JP2003261128A - Heat insulation paper cup having barrier function - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat insulation paper cup having a barrier function. <P>SOLUTION: A body member composes at least the body (11) of a paper cup comprising the body (11) and the bottom (12) and having a mouth edge (13) in which the peripheral edge of the opening is curled outside. The body member comprises a composite sheet in which, from outside in order, a cup base paper (1), a barrier layer (2), and a sealant layer (3) are bonded together into a laminate. The cup base paper (1) which is used is made in such a manner that a microcapsule type expanding agent (4) which expands under heat is added in the process of paper making. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat insulating paper cup consisting only of a paper cup body, and more particularly to a heat insulating paper cup having a gas barrier property and a water vapor barrier property and comprising only a paper cup body.

[0002]

2. Description of the Related Art Conventionally, products such as miso soup and cup soup having a heat insulating property requiring a barrier function such as moisture proof and gas permeability are generally powdered miso soup. It is sold in a soft packaging bag in which aluminum foil and aluminum soup are laminated, and the filled soft packaging bag is put together with a paper cup.

However, in this method, a double packaging type of a paper cup soft packaging bag is used and the cost is increased. In addition, the double packaging format increases the total amount of waste discarded after use. When the food is cooked by the consumer, the operation of breaking the bag, transferring the contents in the bag to the cup, and then starting the cooking is required, and the work for cooking becomes complicated, which is a disadvantage. .

[0004]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems relating to a container for storing a product such as a soft packaging bag and a paper cup that are sold together. An object is to provide a heat insulating paper cup having a barrier function.

[0005]

According to a first aspect of the present invention, there is provided a body member which forms at least a body portion of a paper cup having a body portion and a bottom portion, and a peripheral edge of the opening portion curled outward. , A composite sheet in which a cup base paper / barrier layer / sealant layer is sequentially laminated from the surface side, and the cup base paper is made by adding a heat-expandable microcapsule type foaming agent in the paper making process. It is a heat insulating paper cup having a barrier property, which is a cup base paper.

As described above, according to the first aspect of the present invention, the body member forming at least the body portion of the paper cup having the rim portion having the body portion and the bottom portion and the peripheral edge of the opening portion curled outward is the surface. A cup base paper made of a composite sheet in which a cup base paper / barrier layer / sealant layer is sequentially laminated from the side, and the cup base paper is made by adding a heat-expandable microcapsule type foaming agent in the paper making process. The heating of the molded cup causes the microcapsules to expand, which expands the gaps between the fibers of the paper, lowering the density of the paper, making the cup more heat-insulating and insulating with a barrier property. It becomes a paper cup.

According to a second aspect of the present invention, in the first aspect of the invention, half of the thickness of the composite sheet is deleted from the tip by a predetermined length inside the joint portion of the cylindrical body of the paper cup. It is a heat insulating paper cup having barrier properties, characterized in that the remaining half of the scraped back is folded back so that the deleted surface is on the inside, and is protected.

As described above, according to the second aspect of the present invention, the inside of the joining portion of the cylindrical body portion of the paper cup is removed by removing a half of the thickness of the composite sheet by a predetermined length from the tip and scraped off. Since the paper edge surface protection is performed by folding back half of the paper with the deleted surface facing inward, a high degree of barrier property can be imparted.

The invention of claim 3 is the same as claim 1 or 2.
In the invention, the barrier layer is an aluminum foil (A
It is a barrier insulating paper cup characterized in that it is l).

The invention of claim 4 is the same as claim 1 or 2.
In the invention, the barrier layer is a composite film in which a polyethylene terephthalate (PET) film is laminated on Al, which is a barrier heat insulating paper cup.

The invention of claim 5 is the same as claim 1 or 2.
In the invention, the barrier layer is an inorganic compound vapor-deposited plastic film, which is a heat insulating paper cup having a barrier property.

The invention of claim 6 is the same as claim 1 or 2.
In the invention, the barrier layer is an ethylene vinyl alcohol copolymer resin (EVOH) film, which is a barrier insulating paper cup.

The invention of claim 7 is the same as claim 1 or 2.
In the invention described above, the barrier layer is a PET film, which is a heat insulating paper cup having a barrier property.

Thus, in addition to Al in the barrier layer, Al
By using various films such as composite film of PET / PET film, plastic film with inorganic compound vapor deposition, EVOH film, PET film, etc., in addition to gas barrier properties, perfume barrier properties and pinhole prevention during paper cup molding are added. The barrier layer can be selectively used depending on the contents to be stored, the storage period, and the like.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION The barrier insulating paper cup of the present invention will be described below in detail based on one embodiment. The barrier insulating paper cup of the present invention is, for example, as shown in FIGS. 1 (a) and 1 (b).
As shown in FIG. 3, the body member constituting at least the body portion of the paper cup having the body portion (11) and the bottom portion (12) and having the rim portion (13) in which the peripheral edge of the opening is curled outward, It is composed of a composite sheet (5) in which a base paper (1) / barrier layer (2) / sealant layer (3) are sequentially laminated. The cup base paper (1) is a barrier heat insulating paper cup (10) made of a cup base paper which is made by adding a thermally foamable microcapsule type foaming agent (4) in the paper making process.

Further, for example, as shown in FIG. 2, half of the thickness of the composite sheet (5) is deleted from the tip by a predetermined length on the inside of the joint portion (15) of the body portion (11) of the paper cup. By applying the paper end surface treatment (16) in which the scraped remaining half is folded back so that the deletion surface is on the inside, the paper end surface is prevented from directly touching the stored contents, and the gas barrier property is improved, Water resistance is further improved when a liquid is contained.

Next, the composite sheet (5) constituting the paper cup will be described in detail. The cup base paper (1) is a layer that maintains the shape retention of the cup, and the basis weight is changed according to the size of the paper cup. Generally, 100-450 g / m ²
A cup base paper having a basic weight of about 3 is preferably used. A printing layer can be provided if necessary.

In the present invention, in order to impart heat insulating property to the cup base paper, a heat-foaming microcapsule type foaming agent (4) is added in an amount of 1.0 to 50.0 to the weight of pulp in the paper making process. Add about%.

As the thermally foamable microcapsule type foaming agent (4), for example, an inner foaming agent made of a chemical foaming agent such as carbonate is coated with a thermoplastic resin such as urethane on its outer surface. And the like can be preferably used.

Thus, since the outer surface of the internal foaming agent made of a chemical foaming agent such as carbonate is covered as a shell with a thermoplastic resin film such as urethane, the generated gas expands the microcapsules. Extends the gaps between the paper fibers to reduce the density of the cup base paper and give it heat insulation.

The barrier layer (2) is a layer which is located between the cup base paper (1) and the sealant layer (3) described below and which maintains the gas barrier property, the water vapor barrier property and the aroma retaining property of the paper cup. Various materials can be used depending on the contents to be stored.

That is, when water vapor barrier property, oxygen barrier property, light shielding property, and fragrance barrier property are required, Al is used.
In order to prevent pinholes during cup molding, it is preferable to use a composite film made of an Al / PET film.

When water vapor barrier property, oxygen barrier property, and fragrance barrier property are required without using Al, uniaxially or biaxially stretched PET film, polyamide film, stretched film such as polyolefin film, etc. It is possible to use an inorganic compound vapor deposition film in which a thin film of an inorganic compound of aluminum oxide or silicon oxide is provided on the above by a vapor deposition method such as physical vapor deposition or chemical vapor deposition to a thickness of about 20 to 100 nm. When the water vapor barrier property and the oxygen barrier property are required, an EVOH film can be used. If a fragrance barrier property is required, a PET film may be used.

The sealant layer (3) is a composite sheet (5).
Is placed in the innermost layer of the paper cup and plays a role of an adhesive layer when one end and the other end of the body member forming the body part of the paper cup are overlapped and joined, or when the body member and the bottom member are joined. . Therefore, heat fusion property is required, and generally low density polyethylene resin, linear low density polyethylene resin (L-LDPE)
And the like can be preferably used. The thickness of the sealant layer (3) is
Generally, the thickness of about 20 to 50 μm is preferably used.

The composite sheet (5) can be easily produced by using a known laminating method such as a dry laminating method or a molten resin extrusion laminating method.

A heat-sealable layer (not shown) of low density polyethylene resin or the like may be provided on the other surface of the cup base paper (1) on which the barrier layer or sealant layer is not applied.

From this composite sheet (5), a body member blank and a bottom member roll having predetermined dimensions are produced, and a paper cup having a predetermined dimension is produced using a generally known paper cup molding machine.

By heating the finished paper cup in a heating furnace to expand the microcapsule type foaming agent (4) contained in the cup base paper, the gaps between the fibers of the paper are expanded and the density is lowered to provide heat insulation. Use a paper cup.

[0029]

As described above, by using the barrier insulating heat-insulating paper cup of the present invention, it is possible to reduce the total packaging material, filling cost and dust as compared with the conventional combination method of the soft packaging bag and the paper cup. You can Also, the consumer's cooking procedure can be simplified.

[Brief description of drawings]

1A and 1B are partial cross-sectional explanatory views, and FIG. 1B is an enlarged cross-sectional explanatory view of a portion A of FIG.

FIG. 2 is an enlarged explanatory view of a joint portion (B portion in FIG. 1A) of a body portion of the barrier insulating paper cup of the present invention.

[Explanation of symbols]

1 ... Cup base paper 2 ... Barrier layer 3 ... Sealant layer 4 Foaming agent 5: Composite sheet 10 ... Insulating paper cup with barrier property 11 ... torso 12 ... bottom 13 rim 15 ... Joined part 16: Paper edge processing

Claims (7)

[Claims] 1. A body member constituting at least a body portion of a paper cup having a body portion and a bottom portion and having a rim portion in which a peripheral edge of an opening portion is curled outwardly.
The sealant layer is composed of a composite sheet sequentially laminated, the cup base paper is characterized in that in the paper making step of the paper is a cup base paper made by adding a thermally foamable microcapsule type foaming agent, Barrier insulation paper cup. 2. The inside of the joined portion of the cylindrical body of the paper cup is formed by removing half of the thickness of the composite sheet from the tip by a predetermined length, and folding back the remaining half so that the surface to be removed is on the inside. The barrier insulating paper cup according to claim 1, characterized in that the end face of the paper is protected. 3. The barrier insulating paper cup according to claim 1, wherein the barrier layer is an aluminum foil. 4. The barrier insulating paper cup according to claim 1, wherein the barrier layer is a composite film obtained by laminating a polyethylene terephthalate film on an aluminum foil. 5. The barrier insulating paper cup according to claim 1, wherein the barrier layer is an inorganic compound vapor-deposited plastic film. 6. The barrier layer is an ethylene vinyl alcohol copolymer resin film, wherein the barrier layer is an ethylene vinyl alcohol copolymer resin film.
Alternatively, the heat insulating paper cup having a barrier property according to the item 2. 7. The barrier insulating paper cup according to claim 1, wherein the barrier layer is a polyethylene terephthalate film.