JP2706656B2 - Structure of container body and synthetic resin container using the container body - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a synthetic resin container that can be easily opened.

(Prior Art) Hereinafter, a synthetic resin container containing tofu as a conventional technique will be exemplified, but the present invention is not limited to this.
In addition, the present invention can be generally applied to a synthetic resin container for storing contents that need to be sealed, such as food and medicine.

The container for storing the tofu has a flange formed on the outer periphery of the synthetic resin container main body. After the tofu is stored in the container main body, a synthetic resin lid film is welded to the flange by ultrasonic wave, heat or the like. Closed.

(Problems to be solved by the invention) However, the above-mentioned conventional synthetic resin container has the following problems.

Tofu containers must be completely sealed to prevent water leakage during transportation.

For this reason, conventionally, the film was welded twice and completely sealed.

However, although the sealing for welding the film twice is complete, it is difficult to peel off the lid film by hand and open it.Therefore, the film is cut open using a knife or knife. That was the current situation. Such cutting with a blade is time-consuming and dangerous, and is therefore a serious problem especially in places where large-scale processing such as school lunches is performed.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a container which can be easily opened by picking and pulling a lid film by hand.

(Means for Solving the Problems) In order to achieve the above object, the present invention is configured as follows.

That is, the present invention relates to a flange formed on the outer periphery of the opening end of the container body, an intermediate film adhered to the inner surface and the flange of the container body, a lid film welded to the intermediate film of the flange, and a welded portion of the flange. And an opening notch formed in the intermediate film on the inner periphery.

The most important feature of the present invention is that the intermediate film is bonded to at least the flange of the container body, and the intermediate film is peeled off from the container body together with the lid film so that the intermediate film can be easily opened, and at the same time, the lid film is formed. Is welded to the intermediate film so that the sealing is completely performed.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

In the following, a synthetic resin container containing tofu will be described as an example, but the present invention is not limited to a container containing tofu, and other foods, medicines, and also need to be sealed. Including various synthetic resin containers. In the present invention, the term "synthetic resin" includes, for example, a material obtained by coating and laminating a synthetic resin on paper.

FIG. 1 (a) is a perspective view showing a container body according to one embodiment of the present invention, and FIG. 1 (b) is an AA of FIG. 1 (a).
It is sectional drawing.

In the figure, a peripheral flange 2 is formed at an open end of a container body 1 made of a synthetic resin. An intermediate film 3 is adhered to the upper surface of the flange 2. The intermediate film 3 is thinner than the synthetic resin film forming the container body 1 and is bonded by an adhesive, and the bonding strength is weaker than the welding strength described later. At one corner of the flange 2, a holding portion 5 having a cutout groove 4 is formed.

FIG. 2 is a cross-sectional view showing one embodiment of the synthetic resin container according to the present invention. After the contents 6 such as tofu are stored in the container body 1 shown in FIG. 7 is obtained by welding W to the intermediate film 3 by ultrasonic wave, heat or the like.

In the embodiment shown in FIGS. 1 (a), (b) and FIG. 2, when the cover film 7 is pulled up by holding the holding portion 5 at the time of unsealing, the bonding between the intermediate film 3 and the flange 2 is improved. Is weaker than the welding strength W between the intermediate film 3 and the lid film 7, so that the lid film 7 and the intermediate film 3 are peeled off integrally.

Next, a container body and a synthetic resin container according to another embodiment of the present invention will be described.

FIG. 3 (a) is a perspective view showing a container body according to another embodiment of the present invention, and FIG. 3 (b) is a sectional view taken on line B- of FIG. 3 (a).
It is B sectional drawing.

In the figure, a peripheral flange 12 is formed at an open end of a container body 11 made of a synthetic resin. An intermediate film covers the entire inner surface of the container body 11 and the upper surface of the flange 12.
13 are glued. The intermediate film 13 is thinner than the synthetic resin film forming the container body 1 and is bonded by an adhesive, and the bonding strength is weaker than the welding strength described later. At one corner of the flange 12, a holding portion 15 having a cutout groove 14 is formed. An opening notch 18 is provided on the flange 12 of the intermediate film 13 in a circumferential shape.

FIG. 4 is a cross-sectional view showing one embodiment of the synthetic resin container using the container body 11 shown in FIG. 3, and the container body 11 shown in FIG. 3 contains contents 16 such as tofu. Thereafter, the lid film 17 is welded W to the intermediate film 13.
In this case, the welding W is located on the outer periphery of the opening notch 18.

The embodiment shown in FIG. 3 and FIG.
When the picker 15 is picked up and the lid film 17 is pulled up, the bonding strength between the intermediate film 13 and the flange 12 is lower than that of the welding W between the intermediate film 13 and the lid film 17, so that
The lid film 17 and the intermediate film 13 are integrally peeled off. In this case, open the intermediate film at the opening notch 18.
13 is torn off, so cover film 17 and intermediate film
The 13 peripheral portions are easily peeled off integrally.

The container main body 1 shown in FIGS. 3 (a) and 3 (b) is manufactured by the following steps as an example.

That is, the material forming the container body 11 is a sheet of synthetic resin such as polypropylene having a thickness of about 0.5 mm,
An intermediate film 13 made of a synthetic resin such as thin polypropylene with a thickness of about 0.03 mm by applying an adhesive to one side of this sheet 13
Are bonded to form a double sheet, and then the container body is formed by a vacuum forming method or the like.

It should be noted that welding by ultrasonic waves, heat, or the like is performed only once circumferentially, and includes welding performed several times circumferentially to ensure sealing.

Next, a method of forming the opening notch 18 formed in the intermediate film 13 of the container body 11 will be described.

FIGS. 5 and 6 show an example of a molding method for forming the opening notch 18 in the vacuum molding of the container body 11.

In the molding method shown in FIG. 5, a step 21 is formed in the flange forming portion of the female mold 20 for forming the container body 11, and the step 21 is used to form a step in the flange 12 of the container body 11 and the intermediate film 13. To form. By this step, the intermediate film 13 becomes fragile and becomes the opening notch 18. In FIG. 4, reference numeral 22 indicates a female type, and reference numeral 23
Indicates one of the vacuum suction holes formed in the female mold 20.

In the molding method shown in FIG. 6, a V-shaped small groove 31 is formed in the female mold 30 and the flange 12 of the container body 11 and the intermediate film 13 are evacuated from the small groove 31 by a vacuum suction hole 32. A V-shaped small groove is formed in the groove. These small grooves weaken the strength of the intermediate film 13 to form the opening notch 18.

On the other hand, FIG. 7 shows a method of forming an opening notch after vacuum-molding the container body 11.

A large number of such synthetic resin container bodies are simultaneously molded by a molding machine. That is, many container bodies are simultaneously molded from one large sheet. For this reason, the ordinary molding process of the synthetic resin container main body includes a step of cutting a large number of container main bodies molded into one sheet into individual container main bodies. The method of forming the opening notch by the cutting blade described below is performed simultaneously in the step of cutting the plurality of container bodies into individual container bodies.

In the figure, one platform 40 is fixed, and
Is formed with a V-shaped groove 41. The other table 42 moves up and down, and this table 42 is provided with an opening notch forming blade 43 and a cutting blade 44 having a shape adapted to the groove 41. A sheet in which a number of container bodies are formed is sandwiched between a fixed table 40 and a table 42 that moves up and down, and the table 42 is lowered to separate and cut into individual container bodies 11, and at the same time, an opening notch forming blade 43 is formed. Thus, only the intermediate film 13 is cut or an opening groove is formed in the intermediate film 13 to form an opening notch 18.

The above is one embodiment of the present invention, and the present invention is not limited to the above-described embodiment in use, material, shape, and other points of the container.

(Effect of the Invention) According to the container of the present invention, when the lid film is lifted, the lid film and the circumferential intermediate film are integrally peeled off from the container main body, or the lid provided with the opening notch does not cover the lid film. Since the body film and the intermediate film are integrally peeled from the container body along the opening notch, the opening can be easily and safely opened without using a knife or the like.

In the case where the container body is formed by using a double-laminated synthetic resin sheet, a synthetic resin container that can be easily opened can be obtained at low cost.

Furthermore, in providing an opening notch, in the case of providing a step of a mold for molding or forming an opening notch by a cutting blade in a cutting process, it is not necessary to make a special change to a conventional molding machine. The container body can be processed at low cost and in a short time.

[Brief description of the drawings]

1 (a) is a perspective view of a container body according to an embodiment of the present invention, FIG. 1 (b) is a sectional view taken along line AA of FIG. 1 (a), and FIG. 2 is FIG. 3 (a) is a sectional view of a container body according to another embodiment of the present invention after the contents are accommodated in the container body shown in FIG. 3, and FIG. 3 (b) is a sectional view of FIG. 3 (a). FIG. 4 is a cross-sectional view of the container body of FIG. 3 after the contents are accommodated, FIG. 5 is a cross-sectional view illustrating an embodiment of the opening notch forming means, FIG. Is a cross-sectional view for explaining an embodiment of another forming means of the opening notch, and FIG. 7 is a cross-sectional view showing an embodiment for forming the opening notch after molding the container body. 1: Container body, 2: Flange, 3: Intermediate film 4: Notch groove, 5: Holding part, 6: Contents 7: Lid film, W: Welding, 11: Container body 12: Flange, 13: Intermediate film 14: Notch groove, 15: Holder, 16: Contents 17: Lid film, 18: Opening notch 20: Female, 21: Step, 22: Male 23: Vacuum suction hole, 30: Female, 31: Small groove 32: Vacuum suction hole, 40: Stand, 41: Groove 42: Stand, 43: Opening notch forming blade 44: Cutting blade

Claims (4)

(57) [Claims] 1. A container body for use in a synthetic resin container having a flange formed on an outer periphery of an opening end of the container body and a lid film welded to the flange, wherein a circumferential member is formed on the flange of the container body. A structure of a container body, characterized in that an intermediate film is adhered and a peripheral opening notch is provided in the intermediate film. 2. A flange is formed on the outer periphery of the open end of the container body, and an intermediate film is adhered to the flange of the container body.
A synthetic resin container characterized in that a peripheral opening notch is provided in the intermediate film, and a lid film is welded to the outer periphery of the intermediate film beyond the opening notch. 3. The container body structure according to claim 1, wherein the adhesive strength of the intermediate film is made weaker than the welding strength of the base lid film. 4. The synthetic resin container according to claim 2, wherein the adhesive strength of said intermediate film is made weaker than the welding strength of said lid film.