JPH10114381A - Egg container made of synthetic resin sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the suction arrangement on a conveyor in an egg packaging work by eliminating generation of warp deformation after an egg container is manufactured, and to efficiently perform the packaging work by solving an accident in closing a lid in an upside-down condition. SOLUTION: In an egg container, a container body 1 having a plurality of egg storage recessed parts 3, 3 and a lid body 2 are formed in series in a foldable manner through a folding line 9 in one side edge part by swelling the synthetic resin sheet stock. A recessed groove 7 or a projected rib are formed along the longitudinal direction of the container in flat parts 4... on the closer side to the folding line 9 out of flat parts 4... and 5... to form a boundary part between the recessed parts 3, 3 adjacent to each other of the egg storage recessed parts 3, 3 formed on either or each of the container body 1 and the lid body 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of bulging a synthetic resin sheet material, which is well known as an egg container, and has a structure in which a plurality of housing recesses are arranged and a lid is folded and packaged on the container body. The present invention relates to a chicken egg container.

[0002]

2. Description of the Related Art As an example of a conventional container formed by bulging such a synthetic resin sheet material, the structure of a chicken egg container shown in FIG.
The container body 21 and the lid 22 are arranged with a plurality of concave portions 23 for accommodating chicken eggs. A shallow groove-shaped fold line 24 is formed at the boundary between the container body 21 and the lid 22, and the opposite side of the fold line 24 of the arranged concave portions 23 is a free end edge, and At times, the outer peripheral edge 25 is used to fix the container body 21 and the lid 22 together. The boundary between the concave portions 23 adjacent to each other forms a flat surface portion 26.

[0003] The outline of the conventional product packaging in a molded container using this kind of synthetic resin sheet material is as follows. All the operations are automatically performed by a conveyor and a robot, and the egg containers are accumulated at the starting point of the conveyor. One egg container is picked up by the suction arm and placed on the conveyor, and then the eggs are stored in the recess 23 on the container body 21 side. The egg container containing the eggs proceeds on the conveyor, and the outer edge 25 of the lid 22 serving as the free end is lifted by the lever, and is bent at the fold line 24 and falls over the container body 21. Then, the container body and the lid are superimposed, and a tape-like sealing material is stuck on the outer peripheral edge portions 25 of both sides, or is closed with a stapler and sealed.

[0004]

The above-mentioned conventional egg container made of a synthetic resin sheet has a thin material sheet from the standpoint of cost reduction and forms a basis for maintaining the overall shape by connecting a plurality of concave portions 23. The flat surface portion 26 has a disadvantage that it has a shape that is close to the flat surface of the character and is susceptible to bending moment and is easily bent, and is warped upward as shown in FIG. 6 due to residual stress or the like during molding.

[0005] A problem derived from such a warping deformation is that when a container is suctioned and arranged on a conveyor,
In a state where a large number of containers are accumulated, the concave portions 23 of the container are stacked in a state where they are combined with the concave portions of the container of the next layer. As a result, the accumulated containers are polymerized and adhered, and one by one from the accumulation of the containers. It becomes difficult to separate by suction.
Further, the warped container is entirely lifted without being bent at the fold line 24 when the automatic machine is folded down and closed,
There was a problem to be solved that a smooth closing operation could not be performed.

Accordingly, the present invention solves the above-mentioned problems of the prior art, and eliminates the occurrence of warpage after manufacturing a container without significantly changing manufacturing equipment and processes even when a relatively thin material sheet is used. A plastic resin sheet egg container that eliminates the accumulated containers and prevents them from adhering to each other, facilitates the suction arrangement on the conveyor, eliminates scandals when the lid is closed, and enables efficient packaging. It is intended to provide.

[0007]

In order to achieve the above object, the structure of the egg container made of synthetic resin sheet of the present invention, which has been adopted as means for achieving the object, has a plurality of egg accommodation recesses 3 formed by bulging a synthetic resin sheet material. An egg container made of a synthetic resin sheet in which a container body 1 and a lid 2 are formed at one side edge thereof so as to be foldable via a bending line 9 in series, and the container body 1 and the lid 2 Concave portions 3 adjacent to each other of the egg containing concave portions 3 formed on one or both of them.
Of the flat surface portions 4, 5.
A concave groove 7 or a convex rib 8 is formed in the flat surface portion 4 on the side close to the bending line 9 along the longitudinal direction of the container.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In carrying out the present invention,
The synthetic resin sheet material is shaped by blow molding. The blow molding mold may use a newly manufactured mold so that the above-mentioned synthetic resin sheet egg container can be molded,
Using a conventional mold, a rod material having dimensions corresponding to the width and length of the convex rib 8 is temporarily attached to a predetermined portion of the mold where the convex rib 8 is to be formed with an adhesive. Can be. The formation of the concave groove 7 can be easily realized by digging a groove having a size corresponding to the width and length of the concave groove 7 in a predetermined portion of the conventional mold.

The concave grooves 7 or the convex ribs 8 formed in the flat surface portions 4... 5 are formed on both sides or one side formed near the bending line 9 at the boundary between the container body 1 and the lid 2. The flat surface portions 4 are provided in parallel with the longitudinal direction of the container. Alternatively, along with the flat surface portions 4, the flat surface portions 5 near the outer edge 10 of the container body 1 and the lid 2 serving as free ends may be provided along the longitudinal direction. Further, the lid 2 is provided with a concave groove 7 or a convex rib 8 and the container body 1.
May be provided with a convex rib 8 or a concave groove 7, respectively, so that the convex rib 8 is fitted into the concave groove 7 when the lid is closed. Further, a concave groove 7 or a convex rib 8 may be provided also on the flat surface portion 6 at the intermediate portion between the successively adjacent egg accommodating concave portions 3 and 3.

When the concave grooves 7 or the convex ribs 8 are formed in the flat surface portions 4,..., The formed concave grooves 7 and the convex ribs 8 have a reinforcing effect of resisting a bending moment. The strength of the surface portions 4, 5... In the longitudinal direction is increased to prevent the flat surface portions 4, 5,... From being distorted. Never warping. Therefore, the trouble in the packaging operation due to the warpage is eliminated.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below based on an embodiment shown in the drawings. FIG. 1 is a perspective view of a first embodiment of the egg container of the present invention, FIG. 2 is a sectional view of the first embodiment shown in FIG. 1, and FIG.
FIG. 4 is a perspective view of the third embodiment.

FIG. 1 shows an outer shape, and FIG.
The embodiment is a container for accommodating eight chicken eggs. Container body 1
Each of the lids 2 is formed with two rows of egg storage recesses 3, 3... Having a depth corresponding to about half of the egg, and a boundary between the adjacent egg storage recesses 3, 3,. , And a flat surface portion 4 near the outer edge 10 which is a free end edge.
Are respectively formed in the distribution. Further, in the middle part of the egg storage recesses 3, 3, ... arranged in two rows, the upper surface of an intermediate wall dividing the two rows is a flat surface portion 6. In the first embodiment, grooves 7 are formed in the flat surface portions 4 on both sides of the bending line 9 along the longitudinal direction. In the figure, an example of only the concave groove 7 is shown, but a convex rib 8 may be used instead of the concave groove 7.
The container body 1 side may be a concave groove 7 and the lid 2 side may be a convex rib 8, or vice versa.

Although illustration is omitted, depending on the type of the container, in consideration of sticking a sticker for displaying an adhesive product on the side surface as well as the upper surface of the lid 2 after the product is packaged,
The side surface of the lid 2 on the side of the folding line 9 is a continuous inclined side wall, and there is a container lacking the flat surface portion 4 on the side of the folding line 9 on the lid 2 side. In this case, the concave groove 7 is formed only in the flat surface portion 4 on the container body 1 side, but this still has a sufficient effect for preventing the container from warping.

FIG. 3 shows the structure of the second embodiment. This second
The embodiment is a container for accommodating 10 chicken eggs, and five egg-containing recesses 3, 3,... Are formed in each of the container main body 1 and the lid 2 in two rows, and the same as in the first embodiment. A triangular flat surface portion 4 is formed near the folding line 9 of the container, and a flat surface portion 5 is formed near the free end near the outer edge portion 10. In this embodiment, the reinforcing grooves 7 or the convex ribs 8 are also formed on the flat surface portions 4 and also on the flat surface portions 5. In the illustrated second embodiment, a concave groove 7 is formed on the container body 1 side, and a convex rib 8 is formed on the lid 2 side. The formation site of the concave groove 7 or the convex rib 8 may be replaced with the illustrated example. In addition, all the grooves may be formed only by the concave grooves 7 or the convex ribs 8, and in any case, a sufficient effect for preventing deformation after molding of the container, including the free edge, is exhibited, and defective deformation such as warpage is caused. Although the object of the present invention is achieved by having a shape with a small number of holes, in the illustrated example, when the lid is closed, the concave groove 7 of the container body 1 and the convex rib 8 of the lid 2 are fitted to each other, and the lid is closed. It has the feature of being stable.

FIG. 4 shows the structure of the third embodiment. In this embodiment, the concave groove 7 or the convex rib 8 is connected to the above-mentioned flat surface portion 4 and flat surface portion 5. 6 also have concave grooves 7 respectively. The third embodiment is characterized in that deformation after molding is further reduced, and scandals in the packaging operation are reduced.

Although the embodiments which are considered to be representative of the present invention have been described above, the present invention is not necessarily limited to only the structures of these embodiments, but includes the structural requirements of the present invention and is referred to as the present invention. The present invention can be implemented by appropriately modifying it within the range of achieving the object and having the following effects.

[0017]

As is apparent from the above description, the egg container made of synthetic resin sheet of the present invention has a flat surface portion formed and distributed at the boundary between the egg-containing recesses provided at a plurality of locations. Since it has a structure in which a concave groove or a convex rib for reinforcement is provided in parallel with the longitudinal direction, there is no deformation defect such as warping upward after molding. Therefore, when the egg containers are prepared in a stacked state during the packaging operation, the layers of the stacked containers are prevented from polymerizing and sticking to each other, and the suction arrangement on the conveyor can be easily and accurately picked up one by one. it can. Also, since there is no warping of the container when the lid is opened, when the lid is lifted by the lever when closing the lid with an automatic machine, it can be easily bent at the bent part and cover the container body, and Since no scandal at the time of the lid is generated, there is a remarkable effect that the working efficiency can be remarkably increased in combination with the simplification of the suction arrangement.

Furthermore, the manufacturing apparatus and process do not need to be drastically changed at the time of manufacture, and even if a relatively thin material sheet is used as a material, the problems and problems of the conventional example can be solved. Therefore, the effect of reducing costs in terms of materials and manufacturing costs can also be expected.

[Brief description of the drawings]

FIG. 1 is a perspective view of a first embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA in FIG.

FIG. 3 is a perspective view of a second embodiment.

FIG. 4 is a perspective view of a third embodiment.

FIG. 5 is a perspective view of a conventional container.

FIG. 6 is a side view of a conventional container.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Container main body 2 Lid 3 Chicken egg accommodating recessed part 4 Flat surface part on the bending line side 5 Flat surface part on the free edge side 6 Flat surface part in the middle part between the egg accommodating concave parts 7 Recessed groove 8 Convex rib 9 Bending line 10 Peripheral edge Part P Egg container made of synthetic resin sheet

Claims (2)

[Claims] 1. A container body (1) having a plurality of egg housing recesses (3) by expanding and molding a synthetic resin sheet material and a lid.
(2) is a chicken egg container made of a synthetic resin sheet formed in one side edge portion so as to be freely foldable via a folding line (9), the container body (1) and the lid (2 ) The egg-containing recess (3) formed on one or both of the
Of the flat surface portions (4), (5) forming a boundary between the adjacent concave portions (3), (3), the bending line (9)
An egg container made of a synthetic resin sheet, wherein a concave groove (7) or a convex rib (8) is formed on a flat surface portion (4) on the side close to the container along the longitudinal direction of the container. 2. A flat surface portion of the flat surface portions (4), (5), which is close to the free edge side of the container body (1) and the lid (2).
(5) The egg container made of a synthetic resin sheet according to claim 1, wherein a concave groove (7) or a convex rib (8) is also formed along the longitudinal direction.