JP5431833B2 - Natto container - Google Patents

Description

  The present invention relates to a natto container used from the production of natto to retail sales.

  Conventionally, as a natto container for retailing and selling natto, a container formed of a synthetic resin foam sheet such as a polystyrene resin, in which a container body and a lid are integrally connected, is usually used. Used from the natto production stage.

  In the production of natto, in the natto production line dedicated to the natto manufacturer, the natto bacteria are stored in the container body of the natto container together with the steamed soy beans, so that they remain partially open or do not impair air permeability. It is carried into a fermentation room whose temperature is adjusted in a closed state where the container body and the lid are joined by heat sealing, and predetermined fermentation and aging are performed. A seasoning storage bag containing seasoning materials such as soy sauce and eggplant is put on a protective resin film on soybean or natto in the container before fermentation and ripening. It is accommodated on the film, or after the aging, it is accommodated on the resin film in the container as described above.

  Then, after aging, the lid body is closed on the container body, and a plurality of (mainly two or three) natto containers are stacked and wrapped with a tape-like film. It is transported to a retail store in a state of being packed in a cardboard box and sold side by side at the retail store. In general, since it is necessary to take air into the container during the fermentation and aging, and also during transportation, an aeration means is provided so as to maintain air permeability even in the closed state. In each household, the heat-sealed tape-like film is peeled off, the lid is further peeled off, the resin film is removed, and a seasoning material such as soy sauce or eggplant is stirred and eaten. At this time, the natto container is used as a stirring container.

  As the natto container used as described above, a foam sheet of polystyrene resin is often used because it is relatively inexpensive, and in trimming after molding, the outer shape is taken into account due to the efficiency of removal from the sheet. In general, the container has a square shape, and the storage recess of the container body is generally a flat square shape corresponding to the outer shape.

However, if the storage recess of the container body is a flat square, even when the corners are rounded, the chopstick tip hits the side wall when stirring with a seasoning such as soy sauce sauce or eggplant as a condiment It is difficult to stir and takes a long time to achieve a good texture, and the side wall may be damaged by the tip of the chopsticks. Therefore, it is desirable to form the storage recess in a flat circular shape. However, if the flat shape including the outer shape of the container body is flat, a plurality of natto containers are stacked and packed together with a tape-like film. It becomes difficult to do. Further, in the existing natto production line, it takes a change in the support members, such as rectangular buckets.

  In the natto container, in order to keep the lid closed, the lid and the flange of the container body that are only partially heat-sealed once peeled off the heat seal and opened again. Since it cannot be closed, the odor of natto inside the container body comes out after use, and there is a problem such as bad odor generated from the trash can etc. Further, such as sticky tape film and soy sauce sauce after use The debris such as the seasoning storage bag cannot be put in the container and discarded in a lump. Even in the closed state, a gap is generated between the flange portions of the container body and the lid, and air easily enters excessively, which may adversely affect the natto inside.

  In recent years, in the natto container described above, the lid is attached to the container body in a stable state, prevents excessive air from entering after aging, and the flange portion around the opening during line movement or product transportation It has been proposed to provide a rib-like convex portion that protrudes toward the lower surface side that fits inside the opening of the container main body so as to serve as a buffer and reinforcement against an impact applied to the container (Patent Document) 1).

  However, in the case of this proposed natto container, if the storage recess has a flat square shape, there is a problem that stirring when eating natto is not easy. In addition, in a state where the lid is attached, the normal fitting of the rib-like convex portion to the opening portion makes it easy for the lid to open, and the closed state cannot be stably maintained, and heat sealing is still necessary.

  Therefore, it is preferable for this type of natto container to have a flat outer shape and a flat storage recess. In addition, it is desirable to be able to stably maintain the adhesion state due to the fitting of the rib-like convex portion to the opening portion of the housing concave portion.

  Furthermore, when a plurality (two or three) of such natto containers are stacked, wrapped with a tape-like film and packaged, if the tape-like film is tensioned, the center portion of the lid of the lower container sinks. Therefore, a strong tension cannot be applied to the tape-like film, so that stable packaging cannot be performed.

  Therefore, it is desirable for this type of natto container to be able to suppress the deformation of sinking of the lid during the above-described stacked packaging.

  Furthermore, in an existing natto production line of a natto manufacturer, in a natto filling line for steamed soybeans, natto bacteria, etc., the natto container is usually placed on a conveyor and the side wall of the storage recess is made to follow the guide. However, in this case, if the storage concave portion has a flat circular shape, there is a problem that the container rotates on the conveyor, and the filling operation is hindered.

JP 2008-265780 A

  The present invention has been made in order to solve the above-mentioned problems, and it is easy to stir the internal natto, and can be closed without the need for heat sealing, and is again closed after being opened once. It is also possible to provide a natto container that can suppress the sinking deformation of the lid of the lower container when a plurality of containers are stacked and packaged, and can be stacked and packaged satisfactorily.

  Furthermore, the present invention provides a rotation at the time of conveyance by keeping the side wall of the storage concave portion along the guide even when the side wall of the storage recess is in a shape close to a plane when the natto container is conveyed by a conveyor in the natto production line. It also provides a natto container that can be regulated.

The present invention that solves the above-described problems includes a container main body in which a storage concave portion for storing natto is formed leaving a flat rectangular flange around the opening, and the container main body is connected to the container main body via a hinge portion. A natto container comprising a flat rectangular lid body, wherein the side wall of the storage recess of the container body has an upper side wall continuously extending downward from the opening and a height position close to the opening. The lid includes a step formed by bending inward from the upper side wall, and a lower side wall that is tapered from the step and extends downward to reach the bottom of the flat circular shape. A rib-like convex portion is formed at a position corresponding to the opening portion of the rib portion, and is formed in a ring shape corresponding to the opening portion and fits inside the opening portion and the upper side wall when the lid is closed. in one plant or multiple locations, expanded form outwardly to form a convex shape in the outer peripheral surface Overhang which is characterized by comprising provided.

According to the natto container of the present invention having the above-described configuration, the rib-shaped convex portion of the lid body not only serves to suppress bending and deformation of the lid body, but also forms a convex shape on the outer peripheral surface of the rib-shaped convex portion. The overhanging portion that is formed on the ribs further enhances the effect of suppressing the bending and bending deformation of the lid by the rib-like convex portion and the shape retention effect, and particularly the sinking of the lid of the lower container when stacked and packaged Deformation can be suppressed. In addition, in the state in which the rib-like convex portion of the lid is fitted to the inside of the opening and upper side wall of the housing concave portion of the container body and the lid is attached (closed state), the projecting portion is the opening. By being elastically fitted to the inner periphery of the part and the upper side wall , the closed state can be stably maintained.

  In the natto container, the opening in the storage recess of the container body has a shape in which a half on the hinge part side is a square with a rounded corner, and a half on the opposite side of the hinge part is a semicircle. And the rib-like convex portion of the lid body may have an annular shape corresponding to the opening. As a result, the volume of the lower side wall can be expanded as compared with a case where the lower side wall is merely a flat circular taper, the depth of the storage concave portion can be reduced, and a necessary amount of natto can be accommodated, and the lid body can be bent and bent and deformed. Also excellent.

  In the natto container according to the present invention, an engagement recess is formed in the vicinity of the two corners of the outer flange of the semicircular portion of the container body so as to be continuous with the opening of the storage recess. In the vicinity of the corner portion of the flange portion of the lid corresponding to this, an engaging convex portion that is continuous with the rib-shaped convex portion and fits into the engaging concave portion when the lid is closed is provided. can do. As a result, the lid can be closed with good hermeticity without using a heat seal, and in combination with the holding action of the fitting state by the protruding portion of the rib-shaped convex portion, the lid is closed again after being opened once. Can be retained.

  In the natto container, the projecting portions of the rib-shaped convex portions may be formed at a plurality of locations in an arrangement that does not exist at the 180-degree symmetrical positions of the annular rib-shaped convex portions. This enhances the effect of suppressing the bending and deformation of the lid.

  The said natto container WHEREIN: The said protrusion part shall be provided in the part along the said hinge part of the said rib-shaped convex part, and the part along the both sides orthogonal to this hinge part. Thereby, the effect of suppressing the bending of the lid in the vertical and horizontal directions is enhanced.

  In the natto container according to the present invention, the lower side wall of the storage recess in the container body is continuous with the bottom in a wave shape in which vertical and vertical ridges are alternately continuous in the circumferential direction. Can be. As a result, the side wall strength of the storage recess is increased and the shape retention is improved, and the effect of stirring natto is enhanced.

  In the natto container, an upper portion continuous with the step portion has a shape corresponding to the shape of the opening portion, and is formed so as to gradually change from the upper portion toward the lower end side to a shape corresponding to the bottom portion. It can be. Thereby, a volume can be expanded rather than the case where a lower side wall makes a planar circular taper shape, and the depth of a storage recessed part can be made shallow and a required amount of natto can be accommodated.

  Furthermore, in the natto container, the lower side wall is bent at a predetermined height so that the upper part continuous to the stepped part is inclined more gently than the lower part continuous to the bottom part. In the portion along the side, the upper and lower bent boundary portions of the plurality of concave stripes can be formed so as to be aligned on a straight line parallel to each side. Thus, the outer surface of the bent boundary portion of the plurality of concave stripes is arranged in a straight line at the portion along the four sides of the container body. For this reason, in the natto production line, when the natto containers are transported by a conveyor, the outer surfaces of the bent boundary portions of the plurality of parallel recesses are transported along a direction regulation guide provided along the conveyor. By doing so, container rotation can be regulated.

  In the natto container, in each of the portions along the four sides, the upper and lower bent boundary portions of the three concave strips are formed so as to be aligned on a straight line parallel to the respective sides. Can do. In this case, the effect of the rotation restriction at the time of container conveyance by the conveyor is enhanced.

  The said natto container WHEREIN: The lower part of the said groove which continues to the said bending | flexion boundary part shall be formed so that it may line up on the straight line parallel to each edge | side.

  The said natto container WHEREIN: The said container main body and a cover body shall be integrally formed and provided by the vacuum forming from a synthetic resin foam sheet.

  According to the natto container of the present invention, since the lower side wall of the storage recess of the container body is continuous to the bottom of the flat circular shape, stirring when eating natto is easy, and the outer shape is a flat rectangular shape by the flange portion. Therefore, the support means such as a square bucket of the existing natto production line can be used as it is, and it is easy to stack and package a plurality of natto containers. In addition, the lid is provided with a rib-like convex portion that fits inside the opening when the lid is closed at a position corresponding to the opening of the storage recess, so that excessive air in the closed state is provided. Intrusion can be prevented.

In particular, in the case of the present invention, the rib-like convex portion of the lid is formed with a protruding portion that is outwardly extended so as to form a convex shape on the outer peripheral surface. The effect of shape retention and reinforcement by the portion is further enhanced, and thereby, bending and bending deformation of the lid can be effectively suppressed. In particular, it is possible to suppress the sinking deformation of the lid of the lower container in the case of stacking and packaging, and as a result, sufficient tension can be applied to the tape-like film, and stacking and packaging can be performed with good stability.

  Moreover, the protruding portion of the rib-like convex portion is elastically fitted to the inner surface of the opening, so that it can be closed without using a heat seal, and the closed state after the opening is maintained well. It will be possible. Therefore, problems such as the odor of natto inside the container main body being released to the outside after use are not caused. Moreover, the debris after use, such as a seasoning material storage bag, is packed in a container, and can be thrown away collectively, and a disposal process is also easy.

  Furthermore, in the present invention, the bottom side wall of the storage recess of the container main body is continuous with the bottom by forming a wave shape in which vertical and vertical ridges and ridges are alternately continuous in the circumferential direction. It is easy to stir and can be stirred well, and a natto with a good texture can be obtained.

  In addition, the upper portion continuous to the stepped portion is bent and formed at a predetermined height position so as to be inclined more gently than the lower portion continuous to the bottom portion, and a plurality of concave portions are respectively formed in the portions along the four sides of the container body. Since the upper and lower bent boundary portions of the strip are formed so as to be aligned on a straight line parallel to each side, when the natto container is transported by a conveyor in the natto production line, the plurality of the aligned multiple lines The outer surface of the bent boundary portion of the concave stripe can be used for a guide action for regulating the direction, the rotation of the container during conveyance can be regulated, and the container can be conveyed while being held in a certain direction.

It is a perspective view of the open state of the natto container concerning this invention. It is a top view of a natto container same as the above. It is sectional drawing of the III-III line of a natto container same as the above. It is sectional drawing of the IV-IV line of a natto container same as the above. It is a perspective view of the closed state of a natto container same as the above. It is sectional drawing of a natto container same as the above.

  Next, embodiments of the present invention will be described based on examples shown in the drawings.

  The natto container A of this embodiment is a container mainly formed of a synthetic resin material, and as a basic structure, has a cross-sectional concave shape opened on the upper surface, and a storage recess 2 for storing natto as a content. Is formed by leaving a flat rectangular flange 4 around the opening 3, and a lid 5 connected to one end of the container 1 via a hinge 6 so as to be opened and closed. And more. Usually, the flange part 4 of the said container main body 1 is utilized as a receiving part by the support member, arm member, etc. for a transfer in a natto production line. The hinge portion 6 is formed so that it can be bent by 180 ° by two parallel V-shaped grooves as shown in the figure, for example. Perforated intermittent cuts 61 and 62 can be formed in the valleys of the V-shaped grooves as shown in the figure.

  In the case of the figure, the container body 1 is opposite to the hinge portion 6 in that the shape of the opening 3 of the storage recess 2 is a square in which the half on the hinge portion 6 side has a rounded corner. The side half is semicircular. Reference numeral 31 denotes a rectangular portion of the opening 3, and 32 denotes a semicircular portion. A side wall 20 of the storage recess 2 is formed by an upper side wall 21 extending downward from the opening 3, and a step formed by bending inward from the upper side wall 21 at a height position close to the opening 3. Part 22 and a lower side wall 23 that extends downward from the step part 22 and continues to a bottom part 24 that has a substantially circular shape. The lower side wall 23 is inclined in a tapered shape with a smaller diameter toward the lower side. It continues to the flat circular bottom 24.

  In the case of this embodiment, the lower side wall 23 has an upper portion continuous with the step portion 22 corresponding to the shape of the opening 3, and corresponds to a flat circular bottom portion 24 from the upper portion toward the lower end side. It is formed so as to gradually change to the shape to be. That is, the step 22 connected to the upper side wall 21 of the storage recess 2 extends inwardly to the same extent over the entire circumference, and the lower side wall 23 continuous from the step 22 has a circular shape corresponding to the bottom 24 on the lower end side. It has become. In particular, in the case shown in the figure, the corner portion of the rectangular portion 31 on the hinge portion 6 side of the opening 3 is made round so that the lower side wall 23 is formed as described above so as not to hinder the natto stirring operation with chopsticks. Has been. As a result, the volume of the storage recess 2, particularly the volume of the lower side wall 23, can be expanded, and the storage recess 2 can be made shallow to store a required amount of natto.

  The lower side wall 23 is convex and concave on the inner peripheral side over the entire circumference (reversely concave and convex on the outer peripheral side). The vertical ridges 25a and the concave ridges 25b are alternately arranged in the circumferential direction. It has a wave shape mainly formed of a curved surface. Each of the ridges 25a and the ridges 25b is curved and is continuous with the bottom 24. Thereby, the accommodation recessed part 2 can be reinforced and shape-retaining property can be improved, and also the stirring effect of the stored natto can be heightened so that it may mention later.

  Further, the lower side wall 23 is bent at a predetermined height position so that the upper portion 23a continuous with the step portion 22 is inclined more gently than the lower portion 23b continuous with the bottom portion 24, and each of the four sides of the container body 1 is provided. In the portion along the side, the upper and lower bent boundary portions 26 of the plurality of concave ridges 25b that are convex on the outer peripheral side are arranged on a straight line L (chain line in FIG. 2) parallel to each side, that is, The outer surface of the bent boundary portion 26 is formed so as to be aligned on a straight line L, and when the natto container is conveyed by a conveyor in the natto production line, the outer surface of the bent boundary portion of the plurality of parallel grooves is used as a conveyor. The container rotation can be regulated by carrying it along the guide for regulating the direction along it.

  In the case of the figure, at the portions along the four sides of the container body 1, the upper and lower bent boundary portions 26 of the three concave strips 25 b are formed so as to be aligned on a straight line L parallel to the sides. Yes.

  The plurality of concave stripes 25b arranged on the straight line L may be formed so that only the bent boundary portion 26 is arranged on the straight line. As described above, it is preferable that the entire lower part continuing downward from the bent boundary portion 26 is arranged on a straight line parallel to each side in order to carry along the direction regulating guide.

  The waveform of the ridges 25a and the ridges 25b of the lower side wall 23 may be a triangular wave shape. However, from the viewpoint of stirring operability with chopsticks, a wave shape with a smooth curved surface as shown in the figure is used. An eggplant is preferred. In addition, the inner and outer amplitudes of the waveforms by the ridges 25a and the recesses 25b and the pitches of the waves in the circumferential direction can be appropriately set in consideration of the stirring effect, but usually the amplitudes by the ridges 25a and the recesses 25b. Is 2 to 6 mm, preferably 3 to 4 mm, and the pitch is about 5 to 10 mm. Of course, implementation outside the above range is also possible.

  The bottom 24 is formed with a large number of convex surfaces 27 that are slightly raised in a spherical shape on the inner surface (the surface on the side of the storage recess), and in consideration of the stirring effect, for example, several mm in diameter and 0.5 to 0.5 mm in height. A large number of spherical convex surfaces 27 of about 2 mm are formed so that the stirring effect of the stored natto can be enhanced.

And the said cover 5 leaves the opening part 3 in a corresponding | compatible position with the opening part 3 of the said storage recessed part 2, leaving the flat rectangular flange part 7 corresponding to the flange part 4 of the said container main body 1 in an outer peripheral part. An annular rib-like protrusion that protrudes on the lower surface side (inner surface side) when the lid is closed and fits inside the opening 3 and the upper side wall 21 when the lid is closed as shown in the figure. A part 8 is provided. That is, the rib-like convex portion 8 has a rib shape corresponding to the shape of the opening portion 3 and is continuous in a ring shape in which a half portion on the hinge portion 6 side is a square shape and a half portion opposite to the hinge portion 6 is a semicircular shape. There is no.

  The rib-like convex portion 8 is fitted to the upper side wall 21 of the container body 1 in the closed state in which the lid body 5 is attached to the container body 1. The lower end portion is fitted to the stepped portion 22 in a state of being close to the stepped portion 22 with a slight gap, or is provided so as to fit lightly.

  When the convex portion 8 is fitted in contact with the upper side wall 21, in order to take in air necessary for fermentation and aging of natto stored in the storage concave portion 2 in a closed state, for example, the rib-shaped convex portion 8 Needle-hole-shaped ventilation holes (not shown) that have air permeability but can prevent the entry of dust and the like are provided at required locations (a plurality of locations) in the inner part. In the case where the gap is provided between the convex portion 8 and the upper side wall 21, it is not always necessary to provide pores for ventilation.

In the case of the present invention, as shown in the figure , one or a plurality of rib-shaped convex portions 8 are provided with a protruding portion 9 extended outward so as to form a convex shape on the outer peripheral surface. The overhanging portion 9 can enhance the shape retention of the lid 5 by the rib-like convex portion 8 and the effect of suppressing the bending deformation.

  The projecting portions 9 of the rib-shaped convex portions 8 are preferably provided at a plurality of locations. However, in practice, the rib-shaped convex portions 8 are not arranged at a 180-degree symmetrical position, that is, the annular shape is provided. From the standpoint of the effect of suppressing the shape retention and bending deformation, the rib-shaped convex portion 8 is provided at a plurality of locations in an arrangement that does not exist at a 180-degree symmetrical position with respect to the center O where the vertical and horizontal center lines intersect. Particularly desirable. In the case of the figure, the projecting portions 9 are provided on the rib-like convex portion 8 along the hinge portion 6 and at the portions along both sides orthogonal to the hinge portion 6, respectively. Bending deformation can be suppressed.

  As the protruding portion 9, it is possible to expand only the outer peripheral wall of the rib-like convex portion 8, but in practice, as shown in the figure, the inner peripheral wall and the outer peripheral wall of the rib-like convex portion 8 are formed. It is particularly preferable that the projecting portion 9 is formed by expanding both of them from the viewpoint of suppressing the bending and deformation of the inner portion from the rib-like convex portion of the lid 5. Further, like the protruding shape on the inner peripheral wall side of the protruding portion 9 in the portion along both sides orthogonal to the hinge portion 6, the original inner peripheral wall portion is convex in a part in the circumferential direction within the region of the protruding portion 9. It is possible to form an expansion by separating it into a plurality of parts.

  In the illustrated embodiment, in addition to the above-described configuration, the outer flange portion 4 of the semicircular portion 32 of the opening 3 of the container body 1 and the location of the flange portion 7 of the lid 5 corresponding thereto. Preferably, as shown in the figure, the flanges are formed by utilizing the space at the corners of the flanges 4 and 7 generated by making the half of the opening 3 and the rib-like convex part 8 semicircular. Engagement recesses 12 and engagement projections 52 that are fitted to each other when the lid is closed are located at locations in the vicinity of two corners adjacent to the hinges 6 on the opposite sides of the hinges 6 in the portions 4 and 7, respectively. 7 with the required width on the outer shape side remaining. The engagement concave portion 12 and the engagement convex portion 52 are fitted using the elastic force of the material, whereby the closed state can be maintained. The engaging recess 12 is formed so that the outer surface thereof is positioned on a straight line parallel to the outline of each side of the flange portion 4, and two engagement members 12 are provided by a parallel support member such as a square bucket. The outer side of the flange portion 4 can be supported by being brought into contact with the outer surface of the mating recess 12.

  In the case of the figure, the engagement recess 12 is formed continuously with the opening 3 of the storage recess 2, and the engagement protrusion 52 is formed continuously with the rib-like protrusion 8 of the lid 5. Further, the inner peripheral wall of the rib-like convex portion 8 where the engaging convex portion 52 is formed is formed to protrude slightly outward. As a result, the same bending deformation suppression effect as that of the overhanging portion 9 can be obtained at the engagement convex portion 52.

  Examples of the constituent material of the natto container A include styrene-modified polyolefin resins, polystyrene, high impact polystyrene, styrene-ethylene copolymers, styrene-maleic anhydride copolymers, styrene-acrylonitrile copolymers, and other polystyrene series. Various synthetic resin sheets such as a resin, a polyolefin resin such as polyethylene, polypropylene, and an ethylene-vinyl acetate copolymer, and a polyester resin such as polyethylene terephthalate can be used. In particular, from the viewpoint of heat insulation and cooling effect in use, the above-mentioned synthetic resin foam sheet, among them, a polystyrene resin foam sheet and a polypropylene resin foam sheet, which are relatively rigid and have good shape retention, are preferred. The container body 1 and the lid body 5 are integrally molded from the foamed sheet via the hinge portion 6 by means of thermoforming processing such as vacuum forming.

  The foaming ratio and thickness of the foamed sheet vary depending on the material, but in the case of a polystyrene resin foamed sheet, the foaming ratio is 3 to 25 times and the thickness is 0.5 to 5.0 mm.

  In the natto filling line in the natto production line, the natto container A described above stores steamed soybeans and natto materials such as natto bacteria in the storage recess 2 of the container body 1, and further a protective resin film (not shown) ) And a seasoning storage bag (not shown) formed by storing seasonings such as soy sauce and eggplant in a bag.

  In the natto material filling line, the natto material is filled while the natto container A is conveyed by a conveyor. At this time, the side wall 20 of the natto container A is placed along a direction-regulating guide (not shown) provided along the conveyor (not shown), and the positioning directions are combined on the conveyor. In the case of the natto container A of the present invention, on the outer surface of the upper and lower bent boundary portions 26 of the plurality of concave strips 25b formed so as to be aligned on a straight line parallel to the four sides, that is, on the outer peripheral side. By causing the outer surface of the bent boundary portion 26 of the concave strip 25b to be convex along the guide, the rotation of the container during conveyance can be regulated, and the natto container A is conveyed while being held in a certain direction. Will be able to.

  After the above filling, the lid body 5 is attached to the container body 1 as shown in FIGS. In the case of the natto container A of the illustrated embodiment, in order to attach the lid 5 to the container body 1, the lid 5 is bent at the hinge portion 6 and protrudes to the lower surface side of the lid 5 in the closed state. The rib-like convex portion 8 to be fitted is fitted inside the opening 3 of the housing concave portion 2 of the container main body 1, and the engaging convex portion 52 provided on the flange portion 7 of the lid 5 is provided on the flange portion 4 of the container main body 1. It fits into the engaging recess 12 and is held in the closed state. At this time, the protruding portion 9 is elastically fitted to the inside of the opening 3 with respect to the rib-shaped convex portion 8. Therefore, even if both flange parts 4 and 7 are not joined by a heat seal means as in the prior art, the cover can be kept closed. Of course, if necessary, the portions of the flange portions 4 and 7 can be spot-heat sealed and joined.

  Then, in the closed state, the natto container A is placed in a temperature-controlled fermentation chamber for fermentation and aging. At this time, since the rib-like convex portion 8 is fitted in the opening 3, excessive air intrusion from the opening 3 can be prevented. In addition, after fermenting and aging in an open lid state, the lid 5 can be covered by placing a resin film and a seasoning material storage bag on natto. In the natto production line, when using support means such as a square bucket, the outer side portions of the flange portions 4 and 7 can be supported and handled by the support means.

  Then, the fermentation, the natto container A, or a plurality of the natto containers A are stacked and covered with a tape-like film, which is then stored in a cardboard box and transported to a retail store. They are sold side by side at the store.

  When stacking a plurality of natto containers A, the rib-like convex portion 8 of the lid body 5 is formed with an overhanging portion 9 that is outwardly extended. The effect of suppressing bending and bending deformation is further enhanced, whereby the bending and bending deformation of the lid 5 can be effectively suppressed. Therefore, it is possible to suppress the sinking deformation of the lid of the lower container in the case of stacking and packaging, and as a result, sufficient tension can be applied to the tape-like film and stacking and packaging can be performed with good stability.

  In addition, when eating natto, the lid body 5 is opened, the resin film is removed, and a seasoning material such as soy sauce or eggplant is applied with stirring. At this time, since the lower side wall 23 of the storage recess 2 of the container body 1 is continuous with the flat bottom 24, the natto stirring operation when eating natto is relatively easy. There is no possibility of damaging the side wall 20. Further, as in the above-described embodiment, when the lower side wall 23 of the storage recess 2 has a wave shape in which the vertical ridges 25a and the ridges 25b are alternately continuous in the circumferential direction, Natto can be stirred easily and effectively, and natto with a good texture can be easily obtained.

  Further, as described above, the fitting of the rib-like convex portion 8 of the lid 8 with the opening 3 and the fitting of the engaging convex portion 52 and the engaging concave portion 12 eliminate the need for heat sealing as described above. The lid can be kept in a good state even after it has been opened once, and as a result, the odor of natto inside the container body does not come out after use and no bad odor is generated from the trash can. The debris after use, such as the seasoning material storage bag, is packed in a container and closed, and can be discarded all at once.

  A ... Natto container, L ... Straight line parallel to each side, O ... Center where vertical and horizontal center lines intersect, 1 ... Container body, 12 ... Engaging recess, 2 ... Storage recess, 20 ... Side wall, 21 ... Upper side wall, 22 ... Step part, 23 ... Lower side wall, 23a ... Upper part of lower side wall, 23b ... Lower part of lower side wall, 24 ... Bottom part, 25a ... Convex streak, 25b ... Concave streak, 26 ... Bending boundary part, 27 ... Convex surface, 3 ... Opening Part 31 ... square part 32 ... semicircular part 4 ... flange part 5 ... lid body 52 ... engagement convex part 6 ... hinge part 7 ... flange part 8 ... rib-like convex part 9 ... overhang Department.

Claims (11)

A container main body in which a storage recess for storing natto is formed around the opening leaving a flat rectangular flange, and a flat rectangular lid connected to the container main body via a hinge. A natto container,
A side wall of the storage recess of the container body, the upper side wall continuously extending downward from the opening, and a step formed by bending inward from the upper side wall at a height position close to the opening; It consists of a lower side wall that inclines in a tapered shape from the step portion and extends downward to reach the bottom of the plane circle,
A rib-like convex part is formed in the lid body at a position corresponding to the opening part of the housing concave part, forming a ring shape corresponding to the opening part, and fitting inside the opening part and the upper side wall when the lid is closed. A natto container, characterized in that a protruding portion extended outward is provided at one or a plurality of the rib-like convex portions so as to form a convex shape on the outer peripheral surface .   The opening in the storage recess of the container body has a shape in which a half on the hinge part side is a square with a rounded corner, and a half on the side opposite to the hinge part forms a semicircle, the lid The natto container according to claim 1, wherein the rib-like convex portion has a ring shape corresponding to the opening.   In the vicinity of the two corners of the outer flange portion of the semicircular portion of the container body, an engaging recess is formed continuously with the opening of the storage recess, and the corresponding corner of the flange portion of the lid body is formed. The natto container according to claim 2, wherein an engaging convex portion is provided in the vicinity of the portion, the engaging convex portion being fitted to the engaging concave portion when the lid is closed, following the rib-shaped convex portion.   The natto container according to claim 2 or 3, wherein the protruding portions of the rib-shaped convex portions are formed at a plurality of locations in an arrangement that does not exist at a 180-degree symmetrical position of the annular rib-shaped convex portions.   5. The overhang portion according to claim 1, wherein the projecting portion is provided on a portion of the rib-shaped convex portion along the hinge portion and a portion along both sides orthogonal to the hinge portion. Natto container.   The lower side wall of the said storage recessed part in a container main body makes the wave shape which the convex line and the concave line of the up-down direction continued alternately in the circumferential direction, and continues to the said bottom part. The natto container described.   The lower side wall is formed such that an upper part continuous with a step part has a shape corresponding to the shape of the opening part and gradually changes from the upper part toward a lower end side to a shape corresponding to the bottom part. The natto container as described in 6.   The lower side wall is bent at a predetermined height so that the upper part continuous to the stepped part has a gentler inclination than the lower part continuous to the bottom part, and a plurality of lower side walls are provided along the four sides of the container body. The natto container according to claim 6 or 7, wherein the upper and lower bent boundary portions of the recess are formed so as to be aligned on a straight line parallel to each side.   The natto container according to claim 8, wherein the bent boundary portions of the upper and lower portions of each of the three concave strips are formed so as to be aligned on a straight line parallel to the respective sides in a portion along each side of the four sides.   The natto container according to claim 8 or 9, wherein a lower part of the concave line connected to the bent boundary part is formed so as to be aligned on a straight line parallel to each side.   The natto container according to any one of claims 1 to 10, wherein the container main body and the lid are integrally formed and continuously provided by vacuum forming from a synthetic resin foam sheet.

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