JPH06122445A - Paper container for black tea or coffee distributed in chilled state - Google Patents

Abstract

PURPOSE:To obtain a paper container utilized when distributing tea or coffee drink in a chilled condition, which is excellent in keeping the quality of the tea or coffee drink as the contents and which is provided with a resin layer having a good heat-sealing performance as an inner surface layer necessary for boxing of a paper container. CONSTITUTION:A paper container is used for tea or coffee drink distributed in a chilled condition and provided with an inner surface resin layer in a laminated sheet as the inner surface of the tea or coffee container made of a laminated material composed of a packing base material and the inner surface resin layer having a heat-sealing characteristic laminated thereon. The inner surface resin layer having a heat-sealing characteristic is constituted of noncrystalline or low crystalline denatured polyethylene terephthalate resin having 40C or more in the glass-trasition temperature.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper container for enclosing tea or coffee to be chilled.

[0002]

2. Description of the Related Art Paper containers containing various beverages are
A laminated sheet in which the inner surface resin layer contacting with the inner filler is formed of a polyolefin-based resin layer so that the sealed portion of the paper container can be formed by the heat-welding ability of the laminated sheet forming the paper container. It is made by using the box.

[0003]

A paper container obtained by box-making a laminated sheet having an inner surface resin layer of the above-mentioned polyolefin resin is tea or coffee that can be drunk as it is, that is, chilled-distributed tea or coffee. When the exudate is encapsulated, the polyolefin resin layer forming the inner surface resin layer has high properties such as sorbing or permeating the flavor component in the tea or coffee beverage,
Poor storage performance for tea or coffee beverages.

On the other hand, according to the present invention, the property of sorbing or permeating the flavor component contained in tea or coffee for beverage is extremely small, and moreover, the heat required for making a paper container is required. Provided is a paper container provided with a resin layer having good sealing performance as an inner surface resin layer.

[0005]

The paper container for chilled-circulated tea or coffee according to the present invention has a heat-sealing property which is laminated on a packaging base material and the packaging base material. It is obtained by forming a laminated sheet comprising an inner surface resin layer so that the inner surface resin layer in the laminated sheet becomes the inner peripheral surface layer of the container.

In the paper container for chilled-circulated tea or coffee according to the first aspect of the present invention, the heat-sealable inner surface resin layer on the side in contact with the tea or coffee beverage in the paper container has a glass transition temperature. Is formed of an amorphous to low crystalline modified polyethylene terephthalate resin at 40 ° C. or higher.

In the paper container for chilled-circulated tea or coffee according to the second aspect of the present invention, the heat-sealable inner surface resin layer of the paper container is amorphous with a glass transition temperature of 40 ° C. or higher. A laminated resin layer including a first resin layer made of a low-crystalline modified polyethylene terephthalate resin, a second resin layer made of an adhesive polyolefin resin, and a third resin layer made of a polyolefin resin, The first resin layer of the laminated resin layer is laminated on the packaging material base material so as to form an outer layer.

In the paper container for chilled-circulated tea or coffee according to the third aspect of the present invention, the above-mentioned heat-sealable inner surface resin layer in the paper container has a glass transition temperature of 4 or less.
A polyolefin system having a first resin layer made of an amorphous to low crystalline modified polyethylene terephthalate resin at 0 ° C. or higher and a carboxyl group having a corona discharge treatment on the laminated surface of the first resin layer. Second by resin film
And the first resin layer in the laminated resin layer are laminated on the packaging material base material so as to form an outer layer.

In the chilled-circulated paper container for tea or coffee of the present invention having the above-mentioned constitution, the amorphous to low crystalline modified polyethylene terephthalate resin layer having a glass transition temperature of 40 ° C. or higher has a crystallinity. It is formed of a non-crystalline to low crystalline modified polyethylene terephthalate resin such as 10% or less, and contains ethylene glycol and terephthalic acid as main components, and as a copolymerization component for the main components, a polyvalent polyhydric compound other than ethylene glycol is used. Polyester resin composed of a copolymer obtained by using a polyvalent carboxylic acid other than alcohol and / or terephthalic acid, specifically, one part of the terephthalic acid component is isophthalic acid, diphenyldicarboxylic acid, trimellitic acid, Modified polyethylene terephthalate resin replaced with adipic acid, sebacic acid, etc. Diethylene part of glycol component, propylene glycol, 1,4-cyclohexanedimethanol, modified polyethylene terephthalate have been replaced with trimethylolpropane phthalate resin,
Alternatively, it is formed of a mixed resin of polyethylene terephthalate resin and the modified polyethylene terephthalate resin.

The aforementioned modified polyethylene terephthalate resin
Specific examples of fats include ethylene glycol, isophthalic acid, and
Lephthalic acid, 1,4-cyclohexanedimethanol and ethanol
Tylene glycol, terephthalic acid, propylene glycol
Of a combination of dichlorobenzene, isophthalic acid, terephthalic acid, etc.
Polyester resin composed of co-condensation polymer and
Using phthalic acid and ethylene glycol as base materials
When polymerizing the reester resin, trimmerize part of the acid component.
There is the use of trivalent carboxylic acid such as Lit acid,
I, trimethylolpropane as a part of the alcohol component
And use trihydric alcohols such as
And 1 part acid component, trivalent carboxylic acid
Copolyester obtained by using cis and trihydric alcohol
It is a stell resin.

The resin layer formed of the modified polyethylene terephthalate resin in which the content of the aliphatic dicarboxylic acid component in the acid component is 10% by weight or more is not contained in the flavor component in the tea or coffee for beverage. It is not preferable because the adherence is lowered.

In the inner surface resin layer of the paper container of the second invention, examples of the adhesive polyolefin resin used as the second resin layer include low density polyethylene, ethylene-vinyl acetate copolymer and ethylene. A modified polyolefin resin obtained by graft-polymerizing a monomer having a functional group such as a carboxyl group or a carbonyl group to an α-olefin copolymer or the like is used.

The polyolefin resin forming the third resin layer in the inner surface resin layer of the paper container according to the second aspect of the invention includes, for example, low density polyethylene, ethylene-vinyl acetate copolymer, ethylene-α. Olefin copolymers, polyolefin polymers such as polypropylene are used.

The glass transition temperature of the first resin layer is 40 ° C.
The above-mentioned adhesive polyolefin-based resin laminated with the above amorphous to low-crystalline modified polyethylene terephthalate resin and the polyolefin-based resin have an excellent effect on impact resistance, and the first resin layer A sealing portion having an excellent sealing strength due to the inner surface resin layer is obtained.

The second resin layer used as the inner surface resin layer of the paper container of the third invention, that is, the second resin layer made of a polyolefin resin film having a carboxyl group, may be, for example, ethylene- Acrylic acid copolymers, ethylene-methacrylic acid copolymers, ionomers, and copolymers obtained by copolymerizing these polymers with other polymerizable monomers are used. In particular, when the second resin layer is formed by a copolymer obtained by copolymerizing a monomer having an ester group such as methyl acrylate or ethyl methacrylate as the third component, The adhesion is extremely good. The corona discharge treatment applied to the surface of the second resin layer by the polyolefin-based resin film having a carboxyl group enhances the adhesive force with the first resin layer.

A laminated sheet made of a polyolefin resin layer, a stretched film layer or the like is used as a base material for a packaging material on which an inner surface resin layer is laminated. Usually, the outer surface layer of a paper container is water resistant and heat welded. A laminated sheet having an outer surface layer formed of a polyolefin-based resin layer is used so as to obtain excellent properties.

[0017]

[Working] The paper container for chilled-circulated tea or coffee of each of the first to third inventions having the above structure has a glass transition temperature of 40 ° C. or higher in a laminated sheet constituting the paper container. An amorphous to low crystalline modified polyethylene terephthalate resin layer is formed in a box so as to come into contact with the inner filler in the paper container.

The amorphous to low crystalline modified polyethylene terephthalate resin layer having a glass transition temperature of 40 ° C. or higher is used as a flavor component in an atmosphere below the glass transition temperature of the modified polyethylene terephthalate resin constituting the resin layer. Has an excellent effect on the non-sorbing property of
In connection with this, the paper container in which the beverage containing the flavor component is enclosed is usually placed in an atmosphere at a temperature of less than 40 ° C. Therefore, in the paper container of the present invention, the flavor component is not added. Excellent non-sorption and non-permeability to the contained filler.

Further, the paper container for chilled-circulated tea or coffee according to the first to third inventions is a side of the laminated sheet constituting the paper container which comes into contact with the inner filler in the paper container. Of the resin layer, that is, the amorphous to low crystalline modified polyethylene terephthalate resin layer having a glass transition temperature of 40 ° C. or higher, and a main portion which forms a copolymerization portion of ethylene glycol and terephthalic acid, and a polymer other than ethylene glycol. Since it is formed of a resin composed of a secondary part that forms a copolymerization part with a polyhydric carboxylic acid other than hydric alcohol and / or terephthalic acid, the main part of the copolymerization part of ethylene glycol and terephthalic acid Of non-sorbing and non-permeability to flavor components due to co-polymerization of polyhydric alcohol other than ethylene glycol and / or polycarboxylic acid other than terephthalic acid Heat resistance can be obtained.

Further, the paper container for chilled tea or coffee according to the second aspect of the present invention is a laminated sheet constituting the paper container, which is in contact with the chilled tea or coffee in the paper container. The resin layer has a crystallinity of 1
A first resin layer made of a modified polyethylene terephthalate resin having an amorphous to low crystallinity of 0% or less, a second resin layer made of an adhesive polyolefin resin, and a third resin layer made of a polyolefin resin. It is composed of a laminated resin layer, and the presence of the second resin layer and the third resin layer exerts an excellent action in impact resistance. Therefore, the heat-sealing portion formed by the heat-bonding ability of the modified polyethylene terephthalate resin having a low crystallinity such that the first resin layer has an amorphousness to a crystallinity of 10% or less has seal strength and impact resistance. A heat-bonded portion having excellent properties is obtained.

In the paper container for chilled-circulated tea or coffee according to the third aspect of the present invention, in the laminated sheet constituting the paper container, the resin layer on the side in contact with the inner filler in the paper container is glass. A first resin layer made of an amorphous to low crystalline modified polyethylene terephthalate resin having a transition temperature of 40 ° C. or higher, and a carboxyl group having a corona discharge treatment applied to the laminated surface of the first resin layer. And a second resin layer laminated resin layer formed of a polyolefin-based resin film comprising: the presence of the second resin layer exerts an excellent effect in impact resistance; Excellent adhesion strength between the layer and the second resin layer is formed by corona discharge treatment applied to the surface of the polyolefin-based resin film having a carboxyl group.

Therefore, the amorphousness of the first resin layer
In the heat-sealed portion formed by the heat-bonding ability of the modified polyethylene terephthalate resin having a low crystallinity of 10% or less, a heat-bonded portion excellent in seal strength and impact resistance can be obtained.

[0023]

EXAMPLES The concrete constitution of the chilled paper container for tea or coffee according to the present invention will be described below with reference to examples.

Examples 1 to 5 and Comparative Example 1 Production of Laminated Sheet (1) After forming an extrusion coat layer of polyethylene resin having a thickness of 15 μ on one surface of a cardboard having a basis weight of 340 g / m ² , the cardboard was prepared. On the other side, a polyethylene resin layer having a thickness of 30 μm and an amorphous modified polyethylene terephthalate resin having a glass transition temperature of 71 ° C. (Mitsui DuPont Polychemical Co., Ltd.)
A co-extruded resin layer with a heat-sealable inner surface resin layer having a thickness of 40 μm by a sealer PT X 207) was laminated so that the inner surface resin layer was the outermost layer to obtain a laminated sheet.

Production of Laminated Sheet (2) After forming an extrusion coat layer of polyethylene resin having a thickness of 15 μ on one side of a cardboard having a basis weight of 340 g / m ² , a thickness of 30 μm is applied to the other side of the cardboard. An extrusion coating layer of polyethylene resin was formed to obtain a laminated material. Furthermore, the thickness of the laminated modified material made of an amorphous modified polyethylene terephthalate resin (Mitsui DuPont Polychemical Co., Ltd .: Sealer PT X 207) having a glass transition temperature of 71 ° C. on the surface of the polyethylene resin extrusion coating layer having a thickness of 30 μm. 20μ
Of the first resin layer of Adhesive Polyolefin Resin (Mitsui Petrochemical Industry Co., Ltd .: Admer SF 600) with a thickness of 10
a second resin layer having a thickness of 10 μm, and a third resin layer having a thickness of 10 μ made of a polyolefin resin (Mitsui Petrochemical Industry Co., Ltd .: Mirason 16P), and the third resin layer surface is an extrusion coating layer surface of polyethylene resin. Directly extruded and laminated so as to be in contact with each other, that is, with the first resin layer forming the outermost layer, to obtain a laminated sheet having a heat-sealable inner surface resin layer having a thickness of 40 μm.

Production of Laminated Sheet (3) Polyolefin Resin Having Carboxyl Group (Mitsui DuPont Polychemical Co., Ltd .: Nuclel AN4213 C
), A corona discharge treatment is applied to one surface of a film having a thickness of 20 μ, and the glass transition temperature is 71%.
A resin layer with a thickness of 20μ made of amorphous modified polyethylene terephthalate resin (Mitsui DuPont Polychemical Co., Ltd .: Sealer PTX 207) at ℃ was directly extruded and laminated to give a thickness of 40
A laminated film for the inner surface resin layer having a heat sealability of μ was obtained.

Then, an extrusion coat layer of a polyethylene resin having a thickness of 15 μ is formed on one side of a cardboard having a basis weight of 340 g / m ² , and a thickness of 30 μm is applied to the other side of the cardboard.
A laminated material having an extrusion coating layer of polyethylene resin of μ was obtained.

Subsequently, the laminated film for the inner surface resin layer having the heat-sealing property was applied to the polyethylene resin extrusion coat layer surface having a thickness of 30 μm of the laminate material and the polyethylene resin extrusion coat layer surface and the carboxyl group. A polyolefin resin having a carboxyl group and a first resin layer made of an amorphous modified polyethylene terephthalate resin having a glass transition temperature of 71 ° C. by thermocompression bonding so as to be in contact with the surface of a polyolefin resin film having A laminated sheet having an inner surface resin layer having a heat sealing property by a laminated resin layer having a thickness of 40 μm with the second resin layer made of a resin film was obtained.

Manufacture of Laminated Sheet (4) A paper surface of a cardboard having a basis weight of 340 g / m ² having an extrusion coating layer of a polyethylene resin having a thickness of 15 μm is subjected to a frame treatment, and then a polyethylene resin layer ( 25 μ) / adhesive polyolefin resin layer (5 μ) / amorphous modified polyethylene terephthalate resin having a glass transition temperature of 71 ° C. (Mitsui DuPont Polychemical Co., Ltd .: Sealer PT X 207) layer (15 μ) ,
The polyethylene resin layer was laminated so as to be in contact with the frame-treated surface to obtain a laminated sheet.

Manufacture of Laminated Sheet (5) A frame of a cardboard having a basis weight of 340 g / m ² having an extrusion coating layer of a polyethylene resin having a thickness of 15 μ is subjected to a frame treatment, and then the frame-treated surface has a thickness of 25 μ. An extrusion coating layer of polyethylene resin was formed. Then, on this 25 μm thick polyethylene resin layer surface, an adhesive polyolefin resin layer (5 μm) / amorphous modified polyethylene terephthalate resin (Mitsui DuPont Polychemical Co., Ltd .: Sealer PT X 207) layer having a glass transition temperature of 71 ° C. (15μ)
The coextrusion coating layer of was laminated so that the adhesive polyolefin resin layer was in contact with the surface of the polyethylene resin layer having a thickness of 25 μm to obtain a laminated sheet.

Manufacture of Laminated Sheet (6) After corona discharge treatment was applied to the paper surface of a cardboard having a basis weight of 340 g / m ² and having a 15 μm thick polyethylene resin extrusion coating layer, the corona discharge treated surface had a thickness of 30 μm. Of the modified polyolefin resin layer is extrusion-coated, and then the modified polyolefin resin layer surface is coated with an amorphous modified polyethylene terephthalate resin having a glass transition temperature of 71 ° C. and a thickness of 15 μm (Mitsui DuPont Polychemical Co., Ltd .: Sealer PTX).
The 207) layer was extrusion coated to obtain a laminated sheet.

Production of Laminated Sheet (7) A modified polyolefin resin layer (15μ) was extrusion-coated on one side of a cardboard having a basis weight of 340g / m ² and having a 15μ-thick polyethylene resin extrusion coating layer on the front and back. The surface of the extrusion coating resin layer was subjected to corona discharge treatment, and subsequently, the glass transition temperature of the corona discharge treated surface was 7
A layer (15 μ) of an amorphous modified polyethylene terephthalate resin (Mitsui DuPont Polychemical Co., Ltd .: Sealer PTX 207) layer (15 μm) at 1 ° C. was extrusion-coated to obtain a laminated sheet.

Production of Laminated Sheet (8) A cardboard having a basis weight of 340 g / m ² was subjected to corona discharge treatment on one side thereof, and then an extrusion coating layer of polyethylene resin having a thickness of 15 μ was formed on the corona discharge treated surface. Then, as an inner surface resin layer having heat sealability on the corona discharge treated surface after corona discharge treatment on the other surface of the cardboard,
A polyethylene resin extrusion coating layer having a thickness of 35 μm was formed to obtain a laminated sheet for comparison.

"Molding Paper Containers for Chilled Tea or Coffee" The above laminated sheets ~ 300 mm x
A thickness of 15 μm in each laminated sheet is obtained by punching and forming a blank plate for a 300 mm paper container and superposing the side portions of the blank plate by heat welding.
A rectangular tubular body having a bottom portion was obtained by molding a rectangular tubular body having the polyethylene resin extrusion coating layer as the outer peripheral surface layer and sealing the bottom portion according to a conventional method.

"Chilled tea or coffee flavor test" For each square cylinder having the above-mentioned bottom, 25
gebelle top type paper container (1000 cc of hot water at 90 ° C. leached for 2 minutes with 1000 cc of tea for beverages is hot-filled, and the top is formed by heat and pressure, and the top of the container is a roof type ( Width 7.0 cm, depth 7.
0 cm, height 24 cm).

For each square cylinder having the bottom, 40 g of coffee powder was added to hot water of 1000 cc at 90 ° C.
1000c of beverage coffee brewed over 2 minutes
c is hot-filled, and the top is formed by hot pressing,
A Gobel-top type paper container having a roof-shaped container top (width 7.0 cm, depth 7.0 cm, height 24 cm) was obtained.

After the paper containers containing the tea and coffee for beverages obtained by the above steps were left in an atmosphere of 10 ° C. for 2 weeks, a sensory test of the flavor of the tea and coffee in each paper container was conducted. Carried out. Test results [Table 1]
Shown in.

[0038]

[Table 1]

[0039]

EFFECTS OF THE INVENTION In the chilled-circulated paper containers for tea or coffee according to the first to third inventions, the inner peripheral surface layer of the laminated sheet constituting the paper container has a glass transition temperature of 40 ° C.
It is formed of the above-mentioned amorphous to low crystalline modified polyethylene terephthalate resin layer.

That is, in the chilled paper container for tea or coffee according to the present invention, the modified polyethylene terephthalate resin in which the layer in contact with the inner filler in the paper container has a glass transition temperature of 40 ° C. or higher. Since it does not absorb the flavor components in the filling material into the laminated sheet, it retains the quality of the tea or coffee for beverages contained in the paper container. Has an extremely excellent effect.

Further, in the above-mentioned paper container of the present invention, the sealing portion of the paper container has a heat-sealing property which is possessed by an amorphous to low crystalline modified polyethylene terephthalate resin having a crystallinity of 10% or less. Since it is formed by utilizing, the heat-sealed portion having good adhesive strength is formed.

Further, in the paper container of the second to third inventions, the seal portion of the paper container is formed with the heat seal portion which exerts an excellent action in terms of adhesive strength and impact resistance.

Claims (3)

[Claims] 1. A laminated sheet comprising a base material for a packaging material and an inner surface resin layer having heat sealability laminated on the base material for a packaging material, and the inner surface resin layer in the laminated sheet is a container. In a chilled paper container for tea or coffee that is box-formed so as to form an inner peripheral surface layer, the heat-sealable inner surface resin layer is amorphous with a glass transition temperature of 40 ° C. or higher. A paper container for chilled-distributed tea or coffee, which is formed of a modified polyethylene terephthalate resin having a low crystallinity. 2. A laminated sheet comprising a base material for a packaging material and an inner surface resin layer having heat sealability laminated on the base material for the packaging material, and the inner surface resin layer in the laminated sheet is a container. In a chilled paper container for tea or coffee that is box-formed so as to form an inner peripheral surface layer, the heat-sealable inner surface resin layer is amorphous with a glass transition temperature of 40 ° C. or higher. ~ A first resin layer made of a modified low-crystalline polyethylene terephthalate resin;
It is formed of a laminated resin layer of a second resin layer made of an adhesive polyolefin resin and a third resin layer made of a polyolefin resin, and the first resin layer in the laminated resin layer forms an outer layer. A paper container for chilled-circulated tea or coffee, which is laminated on a base material for packaging material. 3. A laminated sheet comprising a packaging material base material and a heat sealable inner surface resin layer laminated on the packaging material base material, wherein the inner surface resin layer in the laminated sheet is a container. In a chilled paper container for tea or coffee that is box-formed so as to form an inner peripheral surface layer, the heat-sealable inner surface resin layer is amorphous with a glass transition temperature of 40 ° C. or higher. ~ A first resin layer made of a modified low-crystalline polyethylene terephthalate resin;
The laminated resin layer is composed of a second resin layer made of a polyolefin resin film having a carboxyl group and having a corona discharge treatment on the laminated surface with the first resin layer, and the laminated resin A chilled-circulated paper container for tea or coffee, wherein the first resin layer in the layer is laminated on a base material for a packaging material so as to form an outer layer.