JPH11334716A - Paper insulation container - Google Patents

Abstract

(57) [Abstract] [Problem] It is made of paper as the main material and has easy disposal and incineration properties.
To provide a paper heat insulating container having a good printing effect and a high heat insulating effect in a foam layer. At least a body portion of a paper cup is composed of a paper cup base paper having thermoplastic resin layers laminated on both surfaces, and a paper tubular body has a thermoplastic resin layer laminated at least inside. A thermoplastic resin layer 113 composed of a paperboard 211 and outside the trunk of the paper cup;
And the thermoplastic resin layer 212 inside the cylindrical body forms a foamed resin layer, and is pressed or fused to each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper heat insulating container for storing instant noodles and the like, and more particularly, to a paper heat insulating material for so-called instant food or instant beverage which can be poured and consumed as it is by pouring boiling water. For containers.

[0002]

2. Description of the Related Art Conventionally, as a heat insulating container for pouring hot water into a container such as instant noodles and eating the same, for example, a plastic container formed of expanded polystyrene resin or the like, a corrugated paper on the outer wall of a water-resistant paper cup body. And then,
After forming a coating film of foaming ink or the like on the paper container on which the air insulation layer is formed by sticking thin paper on the corrugated paper, and then forming the coating film by heating or the like, the foaming layer is formed by heating or the like. Formed containers and the like are known.

[0003] However, containers made of foam resin are excellent in heat insulating properties, but have high combustion calories,
There is a problem in incineration and disposal, and furthermore, there is a demand for an easily disposable and easily combustible container which can be changed to a foamed resin due to a change in consumption behavior accompanying an increase in consumer awareness of the environment.

Further, a paper container in which a corrugated paper or a thin paper is wound and adhered to a paper cup to form an air heat-insulating layer has no problem in heat insulation, but requires a gluing step since an adhesive is used. High cost.

Further, a heat insulating container is known in which a thermoplastic resin is laminated on the side wall of a paper cup and the thermoplastic resin on the side wall is foamed by heating the paper cup. This container has a thickness of foam layer. When it is at most about 0.3 mm, the heat insulation is insufficient, and the printed display becomes unclear because the foam layer is provided on the print layer. Means for attaching the cylinder to the surface of the foam layer to enhance the printing effect is also conceivable, but it is necessary to adhere both members with an adhesive, and the adhesive that can be adhered to the foam layer has a problem of odor generation. Yes, not suitable for containing food as a content.

[0006]

SUMMARY OF THE INVENTION The present invention focuses on the above-mentioned problems relating to a heat-insulating container, and more particularly, the problem of a heat-insulating container of the type in which a foam layer is formed on the side wall of the container to provide a heat insulating effect. With paper as the main material, easy disposal, easy incineration, good print display effect,
An object of the present invention is to provide a paper heat insulating container having a high heat insulating effect in a foam layer.

[0007]

In order to achieve the above object, according to the first aspect of the present invention, a body and a bottom are provided.
A paper heat insulating container comprising a paper cup having a lip whose outer periphery is curled outward, and a paper cylinder positioned outside the trunk, wherein at least the trunk of the paper cup is a thermoplastic resin on both surfaces. The paper cup is made of paperboard with a thermoplastic resin layer laminated on at least the inside, and the thermoplastic resin layer on the outside of the body of the paper cup and the thermoplastic resin on the inside of the cylinder. The resin layer forms a foamed resin layer.

According to a second aspect of the present invention, the thermoplastic resin forming the thermoplastic resin layer on the outside of the body and the thermoplastic resin forming the inside of the cylindrical body include a thermoplastic resin layer on the inside of the body. And a lower melting point than the thermoplastic resin forming the outside of the cylindrical body.

Here, the thermoplastic resin is a polyethylene resin (PE).

[0010]

As described above, according to the present invention, at least the body of the paper cup is made of a paper cup base paper having a thermoplastic resin layer laminated on both sides, and the paper cylinder has a thermoplastic resin layer laminated at least on the inner surface. Since the thermoplastic resin layer on the outside of the body of the paper cup and the thermoplastic resin layer on the inside of the cylinder form a foamed resin layer, the heat insulating effect is high.

The thermoplastic resin forming the thermoplastic resin layer on the outside of the body and the thermoplastic resin forming the inside of the cylinder have a lower melting point than the thermoplastic resin forming the thermoplastic resin layer on the inside of the body. The foamed resin layer can be formed without impairing the housing function of the container without foaming the thermoplastic resin inside the container.

Further, if PE is used as the thermoplastic resin, workability is good.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to embodiments. The paper heat insulation container of the present invention is, for example, shown in FIG.
As shown in FIGS. 1A and 1B, a paper cup 10 including a body 11 and a bottom 12 and having an edge 13 curled outward on the periphery of an opening, and a cylindrical body 20 covering the body of the paper cup. Consists of

The body 11 has a basic structure of a laminated structure of [inside] thermoplastic resin layer 112 / paper cup base paper 111 / thermoplastic resin layer (foamed resin layer) 113 [outside]. Then, the cylindrical body 20 is formed of [inside] thermoplastic resin layer (foamed resin layer) 212 / board paperboard 211 / thermoplastic resin layer 213 [outside] or [inside] thermoplastic resin layer (foamed resin layer) 212 / boardboard. The basic configuration is a laminated configuration including 211 [outside].

The paper cup 10 can be manufactured from a body member forming the body and a bottom member forming the bottom using a general paper cup forming machine.

The body member has a basis weight of 170 to 310 g / m ^2.
Of paper cup base paper 111 as a base material, and a thermoplastic resin such as PE, polypropylene resin (PP), or polyethylene terephthalate resin (PET), which can be thermally bonded, is applied to both surfaces of the base material by a melt extrusion method to a thickness of about 15 to 40 μm. Processed paper can be used.

Here, it is necessary that the thermoplastic resin applied to the inside of the base material and the thermoplastic resin applied to the outside of the base material have different melting points. That is, the thermoplastic resin applied to the outside, which is the side in contact with the cylindrical body, has a lower melting point than the thermoplastic resin applied to the inside. The reason is that even if the thermoplastic resin layer on one side foams when heated, the thermoplastic resin layer on the other side does not foam.

The cylinder 20 has a basis weight of 120 to 350 g / m.
^Using about ² paperboards 211 such as white liner, coated ball, bleached kraft, ivory, etc. as the base material, melt the thermoplastic resin such as PE, PP, PET etc. on the inner surface or both surfaces about 15-40 μm. Processed paper coated by the extrusion method can be used. After cutting the processed paper to a predetermined size, the both ends are overlapped and thermocompression-bonded or the like to form a tubular body having a trapezoidal cross section. At this time, the inner diameter of the cylindrical body is set slightly larger (about 0.5 to 1 mm) than the outer diameter of the body of the paper cup in consideration of the thickness of the foamed resin layer described later.

Here, when a thermoplastic resin is applied to both sides of the substrate, the thermoplastic resin applied to the inside of the substrate is
The thermoplastic resin applied to the outside of the base material is similar to the trunk member,
It is necessary to use different types of melting points. That is,
As the thermoplastic resin applied to the inner side, which is in contact with the body member, a resin having a lower melting point than the thermoplastic resin applied to the outer side is used. The thermoplastic resin forming the thermoplastic resin layer on the outside of the body and the thermoplastic resin forming the thermoplastic resin layer on the inside of the cylindrical body can easily perform the foaming operation described below when using resins having the same melting point. It can be carried out.

When the basis weight of the cylindrical base material is 120 g / m ² or less, the rigidity is reduced, so that the base material is deformed when held by hand,
Further, since the paper thickness is reduced, the heat insulating effect is inferior, and furthermore, tearing or the like is apt to occur during the manufacturing process, and the handling becomes difficult. When the basis weight is 350 g / m ² or more, the rigidity becomes too strong,
The repulsive force is increased, and the problem of peeling after fitting into the paper cup also occurs. For these reasons, the basis weight of the base material used for the cylindrical body is preferably about 120 to 350 g / m ² .

The cylindrical body 20 manufactured as described above is inserted into a separately manufactured paper cup 10 from the bottom to just below the lip 13 so as to cover the entire body, and the cylindrical body is fitted into the body of the paper cup. Condition

The container in which the cylindrical body and the paper cup are integrated is placed in, for example, a drying furnace and heated, so that the thermoplastic resin layer 113 on the outside of the body and the thermoplastic resin layer 21 on the inside of the cylindrical body are heated.
2 are melt-foamed to form a foamed resin layer, and are pressed and / or fused to produce the paper-made heat insulating container 1 of the present invention.
The foaming phenomenon does not occur between the thermoplastic resin layer 112 inside the trunk and the thermoplastic resin layer 213 outside the cylindrical body because the thermoplastic resin forming the resin layer has a high melting point. Therefore, even if the print display layer is provided on the outside of the cylindrical body, the print display layer does not become unclear.

It is also possible not to apply a thermoplastic resin to the outside of the cylindrical body (see FIG. 2). A foamed resin layer can also be provided on the outside of the cylindrical body by laminating a thermoplastic resin having a low melting point similarly to the inside.

In order to increase the foaming efficiency of the thermoplastic resin and to form a thicker foamed resin layer, an organic solvent-containing ink, a transparent varnish, or the like can be provided on the entire surface or a part of the substrate on which the foamed resin layer is provided. . In addition, by partially providing these inks and varnishes, the foamed resin layer can be formed in an uneven shape.

[0025]

EXAMPLES Examples of the present invention will be described below more specifically. <Example 1> First, a laminated material having the following structure was prepared for both a trunk member forming a trunk and a bottom member forming a bottom.
That is, first, a high-density polyethylene resin (HDPE was laminated to a thickness of 20 μm by a melt extrusion method (resin temperature: 300 ° C.) on one surface of a cup base paper having a basis weight of 220 g / m ² , and then HDPE was laminated. 20 μm of low density polyethylene resin (LDPE) on the side without
Laminated by melt extrusion method (resin temperature: 300 ° C.), [inside of container] 20 μm thick HDPE112
/ 220g / m ² cup base paper 111 / 20μm thick LDP
A laminated material having a structure of E113 [outside the container] was produced.

A body member for forming a body portion and a bottom member for forming a bottom portion having predetermined dimensions are manufactured from the laminated material, and a height of 105 mm and a diameter of 95 m are formed using a general paper cup molding machine.
m, a paper cup 10 having a bottom diameter of 65 mm was prepared.

Separately, as processed paper for a cylinder, a basis weight of 230
The same LDPE as the resin used for the paper cup was laminated on one side of a white liner of g / m ² to a thickness of 20 μm by a melt extrusion method (resin temperature: 300 ° C.).
0 μm thick LDPE 212/230 g / m ² white liner 2
A laminated material having an 11 [outer container] configuration was prepared. A printed display layer is provided on the surface of the white liner on which the LDPE is not laminated (not shown).

The processed paper for cylinder was cut into a fan-shaped predetermined size, and both ends were overlapped and heat-sealed to produce a cylinder 20 having a trapezoidal cross section.

The cylindrical cup 20 is made of the paper cup 10 previously prepared.
The paper cup is inserted from the bottom to the position just below the lip 13 so as to cover the whole body, so that the body of the paper cup is covered with the cylinder. A container in which the cylinder and paper cup are integrated is 100 to 18
When heated in a drying oven at 0 ° C, LDP on the outside of the body
E113 and the LDPE 212 inside the cylindrical body were melt-foamed to form a foamed resin layer and were heat-sealed to produce the paper heat insulating container of the present invention (see FIG. 2).

The shape of the paper cup is not limited to the tapered shape whose diameter increases upward as shown in the present embodiment, but may be a cylindrical shape having the same diameter both above and below.

In order to evaluate the heat insulating effect of this paper heat insulating container, instant noodles were poured into the container, poured into boiling water and allowed to stand for 3 minutes, and then the body of the container was gripped with fingers or the like. There was no. Also, even when the container was tilted upside down, the cylinder did not come off the paper cup.

[0032]

As described above, the paper-made heat insulating container of the present invention comprises:
Since the foamed resin layer is doubled on the paper cup side and the cylindrical body side to increase the thickness, the heat insulating property is improved. In addition, since there is a print display layer on the surface of the cylindrical body, clear print display is possible. further,
Since the bonding between the paper cup and the paper cylinder is performed in the resin foaming step, the use of an adhesive is not required, and the smell of the adhesive is eliminated.

[Brief description of the drawings]

FIG. 1 (a) is an explanatory side view of an embodiment of the present invention, in which a part of a paper heat insulating container is cut away, and FIG. 1 (b) is an enlarged cross-sectional explanatory view of part A of the same. .

FIG. 2 is an enlarged sectional explanatory view of a portion A in another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF REFERENCE NUMERALS 1 {paper insulation container 10} paper cup 11} trunk 12} bottom 13} edge 20} paper cylinder 111 {paper cup base paper 112} thermoplastic resin layer 113} thermoplastic Resin layer, foamed resin layer 211 {paperboard 212} thermoplastic resin layer, foamed resin layer 213 {thermoplastic resin layer

Claims (3)

[Claims] An insulated paper container comprising a paper cup having a body portion and a bottom portion and having a rim portion whose outer periphery is curled outward, and a paper cylinder positioned outside the body portion. At least the body of the paper cup is made of a paper cup base paper having a thermoplastic resin layer laminated on both sides, and the paper cylinder is made of paperboard having a thermoplastic resin layer laminated at least on the inside. A heat insulating container made of paper, wherein an outer thermoplastic resin layer and a thermoplastic resin layer inside a cylindrical body form a foamed resin layer and are pressed or fused to each other. 2. The thermoplastic resin forming the thermoplastic resin layer on the outside of the body and the thermoplastic resin forming the inside of the cylindrical body are smaller than the thermoplastic resin forming the thermoplastic resin layer on the inside of the body. The paper-made heat insulating container according to claim 1, which has a low melting point. 3. The paper insulation container according to claim 1, wherein said thermoplastic resin is a polyethylene resin.