JPH078408Y2 - Food and drink containers - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention can be suitably used mainly as a substitute for containers for various instant beverages such as canned coffee, cocoa, black tea, and oolong tea, especially metal cans and glass bottles. The present invention relates to a synthetic resin food and drink container having excellent storage stability.

[Problems to be Solved by Conventional Technology] Conventionally, as a container for instant beverage such as canned coffee, a metal can such as an aluminum can or a glass bottle is often used, but when drinking hot coffee or tea. It is heated by being dipped in hot water or stored in a heater using steam. As a result, the temperature did not rise sufficiently, or the heating took a very long time.

Further, a metal can such as an aluminum can or a glass bottle has a very good heat conductivity, and therefore, there is a drawback that it becomes too hot to handle with bare hands after heating.

A microwave oven may be used to facilitate the heating of the beverage, but the metal can cannot be heated by the microwave oven. However, it is not preferable to transfer the stored beverage to another container and heat it in a microwave oven because the handling becomes complicated.

In order to solve the above problems, it is considered to use a container made of foamed plastic, but polysulene resin, polyethylene resin, polypropylene resin, polyvinyl chloride resin which is frequently used for packaging containers has gas barrier property and It has the disadvantages of poor aroma retention and a short shelf life of beverages. In addition, although the resin foam has heat insulating properties, it is poor in heat resistance due to its material and has a problem in shape retention during heating by a microwave oven.

The present invention has been variously studied in view of the above, and pays attention to the fact that a polyester resin is excellent in heat resistance, shape retention strength, cushioning property, deep drawing moldability, and particularly in aroma retention property. By using this polyester-based resin, it has sufficient heat resistance during heating of a microwave oven, has heat insulation properties that can be held with bare hands immediately after heating, and also has gas barrier properties and aroma retention properties. It is intended to provide a beverage product container which is excellent and can be suitably used as a container for beverages such as coffee instead of a metal can or a glass bottle.

[Means for Solving the Problems] A beverage container according to the present invention for solving the above problems comprises a container body and a lid that closes an upper opening of the container body.
Density 0.9g / c with thermoplastic polyester resin as the main component
It is characterized in that it is formed by deep drawing from a laminated foamed sheet of a foamed sheet of c or less and a non-foamed polyester resin film layer to a drawing ratio of 0.5 or more.

Here, the aperture ratio a is the opening diameter d and height h of the container body.
Ratio (a = h / d). When the drawing ratio a is less than the above, it is unsuitable as a substitute for a metal can or the like used for a conventional container for beverage such as canned coffee or tea.

The reason why the density of the foamed sheet is 0.9 g / cc or less is that the expected heat insulating property cannot be obtained if the density is more than this. However, if the density is too low, the shape-retaining property or the fragrance-retaining property is inferior depending on the thickness, so it is not preferable to reduce the density too much.

[Operation] In the beverage product container of the present invention having the above-described configuration, the container body is
Density 0.9g / c with thermoplastic polyester resin as the main component
Since it is composed of a laminated foamed sheet of a foamed sheet of c or less and a non-foamed polyester resin film layer and has a drawing ratio of 0.5 or more, it has a container shape with a relatively deep appearance, Moreover, the gas barrier property and the aroma retaining property are very excellent, and the beverage or the like can be prevented for a long period of time without fear of deterioration.

In addition, polyester resin is superior in heat resistance to polystyrene resin and polypropylene resin in terms of material,
As it is a laminated foam sheet consisting of a foam sheet and a film layer, it has sufficient heat resistance when heated by a microwave oven, and as a result, it itself does not heat up even after heating. It can be handled by holding the container and the shape retention is also good.

[Embodiment] Next, an embodiment of the present invention will be described with reference to the drawings.

(1) is a container body of a food and drink container according to the present invention. The container body (1) has a height of a laminated foam sheet composed mainly of a thermoplastic polyester resin and having a density of 0.9 g / cc or less, and a non-foamed polyester resin film layer laminated on the inner surface side of the container. Where h is h and the opening diameter is d, the drawing ratio a (h / d) is deep drawn to 0.5 or more.
The container body (1) contains contents such as beverages (not shown).
After the filling, the sheet-like lid (3) is attached to the opening edge portion (2) by a heat fusion means or the like.

As the lid (3), a foamed sheet made of the same material as the container body (1) is used, a non-foamed sheet made of the same material or another thermoplastic resin, a composite sheet of these, or another resin film having excellent gas barrier properties. A composite sheet containing can also be used. Further, the lid can be attached to the container body by a fitting means or the like.

The thermoplastic polyester-based resin used for the container body (1) is a high-molecular chain polyester obtained by reacting an aromatic dicarboxylic acid with a dihydric alcohol,
Among them, those containing polyester terephthalate or polybutylene terephthalate as a main component are preferably used in terms of heat resistance and economy.

The above polyester resin is a crystalline resin and has no heat resistance unless its crystallinity is high. For example, when food is heated in a microwave oven, it can reach a local temperature of 150 ° or more. The crystallinity that can withstand this temperature is 20% or more,
Therefore, the crystallinity is preferably 20% or more.

Therefore, the polyester resin foam sheet,
It can be obtained by extruding the resin into a sheet and foam-molding it, while suppressing crystallization when forming the foamed sheet,
The above-mentioned deep drawing can be easily performed, and crystallization is promoted during this drawing to increase the crystallinity to 20% or more.

The thickness of the foam sheet used for the container body (1) varies depending on the expansion ratio and the like, but a thickness of usually 0.5 to 7.0 mm, preferably 1.0 to 5.0 mm is suitable from the viewpoint of heat insulation and the like.

Thus, the laminated foamed sheet of the thermoplastic polyester-based resin foamed sheet and the non-foamed resin layer is excellent in heat insulation and also excellent in heat resistance as compared with expanded polystyrene or expanded polypropylene in terms of material. Not only that, it is also excellent in gas barrier properties and aroma retention.

That is, for example, the aroma permeability of each resin film such as polyethylene terephthalate (PET), high-density polyethylene (HDPE), polypropylene (PP), polyvinyl chloride (PVC), nylon, which is one type of polyester resin, According to the data shown in the 1963 edition of the Journal of the Japan Food Industry Society, the following is shown in Table 1.

Therefore, the container of the present invention in which the container body (1) is formed from the laminated foamed sheet of the polyester resin foamed sheet and the non-foamed resin layer has good gas barrier properties and aroma retention properties and is a content. There is no fear that the scent of coffee, tea or other food or drink will be deteriorated or deteriorated, and the food or drink can be well preserved for a long period of time.

When heating the food and drink inside, it is sufficient to heat it in a microwave oven as it is, and since the container body (1) itself has excellent heat resistance as described above, it is sufficient to heat it in this microwave oven. Endures and does not deform.
In addition, since it is a foam and has excellent heat insulating properties, it can be taken out with bare hands immediately after heating, and handling after heating is easy.

Thus, although not shown, a non-foamed resin layer of polyester resin such as polyethylene terephthalate or polybutylene terephthalate is laminated inside the foamed sheet of polyester resin that constitutes the container body (1). Thereby, the gas barrier property and the aroma retaining property are further improved, and the low temperature brittleness is also improved.

[Advantage of Invention] As described above, according to the present invention, since the container body is made of the foamed sheet of polyester resin, it has excellent heat resistance,
It can be heated by a microwave oven without any problem, is sufficiently resistant to the heating, and is made of a foamed sheet, and can be held and handled with bare hands immediately after heating. Moreover, in addition to the gas barrier property, it is particularly excellent in aroma retaining property, the stored foods and drinks are excellent in preservability, and there is no fear that the aroma is deteriorated or deteriorated over a long period of time.

Therefore, it can be suitably used as a container for instant drinks and other foods and drinks, which replaces the conventional metal cans and glass bottles, in particular, the foods and drinks having the contents can be heated by a microwave oven together with the container.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of the entire container showing an embodiment of the present invention. (A) ... the food and drink container of the present invention, (1) ... the container body,
(2) ... Open end, (3) ... lid.

Claims (1)

[Scope of utility model registration request] 1. A container comprising a container body and a lid which closes an upper opening of the container body, wherein the container body is composed of a thermoplastic polyester resin as a main component and has a density of 0.9 g / cc or less and a non-foamed sheet. A food and drink container formed by deep-drawing a laminated foam sheet with a polyester resin film layer to a drawing ratio of 0.5 or more.