JP2005007653A - In-mold label container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an in-mold label container being a cup-shaped container manufactured by in-mold labelling type injection molding and excellent in various properties as the container, especially excellent in design effect and high grade feeling. <P>SOLUTION: For example, the in-mold label container 100 is formed from a peripheral wall 11, which has a flange part 12 provided to the outer periphery of the upper part thereof and has a leg part 13 provided to the lower part thereof, and the bottom part 14 provided on the leg part 13. A label 16, wherein a polarizing printing layer due to ink containing an iris color pigment having a dichroic effect is provided at least on the back of a transparent base material film in combination with a printing layer of a character, a pattern or the like due to usual color ink and a thermal adhesive resin layer is further laminated thereon, is monolithically molded on the outer peripheral surface of the peripheral wall 11 of the container by in-mold injection molding. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an in-mold label container. More specifically, the present invention relates to a cup-shaped container produced by in-mold labeling injection molding, and has excellent performance as a container and particularly excellent in design. About.
[0002]
[Prior art]
Conventionally, as a cup-shaped container for sealing and packaging various beverages, dessert foods and the like, a cup-shaped container by plastic injection molding is often used because the container has good shape retention and excellent strength.
Such cup-shaped containers need to be printed with display items and patterns related to the contents. Usually, (1) a dedicated container corresponding to the size and shape of the cup-shaped container is provided on the outer peripheral surface of the container peripheral wall. A method of printing a printer and directly printing it, or (2) a method of sticking a printed label using a labeling device has been adopted.
However, with the direct printing method (1), there is no problem if the print design is relatively simple, such as an illustration, and the number of colors is small, but in the case of multicolor printing such as a photo, the printing registration accuracy There was a problem that a beautiful printed matter could not be obtained.
In addition, in the method of sticking the printed label of (2), there is no problem in printing, but in particular, when the container is a tapered cup-shaped container, the sticking position is likely to be shifted and the sticking is performed. There was a problem that the sense of unity between the label and the container was poor, and the sense of luxury was lacking.
[0003]
As a method for solving such a problem, an in-mold label molding method in which a printed label is inserted into an injection molding die, resin is injected, and the printed label is integrated with the outer peripheral surface of the container peripheral wall. Is to be done.
In an in-mold label container produced by such a molding method, since a decorative process such as printing can be performed on a base film of a flat label, multi-color printing or the like can be printed with register accuracy, and Since the label can be formed integrally with the outer peripheral surface of a peripheral wall such as a cup-shaped container, the cup-shaped container is superior in design and superior to a container in which the label is attached with an adhesive. Can be manufactured.
Furthermore, in such in-mold label containers, depending on the contents to be filled, in order to improve the storage stability, gas barrier properties and ultraviolet ray blocking properties are also imparted. For example, a laminated sheet of labels A gas barrier layer or an ultraviolet blocking layer is added to the intermediate layer of the container, and the label is integrally formed on the outer peripheral surface of the container peripheral wall, or the outer peripheral surface of the container peripheral wall and the inner surface or outer surface of the container bottom surface. There is an in-mold label container with improved properties and ultraviolet blocking properties (see, for example, Patent Document 1).
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 11-105067 (pages 2 to 5, FIG. 1)
[0005]
[Problems to be solved by the invention]
However, even in the in-mold label container as described above, for example, regarding the design properties, a color photo-like pattern or the like is printed on the label with a high precision and beautifully finished. Even if the design can be improved by adding changes, there is a problem that it is easy to become rutted by itself and lacks freshness and fun as a container design.
[0006]
The present invention has been made to solve such problems, and the object of the present invention is to provide strength and heat resistance as a cup-shaped container produced by in-mold labeling injection molding. In addition to its excellent performance such as gas barrier properties, it is possible to add freshness and fun to the print design in terms of design, and in-mold label containers that are particularly superior in design as well as performance. It is to provide with good productivity.
[0007]
[Means for Solving the Problems]
The above problems can be solved by the following present invention.
That is, the invention described in claim 1 is a cup-shaped container manufactured by in-mold labeling type injection molding, and is usually disposed on the outer peripheral surface of the peripheral wall of the cup-shaped container, and at least on the back surface of the transparent base film. A layer in which a printing layer of characters, patterns, etc., with a color ink and a polarizing printing layer with an ink containing an iris pigment having a dichroic effect is provided, and a thermal adhesive resin layer is further provided thereon It consists of the in-mold label container characterized by the label produced with the sheet | seat being in-mold-molded.
[0008]
In the present invention, an iris pigment having a dichroic effect to be contained in the ink of the polarizing printing layer provided in combination with the printing layer of the character, picture, etc. of the label will be described.
The iris pigment belongs to the pearl luster pigment, and the pearl luster pigment itself generally has a flake shape, and when it is arranged in layers, it expresses elegant pearl luster due to multiple reflection of light. It is.
Such pearlescent pigments include natural pearl essence [guanine, hypoxanthine], basic lead carbonate [3PbCO ₃ ・ 2Pb (OH) ₂ ], Bismuth oxychloride [BiOCl], titanium dioxide-coated mica [TiO ₂ / K ₂ O · 3Al ₂ O ₃ ・ 6SiO ₂ ・ 2H ₂ O], iron oxide-coated mica [Fe ₂ O ₃ / K ₂ O · 3Al ₂ O ₃ ・ 6SiO ₂ ・ 2H ₂ O] and the like, and is used in the fields of cosmetics, imitation pearls, plastics, printing inks, paints, and the like. As natural pearl essence is expensive, inorganic pigments, especially titanium dioxide-coated mica and iron oxide-coated mica are often used in printing inks.
[0009]
By adjusting the thickness of the pigment flakes, such pearlescent pigments can be used to obtain iris pigments colored with interference colors. In titanium dioxide-coated mica and iron oxide-coated mica, By adjusting the film thickness of iron oxide, an iris pigment colored with an interference color can be obtained.
For example, in the case of coating titanium dioxide, by increasing the film thickness stepwise in the range of 60 nm to 160 nm, the color of the reflected light is changed to a specific iris color in the order of yellow, orange yellow, red, blue, green. An iris pigment with enhanced color can be obtained.
[0010]
Further, such an iris pigment has a dichroic effect in which, when a part of incident light is reflected and a part thereof is transmitted, the color of the transmitted light is complementary to the color of the reflected light. is doing. Therefore, it is necessary to consider the reflectivity of the background when using an ink containing an iris color pigment for printing design.
For example, when the background is white that is nearly totally reflective, the complementary color of the transmitted light is reflected back by the background again and is added to the color of the original reflected light, reducing the color effect. On the other hand, when the background is black, since the complementary color of the transmitted light is absorbed by the black color of the background, only the color of the original reflected light can be seen.
Therefore, by changing the color used for the background, in addition to the pearl luster, the visual effect by the iris color can be changed, and freshness and fun can be added to the design.
For example, in a beverage in-mold label container, if the content is close to black, such as coffee drinks, the part of the polarization printing layer with ink containing an iris color pigment other than the printing part of characters, designs, etc. with normal color ink Then, the visual effect that the appearance changes depending on the presence or absence of the contents can be obtained.
[0011]
In addition, the in-mold label container of the present invention is preferably a cup-shaped container having a flange part on the outer periphery of the upper part and a taper on the body part from the viewpoint of manufacturing and filling suitability of the contents. The shape of the part can be formed into a round cup-shaped container having a circular cross section, or a rectangular cup-shaped container having a quadrangular cross section or other polygonal cross section.
[0012]
The injection molding resin used for the in-mold label container of the present invention is not particularly limited as long as it is a resin that can be injection molded. For example, a polypropylene resin, a polyethylene resin, a polystyrene resin, a polyester resin, and the like are preferable. Among them, the content filled in the container and the one suitable for the use conditions such as the presence or absence of heat treatment after filling and sealing can be appropriately selected and used.
For example, when heat resistance such as hot filling, retorting after filling, sealing, or hot warmer heating is required, polypropylene resin is suitable, and the contents are milk, special milk, pasteurized goat milk, For partially skimmed milk, skimmed milk, processed milk, and cream, polyethylene and ethylene / 1-alkene copolymer resins can be used. For dessert foods, polypropylene resins and polyethylene resins can be used as well as polystyrene resins. On the other hand, when non-adsorptive properties such as flavor are required, a polyester resin can be preferably used.
[0013]
The in-mold label container of the present invention can obtain the following operational effects by adopting the configuration as described above.
That is, since the container body is formed in a cup shape by plastic injection molding, the shape retention is good and the performance such as strength is excellent.
And, on the outer peripheral surface of the peripheral wall of the cup-shaped container, at least the back surface of the transparent base film is printed with a printing layer such as characters and patterns with normal color ink, and with an ink containing an iris pigment having a dichroic effect. Since a label made of a laminated sheet provided with a polarizing printing layer and further provided with a heat-adhesive resin layer is molded in-mold, the label and the container are excellent in unity, and the label Is firmly bonded to the outer peripheral surface of the peripheral wall of the container by the heat-adhesive resin layer, and is excellent in appearance without fear of peeling off.
In addition, the label is provided with a polarizing printing layer made of ink containing an iris pigment having a dichroic effect in combination with a printing layer of characters, patterns, etc. with ordinary color ink on the back surface of the transparent base film. Therefore, it is possible to change the visual effect by appropriately selecting the background color of the polarizing printed layer, to add freshness and fun to the design, and to improve the design of the in-mold label container it can.
[0014]
The invention described in claim 2 is the in-mold label container according to claim 1, wherein the iris pigment is titanium dioxide or iron oxide-coated mica.
[0015]
By adopting such a configuration, in addition to the effects of the invention described in claim 1, titanium dioxide or iron oxide-coated mica can be produced at a relatively low cost, and in particular, titanium dioxide-coated mica has been described above. Thus, by adjusting the film thickness of titanium dioxide within a range of 60 nm to 160 nm, for example, an iris color pigment in which a specific color such as yellow, orange yellow, red, blue, or green is emphasized is reflected light. The design is diversified with rich colors.
[0016]
The invention described in claim 3 is the in-mold label container according to claim 1 or 2, wherein the laminated sheet of the label is further provided with a gas barrier layer.
[0017]
The gas barrier layer is provided to improve the storage stability of the contents filled in the container. The gas barrier layer may be transparent or opaque depending on the material. can do.
As the gas barrier layer having transparency, a film obtained by forming a film of a gas barrier resin such as ethylene-vinyl alcohol copolymer, MXD6 (polymetaxylylene adipamide), or a coating solution of polyvinylidene chloride is used as a transparent base. Polyvinylidene chloride coated film coated on a material film to form a coating layer, and inorganic oxide deposition by depositing inorganic oxide such as alumina, silica, zinc oxide, magnesium oxide, ITO on transparent substrate film A film or the like can be used.
As the opaque gas barrier layer, a metal foil such as aluminum or a metal vapor deposited film obtained by vapor depositing a metal such as aluminum on a base film can be used.
[0018]
Such a gas barrier layer is usually laminated on the intermediate layer of the laminated sheet of the label. Particularly when the opaque gas barrier layer is used, light shielding properties can be imparted in addition to the gas barrier properties. Although more preferable for storage stability, under the printing layer of characters, designs, etc. with ordinary color ink and under the polarizing printing layer with ink containing the above-mentioned iris color pigment so as not to hide the label design It is necessary to laminate between the innermost heat-adhesive resin layer. Furthermore, when the opaque gas barrier layer has light reflectivity, a light absorbing layer such as a black ink layer can be provided on the outer surface of the opaque gas barrier layer to improve the coloring effect of the polarized printing layer.
[0019]
By adopting the configuration as described above, in addition to the operational effects of the invention described in claim 1 or 2, gas is applied to the label formed in-mold on the outer peripheral surface of the peripheral wall having a large area among the outer surfaces of the cup-shaped container. Since the barrier property is imparted, the gas barrier property of the container can be improved efficiently from the viewpoint of production, and the preservability of the contents filled in the container can be improved.
In addition, in order to further improve the gas barrier properties of the container, it is possible to separately prepare a label for the bottom surface provided with a gas barrier layer not only on the outer peripheral surface of the container peripheral wall but also on the bottom surface of the container. Thereby, the gas barrier property can be further improved.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the in-mold label container of the present invention will be described below with reference to the drawings.
FIG. 1 is a schematic cross-sectional view showing the structure of an example of a label used in the in-mold label container of the present invention, and is a diagram for explaining the reflection and transmission (absorption) state of incident light incident on the polarization printing layer of the label It is.
FIG. 2 is a longitudinal sectional view showing the configuration of an embodiment of the in-mold label container of the present invention.
FIG. 3 is a developed view for explaining an example of the shape of a label to be in-mold formed on the outer peripheral surface of the peripheral wall of the in-mold label container of the present invention.
FIG. 4 is a rear view of the in-mold label container shown in FIG. 2 and is a diagram for explaining a gap formed between both side end portions of a label integrally formed on the outer peripheral surface of the peripheral wall of the container. .
In addition, this invention is not limited to these drawings, unless the summary is exceeded.
[0021]
The label 16 shown in FIG. 1 uses a transparent base film 1 on the outer side (upper side in the figure), and has a printed layer 2 such as characters and patterns with normal color ink on the back side (lower side in the figure). A polarizing printing layer 3 made of an ink containing an iris pigment 3a having a dichroic effect is provided so as to cover the printing layer 2 on the back surface, and a thermal adhesive resin layer 4 is further provided on the back surface (innermost layer). It is constructed by stacking.
In addition, a white ink layer can be provided on the back surface of the printing layer 2 in accordance with the pattern, so that the concealability is increased and characters, pictures, etc. of the printing layer 2 can be clearly seen. In addition, a layer that absorbs transmitted light, such as a black ink layer, can be provided on at least a portion of the back surface of the polarizing print layer 3 excluding the back surface of the print layer 2. Because it can absorb the complementary color of the transmitted light that has passed through the iris pigment 3a, the unique color of the reflected light of the iris pigment 3a can be seen along with the pearl luster, adding freshness and fun to the print design. can do.
[0022]
In the configuration of the label 16, the outermost transparent base film 1 is not particularly limited as long as it is a transparent film having strength, heat resistance, and the like. For example, a biaxially stretched polypropylene film (hereinafter referred to as an OPP film). A biaxially stretched polyethylene terephthalate film (hereinafter sometimes referred to as an OPET film), a biaxially stretched nylon film (hereinafter sometimes referred to as an ON film), and the like can be used. .
[0023]
In addition, the innermost heat-adhesive resin layer 4 is provided so that when the label 16 is in-mold injection-molded on the outer peripheral surface of the container, it is thermally bonded to the injection-molded resin of the container. Corresponding to the molding resin, a heat-adhesive resin that can be heat-adhered well with the resin can be appropriately selected and used.
The injection molding resin for the container is selected according to the contents to be filled in the container, the filling of the contents, the heat treatment after sealing, and other usage conditions, but usually a polypropylene resin, a polyethylene resin Resins, polystyrene-based resins, polyester-based resins, and the like are used, and heat-bondable resins can be used for the heat-adhesive resin layer 4 in accordance with each.
ラ ベ ル The label itself should be free from curling as much as possible from the viewpoint of improving the productivity and yield of in-mold molding. It is more preferable that the film is formed so that both sides have a symmetrical layer structure.
[0024]
As an example of a configuration conforming to such a gist, in the configuration of the label 16, for example, an OPP film is used for the transparent base film 1 which is the outermost layer, and gravure printing is used on the back surface thereof. An OPP film having a heat sealing property as a thermal adhesive resin layer 4 on the back surface (innermost layer) is provided with a printing layer 2 such as a pattern and a polarizing printing layer 3 made of ink containing an iris pigment 3a. Hereinafter, it may be described as an HSOPP film) by a dry lamination method or the like through an adhesive (not shown).
For the heat-adhesive resin layer 4, an unstretched film such as a polypropylene resin, a polyethylene resin, a polystyrene resin, or a polyester resin can be used corresponding to the injection molding resin. In order to prevent curling by making both sides close to symmetry, it is possible to use an OPP film having heat sealing properties for the innermost thermal adhesive resin layer 4 corresponding to the outermost OPP film. Even more preferred.
[0025]
The OPP film having the heat-sealability is originally provided with a heat-sealable resin layer on one or both sides of the OPP film to enable bag-making by heat-seal of the OPP film. There are resins using various resins such as polypropylene resins, ethylene / vinyl acetate copolymer resins, acrylic resins, etc. Depending on the selection of these heat-sealable resins, injection molding resins such as polypropylene resins and polyethylene resins can be used. Any of a polystyrene-based resin and a polyester-based resin can be favorably thermally bonded to the outer peripheral surface of the container by in-mold molding.
[0026]
As a method of laminating such an HSOPP film as the heat-adhesive resin layer 4 on the innermost layer of the label, for example, it can be bonded by an extrusion lamination method. In view of this, it is preferable to have excellent heat resistance and adhesive strength. From this point of view, it is more preferable to use a dry lamination method in which a known dry laminating adhesive such as a two-component curable polyurethane adhesive can be used.
[0027]
In addition, when the gas barrier property is imparted to the label 16, in the configuration of FIG. 1, the gas barrier film or gas described above is interposed between the polarizing printing layer 3 and the thermal adhesive resin layer 4 via an adhesive. By laminating a film provided with a barrier layer by a dry lamination method, gas barrier properties can be imparted without problems of adhesive strength and heat resistance, and without curling.
[0028]
In addition, as shown in FIG. 1, the light incident on the label 16 from the outside is transmitted through the transparent base film 1, and the printed layer 2 of characters, patterns, etc., or a dichroic effect using ordinary color inks. It reaches the polarizing printing layer 3 by the ink containing the iris pigment 3a. Incident light that has reached the printing layer 2 such as characters and designs using ordinary color inks is mainly reflected or absorbed by the printing layer 2 so that the characters, designs, etc. can be seen in the same manner as ordinary printing designs.
On the other hand, a part of incident light is reflected and partly transmitted by the iris color pigment 3a by the light incident on the polarization printing layer 3 by the ink containing the iris color pigment 3a having the dichroic effect. The transmitted light that has been transmitted is absorbed by the thermoadhesive resin layer 4 underneath, the injection molding resin when the label 16 is in-molded into the container, and the contents filled in the container, and the complementary color of the transmitted light. Is erased. Therefore, since the peculiar color by the reflected light of the iris pigment 3a can be seen with pearl luster from the outside, freshness and fun can be added to the print design, and the design can be improved.
[0029]
Next, the in-mold label container 100 shown in FIG. 2 is formed in a tapered round cup-shaped container, and has a substantially cylindrical peripheral wall 11 having a leg portion 13 at a lower portion, and legs of the peripheral wall 11. 1 has a bottom portion 14 provided on the upper inner side of the portion 13 and a flange portion 12 provided on the upper outer periphery of the peripheral wall 11, and the peripheral wall 11 is located on the outer periphery thereof, for example, in the laminated configuration shown in FIG. 3 is formed of the label 16 having the shape shown in FIG. 3 and the injection molding resin 15 injected inside thereof, and the inner peripheral surface below the peripheral wall 11 has a convex shape on the inner side. Reinforcing ribs 18 that also serve as an injection molding resin 15 are provided.
[0030]
Further, for reinforcement, an arcuate portion 17a made of injection-molded resin 15 is provided at the corner portion between the lower surface of the flange portion 12 and the peripheral wall 11, and similarly, the upper surface of the bottom portion 14 and the peripheral wall 11 are provided. And the corners of the lower surface of the bottom part 14 and the leg part 13 are respectively provided with arcuate fleshing parts 17b, 17c by injection molding resin 15 over the entire circumference.
The arcs of the arc-shaped fleshing portions 17a, 17b and 17c are all arc-shaped with a radius (r) of 0.3 to 1.5 mm, which has a reinforcing effect and is deformed due to resin shrinkage after molding. It is preferable at the point which can prevent.
When the radius (r) of the arc is less than 0.3 mm, a sufficient reinforcing effect cannot be obtained, and when the radius (r) of the arc exceeds 1.5 mm, the molded resin Deformation due to shrinkage becomes large. For example, the flatness of the upper surface of the flange portion 12 is deteriorated, and suitability for heat sealing such as a seal lid is impaired.
[0031]
The resin used for injection molding of the in-mold label container of the present invention is not particularly limited, and as described above, for example, various resins such as a polypropylene resin and a polyethylene resin, as well as a polystyrene resin and a polyester resin. Can be used.
The above-mentioned polypropylene resin has rigidity and heat resistance, is excellent in food safety, and can be modified for various contents and use conditions because impact resistance at low temperature can be modified by copolymerization. Can do.
As the polypropylene resin, in addition to a polymer of propylene alone, for example, a random copolymer of propylene and ethylene or ethylene and butene-1, a block copolymer of propylene-ethylene obtained by copolymerizing ethylene in a block shape, Can use a polypropylene-based blend resin obtained by blending polypropylene with another polymer, an elastomer, or the like.
If necessary, a transparent nucleating agent such as sorbitol can be added to such a polypropylene resin to improve transparency.
[0032]
As the polyethylene-based resin, high-density polyethylene is mainly used from the viewpoint of rigidity and heat resistance, but medium-density to low-density polyethylene can also be used depending on applications and use conditions. In particular, when the content is milk, special milk, pasteurized goat milk, partially skimmed milk, skimmed milk, processed milk, or cream, the regulations of the milk ministerial ordinance (Ministry of Health, Labor and Welfare Ordinance No. 164) make polyethylene, ethylene, Use of a 1-alkene copolymer resin is essential.
In high-density polyethylene, a copolymer of ethylene, propylene, and butene-1 can be used in addition to a polymer of ethylene alone. In addition, in the case of medium density to low density polyethylene, a copolymer of ethylene and a higher α-olefin such as butene-1,4-methylpentene-1, hexene-1, octene-1 is used in addition to a polymer of ethylene alone. can do.
[0033]
By using the injection molding resin as described above, for example, as a general use condition, and when heat resistance is necessary when hot filling or retort processing or hot warmer heating is performed, a polypropylene-based resin is used. By using a resin, especially when the content is the milk, special milk, pasteurized goat milk, partially skimmed milk, skimmed milk, processed milk, cream, by using polyethylene, ethylene / 1-alkene copolymer resin In addition to the food hygiene aspect, the in-mold label container 100 that can be used more safely in terms of performance such as rigidity, heat resistance and content resistance can be reliably provided.
In terms of moldability, the MFR (melt flow rate) (based on JIS K7210) of the injection-molded resin is preferably in the range of 10 to 50 (g / 10 minutes).
An MFR of less than 10 is not preferred because the thermal fluidity is low and the molding suitability is poor, and so-called short-circuiting is likely to occur during injection molding. Moreover, when MFR exceeds 50, since heat fluidity is high and it becomes easy to generate | occur | produce a burr | flash etc. in a flange part etc. in the case of injection molding, it is unpreferable.
[0034]
Next, the shape of the label 16 to be in-mold formed on the outer peripheral surface of the peripheral wall 11 of the container will be described with reference to FIG.
As shown in FIG. 3, the label 16 has a fan shape, and the lower corners of the edge portions on both sides of the label 16 are notched as notches 19a and 19b. The shape of the notches 19a 1 and 19b 2 may be a shape in which the corners of the label 16 are rounded, or a shape that is an oblique straight line.
In the fan-shaped region of the label 16, for example, printing portions 21 of characters, patterns and the like using normal color ink are provided in a pattern, and at least the other portions are rainbows having the dichroic effect. There is provided a printing unit 22 made of ink containing a chromatic pigment.
[0035]
Further, as shown in FIG. 2, the length of the label 16 in the height direction slightly protrudes from the flange portion 12 above the container peripheral wall 11, and is approximately the middle portion of the leg portion 13 below. Preferably, the length of the label 16 in the container circumferential direction is such that, as shown in FIG. 4, a gap 20 having a width of about 0.6 to 1.5 mm is provided between both end portions to be abutted. It is preferable that the length is as long as it occurs.
[0036]
By forming the label 16 in this way, the label 16 is inserted into a predetermined position of the female mold of the injection mold and fixed by vacuum suction. After closing the mold, the injection molding resin is injected from the gate at the center of the bottom. At that time, the injection molding resin can be injected smoothly without causing any creases or wrinkles in the abutting portion at the bottom of the label, and without causing wrinkles or overlapping portions in the abutting portion of the peripheral wall of the label. The in-mold label container 100 having a good quality and appearance can be manufactured with good yield by easy integral molding.
[0037]
In addition, the surface design of the label 16 is formed by providing a printing unit 22 made of ink containing an iris pigment having a dichroic effect in combination with a printing unit 21 made of characters, patterns, etc., using ordinary color inks. In addition to beautiful color images with color inks, printing that combines pearly luster with ink containing an iris pigment that has a dichroic effect around it and iris colors expressed by light interference And can add freshness and fun to the design of the label 16, and add freshness and fun to the design of the cup-shaped container produced by in-molding the label 16, The design can be further improved.
[0038]
【Example】
Hereinafter, the present invention will be described more specifically with reference to examples.
(Example 1)
A round cup-shaped in-mold label container having the configuration shown in FIG. 2 was produced with the following materials and dimensions to obtain an in-mold label container of Example 1.
(A) Injection molding resin 15: Propylene-ethylene random copolymer, provided that MFR was 22 (g / 10 minutes).
(B) Laminate structure of label 16: (Outside) OPP film (thickness 40 μm) Ink containing an iris color pigment having a dichroic effect such as a multicolor printing layer of characters, patterns, etc. with normal color ink Solid polarization printing layer / adhesive layer / HSOPP film (thickness 30 μm)
The adhesive layer is bonded by a dry lamination method using a two-component curable polyurethane adhesive.
The shape of the label 16 is a fan shape with the notches 19a and 19b provided at the lower corners of the side edge portions as described in the developed view of FIG. As shown in FIG. 4, the gap portion 20 has a length of about 1.0 mm between the end portions on both sides.
(C) Dimensions of container: outer diameter 71 mmφ of flange 12, outer diameter 63 mmφ of lower opening of flange 12, outer diameter 49 mmφ of bottom 14, total height 109.7 mm
The thickness of the flange 12 is 1.0 mm, the thickness of the peripheral wall 11 is 0.7 mm, the thickness of the bottom 14 is 1.0 mm, and the thickness of the leg 13 is 0.9 mm.
Then, the arcuate portion 17a at the corner portion between the lower surface of the flange portion 12 and the peripheral wall 11 is an arc having a radius (r) = 0.3 mm, and the corner portion between the upper surface of the bottom portion 14 and the peripheral wall 11 and the lower surface of the bottom portion 14. Each of the arcuate portions 17b, 17c at the corners between the leg portion 13 and the leg portion 13 is an arc having a radius (r) = 0.5 mm.
The full capacity of this container is 250 ml.
[0039]
(Example 2)
In the configuration of the in-mold label container of Example 1, a vapor deposition film in which an alumina vapor deposition layer (thickness 300 mm) is provided on a transparent OPET film (thickness 12 μm) as a gas barrier layer in the laminated configuration of the label 16 is dichroic. Examples are all formed in the same manner as in Example 1 except that additional layers are additionally laminated via an adhesive layer between the solid polarized printing layer and the HSOPP film with an ink containing an effective iris pigment. 2 in-mold label containers were prepared.
Laminate structure of the label 16: (Outside) OPP film (thickness 40 μm) ・ Textual multicolor printing layer such as characters and patterns with normal color ink / Solid with ink containing iris pigment with dichroic effect Polarized printing layer / adhesive layer / alumina vapor deposition layer (thickness 300 mm) / OPET film (thickness 12 μm) / adhesive layer / HSOPP film (thickness 30 μm)
Also in this case, each adhesive layer is bonded by a dry lamination method using a two-component curable polyurethane adhesive.
[0040]
(Comparative Example 1)
In the configuration of the in-mold label container of Example 1, all of Example 1 except that the solid polarization printing layer with ink containing an iris pigment having a dichroic effect was removed from the laminated configuration of the label 16. Thus, an in-mold label container of Comparative Example 1 was produced.
Laminate structure of label 16: (Outside) OPP film (thickness 40 μm) ・ Multicolor printing layer / adhesive layer / HSOPP film (thickness 30 μm) of patterns such as letters and patterns with normal color ink
[0041]
[Evaluation]
Regarding the in-mold label containers of Examples 1 and 2 and Comparative Example 1 produced as described above, (1) moldability at the time of in-mold injection molding of the label, (2) designability of the molded cup-shaped container, 3) As a result of comparative evaluation of the gas barrier properties of the molded cup-shaped container, (1) the moldability at the time of in-mold injection molding of the label is the same as that of each of the in-mold label containers of Examples 1 and 2 and Comparative Example 1. Since the OPP film or HSOPP film is laminated on the outside and inside of the label, the both sides of the label are formed of a film that approximates thermal properties such as heat shrinkability, and has a layer structure close to symmetry. As shown in the developed view shown in FIG. 3, the cut-out portions 19a and 19b are formed at the corners below both side edge portions as shown in the development view shown in FIG. In addition, the length in the circumferential direction of the container is formed so that a gap of about 1.0 mm in width is formed between both end portions that are abutted at the time of molding. Alternatively, it was possible to form smoothly without forming an overlapping portion, and the moldability was good.
[0042]
(2) Regarding the design properties of the molded cup-shaped container, Examples 1 and 2 in-mold label containers are the outermost OPP film (thickness 40 μm) of the label 16 formed integrally on the outer peripheral surface of the peripheral wall. Since the back is provided with a solid polarization printing layer with ink containing an iris pigment having a dichroic effect in combination with a pattern-like multicolor printing layer such as characters and patterns with normal color ink, In addition to beautiful color images such as letters and designs with normal color ink, pearly luster with ink containing iris pigment with dichroic effect around it and iris color expressed by light interference The combined printing section was formed, the design of the label 16 was added freshness and elegance, and the design of the in-mold label container was further improved.
In contrast, in the in-mold label container of Comparative Example 1, the label design is formed only by a pattern-like multicolor printing layer such as characters and designs using ordinary color inks, and is solid with ink containing the iris color pigment. The polarizing print layer is not provided, so compared to the in-mold label containers of Examples 1 and 2, there is no freshness or luxury even though the color image is beautiful, and as a design property of the in-mold label container Was relatively inferior.
[0043]
And (3) About the gas barrier property of the shape | molded cup-shaped container, about each in-mold label container of Examples 1, 2, and the comparative example 1, container is used using the oxygen permeability measuring apparatus OXTRAN made from MOCON. The oxygen permeability per ml (ml / piece · day · 0.1MPa) was measured by purging for 3 days at a temperature of 23 ° C, an outside relative humidity of 45%, and an inside relative humidity of 90%. The containers of Example 1 and Comparative Example 1 in which no gas barrier layer was provided were 1.5 ml / piece · day · 0.1 MPa, respectively, whereas an alumina vapor deposition layer (thickness of 300 mm) was used as a gas barrier layer on the label. ) Is 0.15 ml / piece · day · 0.1 MPa. By providing a gas barrier layer only on the peripheral wall surface of the container, the gas barrier is greatly increased. It was confirmed that the property can be improved.
[0044]
【The invention's effect】
As described above in detail, according to the present invention, it is a cup-shaped container produced by in-mold labeling injection molding, and generally has the required molding suitability, container strength, and heat resistance. In addition to excellent performance such as gas barrier properties, in addition to the beauty of color printing with ordinary color inks, especially the label design by printing inks containing iris color pigments with dichroic effect The expression of pearl luster and iris color can be added, and freshness, fun and elegance of luxury can be added to the design, and in-mold label containers with superior design and luxury can be provided with high productivity. There is an effect.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view showing the structure of an example of a label used in an in-mold label container according to the present invention, and is a view for explaining the reflection and transmission (absorption) state of incident light incident on a polarization printing layer of the label It is.
FIG. 2 is a longitudinal sectional view showing the configuration of an embodiment of the in-mold label container of the present invention.
FIG. 3 is a development view for explaining an example of the shape of a label to be in-mold formed on the outer peripheral surface of the peripheral wall of the in-mold label container of the present invention.
4 is a rear view of the in-mold label container shown in FIG. 2 and is a view for explaining a gap formed between both side ends of a label integrally formed on the outer peripheral surface of the peripheral wall of the container. .
[Explanation of symbols]
1 Transparent base film
Printing layer of characters, designs, etc. with 2-color ink
3 Polarized printing layer
3a Iridescent pigment
4 Thermal adhesive resin layer
11 wall
12 Flange
13 legs
14 Bottom
15 Injection molding resin
16 labels
17a, 17b, 17c Arc-shaped fleshing part
18 Reinforcing rib
19a, 19b Notch
20 Clearance
21 Printing section of characters and designs using color ink
22 Printed part with ink containing iris pigment with dichroic effect
100 in-mold label container

Claims (3)

A cup-shaped container produced by in-mold labeling-type injection molding, on the outer peripheral surface of the peripheral wall of the cup-shaped container, at least on the back surface of a transparent base film, a printed layer of characters, designs, etc. with ordinary color ink And a polarizing printing layer made of an ink containing an iris pigment having a dichroic effect, and a label made of a laminated sheet on which a heat-adhesive resin layer is further provided is in-mold molded. An in-mold label container. The in-mold label container according to claim 1, wherein the iris color pigment is titanium dioxide or iron oxide-coated mica. The in-mold label container according to claim 1 or 2, wherein a gas barrier layer is further provided on the laminated sheet of the label.

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