JPS5933812Y2 - sealed container - Google Patents

Description

[Detailed description of the invention] This invention relates to a sealed container in which the opening of the container is sealed by tightly welding a sealing film such as an aluminum film, and its purpose is to facilitate the opening operation of this type of container. That's what I said.

Traditionally, thermoformed sealed containers for coffee milk, honey, pudding, etc. have been used to make them easier to open.
A cutout piece is integrally extended from a part of the opening periphery provided around the outer periphery of the opening, and a notch is formed on the lower surface of the cutout piece where it is connected to the opening periphery, and this continuous portion is formed. By making the wall thinner, the resected piece was made easier to break from the periphery of the opening.

The above-mentioned conventional sealed containers have the advantage of having a relatively high sealing effect and being easy to use, but the material used to mold the container is limited to synthetic resin materials with physical properties that are easily broken, such as PS resin. Due to the limited number of resin materials that can be used, polyethylene terephthalate resin is used, which has excellent physical properties and properties such as content resistance, gas barrier properties, and moldability, but is resistant to breakage. I couldn't.

The present invention was devised so that polyethylene terephthalate resin, which has various excellent physical properties, can be used for this type of container. The continuous portion of the piece to the opening periphery is subjected to heat treatment, and this continuous portion is formed into a crystallized portion.

An embodiment of the present invention will be described below with reference to the drawings.

The drawings show an embodiment in which the present invention is applied to a coffee milk container. In the drawings, reference numeral 1 indicates a container integrally molded from polyethylene terephthalate resin.

This container 1 includes a main body 2 that forms a space for storing contents, and an opening periphery 4 that is disposed around the outer periphery of an opening 3 of the main body 2 and forms a neck and mouth located on a single flat surface. and a cutout piece 5 integrally extending outward from a part of the opening periphery 4.

Although the method for molding this container 1 is not particularly limited, injection molding is considered to be advantageous in view of the physical properties of the polyethylene terephthalate resin and the heat treatment described below.

However, injection blow molding is more advantageous when molding the container 1 into a bank shape, and
It goes without saying that vacuum forming may be performed from a sheet-like polyethylene resin material that has been axially stretched.

After the container 1 is formed, the base of the cutout piece 5 integrally provided with the opening periphery 4, that is, the portion connected to the opening periphery 4, is subjected to heat treatment 9 and formed into a crystallized portion 7.

When forming the crystallized portion 7 by this heat treatment 9, as in the illustrated embodiment, a shallow notch 6 is formed on the upper surface of the portion where the opening periphery 4 and the cutout piece 5 are connected, as a guide to make it easier to understand where the heat treatment 9 will be applied. It is best to form it in advance.

In this case, by providing the notch 6, some of the crystallized portions 7 become thinner, so the seven crystallized portions where the notches 6 are provided are particularly prone to breakage, and this causes cutting. This makes it possible to accurately control the location at which the piece 5 is to be separated.

On the top surface of the container 1, a sealing film 8 made of an aluminum laminated film or the like is cut along the outer shell line of the planar shape formed by the opening periphery 4 and the cut piece 5, and seals the opening 3. Welded as tightly as possible.

At this time, it goes without saying that the sealing film 8 is welded not only to the upper surface of the opening periphery 4 but also to the upper surface of the cut piece 5.

Since the present invention has the above-mentioned configuration, the part of the resected piece 5 connected to the opening periphery 4 is formed into the crystallized part 7 by the heat treatment 9, and the container is completed and placed in the hands of the consumer. to go into.

As is well known, when polyethylene terephthalate resin is crystallized by the heat treatment 9, the crystallized portion becomes significantly brittle compared to other portions.

Therefore, when opening the container according to the present invention, the tip of the resected piece 5 can be grasped with the fingertips and pulled upward.
easily breaks at the crystallized portion 7 and is separated from the opening periphery 4.

After cutting off the cutout piece 5 from the opening periphery 4, the cutout piece 5 is attached to the sealing film 8 in the same manner as in conventional containers of this type.
The sealing film 8 can be peeled off from the upper surface of the opening periphery 4 by pulling up together with the sealing film 8.

In addition, to form the crystallized portion 7, simply heat the continuous portion of the cut piece 5 and the opening periphery 4 to a desired temperature (approximately 140 to 180°C).
Since it is sufficient to heat the material using a heating wire or the like until the temperature reaches 100 degrees, and then leave it to cool slowly, molding is easy and the working time is extremely short.

By the way, when the notch 6 is shaped, the part where the notch 6 is shaped becomes thinner, so it is easier to receive the heat action of the heat treatment 9 than other parts, and crystallization occurs in a shorter period of time. Ru.

Furthermore, when this notch 6 is formed, a gap will be formed between the container 1 and the sealing film 8 where the notch 6 is not welded.
After cutting off the seal film 8, the operation of pulling up the cut piece 5 and peeling off the seal film 8 from the container 1 is carried out smoothly.

In particular, when the sealing film 8 starts to be peeled off from the container 1, the sealing film 8 is smoothly removed from the container 1.

This is because the opening periphery 4 near the notch 6 is not deformed during the cutting operation of the resection piece 5, and the welded portion of the seal film 8 with the upper surface portion of the opening periphery 4 near the notch 6 maintains a smooth surface. It seems to be the body.

In addition, when molding this notch 6, this notch 6
It is advantageous for molding to set it in the gate part.

As is clear from the above description, although the container is integrally molded with unbreakable polyethylene terephthalate resin, the present invention allows the resection piece to be easily broken and separated.
This allows the sealing film to be easily and smoothly peeled off, and since the container is integrally molded with polyethylene terephthalate resin, the contents can be stored and held safely.Furthermore, the molding operation is extremely easy, and many other features are possible. It has excellent effects.

[Brief explanation of drawings]

FIG. 1 is a vertical sectional view showing one embodiment of the present invention.
The figure is a plan view of the container with the seal film removed. Explanation of symbols 1: Container, 2: Main body, 3: Opening, 4:
Opening rim, 5: cut piece, 6: notch, 7: crystallized part,
8: Seal film, 9: Heat treatment.

Claims (1)

[Scope of utility model registration request] It is a sealed container in which an opening 3 of a container 1 is sealed by tightly welding a sealing film 8 made of aluminum film or the like, and an opening rim 4 is provided around the outer periphery of the opening 3 of a main body 2. A mouth and neck portion located on one flat surface is formed, a resected piece 5 is provided extending outward from a desired peripheral end of the opening periphery 4, and a portion of the resected piece 5 that is continuous with the opening periphery 4 is heated. A container 1 made of polyethylene terephthalate resin that is formed into a crystallized portion 7 by processing, and a sealing film 8 that is tightly welded to the top surface of the mouth of the container 10 to seal the opening 3 of the container 1. A sealed container consisting of