JP2004035025A - Can with heat insulation label - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a can body of excellent heat insulation which is easily carried by hand irrespective of the temperature of the content even when a can is heated or refrigerated. <P>SOLUTION: Embossed or bead-worked recessed parts are formed on a side of a barrel of a metal can body, and an outer circumference of the barrel with the recessed parts thereon is covered with a synthetic resin heat insulation label with a relatively small thickness of 40-150μm. A space is formed between the heat insulation label and a bottom of the recessed parts. The recessed parts are circumferentially provided on the side surface of the can barrel, and the area ratio of the space part to the side surface of the can barrel is in a range of 20-85%. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a can, and more particularly, to a can provided with an insulating coating which has excellent heat insulating properties and is easy to hold by hand even when sold after being heated or cooled.
[0002]
[Prior art]
BACKGROUND ART In recent years, canned coffee drinks, tea, oolong tea, and the like have been heated and sold at vending machines, hot warmers at convenience stores, and the like. In the case of heating sale, the heating temperature is usually 50 to 60 ° C. Although this temperature is appropriate as the temperature at which the content drink is contained in the mouth, it may be too hot to directly grasp and hold the can by hand, so it is necessary to wind a handkerchief etc. or prepare a separate holding tool It was inconvenient. In addition, canned beverages have often been sold after being cooled by vending machines, but in this case too, the metal can is cold and difficult to hold, and the surface of the can has slippery water drops. Sometimes it was hard to hold. Particularly, in the case of a can whose mouth is sealed with a screw-type cap, the can must be firmly grasped at the time of opening, and if the can is hot or cold, the opening operation may be difficult. . Therefore, JP-A-52-112485, JP-A-3-240677, JP-A-11-255244, and the like describe can bodies in which a heat insulating film is wound around and adhered to the surface of a can body, but a sufficient heat insulating effect is obtained. However, there is a problem that the film thickness must be increased or a special foamable film must be used.
[0003]
[Problems to be solved by the invention]
The present invention has been made in view of the above-mentioned problems, and its object is to provide a heated or chilled beverage or canned food which is easy to hold regardless of the temperature of the contents, has excellent heat insulating properties, and maintains the heat of the contents. It is an object of the present invention to provide a labeled can body having good heat-insulating properties and having a relatively thin and simple film structure without using a special film and having excellent heat insulating properties. It is still another object of the present invention to provide a can which is easy to grasp by hand and open even when the can is heated or refrigerated even when the can is sealed with a screw-type cap.
[0004]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 of the present invention provides a can provided with a concave portion on the side of the can body, and the outer periphery of the can body covered with a heat insulating film, wherein the heat insulating label and the bottom of the concave portion are provided. A can having a gap between the cans. Since there is a gap between the heat-insulating label and the concave metal can body surface, there is a part where the label does not directly contact the can body surface. It is hard to feel hot or cold even when grabbed, and easy to hold. In addition, since the surface of the can body has irregularities and some irregularities are formed on the outer surface of the label even through the heat insulating label, the can body is less slippery and easy to grasp. The concave portion on the side of the can body can be formed by subjecting the metal plate of the can body to embossing, beading, bending, or the like.
The invention according to claim 2 of the present invention is the can according to claim 1, wherein the concave portion is provided circumferentially on the can body side surface, and a ratio of an area occupied by the void portion on the can body side surface is: 20 to 85%. According to this, there is an advantage that the can is easy to hold because the concave portion, that is, the place where the heat insulating label does not directly contact the metal of the can body extends over the entire circumference of the can body and exists in a range that can be sufficiently grasped by fingers. Here, the side of the can body refers to the side of the cylindrical portion (including the concave portion) between the bottom of the can and the neck-in portion.
Further, the invention according to claim 3 of the present invention is characterized in that, in the can according to claim 1 or 2, the heat-insulating label is made of a synthetic resin film having a thickness of 40 to 150 μm. According to this, there is an advantage that the label is relatively inexpensive because a relatively thin label is used.
The invention according to claim 4 of the present invention is characterized in that, in the invention according to claims 1 to 3, the opening of the can is sealed with a screw-type cap. Although the screw-type cap requires a relatively large force at the time of opening, according to the present invention, it is possible to provide a can which can be easily grasped and opened even when the contents are heated or cooled.
[0005]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIGS. 1, 2, and 3 are a front view, an AA 'sectional view, and a BB' sectional view of a can 1 with an insulated label of the present invention, respectively. A can with an insulated label is roughly divided into a can 1 made of metal, a screw-type cap 2, and an insulated label 3 that covers the side of the can. The can body 1 is formed by press-forming a metal plate such as a tin plate or TFS or a metal plate such as an aluminum alloy plate into a cylindrical shape having a bottom, then subjecting the opening end portion to a mouth drawing process, and further screwing the opening portion with a cap. Thread is formed. The mouth may be formed by pressing a bottomed cylindrical cup and then processing the bottom. In this case, a separate can bottom cover is double-tightened to the open end side of the cup. Further, the mouth is not limited to the one integrally formed with the can body, and a separate metal lid having the mouth may be wound around the can body. In this case, the forming of the can body is not limited to the press forming, but may be a rectangular metal plate formed into a tubular shape by welding, bonding, or the like. Further, when the conventional easy-open lid that lifts and opens the tab as the lid is fastened, the can body may be a normal substantially cylindrical can.
In a can body whose opening is sealed with a screw-type cap, it is necessary to hold the can body firmly at the time of opening, as compared with a conventional tab-lifting easy-open lid, and the effect of the present invention is easily exerted.
[0006]
In the can of the present invention, a concave portion 4 is provided on the side of the can body. The concave portion on the side of the can body can be formed by embossing, beading, bending, or the like on the metal can body. Further, the remaining portion may be made relatively concave by performing a partial overhanging process on the side surface of the can body. The recess 4 forms a gap 5 between the can body 1 and the label 3. Due to the heat insulating effect of the air layer of the gap 5, the heat of the heated or cooled contents is less likely to be transmitted to the fingers, and the can body is easily held, as compared with the case where the metal can body or the label in close contact with the can body is gripped. .
[0007]
It is preferable that the concave portion on the side surface of the can body is provided circumferentially on the side surface of the can body, and the ratio of the area occupied by the void portion to the side surface of the can body is 20 to 85%. In this case, there is a place where the heat-insulating label does not come into direct contact with the metal of the can body, and it is wide enough to be grasped by the fingers, and it exists over the entire circumference of the can body. It has the advantage that it can be easily held.
[0008]
In addition, it is preferable that a large number of small concave portions are distributed at the above-described ratio over the entire circumference of the can body, since a void is easily formed between the concave portion and the label. For example, in the can body of FIG. 1, a polyhedral wall composed of diamond-shaped depressions is provided circumferentially all around the can body, as shown in FIGS. In the case of a can having a can body diameter of about 53 to 66 mm and containing 200 to 350 ml, the size of the diamond-shaped depression (recess) is such that the maximum length L in the can body axial direction and the maximum length w in the can circumferential direction are 1 to 3 cm, respectively. In particular, it is preferably in the range of 1.5 to 2.5 cm, and the maximum depth d of the recess is in the range of 0.5 to 5 mm, especially in the range of 0.8 to 2 mm. When these dimensions L, w, and d are smaller than the above ranges, it is difficult to form a gap between the label and the surface of the can body, and it is difficult to hold them. Becomes difficult.
In the present invention, the concave portion is not limited to a polyhedral wall composed of rhombic constituent unit surfaces, but may be another polygonal shape, a circular shape, a circumferential shape, or a bead in a can axis direction.
[0009]
A conventionally known method can be applied to the formation of the concave portion on the side surface of the can body. For example, as shown in FIG. 6, the concave portion is formed by sandwiching the can body portion 10 between the inner mold 11 and the outer mold 12 and embossing. Corresponding to the recesses to be formed, the inner mold and the outer mold to be used are respectively recessed and have projections on the surface, and these inner molds and outer molds are engaged through the container body, and By rotating these at a synchronized speed, a recess is formed on the surface of the can body side wall.
[0010]
In the present invention, the inner and outer surfaces of the metal plate constituting the can body are usually covered with a corrosion-resistant organic film such as a paint or a thermoplastic resin film. This organic coating can be applied before or after forming the metal material or can body, or after forming the recess. The protective coating is formed by providing a protective coating or by laminating a thermoplastic resin film.
[0011]
As the protective coating, any protective coating composed of a thermosetting or thermoplastic resin: for example, a modified epoxy coating such as a phenol-epoxy coating or an amino-epoxy coating: a vinyl chloride-vinyl acetate copolymer, a vinyl chloride-vinyl acetate copolymer Partially saponified polymer, vinyl chloride-vinyl acetate-maleic anhydride copolymer, epoxy-modified, epoxyamino-modified or epoxyphenol-modified vinyl or modified vinyl paint such as vinyl paint: acrylic resin paint: styrene-butadiene A single or a combination of two or more of synthetic rubber paints such as a copolymer is used.
These paints are applied to metal materials in the form of an organic solvent solution such as enamel or lacquer, or in the form of an aqueous dispersion or aqueous solution, such as roller coating, spray coating, dip coating, electrostatic coating, electrophoretic coating, etc. Apply. Of course, when the resin coating is thermosetting, the coating is baked if necessary. From the viewpoint of corrosion resistance and workability, the protective coating preferably has a thickness of 2 to 30 μm, particularly 3 to 20 μm in a dry state. Further, in order to improve the processability, various lubricants can be contained in the coating film.
[0012]
Examples of the thermoplastic resin film used for lamination include olefin-based resin films such as polyethylene, polypropylene, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, ethylene-acryl ester copolymer, and ionomer, polyethylene terephthalate, and polybutylene. Polyester films such as terephthalate and ethylene terephthalate / isophthalate copolymer: polyamide films such as nylon 6, nylon 6,6, nylon 11, and nylon 12: polyvinyl chloride films: polyvinylidene chloride films, and the like. These films may be unstretched or biaxially stretched. It is desirable that the thickness is generally in the range of 3 to 50 μm, particularly 5 to 40 μm. Lamination of the film on the metal material is performed by a heat fusion method, dry lamination, extrusion coating method, or the like. If the adhesiveness (heat fusion property) between the film and the metal plate is poor, for example, a urethane-based film is used. An adhesive, an epoxy-based adhesive, an acid-modified olefin-based adhesive, a copolyamide-based adhesive, and a copolyester-based adhesive can be interposed.
[0013]
Next, the heat insulating label of the present invention wound around the outer periphery of the can body having the concave portion will be described. As the material of the label to be used, a polyester resin such as a polyethylene terephthalate resin or a polybutylene terephthalate resin, a copolymerized polyester resin such as a copolymer of polyethylene terephthalate and isophthalic acid, a polyolefin resin such as polyethylene or polypropylene, Polyamide resin, or a mixture of the above resins, a synthetic resin film composed of a laminate, and a biaxially stretched film composed of a polyester resin such as a polyethylene terephthalate resin may be used. It is preferable in terms of workability, workability, toughness, glossiness and cost. The thickness of the synthetic resin film is preferably from 40 to 150 μm, particularly preferably from 50 to 100 μm, in view of heat insulation, scratch resistance, workability and cost.
It is to be noted that the above-mentioned materials are preferable as the material of the label. However, as long as the material has an excellent heat insulating effect, the material composition, the layer structure, and the like are not particularly limited to the above-mentioned materials, and can be used. Examples of such a heat insulating label include a foam plastic film label, a nonwoven fabric label, a paper label, and a foil label. These labels may be used alone, or two or more kinds of materials may be laminated to be used as labels.
[0014]
In the present invention, the heat insulating label is preferably adhered to the surface of the can body via an adhesive. By bonding with an adhesive, the heat-insulating label does not shrink even when heat is applied to the can body, and has good heat resistance unlike coating with a shrink label, and can be applied to retort sterilization applications. Examples of the adhesive include a thermoplastic resin and a thermosetting resin. In particular, it is preferable to use a thermosetting resin in terms of processability and heat resistance. The thermosetting resin is a polyester, urethane, epoxy, acrylic, amino, etc. alone or a composition obtained by adding a curing agent to these and a composition obtained by mixing two or more resins. It is applied in consideration of the adhesiveness with. Adhesives to which various pigments have been added may be applied to improve the appearance of the can body.
The application of the adhesive may be performed on the entire surface of the label or may be performed partially. According to the partial application, for example, it is also possible to provide a passage for allowing air remaining in the cavity of the concave portion to escape from the end of the label during retort sterilization. In addition, the air remaining in the gap can be released by making a fine hole in the label.
[0015]
In addition, it is preferable that the heat-insulating label is provided with a printing layer on the inner surface or outer surface of the can. Examples of the method of forming the print layer include gravure printing and flexographic printing, and the method of forming the print layer by gravure printing is particularly preferable in that a print layer with clear image quality and high quality can be obtained.
Further, it is preferable to provide a protective film on the outermost surface of the heat-insulating label for improving the slipperiness of the can body and preventing damage. Examples of the material of the protective film include known finish varnishes of acrylic, polyester, epoxy and alkyd resin paints commonly used for metal cans.
[0016]
When using a label of a type that adheres to the side of the can body via an adhesive as an insulated label, the mounting of the label on the can body is performed in a can-making process after the recess is formed in the can body. . As the bonding method, a conventionally known method can be applied, and is described in, for example, JP-A-3-230940 and JP-A-2001-179830.
[0017]
In the present invention, as the heat insulating label, in addition to the type that adheres to the can body via the above-described adhesive, a label that does not adhere to the can body such as a shrink label or a stretch label can also be used. . As such a label, for example, a label formed by forming a shrinkable film such as polyvinyl chloride, polyester, polystyrene, or polypropylene into a tube having a thickness of 40 to 150 μm, preferably 50 to 100 μm can be used.
[0018]
In the case of a heat-insulated label composed of a shrink label or a stretch label, the label is attached to the can body after filling the can body with a can lid or a cap and sealing it after passing through a sterilization step. This can prevent the heat-insulating label from shrinking due to the heat of the sterilization process.
[0019]
【Example】
Next, the present invention will be described specifically with reference to examples.
Embodiment 1 FIG. A 20 μm-thick biaxially stretched polyethylene terephthalate / isophthalate copolymer film having a thickness of 0.24 mm and a tin-free steel plate having a tempering degree of T-2.5 is formed on the side serving as the inner surface of the can. A 15 μm-thick biaxially oriented polyethylene terephthalate / isophthalate copolymer film containing 20% by weight of titanium oxide on the side was simultaneously heat-bonded on both sides simultaneously at the melting point of the film and immediately cooled with water to obtain a thermoplastic resin-coated metal plate. After uniformly applying the glamor wax to the metal plate coated with the thermoplastic resin on both sides, a deep drawing cup was formed by drawing, thinning, redrawing, and ironing (thinning 30%). Then, after performing doming molding according to a conventional method, the deep drawing cup was heat-treated at 215 ° C. for 1 minute to remove processing distortion of the film and volatilize the lubricant. Then, the edge of the opening was trimmed to obtain a metal can having a diameter of about 53 mm and a height of about 135 mm. On the can body of this bottomed can body, a circumferential polyhedron pattern was engraved circumferentially by the method shown in FIG. 6 to form a concave portion. The constituent unit surface in this pattern was a quadrilateral, with w = 18.78 mm, L = 18.78 mm, R = 0.2 mm, and h0 = 1.23 mm.
On the other hand, gravure printing (thickness: about 1 μm) is performed on one surface of a label base made of a biaxially stretched polyethylene terephthalate film having a thickness of 60 μm with an ink made of a urethane-based resin to form a printing layer. A polyester-based thermosetting resin adhesive layer of about 5 μm was formed, and the adhesive layer was in a dry state. The printed film was slit into a width of about 90 mm and a length of about 170 mm to form an insulated label 4 for one can wound around a can.
Next, while heating the can body of the metal can having the concave portion by high-frequency induction heating, a heat insulating label printed on the outer peripheral surface of the can body from the bottom to a height of about 10 to 100 mm is applied from the adhesive layer side. Then, they were adhered along the entire circumferential direction of the can body by a pressure roller. Subsequently, the opening was formed into a mouth having a diameter of 42 mm by multi-stage drawing, and a thread for screwing with the cap was formed on this side wall by rolling to obtain a can with a heat-insulating label shown in FIG. Note that the formation range of the concave portion of the can body was about 50% of the can body portion from above the bottom to below the shoulder.
Comparative Example 1 A can with an insulated label was obtained in the same manner as in Example 1 except that no concave portion was formed in the can body.
[0020]
Embodiment 2. FIG. The same as in Example 1 except that a tubular shrink label having a width of 90 mm, a length of 170 mm, and a thickness of 60 μm was used as a heat-insulating label in a tube shape, and was attached to a can body having a concave portion and heat-shrinked. To obtain a can with an insulated label.
Comparative Example 2. A can with an insulated label was obtained in the same manner as in Example 1 except that no concave portion was formed in the can body.
[0021]
These cans were filled with a coffee beverage, and an aluminum cap was wound tightly with a capper and sealed, and then stored in a 60 ° C. thermostat for 1 day. After that, the heated can was grasped with a bare hand from the incubator and taken out, and the heat of the can was felt by a panel consisting of 20 members of Toyo Seikan Co., Ltd. Of the 15 persons, the results of the cans of the examples were that they did not feel the heat and were easy to grasp and open. The results of the remaining five panelists were equivalent for both cans.
[0022]
【The invention's effect】
According to the present invention, the can body is covered with a thin film having a relatively simple thickness due to the heat insulating effect of the air layer in the gap between the can body recess and the label under the heat insulating label wound on the can body. Nevertheless, there is provided a can with a heat-insulated label, which can be easily held in a hand, regardless of the temperature of the heated or chilled can, and has excellent heat insulating properties.
[Brief description of the drawings]
FIG. 1 is a front view showing an embodiment of a can with an insulated label of the present invention.
FIG. 2 is a sectional view taken along line AA 'of the can shown in FIG.
FIG. 3 is a sectional view taken along line BB 'of the can shown in FIG.
FIG. 4 is a plan view of a structural unit surface of a concave portion (polyhedral wall) formed on a side surface of a can body of the can shown in FIG. 1;
FIG. 5 is a vertical sectional view of a structural unit surface shown in FIG. 1;
FIG. 6 is a perspective view illustrating a method of forming a concave portion in a can body.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Can body 2 Cap 3 Insulation label 4 Recess 5 Void

Claims (4)

A can having a concave portion provided on a side surface of the can body and covering the outer periphery of the can body with a heat-insulating label, wherein the can has a gap between the heat-insulating label and the bottom of the concave portion. 2. The can according to claim 1, wherein the concave portion is provided circumferentially on the side surface of the can body, and a ratio of an area occupied by the void portion to the side surface of the can body is 20 to 85%. 3. The can according to claim 1, wherein the heat-insulating label is made of a synthetic resin film having a thickness of 40 to 150 μm. The can according to any one of claims 1 to 3, wherein the can has an opening sealed with a screw-type cap.

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