KR20210125681A - Disposable Food Container Prepared with Polypropylene Foamed Sheet and Process of Preparing the Same - Google Patents

Abstract

The present invention discloses a disposable food container, made of a sheet which is laminated with a polypropylene (PP) foam sheet and a printed paper on which necessary information including a product design is printed. A thickness of the sheet, laminated with the PP foam sheet and the printed paper, is desirable to be 0.7 to 1.5 mm, a weight ratio of the printed paper to the PP foam sheet is desirable to be 1 : 1.5 to 1 : 2.5, and a foaming magnitude of the sheet, laminated with the PP foam sheet and the printed paper, is desirable to be 20 to 50 times. During a process to manufacture the PP foam sheet having a foaming magnitude of 20 to 50 times, the sheet, laminated with the PP foam sheet and the printed paper, is laminated with the PP foam sheet and the printed paper by foaming heat of polypropylene by inserting the printed paper before solidification (coagulation) of the foam sheet. The disposable food container satisfies a shape, waterproof property, heat-resisting property, and heat insulation property to be used in a microwave oven.

Description

Disposable Food Container Prepared with Polypropylene Foamed Sheet and Process of Preparing the Same

The present invention relates to a disposable container for packaging various kinds of noodles, such as ramen or udon, and various instant foods, such as soup or soup. More specifically, the present invention relates to a disposable container that is heated by using hot water or a microwave oven in a container in which semi-cooked food is packaged.

Disposable containers for packaging convenience foods are one of the most common product packaging containers today. In particular, instant foods such as noodles and soup, such as cup noodles or cup udon noodles, are cooked by using hot water or heating them in a microwave oven.

Disposable food packaging containers are usually made of paper, plastic film, plastic sheet, or the like. These containers must not only maintain their formability, but also have waterproof, heat-resistant and heat-insulating properties, can be used in a microwave oven, and have excellent surface printability to enhance product value.

The representative product most often used as a disposable heat-resistant container is the cup noodle container, which was previously manufactured using polystyrene foam sheet. This foam sheet had excellent thermal insulation properties, and there was no major problem in use. However, there was a problem that harmful substances were detected when using high-temperature water or using a microwave oven, the product value was lowered due to poor printability, and the microwave oven could not be used because of poor heat resistance.

Containers using polypropylene have been developed instead of polystyrene, which has poor heat resistance and is harmful to the human body. In Utility Model Registration Publication Nos. 2000-0007691 and 2000-0010571, instant food in which a plurality of ribs protruding from the surface of the container body are formed so that the human body does not directly contact the container body formed by injection molding of polypropylene Initiate courage.

Patent Application Publication No. 2020-0002328 discloses a foamed sheet in which a polyester resin is foamed with inorganic particles and a food container made of the sheet.

Patent Application Laid-Open No. 2002-0042464 discloses a polypropylene resin foam container for microwave cooking that is not deformed during cooking in a microwave and has excellent heat resistance, wherein the container includes a polypropylene resin and and a non-foaming layer containing talc. This container is characterized by including a non-foaming layer containing polypropylene resin and talc on at least one surface of the polypropylene resin foam layer in order to solve the problem that the heated container is easily deformed when a microwave oven is used.

Polyethylene foam resin is not suitable as a food container because of its weak strength. This is because food containers must maintain sufficient strength to maintain their formability as food containers. In addition, one of the reasons that these were not put to practical use was the difficulty of attaching a separate label because surface printing was impossible.

A container developed to meet all the requirements that must be used in a microwave oven, including the characteristics of disposable food containers such as formability, waterproofness, heat resistance, and heat insulation properties am. Because it uses thick paper, it can maintain its shape, and has waterproofness because the inner surface is coated (laminated) with an unfoamed polyethylene film, and it can be used in a microwave oven. However, it is not easy to handle because it is hot when it comes into contact with the skin (hands) when hot water is used or heated in a microwave due to lack of insulation. In order to supplement thermal insulation, a thick paper cover or a paper cover with irregularities is provided on the outside of the container again in the form of wrapping, and necessary information including a product design is printed on the cover. This also involves problems such as an increase in the amount of paper used because thick paper is used, and difficult printing and an increase in printing cost because the cover paper is also thick.

The present inventor satisfies all the requirements that must be used in a microwave oven, including the characteristics of disposable food containers such as formability, waterproofness, heat resistance, and heat insulation, while remarkably reducing the amount of paper used to save resources, improve print quality, It is possible to reduce printing cost and manufacturing cost, and to develop a new disposable food container of the present invention that can increase product value.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a disposable food container that satisfies all the requirements to be usable in a microwave oven, including morphology, waterproofness, heat resistance, and heat insulation, which are characteristics of a disposable food container.

Another object of the present invention is to provide a disposable food container that can save resources by significantly reducing the amount of paper used.

Another object of the present invention is to provide a disposable food container capable of improving print quality and reducing printing costs by printing product designs and necessary information on thin paper.

Another object of the present invention is to provide a method for manufacturing a disposable food container capable of reducing manufacturing cost by simplifying the manufacturing process.

The above and other objects of the present invention can all be achieved by the present invention described in detail below.

The disposable food container made of the polypropylene foam sheet according to the present invention is characterized in that the container body is made of a polypropylene (PP) foam sheet and a sheet in which printing paper on which necessary information including product design is printed is laminated. .

The PP foam sheet and the printing paper laminated sheet have a thickness of 0.7 to 1.5 mm, the weight ratio of the printing paper and the PP foam sheet is 1: 1.5 to 1: 2.5, and the foaming ratio of the PP foam sheet is 20 to 50 times. desirable.

In the process of producing a PP foam sheet having a foaming ratio of 20 to 50 times, the sheet in which the PP foam sheet and the printing paper are laminated is put in the printing paper before the foam sheet is solidified (solidified), The foam sheet and the printing paper are laminated. The sheet in which the PP foam sheet and printing paper are laminated is cut so that individual containers can be formed in the existing equipment, the cut sheet is put into the existing equipment to manufacture the container body, and the bottom of the manufactured container body is placed on the bottom. Glue the members together.

When the PP foam sheet foamed at a magnification of 20 to 50 times has a thickness of 1 mm, it has excellent thermal insulation properties to the extent that the skin (hands) does not feel hot even when heated in a microwave or using hot water.

Hereinafter, specific details of the present invention will be described with reference to the accompanying drawings.

The present invention satisfies all the requirements that must be used in a microwave oven, including the characteristics of a disposable food container, such as formability, waterproofness, heat resistance, and heat insulation, and can significantly reduce the amount of paper used to save resources, product design and By printing necessary information on thin paper, we provide disposable food containers that can improve print quality and reduce printing costs, and provide a method of manufacturing disposable food containers that can reduce manufacturing costs by simplifying the manufacturing process. has the effect of the invention.

1 is a schematic perspective view of a conventional conventional disposable food container made of a sheet in which an unfoamed PE film is laminated on thick paper.
FIG. 2 is an enlarged cross-sectional view taken along line A-A' of the container of FIG. 1 .
3 is a schematic exploded perspective view in which the main body container 7 and the outer packaging cover 8 are separated from the container of FIG. 1 .
4 is a schematic enlarged cross-sectional view taken along line A-A' of the container body according to the present invention.
5 is an exploded view of a sheet cut to form one container body from a sheet in which a PP foam sheet and a printing paper are laminated according to the present invention.

The present invention relates to a disposable container for packaging various instant foods, including various noodles, in a semi-cooked state. it's about

1 is a schematic perspective view of a conventional conventional disposable food container made of a sheet in which an unfoamed PE film is laminated on thick paper. A conventional disposable food container is a container made of a sheet in which a plastic film (unfoamed PE film) is laminated on thick paper.

FIG. 2 is an enlarged cross-sectional view taken along line A-A' of the container of FIG. 1 . The non-foamed PE film (2) is coated on the inner surface of the body paper (1) made of thick paper to give waterproofness. In general, since thick paper with a thickness of 1 mm is used, the formability as a container can be maintained.

3 is a schematic exploded perspective view in which the main body container 7 and the outer packaging cover 8 are separated from the container of FIG. 1 . The sheet coated with the unfoamed PE film 2 on the inner surface of the body paper 1 is cut according to the shape of the container to be manufactured, and the body container 7 is manufactured using an automated facility. The upper rim 6 of the body container is also formed by automated equipment. The bottom member (not shown) attached to the lower part of the body container 7 and the lid (not shown) on the upper part are also operated by automated equipment. Automated equipment for manufacturing such a body container can be easily implemented by a person skilled in the art to which the present invention pertains.

The outer packaging cover 8 is manufactured separately from the main body container 7 as a thick printing paper 3 on which necessary information including a product design is printed.

A solid adhesive 4 having a bulky feeling is attached to the outer surface of the manufactured body container 7 at a plurality of positions. The body container 7 is inserted into the manufactured outer packaging cover 8 and adhered by an adhesive 4 . A cross-sectional view of the container thus manufactured is shown in FIG. 2 .

Thick printing paper (3) on which an unfoamed PE film (2) is coated on the inner surface of the main body paper (1), and a plurality of solid adhesives (4) are attached to the outer surface of the body paper (1), and necessary information including product design is printed is attached Since the adhesive 4 has a bulky feeling, an air layer 5 is formed between the body paper 1 and the printing paper 3 . This air layer 5 forms a heat insulating layer. However, in the case of holding the container by hand, it is difficult to expect perfect thermal insulation because the main body paper 1 and the printing paper 3 come into contact with each other. Relatively thick paper is used in order to maintain the formability of the printing paper 3 and to supplement thermal insulation. In order to print the necessary content on the thick paper, the printing cost is higher than when printing on thin paper, and the print quality is also not good.

In the disposable food container of the present invention, the container body is manufactured by a sheet in which a printing paper 20 is laminated on a polypropylene (PP) foam sheet 10 .

4 is a schematic enlarged cross-sectional view taken along line A-A' of the container body according to the present invention. The PP foam sheet 10 and the printing paper 20 laminated sheet have a thickness of 0.7 to 1.5 mm, and the weight ratio of the printing paper 20 and the PP foam sheet 10 is 1:1.5 to 1:2.5, The expansion ratio of the PP foam sheet 10 is preferably 20 to 50 times. When the expansion ratio is 20 times or less, sufficient heat insulation cannot be secured, and when the expansion ratio is 50 times or more, the strength of the sheet is weakened and it is difficult to maintain the shape of the container.

Necessary information including a product design is printed on the printing paper 20 . In the container of the present invention, since the PP foam sheet 10 has sufficient formability and heat insulation, there is no need to use thick printing paper, and as thin as possible can be used. In the present invention, the printing cost is reduced and the printing quality is improved because the printing is performed using as thin paper as possible.

Before the PP foam sheet 10 and the printing paper 20 are laminated, the foam sheet 10 is solidified (solidified) in the process of manufacturing the PP foam sheet 10 having a foaming ratio of 20 to 50 times. The printing paper 20 is put in and the PP foam sheet 10 and the printing paper 20 are laminated by the foaming heat of polypropylene. Before lamination, the necessary information including the product design is printed on the printing paper 20 . This process can be easily carried out by a person skilled in the art in an existing PP foam sheet manufacturing facility.

The PP foam sheet 10 and the printing paper 20 laminated sheet are cut so that individual containers can be formed in the existing apparatus. 5 is an exploded view of a sheet cut to form one container body from a sheet in which a PP foam sheet and a printing paper are laminated according to the present invention. The sheet cutting operation can also be cut as before using the existing equipment.

A container body is manufactured by putting the cut sheet into an existing facility, and a bottom member (not shown) is adhered to the lower portion of the manufactured container body. The body container 7 to which the bottom member is attached is sealed with a lid (not shown) after containing the contents to produce a finished product. As the bottom member, a sheet in which a PP foam sheet and printing paper are laminated may be used as in the container body, or only a PP foam sheet in which printing paper is not laminated may be used. The bottom member (not shown) attached to the lower part of the body container 7 and the lid (not shown) on the upper part are also operated by an automated facility.

In the case of manufacturing a container with a sheet laminated with non-foamed PE film on conventional thick paper, the laminated body paper and printing paper are separately cut and molded, respectively, and then assembled through a two-step process, but in the present invention, the PP foam sheet In the process of manufacturing (10), the printing paper 20 is put in, the PP foam sheet 10 and the printing paper 20 are laminated, and the laminated sheet is cut once and molded once to simplify the manufacturing process. and, as a result, the manufacturing cost can be reduced.

When the PP foam sheet foamed at a magnification of 20 to 50 times has a thickness of 1 mm, it has excellent thermal insulation properties to the extent that the skin (hands) does not feel hot even when heated in a microwave or using hot water.

Simple modifications or changes of the present invention can be easily carried out by those of ordinary skill in the art, and all such modifications or changes can be considered to be included in the scope of the present invention.

1: Body paper 2: PE film
3: Printing Paper 4: Glue
5: air layer 6: upper rim
7: body container 8: outer packaging cover
10: PP foam sheet 20: printing paper
30: cut sheet of container

Claims (4)

Disposable food container, characterized in that the container body is made of a sheet in which a polypropylene (PP) foam sheet (10) and a printing paper (20) on which necessary information including a product design is printed are laminated.
According to claim 1, wherein the PP foam sheet (10) and the printing paper (20) laminated sheet has a thickness of 0.7 to 1.5 mm, the weight ratio of the printing paper (20) and the PP foam sheet (10) is 1: Disposable food container, characterized in that 1.5 to 1:2.5, and the expansion ratio of the PP foam sheet (10) is 20 to 50 times.
manufacturing a printing paper 20 on which necessary information including a product design is printed;
preparing a PP foamed sheet 10 having an expansion ratio of 20 to 50 times; and
Before the PP foam sheet 10 is solidified (solidified), the printing paper 20 is put in and the PP foam sheet 10 and the printing paper 20 are laminated by the foaming heat of polypropylene;
A method of manufacturing a sheet for manufacturing a disposable food container in which a PP foam sheet and a printing paper are laminated, comprising the steps of:
4. The sheet according to claim 3, wherein the PP foam sheet 10 and the printing paper 20 laminated sheet have a thickness of 0.7 to 1.5 mm, and the weight ratio of the printing paper 20 and the PP foam sheet 10 is 1: A method of manufacturing a sheet for manufacturing a disposable food container in which a PP foam sheet and a printing paper are laminated, characterized in that 1.5 to 1:2.5.

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