JP2002200900A - Can with three-dimensional hologram - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce an excellent decorative effect on the body of a can by a method wherein a three-dimensionally irregular part is formed on at least a portion of the body of the can, and a hologram is produced on the surface of the irregular part, whereby in addition to a feel of solid bodies due to three- dimensional irregularities, many-sided, several interference color images can be formed. SOLUTION: In the can with a three-dimensional hologram, a three- dimensionally irregular part is formed on at least a portion of the body of the can, and a hologram is produced on the surface of the irregular part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a can with a three-dimensional hologram, and more particularly to a can with a three-dimensional hologram in which a multifaceted and multidimensional interference color image is developed.

[0002]

2. Description of the Related Art A hologram is easy to reproduce a three-dimensional image of an object and has a decorative property that shines in a rainbow color. It is used in the fields of publishing and printing such as magazine covers and illustrations. Furthermore, holograms can be multiplex-recorded or high-density-recorded, and they are applied as optical memories. Their production requires precision equipment, so they cannot be easily forged, so securities, credit cards, ID cards, etc. Etc. are also used in such fields.

[0003] It has already been proposed to attach a hologram to a packaging material or a container. Japanese Utility Model Laid-Open Publication No. 62-143663 discloses that a hologram is provided on a part or the entire surface of a base material of a packaging material. JP-A-63-70934 describes a container characterized in that a multiplex hologram is provided inside or outside a vessel wall of a transparent cylindrical container. Have been.

Japanese Patent Publication No. 54238/1992 discloses a substantially flat plate in which a hologram is formed in an uneven shape on a gentle curved surface convex toward the surface, and a flat plate having a smooth surface. A method of manufacturing a hologram is described in which a metal material is pressed in a direction perpendicular to a surface, and a relief hologram is transferred to the surface of the metal material by plastic deformation of the metal material.

[0005]

Although the hologram is capable of reproducing a three-dimensional image as described above, it is excellent in design and decorativeness such that its color changes to each rainbow color depending on the viewing angle. In a three-dimensional container such as a can,
There is a demand for the appearance of a hologram-equipped container that is more excellent in design and decoration by making use of its three-dimensional characteristics.

The present inventors have proposed that at least a part of the
By forming the three-dimensional irregularities and making the hologram appear on the surface of the irregularities, in addition to the three-dimensional effect due to the three-dimensional irregularities, a container with a hologram having a multifaceted and multidimensional interference color image can be obtained. It was found that it could be obtained.

[0007]

According to the present invention, a three-dimensional uneven portion is formed on at least a part of a can body, and a hologram is exposed on the surface of the uneven portion. A can with dimensional hologram is provided. In the three-dimensional hologram can of the present invention, it is particularly preferable that the three-dimensional uneven portion is formed of a circumferential polyhedral wall. In this case, the circumferential polyhedral wall is a boundary between the structural unit surfaces and the structural unit surfaces in contact with each other. A ridgeline and a boundary ridgeline intersecting with each other, and the boundary ridgeline and the crossover portion are relatively convex to the outside of the container as compared with the constituent unit surface, and the constituent unit surface is smooth between the opposed crossover parts. It is preferable that the arrangement in the container axial direction adjacent to the structural unit surface in the circumferential direction has a phase difference.
In addition, the present invention can be applied to a three-dimensional uneven portion formed of an embossed portion or a three-dimensional uneven portion formed of a beaded portion. Further, the hologram may be a hologram which is directly formed on a metal body of a can or a metal material for forming a can body prior to the formation of the three-dimensional uneven portion, or the hologram may be formed prior to the formation of the three-dimensional uneven portion. It may be a hologram processed film or label laminated or affixed to the body or can body forming metal material, or the hologram may be applied to the can body or the can body forming metal material prior to the formation of the three-dimensional irregularities. The hologram printing may be performed. Alternatively, the hologram may be a film obtained by forming a three-dimensional uneven portion and then performing a hologram process on the film, thereby causing the film to adhere by shrinkage.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [Operation] In the can with a three-dimensional hologram of the present invention, a three-dimensional uneven portion is formed on at least a part of the can body, and a hologram appears on the surface of the uneven portion. Thus, in addition to the three-dimensional effect due to the three-dimensional unevenness, a multifaceted and multidimensional interference color image can be expressed, and a novel decorative effect can be obtained.

FIGS. 1 and 2 show a circumferential polyhedral wall can as a typical example of a can with a three-dimensional hologram. In FIGS. 1 and 2, the can is wound around a can body 1 and both ends of the can body 1. It has a three-piece structure with the can lids 2a and 2b, but of course may have a two-piece structure with a bottomed seamless can body and a can lid. At least a part of the side surface of the can body 1 is formed with a peripheral polyhedral wall in which quadrangular constituent unit surfaces 3 connecting vertexes a, b, c and d are combined. The structural unit surface 3 has boundary edges ab, bc, cd, and d-
It is adjacent to another structural unit surface via a. Boundary ridge line a
-B, bc, cd and da and intersections a, b,
c and d are relatively convex to the outside of the container as compared to the structural unit surface 3, and the structural unit surface 3 has a smoothly recessed portion between the opposing intersections ac, and A container axial direction array adjacent in the circumferential direction has a phase difference (1/2 in the figure). In the present invention, at least one hologram 4 is provided for the structural unit surface 3.

Now, assuming that the number of structural unit surfaces arranged in the bd circumferential direction is n, the inclination angle (radian) of the structural unit surface adjacent to the right direction with respect to the bd base line is sequentially in a counterclockwise direction. 2π / n, 2 (2π / n), 3 (2π / n), 4 (2π
/ N) ‥, and the inclination angles (radians) of the constituent unit surfaces adjacent to the left direction with respect to the b-d base line are sequentially 2π [(n−1) / n], 2π [(n− 2) / n], 2
π [(n−3) / n], 2π [(n−4) / n] ‥. With respect to the series of constituent unit planes, a series of constituent unit planes adjacent to each other in the vertical direction and having a phase difference of 配置 is arranged.
The same arrangement of the inclination angles as described above is established. Also, in the actual circumferential polyhedral wall, the change of the inclination angle is more diverse, and as shown in FIGS. 1 and 2, the center of the structural unit surface is inwardly concave, so that the inclination of the surface is reduced. Changing the angle is more complicated.

The hologram enjoys subtle changes in the interference color (rainbow color) and the appearance of the three-dimensional image depending on the angle. In the can with a three-dimensional hologram of the present invention, the inclination angles are mutually different as described above. Since a number of different uneven surfaces are formed and a hologram is formed on each of the uneven surfaces, a multi-dimensional and multi-dimensional hologram in which interference colors (rainbow colors) and the appearance of a three-dimensional image are slightly changed. A new and remarkable effect that an image is reproduced can be obtained.

In the can with a three-dimensional hologram of the present invention, the three-dimensional concavo-convex portion formed on the can body may be formed by forming the above-mentioned circumferential polyhedral wall on the side surface of the can body or by bead molding. Or embossed.

FIG. 3 of the accompanying drawings is a side view (A) and a cross-sectional view (B) of the seamless polyhedral wall seamless can. A peripheral polyhedral wall 5 is formed on a part of the side surface of the seamless can 1. . FIG. 4 of the accompanying drawings is a side view (A) and a cross-sectional view (B) of an embossed three-piece can. An embossed part 6 that is recessed from other parts is formed on a part of the side surface of the can 1. I have. FIG. 5 of the accompanying drawings is a side view (A) and a cross-sectional view (B) of the bead-formed three-piece can. A convex bead 7 is formed on a part of the side surface of the can 1.

[Production Method of Hologram Can] In the can with a three-dimensional hologram of the present invention, the step of forming a hologram on the can body and the step of forming the three-dimensional uneven portion on the can body are performed in the order described above or in the reverse order. It is formed by performing in order. The hologram can be formed by a cold transfer method, a film laminating method, application of a shrink film, application of a transfer foil (hot stamp) described below, or the like.

(1) Cold transfer method: For example, a hologram is directly formed on a metal body or a metal material for forming a can body by forming a hologram prior to forming a three-dimensional uneven portion, and then the hologram is formed. Can be processed into a can body having a three-dimensional uneven portion. Of course, when a hologram is formed on the metal material for forming the can body, the metal material is formed into a can body having a side seam by means known per se such as welding or bonding, and three-dimensional irregularities are formed on the can body. It is good to form a part. The formation of the three-dimensional uneven portion can be performed by molding into a peripheral polyhedral wall (hereinafter also referred to as diamond cut molding) using a panel former described in detail below.

In FIG. 6 showing a process chart of the cold transfer method,
This method comprises a can forming step, a transferring step, a printing / painting step, a baking / drying step, and a processing step. In the can forming step, a metal material such as aluminum or a surface-treated steel sheet is formed into a bottomed seamless can body by means known per se such as drawing / deep drawing, drawing / ironing, drawing / bending and stretching. In the transfer step, a groove is directly formed on the body of the can by a roll press provided with a plate having a hologram in the form of irregularities on the surface, and the hologram is transferred.
In the printing / coating process, the printer performs partial printing on the can body and finish varnish application. In the baking and drying process, baking and drying of the ink and varnish applied in the printing and painting processes are performed. Finally, in the processing step, a circumferential polyhedral wall (diamond cut) is formed on the can body by a panel former.

I) Can Forming Step As the metal base for the can body, various metal plates, particularly various surface-treated steel plates and light metal plates such as aluminum are used. As the surface-treated steel sheet, a cold-rolled steel sheet is subjected to one or two or more surface treatments such as annealing, secondary cold-rolling, zinc plating, tin plating, nickel plating, electrolytic chromic acid treatment, and chromic acid treatment. Can be used. As still another example, an aluminum-coated steel sheet subjected to aluminum plating, aluminum pressure welding, or the like is used. As the light metal plate, an aluminum alloy plate is used in addition to a so-called pure aluminum plate. An aluminum alloy plate excellent in corrosion resistance and workability is Mn: 0.2 to 1.5% by weight, Mg:
0.8 to 5% by weight, Zn: 0.25 to 0.3% by weight, Cu: 0.16 to 0.26% by weight, the balance being A
l. These metal plates may be subjected to a surface treatment known per se such as a chromic acid treatment and a chromic acid / phosphoric acid treatment. The thickness of the metal plate varies depending on the type of metal, the purpose of the container, or the size thereof, but is generally 0.05 to 0.35 mm, particularly preferably 0.08 to 0.25 mm.

The forming into a seamless can body is performed by means known per se so as to reduce the thickness of the side wall portion, for example, drawing redrawing and ironing, drawing bending and redrawing, drawing bending and redrawing and redrawing and ironing. Will be For example, according to deep drawing bending and elongation molding (drawing-bending elongation redrawing),
A pre-drawing cup formed from a metal material is held by an annular holding member inserted into the cup and a re-drawing die located thereunder. A redrawing punch is arranged coaxially with the holding member and the redrawing die so as to be able to enter and exit the holding member. The redrawing punch and the redrawing die are relatively moved so as to mesh with each other. This allows
The side wall portion of the front drawing cup, from the outer peripheral surface of the annular holding member,
Through the curvature corner portion, it is bent vertically inward in a radial direction, passes through the portion defined by the annular bottom surface of the annular holding member and the upper surface of the redrawing die, and is substantially perpendicular to the axial direction by the working corner portion of the redrawing die. And can be formed into a deep drawn cup with a smaller diameter than the front drawn cup.

At this time, the radius of curvature (Rd) of the working corner of the redrawing die is set to 1 to 2.9 of the thickness (tB) of the steel sheet.
By making the dimensions twice, especially 1.5 to 2.9 times, the thickness of the side wall can be effectively reduced by bending and pulling. In addition, the variation in the thickness between the lower portion and the upper portion of the side wall portion is eliminated, and uniform thickness reduction can be achieved over the whole. Generally, the side wall of the can body is set at 8 based on the raw material thickness (tB).
The thickness can be reduced to a thickness of 0% or less, up to 45%, particularly up to 40%. In the case of a deep drawn can, the following formula (1) In the formula, D is the diameter of the sheared metal material, and d is the diameter of the punch.
It is preferable that the value be in the range of 0, that is, in the range of 1.5 to 5.0 in total. In the case of redrawing or bending and stretching, an ironing die is placed behind the redrawing die, and the following formula (2) is applied to the side wall portion. In the formula, tB is the thickness of the base plate, and tW is the thickness of the side wall.
The thickness can be reduced to about 75% by ironing. When drawing or the like, it is preferable to apply various lubricants, such as liquid paraffin, synthetic paraffin, edible oil, hydrogenated edible oil, palm oil, various natural waxes, and polyethylene wax, to a metal material or a cup, and then perform molding. .

Ii) Transfer step The hologram is transferred to the metal body of the can by a method known per se, for example, a method described in Japanese Patent Publication No. 54238/1992. According to the above method, a smooth metal surface having a center line average roughness (JIS B0601) of 0.5 μm or less and interference fringes corresponding to the wavefront of light from a document to be expressed as an image are formed on the hologram in the form of irregularities. The relief hologram is transferred to the metal surface by engaging the tool (roll) surface. After transferring the relief hologram to the metal surface, a transparent resin protective layer may be provided on the surface.

In FIG. 7 for explaining the transfer step, a plate (roll) 20 on which a hologram is formed in an uneven shape is vertically pressed against a metal substrate 10 in the form of a flat plate or a can body. Then, the hologram is transferred to the surface of the metal substrate 10 in the form of the groove processing 11. An ink layer or a finish varnish layer 12 is provided on the surface 11 to form a protective layer.

It is preferable that at least the outer surface of the metal substrate is formed of a soft metal having a Vickers hardness of 300 or less, and an aluminum plate or an aluminum-plated steel plate is suitable for this purpose.

In this case, it is preferable to form a relief hologram directly on a smooth metal surface having a center line average roughness of 0.5 μm or less, particularly 0.3 μm or less. For this purpose, a tool is used in which interference fringes corresponding to the wavefront of light from the original to be represented as an image are formed as holograms on the surface in the form of irregularities. The pitch of the irregularities in the hologram is often in the range of 0.1 to 1 μm. When the tool surface and the metal surface are engaged with each other, if the average roughness of the center line of the metal surface is within the above-described range, the transfer of the relief hologram is reliably performed. The metal substrate may be a flat metal or a metal of a can body. A can body formed by drawing and ironing has a very smooth surface and is particularly suitable for this purpose.

The tool (roll) formed on the hologram in the form of irregularities can be manufactured by any method known per se. For example, in a photographing process for plate production, a laser light source, a photoresist photosensitive layer, an original, and a reflecting mirror are arranged in a positional relationship in which a reflected light beam from the original and a reference reflected light from the reflecting mirror simultaneously enter the photoresist layer. I do. As a result, interference fringes corresponding to the wavefront of light from the original to be expressed as an image are formed on the photoresist layer.
The photoresist layer may be a negative type in which the exposed part is cured or a positive type in which the exposed part is dissolved. Next, in a development step for plate production, the exposed photoresist layer is subjected to a development treatment known per se. As a result, the uncured unexposed portions or soluble exposed portions are dissolved, and a photoresist plate having an uneven pattern on the surface is formed. Next, in a metal plate mold manufacturing process, a metal thin film layer is formed on the surface of the photoresist plate by means such as vapor deposition or electroless plating, and is subjected to an electroforming operation to form a hard metal such as nickel or chromium. Is formed. The photoresist layer 7 is mechanically peeled off or chemically dissolved from the metal plate mold to take out only the metal plate mold. Finally, in the step of transferring to a seamless can, the seamless can is brought into rolling contact with the metal plate under pressure to transfer the relief pattern of the plate to the metal surface of the container as a relief hologram.

As a method for forming a hologram of the photoresist layer, a conventionally known method can be adopted. For example,
A laser light (for example, Ar laser, 488 nm, output 5 m) is applied to an original to be expressed as an image (hereinafter simply referred to as an original).
The reflected light from the original obtained by irradiating W) and the reference light split from the same light source are simultaneously incident on a photoresist-coated dry plate, and interference fringes corresponding to the wavefront of light from the original are recorded on the dry plate. By doing so, the photographing of the original
After 0 minutes, this is developed to obtain a concavo-convex pattern of interference fringes. Photoresist is usually low in sensitivity, so it is necessary to take an image using a silver halide photosensitive material once to obtain an original hologram, adhere it to the photoresist, expose it to the photoresist through the original hologram, and remove the interference fringes of the original hologram. A method of copying onto a photoresist and then developing the photoresist can also be adopted.

As the photoresist layer, a photoresist material known per se utilizing a photo-releasing reaction, a photo-decomposition reaction, a photo-redox reaction, a photo-polymerization reaction, a photo-crosslinking reaction, etc., for example, a diazo resin, a cyclized polyisoprene resin, A phenol resin, a novolak resin, or the like can be used. Next, on the surface of the photoresist original plate, a thin gold film by a vapor deposition method,
Alternatively, conductivity is imparted by forming a silver thin film by electroless plating, and using this thin film as an electrode, a metal plating layer of nickel plating or the like is formed on the surface of the photoresist original plate by 0.1 to 5 mm, particularly 0.5 to 5 mm by a normal electroplating method. A tool is formed by forming a 2 mm thick film, peeling it off, and attaching or embedding it on the base of the tool. The shape of the tool may be flat, cylindrical or cylindrical. The film formed by the above-mentioned electroforming method can be used in a state of being connected to a cylindrical shape and fitted into a cylindrical or cylindrical tool base.

It is important that the contact between the metal surface on which the hologram is to be transferred and the tool surface be made substantially in line contact. That is, by performing transfer substantially by line contact, it becomes possible to transfer the uneven hologram on the tool surface in the form of a relief with a relatively small processing force with excellent dimensional accuracy and reproducibility. When the transfer is performed in a state where the metal material is in the form of a flat plate, the line contact can be made substantially by making the tool cylindrical or cylindrical. When the metal material is cylindrical or cup-shaped, the tool may be cylindrical or flat. The pressure used for the transfer is such that the pattern of the plate is transferred to the surface of the metal substrate as a relief hologram, and is generally 5 to 50 kgf / mm ² , particularly 10 to 30 kgf / mm ^2.
Is appropriate. Although the transfer temperature is sufficient at room temperature, it may be cooled if desired.

Iv) Printing / Coating Printing can be performed by a printing method known per se, for example, lithographic printing, letterpress printing, gravure printing, screen printing, electrophotographic printing, and the like. Known inks such as oxidatively polymerized drying ink, penetrating drying ink, thermosetting ink, two-part curable ink, and ultraviolet curable ink are used.

In general, it is preferable to transfer a hologram to a metal surface and then form a transparent resin protective layer on the surface. The coating can be used, but is not limited to, thermosetting resin coatings such as phenol-formaldehyde resin, furan-formaldehyde resin, xylene-formaldehyde resin, ketone-formaldehyde resin, urea formaldehyde resin, melamine-formaldehyde. Resin, alkyd resin, unsaturated polyester resin, epoxy resin, bismaleimide resin, triallyl cyanate resin, thermosetting acrylic resin, silicone resin, oily resin, or thermoplastic resin paint, for example, vinyl chloride-vinyl acetate Copolymers, partially saponified vinyl chloride-vinyl acetate copolymers, vinyl chloride-maleic acid copolymers, vinyl chloride-maleic acid-vinyl acetate copolymers, acrylic polymers, saturated polyester resins, etc. . These resin coatings may be used alone or in combination of two or more. At this time, the film thickness to be formed is 1
It is preferably from 15 to 15 μm, particularly preferably from 3 to 10 μm. If the thickness is larger than the above range, the hologram may not be clearly seen. If the thickness is smaller than the above range, the hologram may not function as a protective layer. The coating can be performed by a conventionally known method such as a spray method and a roll method. Baking of the coating is 160 to 240
It is preferably performed at a temperature of ° C. for 1 to 15 minutes.

V) Three-dimensional unevenness processing In the can with a three-dimensional hologram of the present invention, the three-dimensional unevenness formed on the can body means that the above-mentioned circumferential polyhedral wall is formed on the side surface of the can body. Or bead-shaped or embossed. The present invention is applicable to all cans having these three-dimensional irregularities, but in the present invention, a particularly remarkable effect is obtained when a circumferential polyhedral wall is formed on the side surface of the can body. Although an example will be described, the present invention is not limited to this example.

As already pointed out, the peripheral polyhedral wall is composed of constituent unit surfaces, a boundary ridge line where the constituent unit surfaces are in contact with each other, and a crossing portion where the boundary ridge lines cross each other. What is a structural unit plane?
It is a unit surface that appears repeatedly in the axial direction (container height direction) and the circumferential direction of the circumferential polyhedral wall, and this surface may be a bent surface described in detail below. The constituent unit surfaces are in contact with each other via a boundary ridge line in the axial direction and the circumferential direction, and an intersection, that is, a vertex exists at a position where the boundary lines intersect.

In the embodiment shown in FIGS. 1 and 2, the constituent unit surface is formed of a quadrilateral (diamond) abcd, and the adjacent arrangement of the constituent unit surfaces in the direction of the can axis forms a phase difference of exactly 1/2. Are arranged. FIG. 8 shows an example of a quadrilateral unit surface of a polyhedron wall used for the can body of FIG. 1, and a rhombic abcd is a constituent unit surface.
Each side ab, bc, cd, da in the rhombus is a side corresponding to a boundary ridge line formed on the side surface of the can, and vertices a, b, c, d that are outwardly convex correspond to the intersection.

The upper apex a and the lower apex c are located on a circumferential surface having the same diameter, and the left apex b and the right apex d are located on a circumferential surface having the same diameter. When the array has a half phase difference, all the vertices are located on the circumferential surface of the same diameter, and the inner radius of the can corresponding to these vertices is the maximum radius r. On the other hand, each ridge line ab, bc, cd, da protrudes most radially outward at the end, but the distance from the central axis of the can, that is, the diameter decreases toward the middle. Taking the diameter s at the midpoint of the diagonal line bd in the circumferential direction, this diameter s is smaller than r, and gives the minimum inner radius at the midpoint of the diagonal line bd in the circumferential direction. When the unit surface on the can body is projected in the axial direction, the apex ac overlaps, but the diagonal ac in the axial direction does not overlap with the diagonal bd in the circumferential direction and is located radially outward from the diagonal bd. It will be understood that the quadrilateral abcd is a curved or bent surface.

In FIG. 8, when the length of the diagonal line bd in the circumferential direction is W and the height of the diagonal line ac in the axial direction is L, W and L are respectively defined in the circumferential direction of the structural unit surface. It is the maximum width and the maximum length in the axial direction. It is clear from the above description that the length ac (height L) of the diagonal in the axial direction is different from the length in the ac cross section on the actual structural unit surface. It should be noted that the length may differ from the actual length in the bd cross section on the component unit surface. For example, in the case of FIG. 8B showing the ac cross section of FIG. 8A, the midpoint e of the side ac in this cross section is located more radially outward than the position of the circumferential diagonal line bd. Therefore, the side bed is larger than the length W of the circumferential diagonal line bd. The distance between the diagonal line between the intersection points that gives the maximum width in the circumferential direction of the structural unit surface and the diagonal line between the intersection points that gives the maximum length in the axial direction of the structural unit surface (the length of a line connecting both diagonal lines at right angles) is d ₀ and When the distance between the diagonal between crossover points providing a maximum axial length of the position and the structural unit faces the measurement line of the distance d ₀ intersects the structural unit face is d, FIG. 8 (b)
In the case of d, d is smaller than d _0, but conversely, d may be larger than d ₀ or equal.

In a can body having a polyhedral wall formed by combining such unit constituent surfaces, as shown in FIG. 8, the constituent unit surfaces appear as curved or U-V shaped depressions. Such a configuration of the unit surface and the phase arrangement of approximately 1/2 provide the can body with deformation resistance, and furthermore, the surface area of the can body before forming the polyhedron wall and the surface area of the can body after forming the polyhedron wall are substantially reduced. Molding is possible while maintaining approximately equal. For this reason,
Less tendency for coating damage to occur, excellent corrosion resistance is maintained, little residual stress after processing, and decrease in coating adhesion and seam adhesion over time during retort sterilization and subsequent aging. Effectively resolved.

The constituent unit surfaces of the polyhedral wall are formed as quadrilaterals,
The one in which the structural unit surfaces are alternately and firmly introduced into the side wall of the can is most excellent in preventing deformation of the can due to external pressure. When the rhombic unit surface is smoothly curved around the line bd and the curved portion is arranged so as to be convex inward, the strength of the can is large and the corrosion resistance is particularly excellent.

In the present invention, at least one hologram is arranged on each structural unit surface. That is, a single hologram can be provided so as to straddle the line bd of the rhombic unit surface, and the triangular surfaces abd and bdc as shown in FIG.
One hologram can be arranged for each.
It has been found that when a container is provided with a polyhedral pattern and a hologram, recessed portions rather than protruding portions have a significant effect on the decorative effect. That is, in general, if there is a part where the dent is deeply refracted, this part tends to become a shadow,
It makes it difficult to see the printed image on the surface, reduces the decorative effect,
Although it will impair the aesthetic appearance, in the polyhedral hologram pattern of the present invention, since the constituent unit surfaces are smoothly recessed inside the container between the intersections facing each other, the constituent unit surfaces have a smooth shape close to a very flat surface, Moreover, since a glitter pattern by the hologram appears on each structural unit surface, the decorative effect is enhanced.

The can having the peripheral polyhedral wall formed on at least a part of the can body includes an inner mold having the hologram-formed can body side wall inserted into the can body and an outer mold arranged outside the can body. Between the outer mold and the inner mold relative to the outer mold and the inner mold. When moved, the shape obtained by subtracting almost the can body thickness from the envelope at the position where the perpendicular from the center of the inner mold to the outer mold and the inner mold surface intersect, and the number of repetitions of the circumferential surface of the polyhedral wall to be molded and It has the same number of repetitions, and is manufactured by synchronizing and moving the inner mold and the outer mold relatively to perform molding.

The details of this manufacturing method and apparatus are described in Japanese Patent Publication No. Hei 7-96139 filed by the present applicant.

(2) Film laminating method: In FIG. 9 showing the steps of the film laminating method, this method comprises a can forming step (previous step), a hologram transfer step, and a processing step of a three-dimensional uneven portion. In the film laminating method, the can forming step and the processing step of the three-dimensional uneven portion are:
It is similar to that of the cold transfer method. In the transfer step of the film laminating method, a film in which a hologram is formed in advance on the surface of the can body formed in the previous step is pressed under heat and pressure using a laminator.

Referring to FIG. 10 for explaining a transfer step by film lamination, a laminating film 30 is used.
Is a plastic hologram forming layer 31, an adhesive layer 32 provided on one side thereof, and an ink layer 3 provided therebetween.
The laminating film 31 is provided with the adhesive layer 32 in a positional relationship facing the metal body 10 of the can body, and is bonded and integrated under heating and pressure.

For the reproduction of a hologram on plastic, a method of directly forming a hologram by exposure and interference using a photosensitive material, a method of forming a surface relief type hologram by embossing a smooth plastic material, and the like. Has been known for a long time. In the present invention, any of the holograms manufactured by the above-described conventionally known method can be used as the plastic hologram forming layer 31. Further, a thin metal film formed by vapor deposition or electroless plating can also be used as in the cold transfer method used in the plate manufacturing method.

In the former direct hologram production method, a method in which a layer of a photoresist material is provided on a plastic film substrate is used, and a hologram is produced by exposure and interference. Examples of the plastic film substrate include polyolefins such as high-density polyethylene, polypropylene and poly-4-methyl-1-pentene; nylon 6, nylon 6
6, polyamides such as nylon 6-10 and nylon 11,
Polyethylene terephthalate, polybutylene terephthalate, thermoplastic polyesters such as polyethylene naphthalate, polycarbonate, polyphenylene oxide,
Heat-resistant thermoplastic resin films such as polysulfone are suitable, and these films are preferably uniaxially or biaxially stretched and heat-fixed. As a photoresist material and a means for producing a hologram by exposure and interference, those used for production of a plate by the cold transfer method are similarly used.

In producing the relief hologram by the latter embossing, the above-mentioned plastic film substrate was similarly used, and the plate used for the embossing was used for cold transfer to metal. A similar version is used. The hologram is transferred to the surface of the film substrate by pressing the plate on which the relief hologram is formed against the plastic film substrate under heat and pressure. In this pressing operation, it is preferable to press the plate while maintaining the temperature at a temperature higher than the melting point of the plastic film substrate, while maintaining the temperature of the plastic film substrate at a temperature lower than its melting point. When pressing is performed with such a temperature gradient, the surface portion to which the hologram is transferred is maintained at a temperature equal to or higher than the melting point of the film, and the transfer of the hologram is effectively performed, while the other portions of the film are lower than the melting point. Since the temperature is kept low, there is an advantage that the thermal deformation of the film can be prevented and the productivity of hologram transfer is improved. The plate is heated by heat conduction, infrared heating,
Heating means known per se such as high-frequency induction heating is used. However, when high-frequency induction heating is used, heating of the surface of the plate can be selectively and intensively performed, so that the hologram has excellent fidelity reproducibility and productivity. Benefits.

As the hologram forming layer of the laminating film, the thickness of the base film is generally 5 to 30 μm.
m, and particularly preferably in the range of 9 to 12 μm, from the viewpoint of hologram holding properties and laminating workability.

As the adhesive layer, any resin material that exhibits thermal adhesion to a metal substrate at a temperature lower than the melting point of the film substrate is used. As the adhesive, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, ethylene-methyl methacrylate copolymer, ion-crosslinked olefin copolymer (ionomer), ethylenically unsaturated carboxylic acid or anhydride thereof A modified olefin resin such as an olefin resin graft-modified with: a relatively low melting point to low softening point polyamide or copolyamide resin; a relatively low melting point to low softening point polyester or copolyester resin; a blend of these resins; Blends comprising one or more of these resins and / or known pigments or fillers, urethane-based, titanate-based, epoxy-based anchoring agents and adhesives can be mentioned. As the base polymer of the acid-modified olefin resin, low-, medium-, high-density polyethylene, linear low-density polyethylene,
Examples include isotactic polypropylene, propylene-ethylene copolymer, ethylene-vinyl acetate copolymer, and the like. The thickness of the adhesive layer varies depending on the type thereof, but is generally 1 to 8 μm, particularly 3 to 6 μm.
It is good to be in the range.

As the protective layer (varnish, ink), those used in the cold transfer method are similarly used.

The lamination of the laminating film to the metal body of the can is carried out under such conditions that the hologram in the film is maintained without being thermally deformed and that the adhesive is securely bonded to the metal substrate by heat. Will be Generally, it is preferable to perform the thermal bonding at a temperature lower than the melting point of the film substrate and in the range of 130 to 170 ° C.

(3) Application of Shrink Film: The transfer of the hologram to the can body can also be performed by using a heat shrink film (label) on which a hologram is formed. The application of the shrink film (label) can be performed prior to the processing of the three-dimensional uneven portion, or can be performed after the processing of the three-dimensional uneven portion.

FIG. 1 shows a process of applying a shrink film.
1 shows a method of applying the film prior to the processing of the three-dimensional unevenness, and a method of applying the film after processing the three-dimensional unevenness. The method includes a can forming step (pre-process), a transferring step, a heat shrinking step, and a processing step. The method includes a can forming step, a processing step, a transferring step, and a heat shrinking step. Forming process to can body and 3
The processing steps of the three-dimensional uneven portion are the same as those of the cold transfer method described above. In the transfer step, a film on which a hologram is formed is mounted on a can body before the formation of the three-dimensional uneven portion or on a can body after the formation of the three-dimensional uneven portion using a labeler known per se. Labelers are widely used to attach labels printed on the outer surface of plastic bottles, and use this device to attach printed images to curved bottle outer surfaces without causing image disturbance. be able to. In the heat shrinking step, the shrink film mounted on the outer periphery of the can body is thermally shrunk to be in close contact with the outer surface of the can body.

In FIG. 12 for describing transfer and heat shrinkage more specifically, a shrink film 40 is composed of a heat shrinkable hologram forming layer 31 and a protective layer (varnish, ink) 32 on its surface. . The shrink film 40 has a dimension slightly larger than the outer dimension of the can body substrate 10 and is mounted on the outside of the can body substrate 10.
Then, it is heated and tightly fixed to the outer surface of the can body substrate 10.

Hologram forming layer 4 of shrink film
As 0, a plastic film having a relief hologram formed by embossing is used. As the hologram-attached plastic film, the same one as used in the film lamination method is used,
In order to impart heat shrinkability, it is essential to have internal strain, and it is uniaxially stretched or biaxially stretched,
It is important that it is not heat set.

As the protective layer 42 provided on the hologram forming layer, the same protective layer as used in the film laminating method is used.

The heat shrinkage of the shrink film is preferably in the range of 50 to 80%, particularly 60 to 70%, in the uniaxial direction. If the shrinkage exceeds the above range, the hologram is not faithfully reproduced on the final can body, and the decoration effect tends to be unsatisfactory. On the other hand, if the shrinkage ratio is lower than the above range, the adhesion to the can becomes insufficient, which is not preferable.

The heat shrinkage of the shrink film can be performed with good workability by heating the film with hot air. The heating temperature of the film is lower than the melting point of the base film and is equal to or higher than its glass transition point. Depending on the type of the resin, it is generally preferable to select an appropriate temperature from 80 to 200 ° C. .

(4) Transfer foil (hot stamp) method: The hologram can be transferred to the can body by hot stamping using a transfer foil on which a hologram is formed. The application of the hologram by the hot stamp is preferably performed prior to the processing of the three-dimensional uneven portion.

In FIG. 13 showing the steps of the transfer foil (hot stamp) method, this method includes a can forming step (previous step),
It consists of a transfer step and a processing step. The process of forming the can body and the process of processing the three-dimensional uneven portion are the same as those of the cold transfer method described above. In the transfer step, the foil on which the hologram is formed is pressure-bonded to the can body before the formation of the three-dimensional uneven portion by heating and pressing using a hot stamping machine known per se.

Referring to FIG. 14 for describing the transfer foil (hot stamp) method more specifically, the transfer foil 50 used includes a hologram forming layer 51, an adhesive layer 52 formed on one surface thereof, and a hologram forming layer. It comprises a protective layer (varnish, ink) 53 formed on the other surface of the layer, a release layer 54 provided on the surface of the protective layer, and a base film 55 provided on the uppermost surface via the release layer. ing.

As the hologram forming layer 51, the one used in the film laminating method is similarly used. In particular, the one in which a metal film such as aluminum or tin is formed on a fine uneven surface is suitably used. As the adhesive layer and the protective layer, those used in the film lamination method are similarly used.

As the base film, a film known per se, for example, polyolefin such as high-density polyethylene, polypropylene, poly-4-methyl-1-pentene; nylon 6, nylon 6-6, nylon 6-10,
A heat-resistant thermoplastic resin film or paper such as polyamide such as nylon 11, thermoplastic polyester such as polyethylene terephthalate, polybutylene terephthalate, or polyethylene naphthalate, polycarbonate, polyphenylene oxide, or polysulfone is used. It is preferable that a release treatment is performed by coating with a silicone resin, an alkyd resin, a melamine resin, stearyl acrylate, a chromium chloride salt of stearic acid, stearylamide, or the like.

As the release layer, for example, a material capable of being peelably bonded, for example, various waxes, polyethylene wax,
Oxidized polyethylene wax, hot melt (ethylene-
A material in which a wax or a tackifier is blended with a vinyl acetate copolymer) is used. In addition, a release agent known per se such as a silicone resin, an alkyd resin, a melamine resin, stearyl acrylate, a chromium chloride salt of stearic acid, and stearyl amide may be combined with a known adhesive primer (which may be a protective layer). Used in combination. These release agents are used after being applied to a base film.

The transfer of the transfer foil 50 to the metal body 10 of the can is performed under the condition that the hologram in the transfer foil is held without being thermally deformed and that the adhesive is securely bonded to the metal base by the adhesive. Done in Generally, the melting point is lower than the melting point of the film substrate of the hologram forming layer and 180 to 200 ° C.
It is preferable to perform the thermal bonding at a temperature in the range described above. After thermal bonding
By peeling the base film 55 at the peeling layer 54, the hologram forming layer 51 provided with the protective layer 53 is adhered and fixed on the can body metal base 10 by the adhesive layer 52.

[0063]

The present invention will be further described with reference to the following examples, but the present invention is not limited to these examples.

1. Example of cold transfer method A hologram is cold-transferred to the entire side wall surface of an aluminum DI can using a roll transfer machine, partial printing is applied to the can body wall, and a finish varnish is applied to the entire circumference of the can body and baked and dried. After that, diamond cut processing was performed with a panel former.
The roll transfer machine has a groove pitch of about 1 μm and a depth of about 0.1 mm on a cylindrical tool steel surface having a diameter of about 130 mm and a width of about 66 mm.
A nickel electroformed plate to which a relief (concavo-convex) type hologram of about 0.2 μm is added is attached and this is engaged with the surface of an aluminum DI can attached to a mandrel, and the linear load applied at this time is about 20 kgf. / Mm. Since the mandrel is cantilevered in this machine, transfer was performed with a toe-in angle of about 0.1 ° to cancel the deflection. The processing was performed at normal temperature (about 25 ° C.). Next, a printing of a thickness of 1 to 5 μm is applied to about 1/2 of the entire circumference of the can body wall of the can having the relief (concavo-convex) hologram.
Further, a transparent finish varnish was applied to the entire circumference of the can body. Although the hologram in the printed portion became almost invisible, the hologram in the non-printed portion showed a sufficient rainbow hologram although the gloss of the aluminum surface serving as the reflective layer was somewhat lost through the finishing varnish layer. The baking and drying were performed using a gas oven at a temperature of about 230 ° C. for 70 seconds. Finally, a diamond cut was performed using a panel former to produce a three-dimensional hologram can.

2. Example of film lamination A thermoplastic resin film (PET, PP, PEN, etc.) provided with a hologram using a film laminator is TUL-coated.
After adhering to the entire circumference of the C can and heat setting, it was subjected to diamond cutting with a panel former. The film was made of a thermoplastic resin film having a thickness of about 9 to 12 μm, which was formed on the surface with aluminum cross-sections by forming a crossroad lattice-like unevenness (the film was formed between the uneven surface of the hologram and the aluminum-deposited layer). Those provided with a general ink layer can also be used). As the adhesive, a thermosetting polyester or epoxy resin was applied to the back surface of the film (the surface of the aluminum-deposited surface) with a thickness of about 3 to 6 μm. The applied transparent film can be laminated as it is.
At this time, a film having a partial ink layer can also be used. The surface of the can attached to a mandrel having a film attached to a roll of a laminator was heated to about 130 to 170 ° C. by a high-frequency heating device and a heating device of the mandrel itself, and was adhered with a linear load of about 5 kgf / mm. Next, using a research oven, heat setting was performed at a temperature of about 210 ° C. for 3 minutes in order to completely cure the adhesive. Finally, a diamond cut was performed using a panel former to produce a three-dimensional hologram can.

3. Shrink Film Example A shrink film was attached to an aluminum DI can, the film was shrunk in an electric oven, and then subjected to a diamond cut process with a panel former. The shrink film is a uniaxially stretched film (P) having a relief type hologram and having a thickness of about 60 μm and having a maximum shrink ratio of about 70% and having high transparency.
S, or PET). The film shrinks by heating the can temperature to 75-85 ° C and then mounting it on an aluminum DI can, with an oven temperature of 100-150 ° C and a holding time of 10-
The test was performed for 20 seconds. Finally, a diamond cut was performed using a panel former to produce a three-dimensional hologram can. At this time, the concave and convex shape of the hologram changed due to thermal shrinkage, and a rainbow-like interference fringe as obtained by cold transfer or film lamination was not obtained.

4. Example of transfer foil (hot stamp) A binder (UV ink) is printed on a part of the TULC can body by silk screen printing, and the necessary adhesion and surface smoothness are imparted to the binder by a printing device. After the foil was transferred by a hot stamping machine, a diamond cut was performed by a panel former. The hologram foil has a cross-section grid-like unevenness on the surface, and is aluminum-deposited on the back side with a thickness of about 24μ.
m. The UV binder heating and UV irradiation conditions for the three steps in the baking apparatus are near infrared heating 105 ± 5.
C., UV irradiation from 1500 to 2700 mJ / cm @ 2, far-infrared heating at 85 ± 5 ° C., and the transfer conditions of a hot stamping machine were as follows: transfer speed: 80 mm / sec, transfer roll temperature: 190 ± 5 ° C., can temperature: 85 ± 5 ° C. Finally, a diamond cut was performed using a panel former to produce a three-dimensional hologram can.

[0068]

According to the present invention, three-dimensional irregularities are formed on at least a part of the can body, and a hologram is exposed on the surface of the irregularities. In addition to feeling, a multifaceted and multidimensional interference color image can be formed, and an excellent decorative effect can be imparted to the can body.

[Brief description of the drawings]

FIG. 1 is a side view for explaining a configuration of a circumferential polyhedral wall can which is a typical example of a can with a three-dimensional hologram.

FIG. 2 is a side sectional view of the can of FIG.

FIG. 3 is a side view (A) and a sectional view (B) of a circumferential polyhedral wall seamless can.

FIG. 4 is a side view (A) and a cross-sectional view (B) of an embossed three-piece can.

FIG. 5 is a side view (A) and a cross-sectional view (B) of a bead-formed three-piece can.

FIG. 6 is a process chart of a cold transfer method used in the present invention.

FIG. 7 is an explanatory diagram for explaining hologram transfer in a cold transfer method.

FIGS. 8A and 8B are a front view (A) and a cross-sectional view (B) of a structural unit surface of the circumferential polyhedral wall.

FIG. 9 is a process chart of a film lamination method used in the present invention.

FIG. 10 is an explanatory diagram for explaining hologram transfer in a film lamination method.

FIG. 11 is a process chart of a shrink film application method used in the present invention.

FIG. 12 is an explanatory diagram of hologram transfer in a shrink film application method.

FIG. 13 is a process chart of a transfer foil method used in the present invention.

FIG. 14 is an explanatory diagram of hologram transfer in a transfer foil method.

Claims (9)

[Claims] 1. A can with a three-dimensional hologram, wherein a three-dimensional uneven portion is formed on at least a part of a can body, and a hologram is exposed on the surface of the uneven portion. 2. The can with a three-dimensional hologram according to claim 1, wherein the three-dimensional uneven portion comprises a peripheral polyhedral wall. 3. The peripheral polyhedral wall has a constituent unit surface, a boundary ridge line where the constituent unit surfaces are in contact with each other, and a crossing portion where the boundary ridge lines cross each other, wherein the boundary ridge line and the crossing portion are relatively compared with the constituent unit surface. The component unit surface has a smoothly recessed portion between the opposing intersections, and the container axial direction array adjacent to the component unit surface in the circumferential direction forms a phase difference. 3. The can with a three-dimensional hologram according to claim 2, wherein: 4. The can with a three-dimensional hologram according to claim 1, wherein the three-dimensional uneven portion comprises an embossed portion. 5. The can with a three-dimensional hologram according to claim 1, wherein the three-dimensional concavo-convex part comprises a bead processing part. 6. The method according to claim 1, wherein the hologram is formed on the metal body of the can or the metal material for forming the can body directly by forming the hologram prior to the formation of the three-dimensional uneven portion. The can with a three-dimensional hologram described in the crab. 7. The hologram is a hologram processed film or label laminated or attached to a can body or a metal material for forming a can body prior to the formation of the three-dimensional uneven portion. 3 described in any of
Can with a dimensional hologram. 8. A can with a three-dimensional hologram, wherein the hologram is formed by hologram printing applied to the can body or a metal material for forming the can body prior to the formation of the three-dimensional uneven portion. 9. A can with a three-dimensional hologram, wherein the hologram is formed by shrinking a film which has been subjected to hologram processing after formation of a three-dimensional uneven portion by shrinkage.