JP3923585B2 - Paper container with identification and manufacturing method thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a paper container such as a liquid paper container, a paper cup, and a paper tray provided with an identification display function, and a method for manufacturing the same, and particularly has an identification display function considering use by elderly people and visually impaired people. The present invention relates to a given paper container and a manufacturing method thereof.
[0002]
[Prior art]
Conventionally, in order to give an identification display function to a paper container, an identification display display is printed on the outer surface of the paper container, or an adhesive seal is attached as an identification display seal.
[0003]
[Problems to be solved by the invention]
However, conventional paper containers are often very similar in shape, and their display is visually confirmed, making it difficult for elderly people and visually impaired people to recognize this. In many cases, there was a risk that even a healthy person could not judge the contents and purchased and used it by mistake. In a paper container consisting of a single piece of paper, there is braille processing that performs press printing to form a convex part on the paper surface, but it is difficult to press printing with a material with a thermoplastic resin such as polyethylene resin laminated on the surface. There was a problem.
[0004]
Therefore, the present invention has been made in view of the above-described problems, and the object of the present invention is to provide a convex identification display on the surface of a paper container by foaming a surface thermoplastic resin layer. And providing a paper container with an identification display and a method of manufacturing the same for enabling consumers to judge the contents and for assisting the judgment, particularly for elderly people and visually impaired people.
[0005]
[Means for Solving the Problems]
The present invention has been studied to solve the above-described problems, and as a result, the water in the paper evaporates by heating from at least the outer surface side of the container, and the heat on the outer surface side of the container foams by the force of the vapor pressure. A paper container formed of a laminate comprising a plastic resin layer, a base material layer mainly composed of paper, and a thermoplastic resin layer on the inner surface side of the container , wherein the thermoplastic resin layer on the outer surface side of the container is partially The present invention has found and completed a paper container with an identification display characterized by having a convex identification display formed by foaming on the surface. At least from the outer surface side of the container, the moisture in the paper evaporates by heating and foams by the force of its vapor pressure, the thermoplastic resin layer on the outer surface side of the container, the base material layer mainly composed of paper, the inner surface side of the container A method of manufacturing a paper container formed of a laminate made of a thermoplastic resin layer and provided with a convex identification display on the surface is a part of the outer surface of the container of the thermoplastic resin layer on the outer surface side of the container. A foam-suppressing ink is applied in advance, and a non-foamed concave portion of the foam-suppressed ink coating portion is provided by heating and foaming, and a non-foamed portion of the foam-suppressing ink in the concave portion is foamed to form a convex portion. It is characterized in that it is a convex identification display formed .
[0006]
According to the present invention, in a paper container, a convex identification display is provided on the surface by foaming a thermoplastic resin layer on the surface, so that the contents can be judged for consumers, particularly elderly people and visually impaired people. This makes it possible to obtain a paper container with an identification display, which can be used to support judgment and is not expensive to manufacture.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the paper container with an identification display of the present invention will be described in detail with reference to the drawings.
[0008]
FIG. 1 is a perspective view showing an embodiment A of a paper container with identification display according to the present invention.
In a paper container having a thermoplastic resin layer that foams on the surface, a non-foamed recess C is provided in part in the formation of the foamed part B, and a part of the convex foam is formed in the recess C. The convex identification display part D is provided leaving the part.
[0009]
FIG. 2 is a diagram showing a configuration of a laminated body forming the paper container with identification display according to the present invention. The structure of the laminated body 1 that forms the paper container with an identification display includes paper as a base material layer 2 and an intermediate printing layer 3 and a transparent varnish layer 4 provided on the outer surface side. However, this transparent varnish layer 4 is not necessarily required. Moreover, the order which provides the intermediate | middle printing layer 3 and the transparent varnish layer 4 is possible in any case. Further, these layers are covered with a thermoplastic resin layer (outer surface) 5. There is a thermoplastic resin layer (inner surface) 6 on the inner surface side of the base material layer 2. In addition, a barrier layer such as a metal vapor deposition layer such as aluminum or an inorganic vapor deposition layer such as silica can be provided between the base material layer 2 and the thermoplastic resin layer (inner surface) 6 in order to improve barrier properties. .
[0010]
The basis weight of the paper used as the base material layer 2 is preferably in the range of 100 to 500 g / m ² in the production of a paper container. The moisture content of the paper is desirably 3 to 10%, more preferably 5 to 8%. When the moisture in the paper is evaporated and the surface thermoplastic resin layer is foamed by the force of the vapor pressure, if the water content is less than 3%, foaming is insufficient and the thickness of the foamed layer cannot be obtained. If the water content exceeds 10%, the foamed surface may be ruptured, which is not preferable.
[0011]
The intermediate printing layer 3 is applied on the paper surface of the base material layer 2 or the transparent varnish layer 4 as described above. This intermediate printing layer 3 may be printed partially with colored ink or may be printed with colored ink over the entire surface. For the printing position, the size of the printing area, the printing method, the ink used, etc., a conventionally known technique can be appropriately selected and used.
[0012]
The transparent varnish layer 4 is not necessarily required, but is provided on the paper surface of the base material layer 2 or on the intermediate printing layer 3. As a method for applying the transparent varnish, there are methods by printing and coating. Among these, a method by gravure printing is preferable. The composition of the transparent varnish is mainly composed of a synthetic resin containing extender pigments. As the synthetic resin, nitrified cotton, polyurethane resin, polyamide resin, polyvinyl chloride resin, acrylic resin, a resin in which two or more of these are mixed, and the like can be used. As extender pigments, titanium oxide, calcium carbonate, magnesium carbonate, a mixture of two or more of these, and the like can be used. The coating amount of the transparent varnish is preferably ² to 3 g / m ^{2 in} a dry state after coating.
[0013]
The thermoplastic resins forming the thermoplastic resin layer (outer surface) 5 and the thermoplastic resin layer (inner surface) 6 are low density polyethylene resin, linear low density polyethylene resin, medium density polyethylene resin, high density polyethylene resin, polypropylene resin, Ionomer, ethylene / vinyl acetate copolymer, ethylene / acrylic acid copolymer, ethylene / acrylic acid ester copolymer, ethylene / vinyl alcohol copolymer, polypropylene resin, polyester resin, polyvinyl chloride resin, polystyrene resin, etc. Can be used. The thermoplastic resin layer (outer surface) 5 and the thermoplastic resin layer (inner surface) 6 are laminated on the outer surface and the inner surface of the base material layer 2 on which printing and transparent varnish have been applied. Examples of the lamination method include an extrusion coating method in which a resin is melted and applied, or a lamination method in which a film is bonded. The thickness of the outer surface thermoplastic resin layer (outer surface) 5 to be the foam layer is preferably in the range of 10 to 100 μm. If it is less than 10 μm or exceeds 100 μm, foaming is difficult. On the other hand, the thickness of the inner surface thermoplastic resin layer (inner surface) 6 is not particularly limited. Further, in order to foam only the outer surface thermoplastic resin layer (outer surface) 5 without foaming the inner surface thermoplastic resin layer (inner surface) 6, as a method for preventing evaporation of water vapor from the inner surface, inner surface thermoplasticity As the resin, a thermoplastic resin having a softening point higher than that of the outer surface thermoplastic resin is used. For example, taking a polyethylene resin as an example, a low-density polyethylene resin having a low softening point can be used as the outer surface thermoplastic resin, and a high-density polyethylene resin having a high softening point can be used as the inner surface thermoplastic resin.
[0014]
Next, a description will be given of a method of providing the convex portion 7 serving as identification display on the paper container with identification display of the present invention.
[0015]
As shown in FIG. 2A, a foam suppression ink printing portion 7 is provided on the surface portion of the thermoplastic resin layer (outer surface) 5 that does not become the convex portion 8 in advance in the step before heating and foaming. By providing the foam suppression ink printing portion 7 on the surface of the thermoplastic resin layer (outer surface) 5, as shown in FIG. 2B, foaming of the thermoplastic resin layer (outer surface) 5 due to heating is prevented. In other words, the thermoplastic resin layer (outer surface) 5 below the foam-suppressed ink printed portion 7 to which the foam-suppressing ink has been applied is suppressed in fluidity even when heated, or water vapor is difficult to permeate. Foaming will be suppressed.
[0016]
Further, as another method, as shown in FIG. 3 from the back surface portion of the thermoplastic resin layer outer surface 5) that does not become the convex portion 8 in advance, that is, from above the intermediate printing layer 3, a method of applying the foam suppression ink printing portion 7. There is. By providing the foam suppression ink printing portion 7 on the back surface of the thermoplastic resin layer (outer surface) 5, foaming of the thermoplastic resin layer (outer surface) 5 due to heating is prevented. In other words, the thermoplastic resin layer (outer surface) 5 on the upper part of the foam-suppressed ink printed portion 7 to which the foam-suppressed ink is applied can be suppressed in fluidity even when heated, or water vapor is difficult to permeate. Foaming will be suppressed.
[0017]
As a material of the foam suppression ink, a resin generally used in packaging materials can be used. For example, nitrified cotton, polyurethane resin, polyamide resin, polyvinyl chloride resin, acrylic resin, and ketone resin can be used. The printing process can be performed mainly by gravure printing. The foam suppression ink may be colored or colorless.
[0018]
Moreover, as the shape of the convex identification display, characters, symbols, figures, etc. represented by Braille or convex lines can be used. In order to provide a convex identification display, a portion other than the convex portion is printed with the foam suppression ink to obtain a foam suppression ink print portion 7.
[0019]
As a heating method for foaming an unfoamed paper container with an identification display as shown in FIG. 2-a and obtaining a foamed paper container with an identification display as shown in FIG. 2-b, hot air, infrared rays, far infrared rays are used. There are methods using microwaves, high frequencies, etc., and there are a method of heating by standing or a method of heating while feeding by a conveyor. As heating conditions, the temperature is preferably in the range of 100 to 200 ° C., and the time is preferably in the range of 10 seconds to 5 minutes.
[0020]
Actually, when producing a paper container with an identification display, as a process, a laminate comprising a thermoplastic resin layer (outer surface) that is foamed by heating, a base material layer mainly composed of paper, and a thermoplastic resin layer (inner surface) After a blank is assembled into a paper container, and a method for providing a convex identification display by foaming other than the foam-suppressed ink printing portion 7 by heating in a blank of the paper container and heating in the blank state There is a method in which a portion other than the foam-suppressed ink printing portion 7 is foamed by heating in this state, and a convex identification display is provided.
[0021]
【Example】
Next, the present invention will be described more specifically with reference to examples.
[0022]
A cup base paper having a basis weight of 220 g / m ² and a water content of 7.5% was used as a base material layer, and a display and a pattern were printed on the surface by gravure printing. And in the recessed part C, vinylidene chloride resin is used as foaming suppression ink as a main component other than the convex identification display part D of the character "coffee" and the Braille convex identification display part E which displays "coffee". Printing was performed using the emulsion type ink. Subsequently, a low-density polyethylene resin layer having a density of 40 μm of resin having a density of 0.917 is formed on the front surface, and a high-density polyethylene resin and a low-density polyethylene having a density of 20 μm of resin having a density of 0.931 on the back surface. A layer of resin mixture was provided by extrusion coating.
[0023]
The laminated body was punched into a blank for the body, and a paper cup was created by a paper cup molding machine. Furthermore, this paper cup is heated in a dryer at 120 ° C. for 3 minutes, and as shown in FIG. 4, portions other than the concave portion C are foamed. In the concave portion C, characters other than the characters “coffee” and Braille are used. The part was not foamed, and the identification display part D of the character “coffee” and the identification display part E of Braille foamed in a convex shape, thereby obtaining a paper container with an identification display enabling reading of Braille.
[0024]
【The invention's effect】
According to the present invention, in a paper container, a convex identification display is provided on the surface by foaming a thermoplastic resin layer on the surface, so that the contents can be judged for consumers, particularly elderly people and visually impaired people. This makes it possible to obtain a paper container with an identification display, which can be used to support judgment and is not expensive to manufacture.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an embodiment of a paper container with an identification display according to the present invention.
FIG. 2 is a view showing a configuration of a laminated body forming a paper container with an identification display according to the present invention.
FIG. 3 is a view showing another configuration of a laminated body forming the paper container with identification display according to the present invention.
FIG. 4 is a perspective view showing another embodiment of the paper container with identification display according to the present invention.
[Explanation of symbols]
A Paper container with identification display according to the present invention B Foamed portion (convex portion)
C Concave part D Convex identification display part (convex part)
E Braille convex identification display (convex)
DESCRIPTION OF SYMBOLS 1 Laminated body which forms the paper container with an identification display by this invention 2 Base material layer 3 Intermediate printing layer 4 Transparent varnish layer 5 Thermoplastic resin layer (outer surface)
6 Thermoplastic resin layer (inner surface)
7 Foam suppression ink printing part
8 Convex

Claims (2)

At least from the outer surface side of the container, the moisture in the paper evaporates by heating and foams by the force of its vapor pressure, the thermoplastic resin layer on the outer surface side of the container, the base material layer mainly composed of paper, the inner surface side of the container of a paper container formed of a laminate comprising a thermoplastic resin layer was coated in advance foam control ink on a part of the outer surface of the container of the thermoplastic resin layer of the outer surface of the container, by heating the foam, In addition to providing a non-foamed recess in the foam-suppressed ink coating part, the non-coating part of the foam-suppressing ink in the recessed area is foamed to form a convex identification display. A paper container with an identification display. Water content in the paper evaporates by heating from at least the outer surface side of the container, and the thermoplastic resin layer on the outer surface side of the container foams by the force of the vapor pressure, the base material layer mainly composed of the paper, and the inner surface of the container A method of manufacturing a paper container formed of a laminate composed of a thermoplastic resin layer on the side and provided with a convex identification display on the surface, the outer surface of the container of the thermoplastic resin layer on the outer surface side of the container A foam-suppressing ink is applied in advance to a part of the resin, and a non-foamed concave portion of the foam-suppressed ink coating portion is provided by heating and foaming, and a non-coated portion of the foam-suppressing ink in the concave portion is foamed. A method for producing a paper container with an identification display, characterized in that a convex identification display having a convex portion is formed .

Images