JP5907402B2 - In-mold label container and manufacturing method thereof - Google Patents

Description

  The present invention relates to an in-mold label container that can enhance the gas barrier property of the entire in-mold label container and a method for manufacturing the same.

  The in-mold label container is obtained by setting a label having a heat seal layer on a mold in advance during injection molding and fusing the heat seal layer of the label to the injection resin surface with the heat of the resin during molding. .

  As an in-mold label container using a gas barrier label, an in-mold label container having a body part and a bottom part is known. In such an in-mold label container, a label having a strong waist and a high gas barrier property is fixed to the trunk as an insert material. Thereby, the in-mold label container which has the barrier property which raised the mechanical strength of the whole container with the strength of the waist of a label can be provided. Here, as the label, a label is used in which a firm base layer and a barrier layer made of a synthetic resin material having gas barrier properties are laminated.

  However, in the conventional in-mold label container, in particular, at the bottom, a technique for easily and reliably increasing the gas barrier property has not been developed, and therefore the gas barrier property of the entire in-mold label container is insufficient.

  In this case, it may be possible to arrange a gas barrier label at the bottom of the in-mold label container. However, it is necessary to provide a gate hole for resin injection in the label at the bottom, and gas permeation from this portion is inevitable. Moreover, the apparatus which inserts two types of labels (a trunk | drum, a bottom part) is complicated, and the yield of a molded article is also bad. Furthermore, there is a problem that the cost of the label is increased.

JP-A-8-132477

  The present invention has been made in consideration of the above points, and is an in-mold label container in which a label is disposed only in the body part, and the in-mold label container capable of enhancing the gas barrier property as a whole container and its An object is to provide a manufacturing method.

The present invention includes a body part and a bottom part, the body part has a label having gas barrier properties, and an injection resin layer formed on the inner surface of the label, and the bottom part has an injection resin layer and an outer surface of the injection resin layer possess a hydrophilic treated layer of the gas barrier coat layer formed through the bottom without having a label with a gas barrier property is the in-mold label container, characterized in that to obtain a gas barrier property with a gas barrier coat layer .

  The present invention is the in-mold label container characterized in that the gas barrier coat layer contains an organic resin as a base and a mica-like inorganic substance mixed in the organic resin.

  The present invention is the in-mold label container, wherein the organic resin is composed of EVOH resin or PVA resin.

  The present invention comprises a body part and a bottom part, the body part comprising a label having gas barrier properties and an injection resin layer formed on the inner surface of the label, and the bottom part comprising an in-mold label container body comprising an injection resin layer. An in-mold label container comprising: a step of preparing; a step of forming a hydrophilic treatment layer on the bottom outer surface of the in-mold label container body; and a step of forming a gas barrier coat layer on the hydrophilic treatment layer. It is a manufacturing method.

The present invention is the method for producing an in-mold label container, wherein the gas barrier coat layer is formed by coating a gas barrier coat layer material on the hydrophilic treatment layer by a spin coating method.
The present invention is the method for producing an in-mold label container, wherein the hydrophilic treatment layer includes SiO ₂ nanoparticles generated by burning and oxidizing a silane coupling agent .

  As described above, according to the present invention, the bottom portion has the injection resin layer and the gas barrier coat layer formed on the outer surface of the injection resin layer via the hydrophilic treatment layer. And the gas barrier properties of the entire container can be improved.

FIG. 1 is a sectional view showing an in-mold label container according to an embodiment of the present invention. FIG. 2 is a view showing a method for manufacturing an in-mold label container. FIG. 3 is a perspective view showing an in-mold label container. FIG. 4 is an enlarged sectional view showing the in-mold label container shown in FIG. FIG. 5A is a plan view showing a label, and FIG. 5B is a diagram showing a layer structure of the label.

  Embodiments of the present invention will be described below with reference to the drawings.

  As shown in FIGS. 1 to 5 (a) and 5 (b), the in-mold label container 10 includes a substantially cylindrical body portion 11 having a flange 14, and a bottom portion 12 connected to the lower portion of the body portion 11, A protrusion 13 extending downward is formed on the periphery of the bottom 12.

  Among these, the trunk | drum 11 has the label 5 which is located in an outer surface and has gas barrier property, and the injection resin layer 8 formed in the inner surface of the label 5 by injection.

The bottom 12 has an injection resin layer 8 and a gas barrier coating layer 12B having gas barrier properties formed on the outer surface of the injection resin layer 8 via a hydrophilic treatment layer 12A. It is curved and has a pair of edges 5A, 5B.

  As will be described later, since the label 5 includes a layer having gas barrier properties, the label 5 has high gas barrier properties.

  Next, the label 5 will be described below.

  As shown in FIG. 5A, the label 5 is formed in a curved band shape, and is inserted into a mold 20 including a cavity 22 and a core 21 described later.

  The label 5 having such a shape is generally composed of an adhesive layer 5c with a printing base material layer 5a, a gas barrier layer 5b, and an injection resin layer 8. Each of these layers 5a, 5b, and 5c is independently formed into a film and bonded (dry lamination) via an adhesive, or a part or all of the layers 5a, 5b, and 5c are melt-extruded (EC, co-rotated). It can also be formed by extrusion. Moreover, the printing base material layer 5a can also be abbreviate | omitted according to a use and the objective.

  The film as the printing substrate 5a is not particularly limited as long as it is generally printable, and for example, a polyester film, a polypropylene film, a nylon film, or the like can be used as appropriate.

  Examples of the gas barrier layer 5b include (a) aluminum foil (Al), (b) VM-PET (aluminum-deposited PET), (c) silica-deposited PET, (d) other, polyacrylonitrile-based resin, EVOH (ethylene acetate) Vinyl copolymer saponified product), PVDC (polyvinylidene chloride) film, PVDC-coated biaxially stretched plastic film, and the like, and may be appropriately selected according to the desired performance.

  The adhesive layer 5c is not particularly limited as long as it adheres to the injection resin layer 8. Usually, the same material plastic as the injection resin layer 8, polyethylene containing EVA (ethylene / vinyl acetate copolymer), etc. A resin having adhesiveness, or a plastic film on which these resins are coextruded or coated can be suitably used.

  In addition, each said layer is formed in accordance with a conventional method by the dry lamination method, the extrusion lamination method, the extrusion coating method, and other coating methods.

Specifically, a label having the following layer structure can be used as the label 5.
(1) Stretched polypropylene layer (OPP) / Aluminum vapor-deposited PET layer (VM-PET) / Heat seal stretched polypropylene layer (HSOPP)
(2) Stretched polypropylene layer (OPP) / Aluminum foil (Al) / Heat seal stretched polypropylene layer (HSOPP)
Moreover, as the injection resin layer 8 used for the in-mold label container 10 of the present invention, an injection-moldable thermoplastic resin such as polypropylene, polyethylene, polystyrene, or the like can be used.

  Next, the hydrophilic treatment layer 12A and the gas barrier coat layer 12B constituting the bottom 12 of the in-mold label container 10 will be described.

The hydrophilic treatment layer 12A is made of SiO ₂ nanoparticles produced by burning and oxidizing a silane coupling agent in the air, and is formed on the outer surface of the injection resin layer 8 at the bottom 12. The hydrophilic treatment layer 12A can reliably form the gas barrier coat layer 12B on the hydrophilic treatment layer 12A using a gas barrier coat layer material as described later.

Specifically, a compressed mixture of 0.6% silane coupling agent and 7: 3 propane-butane (Silicoater silicoater (trademark registration No. 5316644)) is placed in a pen-like torch. And coating the compressed mixture by burning in air, and a silane coupling agent is oxidized is formed SiO ₂ nanoparticles 2~5nm is, the surface of the injected resin layer 8 the flame impinges on this SiO ₂ nanoparticles To do.

Although the example in which the hydrophilic treatment layer 12A is formed from SiO ₂ nanoparticles is shown, the hydrophilic treatment layer 12A is subjected to frame treatment, corona treatment, or plasma treatment on the injection resin layer 8. May be formed.

  Next, the gas barrier coat layer 12B will be described. The gas barrier coat layer 12B includes an organic resin as a base and a plate-like inorganic substance mixed in the organic resin.

  Among these, EVOH (ethylene vinyl acetate copolymer) and PVA (polyvinyl alcohol) can be used as the organic resin.

  The plate-like inorganic materials include clay, clays such as kaolinite, dickite, nacrite, halloysite, antigolite, chrysotile, pyrophyllite, montmorillonite, beidellite, nontronite, saponite, sauconite, stevensite, hectorite, tetra Examples include silicic mica, sodium teniolite, muscovite, margarite, talc, vermiculite, phlogopite, xanthophyllite, chlorite.

  The gas barrier coat layer 12B described above is formed by coating the gas barrier coat layer material on the hydrophilic treatment layer 12A by a spin coating method and then drying the gas barrier coat layer material.

  Alternatively, when the gas barrier coat layer 12B is formed on the hydrophilic treatment layer 12A, the gas barrier coat layer material may be formed by a spray coating method, a printing method, or a dip coating method. May be.

  The thickness of the gas barrier coat layer 12B formed on the hydrophilic treatment layer 12A is 0.1 μm to 10 μm, preferably 0.25 μm or more.

  Next, a method for manufacturing an in-mold label container will be described with reference to FIG.

  First, as shown in FIG. 2, the label 5 is inserted into a mold 20 having a cavity 22 and a core 21. In this case, the label 5 is previously adsorbed on the side surface 22 a of the cavity 22.

  Next, the core 21 is brought close to the cavity 22, the core 21 is inserted into the cavity 22, and the cavity 22 and the core 21 are clamped.

  In this state, the injection resin is injected into the space between the cavity 22 and the core 21 from the injection resin injection port 23 provided in the cavity 22 and opening on the bottom surface 22b side (FIG. 2).

  In this manner, an in-mold label container body 10 </ b> A including the body portion 11 having the flange 14 and the bottom portion 12 having the protruding portion 13 is obtained. In this case, the body portion 11 includes a label 5 and an injection resin layer 8 formed on the inner surface of the label 5. The bottom 12 is made of an injection resin layer 8 (FIG. 2).

Next, the silane coupling agent is oxidized in the air against the outer surface of the injection resin layer 8 at the bottom 12 to oxidize the silane coupling agent to form a hydrophilic treatment layer 12A made of SiO ₂ nanoparticles of _{2 to 5} nm. Form.

  Next, a gas barrier coating layer material is coated on the hydrophilic treatment layer 12A by a spin coating method. As a result, the gas barrier coat layer 12B can be formed on the hydrophilic treatment layer 12A.

In this case, the following conditions can be considered as conditions for the spin coating method.
(1) The rotation speed of the in-mold label container body 10A is 200 to 3000 rotations / minute, preferably 800 to 2000 rotations / minute.
(2) The rotation time of the in-mold label container body 10A is 0.5 to 4 seconds, preferably 0.5 to 2 seconds.
(3) The coating amount of the gas barrier coat layer material is 0.1 to 0.5 cc, preferably 0.2 cc.
(4) The viscosity of the gas barrier coat layer material is 40 to 80 cps, preferably 60 cps.

  Thus, the gas barrier coat layer material is coated on the hydrophilic treatment layer 12A by the spin coating method, and then the gas barrier coat layer material is dried, so that the gas barrier coat layer 12B is reliably formed on the hydrophilic treatment layer 12A. can do.

  Thus, the in-mold label container 10 according to the present invention can be obtained.

Example 1
Next, specific examples of the present invention will be described.

  First, a label 5 having the following layer structure was inserted between the cavity 22 and the core 21 of the mold 20, and PP was injected as an injection resin between the cavity 22 and the core 21.

Layer structure of label 5: OPP / VMPET / OPP
In this manner, an in-mold label container body 10 </ b> A including the body portion 11 having the flange 14 and the bottom portion 12 having the protruding portion 13 is obtained. In this case, the body portion 11 of the in-mold label container body 10 </ b> A includes the label 5 and the injection resin layer 8, and the bottom portion 12 includes the injection resin layer 8.

Thereafter, a hydrophilic treatment layer (0.6% hexamethyldisiloxane and 7: 3 propane-butane compressed mixed gas was burned in the air on the outer surface of the injection resin layer 8 at the bottom 12 and the tip of the flame was placed at the bottom of the cup. To 12 seconds). Next, a gas barrier coat layer material is coated on the hydrophilic treatment layer 12A under the following spin coating conditions by a spin coating method, and the gas barrier coat layer material is dried to form a gas barrier coat layer (copolymer with ethylene vinyl alcohol). 12B was formed by mixing a polymer resin with a plate-like inorganic material made of nano-sized mica in a plate shape) to obtain an in-mold label container 10 having a diameter of 71 mm and 250 ml.
Spin coating conditions Rotation speed 1000 (rpm)
Drop volume 0.2 (ml)
Rotation time 2 (seconds)
Number of coats 1
At this time, the thickness of the gas barrier coat layer 12B was 3.49 μm, and the oxygen permeability of the entire in-mold label container 10 was 0.042 cc / package · day · atm.

Example 2
First, a label 5 having the following layer structure was inserted between the cavity 22 and the core 21 of the mold 20, and PP was injected as an injection resin between the cavity 22 and the core 21.

Layer structure of label 5: OPP / VMPET / OPP
In this manner, an in-mold label container body 10 </ b> A including the body portion 11 having the flange 14 and the bottom portion 12 having the protruding portion 13 is obtained. In this case, the body portion 11 of the in-mold label container body 10 </ b> A includes the label 5 and the injection resin layer 8, and the bottom portion 12 includes the injection resin layer 8.

Thereafter, a hydrophilic treatment layer (0.6% hexamethyldisiloxane and 7: 3 propane-butane compressed mixed gas was burned in the air on the outer surface of the injection resin layer 8 at the bottom 12 and the tip of the flame was placed at the bottom of the cup. To 12 seconds). Next, on the hydrophilic treatment layer 12A, a material for gas barrier coat layer (ethylene vinyl alcohol copolymer resin mixed with nano-sized mica as a plate-like inorganic substance was mixed under the following spin coat conditions. Were coated by a spin coating method, and the gas barrier coating layer material was dried to form the gas barrier coating layer 12B.
Spin coating conditions Rotation speed 1400 (rpm)
Drop volume 0.2 (ml)
Rotation time 2 (seconds)
Number of coats 1
At this time, the thickness of the gas barrier coat layer 12B was 2.01 μm, and the oxygen permeability of the entire in-mold label container 10 was 0.048 cc / package · day · atm.

Example 3
First, a label 5 having the following layer structure was inserted between the cavity 22 and the core 21 of the mold 20, and PP was injected as an injection resin between the cavity 22 and the core 21.

Layer structure of label 5: OPP / VMPET / OPP
In this manner, an in-mold label container body 10 </ b> A including the body portion 11 having the flange 14 and the bottom portion 12 having the protruding portion 13 is obtained. In this case, the body portion 11 of the in-mold label container body 10 </ b> A includes the label 5 and the injection resin layer 8, and the bottom portion 12 includes the injection resin layer 8.

Thereafter, a hydrophilic treatment layer (0.6% hexamethyldisiloxane and 7: 3 propane-butane compressed mixed gas was burned in air on the outer surface of the injection resin layer 8 at the bottom 12 and the flame tip was placed at the bottom of the cup at 0.5. 12A was formed. Next, on the hydrophilic treatment layer 12A, a gas barrier coat layer material ethylene vinyl alcohol copolymer resin mixed with nano-sized mica as a plate-like inorganic material under the following spin coat conditions ) Was coated by a spin coating method, and the gas barrier coating layer material was dried to form a gas barrier coating layer 12B.
Spin coating conditions Rotation speed 2000 (rpm)
Drop volume 0.2 (ml)
Rotation time 2 (seconds)
Number of coats 2
At this time, the thickness of the gas barrier coat layer 12B was 1.67 μm, and the oxygen permeability of the entire in-mold label container 10 was 0.054 cc / package · day · atm.

Example 4
First, a label 5 having the following layer structure was inserted between the cavity 22 and the core 21 of the mold 20, and PP was injected as an injection resin between the cavity 22 and the core 21.

Layer structure of label 5: OPP / VMPET / OPP
In this manner, an in-mold label container body 10 </ b> A including the body portion 11 having the flange 14 and the bottom portion 12 having the protruding portion 13 is obtained. In this case, the body portion 11 of the in-mold label container body 10 </ b> A includes the label 5 and the injection resin layer 8, and the bottom portion 12 includes the injection resin layer 8.

  Thereafter, a hydrophilic treatment layer (0.6% hexamethyldisiloxane and 7: 3 propane-butane compressed mixed gas was burned in air on the outer surface of the injection resin layer 8 at the bottom 12 and the flame tip was placed at the bottom of the cup at 0.5. 12A was formed. Next, on the hydrophilic treatment layer 12A, a material for gas barrier coat layer (ethylene vinyl alcohol copolymer resin mixed with nano-sized mica as a plate-like inorganic substance was mixed under the following spin coat conditions. Were coated by a spin coating method, and the gas barrier coating layer material was dried to form a gas barrier coating layer 12B. Thus, an in-mold label container 10 having a diameter of 71 mm and 250 ml was obtained.

Spin coating conditions Rotation speed 2000 (rpm)
Drop volume 0.2 (ml)
Rotation time 2 (seconds)
Number of coats 1
At this time, the thickness of the gas barrier coat layer 12B was 0.71 μm, and the oxygen permeability of the entire in-mold label container 10 was 0.056 cc / package · day · atm.

Comparative Example 1
Next, a comparative example of the present invention will be described.

  First, a label 5 having the following layer structure was inserted between the cavity 22 and the core 21 of the mold 20, and PP was injected as an injection resin between the cavity 22 and the core 21.

Layer structure of label 5: OPP / VMPET / OPP
In this manner, an in-mold label container body 10 </ b> A including the body portion 11 having the flange 14 and the bottom portion 12 having the protruding portion 13 is obtained. In this case, the body portion 11 of the in-mold label container body 10 </ b> A includes the label 5 and the injection resin layer 8, and the bottom portion 12 includes the injection resin layer 8. An in-mold label container 10 having a diameter of 71 mm and 250 ml was obtained without forming the hydrophilic treatment layer 12A and the gas barrier coat layer 12B on the label container body 10A.

  At this time, the oxygen permeability of the entire label container 10 was 0.173 cc / package · day · atm.

Example 5
First, a label 5 having the following layer structure was inserted between the cavity 22 and the core 21 of the mold 20, and PP was injected as an injection resin between the cavity 22 and the core 21.

Layer structure of label 5: OPP / Al / OPP
In this manner, an in-mold label container body 10 </ b> A including the body portion 11 having the flange 14 and the bottom portion 12 having the protruding portion 13 is obtained. In this case, the body portion 11 of the in-mold label container body 10 </ b> A includes the label 5 and the injection resin layer 8, and the bottom portion 12 includes the injection resin layer 8.

Thereafter, a hydrophilic treatment layer (0.6% hexamethyldisiloxane and 7: 3 propane-butane compressed mixed gas was burned in air on the outer surface of the injection resin layer 8 at the bottom 12 and the flame tip was placed at the bottom of the cup at 0.5. 12A was formed. Next, on the hydrophilic treatment layer 12A, a material for gas barrier coat layer (ethylene vinyl alcohol copolymer resin mixed with nano-sized mica as a plate-like inorganic substance was mixed under the following spin coat conditions. Were coated by a spin coating method, and the gas barrier coating layer material was dried to form a gas barrier coating layer 12B. Thus, a 200 ml in-mold label container 10 having a diameter of 71 mm was obtained.
Spin coating conditions Rotation speed 1100 (rpm)
Drop volume 0.2 (ml)
Rotation time 3 (seconds)
Number of coats 1
At this time, the thickness of the gas barrier coat layer 12B was 1.61 μm, and the oxygen permeability of the entire in-mold label container 10 was 0.034 cc / package · day · atm.

Example 6
First, a label 5 having the following layer structure was inserted between the cavity 22 and the core 21 of the mold 20, and PP was injected as an injection resin between the cavity 22 and the core 21.

Layer structure of label 5: OPP / Al / OPP
In this manner, an in-mold label container body 10 </ b> A including the body portion 11 having the flange 14 and the bottom portion 12 having the protruding portion 13 is obtained. In this case, the body portion 11 of the in-mold label container body 10 </ b> A includes the label 5 and the injection resin layer 8, and the bottom portion 12 includes the injection resin layer 8.

  Thereafter, a hydrophilic treatment layer (0.6% hexamethyldisiloxane and 7: 3 propane-butane compressed mixed gas was burned in air on the outer surface of the injection resin layer 8 at the bottom 12 and the flame tip was placed at the bottom of the cup at 0.5. 12A was formed. Next, a material for gas barrier coat layer (ethylene vinyl alcohol copolymer resin mixed with nano-sized silicate rock as a plate-like inorganic material) is mixed by spin coating method on hydrophilic treatment layer 12A. The coating was performed, and the gas barrier coat layer material was dried to form a gas barrier coat layer 12B. Thus, an in-mold label container 10 having a diameter of 71 mm and 200 ml was obtained.

Spin coating conditions Rotation speed 1100 (rpm)
Drop volume 0.2 (ml)
Rotation time 3 (seconds)
Number of coats 1
At this time, the thickness of the gas barrier coat layer 12B was 1.85 μm, and the oxygen permeability of the entire in-mold label container 10 was 0.045 cc / package · day · atm.

Example 7
First, a label 5 having the following layer structure was inserted between the cavity 22 and the core 21 of the mold 20, and PP was injected as an injection resin between the cavity 22 and the core 21.

Layer structure of label 5: OPP / Al / OPP
In this manner, an in-mold label container body 10 </ b> A including the body portion 11 having the flange 14 and the bottom portion 12 having the protruding portion 13 is obtained. In this case, the body portion 11 of the in-mold label container body 10 </ b> A includes the label 5 and the injection resin layer 8, and the bottom portion 12 includes the injection resin layer 8.

  Thereafter, a hydrophilic treatment layer (0.6% hexamethyldisiloxane and 7: 3 propane-butane compressed mixed gas was burned in air on the outer surface of the injection resin layer 8 at the bottom 12 and the flame tip was placed at the bottom of the cup at 0.5. 12A was formed. Next, a gas barrier coat layer material (polyvinyl alcohol resin mixed with nano-sized mica as a plate-like inorganic material) is coated on the hydrophilic treatment layer 12A by a spin coating method. The layer material was dried to form a gas barrier coat layer 12B, and 200 ml of in-mold label container 10 with a diameter of 71 mm was obtained.

Spin coating conditions Rotation speed 1100 (rpm)
Drop volume 0.2 (ml)
Rotation time 3 (seconds)
Number of coats 1
At this time, the thickness of the gas barrier coat layer 12B was 1.55 μm, and the oxygen permeability of the entire in-mold label container 10 was 0.074 cc / package · day · atm.

Comparative Example 2
Next, a comparative example of the present invention will be described.

  First, a label 5 having the following layer structure was inserted between the cavity 22 and the core 21 of the mold 20, and PP was injected as an injection resin between the cavity 22 and the core 21.

Layer structure of label 5: OPP / Al / OPP
In this manner, an in-mold label container body 10 </ b> A including the body portion 11 having the flange 14 and the bottom portion 12 having the protruding portion 13 is obtained. In this case, the body portion 11 of the in-mold label container body 10 </ b> A includes the label 5 and the injection resin layer 8, and the bottom portion 12 includes the injection resin layer 8. A 200 ml in-mold label container 10 having a diameter of 71 mm was obtained without forming the hydrophilic treatment layer 12A and the gas barrier coat layer 12B on the label container body 10A.

  At this time, the oxygen permeability of the entire label container 10 was 0.194 cc / package · day · atm.

Example 8
First, a label 5 having the following layer structure was inserted between the cavity 22 and the core 21 of the mold 20, and PP was injected as an injection resin between the cavity 22 and the core 21.

Layer structure of label 5: OPP / Al / OPP
In this manner, an in-mold label container body 10 </ b> A including the body portion 11 having the flange 14 and the bottom portion 12 having the protruding portion 13 is obtained. In this case, the body portion 11 of the in-mold label container body 10 </ b> A includes the label 5 and the injection resin layer 8, and the bottom portion 12 includes the injection resin layer 8.

  Thereafter, a hydrophilic treatment layer (0.6% hexamethyldisiloxane and 7: 3 propane-butane compressed mixed gas was burned in air on the outer surface of the injection resin layer 8 at the bottom 12 and the flame tip was placed at the bottom of the cup at 0.5. 12A was formed. Next, the material for gas barrier coating layer (ethylene vinyl alcohol copolymer resin mixed with nano-sized mica as a plate-like inorganic material) is coated on the hydrophilic treatment layer 12A by a spray coating method. Then, the gas barrier coat layer material was dried to form the gas barrier coat layer 12B, and a 200 ml in-mold label container 10 having a diameter of 71 mm was obtained.

  At this time, the thickness of the gas barrier coat layer 12B was 3.68 μm, and the oxygen permeability of the entire in-mold label container 10 was 0.024 cc / package · day · atm.

Example 9
First, a label 5 having the following layer structure was inserted between the cavity 22 and the core 21 of the mold 20, and PP was injected as an injection resin between the cavity 22 and the core 21.

Layer structure of label 5: OPP / Al / OPP
In this manner, an in-mold label container body 10 </ b> A including the body portion 11 having the flange 14 and the bottom portion 12 having the protruding portion 13 is obtained. In this case, the body portion 11 of the in-mold label container body 10 </ b> A includes the label 5 and the injection resin layer 8, and the bottom portion 12 includes the injection resin layer 8.

  Thereafter, a hydrophilic treatment layer (without using a silane coupling agent, 7: 3 compressed mixed gas of propane-butane was burned in the air on the outer surface of the injection resin layer 8 of the bottom portion 12, and the tip of the flame was 0.5 12A was formed. Next, the material for gas barrier coating layer (ethylene vinyl alcohol copolymer resin mixed with nano-sized mica as a plate-like inorganic material) is coated on the hydrophilic treatment layer 12A by a spray coating method. Then, the gas barrier coat layer material was dried to form the gas barrier coat layer 12B, and a 200 ml in-mold label container 10 having a diameter of 71 mm was obtained.

  At this time, the thickness of the gas barrier coat layer 12B was 5.28 μm, and the oxygen permeability of the entire in-mold label container 10 was 0.121 cc / package · day · atm. However, the coating layer was uneven, and there were a portion where the coating agent was applied and a portion where it was not applied.

  Next, the results of Examples 1 to 4 and Comparative Example 1 are shown in Table 1, the results of Examples 5 to 7 and Comparative Example 2 are shown in Table 2, and Example 8, Example 9, and Comparative Example are shown. The results of 2 are shown in Table 3.

As apparent from Tables 1 to 3, in Examples 1 to 9, the bottom portion 12 of the in-mold label container 10 includes a hydrophilic treatment layer 12A and a gas barrier coat layer 12B formed on the injection resin layer 8. Therefore, the gas barrier properties of the entire container could be greatly improved as compared with Comparative Examples 1 and 2.

5 Label 8 Injection resin layer 10 In-mold label container 11 Body 12 Bottom 12A Hydrophilic treatment layer 12B Gas barrier coating layer 13 Protrusion 14 Flange 20 Mold 21 Core 22 Cavity 23 Inlet

Claims (6)

The torso,
With a bottom,
The body portion has a label having gas barrier properties and an injection resin layer formed on the inner surface of the label, and the bottom portion has an injection resin layer and a gas barrier coat formed on the outer surface of the injection resin layer via a hydrophilic treatment layer. And an in-mold label container. Gas barrier coating layer and the organic resin as a base, in-mold label container according to claim 1 Symbol mounting, characterized in that it comprises a micaceous inorganic material mixed in the organic resin. The in-mold label container according to claim 2, wherein the organic resin is made of EVOH resin or PVA resin. Providing a body part and a bottom part, the body part comprising a label having a gas barrier property and an injection resin layer formed on the inner surface of the label, the bottom part preparing an in-mold label container body comprising the injection resin layer; ,
Forming a hydrophilic treatment layer on the bottom outer surface of the in-mold label container body;
And a step of forming a gas barrier coat layer on the hydrophilic treatment layer. The method for producing an in-mold label container according to claim 4 , wherein the gas barrier coat layer is formed by coating a gas barrier coat layer material on the hydrophilic treatment layer by a spin coating method. The method for producing an in-mold label container according to claim 4 or 5, wherein the hydrophilic treatment layer contains SiO ₂ nanoparticles produced by burning and oxidizing a silane coupling agent.

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