JP2013032175A - Packaging container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packaging container capable of easily holding an opening posture in an optional shape of the packaging container by reducing a force acting in a direction from the opening posture to a closing posture even though the rigidity of the paper forming the packaging container is high.SOLUTION: In the packaging container 1 suitable for housing articles such as a hamburger provided in a fast food shop or others, a container part a and a lid part b can be opened and closed via a hinge part P, the packaging container 1 is formed of the paper having mass of 210 to 310 g/m, cutouts C1 of the length of 71 to 81% of the whole length L of the hinge part P is arranged in a part excepting an end part vicinity Pa of both the sides of the hinge part P.

Description

  The present invention relates to a packaging container, and more particularly to a packaging container suitable for storing an article such as a hamburger provided in a fast food store or the like.

  As a packaging container for providing burgers and other foods at fast food restaurants, etc., a box-shaped packaging container (clamshell container) with a lid and a container that can be opened and closed via a hinge is known. It has been. As an example, Patent Document 1 discloses a packaging container that is provided with means for expanding the left and right side plates of the lid portion outward when the lid portion is closed so that the lid closing operation can be performed smoothly. FIG. 10 is a developed view showing an example of such a packaging container, and FIGS. 11 and 13 are perspective views of the packaging container assembled therefrom. FIG. 12 is a perspective view of the packaging container shown in FIG.

  As shown in FIG. 10, the packaging container 1 </ b> A includes a container part a and a lid part b, and the container part a includes a bottom plate 11, a front plate 12, left and right side plates 13 and 14, and a rear plate 15. The front plate 12 has extensions 12a and 12a on both the left and right sides, and the rear plate 15 also has extensions 15a and 15a on both the left and right sides. Similarly to the container part a, the lid part b has a top plate 21, a front plate 22, left and right side plates 23 and 24, and a rear plate 25, and the rear plate 25 has extension portions 25a and 25a on the left and right sides thereof. The left and right side plates 23, 24 have extension portions 23a, 24a on the front side thereof. The upper edge of the rear plate 15 of the container part a and the lower edge of the rear plate 25 of the lid part b are connected to each other, and this part becomes the hinge part P of the packaging container 1A after assembly.

  When assembling, the front plate 12 positioned around the bottom plate 11, the left and right side plates 13, 14 and the rear plate 15, the front plate 22 positioned around the top plate 21, the left and right side plates 23, 24 and the rear plate 25, The posture is raised with respect to the bottom plate 11 and the top plate 21. As shown in FIG. 11, in the container portion a, the left and right extensions 12 a and 12 a of the front plate 12 are bonded to the front inner surfaces of the left and right side plates 13 and 14, The extensions 15a and 15a are bonded to the rear inner surfaces of the left and right side plates 13 and 14, respectively. Thereby, the box-shaped container part a which the front plate 12, the left and right side plates 13, 14 and the rear plate 15 spread outward at an angle α is formed. As shown in FIG. 10, the angle α is an angle formed by each side edge of the front plate 12, the left and right side plates 13 and 14, and the rear plate 15 with respect to each side of the bottom plate 11.

  Further, in the lid portion b, the left and right extension portions 25a and 25a of the rear plate 25 are bonded to the rear inner surfaces of the left and right side plates 23 and 24, and the front extension portions 23a and 24 a is bonded to the inner surface of the front plate 22. Thereby, like the container part a, the box-shaped cover part b which the front board 22, the left and right side plates 23 and 24, and the rear board 25 spread outside at an angle β is formed. As shown in FIG. 10, the angle β is an angle formed by each side edge of the front plate 22, the left and right side plates 23 and 24, and the rear plate 25 with respect to each side of the top plate 21. Here, the angle α and the angle β may be the same angle. Further, the angle formed by the side edges of the front plate 12, the left and right side plates 13, 14 and the rear plate 15 with respect to each side of the bottom plate 11, the front plate 22, the left and right side plates 23, 24 with respect to each side of the top plate 21, and the rear The angles formed by the side edges of the plate 25 may be different from each other. Further, as shown in FIG. 10, the height of the front plate 22 of the lid portion b is higher than the height of the front plate 12 of the container portion a, and the heights of the left and right side plates 23 and 24 of the lid portion b are also the height of the container portion a. It is slightly higher than the height of the left and right side plates 13 and 14.

  The left and right extension portions 12a and 12a of the front plate 12 and the left and right extension portions 15a and 15a of the rear plate 15 and the left and right extension portions 25a and 25a of the rear plate 25 of the lid portion b in the container portion a described above. Adhesion of the extension portions 23a and 24a on the front side of the left and right side plates 23 and 24 is simultaneously performed using a box making machine K having a frame corresponding to the outer shape of the packaging container 1A in an open posture as shown in FIG. Done. Specifically, the packaging container 1A shown in FIG. 10 is punched out of cardboard or the like, and an adhesive is applied to the adhesive surface, and then it is put into the frame of the box making machine K. At that time, the packaging container in an open posture is placed in the frame, and the packaging container 1A is placed thereon, so that the packaging container 1A has a bottom plate 11 as shown in FIG. The front plate 12, the left and right side plates 13, 14 and the rear plate 15, the front plate 22, the left and right side plates 23, 24 and the rear plate 25, which are positioned around the top plate 21, are the bottom plate 11 and the top plate 21. Will stand up against. Then, by repeating this step, the adhesive surface of the packaging container 1A is pressed by the weight of the packaging container laminated thereon, and the adhesive surfaces of the packaging container 1A are bonded.

  In the assembled posture, it extends forward from the front plate 12 by the portions 12b, 12b of the left and right extension portions 12a, 12a and the front end portions 13b, 14b of the left and right side plates 13, 14 in the container portion a. First locking claws 13B and 14B are formed. Here, as shown in FIG. 11, the extension portions 12 a and 12 a of the front plate 12 are bonded to the extension portions 12 a and 12 a of the front plate 12 and the front side inner surfaces of the left and right side plates 13 and 14 in the container portion a. The upper edge 33 is located below the upper edges 34 of the left and right side plates 13 and 14.

  Further, notches 23c and 24c are formed below the extensions 23a and 24a of the left and right side plates 23 and 24 in the lid b, and the end portions 23b and 24a of the extensions 23a and 24a of the side plates 23 and 24 are formed. Second locking claws 23B and 24B extending left and right are formed by 24b. That is, in the packaging container 1A, first locking claws 13B, 14B extending forward from the front plate 12 above the side plates 13, 14 are formed on the side opposite to the hinge portion P of the container portion a. Second locking claws 23B and 24B extending from the lower side of the front plate 22 to the left and right are formed on the opposite side of the lid portion b from the hinge portion P.

  When the lid portion b is rotated toward the top of the container portion a with the hinge portion P as a fulcrum from the opened posture after assembly shown in FIG. 11, one of the front plate 12 and the left and right side plates 13 and 14 of the container portion a. The portion of the lid b enters the inside of the front plate 22 and the left and right side plates 23, 24, and the second locking claws 23B, 24B are the upper edges of the first locking claws 13B, 14B, respectively. It gradually moves downward as it slides on 35. When the second locking claws 23B and 24B get over the first locking claws 13B and 14B, the first locking claws 13B and 14B are notched portions 23c below the extensions 23a and 24a. , 24c. Thereby, as shown in FIG. 13, the packaging container 1A is in a closed position in which the first engaging claws 13B and 14B and the second engaging claws 23B and 24B are engaged with each other.

JP 2007-210660 A

  By the way, in the packaging container 1A described above, in an open posture as shown in FIG. 11, a tensile stress acts on the inner peripheral surfaces of the rear plates 15 and 25 of the container part a and the lid part b connected to the hinge part P. A compressive stress acts on the outer peripheral surface. Therefore, in the open posture, a repulsive force acts from the open posture to the closed posture. Therefore, in order to relax the force acting in the direction from the open posture to the closed posture and make it easier to place an article such as a hamburger on the container portion a in the open posture, the hinge portion P is attached to the outer peripheral surface of the packaging container 1A. A slight depression (not shown) is formed along the same to make it easy to maintain an open posture.

  However, for example, in a state where the hamburger bread is placed in the container portion a and the lid portion b, hamburger and vegetables are placed on the pan portion, and seasoning such as sauce is cooked. When the packaging container 1A is closed by rotating it onto the container part a via the hinge part P and a hamburger is made in the packaging container 1A, the paper forming the packaging container 1A is used. The thickness of itself is high and the rigidity is high, and the force acting from the open position to the closed position as described above becomes relatively large. Therefore, during cooking, the lid b may rotate from the open position to the closed position, and for example, a sauce may flow from a predetermined position and adhere to the packaging container 1A.

  Further, for example, the bottom plate 11 of the container part a and the top plate 21 of the lid part b have long sides that are connected to the front plates 12 and 22 and the rear plates 15 and 25 among the sides of the bottom plate 11 and the top plate 21. In the case where the sides connected to the side plates 13, 14, 23, 24 have a rectangular shape with a short side, the center of gravity of the container part a and the lid part b is relatively close to the hinge part P. Since the moment due to the gravity of the container portion a and the lid portion b with respect to the hinge portion P is smaller than the moment due to the repulsive force described above, the lid portion b is easily rotated from the open posture to the closed posture, It is difficult to smoothly store and cook articles.

  The present invention has been made in view of the above circumstances, and even if the paper forming the packaging container has high rigidity, the force acting in the direction from the open position to the closed position is relaxed, and the packaging is performed. An object of the present invention is to provide a packaging container that can easily hold an open posture in an arbitrary shape of the container.

A packaging container according to the present invention is a packaging container in which a container part and a lid part can be freely opened and closed via a hinge part, and the container part has a bottom plate, a front plate, left and right side plates, and a rear plate, The lid portion has a top plate, a front plate, left and right side plates, and a rear plate, and the hinge portion is formed by the upper edge of the rear plate of the container portion and the lower edge of the rear plate of the lid portion being continuous. In the packaging container, the packaging container is made of paper having a mass of 210 to 310 g / m ² , and a portion of the hinge part excluding the vicinity of both ends thereof has a hinge part. A cut having a length of 71 to 81% of the entire length is provided.

In the packaging container described above, when the packaging container is formed of paper having a mass of 210 to 310 g / m ² that is generally used when providing food such as a hamburger, both ends of the hinge portion By providing a cut corresponding to a length of 71 to 81% of the total length of the hinge portion in the portion excluding the vicinity of the portion, for example, when the container portion of the packaging container is horizontally arranged in an open posture, the lid portion is It is possible to effectively relieve the force to rotate in the direction of the closed posture via the hinge portion. Specifically, as shown in the following embodiment, when the length of the cut is shorter than 71% of the total length of the hinge portion, the lid portion tries to rotate in the closed posture direction via the hinge portion. Since the force to perform the operation cannot be sufficiently relaxed, the container part and the lid part are rotated via the hinge part in the operation of storing the article in the container part and the cooking operation of the article in the container part and the lid part. Work and cooking work may be hindered. Further, when the length of the cut is longer than 81% of the total length of the hinge portion, the rigidity of the hinge portion of the packaging container in the axial direction is lowered, and the hinge portion of the packaging container is deformed during box making. Therefore, there is a high possibility that the outer shape cannot be held. Therefore, as described above, by providing a cut corresponding to the length of 71 to 81% of the total length of the hinge portion in the portion excluding the vicinity of the ends on both sides of the hinge portion, while maintaining the outer shape of the packaging container, For example, an open posture of the packaging container can be easily maintained without applying a separate pressing force to the lid, and the work of storing the article in the container or the cooking of the article in the container or the lid Can be performed smoothly.

  In a preferred embodiment of the packaging container according to the present invention, the total length near the end portions on both sides is 8% or more of the total length of the hinge portion.

  In the packaging container described above, the notch is provided in a portion excluding the vicinity of the ends on both sides of the hinge portion, and the total length in the vicinity of the ends on both sides is set to 8% or more of the total length of the hinge portion. By connecting the rear plate of the container part and the rear plate of the lid part at a length of 8% or more of the total length of the hinge part in the vicinity of both ends of the part, the rigidity of the hinge part in the packaging container in the axial direction Can be effectively increased. Therefore, when making a box with the box making machine as described above, it is possible to suppress the distortion of the hinge part caused by being pressed by the frame of the box making machine, and it is possible to prevent the hinge part from cracking during box making. It can avoid effectively and can hold | maintain the external shape of the packaging container after box making reliably.

  Here, the bottom plate and the top plate of the packaging container may be square, or the side connecting the front plate and the rear plate among the sides of the bottom plate and the top plate may be a rectangle having a long side. Good.

  In another preferred embodiment of the packaging container according to the present invention, the distance between the lower edge and the upper edge of the rear plate in the container portion is d1, the angle between the bottom plate and the rear plate is θ1, and the rear plate in the lid portion When the distance between the lower edge and the upper edge is d2, and the angle between the top plate and the rear plate is θ2, d1sin θ1 = d2sin θ2.

  In the packaging container described above, the bottom plate of the container portion and the top plate of the lid portion can be placed on the same plane. Therefore, for example, it is not necessary to use a cooking table or the like provided with a predetermined level difference, and the packaging container can be placed and stored so that both the container part and the lid part are substantially horizontal on an arbitrary flat plate. The degree of freedom of work and cooking work increases, and storage work and cooking work can be performed more smoothly.

  Furthermore, in another preferred aspect of the packaging container according to the present invention, the cuts are provided in a distributed manner in the hinge portion.

  In the packaging container described above, one cut may be provided for the hinge portion, or a plurality of cuts may be provided in a distributed manner. By providing a plurality of the incisions with respect to the hinge part, the container part and the rear plate of the lid part can be connected at a desired part of the hinge part, and the rigidity of the hinge part can be further increased. . Moreover, since the length of each notch provided in the hinge portion becomes relatively short, it is possible to effectively prevent foreign matters from being mixed into the packaging container.

  According to the packaging container of the present invention, while maintaining the outer shape of the packaging container after box making, the force acting in the direction from the open position to the closed position is effectively relaxed and the open position is reliably maintained. Thus, a packaging container can be obtained that can smoothly carry out the storing operation and the cooking operation of the article.

The expanded view which shows one Embodiment of the container for packaging by this invention. The whole perspective view shown in the state which assembled and opened the packaging container shown by the expanded view in FIG. The AA arrow directional view of the packaging container shown in FIG. The whole perspective view shown in the state which assembled and closed the packaging container shown by the expanded view in FIG. The expanded view which shows other embodiment of the packaging container by this invention. The whole perspective view shown in the state which assembled and opened the packaging container shown by the expanded view in FIG. The whole perspective view shown in the state which assembled and closed the packaging container shown by the expanded view in FIG. It is the figure which showed the condition of the verification experiment, (a) is Example 1, (b) is Example 3, (c) is the figure which showed the condition of the verification experiment of the comparative example 2. FIG. The figure which showed the condition where the packaging container which made the length of the connection part near the edge part of a hinge part smaller than 13 mm was thrown into the box making machine. The development view of the conventional packaging container. The whole perspective view shown in the state which assembled and opened the packaging container shown by the expanded view in FIG. The whole perspective view which shows the state which supplied the packaging container shown by the expanded view in FIG. 10 to the box making machine. The whole perspective view shown in the state which assembled and closed the packaging container shown by the expanded view in FIG.

  Hereinafter, a description will be given based on an embodiment of the present invention with reference to the drawings.

  FIG. 1 is a developed view showing an embodiment of a packaging container according to the present invention, and FIG. 2 is an overall perspective view showing the assembled packaging container shown in FIG. 1 in an opened state. 3 is an AA arrow view of the packaging container shown in FIG. 2, and FIG. 4 is an assembled state of the packaging container shown in FIG. 1 and a closed state. It is the whole perspective view shown, and is the figure seen from the back side (hinge part side).

  The packaging container 1 shown in FIGS. 1 to 4 is mainly composed of a hinge part P and a container part a and a lid part b connected to the hinge part P with respect to the packaging container 1A described with reference to FIGS. The forms of the rear plates 15 and 25 are different, and the other members have substantially the same form. Therefore, the same members as those in the packaging container 1A are denoted by the same reference numerals and detailed description thereof is omitted, and only different points will be described in detail below.

  In the packaging container 1 of the present embodiment, as shown in FIG. 1, a cut C <b> 1 is provided in a portion excluding the vicinity of the end portions Pa on both sides of the hinge portion P. Specifically, when blanks forming the packaging container 1 are punched out of cardboard or the like with a cutting machine, a cut C1 is made in the hinge portion P with the cutting machine. Here, assuming that the total length of the hinge part P is L, the length of the cut C1 is L1, and the length of the end vicinity Pa is L2, L, L1 and L2 are represented by the following expressions (1) and (2). have.

Here, the illustrated packaging container 1 is formed of paper having a mass per unit area (basis weight) of 210 to 310 g / m ² .

  In addition, in the portion near the hinge portion P of the rear plate 25 of the lid portion b, a cut Ca that extends in the axial direction of the hinge portion P in order to reduce the rigidity of the rear plate 25 and to cancel manufacturing errors during box making. Is provided.

  When the packaging container 1 of this form is assembled and set to the open posture as shown in FIG. 2, the force acting from the open posture to the closed posture is reduced by the cut C1 provided in the hinge portion P. This open posture can be easily held. Even when the box making machine shown in FIG. 12 is used during the assembly, the rear plate 15 of the container portion a and the rear plate 25 of the lid portion b are connected in the vicinity of the end portion Pa of the hinge portion P, and the hinge The rigidity of the part P in the axial direction is ensured, and the outer shape of the packaging container 1 is maintained.

  Further, as shown in FIG. 3, in this open posture, the bottom plate 11 in the container part a and the top plate 21 in the cover part b are placed on the same plane, and both the container part a and the cover part b are horizontal. The posture can be maintained.

  Specifically, the distance between the lower edge 36 and the upper edge (hinge part P) of the rear plate 15 in the container part a is d1, the angle between the assembled bottom plate 11 and the rear plate 15 is θ1, and the lid part b is When the distance between the lower edge (hinge part) of the rear plate 25 and the upper edge 37 is d2, and the angle between the assembled top plate 21 and the rear plate 25 is θ2, these are represented by the following expression (3). have.

  In this way, the notch C1 is provided in the hinge portion P, and the bottom plate 11 and the rear plate 15 in the container portion a and the top plate 21 and the rear plate 25 in the lid portion b have the relationship shown by the above formula (3). Thus, the container part a and the lid part b can be easily held in a horizontal posture without applying a separate pressing force.

  The angle θ1 formed between the bottom plate 11 and the rear plate 15 after assembly is substantially the same as the angle α if the angle α formed between the rear edge of the bottom plate 11 and the rear edges of the side plates 13 and 14 is small. The angle θ2 formed between the top plate 21 and the rear plate 25 is substantially the same as the angle β if the angle β formed between the rear edge of the top plate 21 and the rear edges of the side plates 23 and 24 is small. Here, the angles θ1 and θ2 are generally 95 to 120 °, and preferably 98 to 112 °.

  Then, after carrying out the storing operation or the cooking operation of the article in the above-described open posture, the lid portion b is rotated around the hinge portion P, and the first engaging claws 13B, 14B and the second engaging portions are engaged. By engaging the claws 23B and 24B with each other, the packaging container 1 can be closed as shown in FIG.

  Next, FIG. 5 is a developed view showing another embodiment of the packaging container according to the present invention, and FIG. 6 is a state where the packaging container shown in the developed view in FIG. 5 is assembled and opened. FIG. 7 is an overall perspective view showing the packaging container shown in a development view in FIG. 5 in an assembled state and in a closed state.

  The packaging container 2 shown in FIGS. 5 to 7 is different from the packaging container 1 shown in FIGS. 1 to 4 in the form of the cut provided in the hinge portion P, and other members are the same. It has the form. Therefore, the same members as those in the packaging container 1 are denoted by the same reference numerals and detailed description thereof is omitted, and only the changed points will be described in detail below.

  In the packaging container 2 shown in FIG. 5, a cut C2 including three cuts C2a, C2b, and C2c is provided in a portion excluding the vicinity of the end Pa on both sides of the hinge portion P. That is, connecting portions Pb and Pc for connecting the rear plate 15 of the container part a and the rear plate 25 of the lid part b are formed between the cuts C2a and C2b and between the cuts C2a and C2c. The connecting portions Pb and Pc function as hinges for rotating the lid portion b together with the end portions Pa on both sides of the hinge portion P. Here, assuming that the lengths of the three cuts C2a, C2b, and C2c constituting the cut C2 are L1a, L1b, and L1c, respectively, these have a relationship represented by the following expression (4).

  That is, the entire length of the cut C2 composed of the three cuts C2a, C2b, and C2c corresponds to 71 to 81% of the total length L of the hinge portion P, as in the packaging container 1 shown in FIG. Note that the number and length of cuts provided in a distributed manner in the hinge part P, and the arrangement thereof can be changed as appropriate.

  When the packaging container 2 of this form is assembled (see FIG. 6), the lid part b is rotated around the hinge part P, and the packaging container 2 is closed as shown in FIG. Since each of the cuts C2a, C2b, C2c provided in is relatively smaller than the cut C1 shown in FIG. 3, it is possible to effectively prevent foreign matter from entering the packaging container 2. Further, by forming the connecting portions Pb, Pc between the cuts C2a, C2b, C2c with a predetermined length, the rigidity in the axial direction of the hinge portion P can be increased, and the packaging container 2, particularly its hinge The deformation near the portion P can be effectively suppressed.

[Experiment to verify the inclination of the lid with respect to the container due to the difference in the length of the cut and the results]
The present inventors make packaging containers (Examples 1 to 3, Comparative Examples 1 and 2) having different cutting lengths, and cut the hinge portion of the packaging container suitable for storing articles such as hamburgers. The length was verified.

  Table 1 below shows the dimensions of the bottom plate of the container portion of the packaging container that is generally used to store articles such as hamburgers. In each of the packaging containers A to G shown in Table 1, the dimensions of the top plate of the lid part are the same as the dimensions of the bottom plate of the container part.

The present inventors use the packaging containers A to G shown in Table 1 to store foods having a substantially circular shape or a substantially oval shape, and have a leading edge with respect to the length of the side edge of the bottom plate of the container portion. Examples 1 to 3, using a packaging container F that has a relatively long trailing edge (the aspect ratio of the bottom plate is relatively large) and is easy to turn in a direction in which the lid portion closes in an open posture. Comparative examples 1 and 2 were produced. Here, the mass (weight) per unit area of the paper forming the packaging container F was 260 g / m ² , and the total length of the hinge part was 139 mm.

  As a manufacturing method of Examples 1 to 3 and Comparative Examples 1 and 2, cuts of 113 mm, 106 mm, 99 mm, 88 mm, and 75 mm, respectively, from the center to the axial direction with respect to the hinge portion of the packaging container F are equally performed. Formed. That is, in Examples 1 to 3 and Comparative Examples 1 and 2, cuts with lengths of 81%, 76%, 71%, 63% and 54% with respect to the entire length of the hinge portion were formed. In addition, by forming the above-mentioned notches, Examples 1 to 3 and Comparative Examples 1 and 2 have connection portions of 13 mm, 16.5 mm, 20 mm, 25.5 mm, and 32 mm in the vicinity of both ends of the hinge portion, respectively. Formed (see Table 2).

  And since the mass of one side of bread generally used for a hamburger is 20 to 50 g, the present inventors put a 40 g weight simulating bread on each of the container part and the lid part, and The inclination of the lid was measured.

  FIG. 8 is a diagram showing the status of the verification experiment. FIG. 8A shows the status of the verification experiment of Example 1, FIG. 8B shows the status of the verification test of Example 3, and FIG. FIG. Table 2 below shows the results of measuring the relative angle between the bottom plate of the container part of Examples 1 to 3 and Comparative Examples 1 and 2 and the top plate of the lid part.

  As shown in Table 2, the relative angles between the bottom plate of the container portion and the top plate of the lid portion in the open posture are 0 °, 5 °, and 10 ° in Examples 1 to 3, respectively. In No. 2, they were 15 ° and 20 °, respectively. Since the lid portion is larger than the container portion as described above, when the same weight is placed on the container portion and the lid portion as shown in FIG. 8, the container portion is relatively lifted. It became a state.

  In addition, the present inventors put a sauce such as a hamburger material on the containers and lids of Examples 1 to 3 and Comparative Examples 1 and 2, put the sauce, and verified the flow of the sauce. .

  As a result, in Comparative Examples 1 and 2, it was confirmed that the sauce flowed from the pan or the like and adhered to the top plate of the container part, while in Examples 1 to 3, the source flow or the top part of the container part was confirmed. The adhesion of the source to etc. was not confirmed.

  Thus, by providing a cut of 71% or more of the total length of the hinge portion with respect to the hinge portion, the container portion and the lid portion are placed on substantially the same plane, and the article is stored in the packaging container. It has been demonstrated that cooking and cooking are facilitated.

  FIG. 9 is a view showing a state where a packaging container in which the length of the connecting portion in the vicinity of the end portion of the hinge portion is smaller than 13 mm is put into the box making machine shown in FIG.

  As shown in the figure, when the length of the connecting portion near the end of the hinge portion is smaller than 13 mm, that is, smaller than 9.5% with respect to the total length of the hinge portion, the hinge portion is When the length of the connecting portion near the end of the hinge portion is smaller than 10 mm, that is, smaller than 8% with respect to the total length of the hinge portion, It was confirmed that the flexure of the hinge portion increased and a crack occurred near the end of the hinge portion.

In Examples 1 to 3 described above, the mass per unit area of the paper forming the packaging container (weighed) was 260 g / m ^2. For example, when the paper is 210 g / m ² , Since the force acting in the direction from the open posture to the closed posture is reduced, the mass of the container portion and the lid portion is also reduced. Therefore, it is considered that the same result as in Examples 1 to 3 can be obtained. For example, when the mass per unit area of the paper (weighing) is 310 g / m ² , the force acting from the open posture to the closed posture increases, while the mass of the container portion and the lid portion also increases. Therefore, it is considered that the same results as in Examples 1 to 3 can be obtained. That is, when the packaging container is formed of paper having a mass of 210 to 310 g / m ² that is generally used when providing food such as a hamburger, the same results as in Examples 1 to 3 described above are obtained. It is thought that it can be obtained.

DESCRIPTION OF SYMBOLS 1, 2 ... Packaging container, a ... Container part, 11 ... Bottom plate, 12 ... Front plate, 12a, 12a ... Extension part of front plate, 12b, 12b ... Part of extension part of front plate, 13, 14 ... Left and right Side plates, 13b, 14b ... front end portions of the left and right side plates, 13B, 14B ... first locking claws, 15 ... rear plate, 15a, 15a ... rear plate extension, b ... lid portion, 21 ... top plate, 22 ... Front plate, 23, 24 ... Left and right side plates, 23a, 24a ... Extension part of side plate, 23b, 24b ... End part of extension part of side plate, 23c, 24c ... Notch part, 23B, 24B ... Second engagement Stop claw, 25 ... rear plate, 25a, 25a ... extension of rear plate, 33 ... upper edge of extension of front plate, 34 ... upper edge of left and right side plates, 35 ... first locking claw (left and right side plates) The front edge of the container portion, the lower end of the rear plate of the container portion, the upper end of the rear plate of the lid portion, the P hinge portion, the Pa portion near the end of the hinge portion. (Connection part), Pb, Pc ... connection part, C1, C2, Ca ... notch, L ... full length of hinge part, L1, L1a, L1b, L1c ... length of notch, L2 ... near the end of hinge part Length, K ... Box making machine

Claims (5)

A container part and a lid part are packaging containers that can be opened and closed via a hinge part. The container part has a bottom plate, a front plate, left and right side plates, and a rear plate. In a packaging container having a plate, left and right side plates and a rear plate, wherein the upper edge of the rear plate of the container portion and the lower edge of the rear plate of the lid portion are continuously formed,
The packaging container is formed of paper having a mass of 210 to 310 g / m ² , and the portion excluding the vicinity of the ends on both sides of the hinge portion is 71 to 81% of the total length of the hinge portion. A packaging container, characterized by being provided with a length cut.   2. The packaging container according to claim 1, wherein the total length in the vicinity of the end portions on both sides is 8% or more of the total length of the hinge portion.   The bottom plate and the top plate of the packaging container have a square shape or a rectangular shape in which sides connected to the front plate and the rear plate among the sides of the bottom plate and the top plate form long sides. The packaging container according to 1 or 2.   The distance between the lower edge and the upper edge of the rear plate in the container portion is d1, the angle between the bottom plate and the rear plate is θ1, the distance between the lower edge and the upper edge of the rear plate in the lid portion is d2, and the top plate The packaging container according to any one of claims 1 to 3, wherein d1 sin θ1 = d2 sin θ2 when the angle formed with the rear plate is θ2.   The packaging container according to any one of claims 1 to 4, wherein the cuts are provided in a distributed manner in the hinge portion.

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