JP4202695B2 - In-mold label container and manufacturing method thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an in-mold label container and a method for manufacturing the same , and more particularly to an in-mold label container having a bulging portion that bulges in a circumferential direction at a substantially central portion of a side wall of the container and a method for manufacturing the same. .
[0002]
[Prior art]
Conventionally, as an in-mold label container, a circular bottom wall, a circular side wall having one inner peripheral end connected to the peripheral edge of the bottom wall, and a flange portion connected to the other peripheral edge of the side wall. A cylindrical container having a bottom or a truncated cone shape (having an opening on one side) is known. An in-mold label container places a label with a heat-adhesive resin layer in a mold, injects an injection resin into the mold, and melts the heat-adhesive resin layer of the label with the heat of the resin, simultaneously with molding. The label is bonded and fixed to the surface of the side wall.
[0003]
Since the in-mold label container as described above can be printed beautifully on the label, it is excellent in appealing effect, lightweight, clean, easy to handle, and other beverages such as coffee and juice, or It is widely used as a container for food such as yogurt, jelly and pudding.
[0004]
However, in-mold label containers used as containers for foods and the like described above are mostly of a cylindrical shape or an inverted truncated cone shape, although there are differences in size, and are not satisfactory in terms of product differentiation. It remained. On the other hand, a vertically long slim container represented by beverages such as coffee and juice has a problem that it gives a sense of stability when held by hand because the side wall is straight. The solution of was requested.
[0005]
In order to solve the above problem, for example, there is a container Y as shown in FIG. 4 in which a constricted portion B is provided in the circumferential direction at a substantially central portion of the side wall. If an in-mold label container with an in-mold label attached to the entire surface of the side wall is used, the in-mold label is not used and is not shown in the past because of the problem of wrinkles entering the in-mold label. However, after the container is molded, a tack seal label is stuck on the side wall surface, or a method of covering the entire side wall surface or the entire outer surface of the container with a heat shrink film is adopted. Compared to the container, it was quite time-consuming.
[0006]
[Problems to be solved by the invention]
Therefore, the first object of the present invention is to provide a novel in-mold label container having a bulging portion that bulges in the circumferential direction of the side wall without causing wrinkles in the in-mold label, The second object is to provide a novel in-mold label container that can differentiate products and give a sense of stability when held by hand.
[0007]
In order to achieve the above-mentioned object, the inventor of the present invention has a substantially circular bottom wall and a circular cross-sectional shape in which one inner peripheral end is connected to the periphery of the bottom wall. An in-mold label is affixed to substantially the entire surface of the side wall of the bottomed container having a substantially cylindrical shape or a substantially inverted frustoconical shape having a flange connected to the side wall and the other peripheral edge of the side wall. An in-mold label container, wherein the in-mold label includes at least a base material layer made of any of unstretched polypropylene film, polystyrene film, or synthetic paper and an adhesive layer, and the in-mold label container has a bottom outer diameter. 30 to 100 mmφ and the flange portion neck lower outer diameter is 40 to 120 mmφ, and the side wall is assumed to be a virtual side wall connecting the neck lower portion of the flange portion with a straight vertical section from the bottom portion. The vertical section first straight line section along the virtual side wall from the bottom, the vertical section curved section bulging outward continuously from the vertical section first straight section, and the vertical section curved section continuously to the vertical section curved section. The diameter of the virtual cross section formed by the virtual side wall, which is formed by the virtual side wall of the vertical cross section of the vertical cross section that bulges from the virtual side wall. It is the said longitudinal cross-section curve part which has the largest bulge part which will be 102 to 110% when set to 100. It is characterized by the above-mentioned.
[0008]
According to a second aspect of the present invention, there is provided a substantially circular bottom wall, a circular side wall having one inner peripheral end connected to the peripheral edge of the bottom wall, and a flange portion on the other peripheral edge of the side wall. there are an in-mold label container substantially the entire in-mold label is affixed to the side wall surface of the bottomed container having an opening in one in which the articulated substantially cylindrical or substantially inverted frustoconical, the The in-mold label comprises at least a base material layer made of any of unstretched polypropylene film, polystyrene film or synthetic paper and an adhesive layer, and the in-mold label container has a bottom outer diameter of 30 to 100 mmφ and the flange neck lower outer diameter Is 40 to 120 mm.phi., And when the side wall is assumed to be a virtual side wall connecting the bottom of the flange portion with a straight vertical section from the bottom, The longitudinal section that swells from the imaginary side wall, comprising a first straight portion having a longitudinal section along the imaginary side wall and a curved section having a longitudinal section that continues to bulge outwardly from the first straight portion of the longitudinal section and reaches the lower neck. The longitudinal section curved section having a maximum bulging portion having a diameter of a transverse section of the surface curved section of 102 to 110% when the diameter of the virtual section formed by the virtual side wall intersecting the transverse section is 100 It is characterized by being.
[0009]
By setting it as the said Claim 1, 2, it is set as the container which has the bulging part bulged in the circumferential direction in the approximate center part of the side wall of a container, without producing the malfunction that a wrinkle enters an in-mold label. In addition, since the container can be supported by the bulging portion when it is held by hand, the in-mold label container having a stable feeling can be obtained. In addition, since the in-mold label is provided on the entire periphery of the side wall surface of the container at the same time as the molding, the tack seal label that has been conventionally performed with this type of container is adhered to the side wall surface, or a heat shrink film is used. The operation of covering the entire circumference of the side wall surface or the entire outer surface of the container can be eliminated. Further, the structure of claim 2 can be made more excellent in design than the structure of claim 1, but on the other hand, there is a risk that the mold structure becomes, for example, a split mold structure and the productivity is lowered. is there.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
The above-described present invention will be described in detail below with reference to the drawings.
FIG. 1 is a perspective view showing an embodiment of an in-mold label container according to the present invention, FIG. 2 is a diagram schematically showing a longitudinal section of FIG. 1, and FIG. 3 is a design of the in-mold label container according to the present invention. 1 is an in-mold label container, 2 is a bottom wall, 3 is a side wall, 4 is a flange portion, 5 is a thread bottom, 10 is an in-mold label, and 31 is a longitudinal section. First straight portion, 32 is a longitudinal curved portion, 33 is a second straight portion, A is a bulging portion, I is a virtual side wall, R and r are diameters, S is a cross section of the largest bulging portion, α is The bottom and β indicate the lower neck.
[0011]
FIG. 1 is a perspective view showing an embodiment of an in-mold label container according to the present invention. FIG. 2 is a diagram schematically showing a longitudinal section of FIG. And a side wall 3 having a circular cross section with one inner peripheral end connected to the peripheral edge of the bottom wall 2 and a substantially inverted truncated cone shape having a flange 4 connected to the other peripheral edge of the side wall 3. A bottomed container having an opening, provided with a bulging portion A that bulges in a circumferential direction at a substantially central portion of the wall surface 3 and an in-mold label 10 attached to substantially the entire surface of the side wall 3 It has been done. A yarn bottom 5 is formed at the lower part of the circular bottom wall.
[0012]
FIG. 3 is a longitudinal sectional view for explaining the main points of the design of the in-mold label container according to the present invention. The in-mold label container 1 corresponds to the bottom α of the side wall 3 (corresponding to the periphery of the bottom wall 2). The outer side of the flange portion 4 has an outer diameter of 40 to 120 mmφ, and the side wall 3 of the in-mold label container 1 extends from the bottom α to the flange. Assuming a virtual side wall I in which the neck lower part β of the part 4 is connected by a vertical cross-section straight line, the vertical cross-section first straight portion 31 along the virtual side wall I and the vertical cross-section first straight portion 31 are continuous from the bottom α. The longitudinal section bulging from the imaginary side wall I is composed of a longitudinal section curved section 32 bulging outward and a longitudinal section second straight section 33 continuing to the longitudinal section curved section 32 and reaching the neck lower part β. Diameter R of cross section S of curved surface portion 32 Is designed to have a maximum bulging portion of 102 to 110%, preferably 102 to 105%, where the diameter r of the virtual cross section formed by the virtual side wall I intersecting the cross section S is 100. By doing, it can be set as the container which does not produce a wrinkle in an in-mold label.
[0013]
In the present embodiment, the example in which the longitudinal section second straight portion 33 is continuous with the longitudinal section curved portion 32 has been described. However, although not illustrated, the longitudinal section curved portion 32 is the flange portion 4. It may be a side wall that continues to the neck lower part β and does not have a straight part.
[0014]
Next, the material which comprises the in-mold label container 1 is demonstrated. The in-mold label container 1 includes a container molding resin for molding the container and an in-mold label 10. The container molding resin is not particularly limited as long as it is a thermoplastic resin that can be injection-molded. For example, resins such as polypropylene, polyethylene, and polystyrene can be used.
[0015]
The in-mold label 10 is generally composed of a printing base layer and an adhesive layer that can be bonded to the container molding resin. The printing substrate layer used in the present invention is preferably a film that can be printed and can be stretched to some extent by the heat of the resin during injection molding. For example, an unstretched polypropylene film (hereinafter referred to as a CPP film). ), Polystyrene film (hereinafter referred to as PS film), or synthetic paper.
[0016]
The adhesive layer is not particularly limited as long as it can be adhered to the container molding resin. Usually, a film made of the same resin as the container molding resin, for example, a CPP film, unstretched A heat sealing agent in which a polyethylene film (hereinafter referred to as PE film), a PS film, an ethylene-vinyl acetate copolymer (hereinafter referred to as EVA) film, or a resin similar to the container molding resin is made into a solution Examples thereof include a resin layer formed by (hereinafter referred to as an HS agent).
[0017]
For example, if the container molding resin is a propylene resin, for example, a CPP film (printing substrate layer) / printing layer / CPP film, CPP film (printing) Substrate layer) / printing layer / HS agent layer (chlorinated polypropylene), printing layer / synthetic paper [manufactured by Oji Yuka Co., Ltd .: YUPO FGS (trade name)] and the like. If the container molding resin is an ethylene resin, for example, CPP film (printing substrate layer) / printing layer / PE film, CPP film (printing substrate layer) / printing layer / HS agent layer (chlorinated polyethylene or EVA) ), Printing layer / synthetic paper [manufactured by Oji Yuka Co., Ltd .: YUPO ITF (trade name)] and the like, and if the container molding resin is a styrene resin, , CPP film (printing substrate layer) / printing layer / HS agent layer (acrylic resin or EVA resin), PS film (printing substrate layer) / printing layer / PS film, printing layer / synthetic paper (Oji Oil) Examples include the configuration of YUPO FGS (trade name)].
[0018]
When the in-mold label 10 is required to have a gas barrier property, a configuration in which a gas barrier layer, for example, a saponified ethylene-vinyl acetate copolymer, polyvinylidene chloride, or the like is provided on the outer surface side of the adhesive layer. It is good. The in-mold label 10 is formed by a known lamination method and coating method such as dry lamination, extrusion lamination method, extrusion coating method, and other coating methods according to a conventional method.
[0019]
【The invention's effect】
As described above, the present invention is a novel device having a bulging portion that bulges in the circumferential direction of the side wall without causing wrinkles in the in-mold label by adopting the configuration described in claims 1 and 2. A simple in-mold label container can be easily obtained. Furthermore, by providing a bulging portion, it is possible to provide a novel in-mold label container that can be designed to enable differentiation of products and can give a sense of stability when held by hand. Can do.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an embodiment of an in-mold label container according to the present invention.
FIG. 2 is a diagram schematically showing a longitudinal section of FIG. 1;
FIG. 3 is a longitudinal sectional view for explaining the main points of the design of the in-mold label container according to the present invention.
FIG. 4 is a view showing an example of a conventional container.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 In-mold label container 2 Bottom wall 3 Side wall 4 Flange part 5 Yarn bottom 10 In-mold label 31 1st linear part 32 longitudinal cross-section curved part 33 2nd straight part A longitudinal section A bulging part I Virtual side wall R, r Diameter S Cross section of maximum bulge α Bottom β Lower neck

Claims (3)

A substantially circular bottom wall, a circular side wall having a circular cross-section with one inner peripheral end connected to the peripheral edge of the bottom wall, and a substantially cylindrical shape or a substantially inverted cone having a flange connected to the other peripheral edge of the side wall An in-mold label container in which an in-mold label is affixed to substantially the entire surface of the side wall of a bottomed container having an opening in a trapezoid shape, wherein the in-mold label is at least an unstretched polypropylene film, polystyrene The in-mold label container includes a base layer made of either film or synthetic paper and an adhesive layer, and the in-mold label container has a bottom outer diameter of 30 to 100 mmφ and an outer diameter of the flange neck lower portion of 40 to 120 mmφ, and the side wall When assuming a virtual side wall connecting the bottom portion of the flange portion from the bottom portion with a vertical cross-section straight line, a vertical cross-section first straight portion along the virtual side wall from the bottom portion and the A longitudinal section curved portion that bulges outward continuously from the first straight section of the longitudinal section and a second straight section of longitudinal section that continues to the longitudinal section curved section and reaches the lower neck, and bulges from the virtual side wall The longitudinal section having a maximum bulging portion that is 102 to 110% when the diameter of a virtual cross section formed by the virtual side wall that intersects the cross section is 100. An in-mold label container characterized by being a surface curve portion. A substantially circular bottom wall, a circular side wall having a circular cross-section with one inner peripheral end connected to the peripheral edge of the bottom wall, and a substantially cylindrical shape or a substantially inverted cone having a flange connected to the other peripheral edge of the side wall An in-mold label container in which an in-mold label is affixed to substantially the entire surface of the side wall of a bottomed container having an opening in a trapezoid shape, wherein the in-mold label is at least an unstretched polypropylene film, polystyrene The in-mold label container includes a base layer made of either film or synthetic paper and an adhesive layer, and the in-mold label container has a bottom outer diameter of 30 to 100 mmφ and an outer diameter of the flange neck lower portion of 40 to 120 mmφ, and the side wall When assuming a virtual side wall connecting the bottom of the flange portion from the bottom portion with a straight vertical cross section, a first vertical straight section along the virtual side wall from the bottom portion; The longitudinal cross-sectional curved portion that bulges outwards continuously to the first straight portion of the longitudinal section and reaches the lower neck portion, and the diameter of the transverse section of the curved longitudinal section that bulges from the virtual side wall is the transverse An in-mold label container comprising the longitudinal section curved portion having a maximum bulging portion which is 102 to 110% when a diameter of a virtual cross section formed by the virtual side wall intersecting with a plane is 100 . The method for producing an in-mold label container according to claim 1 or 2, wherein an in-mold label having an adhesive layer and a base layer composed of at least an unstretched polypropylene film, a polystyrene film or a synthetic paper is placed in the mold. A method for producing an in-mold label container in which an injection resin is injected into a mold, the adhesive layer is melted by heat of the resin, and the in-mold label is bonded to the side wall surface at the same time as molding.

Images