JPH0681729U - Base paper for heat-insulating containers - Google Patents

Abstract

(57) [Summary] [Purpose] The present invention relates to a base paper for producing a container that can hold a hot beverage, a low temperature ice cream, or the like by hand and has a heat insulating effect for a long time. [Structure] A container inner surface forming layer, a container inner surface forming layer, and a heat insulating layer in between, and the heat insulating layer is a porous coating layer containing hollow porous fine particles, and porous fine particles. Paper layer containing paper, crepe paper layer laminated with an adhesive, cloth made of natural fiber, cloth made of synthetic fiber, non-woven fabric or mesh, and at least the inner surface of the container A base paper for a heat-insulating container, which is characterized by having a water resistant layer.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a base paper used for a container such as a paper cup used for containing hot beverages such as hot coffee, hot tea and hot green tea, or a paper cup used for containing ice cream, cold and soft drinks, etc. .

[0002]

[Prior art]

 Most conventional paper cups are made of water-impervious material that is extremely thin, and no light container with both heat insulation and water resistance is available on the market.

[0003]

[Problems to be solved by the device]

 The above-mentioned conventional technology is too hot to pour extremely hot coffee or tea, and it is difficult to hold it in hand. Since the temperature rises, improvement has been desired, for example, as an ice cream container.

The present invention solves such a problem, and is hot coffee, hot tea, or the like that does not feel the heat even if it is extremely hot and put in a container and held by hand, and The purpose of this paper is to make a base paper suitable for making a container that is not easily affected by the high temperature of the outside air even if it is cold.

[0005]

[Means for Solving the Problems]

 The present invention has been made to solve the above problems, and the outline thereof is as follows. It has a laminated structure consisting of a layer for forming the inner surface of the container, a layer for forming the outer surface of the container, and a heat insulating layer in between, and the heat insulating layer is (a) a porous coating layer containing hollow fine particles, or (B) Porous fine particle-containing paper layer or (c) a crepe paper layer laminated with an adhesive, and at least the layer for forming the inner surface of the container is formed. It is a base paper for heat-insulating containers that is water resistant.

In the above, each constituent material will be described. In the porous coating layer containing hollow fine particles constituting the heat insulating layer, the hollow fine particles may be either an inorganic substance or an organic substance. The method of applying a coating solution containing hollow fine particles formed in the form of a fine particle on a paper support, a volatile substance such as an organic solvent is contained in microcapsules made of a thermoplastic substance, and this is mixed with the coating liquid, Appropriate means such as a method of forming hollows in the thermoplastic material by applying heat to the paper support, heating, drying and expanding the paper support is adopted. In the latter method, since the surface is made smooth, there is no problem even if pressure is applied after forming the porous coating layer as long as the hollow state is supported.

The encapsulated material of the microcapsules is preferably a low boiling point hydrocarbon solvent, and the shell wall is preferably a vinylidene chloride copolymer or an acrylic resin. Usually, unexpanded particles having a particle size of 10 to 20 μm are dispersed in a binder resin to prepare a coating solution, which is applied to a paper support and then heated at a temperature of 100 to 140 ° C. for 30 to 90 seconds. The particles undergo volume expansion of several times to several tens of times to form hollow fine particles in the binder resin.

Examples of the hollow fine particles include the following. (1) Hollow fine particles in which thermally expandable fine particles are expanded Hollow particles having a thermoplastic material as a capsule wall, and a material containing an expander which volatilizes by heat inside the particles Thermoplastic material: vinylidene chloride-acrylonitrile Copolymers and the like. Materials that expand by heat: n-butane, isobutane, neopentane, petroleum ether, etc. Thermal conductivity = 0.02 to 0.06 W / mK This product example: Matsumoto Yushi-Seiyaku Co., Ltd .: Matsumoto Microsphere, Dainichiseika KK: Expamcel, New Dieform W (2) Glass hollow fine particles Borosilicate glass microspheres, thermal conductivity = 0.1 W / mK This product example: Graberbell / Microcel M (3) Aluminosilicate hollow microparticles Low foam injection molding standard Premix for injection molding Thermal conductivity = 0.07 W / m · K This product example: Nippon Fillite Co., Ltd .: Fillite The hollow microsphere particles having the above shell have a particle size of about 5 μm to 200 μm, but are porous. In order to use it for the quality coating layer, it is preferable to select and use a relatively small one having a size of 50 μm or less.

A paper layer containing porous fine particles on at least one side of a paper support is formed by combining paper, and the porous fine particles used here are, for example, "Radio", which is a trade name marketed by Showa Chemical Industry Co., Ltd. Examples include minerals with a multicellular structure obtained by rapid heat treatment of perlite (pearlite) such as “light” and “topco”.

In the case of making the above-mentioned paper making, it can be produced by using a cylinder paper machine, internally adding the porous fine particles to a wood pulp raw material, and making a paper making with a paper support raw material. .

Next, the crepe paper used for forming the heat insulating layer in the present invention means a paper with wrinkle-like wrinkles, and commonly called wrinkle paper is called wrinkle paper. There are two manufacturing methods: wrinkling on a paper machine and wrinkling after paper making. In both cases, a paper roll containing appropriate water is brought into close contact and peeled off with a doctor (scraping plate). Give wrinkles parallel to the roll axis and dry with as little tension as possible. Examples of the cloth made of natural fibers, the cloth made of synthetic fibers, the non-woven fabric or the mesh include non-woven fabric made of synthetic fibers such as cotton gauze, polyethylene, polypropylene, nylon and polyester, or a mesh formed by meshing those threads in a mesh shape. The example of the product is as follows. Non-woven fabric: Mitsui Petrochemical Co., Ltd. Product name Syntex MY (polyester type) Unitika Co., Ltd. product name Max (polyester type), Product name Elves (polyethylene type) Mesh: Otoyo Chemical Industry Co., Ltd. product name Tylene (polyethylene type)

Further, the waterproof treatment of the inner surface forming layer or the like can be achieved by laminating a plastic film, an aluminum foil or a composite foil thereof, or by coating or impregnating waxes.

The present invention will be described below with reference to the drawings. 1 is a layer for forming an inner surface, 2 is a layer for forming an outer surface, and 3 is a heat insulating layer in between. The layer 1 for forming the inner surface and the layer 2 for forming the outer surface use a wood pulp paper and a synthetic pulp mixed paper having a thickness of 20 to 200 μm as a base, and particularly the layer 2 for forming the outer surface improves printability. In order to achieve this, a pigment such as calcium carbonate, clay or titanium white may be internally added to the paper support, or a paint containing these pigments may be applied to the paper support to form it. Good.

When a porous coating layer containing hollow fine particles is used as a heat insulating layer in the present invention, the dispersed state of the hollow fine particles may be scattered in the layer or may be a closest packed state. May be. Further, by forming the surface of the porous coating layer into a corrugated shape, a good heat insulating effect can be obtained even if the coating thickness is thin. As a method of imparting the corrugated shape, for example, the coating liquid for the porous coating layer may be coated on the support with a wire doctor wound by thinning or a blade having a corrugated shape.

[0015]

【Example】

Examples will be described below. Example 1 A microcapsule having a particle diameter of 10 to 20 μm (Matsumoto Microsphere F-30 manufactured by Matsumoto Yushi-Seiyaku Co., Ltd.) in which a low boiling hydrocarbon solvent is included in a shell wall made of a vinylidene chloride copolymer 20 parts by weight of the expanded particles were mixed with 100 parts by weight of an aqueous acrylic resin having a solid content of 50% to prepare a coating liquid for a heat insulating layer. On the other hand, pulp consisting of 70 parts by weight of NBK and 30 parts by weight of LBKP was beaten at 55 ° SR to form a pulp raw material. Based on the pulp raw material, 2% of styrene / acrylic acid ester sizing agent and polyamide epichlorohydrin resin were used. 1.6% of a wet paper strength enhancer was added to prepare a papermaking raw material, and a Fourdrinier paper machine was used to prepare a base paper A as a layer for forming an inner surface of a container having a basis weight of 90 g / m ² .

On one surface of the obtained base paper A, a heat insulating coating liquid was applied so as to have a coating thickness of 750 μm after drying, once dried at 60 ° C. for 1 minute and a half, and then heat treated at 140 ° C. for 1 minute, The unexpanded particles in the heat insulating layer were foamed to form hollow fine particles. Then, an aqueous emulsion adhesive composed of an acrylic copolymer resin (Yodozol GD901 manufactured by Kanebo NSC Co., Ltd.) was applied on the heat insulating layer, and the same formulation as the above-mentioned base paper A was used to form the outer surface of the container. The base paper B as a layer was laminated and dried. Further, the base paper A was laminated with polyethylene for water resistance treatment to impart water resistance, and the base paper of the present invention was produced. Using this base paper, a paper cup was molded and processed, and after boiling water was added for 1 minute, the temperature of the outer surface of the cup was measured and found to be 70 ° C, which was found to be acceptable for holding in the hand.

Example 2 A pulp comprising 70 parts by weight of NBKP and 30 parts by weight of LBKP was beaten to 55 ° SR to form a pulp raw material, and 2% of a styrene acrylic acid ester-based sizing agent was added to the pulp raw material, and polyamide epichlorohydrin resin. A wet strength agent consisting of 1. 6% was added to prepare the papermaking raw materials (A) and (B), while 50 parts by weight of porous layer perlite (Showa Chemical Industry Co., Ltd. trade name: TOPCO) was added to the papermaking raw material (A). A papermaking raw material (C) was prepared.

Next, the papermaking raw materials (A) and (B) (C) are made into paper by a cylinder paper machine so that the layer made of the papermaking raw material (C) becomes an intermediate heat-insulating layer, subjected to water resistance treatment, and then weighed. A base paper of the present invention having a weight of 84 g / m ² and a thickness of 224 μm was prepared. When evaluated in the same manner as in Example 1, favorable results were obtained.

Example 3 Pulp consisting of 70 parts by weight of NBK and 30 parts by weight of LBKP was beaten at 55 ° SR to form a pulp raw material, and 2% of a styrene acrylate ester size agent was added to the pulp raw material and a polyamide epichlorohydrin resin. A wet strength agent consisting of 1. 6% was added to prepare a papermaking raw material, and base papers (A) and (B) having a basis weight of 90 g / m ² were prepared using a Fourdrinier paper machine. Next, using the aqueous emulsion adhesive used in Example 1, first, a crepe paper having a material thickness of 150 μm before crepe treatment and a crepe paper thickness of 600 μm after crepe treatment was applied to one surface of the base paper (A). I matched it. On the other hand, the same adhesive was used for the base paper B, and the base paper (B) was attached to the surface of the crepe paper to prepare the base paper of the present invention. When evaluated in the same manner as in Example 1, favorable results were obtained.

Example 4 Using the adhesive of the base paper (A) and the aqueous emulsion used in Example 1, first, on one side of the base paper (A), a polyester-based nonwoven fabric having a thickness of 600 μm (manufactured by Mitsui Petrochemical Industry Co., Ltd. Product name Syntex PK-120) was pasted together. Next, using the same adhesive as the base paper (B) as a layer for forming the outer surface of the container, which has the same formulation as the base paper (A), the base paper (B) is attached to the surface of the non-woven fabric. The base paper of this invention was prepared. The surface of the base paper (A) was laminated with polyethylene to impart water resistance. When evaluated in the same manner as in Example 1, favorable results were obtained.

Example 5 Instead of the polyester-based nonwoven fabric of Example 4, a polyethylene-based mesh having a thickness of 1 mm (trade name: Tylene windproof net manufactured by Otoyo Kagaku Kogyo Co., Ltd.) was laminated. Others were the same as in Example 4 to prepare a base paper of the present invention. When evaluated in the same manner as in Example 1, favorable results were obtained.

[0022]

[Effect of device]

 According to the present invention, although the structure is extremely simple, the function of the heat insulating layer at the center end is extremely excellent, the water resistance of the drawing is not present, and it is possible to create a product with good printability on the outer surface. It is lightweight and can be easily held by hand when hot drinks are added, and it does not lose the cooling effect even when ice cream is added, so there is no need to prepare a large amount of dry ice.

[Submission date] May 15, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0005

[Correction method] Change

[Correction content]

[0005]

[Means for Solving the Problems]

The present invention has been made to solve the above problems, and the outline thereof is as follows. It has a laminated structure consisting of a layer for forming the inner surface of the container, a layer for forming the outer surface of the container, and a heat insulating layer in between, and the heat insulating layer is (a) a porous coating layer containing hollow fine particles, or (b) making paper combined layer or a paper layer containing porous fine particles (c) crepe paper layer was bonded via an adhesive, cloth made from natural fibers, fabrics made of synthetic fibers, either nonwoven or mesh Interview And a layer for forming the inner surface of the container, which is water-resistant, at least.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction content]

[0011] The crepe paper used in the formation of the insulating layer and then in the present invention refers to a paper with a crepe-like wrinkles, are commonly referred to as wrinkled paper whether crepe paper. There are two manufacturing methods: wrinkling on a paper machine and wrinkling after paper making. In both cases, a paper roll containing appropriate water is brought into close contact and peeled off with a doctor (scraping plate). Give wrinkles parallel to the roll axis and dry with as little tension as possible. Fabric consisting of natural fibers, fabrics made of synthetic fibers, as nonwoven fabric or mesh, include wood cotton gauze, polyethylene, polypropylene, nylon, knitted mesh woven or their yarn by synthesis textiles such as polyester in a mesh-like The product examples are as follows. Nonwoven fabric: Mitsui Petrochemical Co., Ltd. Product name Syntex MY (polyester type) Unitika Co., Ltd. product name Max (polyester type), Product name Elves (polyethylene type) Mesh: Otoyo Chemical Industry Co., Ltd. product name Tylene (polyethylene type)

[Brief description of drawings]

FIG. 1 is an enlarged sectional view showing the structure of a base paper of the present invention.

[Explanation of symbols]

 1 inner layer 2 outer layer 3 heat insulation layer

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Reference number within the agency FI technical display location D21H 27/30 17/67 (72) Inventor Kazuma Mogi, No. 3, Soba Town, Shizuoka City, Shizuoka Prefecture No. 1 Inside the Sogawa Mill for Tomoegawa Paper Mill

Claims (1)

[Scope of utility model registration request] 1. A laminated structure comprising a layer for forming the inner surface of a container, a layer for forming the outer surface of the container, and a heat insulating layer in the middle, the heat insulating layer being (a) a porous layer containing hollow fine particles. Quality coating layer,
Alternatively, (b) a paper-making layer of a paper layer containing porous fine particles, or (c) a crepe paper layer laminated with an adhesive, a cloth made of natural fibers, a cloth made of synthetic fibers,
A base paper for a heat-insulating container, which is composed of either a non-woven fabric or a mesh, and at least the layer for forming the inner surface of the container is water-resistant.