WO2021261032A1

WO2021261032A1 - Paper container for oil spice-containing instant food

Info

Publication number: WO2021261032A1
Application number: PCT/JP2021/010860
Authority: WO
Inventors: 博紺屋本; 有理大石; 知恵大村; 徳之椎名; 友央上野
Original assignee: 日本製紙株式会社; 日清食品ホールディングス株式会社
Priority date: 2020-06-23
Filing date: 2021-03-17
Publication date: 2021-12-30
Also published as: JP2022002978A

Abstract

The present invention addresses the problem of providing a paper container for oil spice-containing instant food, the paper container being capable of preventing the oil spice from oozing out of the container.　To solve the problme, the present invention provides a paper container for oil spice-containing instant food, the container comprising a body member and a bottom plate member, wherein: the body member includes, from the outer surface side, a paper substrate and a liquid impermeable layer, or a paper barrier substrate and a liquid impermeable layer; the bottom plate member includes, from the outer surface side, a paper barrier substrate and a liquid impermeable layer; the bottom plate member, or the paper barrier substrate included in the body member and the bottom plate member has, on a paper substrate, a filler layer containing an inorganic pigment and a binder resin and a gas barrier layer containing an inorganic pigment and a polyvinyl alcohol resin in this order; and the liquid impermeable layer is arranged on the gas barrier layer.

Description

Instant food paper container containing oil and spices

The present invention relates to a paper container used for instant foods containing oil and spices.

Insulating containers are generally used for instant noodle containers containing cups. As a heat insulating container used for such an application, one made of expanded polystyrene (EPS) is known. A heat insulating container made of EPS is manufactured by casting a raw material in which a foaming agent is added to polystyrene into a mold, and applying heat and pressure to the raw material to foam and mold the raw material. The EPS heat-insulating container thus obtained is extremely excellent in heat-insulating properties because the entire container is foamed. However, from the viewpoint of saving petroleum resources, it is required to review its use.

Paper containers using paper derived from biomass have begun to spread in place of expanded polystyrene derived from petroleum resources. In a general paper container, the body member and the bottom plate member have a polyolefin-based heat seal layer, and the body member and the bottom plate member are fixed by the heat seal. Further, as an instant food paper container, Patent Document 1 describes that in a paper container composed of a container body member and a bottom plate member, a low melting point thermoplastic synthetic resin film is laminated on the outer wall surface of the container body member and heated. Discloses a heat-insulating paper container having a foamed heat-insulating layer in which a film is foamed unevenly by utilizing the vapor pressure of water contained in paper as a base material. Further, in Patent Document 2, two layers are provided on one wall surface of the body member, from the surface side of the paper, composed of a foamed inner layer of a thermoplastic resin having a low melting point and a non-foamed outer layer of a thermoplastic resin having a melting point higher than this. A paper container coated with a structural heat insulating film is disclosed.

Here, in order to improve the flavor of instant foods or to add spices according to the tastes of food and drink, a seasoning in which edible oils and fats and spices are mixed (hereinafter, also referred to as "oil spices"). Say.) May be used. The edible oils and fats are easily compatible with polyolefin resins such as polyethylene and polypropylene. Therefore, when instant foods containing oil spices are stored in a heat-sealed paper container, the oil spices permeate the polyolefin resin, causing coloring and fragrance leakage that can be confirmed even from the outside of the paper container (hereinafter referred to as "bleeding out"). Also called.) May occur.
In order to prevent this oozing out, it is used to use a body member and a bottom plate member in which a PET film or the like, which is difficult for oils and fats to blend in, is laminated on the inner surface side of the base paper. The use of PET film or the like has a problem of impairing the effect of reducing the environmental load.

Japanese Unexamined Patent Publication No. 57-110439 Japanese Unexamined Patent Publication No. 05-0422929

An object of the present invention is to provide an instant food paper container containing oil spices, which can prevent oil spices from seeping out.

The means for solving the problem of the present invention is as follows.
1. 1. An instant food paper container containing oil and spices consisting of a body member and a bottom plate member.
The body member includes a paper base material and a liquid impermeable layer from the outer surface side.
The bottom plate member includes a paper barrier base material and a liquid impermeable layer from the outer surface side.
The paper barrier base material included in the bottom plate member has a sealing layer containing an inorganic pigment and a binder resin and a gas barrier layer containing an inorganic pigment and a polyvinyl alcohol-based resin on the paper base material in this order. ,
An oil-spicy-containing instant food paper container having the liquid impermeable layer on the gas barrier layer.
2. 2. An instant food paper container containing oil and spices consisting of a body member and a bottom plate member.
The body member includes a paper barrier base material and a liquid impermeable layer from the outer surface side.
The bottom plate member includes a paper barrier base material and a liquid impermeable layer from the outer surface side.
The paper barrier base material included in the body member and the bottom plate member has a sealing layer containing an inorganic pigment and a binder resin and a gas barrier layer containing an inorganic pigment and a polyvinyl alcohol-based resin on the paper base material. Have in order,
An oil-spicy-containing instant food paper container having the liquid impermeable layer on the gas barrier layer.
3. 3. 1. The gas barrier layer further contains at least one selected from polyethyleneimine, an organic titanium-based compound, and a polybutadiene-based compound. Or 2. Instant food paper container containing oil and spices as described in.

In the container made of instant food paper containing oil and spices of the present invention, the bottom plate member, or the body member and the bottom plate member have excellent oil resistance, and it is possible to prevent oil from seeping out from the winding portion.

The present invention relates to a paper container used for instant foods containing oil and spices. -Oil spices The oil spices in the present invention refer to seasonings in which edible oils and fats and spices are mixed, and may contain emulsifiers and the like, if necessary.
Edible oils and fats refer to edible oils and fats, specifically palm oil, palm oil, soybean oil, rapeseed oil (canola oil), rice oil, corn oil, olive oil, white squeezed oil, sunflower oil, and flaxseed oil. , Peanut oil, safflower oil (red flower oil), vegetable oil such as sesame oil, animal oil such as pork fat, beef oil, chicken oil, processed oil such as shortening and the like. Further, these may be mixed and used.
The spice contains not only the spice itself such as curry powder, turmeric, chili pepper, and pepper, but also a pigment isolated from the spice such as a carotenoid pigment and a mailard pigment, and an aroma component. In particular, oil-soluble carotenoid pigments (paprika, marigold, capsicum pigment, etc.) easily exude and significantly deteriorate the appearance of the container. Therefore, there is a great merit in using the oil-spices-containing instant food paper container of the present invention.

When mixing edible oils and fats with spices, it is preferable to add an emulsifier. By blending an emulsifier, the dispersibility and miscibility of spices in edible oils and fats are improved, and it is possible to obtain a state without color unevenness.
Examples of the emulsifier include propylene glycol fatty acid ester, glycerin fatty acid ester, sorbitan fatty acid ester, stearoyl lactate calcium, enzyme-treated soybean saponin, enzyme-treated lecithin, enzymatically decomposed lecithin, vegetable sterol, plant lecithin and the like. It is preferable to use it.

The oil and spice may be an edible oil or fat in which the spice is dissolved, or may be a spice and the edible oil or fat that come into contact with each other afterwards. Edible oils and fats in which spices are dissolved are used in instant foods in the form of powdered soups, liquid soups and the like. Further, chili oil, mar oil, green onion oil, Japanese pepper oil, etc. can be added later according to the taste of the food and drink. Examples of the subsequent contact between the spice and the edible oil / fat include a noodle mass (fried noodle) containing the edible oil / fat sprinkled with a powder seasoning containing the spice. Even when the spice and the edible oil / fat come into contact with each other afterwards, the spice dissolves in the edible oil / fat after being left to stand for a long time, so that the spice is classified as an oil / spice.

-Instant food paper container containing oil and spices The first container made of instant food paper containing oil and spices of the present invention is
An instant food paper container containing oil and spices consisting of a body member and a bottom plate member.
The body member includes a paper base material and a liquid impermeable layer from the outer surface side.
The bottom plate member includes a paper barrier base material and a liquid impermeable layer from the outer surface side.
The paper barrier base material included in the bottom plate member has a sealing layer containing an inorganic pigment and a binder resin and a gas barrier layer containing an inorganic pigment and a polyvinyl alcohol-based resin on the paper base material in this order. ,
It is characterized by having the liquid impermeable layer on the gas barrier layer.

The second oil and spice instant food paper container of the present invention is
An instant food paper container containing oil and spices consisting of a body member and a bottom plate member.
The body member includes a paper barrier base material and a liquid impermeable layer from the outer surface side.
The bottom plate member includes a paper barrier base material and a liquid impermeable layer from the outer surface side.
The paper barrier base material included in the body member and the bottom plate member has a sealing layer containing an inorganic pigment and a binder resin and a gas barrier layer containing an inorganic pigment and a polyvinyl alcohol-based resin on the paper base material. Have in order,
It is characterized by having the liquid impermeable layer on the gas barrier layer.

Hereinafter, the first and second oil and spices instant food paper containers are also referred to as the first paper container and the second paper container, respectively, and the first paper container and the second paper container are collectively referred to. Also referred to as a paper container of the present invention.

-Paper base material The paper base material is obtained by papermaking a paper material containing pulp, a filler, various auxiliaries and the like.
Examples of the pulp include bleached kraft pulp of coniferous tree (NBKP), unbleached kraft pulp of coniferous tree (NUKP), bleached kraft pulp of broadleaf tree (LBKP), unbleached kraft pulp of broadleaf tree (LUKP), sulfide pulp (SP) and the like. Wood chemical pulp, ground pulp (GP), refiner ground pulp (RGP), stone ground pulp (SGP), chemi-grand pulp (CGP), semi-chemical pulp (SCP), thermomechanical pulp (TMP), chemi-thermomechanical Known pulp such as mechanical pulp of wood such as pulp (CTMP) and non-wood pulp obtained from Kenaf, Bagus, bamboo, hemp, straw and the like can be appropriately blended and used. Among these, chemical pulps such as LBKP and NBKP, which are less likely to be mixed with foreign substances, are preferable. Specifically, the blending ratio of the chemical pulp with respect to the total amount of pulp is preferably 80% or more, and particularly preferably 100%.

Fillers include talc, kaolin, calcined kaolin, clay, heavy calcium carbonate, light calcium carbonate, white carbon, zeolite, magnesium carbonate, barium carbonate, titanium dioxide, zinc oxide, silicon oxide, amorphous silica, aluminum hydroxide. , Inorganic fillers such as calcium hydroxide, magnesium hydroxide, zinc hydroxide, barium sulfate, calcium sulfate, and organic fillers such as urea-formalin resin, polystyrene resin, phenolic resin, and fine hollow particles are used. be able to. The filler is not an essential material and may not be used.

Examples of various auxiliaries include rosin, alkyl keten dimer (AKD), alkenyl succinic acid anhydride (ASA) and other sizing agents, polyacrylamide-based polymers, polyvinyl alcohol-based polymers, cationized starch, various modified starches, urea and other agents. Dry paper strength enhancer such as formalin resin, melamine / formalin resin, wet paper strength enhancer, retention agent, drainage improver, coagulant, sulfuric acid band, bulking agent, dye, fluorescent whitening agent, pH adjuster, Examples thereof include a defoaming agent, an ultraviolet inhibitor, a fading inhibitor, a pitch control agent, a slime control agent, and the like, and they can be appropriately selected and used as necessary.

The method of manufacturing the paper base material (paper making) and the model of the paper machine are not particularly limited, and the long net paper machine, the circular net paper machine, the short net paper machine, the gap former type, and the hybrid former type (on-top) are not particularly limited. A known manufacturing (papermaking) method, such as a twin wire paper machine such as a former type), or a paper machine can be selected. The pH at the time of papermaking may be any of an acidic region (acidic papermaking), a pseudo-neutral region (pseudo-neutral papermaking), a neutral region (neutral papermaking), and an alkaline region (alkaline papermaking). Later, an alkaline agent may be applied to the surface of the paper layer. Further, the paper base material may be one layer or may be composed of two or more layers.

The basis weight of the paper substrate can be appropriately selected depending on the handleability and the like, but usually 180 g / m ² or more and 400 g / m ² or less is preferable, and 200 g / m ² or more and 350 g / m ² or less is usually preferable. More preferred.
As will be described in detail below, when the foamed heat insulating layer before foaming (hereinafter, also simply referred to as “non-foamed layer”) is foamed by water vapor generated from the moisture contained in the paper substrate to provide the foamed heat insulating layer. The amount of water contained in the paper substrate is important. When the foamed heat insulating layer is provided, the water content contained in the paper substrate is preferably 5 g / m ² or more, more preferably 10 g / m ² or more, and further preferably 15 g / m ² or more. Further, it is preferably 60 g / m ² or less, and more preferably 40 g / m ² or less.

The density of the paper substrate may be appropriately set as desired, and is not particularly limited, but is preferably ^{0.60 g / cm 3 or more.} If the density of ^{the paper substrate is less than 0.60 g / cm 3} , the paper strength required for the paper container may not be obtained.
The upper limit of the density of the paper base material is not particularly limited, but when the foam insulation layer is provided, if the density of the paper base material ^{exceeds 0.99 g / cm 3} , it becomes difficult for water vapor to pass through and the foamability tends to decrease. Be done. If the foaming uniformity is insufficient, a coating liquid having an affinity for paper, such as polyvinyl alcohol and starch, can be applied so that water vapor can be uniformly evaporated from the surface of the paper substrate.

-Paper barrier base material The paper barrier base material has a sealing layer and a gas barrier layer in this order on the paper base material.
-Paper base material As the paper base material, the above-mentioned ones can be used.

-Sealing layer The sealing layer prevents the gas barrier property from deteriorating by suppressing the sinking of the coating liquid for the gas barrier layer into the paper substrate when the gas barrier layer is provided. The sealing layer contains an inorganic pigment and a binder resin. The sealing layer may contain a sizing agent, a water resistant agent, a water repellent agent, a dye, a surfactant and the like, if necessary.

Examples of inorganic pigments include light calcium carbonate, heavy calcium carbonate, kaolin, calcined kaolin, engineered kaolin, clay, delaminated clay, talc, silica, colloidal silica, calcium sulfate, barium sulfate, titanium dioxide, zinc oxide, and the like. Examples thereof include zinc sulfide, zinc carbonate, satin white, aluminum silicate, calcium silicate, magnesium silicate, aluminum hydroxide, alumina, magnesium carbonate, magnesium hydroxide, kaolinite, antigolite, smectite, vermiculite, and mica. As the inorganic pigment, one or a mixture of two or more of these can be used.

As the binder resin, a type generally used in the field of coated paper or the like can be appropriately used. For example, fully saponified polyvinyl alcohol, partially saponified polyvinyl alcohol, ethylene copolymerized polyvinyl alcohol, acetoacetylated polyvinyl alcohol, carboxy-modified polyvinyl alcohol, amide-modified polyvinyl alcohol, sulfonic acid-modified polyvinyl alcohol, butyral-modified polyvinyl alcohol, olefin-modified polyvinyl. Polyvinyl alcohols such as alcohol, nitrile-modified polyvinyl alcohol, pyrrolidone-modified polyvinyl alcohol, silicone-modified polyvinyl alcohol, and other modified polyvinyl alcohols, (meth) acrylic acid, and monomer components that can be copolymerized with (meth) acrylic acid ( Acrylic resin (excluding olefins), hydroxyethyl cellulose, methyl cellulose, ethyl cellulose, carboxymethyl cellulose, cellulose derivatives such as acetyl cellulose, starches such as oxidized starch, etherified starch, esterified starch, styrene-maleic anhydride copolymer. , Styrene-butadiene copolymer, casein, arabiya rubber, polyvinyl chloride, polyvinyl acetate, polyacrylamide, polyacrylic acid ester, polyvinyl butyral, polyvinyl alcohol and their copolymers, polyamide resin, silicone resin, petroleum resin, Examples thereof include terpen resin, ketone resin, and kumaron resin. The binder can be used alone or in admixture of two or more.

-Gas barrier layer The gas barrier layer contains an inorganic pigment and a polyvinyl alcohol-based resin to impart gas barrier properties. As the inorganic pigment, an inorganic pigment that can be used for the above-mentioned sealing layer can be appropriately used. As the inorganic pigment, one or a mixture of two or more of these can be used.

Examples of the polyvinyl alcohol-based resin include fully saponified polyvinyl alcohol, partially saponified polyvinyl alcohol, ethylene copolymerized polyvinyl alcohol, acetoacetylated polyvinyl alcohol, carboxy-modified polyvinyl alcohol, amide-modified polyvinyl alcohol, sulfonic acid-modified polyvinyl alcohol, and butyral-modified polyvinyl. Polyvinyl alcohols such as alcohol, olefin-modified polyvinyl alcohol, nitrile-modified polyvinyl alcohol, pyrrolidone-modified polyvinyl alcohol, silicone-modified polyvinyl alcohol, and other modified polyvinyl alcohol can be used.

Further, the gas barrier layer may contain at least one selected from polyethyleneimine, an organic titanium-based compound, and a polybutadiene-based compound in order to improve the adhesion to the liquid impermeable layer described later. Examples of the organic titanium compound include titanium alkoxides such as titanium-i-propoxyoctylene glycolate and di-i-propoxybis (acetylacetonato) titanium, and specific examples thereof are manufactured by Matsumoto Fine Chemicals Co., Ltd. Examples include the "Organics" series. Further, as the polybutadiene compound, a liquid polybutadiene "NISSO-PB" series manufactured by Nippon Soda Co., Ltd. can be exemplified. Further, cellulose nanofibers may be contained to assist the barrier property.
These components (compounds) that improve the adhesion to the liquid impermeable layer may be contained in the coating liquid for forming the gas barrier layer, or after the gas barrier layer is formed, a known coating device or the like may be contained. Therefore, it can be coated on the gas barrier layer and contained.

The amount of the inorganic pigment blended is preferably in the range of 1 part by weight or more and 1000 parts by weight or less with respect to 100 parts by weight of the polyvinyl alcohol-based resin by dry weight. In the present invention, when the inorganic pigment is blended in the coating liquid for the gas barrier layer, it is preferable to add and mix the slurry of the inorganic pigment.
Further, in the present invention, in addition to the inorganic pigment and polyvinyl alcohol resin, the gas barrier layer is usually used with a dispersant, a thickener, a water retention agent, a defoaming agent, a water resistant agent, a dye, a fluorescent dye, a cross-linking agent and the like. Various auxiliaries can be used.

The paper barrier base material can be produced by sequentially applying and drying a coating liquid for forming a sealing layer and a gas barrier layer on the paper base material.
The coating method of the sealing layer and the gas barrier layer is not particularly limited, and coating can be performed by a known coating device and coating system. For example, examples of the coating device include a blade coater, a bar coater, an air knife coater, a curtain coater, a spray coater, a roll coater, a reverse roll coater, a size press coater, a gate roll coater, and the like. In addition, examples of the coating system include water-based coating using a solvent such as water, solvent-based coating using a solvent such as an organic solvent, and the like.
As a method for drying the sealing layer and the gas barrier layer, for example, a usual method such as a steam heater, a gas heater, an infrared heater, an electric heater, a hot air heater, a microwave, or a cylinder dryer is used.

The amount of coating of the sealing layer ^{is preferably 3 g / m 2} or more and 15 g / m ² or less in terms of dry weight. If the coating amount is ^{less than 3 g / m 2} , the sealing effect may be insufficient. On the other hand, if it is ^{more than 15 g / m 2} , the drying load at the time of coating becomes large, which is not preferable from the viewpoint of both operation and cost.
The coating amount of the gas barrier layer ^{is preferably 0.2 g / m 2} or more and 20 g / m ² or less in terms of dry weight. If the coating amount of the gas barrier layer ^{is less than 0.2 g / m 2} , it is difficult to form a uniform gas barrier layer, so that sufficient gas barrier properties may not be obtained. On the other hand, if it is ^{more than 20 g / m 2} , the drying load at the time of coating becomes large, which is not preferable from the viewpoint of both operation and cost.

In the first and second paper containers of the present invention, the basis weight, pulp composition, paper composition, etc. of the paper base material used for the body member and the bottom plate member may be the same or different. .. Further, in the second paper container of the present invention, the basis weight, pulp composition, paper material composition, etc. of the paper base material in the paper barrier base material used for the body member and the bottom plate member; the composition of the sealing layer, the coating, etc. Work amount, etc .; The composition of the gas barrier layer, the coating amount, etc. may be the same or different.

-Liquid impermeable layer The liquid impermeable layer is located on the inner surface side of the body member and bottom plate member, and is a liquid that is poured into a container after being molded into a container or a liquid on a paper barrier substrate. It prevents the penetration of.
The liquid impermeable layer can be used without particular limitation as long as it is a material that can achieve the purpose, and for example, a thermoplastic resin can be preferably used. The body member and bottom plate member having a liquid impermeable layer made of a thermoplastic resin can be molded into a paper container by heat sealing. As the thermoplastic resin, either a crystalline resin or a non-crystalline resin can be used.

Examples of crystalline thermoplastic resins include polyolefin resins such as polyethylene, polypropylene and polymethylpentene, polyester resins, polyamide resins, polyacetal resins, polyphenylene sulfide (PPS) resins and the like. Examples of the non-crystalline thermoplastic resin include polystyrene, polyvinyl chloride, ABS resin, acrylic resin, modified polyphenylene ether (PPE), polycarbonate, polyurethane, polyvinyl acetate, non-crystalline polyethylene terephthalate (PET) and the like. .. In addition, polylactic acid (PLA), cellulose acetate, polybutylene succinate (PBS), polybutylene succinate adipate (PBSA), polybutylene adipate / terephthalate (PBAT), polyhydroxyalkanoate (PHA), biomass polyethylene, biomass polyethylene. A plant-derived thermoplastic resin such as terephthalate may be used. As these thermoplastic resins, a single resin may be used in a single layer, or a plurality of resins may be used in a plurality of layers. Further, the same or different thermoplastic resins can be used in the liquid impermeable layer of the body member and the bottom plate member.

As the thermoplastic resin, polyethylene is preferable from the viewpoint of extruded laminating suitability and heat seal suitability, and low-density polyethylene or medium-density polyethylene having a high melting point is particularly preferable, but high-density polyethylene or a blend of high-density polyethylene and low-density polyethylene is preferable. Resin may be used. When polyethylene is used for the liquid impermeable layer, its melting point is preferably 105 ° C. or higher, more preferably 110 ° C. or higher.

-Foam heat insulating layer In the paper container of the present invention, a foam heat insulating layer can be provided on the outer surface side of the body member or the body member and the bottom plate member.
At least in a paper container provided with an effervescent heat insulating layer on the outer surface side of the body member, heat is not easily transferred to the outer surface even if hot water is poured into the container, so that it is easy to hold the paper container by hand and eat and drink.

The foamed heat insulating layer can be used without particular limitation as long as it is a material that can achieve the purpose, and for example, the thermoplastic resin mentioned in the liquid impermeable layer can be used. As the thermoplastic resin, either a crystalline resin or a non-crystalline resin can be used, and a plant-derived thermoplastic resin can also be used. When an unexpanded layer made of a thermoplastic resin is foamed to form a foamed heat insulating layer, it is preferably a single layer from the viewpoint of foamability.

The thermoplastic resin used for the foamed heat insulating layer of the present invention is preferably polyethylene because it is excellent in extruded laminate suitability and foamability, and is more preferably low density polyethylene because it is particularly excellent in foamability, and has a melting point of 90 ° C. or higher and 120 ° C. The following low density polyethylene is more preferable.

When the foamed heat insulating layer is provided in the paper container of the present invention, the melting point of the thermoplastic resin used for the foamed heat insulating layer is preferably lower than the melting point of the thermoplastic resin used for the liquid impermeable layer. By doing so, when the unfoamed layer is foamed by the steam generated by heating to form the foamed heat insulating layer, the unfoamed layer is easily foamed and the liquid impermeable layer is prevented from melting. Can be done. This difference in melting point is preferably 5 ° C. or higher, and more preferably 10 ° C. or higher. If the difference in melting point is less than 5 ° C., it may be difficult to control the temperature during foaming.

-Method for manufacturing foamed paper containers for instant foods In the first paper container of the present invention, a liquid impermeable layer is laminated on a paper base material to form a laminate for forming a body member, and a liquid is applied to a paper barrier base material. The impermeable layers are laminated to form a laminated body for forming a bottom plate member.
In the second paper container of the present invention, a liquid impermeable layer is laminated on a paper barrier base material to form a laminate for forming a body member and a laminate for forming a bottom plate member.

A liquid impermeable layer or a liquid impermeable layer and an unfoamed layer are laminated on a paper base material or a paper barrier base material by appropriately using various methods such as an extrusion laminating method, a wet laminating method, and a dry laminating method. This makes it possible to form a liquid impermeable layer and an unfoamed layer that will later become a foamed heat insulating layer. The extrusion laminating method is preferable because the adhesion between the paper base material or the paper barrier base material and the liquid impermeable layer or the non-foamed layer and the foamability of the non-foamed layer are good.
When the unfoamed layer is provided, it is preferable that the time interval between the liquid impermeable layer and the unfoamed layer is short. If the interval is too long, water may escape from the paper substrate and sufficient water vapor may not be generated. Further, either the liquid impermeable layer or the non-foamed layer may be provided first.

In the present invention, the operating conditions of the extrusion laminating method, that is, the melting temperature of the thermoplastic resin, the laminating speed, and the like may be appropriately set depending on the type and apparatus of the thermoplastic resin to be used, but the melting temperature is generally not limited. The temperature is about 200 to 350 ° C., and the stacking speed is about 50 to 200 m / min. Further, it is preferable to use a nip roll having a hardness of 70 degrees or more (JIS K-6253), and press and crimp the cooling roll and the nip roll facing the cooling roll at a linear pressure of 15 kgf / cm or more.

The thickness of the liquid impermeable layer is preferably 20 μm or more and 200 μm or less. If the thickness of the liquid impermeable layer is less than 20 μm, the strength of the heat seal may be insufficient. Even if the thickness of the liquid impermeable layer is thicker than 200 μm, the quality is hardly improved.
When the unfoamed layer is provided, the thickness thereof is not particularly limited as long as a foamed heat insulating layer of a desired quality can be obtained, but is preferably 30 μm or more and 80 μm or less. Within this range, sufficient heat insulating properties can be realized after foaming.

In the first paper container of the present invention, at least one thermoplastic resin layer selected from polyester resin or polyamide resin may be further provided between the paper base material of the body member and the liquid impermeable layer. can.
The polyester resin is not particularly limited, but is polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyethylene naphthalate (PEN), polybutylene succinate (PBS), polybutylene succinate adipate (PBSA), and polybutylene. One or two selected from adipate terephthalate (PBAT), polyallylate (PAR), polyhydroxyalkanoic acid (PHA) (polyester resin consisting of 3-hydroxyalkanoic acid), polylactic acid (PLA), polycarbonate (PC), etc. The above can be used. Among these, more preferable polyester-based resins include PET, PBS, PBSA, PBT, and PEN.

Examples of the polyamide resin include those obtained by polycondensing lactam having a 3-membered ring or more and ω-amino acid, and those obtained by polycondensation of diamine and dicarboxylic acid. Specific examples of the polyamide resin include 4 nylon, 6 nylon, 7 nylon, 11 nylon, 12 nylon, 46 nylon, 66 nylon, 69 nylon, MXD6 nylon and the like. These polyamide resins may be used alone or in combination of two or more. Among these, more preferable polyamide resins include 6 nylon and 66 nylon from the viewpoint of heat resistance and cost.

A liquid impermeable layer or a laminate obtained by laminating a liquid impermeable layer and an unfoamed layer on a paper base material or a paper barrier base material is punched out in a predetermined shape to obtain a body member and a bottom plate member. Then, the obtained body member and bottom plate member are subjected to a cup molding machine so that the liquid impermeable layer is on the inner surface side to form a cup shape, and if necessary, the unfoamed layer is foamed to form a foamed heat insulating layer. The paper container of the present invention can be obtained.

When processing with a cup molding machine, especially when the paper base material is a multi-layer product, if the internal bond strength of the paper base material is weak, the inside of the paper base material is inside the top curl part and the ruled line part of the carton blank during cup molding. May be destroyed and cause molding defects. The internal bond strength of the paper substrate is determined by J.I. TAPPI No. It can be measured in accordance with "Paper and Paperboard-Internal Bond Strength Test Method-Part 2: Internal Bond Tester Method" specified in 18-2: 2000, and this internal bond strength is 1.5 kgf. -If the thickness is cm or more, preferably 1.8 kgf · cm or more, more preferably 2.0 kgf · cm or more, the inside of the paper substrate is less likely to be broken during molding, and molding defects can be prevented.

The paper container of the present invention comprises the above-mentioned body member and bottom plate member. The paper container of the present invention may be a "composite container" in which a sleeve is provided on the outer surface of the body member and a heat insulating space is provided between the body member and the sleeve.

Hereinafter, the present invention will be described with reference to Examples, but the present invention is not limited to the following Examples. Unless otherwise specified, parts and% in the examples indicate parts by weight and% by weight, respectively.

(Preparation of coating liquid for sealing layer)
A coating liquid for a sealing layer was prepared by stirring and dispersing a formulation consisting of the following formulations. <Coating liquid for sealing layer>
Fine-grained kaolin (KaMin: Hydragloss) 60.0 parts Engineered Kaolin (Imeris: CapimDG) 20.0 parts Polyacrylic acid sodium 0.5 parts Heavy calcium carbonate (Fimatec: FMT-90) 20.0 parts Styrene-butadiene copolymer latex (Nippon Zeon: PNT8110) 20.0 parts Oxidized starch (Shikishima Starch: Mermaid M210) 2.0 parts Water 71.7 parts

(Preparation of coating liquid for gas barrier layer)
A coating liquid for a gas barrier layer was prepared by stirring and dispersing a formulation consisting of the following formulations.
<Coating liquid for gas barrier layer>
Engineered Kaolin (Imeris: Varisurf HX) 100.0 parts Sodium polyacrylate 0.2 parts Polyethylenimine 3.0 parts Polyvinyl alcohol (Kuraray, PVA117) 100.0 parts Water 1801.8 parts

"Example 1"
Medium-density polyethylene (manufactured by Sumitomo Chemical Co., Ltd .: L5721, melting point 128 ° C.) is extruded as a liquid impermeable layer on one side of a paper base material (paper container base paper with a basis weight of 309 g / m ^{2 and a three-layer product), and the temperature under the die is 330 by laminating.} Laminated at 40 μm in thickness at ° C. The adhesion between the paper substrate and the liquid impermeable layer was at the level of peeling. This configuration was used as a body member.

Apply the coating liquid for the sealing layer to one side of the paper substrate (paper container base paper with a basis weight of 210 g / m ² and a single-layer product) by the blade method so ^{that the coating amount is 6.0 g / m 2 by dry weight.} After working and drying, apply the coating liquid for the gas barrier layer on it ^{by the air knife method so that the coating amount is 3.0 g / m 2} by the dry weight, and dry it, and use the soft nip calendar to apply a linear pressure of 60 kN. The treatment was carried out under the condition of / m to obtain a paper barrier base material (basis weight 219 g / m ² ).
Medium-density polyethylene (manufactured by Sumitomo Chemical Co., Ltd .: L5721, melting point 128 ° C.) was extruded and laminated on the gas barrier layer of this paper barrier substrate at a temperature below the die of 330 ° C. to a thickness of 40 μm as a liquid impermeable layer. The adhesion between the gas barrier layer and the liquid impermeable layer was at the level of paper peeling. This configuration was used as a bottom plate member.
These were punched out in a predetermined shape, and cup molding was performed with a cup molding machine so that the liquid impermeable layer was on the inner surface side, and five paper containers were obtained. There were no problems with formability and appearance.

"Example 2"
A paper barrier base material (basis weight 309 g / m) is used in the same manner as in the method for manufacturing the bottom plate member of Example 1 above, except that a paper base material (paper container base paper having a basis weight of 300 g / m ^{2) is used.} ² ) was obtained, and a liquid impermeable layer (thickness 40 μm) was laminated on the gas barrier layer. The adhesion between the gas barrier layer and the liquid impermeable layer was at the level of paper peeling. This configuration was used as a body member.
The same bottom plate member as in Example 1 was used.
Next, punching was performed in a predetermined shape, and cup molding was performed with a cup molding machine so that the liquid impermeable layer was on the inner surface side to obtain five paper containers. There were no problems with formability and appearance.

"Comparative Example 1"
As the body member, the same one as in Example 1 was used.
Medium-density polyethylene (manufactured by Sumitomo Chemical Co., Ltd .: L5721, melting point 128 ° C.) is extruded as a liquid impermeable layer on one side of a paper base material (paper container base paper with a basis weight of 220 g / m ^{2 and a single-layer product), and the temperature under the die is 330 ° C.} Laminated with a thickness of 40 μm. The adhesion between the paper substrate and the liquid impermeable layer was at the level of peeling. This configuration was used as a bottom plate member.
Next, punching was performed in a predetermined shape, and cup molding was performed with a cup molding machine so that the liquid impermeable layer was on the inner surface side to obtain five paper containers. There were no problems with formability and appearance.

"Comparative Example 2"
As the body member, the same one as in Example 1 was used.
Using a tandem extruded laminator, a paper substrate (paper container base paper with a basis weight of 220 g / m ² , single-layer product) and a polyamide film (ONY (biaxially stretched nylon) film, manufactured by Unitica: emblem, thickness 15 μm) were combined. Medium-density polyethylene (manufactured by Sumitomo Chemical Co., Ltd .: L5721, melting point 128 ° C., thickness 15 μm) is laminated, and further, medium-density polyethylene (manufactured by Sumitomo Chemical Co., Ltd .: L5721, melting point 128 ° C.) is used as a liquid impermeable layer on an ONY film. Was laminated by extrusion laminating at a temperature of 330 ° C. under the die to a thickness of 35 μm. The adhesion was at the paper peeling level. This configuration was used as a bottom plate member.
Next, punching was performed in a predetermined shape, and cup molding was performed with a cup molding machine so that the liquid impermeable layer was on the inner surface side to obtain five paper containers. There were no problems with formability and appearance.

"Reference example 1"
Medium-density polyethylene (manufactured by Sumitomo Chemical Co., Ltd .: L5721, melting point 128 ° C.) is extruded as a liquid impermeable layer on one side of a paper substrate (paper container base paper with a basis weight of 320 g / m ^{2 and a three-layer product), and the temperature under the die is 330 by laminating.} Laminated at 40 μm in thickness at ° C. The adhesion between the paper substrate and the liquid impermeable layer was at the level of peeling. This configuration was used as a body member.
Using a tandem extruded laminator, a paper base material (paper container base paper with a basis weight of 220 g / m ² and a single layer product) and PET film (Toyobo Co., Ltd .: E5100, thickness 12 μm) were combined with medium-density polyethylene (Sumitomo Chemical Co., Ltd .: L5721, melting point 128 ° C, thickness 15 μm) is bonded together, and medium-density polyethylene (manufactured by Sumitomo Chemical Co., Ltd .: L5721, melting point 128 ° C) is extruded onto a PET film as a liquid impermeable layer, and the temperature under the die is 330 ° C. Laminated with a thickness of 35 μm. The adhesion was at the paper peeling level. This configuration was used as a bottom plate member.
Next, punching was performed in a predetermined shape and cup molding was performed with a cup molding machine to obtain five paper containers. There were no problems with formability and appearance.

The exudation of the obtained paper container was evaluated by the following method. The results are shown in Table 1.
0.5 g of paprika pigment (main component: capsaicin) was added to 10 g of refined palm oil to prepare a test oil and spice.
10.5 g of test oil and spice was placed in each of the five paper containers obtained above. At this time, the entire bottom surface of the inside of the paper container is immersed in the test oil and spice. Next, the lid was heat-sealed and allowed to stand in a thermostat set at 60 ° C. for 72 hours.
After standing still, the test oil and spices exuded from the winding part between the body member and the bottom plate member by observing the appearance at the exuded part, and those without the exuded part were at any place. The bottom plate was cut with a razor blade, and the cross section was observed with an optical microscope to confirm whether the paprika pigment in the test oil and spice reached the outermost layer.

・ Exudation from the winding part It was confirmed by observing the appearance that the exudation was seen from the winding part, and the evaluation was performed according to the following criteria.
OK: No bleeding is seen in all 5 paper containers.
NG: Exudation is seen in one or more of the five paper containers.

・ Penetration of the bottom plate member Through appearance observation and cross-sectional observation, it was confirmed whether the oil spice had reached the outermost layer of the bottom plate member, and evaluation was performed according to the following criteria.
OK: In all 5 paper containers, the oil spices have not reached the outermost layer.
NG: Oil spices reach the outermost layer in one or more of the five paper containers.

In the paper container obtained in Reference Example 1, the bottom plate member has a PET film between the paper base material and the liquid impermeable layer, which makes it difficult for oils and fats to blend in, and it is possible to prevent the oil and spices from seeping out. rice field.
The paper container in which the bottom plate member manufactured in Example 1 has a paper barrier base material and the paper container in which the body member and the bottom plate member manufactured in Example 2 have a paper barrier base material are the same as in Reference Example 1. In addition, it was possible to prevent the oil and spices from seeping out.
In the paper container manufactured in Comparative Example 1, neither the body member nor the bottom plate member is provided with the paper barrier base material, the oil spice seeps out from the winding portion, and the oil spice penetrates the bottom plate member. Was there.
In the paper container obtained in Comparative Example 2, the bottom plate member had an ONY film between the paper base material and the liquid impermeable layer, and the oil spice did not penetrate the bottom plate member, but the oil spice was used. It was not possible to prevent the exudation from the winding part.

Claims

An instant food paper container containing oil and spices consisting of a body member and a bottom plate member.
The body member includes a paper base material and a liquid impermeable layer from the outer surface side.
The bottom plate member includes a paper barrier base material and a liquid impermeable layer from the outer surface side.
The paper barrier base material included in the bottom plate member has a sealing layer containing an inorganic pigment and a binder resin and a gas barrier layer containing an inorganic pigment and a polyvinyl alcohol-based resin on the paper base material in this order. ,
An oil-spicy-containing instant food paper container having the liquid impermeable layer on the gas barrier layer.
An instant food paper container containing oil and spices consisting of a body member and a bottom plate member.
The body member includes a paper barrier base material and a liquid impermeable layer from the outer surface side.
The bottom plate member includes a paper barrier base material and a liquid impermeable layer from the outer surface side.
The paper barrier base material included in the body member and the bottom plate member has a sealing layer containing an inorganic pigment and a binder resin and a gas barrier layer containing an inorganic pigment and a polyvinyl alcohol-based resin on the paper base material. Have in order,
An oil-spicy-containing instant food paper container having the liquid impermeable layer on the gas barrier layer.
The oil-spicy-containing instant food paper container according to claim 1 or 2, wherein the gas barrier layer further contains at least one selected from polyethyleneimine, an organic titanium-based compound, and a polybutadiene-based compound. The