JP2928437B2 - Heat-resistant containers for food - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-resistant container for food.
In particular, the present invention relates to a heat-resistant food container that is particularly suitable for use in the manufacture of confectionery and the like manufactured by placing dough in a container main body, such as a muffin, and baking at high temperature in an oven or the like.

[0002]

2. Description of the Related Art Heretofore, as this kind of heat-resistant container for food, a paper sheet cut into a circular shape and formed into a bottomed container shape having an opening at the top has been used. However, this type of paper container requires a process of forming corrugated folds on a peripheral wall portion and forming a folded portion at an upper opening portion in order to enhance shape retention, which is costly. In addition, in order to obtain a well-formed product, in order to prevent deformation of the container body due to baking of the dough in the oven, a flange member for keeping the upper edge of the opening may be separately prepared. Needed.

[0003]

As described above, a container using a paper sheet has a complicated structure and requires a separate flange member, so that the production cost can be kept low. There is a need for a heat-resistant container for food that can be formed and has the necessary shape retention even during firing at a high temperature. As one means to solve it,
Polyethylene terephthalate resin has heat resistance, shape retention,
Focusing on its excellent impact resistance, deep drawing formability, etc., as a container used for putting dough in a container body and baking it at a high temperature in an oven as in the case of making muffins, FIG.
As shown in (a), a foamed or non-foamed crystalline polyethylene terephthalate sheet is processed by a molding machine to produce a molded sheet 1 having a large number of bottomed container bodies, and then trimmed. A container body 2 as shown in FIG. 3 (b) has been used. Note that FIG.
In (b), 3 is a trimming loss part.

[0004] This container uses a foamed or non-foamed crystalline polyethylene terephthalate resin as a material, so that even if it is heated to about 150 ° C to 250 ° C in an oven to bake muffins or the like, it can be heated to a high temperature during heating. In particular, when foamed crystalline polyethylene terephthalate resin is used as a raw material, it has excellent heat insulating properties, and thus has an advantage that it can be taken out with bare hands immediately after firing.

[0005] However, the present inventors have repeated baking tests using the individual container bodies 2 manufactured as described above, so that baking and cooking in a high temperature state in an oven for about 30 minutes are performed. When performed, the expansion ratio of the foamed or non-foamed crystalline polyethylene terephthalate resin,
It was perceived that the container body might be slightly distorted or deformed depending on conditions such as crystallinity and thickness. The present inventors have tried to prevent the occurrence of such a distortion by changing the conditions of the foamed or non-foamed crystalline polyethylene terephthalate sheet, that is, by changing the physical property values, but always obtain satisfactory results in terms of cost. I couldn't do that.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a heat-resistant food container excellent in shape retention that can be molded at low cost while making use of the advantages of foamed or non-foamed crystalline polyethylene terephthalate resin. .

[0007]

Means for Solving the Problems The present inventors have further conducted experiments and researches to produce a heat-resistant container for food using a foamed or non-foamed crystalline polyethylene terephthalate sheet, and thus, to manufacture a heat-resistant container for a container. By integrally forming the flange portion in the opening, regardless of the physical property value of the foamed or non-foamed crystalline polyethylene terephthalate sheet, the occurrence of distortion or deformation at the time of high-temperature cooking can be prevented to the extent that it can withstand practical use. Perceived that it is possible. In addition, in the case where a plurality of container body portions are formed in a continuous state via the flange portion, it has been perceived that distortion and deformation of the container body portion are particularly small. Furthermore, even if no distortion or deformation occurs in the container main body part, it is also perceived that some distortion or deformation may occur in the flange part, and when the product is put on the market as a product, the distortion or deformation may occur. I perceived that the deformed flange portion should be removed.

The present invention is based on the above perception,
A container having a plurality of bottomed container bodies having an upper opening and a flange interconnecting the respective openings of the bottomed container, wherein the container body and the flange have a crystallinity of 20%. The above-mentioned foamed crystalline polyethylene terephthalate sheet is integrally formed, and a perforated cut portion is formed on the flange portion so that each container body can be individually separated as necessary, or Disclosed is a heat-resistant food container, wherein a perforated cut portion is formed near the boundary between each container body and the flange portion along the shape of the upper opening of each container body.

Further, the present invention is a container having a plurality of bottomed container bodies having an upper opening and a flange for interconnecting the respective openings of the bottomed container. The flange is integrally formed with a foamed or non-foamed crystalline polyethylene terephthalate sheet having a crystallinity of 20% or more, and the flange is perforated so that each container body can be individually separated as necessary. Cut portion is formed, and further, a perforated cut portion is further formed along the shape of the upper opening of each container body near the boundary between each container body and the flange. Disclosed is a heat-resistant food container that can be easily separated between the container body and the flange as required.

[0010] The foamed or non-foamed crystalline polyethylene terephthalate sheet used may be a single-layer sheet,
At least one surface may be a sheet laminated with a crystalline polyethylene terephthalate sheet. When a foamed crystalline polyethylene terephthalate sheet is used, a foaming density of about 0.1 to 0.8 can be used effectively, and the thickness of the sheet is preferably 0.5 to 3 in terms of heat insulation and strength. It is preferably about 0.0 mm. When a non-expanded crystalline polyethylene terephthalate sheet is used, the thickness is preferably about 0.2 to 0.6 mm.

The heat-resistant food container according to the present invention may be a single container, or may be a form in which a plurality of container bodies are integrally connected by a flange. In any case, the container body and the flange are integrally formed. At that time, after integral molding using a commonly used molding machine,
The molded product may be removed from the mold and a perforated cut may be formed as a post-process, or the mold may be formed so that the perforated cut is formed at the same time as molding. May be. Further, a cutting blade that moves up and down, for example, may be attached to the molding machine so that a cut can be formed by using a molding machine so that a perforated cut can be formed in the molded product without opening the mold.

The number and dimensions of the perforated cuts are arbitrary, but if the total area of the connection between the cuts is too large, the container body and the flange will be separated when necessary. If it is too small, it will not be possible to effectively prevent distortion generated in the container body during high-temperature cooking. According to an experiment, it was found that at least the dimension between the cuts of the perforated cuts is preferably about 0.1 to 1.3 mm.

[0013]

[0014]

The heat-resistant container for food according to the present invention is filled with a material that needs to be baked and cooked at a high temperature, for example, a muffin dough, and then left in a high-temperature environment such as an oven for a required time. Is done. Polyethylene terephthalate resin, which is a material, is excellent in heat resistance, shape retention, deep drawability, etc., so that deformation (strain) due to heating during cooking rarely occurs in the container body. Depending on the molding environment and conditions at the time of molding the container, there is a possibility that distortion or the like may occur due to, for example, relaxation of residual stress. However, in the heat-resistant food container according to the present invention, since the flange portion extending therefrom is integrally formed with the upper opening, it is possible to effectively prevent the distortion of the container main body due to heat. . This makes it possible to obtain an aesthetically pleasing product with high commercial value.

A perforated cut is formed near the boundary between the container body and the flange along the shape of the upper opening of the container body. And can be easily separated. Therefore, when a product is put on the market or in a store after baking, it is possible to easily remove the flange portion which may impair the aesthetic appearance as necessary. This is particularly effective when the flange is deformed by heat. Even when the fitting lid is fitted to the container main body, it can be performed without any inconvenience.

Further, in the case where a plurality of container body portions are integrally connected by a flange portion, a large number of products can be processed simultaneously and easily without causing deformation of the container body portion. Since the perforated cut portion is formed in the flange portion, each container main portion can be individually separated as necessary, and further, the sewing machine is provided near the boundary between the container main portion and the flange portion. When the eye-shaped cut portion is formed, the flange portion can be removed, and a large number of products having high commercial value can be obtained at the same time.

When a material having at least one surface laminated with a crystalline polyethylene terephthalate sheet is used, a necessary design can be easily applied, and the commercial value can be further enhanced.

[0018]

The present invention will be described below with reference to examples. Embodiment 1 FIG. 1 shows a heat-resistant food container according to the present invention. FIG. 1a is a front view thereof, and FIG. 1b is a sectional view taken along line AA of FIG. 1a. As material, thickness 1mm, weighing 3
Using a foamed crystalline polyethylene terephthalate sheet having a crystallinity of about 100 g / m ² and a crystallinity of about 10%, a height H = 50 mm,
The container body 20 having a diameter D of 90 mm and the flange 30 were integrally molded to obtain a molded article of foamed crystalline polyethylene terephthalate having a crystallinity of 20 to 25%. The thickness of the flange after molding was 2 mm. Further, at the time of molding, a perforated cut portion 40 was formed near the boundary between the container body 20 and the flange 30 along the shape of the upper opening of the container body. As schematically shown in an enlarged view in FIG. 1C, the number of the connecting portions 41 between the cuts in the perforated cuts 40 is 12, and the size thereof is 0.5 mm.

Using this container, the container body was filled with 90 g of muffin dough, placed in an oven, and heated at about 220 ° C. for 30 minutes and fired. After cooking, the container was taken out of the oven with bare hands. Although some deformation of the flange portion 30 due to heat was observed, the outer shape of the container body portion was not deformed and retained the original shape. With the container body 20 held down by hand, one piece of the flange 30 was lifted. The container body and the flange were easily separated from each other, and the container body kept its original shape even after the separation.

[Embodiment 2] As shown in FIG.
6 similar container body portions 20 using the same resin sheet
And the flange portion 30 (only three are shown in FIG. 2). However, the container body 20 and the flange 30
A perforated cut portion 50 was formed in the middle of the container body and the container at the boundary between and the perforated cut portion 50 extending in the entire width direction. The number and dimensions of the perforations in the perforated cuts 50 were the same as in Example 1.

Using this container, a muffin was cooked in the same manner as in Example 1. After cooking, the container was taken out of the oven with bare hands. The outer shape of the flange portion 30 and all the container body portions 20 was not deformed, and the original shape was maintained. The individual container main bodies 20 could be easily separated along the cut 50, and the flange and the container main body did not deform even after the separation.

Example 3 The same cooking was performed using the same sheet as in Example 1. However, the number and the size of the cuts 40 of the perforated cuts 40 along the shape of the upper opening of the container main body formed near the boundary between the container main body 20 and the flange 30 and the connecting portions 41 of the cuts are variously changed. An experiment was conducted by preparing a number of modified ones. Table 1 shows the results.

From the table, it can be seen that the ease of deformation and the ease of separation are contrary conditions, but the number of breaks 41 is generally about 3 to 20 and the size is about 0.2.
It turns out that about 1 to 1.3 is effective.

[0024]

[Table 1]

[Comparative Example 1] After the container body and the flange were integrally formed using the same sheet as in Example 1, the flange was removed by trimming, and the container had a height H = 50 mm and a diameter D = 90 mm. Only a plurality of body parts were prepared. The same cooking as in Example 1 was performed using the container. After cooking, the container was taken out of the oven with bare hands. Most of the containers were deformed due to heat during cooking, such as the opening of the container becoming oval. It was returned to a circular shape by hand, but it was deformed again upon standing.

Example 4 A heat-resistant food container similar to that shown in FIG. 1 was prepared. However, as a material, thickness 350μ
m, a non-foamed crystalline polyethylene terephthalate sheet having a crystallinity of about 10%, a height H = 50 mm, and a diameter D =
The 90 mm container body 20 and the flange 30 were integrally molded to obtain a molded article of non-expanded crystalline polyethylene terephthalate having a crystallinity of 20 to 25%. The thickness of the flange after molding was 2 mm. Further, as in the case of Example 1, a perforated cut portion 40 was formed near the boundary between the container body 20 and the flange 30 at the time of molding along the shape of the upper opening of the container body. In the perforated cut portion 40, the number of the connecting portions 41 between the cuts was also 12 and the size was 0.5 mm.

Using this container, 90 g of muffin dough was filled in the container main body, and then placed in an oven and heated at about 220 ° C. for 30 minutes and fired. After cooking, the container was taken out of the oven with bare hands. Although some deformation of the flange portion 30 due to heat was observed, the outer shape of the container body portion was not deformed and retained the original shape. With the container body 20 held down by hand, one piece of the flange 30 was lifted. Although the container main body and the flange could be separated, the sheet itself was stronger than foamed polyethylene terephthalate. However, after the separation, the container body kept its original shape.

COMPARATIVE EXAMPLE 2 A container having a height H = 50 mm and a diameter D = 90 mm was obtained by integrally molding a container body and a flange using the same sheet as in Example 4, and then removing the flange by trimming. Only a plurality of body parts were prepared. The same cooking as in Example 4 was performed using the container. After cooking, the container was taken out of the oven with bare hands. Most of the containers were deformed due to heat during cooking, such as the opening of the container becoming oval. It was returned to a circular shape by hand, but it was deformed again upon standing.

[0029]

According to the present invention, even when cooking such as baking at a high temperature for a long time as in an oven, a heat-resistant food container which does not deform due to heat can be obtained.

[Brief description of the drawings]

FIG. 1 is a view showing a heat-resistant food container according to an embodiment of the present invention.

FIG. 2 is a view showing a food heat-resistant container according to another embodiment of the present invention.

FIG. 3 is a view showing a process of manufacturing a food heat-resistant container according to a conventional example.

[Explanation of symbols]

10 foamed or non-foamed crystalline polyethylene terephthalate sheet, 20 container body part, 30 flange part, 40
… Perforated cuts.

Continuation of the front page (56) References JP-A-3-269054 (JP, A) JP-A-57-137174 (JP, U) JP-A-61-169080 (JP, U) JP-A-57-5711 (JP, U) , U) Shokai 57-49486 (JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) B65D 1/26 B65D 1/30 B65D 21/024 B65D 81/34

Claims (4)

(57) [Claims] 1. A plurality of bottomed container bodies having an upper opening.
And a flange connecting the respective openings of the bottomed container to each other.
A container body,
The di-part is foamed crystalline polyethylene with a crystallinity of 20% or more.
It is integrally molded from a terephthalate sheet.
In addition, each container body part is individually
Perforated cuts are formed so that they can be separated
Or near the boundary between each container body and the flange
Perforated along the shape of the upper opening of each container body
For food, characterized by the formation of cuts
Thermal container. 2. A plurality of bottomed container bodies having an upper opening.
And a flange connecting the respective openings of the bottomed container to each other.
A container body,
The di-part is a foamed or non-foamed crystalline foam having a crystallinity of 20% or more.
Integrally molded with ethylene terephthalate sheet
And the main body of each container is mounted on the flange as necessary.
Perforated cuts are formed so that they can be separated
And each of the container body and the flange
Near the boundary, follow the shape of the upper opening of each container body.
A perforated cut is further formed,
Can be easily separated between the container body and the flange.
Food heat-resistant containers. 3. The heat-resistant container for food according to claim 1, wherein at least one surface is laminated with a crystalline polyethylene terephthalate sheet. 4. The heat-resistant container for food according to claim 1, wherein a dimension between the cuts of the perforated cuts is about 0.1 to 1.3 mm.