JP2863903B2 - Sealing structure for packaging containers made of synthetic resin sheet material - 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 container body and a lid are formed of a synthetic resin sheet material, and is generally known as a lightweight packaging container used for storing eggs, for example. The sealing structure of a sheet-shaped molded container.

[0002]

2. Description of the Related Art Conventionally, in this type of container, the joint edge between a main body and a lid is generally stapled with a stapler in order to seal the container after storing contents such as eggs. It is. However, this stapling means has a problem that the opening operation is troublesome and the appearance is spoiled because the stapler must be removed at the time of opening.

[0003]

In order to solve such a problem, the inventor of the present invention has proposed that one end of the tape be removed along the container joining edge as disclosed in Japanese Patent Publication No. Hei 7-23125. A method is proposed in which the adhesive tape is attached to the joining edge with the ear formed so as to protrude toward the joint. In this method, the adhesive tape material is peeled from the container simply by pulling the ear portion at the time of opening, and the container can be opened.

[0004] However, in carrying out this prior invention, a new problem has been found that when the ear of the tape material is pulled, the ear may be torn off from the bonded portion of the joining edge of the container. This problem can be solved by making the material of the adhesive tape material thick and rich in toughness, but the adhesive tape material used for this type of container itself is very inexpensive. However, the cost cannot be increased, and it is required to use an inexpensive tape (for example, a vinyl thin film tape).

Accordingly, the present invention provides a sealing structure which can be easily and reliably peeled off from the joining edge of the container without tearing of the ear portion when opening, even when an inexpensive adhesive tape material is used for sealing. The main purpose is to provide

[0006]

In order to achieve the above object, the present invention takes the following measures. That is, in the container sealing structure according to the present invention, in a packaging container in which the container body 1 and the lid 2 are formed of a synthetic resin sheet material, the joining edge 4 of the packaging container body 1 and the lid 2 is formed. Is adhered and sealed in a U-shaped cross section from the outside with an adhesive tape 5, and at least one end of the adhesive tape material 5 is extended outward from both sides of the joining edge of the container, and a knob for peeling is provided. 5a, at least one corner portion 4a of the joining edge 4 of the container is cut in an inclined direction, and the adhesive surface between the adhesive tape material 5 and the joining edge 4 gradually increases proportionally from the joining start end. This is a structure formed so that

[0007]

When the container A constructed as described above is opened, the knob 5a of the adhesive tape 5 protruding out of the container is pinched by a fingertip and pulled out of the container to be peeled off. At this time, since the adhesive surface between the adhesive tape material 5 and the joining edge 4 is formed so as to gradually increase from the joining start end, when the knob 5a is pulled to separate the adhesive tape material 5, However, the peeling resistance does not increase sharply but increases gradually in proportion , so that the knob 5a does not break at the bonding start end portion with the container.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described below based on an embodiment shown in the drawings. FIGS. 1 to 3 show an embodiment in which the present invention is applied to a chicken egg container for individually storing ten chicken eggs. The container body 1 and the lid 2 are made of a synthetic resin sheet material. A container A is formed by integrally connecting and forming one edge so as to be foldable via a hinge 3. After the eggs are stored in the container A, the lid 2 is bent from the hinge portion 3 and polymerized on the container body, and the joining edge 4 facing the hinge portion 3 is formed using an adhesive tape material 5 having an adhesive surface formed on the inner surface. In order to wrap around the entire length in the longitudinal direction of the joining edge, the tape material 5 is extended from both ends of the joining edge 4 so as to be wrapped in the shape of a cross section U from the upper surface to the lower surface of the container joining edge 4. Is formed. Container A sealed in this way with adhesive tape material 5
Is opened, the knob 5a of the adhesive tape material 5 protruding outside the container is pinched by a fingertip and pulled toward the outside of the container (in the direction of the arrow in FIG. 3) to be peeled off.

According to the present invention, the joining edge 4 of the container A
Left and right corner portions 4a are cut in an inclined shape,
Thereby, the adhesive surface between the adhesive tape material 5 and the joining edge 4 is formed so as to gradually increase in proportion to the joining start end. With such a structure, when the knob 5a is pulled and the adhesive tape material 5 is peeled off, the tape material is not cut off due to a sharp increase in the adhesive force, so that the tape material can be easily and reliably peeled off.

The angle of inclination α of the corner portion 4a of the joining edge 4 is preferably 30 to 45 degrees, and when the adhesive tape material 5 is adhered, the angle of inclination is slightly small as shown on the right end side in FIG. It is preferable to expose the structure, but the structure is not necessarily specified. Further, in this embodiment, both ends of the adhesive tape 5 are extended from both ends of the joining edge 4 to form the peeling knob 5a, but it is needless to say that only one of them may be formed.

The embodiment shown in FIG. 4 shows a container without the hinge portion 3 of the container A shown in the above embodiment, that is, the container A in which the container body 1 and the lid 2 are separated. In this embodiment, both joining edges 4 and 4 of both bodies 1 and 2 are bonded and sealed using adhesive tapes 5 and 5, respectively. The sealing structure according to the present invention can be implemented not only at one side edge of the container A but also at both side edges. 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 the embodiments, but includes the constituent elements of the present invention and achieves the object of the present invention. The present invention can be appropriately modified and implemented within a range in which the following effects can be obtained.

In the embodiment shown in FIG. 5, both end corners 4a,
The shape of the inclined cutting portion 4a is formed in a wave-shaped inclination different from that of the above-described embodiment. As described above, the cut shape in the inclined direction according to the present invention does not need to be linear, but may be formed so that the adhesive area with the adhesive tape material 5 gradually increases from the outer end side. I just need to.

[0013]

As described above, the packaging container of the present invention is cut in the inclined direction of at least one corner of the joining edge of the container as described above, and the adhesive surface with the joining edge with the adhesive tape material is proportional to the joining start end. Since it is formed so as to increase gradually, the peel resistance force does not increase rapidly when pulling the knob part and peeling the adhesive tape material from the container, it will increase proportionally gradually. Thus, even when a relatively inexpensive thin-film adhesive tape material is used, the tape material does not break and is cut at the bonding start end portion with the container, so that it can be easily and reliably peeled off, and the container is opened. Can be performed easily, reliably and quickly with one touch.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a sealing structure according to the present invention.

FIG. 2 is a partially cut side view showing the sealing structure.

FIG. 3 is a partial plan view showing the sealing structure.

FIG. 4 is a partially cut-away side view corresponding to FIG. 2, showing another embodiment.

FIG. 5 is a partial plan view showing another embodiment and corresponding to FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Container main body 2 Lid 3 Hinge part 4 Joining edge 4a Inclined corner part 5 Adhesive tape material 5a Knob part

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-6-293374 (JP, A) JP-A-47-2287 (JP, A) JP-A-2-13522 (JP, U) JP-A-4-293 60886 (JP, U) Fully open 1979-49417 (JP, U) Fully open 1986-14671 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) B65D 85/00

Claims (1)

(57) [Claims] 1. A packaging container in which a container body 1 and a lid 2 are formed of a synthetic resin sheet material.
Edge 4 of the container and the lid 2 are wrapped and sealed in a U-shaped cross section from the outside by an adhesive tape material 5, and at least one end of the adhesive tape material 5 is outwardly from both sides of the joint edge 4 of the container. It is extended to form a knob 5a for peeling,
At least one corner portion 4a of the joining edge 4 of the container is cut in the inclined direction, and the adhesive surface between the adhesive tape material 5 and the joining edge 4 is formed so as to gradually increase in proportion to the joining start end. Sealing structure for packaging containers made of synthetic resin sheet material.