JP2004345712A - Packaging container and manufacturing method for the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a packaging container, which enables the lid and body to be fitted together easily when the container is closed and to be separated easily when the container is opened, and which hardly opens automatically when receiving an external impact or the like. <P>SOLUTION: When the lid 14 of the container is moved to a position where the lid covers the container body 12, a hinge 13 is folded back accurately at pre-folded parts 13A, 13B, which allows a fitting projection 14a on the lid 14 to be moved accurately to the position where the projection is opposite to a fitting recession 12d on the container body 12, that is, the position where the projection 14a can be fitted into the recession 12d. This makes it easy to fit the lid 14 into the container body 12. Besides, when the lid 14 is moved to cover the container body 12, a flange 14b of the lid 14 is fitted into a stepped part 12c of the container body 12, where the flange is not exposed to the outside. As a result, an external impact or the like does not act directly on the flange 14b, which prevents the lid 14 from automatically opening due to such an impact. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a packaging container formed of a resin sheet, and more particularly to a packaging container closed by fitting a lid to a container body and a method of manufacturing the same.
[0002]
[Prior art]
2. Description of the Related Art Packaging containers integrally formed using a resin sheet so that a container body and a lid can be folded back via a hinge portion have been widely and generally used.
[0003]
In this type of container, the flange portion of the lid and the flange portion of the container body are locked by using a locking means such as a stapler, heat fusion, or adhesive tape, or by being tied up with a rubber band or the like. The lid is prevented from easily detaching from the container body.
[0004]
On the other hand, since the above-described means requires tools and tapes and is troublesome in work, an uneven portion for engagement is formed on the lid and the container body, and the uneven portion is fitted when closed. And a configuration for maintaining the closed posture of the lid.
[0005]
As a prior art document relating to such a packaging container, there is, for example, the following Patent Document 1.
[0006]
In a packaging container described in Patent Document 1 below, a lid 1 and a container body 2 are connected via a hinge 3, and a strip formed on a surface of an outer peripheral wall of a projection 12 on the lid 1 side. The groove 121 and the protrusion 241 formed on the upper part of the peripheral wall 24 of the container body 2 are fitted to each other, and the protrusion 135 formed on the flange 13 of the lid 1 and the protrusion 23 formed on the flange 23 of the container body 2. The lid 1 is fitted to the container main body 2 by fitting the ridges 235 with each other, that is, by performing double concave-convex fitting, so that the closed state of the packaging container is reliably maintained. Things.
[0007]
[Patent Document 1]
JP-A-8-72909
[0008]
[Problems to be solved by the invention]
By the way, in a packaging container in which the container body and the lid are connected via the hinge portion, it is important that the container body and the lid are easily and reliably fitted when the lid is folded. In particular, in the packaging container described in the above-mentioned conventional patent document 1, since the concave-convex fitting is performed by the groove and the ridge, accurate alignment between the container body and the lid is required.
[0009]
However, since the container of Patent Document 1 is formed by thermoforming, the accuracy of forming the hinge portion 3 tends to be low. For this reason, when the lid 1 is folded back, the hinge 3 is previously formed in an arc shape, a U-shape, a V-shape or a U-shape with the lid 1 and the container body 2 opened. It is necessary to allow the hinge portion 3 to have an allowance due to roundness, to increase the degree of freedom in which the lid 1 can move, and to allow the lid 1 and the container body 2 to be aligned. That is, in the configuration described in Patent Literature 1, since the bending accuracy of the hinge portion 3 is low, it is necessary to align the lid 1 with respect to the container body 2 after the lid 1 is turned back, and then the concave-convex fitting is performed. There is a problem that cannot be performed.
[0010]
Further, the above-mentioned Patent Document 1 has a structure in which a large springback (restoring force for the hinge portion 3 to return to the original open state before the folding) is easily generated in the roundness formed on the hinge portion 3 after the folding. For this reason, in Patent Literature 1, the provision of the double concave-convex fitting prevents the concave-convex fitting between the lid 1 and the container body 2 from being easily released.
[0011]
However, at the time of opening, it is necessary to open the double concave and convex fittings at the same time, so that it is difficult for an unskilled person to open the packaging container. Therefore, there is a problem that the food (for example, Western confectionery) stored therein easily loses its shape due to the impact at the time of opening.
[0012]
In addition, if one of the double concave and convex fittings is eliminated to make one, the fitting and opening can be performed more easily than in the case of double fitting.
[0013]
However, the holding force due to the one concave-convex fit is smaller than that of the double case. Moreover, in the packaging container, the flange 13 of the lid 1 and the flange 23 of the container main body 2 are fitted in a state of being simply overlapped, and for example, an impact generated during transportation or the like is directly applied to the flanges 13 and 23. It is a configuration that works easily. Therefore, if the concave / convex fitting is disengaged by such an impact, there is a problem that the lid 1 cannot be prevented from being automatically opened by the action of the spring back of the hinge portion 13.
[0014]
Further, in Patent Document 1, the effective width n of the hinge 3 on the container body 2 needs to be larger than the effective width m of the hinge 3 on the lid 1, and the hinge 3 is formed. It is necessary to provide a step on at least one of the flange 13 of the lid 1 and the flange 23 of the container body 2, and when the lid 1 is fitted to the container body 2, the hinge portion 3 is positioned outside the packaging container. There is also a problem that the appearance of the packaging container is not excellent in quality because it is exposed in a state of protruding greatly.
[0015]
SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and a packaging container and a method of manufacturing the same, in which the molding accuracy of a hinge portion is improved and the fitting of a container body and a lid is easily and reliably performed. It is intended to provide.
[0016]
The present invention also provides a packaging container that effectively prevents the lid from being easily opened by an external impact when the lid is held in a fitted state with the container body. It is aimed at.
[0017]
It is a further object of the present invention to provide a packaging container in which the lid can be easily detached from the container body when opening.
[0018]
[Means for Solving the Problems]
The present invention includes a container main body having an opening and capable of storing an article to be packaged, a lid covering the opening of the container main body, and a hinge portion located between the container main body and the lid. In the provided synthetic resin material packaging container,
When the lid is removed from the container main body, the container body, the hinge portion, and the lid are deployed so as to be arranged in this order, the arrangement direction is the Y direction, and the container main body and the lid when the lid is closed are overlapped. When the direction is a Z direction, and a direction orthogonal to both the Y direction and the Z direction is an X direction,
When the ceiling surface of the lid and the bottom surface of the container main body are developed so as to be parallel to the XY plane, the hinge portion developed in a plane is positioned between the lid and the container main body. And
The hinge portion includes a first flat portion, a fold portion, a second flat portion, a pair of folds extending in parallel in the X direction at intervals in the Y direction from the container body side toward the lid. A fold portion and a third flat portion are sequentially formed,
When the lid is overlaid on the container body, the second flat portion rises in the Z direction, and the third flat portion faces the first flat portion in the Z direction. It is assumed that.
[0019]
In the above, it is preferable that the folding habit portion is formed by linearly pressing a synthetic resin sheet forming a hinge portion.
[0020]
In the present invention, since the hinge portion can be bent at a right angle from each of the kinks, only by moving the lid to the upper part of the container, the lid is brought into a position where the lid can be fitted to the container body. Can be guided accurately. Therefore, the lid can be easily fitted to the container body.
[0021]
Further, a receiving portion is formed around the opening of the container main body, and a flange overlapping the receiving portion when covering the opening of the container main body is formed at an edge of the lid, and the receiving portion has Preferably, when the flanges overlap each other, a step portion facing at least a part of the edge of the flange is provided.
[0022]
According to the above-mentioned means, since the flange of the lid is not directly exposed to the outside, it is possible to prevent an external impact from directly acting on the flange. For this reason, it is possible to prevent the lid of the packaging container from being opened by an external impact.
[0023]
Moreover, mischief, such as entry of foreign matter into the packaging container, can be prevented.
Furthermore, a locking projection is formed on the container body from the corner of the opening toward the center of the container body, and a locked portion is formed at the corner of the lid, and the lid is It is preferable that the locked portion is inserted into a lower portion of the locking protrusion when the container is placed on the container body.
[0024]
In the above means, since the lid is securely held by the container body, the packaging container is automatically opened except for the person who has purchased the product in which the object to be packaged is stored in the container performs the opening operation. This can be prevented, and when the purchaser performs the opening operation, the opening can be easily performed.
[0025]
The present invention also provides a container having a main body forming recess and a lid material forming concave portion, a synthetic resin sheet, a container main body, a lid covering the container main body, and a position between the container main body and the lid. In the method for manufacturing a packaging container integrally molded with a hinge portion to be
(A) heating and softening a planar synthetic resin sheet;
(B) Using at least one of the air suction pressure and the air pressure, the softened synthetic resin sheet is brought into close contact with the main body forming concave portion and the lid material forming concave portion to form the outer shape of the container main body and the lid material. Process and
(C) At the same time as the step (b) or before or after the step (b), a linear pressing force is applied to the softened synthetic resin sheet located between the main body forming recess and the cover material forming recess. To form a linear bent portion extending in a direction orthogonal to the direction in which the container body and the lid member are arranged between the container body and the lid member.
[0026]
In the above invention, a pair of folding habits can be formed with high precision with respect to the hinge part of the packaging container.
[0027]
In the above, it is preferable that the above-mentioned kinks are formed at two places in parallel.
The mold has a flat surface between the main body forming concave portion and the lid material forming concave portion, and in the step (c), the flat surface is formed between the linearly extending convex portion and the flat surface. It is preferable that the resin sheet is sandwiched to form the above-mentioned kinks.
[0028]
Further, in the step (b), a locking convex portion facing from the corner of the opening of the container main body to the center of the container main body, and locking to the locking convex portion at the corner of the lid body. And the locked part to be locked are preferably formed.
[0029]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a perspective view showing a packaging container in an open state as an embodiment of the present invention, FIG. 2 shows the packaging container in an open state, (A) is a side view of the packaging container, and (B) is II in FIG. FIG. 3A is a side view of the packaging container in a closed state, and FIG. 3B is a cross-sectional view of the packaging container in a closed state. 4 and 5 are enlarged sectional views showing a main part of the packaging container in FIG. 1, and FIG. 4 (A) is a sectional view taken along line aa, which is one open end of the packaging container. 4B is a cross-sectional view taken along the line bb which is a hinge portion, FIG. 4C is a cross-sectional view taken along the line c-c which is the other open end of the packaging container, and FIG. FIG. 5B is a sectional view taken along line d-e of FIG. 5B, which is a locked portion. FIG. 6 is an enlarged cross-sectional view showing a main part of the packaging container in a closed state, in which (A) is a cross-sectional view showing an overlap between one open end and the other open end of the packaging container, and (B) is a cross-sectional view. FIG. 4C is a cross-sectional view of the hinge part, and FIG. 4C is a cross-sectional view of the locking part and the locked part.
[0030]
A packaging container 10 shown in FIG. 1 is a container for storing foods such as Western confectionery and Japanese confectionery, for example, and has a configuration in which a container body 12 and a lid 14 are connected by a hinge portion 13 provided therebetween. is there. The container body 12, the hinge portion 13, and the lid 14 are integrally formed in a thin shape using a synthetic resin sheet such as PET (polyethylene terephthalate).
[0031]
In FIG. 1, the direction in which the container body 12, the hinge portion 13, and the lid 14 are arranged is the Y direction, the direction in which the container body 12 and the lid 14 overlap when the lid 14 is closed is the Z direction, The direction orthogonal to both of the Z directions is the X direction.
[0032]
As shown in FIG. 1, the container body 12 has a bottom surface 12A formed in a substantially square shape, a plurality of side walls 12B extending from the bottom surface 12A in the illustrated Z1 direction, and a connection side wall connecting between the side walls 12B and the side walls 12B. 12C, and a space surrounded by the bottom surface 12A, the side wall 12B, and the connection side walls 12C provided at the four corners is a first housing portion. The upper portion of the first housing portion in the illustrated Z1 direction is an opening 12D. Note that the connection side wall 12C is a surface that is inclined at a fixed angle (for example, 45 °) with respect to the illustrated X direction and Y direction.
[0033]
As shown in FIGS. 1, 2 (A), (B) and 4 (A), the edge of the opening 12D, that is, the upper end of the side wall 12B, is formed in a convex shape in cross section, and is shown in the X direction and the Y direction. A first ridge (receiving portion) 12a extending in the direction is provided. At the upper end position of the first ridge 12a and at a position outside the drawing when viewed from the center side of the container body 12 (the first storage portion side), the width of the first ridge 12a is smaller than the width of the first ridge 12a. A second ridge 12b having a narrow width is integrally formed along the first ridge 12a. As shown in FIG. 4A, a step 12c is formed at the boundary between the first ridge 12a and the second ridge 12b. A step is also formed between the first ridge 12a and the side wall 12B, and the step forms a fitting recess 12d.
[0034]
The dimension of the fitting recess 12d in the illustrated Z direction, that is, the height dimension of the first ridge 12a is unified to h. At four corners, fitting recesses 12d are provided between the connecting side wall 12C and a locking projection 12e1, which will be described later, which are inclined at the same angle in the X and Y directions in the drawing.
[0035]
As shown in FIG. 1, the fitting recess 12d on the Y1 side in the drawing and the fitting recess 12d on the Y2 side in the drawing face each other in parallel, and similarly, the fitting recess 12d on the X1 side and the fitting on the X2 side. The recesses 12d also face each other in parallel. The facing distance between the fitting recess 12d on the Y1 side and the fitting recess 12d on the Y2 side is set to L1a, and the fitting recess 12d on the X1 side and the fitting recess 12d on the X2 side are set to L1a. Is set to L1b.
[0036]
The first ridges 12a are formed at the upper ends of all the side walls 12B. However, as shown in FIG. 4B, the second ridges 12b are located on the Y1 side on the hinge portion 13 side. Are not formed on the side wall 12B, but are formed only on the upper ends of the other side walls 12B.
[0037]
As shown in FIG. 1 and FIG. 5A, a locking portion 12e is provided at a corner of the container body 12 and at a portion where the first ridges 12a extending in the X and Y directions shown in the drawing intersect. Is formed. The locking portion 12e is formed so as to protrude above the first ridge 12a (in the Z1 direction in the drawing), and has a substantially triangular locking protrusion protruding toward the center of the container body 12 on the inner surface thereof. 12e1 are formed. A flange 12f extending horizontally from the base end of the locking portion 12e is formed outside the locking portion 12e.
[0038]
As shown in FIG. 1, the lid body 14 has a ceiling surface 14A formed in a substantially square planar shape similarly to the container body 12, a side wall 14B extending from the ceiling surface 14A in the illustrated Z1 direction, and an adjacent side wall 14B. A connecting side wall 14C is provided between the side wall 14B and the connecting side wall 14B at the same angle with respect to the X direction and the Y direction. A space surrounded by the ceiling surface 14A, the side wall 14B, and the connection side wall 14C is a second housing portion.
[0039]
As shown in FIGS. 4 (C) and 5 (B), the tips of the side wall 14B and the connecting side wall 14C are bent into a convex shape, and the bent portion is a fitting convex portion 14a.
[0040]
The fitting projection 14a is formed continuously along the upper end of each of the side walls 14B and the connecting side wall 14C extending in the X and Y directions in the drawing. The height of the fitting projection 14a is the same as the height h of the first ridge 12a, or a height slightly lower than the height h.
[0041]
As shown in FIG. 1, the fitting projection 14a on the Y1 side in the drawing and the fitting projection 14a on the Y2 side in the drawing face each other in parallel, and similarly, the fitting projection 14a on the X1 side and the X2 side in the drawing. Are opposed to each other in parallel with each other. The facing distance between the fitting protrusion 14a on the Y1 side and the fitting protrusion 14a on the Y2 side is set to L2a, and the fitting protrusion 14a on the X1 side and the fitting protrusion on the X2 side are set. The facing distance between the projections 14a is set to L2b.
[0042]
As shown in FIG. 4 (C), an end of the side wall 14B and an extended portion of the fitting projection 14a are formed with a flange 14b extending outwardly when viewed from a central portion (a second storage portion) of the lid 14. Is formed. The flange 14b is formed horizontally with respect to the illustrated XY plane. On the other hand, a locked portion 14c is provided at a corner of the lid 14. The locked portion 14c is formed by obliquely cutting a tip of the flange 14b, that is, a part of a tip of the connection side wall 14C at a corner portion, and as shown in FIG. It is bent outward.
[0043]
A handle 14E formed by extending the flange 14b is provided continuously to the locked portion 14c at a position near the locked portion 14c on the open end side in the Y1 direction in the drawing. ing.
[0044]
As shown in FIGS. 1 and 4B, the hinge portion 13 is provided between the first ridge 12a of the container main body 12 and the fitting projection 14a of the lid 14. As shown in FIGS. 1 and 2A and 2B, when the packaging container 10 is completely opened, the hinge portion 13 is attached to the XY plane shown in the drawing, that is, the bottom surface 12A and the ceiling surface 14A. It is formed substantially horizontally with respect to.
[0045]
As shown in FIG. 4 (B), the hinge portion 13 is formed with a pair of bent portions 13A and 13B extending parallel to each other in the X direction in the figure. In FIG. 4 (B), the cross section of the fold portion 13A and the fold portion 13B has a substantially V-groove shape (or an inverted trapezoidal groove shape) in which the apexes of the triangles are provided in the Z2 direction in the drawing. Other than that, it is also possible to have a substantially square shape or a substantially circular shape. However, in consideration of the ease of folding when deforming the hinge portion 13 and the appearance of the entire packaging container 10 after the deformation, it is preferable that the shape is substantially V-shaped (or inverted trapezoidal-shaped) (FIG. 8C). reference).
[0046]
That is, as shown in FIG. 8 (C), in the present invention, the cross-sectional shape of the one bent portion 13A is formed by the slope 13A1, the slope 13A2, and the fold 13A3. The fold 13A3 is the portion that is the most concave in the Z2 direction in the figure, and the slopes 13A1 and 13A2 are 45 ° from both ends in the Y direction of the fold 13A3 toward the surface of the hinge portion 13 (the surface of the resin sheet). At an angle of. Similarly, the other fold portion 13B also has a slope 13B1, a slope 13B2, and a fold 13B3. (The surface of the resin sheet) at an angle of 45 °. Therefore, the angle θ between the slopes 13A1 and 13A2 and the angle θ between the slopes 13B1 and 13B2 are both right angles (90 °).
[0047]
As shown in FIG. 4 (B), the one bent portion 13A is formed at a position of a length dimension W1 from the base end of the first ridge 12a, and the other bent portion 13B is It is formed at a position of the length dimension W2 from one of the kinks 13A. In addition, the length dimension from the other bent portion 13B to the base end of the fitting projection 14a on the lid 14 side is W3. The hinge 13 has a length W1 corresponding to the first flat portion 13a, a length W2 corresponding to the second flat portion 13b, and a length W3 corresponding to the third flat portion. The portions 13c are respectively formed.
[0048]
In this case, the length dimension W2 of the second flat portion 13b is preferably longer than the height dimension h of the first ridge 12a (W2> h), and more preferably both are the same length dimension. (W2 = h).
[0049]
When the width of the first ridge 12a is W0, the length W3 of the third flat portion 13c is equal to the width W0 of the first ridge 12a. It is preferably longer (W3> W0 + W1) than the length dimension (W0 + W1) including the length dimension W1, and more preferably W3 = W0 + W1.
[0050]
In FIG. 4B, the most preferable forms, that is, W2 = h and W3 = W0 + W1 are set.
[0051]
Next, the operation of each part when the packaging container 10 is changed from the open state shown in FIGS. 2A and 2B to the closed state shown in FIGS. 3A and 3B will be described.
[0052]
An article to be packaged (not shown) such as a confection is placed on the bottom surface 12A on the container body 12 side of the packaging container 10 in an open state. From this state, when the container body 12 is fixed and the lid 14 is rotated in the α1 direction shown in FIG. 1, the hinge 13 is bent at the fold 13A and the fold 13B. The opening 12D of the container body 12 can be covered by the opening 14D of the container 14.
[0053]
At this time, on the hinge portion 13 side, as shown in FIG. 6B, the second flat portion 13b is bent at the one bending portion 13A with respect to the first flat portion 13a. Get up in the direction. At this time, the bend portion 13A bends around the fold allowance 13A3, and one slope 13A1 comes into close contact with the other slope 13A2. However, since the angle θ between them is formed at a right angle, The second flat portion 13b can be bent at a right angle to the first flat portion 13a. Further, since one slope 13A1 can be in close contact with the other slope 13A2, the generation of a restoring force (spring back) for returning the second flat portion 13b to the original state can be reduced.
[0054]
Further, since W2 = h and W3 = W0 + W1 as described above, when the third flat portion 13c is bent at the other bending habit portion 13B, the third flat portion 13c becomes the first ridge ( (A receiving part) 12a. Also at this time, the bend portion 13B bends around the fold allowance 13B3, and one slope 13B1 comes into close contact with the other slope 13B2, but the angle θ between them is formed at a right angle. Therefore, the third flat portion 13c can be bent at a right angle to the second flat portion b. Also at this time, since one slope 13B1 can be in close contact with the other slope 13B2, the generation of a restoring force (spring back) for returning the third flat portion 13c to the original state can be reduced.
[0055]
Therefore, the third flat portion 13c after the turn can be faced in parallel with the first flat portion 13a. In addition, since the individual springbacks in the kinking portions 13A and 13B can be reduced, springback generated in the entire hinge portion 13 (restoring force for the hinge portion 13 to return to the original open state before folding). Is reduced, and the state of the lid 14 after the folding can be easily maintained.
[0056]
Therefore, the fitting protrusion 14a on the lid 14 side can be accurately moved to a position facing the fitting recess 12d of the container body 12, that is, a position where the fitting can be fitted.
[0057]
At this time, on the hinge 13 side, the fitting protrusion 14a on the lid 14 side is fitted inside the fitting recess 12d of the container body 12.
[0058]
Further, as shown in FIG. 6A, the lid 14 is lightly pushed in the Z2 direction in the opening 12D on the Y2, X1, and X2 sides of the container body 12 except for the hinge portion 13 side in the Y1 direction. The fitting projection 14a on the lid 14 side can be fitted into the fitting recess 12d of the container body 12. At the same time, a flange 14b extending horizontally from the fitting projection 14a fits into a step 12c between the first ridge 12a and the second ridge 12b on the container body 12 side.
[0059]
Further, as shown in FIG. 6C, at the corners of the container body 12 and the lid 14, the fitting projections 14a on the lid 14 are fitted into the fitting recesses 12d on the container body 12. However, at the time of this fitting operation, the locked portion 14c formed at the tip of the connection side wall 14C of the lid 14 is positioned below the locking projection 12e1 provided on the locking portion 12e of the container body 12. Is inserted into That is, the locked portion 14c formed at the tip of the connecting side wall 14C abuts on the locking convex portion 12e1 at the time of the fitting operation, but further acts on the lid 14 in the fitting direction (Z1 direction in the drawing). Is applied, a force in the direction approaching the locking projection 12e1 is applied to the locked portion 14c, so that the outer wall of the fitting projection 14a is bent and deformed toward the center of the container body 12. Let me do. Therefore, the locked portion 14c can get over the locking protrusion 12e1 in the Z2 direction in the drawing to reach the state shown in FIG. 6C. In the state shown in FIG. 6C, the locked portion 14c is lightly locked below the locking projection 12e1. That is, the locking portion 12e and the locked portion 14c function as locking means for holding the lid 14 to the container body 12.
[0060]
By the operation described above, the packaging container 10 is set to the closed state as shown in FIGS. At this time, since the gap between each flange 14b of the lid 14 and the upper end of each first ridge (receiving portion) 12a of the container body 12 is in close contact, the packaging container 10 is set in a completely closed state. . The article to be packaged is stored in a storage section, which is a space formed by the first storage section on the container body 12 side and the second storage section on the lid 14 side.
[0061]
When the packaging container 10 is completely closed, the locking portion 14c is locked by the locking projection 12e1 at four corners of the packaging container 10. Therefore, even when an external impact is applied to the packaging container 10, it is possible to prevent the lid 14 from easily detaching from the container body 12 and being automatically opened.
[0062]
In particular, in the packaging container 10 of the present invention, since the flange 14b of the lid 14 is located in the step 12c and is not directly exposed to the outside, it is possible to prevent external impact from being directly applied to the flange 14b. It is possible. Therefore, erroneous opening due to the impact of the lid 14 can be effectively prevented, and the packaged object inside the packaging container 10 can be reliably protected.
[0063]
Further, in the packaging container 10, the length dimension of the hinge portion 13 can be formed with high precision by manufacturing using the manufacturing method described later. Therefore, when the lid 14 is folded back at the hinge portion 13, the displacement of the lid 14 in the front-rear direction (Y direction) or the left-right direction (X direction) with respect to the container body 12 can be reduced. That is, since the lid 14 can be accurately positioned with respect to the container main body 12, the fitting operation between the container main body 12 and the lid 14 can be performed easily and smoothly.
[0064]
Further, as shown in FIGS. 3A and 3B, the hinge portion 13 after the deformation does not greatly protrude outside the packaging container 10. Therefore, the appearance of the entire packaging container 10 can be maintained.
[0065]
Next, an opening operation for bringing the packaging container from the closed state to the open state will be described.
In the closed state shown in FIGS. 3A and 3B, the handle 14 </ b> E provided on the lid 14 is located near the locking portion 12 e provided on the container body 12 in the X <b> 1 direction and the Y <b> 2 direction. I have.
[0066]
With one finger, the handle 14E is lightly grasped, and the flange 12f provided at a corner (corner on the X1 and Y2 side in the drawing) corresponding to the handle E on the container main body 12 is connected to the other. The finger is pressed down from above and below, and in this state, the one hand is gently lifted in the Z1 direction away from the container body 12. At this time, the locked portion 14c connected to the handle E is elastically deformed toward the center by the lifting force, so that the locked state between the locked portion 14c and the locking projection 12e1 is easily released. be able to.
[0067]
Alternatively, a finger can be inserted into the lower part of the locking portion 12e from the lower position in the figure, and the locking portion 12e can be easily elastically deformed by lightly pulling the locking portion 12e outward. Therefore, the locked state between the locked portion 14c and the locking protrusion 12e1 can be easily released by such a method.
[0068]
When the locked state of one of the four locking portions 12e provided on the packaging container 10 is released, the lid 14 formed of a thin resin sheet is placed on the packaging container 10 as shown in FIG. It can be easily moved in the direction or the Y direction. Accordingly, the locked state of the locking portion 12e located on the opposite side (X2 side) from the locking portion 12e on the X1 side in the figure is easily released.
[0069]
When the locking state of the two locking portions 12e of X1 and X2 on the open end side, which is the Y2 side in the drawing, is released, the lid 14 is slightly rotated in the α2 direction in the drawing by the returning force of the hinge portion 13. Therefore, it is opened between the container body 12 and the lid 14 on the opening end side. However, even when the finger gripping the handle 12E is released, the springback of the hinge portion 13 is small, and the locked state of the two locking portions 12e on the Y1 side in the drawing is not released. However, the state in which the lid 14 is completely opened (the state in FIG. 1) does not occur.
[0070]
The locking state at the two locking portions 12e on the Y1 side in the drawing can be easily released by further moving the hand on the side holding the handle 12E in the α2 direction in the drawing. Thereby, the packaging container 10 can be shifted to the open state (or the unfolded state) shown in FIG. 1, and it becomes possible to take out the confectionery which is the packaged object stored inside the packaging container 10. .
[0071]
In the above-described packaging container 10, a case has been described in which all of the three elements of the pair of fold portions 13A and 13B, the step portion 12c, and the locking means (the locking portion 12e and the locked portion 14c) are provided. However, the present invention is not limited to this, and each element may be independently provided for one packaging container 10, or any one may be provided for one packaging container 10. Two elements may be provided.
[0072]
Next, a method for manufacturing the packaging container will be described.
7 (A) to 7 (C) are process diagrams showing a method of manufacturing a packaging container according to the present invention, and FIGS. 8 (A) to 8 (C) are process diagrams showing enlarged processes for forming a folding habit portion in a hinge portion. It is.
[0073]
The following description is an example in which PET is used as a synthetic resin.
First, in the step of FIG. 7A, a resin sheet 30 in which PET is extended in a thin plate shape is intermittently conveyed by a conveying unit (not shown). A heater 41 is provided in the middle of the transport path, and the resin sheet 30 is heated by the heater 41 until the temperature reaches a suitable molding temperature. The suitable temperature for molding is preferably in the range from the glass transition point temperature to the melting point, and in the case of PET, the glass transition temperature is 60 to 70 ° C, and the melting point is 250 ° C. A more preferable moldability temperature is about 120 ° C.
[0074]
7B, the heated and softened resin sheet 30 is placed between the female mold 32 and the covering member 33 which faces the mold 32 and covers the mold 32. Transported to
[0075]
The covering member 33 is provided so as to be able to move up and down, and is provided so as to be able to move up and down in a direction approaching or separating from the mold 32. The cover member 33 is provided with an intake duct 33a, through which air can be sent. The mold 32 includes a main body forming concave portion 32a for forming the container main body 12, a lid forming concave portion 32b for forming the lid 14, and a hinge between the main body forming concave portion 32a and the lid forming concave portion 32b. It has a flat surface 32c for forming the portion 13. In addition, convex portions for forming the first ridges (receiving portions) 12a and the fitting convex portions 14a are provided at both ends in the Y direction of the flat surface 32c.
[0076]
In this step, the covering member 33 is moved in a direction approaching the mold 32 to cover and cover the entire mold 32, and the resin sheet 30 is sandwiched between the mold 32 and the covering member 33. Is done.
[0077]
In the step of FIG. 7C, compressed air is sent between the covering member 33 and the mold 32 through the duct 33 a of the covering member 33. At this time, the resin sheet 30 in the softened state is brought into close contact with the main body forming concave portion 32a, the lid forming concave portion 32b, and the flat surface 32c of the mold 32 by the pressing force of air, and the outer shape of the packaging container 10 is formed. (Pressure molding).
[0078]
Instead of the intake duct 33a, an exhaust duct (not shown) and a hole communicating with the duct are provided in the main body forming concave portion 32a, the lid forming concave portion 32b and the flat surface 32c of the mold 32. In this case, the resin sheet 30 may be brought into close contact with the mold 32 by using air suction pressure to form the outer shape of the packaging container 10 (vacuum forming).
[0079]
Alternatively, by simultaneously operating the air intake duct 33a provided on the covering member 33 side and the exhaust duct provided on the mold 32 side, that is, by using both air pressure molding and vacuum molding, the packaging container 10 May be formed.
[0080]
Next, formation of the kinks 13A and 13B will be described with reference to the following process diagrams of FIGS.
[0081]
In the step of FIG. 8A, the covering member 33 is removed, and a pressing member 35 that can move freely in the Z1-Z2 direction is provided instead. The pressing member 35 is opposed to the flat surface 32c of the mold 32, and two ridges 35a and 35b extending linearly in the X direction in the drawing have a predetermined facing distance on the lower surface 35A. And are provided in parallel. The cross-sectional shape of each of the ridges 35a and 35b is substantially triangular (or trapezoidal), and press ends 35a3 and 35b3 formed in parallel with the flat portion 32c of the mold 32 are provided at the ends thereof. I have. A slope 35a1 and a slope 35a2 are provided at both ends in the illustrated Y direction of one ridge 35a, and a slope 35b1 and a slope 35b2 are also provided at both ends of the other ridge 35b. The angles θ between the slopes 35a1 and 35a2 and between the slopes 35b1 and 35b2 are both 90 ° (θ = 90 °). The distance between the center of the pressing portion 35a3 in the Y direction and the center of the pressing portion 35b3 in the Y direction (the distance between the protruding ridges 35a and the protruding ridges 35b) is equal to the distance between the fold portions 13A and 13B. Is set to the same size as the length dimension W2 between them. When the pressing member 35 is used, the ridges 35a and 35b may be heated to a molding suitable temperature (120 ° C.) in advance.
[0082]
As shown in the step of FIG. 8B, the pressing member 35 is moved in the Z2 direction in the drawing, and the ridges 35a and 35b are connected to the first ridge 12a of the packaging container 10 and the fitting projection 14a. Inserted between. Then, the resin sheet 30 forming the hinge portion 13 is sandwiched between the ridges 35 a and 35 b and the flat surface 32 c of the mold 32. At this time, since the ridges 35a and 35b are maintained at an appropriate molding temperature (120 ° C.), the resin sheet 30 forming the hinge portion 13 is plastically deformed by the pressing portions 35a3 and the pressing portions 35b3. At the same time, since the ridges 35a and 35b press the resin sheet 30 forming the hinge portion 13 in the Z2 direction in the drawing, a part thereof (folding margins 13A3 and 13B3) is softened and compressed (densified). Therefore, as shown in FIG. 8 (C), by pulling up the pressing member 35 in the Z1 direction in the figure, the resin sheet 30 forming the hinge portion 13 is partially thinned into a substantially V-shaped groove. (Or inverted trapezoidal groove) can be formed.
[0083]
At this time, an angle θ (= 90 °) is formed between the inclined surface 13A1 and the inclined surface 13A2 of the one bent portion 13A, and similarly, the inclined surface 13B1 and the inclined surface 13B2 of the other folded portion 13B are formed. The angle is also formed at an angle θ (= 90 °). Then, a fold 13A3 in which the resin sheet 30 is compressed is formed between the slope 13A1 and the slope 13A2, and a fold 13B3 is similarly formed between the slope 13B1 and the slope 13B2.
[0084]
As described above, the outer shape of the packaging container 10 can be formed by using the steps of FIGS. 7A to 7C, and by subsequently using the steps of FIGS. 8A to 8C. In addition, it is possible to form the kinks 13A and 13B on the resin sheet 30 forming the hinge 13 with high precision.
[0085]
In the above-described embodiment, the process of forming the outer shape of the packaging container 10 first and then forming the fold portions 13A and 13B has been described. However, the present invention is not limited to this. It is also possible to form the outer shape of 10 and simultaneously form the kinks 13A and 13B. In this case, it becomes possible by providing the ridges 35a and 35b on the covering member 33. Alternatively, the fold portions 13A and 13B may be formed first, and then the outer shape of the packaging container 10 may be formed.
[0086]
【The invention's effect】
As described above, according to the present invention, it is possible to provide a packaging container in which the accuracy of forming the hinge portion is improved and a method of manufacturing the same.
[0087]
In particular, since the hinge portion of the present invention is formed by pressing, the forming accuracy of the bent portion of the hinge portion can be remarkably improved as compared with the case of Patent Document 1 (when formed by thermoforming). . In addition, since the present invention has a double hinge structure in which the folding portion is arranged in parallel with the hinge portion, the bending accuracy can be improved.
[0088]
In Patent Document 1, the effective width of the hinge portion on the container body side needs to be larger than the effective width of the hinge portion on the lid body. However, in the present invention, the entire hinge portion is formed as a flat surface and has the same effective width. In this respect, the bending accuracy of the hinge portion can be improved also in this respect.
[0089]
Therefore, it is possible to provide a packaging container in which the container body and the lid are easily and reliably fitted to each other.
[0090]
Further, the container disclosed in Patent Document 1 basically adopts an inner fitting method and has a double fitting in which the groove (121, 135) on the lid body and the ridge (241, 235) on the container body are fitted respectively. On the other hand, the present invention relates to a fitting method in which the locked parts provided at the four corners on the lid body are inserted below the locking projections of the locking parts provided at the four corners on the container body side. Has adopted. Therefore, it is possible to provide a packaging container that can easily fit the container body and the lid when the container is closed and that can be easily opened when the container is opened.
[0091]
Further, in the present invention, unlike the Patent Document 1, the hinge portion can be formed in a planar shape, and further, it is not necessary to provide a step in the hinge portion. For this reason, when the lid is fitted to the container main body, the hinge portion does not greatly protrude to the outside of the packaging container, and the appearance quality of the packaging container can be maintained.
[0092]
Furthermore, since the flange of the lid is not directly exposed to the outside in the closed state, the lid is automatically opened by an external impact or the like when the lid is held in a fitted state with the container body. This can be effectively prevented.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a packaging container in an open state according to an embodiment of the present invention;
FIG. 2 shows the packaging container in an open state, (A) is a side view of the packaging container, (B) is a cross-sectional view taken along line II-II of FIG. 1,
3A is a side view of the packaging container in a closed state, FIG. 3B is a cross-sectional view of the packaging container in a closed state,
4 is an enlarged cross-sectional view showing a main part of the packaging container in FIG. 1, wherein (A) is a cross-sectional view taken along line aa of one open end of the packaging container, and (B) is a hinge portion. A certain bb line sectional view, (C) is a cc line sectional view which is the other open end of the packaging container,
5 is an enlarged cross-sectional view showing a main part of the packaging container in FIG. 1, wherein (A) is a cross-sectional view taken along the line dd as a locking portion, and (B) is an e- as a locked portion. e-line sectional view,
FIG. 6 is an enlarged cross-sectional view showing a main part of the packaging container in a closed state, where (A) is a cross-sectional view showing an overlap between one open end and the other open end of the packaging container, and (B). Is a cross-sectional view of the hinge portion, (C) is a cross-sectional view of the locking portion and the locked portion,
FIG. 7 is a process chart showing a method for producing a packaging container according to the present invention;
FIG. 8 is an enlarged process diagram showing a process of forming a kinks portion on a hinge portion;
[Explanation of symbols]
10 Packaging containers
12 Container body
12a First ridge (receiving section)
12b Second ridge
12c Step
12d fitting recess
12e Locking part
12e1 locking projection
13 Hinge
13A, 13B Folding part
14 Lid
14a fitting projection
14b flange
14c Locked part
30 resin sheet
32 mold
33 Covering member
33a Air intake duct
35 Pressing member
35a, 35b ridge
41 heater

Claims (8)

A container body having an opening and capable of storing an article to be packaged, a lid covering the opening of the container body, and a hinge portion provided between the container body and the lid. In resin material packaging containers,
When the lid is removed from the container main body, the container body, the hinge portion, and the lid are deployed so as to be arranged in this order, the arrangement direction is the Y direction, and the container main body and the lid when the lid is closed are overlapped. When the direction is a Z direction, and a direction orthogonal to both the Y direction and the Z direction is an X direction,
When the ceiling surface of the lid and the bottom surface of the container main body are developed so as to be parallel to the XY plane, the hinge portion developed in a plane is positioned between the lid and the container main body. And
The hinge portion includes a first flat portion, a fold portion, a second flat portion, a pair of folds extending in parallel in the X direction at intervals in the Y direction from the container body side toward the lid. A fold portion and a third flat portion are sequentially formed,
When the lid is overlaid on the container body, the second flat portion rises in the Z direction, and the third flat portion faces the first flat portion in the Z direction. And packaging container. The packaging container according to claim 1, wherein the folding habit portion is formed by linearly pressing a synthetic resin sheet forming a hinge portion. A receiving portion is provided around the opening of the container main body, and a flange overlapping the receiving portion when covering the opening of the container main body is formed at an edge of the lid, and the receiving portion has The packaging container according to claim 1, wherein when the flanges overlap each other, a step portion facing at least a part of an edge of the flange is provided. A locking projection is formed on the container body from the corner of the opening toward the center of the container body, and a locked portion is formed at the corner of the lid. The packaging container according to any one of claims 1 to 3, wherein the locked portion is inserted into a lower portion of the locking projection when the packaging container is placed on the packaging container. Using a mold having a main body forming concave portion and a lid material forming concave portion, a synthetic resin sheet is used to form a container main body, a lid covering the container main body, and a hinge portion located between the container main body and the lid. In a method of manufacturing a packaging container formed integrally,
(A) heating and softening a planar synthetic resin sheet;
(B) Using at least one of the air suction pressure and the air pressure, the softened synthetic resin sheet is brought into close contact with the main body forming concave portion and the lid material forming concave portion to form the outer shape of the container main body and the lid material. Process and
(C) At the same time as the step (b) or before or after the step (b), a linear pressing force is applied to the softened synthetic resin sheet located between the main body forming recess and the cover material forming recess. And forming a linear bent portion extending in a direction perpendicular to the direction in which the container body and the lid member are arranged between the container body and the lid member. The method for manufacturing a packaging container according to claim 5, wherein the crease portion is formed at two places in parallel. The mold has a flat surface between the main body forming concave portion and the lid material forming concave portion, and in the step (c), a synthetic resin is provided between the linearly extending convex portion and the flat surface. The method for manufacturing a packaging container according to claim 5, wherein the folded portion is formed by sandwiching a sheet. In the step (b), a locking projection is provided from the corner of the opening of the container body toward the center of the container body, and is locked to the corner of the lid by the locking projection. The method for manufacturing a packaging container according to any one of claims 5 to 7, wherein a locked portion is formed.

Images