JP3586277B2 - In-mold label container - Google Patents

Description

  The present invention relates to an in-mold label container capable of obtaining a reliable gas barrier property.

  In-mold label molding is performed by setting a label with a heat seal layer on the mold in advance at the time of blow or injection molding, and fusing the heat seal layer of the label to the surface of the molded product by the heat of the resin at the time of molding. This is a molding method in which labeling is performed simultaneously with molding.

  As an in-mold label container using a gas barrier label, there is, for example, one disclosed in Japanese Utility Model Laid-Open No. 5-95847. This in-mold label container is an injection molded product made of synthetic resin, and is formed by sticking a label having high stiffness and high gas barrier properties as an insert material to the entire side portion and the entire bottom portion of a thin container having a bottomed cylindrical shape. With such a configuration, the mechanical strength of the entire container can be enhanced by the stiffness of the label, and the barrier property can be enhanced. Here, as the label, a label in which a main body layer made of strong paper or synthetic paper and a barrier layer made of a synthetic resin material having gas barrier properties are used is used.

In the conventional gas-barrier in-mold label container and its manufacturing method, the in-mold label has a side label corresponding to the side of the container and located on the outer surface side, and a bottom label corresponding to the bottom of the container, and the side label is It has a shape excluding a small sector having the same center as the large sector from the large sector, and the bottom label has a circular shape. When the side edges of the side label abut the mold, the side edges of the side label are turned up, and the resin may flow into the outer surface of the side label. In this case, the side label is not arranged at a correct position, and therefore, a problem occurs in the gas barrier property.

  The present invention has been made in view of such a point, and an object of the present invention is to provide an in-mold label container which has high gas barrier properties and can be easily manufactured.

The present invention relates to an in-mold label container having a side portion having a threading portion below and a bottom portion provided inside the upper end of the threading portion on each side, each including a barrier layer and corresponding to the bottom portion. a bottom label, the in-mold label having a side label corresponding to the side, and a injection resin injected into the in-mold label surface side label from its outer large fan, identical to this large sector An in-mold label container having a shape excluding a small fan shape having a center, and a cutout portion formed at a lower portion of both side edges of the shape of the side label .

  According to the present invention, since the notch is formed in the lower part of both sides of the side label, when the side label is mounted in the mold from the lower part of both sides, the lower part of both sides of the side label is inside the mold. This part does not turn over in contact with.

  As described above, according to the present invention, when the side labels are mounted in the mold from the lower side portions of the side edges, the lower portions of the side edges of the side labels do not come into contact with the inside of the mold and are not turned up. For this reason, the injection resin does not wrap around the side label when the side label is turned up.

First Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  As shown in FIGS. 1 (a) and 1 (b), the in-mold label container 10 is provided on a cylindrical side portion 10a having a threading portion 11 below, and inside the upper end of the threading portion 11 of the side portion 10a. It has a bottom part 10b and a flange part 10c provided above the side part 10a.

The side portion 10a includes a side label 1 (FIG. 4A) having a shape obtained by removing a small sector having the same center as the large sector from a large sector including the barrier layer and located outside. It consists of an injection resin 7 injected on the inner surface. The bottom portion 10b is composed of a circular bottom label 2 including a barrier layer (FIG. 4B) and an injection resin 7 injected into the inner surface of the bottom label 2. A gate hole 6 is formed in the center of the bottom label 2 among them.

  The side label 1 and the bottom label 2 are mounted in the female mold 3 of the mold, and are sucked by the vacuum suction holes 8 provided in the female mold 3. For this reason, the side label 1 and the bottom label 2 are arranged on the outer side of the side 10a and the bottom 10b of the container 10, respectively.

Next, the side label 1 will be described in detail with reference to FIG. As shown in FIG. 4A, the side label 1 has a shape obtained by removing a small sector having the same center as the large sector from the large sector, and the lower part of both side edges 1a of the side label 1 (see FIG. 4A). Notches 12 and 12 are formed in the lower part of FIG.

  The notches 12, 12 extend to a portion corresponding to the threading portion 11 of the side portion 10a. Therefore, the height h of the notches 12, 12 is from the lower end of the side label 1 to the upper end of the threading portion 11. Approximately match the distance.

  By providing the cutouts 12 and 12 in the side label 1 in this manner, when the side label 1 is mounted in the female mold 3, the lower portions of both side edges 1 a and 1 a of the side label 1 correspond to the projecting portions 3 a of the female mold 3. The lower part of the side label 1 is not turned up due to the contact. For this reason, the injection resin 7 does not go around the outside of the side surface label 1 with the turning of the side surface label 1, and the side surface label 1 can be correctly arranged at the position outside the side portion 1a.

  Further, as shown in FIG. 1B, the bottom label 2 has a diameter smaller than the outer diameter A of the side portion 10a on the placement surface of the bottom label 2 and the outer diameter of the bottom portion 10b on the placement surface of the bottom label 2. It is larger than the diameter B.

That is, B <diameter of bottom label 2 <A
It has become.

  Further, the peripheral edge 2a of the bottom label 2 protrudes outward from the bottom 10b and descends downward.

  By making the diameter of the bottom label 2 larger than the outer diameter B of the bottom portion 10b in this way, even if the bottom label 2 is slightly shifted when the bottom label 2 is mounted in the female mold 3, the container 10 The bottom 10b can be sufficiently covered. Therefore, the gas barrier property of the bottom portion 10b can be improved. Further, the gas barrier property of the threading portion 11 of the side portion 10a can be improved by the outer peripheral portion 2a of the bottom label 2 projecting outward from the bottom portion 10b and descending downward.

  In addition, by making the diameter of the bottom label 2 smaller than the outer diameter A of the side portion 10a, the injection resin 7 can smoothly flow around the threading portion 11.

  Next, the material of each part will be described in detail. First, polypropylene is used as the material of the injection resin 7, and a film in which three layers of a polyethylene terephthalate film (12 μm) / aluminum foil (15 μm) / polypropylene film (60 μm) are sequentially laminated is used as the side label 1 and the bottom label 2. it can. The side label 1 and the bottom label 2 are printed on the PET film, which is the outermost layer, on a PET film, and then the aluminum foil, which is the barrier layer, is laminated using an adhesive. It is formed from a three-layer film laminated by using, and is punched into a predetermined shape.

  In addition, while using polypropylene as the material of the injection resin that becomes the container body, in addition to the above as the side labels and the bottom labels 1 and 2, in order from the outermost to the innermost, using a film having the following layer configuration Is also good.

(1) Stretched polypropylene film (printing substrate) (25 μm) / aluminum foil (barrier layer) (15 μm) / stretched polypropylene film (adhesive layer) having heat seal layer (25 μm),
(2) Stretched polypropylene film (printing substrate) (25 μm) / silicon oxide-deposited polyethylene terephthalate film (barrier layer) (12 μm) / stretched polypropylene film having heat seal layer (adhesive layer) (25 μm),
(3) Unstretched polypropylene film (30 μm) / polyethylene terephthalate film (printing substrate) (12 μm) / silicon oxide evaporated polyethylene terephthalate film (barrier layer) (12 μm) / unstretched polypropylene film (adhesive layer) (30 μm) ,
(4) Stretched polypropylene film (25 μm) / polyethylene terephthalate film (printing substrate) (12 μm) / silicon oxide-deposited polyethylene terephthalate film (barrier layer) (12 μm) / stretched polypropylene film with heat seal layer (adhesive layer) (25 μm),
(5) Unstretched polypropylene film (30 μm) / polyethylene terephthalate film (printing substrate) (12 μm) / aluminum foil (barrier layer) (9 μm) / polyethylene terephthalate film (12 μm) / unstretched polypropylene film (adhesive layer) (30 μm).

  In general, when the side and bottom labels 1, 2 stamped into a predetermined shape are arranged in the female mold 3, the magnitude of the curl of the side and bottom labels 1, 2 affects the yield of injection molding. That is, the smaller the curl of the side and bottom labels 1 and 2, the better the yield.

  In order to reduce the curl of the side and bottom labels 1 and 2, it is preferable that the side and bottom labels 1 and 2 have a symmetrical layer configuration with the center layer as the center.

  In the side and bottom labels 1 and 2 having the layer configurations (1), (2) and (5), a symmetrical layer configuration can be achieved with the center layer as the center. The labels 1 and 2 also have a symmetrical layer structure when the polyethylene terephthalate film and the silicon oxide evaporated polyethylene terephthalate film are considered as one polyethylene terephthalate film. For this reason, curling of the labels 1 and 2 during punching could be reduced. Further, in the case of the labels 1 and 2 having the layer constitutions of (1) to (5), both the gas barrier properties and the adhesion to the injection resin are good.

  Next, a method for manufacturing the in-mold label container will be described with reference to FIGS. First, as shown in FIG. 3 (a), an in-mold label container 10 is formed by a mold comprising a female mold 3 and a male mold 4, and then the male mold 4 separates from the female mold 3 and the male mold 4 and the female mold 4 are separated. A label loading / container removal jig (dummy core) 15 is arranged between the mold 3 and the mold 3 (FIG. 3B).

  In this case, the container 10 is mounted on the male mold 4 side, and then the dummy core 15 approaches the container 10 mounted on the male mold 4 (FIG. 3C). In FIG. 3C, the side surface label 1 and the bottom surface label 2 are previously attracted to the dummy core 15. The side label 1 and the bottom label 2 are mounted in the female mold 3 by the dummy core 15 in a later step.

  Next, as shown in FIG. 3D, the dummy core 15 moves to the female mold 3 side, and the container 10 adsorbed by the suction portion 15a of the dummy core 15 is separated from the male mold 4, and thus the container The removal from the mold 10 is performed. Thereafter, the dummy core 15 enters the female mold 3, and the side label 1 and the bottom label 2 sucked by the dummy core 15 are transferred to the female mold 3.

  Next, as shown in FIG. 3 (e), the dummy core 15 is taken out of the female mold 3, and the dummy core 15 thereafter goes out from between the female mold 3 and the male mold 4 with the container 10 being sucked. In this case, the side label 1 and the bottom label 2 in the female mold 3 are suction-held by the vacuum suction holes 8.

Next, as shown in FIG. 3F, the male mold 4 is pressed against the female mold 3, and the injection resin 7 is injected from the gate 5 of the female mold 3 . The injection resin 7 is injected into the cavity between the female mold 3 and the male mold 4 through the gate hole 6 of the bottom label 2. The injection resin 7 in the cavity presses the side label 1 and the bottom label 2 against the female mold 3 and lowers the peripheral edge 2 a of the bottom label 2. Thus, the in-mold label container 10 is obtained.

Second Embodiment Next, a second embodiment of the present invention will be described with reference to FIGS.

  The in-mold label container shown in FIGS. 2 (a) and 2 (b) is substantially the same as the in-mold label container shown in FIGS. 1 (a) and 1 (b) except that the bottom label is attached to the male side. is there.

  2 (a) and 2 (b), the same parts as those of the in-mold label container shown in FIGS. 1 (a) and 1 (b) are denoted by the same reference numerals, and detailed description is omitted.

  That is, as shown in FIGS. 2A and 2B, the in-mold label container 10 includes a side portion 10a, a bottom portion 10b, and a flange portion 10c. The side portion 10a is composed of the side label 1 and the injection resin 7 injected on the surface of the side label 1, and the bottom portion 10b is formed of the bottom label 2 and the injection resin 7 injected on the surface of the bottom label 2. Has become.

  The bottom label 2 constituting the bottom portion 10b is attached to the lower surface of the male mold 4 and is sucked by the vacuum suction holes 9 provided in the male mold 4. As described above, since the bottom label 2 is attached to the lower surface of the male mold 4, it is not necessary to provide the gate hole 6 (FIG. 4B). The diameter of the bottom label 2 is smaller than the outer diameter C of the side portion 10a on the arrangement surface of the bottom label 2 and larger than the outer diameter D of the bottom portion 10b on the arrangement surface of the bottom label 2.

That is, D <diameter of bottom label <C
It has become.

  Further, the peripheral edge 2a of the bottom label 2 projects outward from the bottom 10b and is lifted upward.

  By making the diameter of the bottom label 2 larger than the outer diameter D of the bottom 10b in this way, even if the bottom label 2 is slightly shifted on the lower surface of the male mold 4, the bottom 10 can sufficiently cover the bottom 10b of the container 10. Can be covered. Therefore, the gas barrier property of the bottom portion 10b can be improved.

  Next, a method for manufacturing the in-mold label container shown in FIGS. 2A and 2B will be described.

  The method of manufacturing the in-mold label container includes a step of attaching the bottom label 2 to the female-side surface of the male mold 4 after the step shown in FIG. )-(F).

  That is, the female die 3 with the side label 1 mounted thereon and the male die 4 with the bottom label 2 mounted thereon are thereafter pressed, and the injection resin 7 is injected from the gate 5 of the female die 3. The injection resin 7 is injected into the cavity between the female mold 3 and the male mold 4, and the injection resin 7 presses the side label 1 against the female mold 3. At the same time, the injection resin 7 presses the bottom label 2 against the male mold 4 and lifts the peripheral edge 2a of the bottom label 2 upward.

  In this embodiment, since the bottom label 2 is attached to the male mold 4, only the side label 1 is attached to the female mold 3 by the dummy core 15.

Modified Examples In the above embodiments, examples were shown in which the bottom label 2 having the gate holes 6 formed was mounted on the female mold 3 side, and then the injection resin 7 was injected from the gate 5 (FIG. 1A). b)), the injection resin 7 may be injected from the gate 5 after the bottom label 2 without the gate hole 6 is attached to the female mold 3 side. In this case, the injection resin 7 injected from the gate 5 separates the bottom label 2 from the female mold 3 side and presses it toward the male mold 4 to lift the peripheral edge 2a of the bottom label 2 upward. The in-mold label container 10 formed in this manner is similar to the container shown in FIGS.

  Also, an example is shown in which the bottom surface label 2 without the gate hole 6 is attached to the male mold 4 side, and then the injection resin is injected from the gate 5 (see FIGS. 2A and 2B). After attaching the label 2 to the male mold 4 side, the injection resin 7 may be injected from the gate 5. In this case, the resin 7 injected from the gate 5 enters the cavity between the female mold 3 and the male mold 4 from the gate hole 6. Thereafter, the injection resin 7 presses the bottom label 2 toward the female mold 3 and lowers the peripheral portion 2a of the bottom label 2 downward. The in-mold label container 10 thus formed is a container similar to FIGS. 1A and 1B.

  Furthermore, the side label 1 and the bottom label 2 having the gate hole 6 are connected in advance to form a cup-shaped label, and the cup-shaped label is mounted in the female mold 3 and then injected from the gate 5. 7 may be injected.

FIG. 1 is a diagram showing a first embodiment of an in-mold label container according to the present invention. The figure which shows 2nd Embodiment of the in-mold label container by this invention. The figure showing the manufacturing method of an in-mold label container. The figure which shows a side surface label and a bottom surface label.

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 1 Side label 2 Bottom label 3 Female type 4 Male type 5 Gate 6 Gate hole 7 Injection resin 10 In-mold label container 10a Side part 10b Bottom part 10c Flange part 11 Thread part 12 Notch

Claims (2)

In an in-mold label container having a side portion having a threading portion below and a bottom portion provided inside the upper portion of the threading portion of the side portion,
Each including a barrier layer, a bottom label corresponding to the bottom, and an in-mold label having a side label corresponding to the side,
With the injection resin injected on the surface of this in-mold label,
The side label has a shape obtained by removing a small sector having the same center as the large sector from a large sector, and a cutout portion is formed at a lower part of both side edges of the shape of the side label. In-mold label container.   An in-mold label container characterized in that the cutout portion extends to a portion corresponding to a side thread portion.

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