Edge 25 Container side fitting part 30 Medium Plate 31 Bottom of medium plate 32 Body of the middle plate 32a Wall of the middle plate body 32b Inner surface of the body of the inner plate 33 Inner tray opening 34 Center plate protrusion 35 Center plate protrusion 36 Ventilation holes 37 Design center position of inner plate protrusion 40 Lid 41 Lid surface part 42 Lid peripheral wall 42a Wall surface of the lid peripheral wall 44 Lid protrusion 45 Lid protrusion 46 Steam exhaust section 47 Design center position of lid protrusion D1 Diameter at the apex of the inside of the fitting part on the container side D2 Diameter at the outer apex of the inner plate protrusion D3 Diameter at the apex of the inner ridge of the inner plate D4 Diameter at the apex of the outer ridge of the lid

Claims

1. A paper container comprising a container body made of paper or a material mainly made of paper or plant fiber, and an inner tray and a lid body made of a flexible synthetic resin material, The container body has a container bottom on which a first content is placed, a container body part formed in a cylindrical or inverted truncated cone shape and extending upright from the container bottom, a container opening part formed by opening to an upper part of the container body part, and a container-side fitting part formed in a groove shape around the inner peripheral surface of the container body part near the edge of the container opening and parallel to the container opening, The inner tray has an inner tray bottom portion on which the second contents are placed, an inner tray body portion standing upright from the inner tray bottom portion, an inner tray opening formed by opening at the top of the inner tray body portion, and an inner tray protrusion portion formed by protruding a wall surface from the inside to the outside of the inner tray body portion and capable of being fitted into the container-side fitting portion of the container body, The lid body has a lid surface portion that can cover the container opening of the container body together with the inner dish opening of the inner dish, a lid peripheral wall portion that is provided around the lid surface portion, and a lid protrusion portion that is formed on the lid peripheral wall portion by protruding a wall surface from the inside to the outside and can be fitted inside the inner dish protrusion portion of the inner dish, The paper container is configured such that the center dish body of the center dish is press-fitted into the container opening of the container body, the center dish protrusion is fitted in a pressure-contact state against the container-side fitting portion, and the center dish is placed in the container opening, and the lid peripheral wall of the lid body is press-fitted into the center dish opening of the center dish, and the lid protrusion is fitted in a pressure-contact state against the inside of the center dish protrusion, and the center dish opening and the container opening are covered and closed by the lid body. A paper container with an inner tray.

2. A paper container with an inner tray as described in claim 1, wherein the relationship between the diameter (D1) at the vertex position on the inside of the container side fitting portion of the container body and the diameter (D2) at the vertex position on the outside of the inner tray protrusion portion of the inner tray is D1≦D2, and the relationship between the diameter (D3) at the vertex position on the inside of the inner tray protrusion portion of the inner tray and the diameter (D4) at the vertex position on the outside of the lid protrusion portion of the lid body is D3≦D4.

3. A paper container with an inner tray as described in claim 1 or 2, wherein the designed center position of the lid protrusion portion of the lid body is located above the designed center position of the inner tray protrusion portion at the mating position between the inner tray and the lid body.

4. The paper container with an inner tray according to claim 1 or 2, wherein the thickness of the inner tray and the lid body is 0.2 to 0.6 mm.

5. The paper container with an inner tray according to claim 3, wherein the thickness of the inner tray and the lid is 0.2 to 0.6 mm.

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