JP3396845B2 - Packaging container made of synthetic resin sheet - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging container in which a generally known synthetic resin sheet is bulged to form a container body and a lid body in a series, and small articles, eggs, and foods. For containers used to package and display items such as
The present invention relates to a packaging container made of a synthetic resin sheet, which is capable of maintaining a substantially sufficient hermeticity after the lid is closed.

[0002]

2. Description of the Related Art Containers for packaging and displaying small products, eggs, foods, etc. do not contaminate surrounding foods when packaging products such as chicken eggs that may be contaminated by Salmonella bacteria, etc. In addition, it is necessary to avoid contamination from the surroundings, and it is required that the container has a good sealing property in the closed posture. A conventional container formed by bulging a synthetic resin sheet material in such a case is roughly divided into a container body and a lid body, and an outer peripheral edge of an opening of a product housing recess of the container body is A continuous convex strip that can be fitted in an airtight manner with the outer peripheral edge of the lid body is provided, and a continuous groove or recessed step portion that can be fitted in an airtight manner with the convex strip is provided in the lid body. Occasionally, the structure in which the convex strip and the concave groove or the concave step portion are fitted to each other to maintain the airtightness is the same as the closed structure of the convex strip and the concave groove or the concave step portion, but the productivity is improved. For the purpose, there is a container having a structure in which the container body and the lid are made into one continuous body through a bent portion.

[0003]

Among such conventional packaging containers, in the former container in which the container body and the lid are separate bodies, the container body and the lid are separated in the packaging process. Since it is supplied to the conveyor, the work efficiency is unavoidably lowered, and there is a drawback that not only the number of man-hours increases in manufacturing, but also inventory management is troublesome. Further, in the latter container in which the container main body and the lid body are connected to each other through the bent portion, a slight improvement can be seen with respect to the increase in manufacturing man-hours and the increase in inventory management, which are seen in the former. In the packaging process, when the lid is lifted by the jig on the conveyor with the jig, and the lid is turned over to cover the body of the container and the lid is closed, the above-mentioned ridges and grooves or recessed steps are formed. However, there is a problem to be solved that each corner edge is caught, or the fitting may be loose and the work may not proceed smoothly in order to complete the airtightness.

Therefore, the inventor of the present invention has the same productivity, low price, and function as those of the conventional series of containers, and has excellent workability in packaging, and the container body and the lid body when closed. It is an object of the present invention to provide a packaging container made of a synthetic resin sheet, which has good sealing property, can improve reliability at any time, and can expect a stable packaging state.

[0005]

The structure of the packaging container of the present invention, which has been devised to achieve the above object, will be described with reference to the same reference numerals as the drawings showing the embodiments. A container for packaging in which a container body 1 that is bulged and molded and a lid body 2 that covers and seals the container body 1 are formed in series through a bent portion 5 on one side. One of the lid 2 and the product housing recesses 11 and 21
Is formed on the outer peripheral portion of the ridge 3 in the vertical direction and is continuous over the entire circumference in the circumferential direction.
The inner side wall surface 43 that is shaped and sized to fit in close contact with the outer side wall surface 33 and is continuous over the entire circumference.
Is formed, and the concave step portion 4 is recessed from the outer peripheral flange 41 surface on the inner peripheral surface of the protruding ridge 4a raised on the bent portion 5 side and on the free end edge 6 side facing the bent portion 5. On the inner peripheral surface of the recessed portion 4b and on the side orthogonal to the bent portion 5, the bent portion 5 side is high and the free end edge 6 side is lowered, and the recessed depths on the bent portion 5 side are shallow. Inclined concave portion 4 with deeper concave depth on the free edge 6 side
inner side wall surface 4 composed of an inner peripheral surface formed by d and 4d
3, the continuous ridge 3 formed on one side when the lid is closed
The outer peripheral surface on the side of the bent portion 5 and the inner peripheral surface of the protrusion 4a formed on the side of the bent portion 5 formed on the other side first face each other.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION In carrying out the present invention,
Using a synthetic resin sheet as a material, a predetermined product accommodating concave portion as a container is formed by blow molding means, vacuum molding means, or both of them as in the conventional case. Any kind of synthetic resin sheet can be used as long as it is a sheet material conventionally used for such a container, but if the synthetic resin sheet material is PET (polyethylene terephthalate) resin, waste materials can be recycled. Also, since the calorific value is small even when incinerated,
The damage to the incinerator is small, and the generation of harmful substances such as dioxins can be prevented to prevent pollution problems. Further, in carrying out the present invention, when the lid is closed, the convex strip 3 formed on one of the container body 1 and the lid 2 and the concave step 4 formed on the other side are in contact with each other. In the above, it is preferable that the small projections 32 and 46 or the small recesses that engage with each other be formed so that the closed state can be surely maintained without spontaneously opening the lid.

The container main body 1 is formed with a product-accommodating recess 11, but the shape may be any suitable for the product to be accommodated. In the first embodiment, the egg container is taken as an example, so
The figure shows a chicken egg container in which six recesses for accommodating the lower half of the chicken egg are arranged in two rows and three columns. However, the container of the present invention can be applied to containers other than the egg container, as illustrated in FIG.

[0008]

The details of the present invention will be described below with reference to the embodiments shown in the drawings. 1 is a perspective view showing an opened state of a first embodiment of the present invention, FIGS. 2 to 5 are a rear view, a plan view, a front view and a right side view, respectively, and FIG. 6 is a view in FIG. FIG. 7 and FIG. 8 are side views showing a state immediately before the lid is closed and a closed state, and FIGS. 9 and 10 are a longitudinal sectional view and a longitudinal direction in a side direction of the closed state. FIG.

The first embodiment shown in FIGS. 1 to 10 is
Inside the container body 1, there are 3 egg-retaining concave portions 11 2
A packaging container arranged in rows and capable of holding 6 eggs. In this embodiment, the container body 1 has six housing recesses 11
There are two pillars 12 for isolating each other from each other, and a partition wall 13 for suppressing the movement of eggs inside the pack and for increasing the rigidity of the container body. The post 1
A concave portion 14 that engages with the engaging protrusion 24 of the protrusion 22 of the lid 2 is formed on the top of 2. Further, a convex strip 3 having a trapezoidal vertical cross section is continuously formed on the outer periphery of the accommodating recess 11 so as to surround the accommodating recess 11, and the bent portion 5 at the lower end portion of the outer side wall surface of the convex strip 3 is formed. An outer peripheral flange 31 is formed so as to spread in the horizontal direction on the three sides excluding.

The lid 2 has a housing recess 2 that covers the upper half of the egg.
1 has two truncated cone-shaped protrusions 22 formed therein,
An engaging protrusion 24 is formed on the top of the tip of the protrusion 22. The engaging projection 24 has a conical surface with a small inclination so that it can be easily inserted into the concave portion 14, and a rising surface from the top has a conical surface with a steep inclination. The engagement projection 24 and the recessed portion 14 are formed in such a dimensional relationship that they can be fitted and positioned without a gap when the lid is closed, and the rigidity of the entire container when the lid is closed is increased. On the outer peripheral portion of the accommodating concave portion 21, a concave step portion 4 that fits into the convex line 3 and encloses the convex line 3 is continuously formed over the entire circumference. The recessed step portion 4 is formed on the side of the bent portion 5 such that the ridge 4 is raised upward.
On the inner peripheral surface of a and the free end edge 6 side facing the bent portion 5, the inner peripheral surface of the recessed portion 4b recessed downward from the surface of the outer peripheral flange 41 and the left and right sides orthogonal to the bent portion 5. The inclined projections 4c, 4c on the side of which the bent portion 5 side is high and the free end edge 6 side is lowered, and the recess depth on the bent portion 5 side is shallow on the extension thereof, and the recessed depth on the free end edge 6 side is extended. The structure is provided with the inner side wall surface 43 formed continuously on four circumferences by the inner peripheral surface formed in a series of surfaces by the inclined recessed portions 4d, 4d having a deeper depth.

Further, at the four corners of the ridge 3, linear long protrusions 32 are formed in the upper half of the outer peripheral surface in the height direction so as to extend horizontally in the lower half of the height direction. To form a horizontal groove-like recess on the inner peripheral surface of the recessed step portion 4 at the four corners thereof. At times, these small protrusions 32, ..., 46 engage with each other in the height direction to prevent relative movement in the opening direction.

Thus, when the lid is closed, the continuous ridge 3 formed on one side is the outer peripheral surface on the side of the bent portion 5 and the inner periphery of the ridge 4a raised on the side of the bent portion 5 formed on the other side. Sloped ridges 4 facing the surface first, and then formed on both left and right sides, with the bent portion 5 side higher and the free edge 6 side lower.
While making surface contact with c, 4c, in this extension, the recessed depth on the side of the bent portion 5 is shallow and the recessed depth on the side of the free end edge 6 is deepened, and in contact with the inclined recessed portions 4d, 4d in series, Finally,
It comes into surface contact with the inner peripheral surface of the recessed portion 4b that is recessed and formed on the free end edge 6 side facing the bent portion 5. Therefore, as compared with a container in which the four circumferences are fitted substantially at the same time as in the conventional container formed in the four circumferences, the container body 1 and the lid body are tightly made even if the fitting portions are tightly fitted to each other. The lid closing operation with 2 can be smoothly and sequentially fitted from the bent portion 5 side toward the free end edge 6 side.

[0013] In other words, in other words, when the product is packaged by the packaging container shown in the first embodiment, the container body 1
In the process of covering the lid body 2 with the lid body 2, when the concave step portion 4 on the lid body 2 side is externally fitted to the ridge 3 on the container body 1 side, at the time of starting the fitting, there is a clearance on the bent portion 5 side. And start fitting without difficulty, and gradually project the ridges 3 on both sides of the container.
The restraining force of the concave step portion 4 with respect to increases to reach the free end edge 6 side, and when the closing of the lid is completed, it can be fitted in a substantially completely sealed state without a gap. Therefore, when the closing work is automated by a machine, the work does not occur even though the fitting is almost hermetically closed, and the lid body is naturally released after the completion of the closing work to maintain the closed state. It is possible to avoid the occurrence of the situation that cannot be kept. In addition, in the container shown in the embodiment, after the lid is closed, the linear small projections 32, 46, provided at the four corners of the ridge 3 and the concave step portion 4 are engaged with each other and are stabilized. Keep the lid closed.

FIG. 11 shows a second embodiment, which is a packaging container for accommodating four chicken eggs. Further, FIG. 12 shows a third embodiment, which is a packaging container for accommodating ten chicken eggs. Similar to the case of the first embodiment, both of them have inclined ridges 4c, 4c formed on both side edge portions 42, 42 of the lid body 2 as described in the first embodiment. It is structured. In each of the first to third embodiments, projections are provided at the four corners of the top plate of the lid body 2 to prevent lateral slip and fall when the bottom of the container body 1 is stacked.

FIG. 13 is a perspective view showing the fourth embodiment.
The fourth embodiment is a container intended for packing general commodities other than chicken eggs, and the storage recesses 11 and 21 thereof have a simple shape without columns or partitions. Further, in this embodiment, the container main body 1 has a concave step portion 4 and the lid body 2 has a convex stripe 3.

Although the embodiments considered to be typical of the present invention have been described above, the present invention is not necessarily limited to the structures of these embodiments. For example, the entire shape of the container is limited to a square shape. However, the present invention can be similarly applied to a container having a circular shape or an oval shape, and the lid body is provided with the ridge or a concave step portion that fits with the ridge, and the product accommodating concave portion formed in the container body. It can be carried out by appropriately modifying it within a range in which the constitutional requirements referred to in the present invention are achieved, the object referred to in the present invention is achieved, and the effects of the invention described below are achieved. It is a thing.

[0017]

As is apparent from the above description, in the packaging container formed of the sheet-shaped material according to the present invention, the product accommodating recess is provided in either one of the container body and the lid. An outer peripheral portion of which is formed with a protruding ridge that extends in the vertical direction and is continuous over the entire circumference in the circumferential direction, and on the other side, an inner side that is shaped and sized to fit closely to the outer side wall surface of the ridge. A concave step portion that is provided with a wall surface and that is continuous over the entire circumference is formed, and the concave step portion has an inner peripheral surface of a protrusion raised on the bent portion side and an outer circumference on a free end edge side that faces the bent portion. The inner peripheral surface of the recessed part that is recessed from the flange surface,
On the side orthogonal to the bent portion, an inclined ridge having a higher bent portion side and a lower free end edge side and an inclined recessed portion having a shallow recess depth on the bent portion side and a deep recess depth on the free end edge side are provided. Since the inner side wall surface including the formed inner peripheral surface is provided, when the lid is closed, the outer peripheral surface on the bent portion side of the continuous ridge formed on one side and the bent portion side formed on the other side stand upright. The inner peripheral surface of the raised ridge first faces,
Then, while being surely in surface contact with the inclined ridges that are formed on both the left and right sides and whose bending portion side is high and the free end edge side is low, they are formed on this extension.
A series of surface contact is made with the sloped recesses where the depth of the recess on the side of the bent part is shallow and the depth of the recess on the side of the free end is deep, and finally the recessed part formed on the side of the free end facing the bent part. It comes into surface contact with the inner peripheral surface. Therefore, the concave-convex fitting portion does not fit the four circumferences almost at the same time as the conventional container formed on the same plane in the entire four circumferences.
Even if the container is made so tight that the fitting parts are almost in close contact with each other, the closing operation of the container body and the lid body can be performed very smoothly and sequentially from the bent portion side to the free edge side. Can be fitted. Therefore, even when the lid-closing work is automated by a machine, the pressing resistance of the lid body is not temporally simultaneous but sequential, so that there is an advantage that it can be easily and surely caused without a work failure.

Further, a small projection and a small projection or a small projection which are engaged with each other when the lid is closed are provided on the facing contact surfaces of the ridge formed on either the container body or the lid and the concave step formed on the other. If a dent is formed, the small projections and the small projections or the small dents that engage with each other should engage with each other to ensure that the closed state is maintained without spontaneously opening the lid. There is an advantage that can be.

[Brief description of drawings]

FIG. 1 is a perspective view of a container according to a first embodiment with a lid open.

FIG. 2 is a rear view of the same lid opened state.

FIG. 3 is a plan view of the same lid opened state.

FIG. 4 is a front view of the same lid opened state.

FIG. 5 is a right side view of the same lid opened state.

6 is a cross-sectional view taken along the line AA shown in FIG.

FIG. 7 is an enlarged side view showing a state immediately before the lid is closed.

FIG. 8 is an enlarged side view showing a closed state.

FIG. 9 is a side view of the central longitudinal section in a closed state.

FIG. 10 is a longitudinal cross-sectional view in a closed state.

FIG. 11 is a perspective view of the container according to the second embodiment with the lid open.

FIG. 12 is a perspective view of the container of the third embodiment in an open state.

FIG. 13 is a perspective view of the container of the fourth embodiment in an open state.

[Explanation of symbols]

1 container body 11 Product storage recess 2 lid 21 Product storage recess 3 convex stripes 31 Peripheral flange 32 linear small protrusions 33 Outer side wall surface 4 concave step 41 Outer peripheral flange 43 Inner side wall surface 46 linear small protrusions 4a ridge 4b Recessed part 4c inclined ridge 4d inclined recess 5 Bending section 6 free edge

Front page continued (58) Fields surveyed (Int.Cl. ⁷ , DB name) B65D 1/26 B65D 43/16 B65D 77/20 B65D 85/32

Claims (2)

(57) [Claims] 1. A container body (1) and a lid body for covering and sealing the container body (1) by bulging a synthetic resin sheet material.
(2) is a packaging container that is formed in series through the bent portion (5) on one side, and these container body (1) and lid (2)
On either one of the above, a ridge (3) is formed on the outer peripheral portion of the product accommodating recesses (11) and (21) that protrudes in the vertical direction and is continuous over the entire circumference in the circumferential direction. The inner side wall surface (43) is shaped and sized to fit closely to the outer side wall surface (33) of the ridge (3) to form a continuous stepped portion (4) over the entire circumference. The recessed step portion (4) has an inner peripheral surface of the ridge (4a) raised on the bent portion (5) side and an outer peripheral flange (6) on the free end edge (6) side facing the bent portion (5). 41) The inner peripheral surface of the recessed portion (4b) recessed from the surface and a slanted ridge in which the bent portion (5) side is higher and the free end edge (6) side is lower on the side orthogonal to the bent portion (5). Formed by (4c) and (4c) and inclined recesses (4d) and (4d) that have a shallow recess on the bent part (5) side and a deep recess on the free edge (6) side. The inner side wall surface (43) consisting of the inner peripheral surface is formed on one side when the lid is closed. The outer peripheral surface of the ridge (3) on the bent portion (5) side and the inner peripheral surface of the ridge (4a) formed on the other bent portion (5) side first face each other. Packaging container made of synthetic resin sheet. 2. Small projections (3) that engage with each other when the lid is closed, at the portions of the ridge (3) and the concave step (4) that are in contact with each other.
The packaging container made of a synthetic resin sheet according to claim 1, wherein 2) and (46) are formed.