JPH04135465U - plastic containers - Google Patents

Abstract

(57) [Summary] [Structure] A flange 15 is formed by extending the flange 15 with a gap 14 in the side surface 12A of the container body 12, and the side surface 12A of the container body 12 includes at least the lower part 15A of the flange 15. P around
A shrink film 16 made of VC or the like is wrapped. In this container 11, the length from the opening 13 of the flange 15 to the flange lower end 15B is 1/4 to 2/2 of the height of the container body 12.
It is appropriate to set it to 3. [Effect] A plastic container can be obtained that has heat insulation properties, is suitable for forming deep-drawn containers with a large expansion magnification, and is inexpensive in terms of cost.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is suitable for plastic containers that can be held in the hand while containing high-temperature food, for example. Concerning vessels.

0002

[Background technology]

For example, with the spread of microwave ovens, plastics that can be heated together with the food inside are becoming popular. The food container was developed, and after heating the entire container in the microwave, the container was heated. Eating the food inside. Such plastic containers have both heat resistance and heat resistance against high-temperature heating in microwave ovens. Insulation is required when holding containers containing hot food after heating. .

0003 Conventionally, for example, according to Japanese Patent Publication No. 40-7385, a deep-bottomed container with double side walls has been developed. A vacuum forming method has been proposed. The container obtained by this vacuum forming method is The flange (outer side wall) of the container has a length that reaches the bottom surface of the container body. The air layer formed between the tank and the container body provides insulation.

0004

[Problem that the idea aims to solve]

In the case of the container according to the above-mentioned Japanese Patent Publication No. 40-7385, the flange reaches the bottom surface of the container body. Because it is so long, it is necessary to use a deep drawing capacity with a development magnification (container surface area/container opening area) of 3 or more. The problem is that the vessels are difficult to mold. In addition, in order to form the flange by vacuum forming, Therefore, the diameter of the bottom is larger than the diameter of the opening, making it easier to handle. There are also design drawbacks such as inferior performance and poor appearance.

[0005] Note that instead of forming the flange for heat insulation, the container body is made of Styrofoam. A container that has insulation properties by molding it with foamed plastic such as resin. Although it has been put into practical use, it is expensive. Therefore, the present invention aims to create a deep-drawn container that has heat insulation properties and a large expansion magnification. Our aim is to provide plastic containers that are suitable for both shape and cost. do.

[0006]

[Means to solve the problem]

The plastic container according to the present invention has a flap with a gap along the side of the container body. the container body extending and forming a flange, including at least a lower portion of the flange; It is characterized by a plastic film wrapped around the side surface of the device. The material of the container body is arbitrary, and commonly used materials can be used. Ru. For example, PP (polypropylene), PET (polyethylene terephthalate) , PE (polyethylene), PS (polystyrene), and the like. The material of the plastic film is also optional, but shrink film is It is preferable to use lume from the viewpoint of adhesion. For example, PVC (polyvinyl chloride), P A shrink film made of P or the like can be mentioned.

[0007] For this container, the length of the flange from the container opening to the bottom end of the flange is, for example, For example, it is appropriate to set the height to 1/4 to 2/3 of the height of the container body, and larger than 2/3. It becomes difficult to form deep-drawn containers with a development magnification of 3 or more, and if it is smaller than 1/4, It becomes difficult to hold it in your hand. Note that the lid may be provided if necessary, and this material may be one that is commonly used. is available. For example, single-layer fibers such as PET, nylon, PP, PE, Al, etc. and laminates of these monolayer films.

[0008]

[Effect]

In the plastic container according to the present invention, the flap is the part that is touched when holding the container. Since a gap is formed between the lunge and the container body, the air layer in this gap provides insulation. As a result, a container with good thermal insulation properties is obtained. This structure provides insulation, so the container body is made of foamed plastic, etc. There is no need to use expensive insulation materials to provide insulation, and the container body and flange are Relatively inexpensive materials can be used for both containers, making it possible to reduce container costs.

[0009] Also, shrink around the sides of the container body, including at least the bottom of the flange. Because the film is wrapped around the container, the gap between the flange and the container body is hidden. The appearance is also favorable. Furthermore, the length of the flange from the container opening to the bottom end of the flange is equal to the height of the container body. By setting the size to 1/4 to 2/3, it has good handling when held in the hand. becomes.

0010

[Example] Example 1 As shown in FIG. 1, a plastic container 11 according to this example includes a cylindrical container body 12, and an opening 13 of the plastic container 12 that is bent outward from a side surface 12A. A flange 15 is formed with a slight gap 14 along the container body 12, and a plastic film 16 is wrapped around the side surface 12A of the container body 12, including the lower part 15A of the flange 15. There is. This container body 12 is molded with a development magnification of 3 times. In this container 11, the length from the opening 13 of the flange 15 to the flange lower end 15B is approximately 2/5 of the height of the container body 12. The container body 12 and the flange 15 are made of the same PP sheet with a thickness of 1.6 mm.

[0011] The plastic film 16 is made of PVC shrink film and has a thickness of It is 50μm. Using this plastic container 11, a heat insulation test was conducted in the following manner. . In other words, if you put sauce at 100°C in container 11 and hold container 11 in your hand, how many hours will it last? I tested it to see if I could hold it. This was done by 10 subjects each, and the average The time was calculated. This is called grip time. However, measurements can be made for up to 120 seconds, and It was possible to grip it for several seconds beyond this point. In the case of the container 11 according to this example, the grip time was 120 seconds.

Examples 2 to 4 The plastic container 11 according to each example has the same structure as Example 1, but only the material or expansion magnification was changed as follows. The same heat insulation test as in Example 1 was also conducted on the plastic containers 11 according to each Example. That is, in the case of Example 2, the container body 12 and the plastic film 16 are the same as in Example 1, but only the expansion magnification is set to 4. For this container 11, the grip time was 120 seconds.

[0013] In the case of Example 3, the expansion magnification is the same as in Example 1, but the container body 12 is made of talc. Consists of added PP sheet, and plastic film 16 is PP shrink Consists of film. For this container 11, the grip time was 120 seconds. In the case of Example 4, the material is the same as Example 3, but only the expansion magnification is 4. It is. For this container 11, the grip time was 120 seconds.

[0014] According to the plastic containers 11 according to Examples 1 to 4 above, when holding the container 11, the hand Because a gap 14 is formed between the flange 15 and the container body 12, which are the touching parts. , the air layer in this gap 14 becomes a heat insulating layer, and as shown in the grip time of the heat insulation test, , it can be seen that it has good heat insulation properties. Therefore, the container body 12 itself is insulated using an expensive insulating material such as foamed plastic. It is no longer necessary to provide properties, and both the container body 12 and the flange 15 are relatively inexpensive. By using suitable materials, the container cost can be reduced.

[0015] Also, the periphery of the side surface 12A of the container body 12, including the lower part 15A of the flange 15, is shrunk. Because the film 16 is wrapped around the container, the gap between the flange 15 and the container body 12 is hidden and the outside It becomes invisible from the outside and has a favorable appearance. The length from the container opening 13 of the flange 15 to the flange lower end 15B is the height of the container body 12. By setting the size to approximately 2/5, the handleability when held by hand is improved. Furthermore, as in Examples 2 and 4, the container 11 is deep-drawn with a four-fold expansion magnification. It can also be molded without any problem.

Comparative Example 1 As shown in FIG. 2, a plastic container 1 according to this comparative example consists of a container body 2 in the shape of an inverted truncated cone. This container body 2 is made of a PP sheet (thickness 1.6 mm), and the unfolding magnification is 3 times. The same heat insulation test as in Example 1 was also conducted on the plastic container 1 according to this comparative example. As a result, the grip time was 5 seconds.

Comparative Example 2 As shown in FIG. 2, a plastic container 1 according to this comparative example includes a container body 2 having an inverted truncated cone shape, and a side surface 12A of this container body 2 that is laminated around the side surface 12A. The film 3 is composed of The container body 2 is made of a PP sheet (thickness: 1.6 mm), and the film 3 is made of a PVC shrink film (thickness: 50 μm). In the case of this container 1, the grip time was 5 seconds.

Comparative Examples 3 to 5 The plastic containers 1 of each comparative example had the same structure as that of comparative example 2, but only the material was changed as follows. A heat insulation test was also conducted on the container 1 of each comparative example. That is, in the case of Comparative Example 3, the container body 2 was made of a PP sheet (thickness: 1.0 mm) to which talc was added, and the film 3 was made of a PP shrink film (thickness: 20 μm). In the case of this container 1, the grip time was 5 seconds.

[0019] In the case of Comparative Example 4, the container body 2 was made of a PP sheet (thickness 1.6 mm), and the front Film 3 is made of foamable PP shrink film (thickness 260 μm). It is. For this container 1, the grip time was 15 seconds. In the case of Comparative Example 5, the container body 2 was made of a PP sheet (thickness 1.6 mm), and the front Film 3 is made of foamable PS shrink film (thickness: 300 μm) It is. For this container 1, the grip time was 45 seconds.

[0020] According to Comparative Example 1 above, since the container 1 is made of the container body 2 made of PP sheet, As shown by the rip time, it can be seen that the insulation properties are poor. Furthermore, according to Comparative Examples 2 and 3, the film 3 is laminated on the container body 2. However, since Film 3 does not have insulation properties, there is still no improvement in grip time. I can't. Furthermore, according to Comparative Examples 4 and 5, a film 3 having heat insulating properties was placed on the container body 1. Since it is laminated, the grip time is improved compared to Comparative Examples 2 and 3. It can be seen that the heat insulation properties are inferior to those of the examples.

[0021]

[Effect of the idea]

According to the present invention, a deep-drawn container with heat insulation properties and a large expansion magnification can be formed. It is possible to obtain a plastic container that is suitable for use in other industries and is also inexpensive in terms of cost.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a plastic container according to an embodiment of the present invention.

FIG. 2 is a sectional view of a plastic container according to a comparative example.

[Explanation of symbols]

11 Plastic containers 12 Container body 12A Side part of container body 13 Container opening 14 Gap 15 Flange 15A Bottom of flange 15B Lower end of flange 16 plastic film

Claims (3)

[Scope of utility model registration request] 1. A flange is formed extending along the side surface of the container body with a gap therebetween, and a plastic film is wrapped around the side surface of the container body including at least the lower part of the flange. A plastic container featuring: 2. The plastic container according to claim 1, wherein the length of the flange from the container opening to the lower end of the flange is 1/4 to 2/3 of the height of the container body. 3. The plastic container according to claim 1, wherein the plastic film is a shrink film.