JPS62251362A - Sealing vessel and sealing method thereof - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a sealed container for storing fresh confectionery and the like while shielding it from the outside air, and a method for sealing the same.

[Conventional technology]

Traditionally, foods such as fresh sweets that have to be stored for a relatively short period of time from the manufacturer to the consumer can suffer from deterioration and discoloration due to contact with outside air, especially oxygen, which can lead to a decline in product value. In order to eliminate the cause of the problem, it is common practice to store fresh sweets, etc. individually or in groups in non-ventilated containers, and tape the fittings of the containers with adhesive tape. . However, in recent years, even short-term shelf-stable foods such as fresh sweets have been required to have even higher shelf life as distribution channels and markets expand. In particular, when it comes to famous products such as food products, the problem of preserving their freshness, especially their flavor, including taste and aroma, has become a focus of attention, and demands have increased, especially for barrier properties against oxygen, which impairs their shelf life. Answer this request1
One method is to install an oxygen scavenger (Ageless, trade name, Mitsubishi Gas Chemical Co., Ltd.), which reacts with and absorbs oxygen present in the atmosphere inside the container, in a container that has no air permeability. has been used.

However, even with this method, as long as the material of the container itself has gas permeability, particularly oxygen permeability, the influence of oxygen penetration on the food cannot be ignored. Furthermore, even if the container body is made of metal, oxygen may penetrate through the tape or adhesive used for the fitting portion. This type of container is usually molded from resin, but resins with high gas barrier properties that can solve the above-mentioned problems have recently come on the market. Since these resins exhibit high gas barrier properties even when the thickness is extremely reduced, they have come to be used as containers for confectionery and the like, which do not require much cost.

[Problem that the invention seeks to solve]

As mentioned above, the resin with high gas barrier properties allows the i! Even if containers are made to package fresh confectionery, etc., which are easily damaged, if ordinary adhesive tape or adhesive tape is used for the fitting part, there are problems such as oxygen entering through the tape or adhesive. .

In addition, when removing the above-mentioned adhesive tape from a container containing individual sweets, etc., the adhesive strength is strong compared to the light weight of the container itself, so it may be difficult to remove the tape or the container may be Problems such as excessive force applied to the container when gripping the container deform the container and damage the contents have arisen.

Therefore, the present invention has been made in view of the above-mentioned problems, and provides a sealed container and a sealing method thereof, in which the gas permeability of the sealing portion of the fitting portion between the bottom of the container and the lid is low and the seal can be easily removed. The purpose is to

[Means for solving problems]

In the sealed container of the present invention, the container is formed of a gas-impermeable resin, and a heat-shrinkable ring-shaped band that is also gas-impermeable is covered at the fitting portion between the bottom of the container and the lid. The fitting portion is sealed (adhered, hermetically sealed) by heating and shrinking.

Furthermore, the fitting portion of the container is banded by heating and shrinking a thin film band made of a heat-shrinkable gas-impermeable resin without using an adhesive or the like.

[Effect]

When the bottom part and the lid are formed in a vertically fitting manner, a ring-shaped heat-shrinkable thin film band softens and adheres to the horizontally overlapping fitting part from above in accordance with the shape of the overlapping part, and the softened band It fits tightly into the gap of the fitting portion to the extent that the membrane surface is not torn, so as to clog the gap.

Also, the sealed seal band is tightly attached by the tightening force of the ring that is shrunk due to the heat shrinkage of the material, and it has no adhesive properties.

Once a portion of the ring is severed, the radial tension is lost and it very easily falls off the seal. Therefore, when the ring is cut using the eight pieces provided at the intermediate positions of the band, the fitting portion of the container returns to the free disassembly state before sealing.

In addition, when it comes to sealing with a seal band, a band having a circumference that almost matches the outer circumference of the fitting part between the bottom of the container and the lid is hung over the fitting part and passed, for example, in a hot air stove for a certain period of time. This causes the band to contract. In this case, even if the container and the band are made of the same material, the thickness of the band is, for example, about one-tenth of the material thickness of the container, so if the temperature and heating time are controlled to correspond to the shrinkage of the thickness, the thickness of the band alone will be reduced. Contraction occurs.

〔Example〕

The drawings all show embodiments of the present invention, and the same symbols in the drawings represent the same members. In FIG. 1, l is the bottom of a container molded from a gas-impermeable resin, 2 is the lid of the container,
3 indicates a seal band which is sealed by heat shrinkage at the fitting portion formed by overlapping the upper edge 5 of the bottom and the lower edge of the lid 2. FIG. 2 is a plan view of the container, and its outer shape, at least at its fitting portion, bulges out with a positive curvature in the radial direction from the inside of the container to the outside. This means that if there is a negative curvature part in this fitting part, radial pressure will not be applied to that part when the ring-shaped seal band heat-shrinks, so sealing will not be achieved. This is to prevent this. FIG. 3 is a side sectional view of the sealed container, with the items to be packaged omitted. 4 indicates a ridge provided at the bottom of the container.

Figure i4 shows a seal band made of the same material as the container.
Reference numeral 6 denotes a tongue piece that can be picked up with fingers when cutting the sealed band.

FIG. 5 is an enlarged cross-sectional view of the sealed container fitting.

Here, the sealing band 3 is shown tightly sealed to the fitting part.

Next, to explain the sealing process of the seal band, for example, place a fresh confectionery on the ridge at the bottom of the container bottom 1, cover it with M2, fit it to the bottom of the container, and then fit the seal band shown in Fig. 4 from the top of the lid. At the same time, pull it down so that the above-mentioned fitting part is covered with the band. Then increase the temperature to 12
Heat shrinkage occurs in the band by passing it through a hot air oven adjusted to 0 to 190°C for a predetermined period of time, and the band contracts to tighten the container along its fitting part, thereby increasing the pressure in the radial direction of the ring. Press the softened band to fill the space in the mating part.

In this example, the material thickness of the container is about 300 microns, and the thickness of the seal band is about 20 microns. As in this embodiment, even if the materials are the same, the difference in thickness brings about a difference in the heating time at which thermal contraction occurs, and it is possible to cause contraction only in the band.

In this example, a resin with high gas impermeability was used as the material for the container. One of the reasons for this is that the container itself does not require much cost, so even an extremely thin material can be made of a resin with high gas impermeability. This is because it needed to be high. However, the present invention is not limited to the material of the container body as long as it is gas-impermeable; for example, metals such as aluminum foil are of course applicable. Therefore, it is also within the scope of the present invention to apply the gas-impermeable and heat-shrinkable seal band of this embodiment to the fitting portion of the lid of a metal container to produce a gas-impermeable container. When a metal container is used, gas impermeability of the sealed portion is guaranteed, allowing long-term storage of anaerobic products.

Moreover, if the above-mentioned oxygen scavenger is added to the container before applying the seal according to the present invention, it is possible to create a packaging container that can be expected to have a shelf life close to that of a vacuum pack.

〔effect〕

Since the present invention is constructed as described above, it is suitable for blocking oxygen that causes fresh sweets to lose their freshness, taste, aroma, flavor, color, etc. Simply pulling the tongue piece will cause a break in the band,
As a result, the container is immediately unsealed, and since the band itself has no adhesive properties, it is extremely easy to remove the lid because there is no need to peel off the entire container as with conventional adhesive tapes.

In addition, to seal a container, you can simply place a previously prepared tongue-shaped seal band over the fitting part and heat it.
It is possible to seal without using an adhesive, and the sealing process is extremely simplified.

[Brief explanation of drawings]

Each drawing shows an embodiment of the invention. Figure 1 is an overall side view of the sealed container, and Figure 2 is a side view of the sealed container.
The top view of the figure, Figure 3 is! FIG. 2 is a sectional view taken along line A-A in FIG. Fig. 4 is an overhead view of the seal band, and Fig. 5 is an enlarged sectional view of the seal portion. In the figure 1...bottom, 2...lid, 3...seal band 6...tongue Patent applicant Taka B Package Co., Ltd. Figure 3
Figure 1F Figure 2

Claims (1)

[Claims] (1) A sealed container formed by fitting a bottom part and a lid vertically, the edge of the fitting part being a ring-shaped gas-impermeable and heat-shrinkable sealing band. A sealed container characterized by being coated and sealed. (2) The sealed container according to claim (1), wherein the container is made of the same material as the seal band, and the material thickness of the band is smaller than the material thickness of the container. (3) The sealed container according to claim (1), wherein the fitting portion of the container has a positive curvature outward from the inside of the container. (4) The sealed container according to claim (1), wherein a tearing tongue piece of the band is provided on a side edge of the seal band. (5) Fit a lid to the bottom part containing the packaged item, hang a ring-shaped gas-impermeable and heat-shrinkable sealing band so as to cover the fitting part of the bottom part and the lid, and then the sealing band. A method for sealing a sealed container, comprising the step of heating and shrinking the fitting portion to seal the fitting portion. (6) The sealing method according to claim (5), wherein the seal container is made of the same material as the seal band, and the material thickness of the band is smaller than the material thickness of the container. (7) The sealing method according to claim (6), wherein the seal container is made of metal.