JP4647498B2 - In-mold container - Google Patents

Description

  The present invention relates to an in-mold container having a label and molded from an injection resin, and an apparatus for manufacturing the same.

  2. Description of the Related Art Conventionally, as an in-mold container, there is known a container that includes a body portion having a flange portion and a bottom portion connected to the body portion, and a label is disposed on the body portion and is molded from an injection resin.

  In such an in-mold container, the body surface is finished flat in consideration of moldability.

  As described above, the body part of the in-mold container is finished flat. However, simply by finishing the body part flat, it is not possible to improve the design or eliminate similar products.

  The present invention has been made in consideration of such points, and it is intended to provide an in-mold container and an apparatus for manufacturing the same that can improve designability and can effectively eliminate similar products. Objective.

  The present invention relates to an in-mold container that includes a barrel having a flange and a bottom connected to the barrel, and is formed by arranging a label on the barrel, and includes a plurality of recesses and / or a plurality of recesses on the outer surface of the barrel. The convex part is provided, and the concave part and / or the convex part are continuously arranged.

In the present invention, the body portion is formed in a divergent shape at an angle θ from the bottom portion toward the flange portion side, and the convex portion has an inclination angle θ ₁ equal to or less than the angle θ on the flange portion side. It is a mold container.

The present invention is characterized in that the body part is formed in a divergent shape at an angle θ from the bottom part toward the flange part side, and the concave part has an inclination angle θ ₂ of the angle θ or less on the bottom part side. It is.

  The present invention is the in-mold container, wherein the plurality of concave portions and / or the plurality of convex portions are formed in the entire region of the outer surface of the trunk portion.

  The present invention is the in-mold container, wherein the plurality of concave portions and / or the plurality of convex portions are formed in a partial region of the outer surface of the body portion.

  In the present invention, the plurality of concave portions and / or the plurality of convex portions are provided in multiple stages from the lower portion to the upper portion of the outer surface of the trunk portion, and the number of concave portions and / or convex portions in each step is the same. An in-mold container.

  The present invention is characterized in that the body portion is formed in a divergent shape at an angle θ from the bottom portion toward the flange portion, and the shape of the concave portion and / or the convex portion is gradually enlarged from the lower portion toward the upper portion. It is an in-mold container.

  The present invention is an in-mold container in which a label is printed with ink, and the ink contains a polarized pearl pigment.

The present invention includes a trunk portion having a flange portion and a bottom portion coupled to the trunk portion, and is formed by arranging a label on the trunk portion, and the trunk portion is formed at an angle θ from the bottom portion toward the flange portion side. In an in-mold container manufacturing apparatus formed in a divergent shape, a die is provided, and a groove corresponding to a convex portion provided on the outer surface of the body portion is formed in the die, and the groove portion has an angle θ or less on the flange portion side. it has an inclined angle theta ₁ is a manufacturing apparatus for in-mold container, wherein.

The present invention includes a trunk portion having a flange portion and a bottom portion coupled to the trunk portion, and is formed by arranging a label on the trunk portion, and the trunk portion is formed at an angle θ from the bottom portion toward the flange portion side. In an in-mold container manufacturing apparatus formed in a divergent shape, a mold is provided, and a protrusion corresponding to a recess provided on the outer surface of the body is formed on the mold, and the protrusion has an angle θ or less on the bottom side. it has an inclined angle theta ₂ is a manufacturing apparatus for in-mold container, wherein.

  The present invention includes a trunk portion having a flange portion and a bottom portion coupled to the trunk portion, and is formed by arranging a label on the trunk portion, and the trunk portion is formed at an angle θ from the bottom portion toward the flange portion side. In the in-mold container manufacturing apparatus formed in a divergent shape, a mold is provided, and the mold is provided with a plurality of concave portions provided on the outer surface of the body portion and / or a sliding mold corresponding to the plurality of convex portions, This sliding mold is an in-mold container manufacturing apparatus characterized by being slidable outward in the mold.

  The present invention includes an in-mold container that includes a body portion having a flange portion and a bottom portion coupled to the body portion, and is formed by arranging a label on the body portion, and the outer surface of the body portion is 2 along the circumferential direction. An in-mold container characterized in that a non-smooth portion comprising a plurality of recesses and / or a plurality of projections is provided in at least one partition region on the outer surface of the body part.

  The present invention is the in-mold container characterized in that the non-smooth portion in a certain partition region is separated from the non-smooth portion in the adjacent partition region and the smooth portion therebetween.

  The present invention is the in-mold container characterized in that the non-smooth part is formed leaving the smooth part provided in the upper part and the lower part of the trunk part.

  The present invention is the in-mold container, wherein the non-smooth part is formed leaving the smooth part provided in the lower part of the body part, and the stack rib is provided in the smooth part below the non-smooth part.

  The present invention is the in-mold container characterized in that the volume per unit area of the non-smooth part in the body part is equal to the volume per unit area of the smooth part in the same height region as the non-smooth part.

  The present invention is the in-mold container, wherein the smooth portion in the same height region as the non-smooth portion has a thick portion protruding outward in the radial direction.

  The present invention is the in-mold container, wherein the smooth part in the same height region as the non-smooth part has a thick part protruding inward in the radial direction.

  The present invention is an in-mold container characterized in that the non-smooth part is formed leaving a smooth part provided in the upper part of the body part, and a vacuum hole mark is formed in the smooth part above the non-smooth part. is there.

  In the present invention, the outer surface of the body portion is partitioned into three regions along the circumferential direction, and the non-smooth portions are provided in the other partition regions, leaving the smooth portions provided in at least one partition region. It is an in-mold container characterized.

  As described above, according to the present invention, a large number of concave portions or convex portions can be formed on the body surface of the in-mold container easily and reliably. For this reason, the in-mold container which is excellent in design property and can exclude a similar product can be obtained.

The figure which shows 1st Embodiment of the in-mold container by this invention, and its manufacturing apparatus. The external view of an in-mold container. The figure which shows the injection mold which shape | molds an in-mold container. The figure which shows the blow molding die which shape | molds an in-mold container. The figure which shows the sheet | seat shaping die which shape | molds an in-mold container. The figure which shows 2nd Embodiment of the in-mold container by this invention, and its manufacturing apparatus. The figure which shows 3rd Embodiment of the in-mold container by this invention, and its manufacturing apparatus. The figure which shows 5th Embodiment of the in-mold container by this invention. The top view which shows an in-mold container. The bottom view which shows an in-mold container. Sectional drawing which shows an in-mold container. The figure which shows the manufacturing method of an in-mold container.

DESCRIPTION OF EXEMPLARY EMBODIMENTS First Embodiment Hereinafter, an embodiment of the invention will be described with reference to the drawings. FIGS. 1A and 1B, FIGS. 2A to 2C, and FIG. 3 are views showing a first embodiment of the present invention.

  As shown in FIGS. 1A and 1B and FIG. 2A, the in-mold container 10 includes a cylindrical body portion 11 having a flange portion 12 and a bottom portion 13 connected to the body portion 11, An injection resin 21 is injected into the label 20 disposed on the body 11 and molded.

Of these, as label 20,
OPP30 / LMD / PET12 / GR / LMD / AL7 / LMD / HS-OPP30
Can be used.

Each layer of the laminate is
HS-OPP: Biaxially stretched polypropylene film having a heat seal layer LMD: Dry laminate PET: Polyethylene terephthalate GR: Gravure printing (math unit is μm).

  In this case, the ink used for gravure printing may contain a polarized pearl pigment. Since the polarized pearl pigment has dichroism, unlike conventional white pearl, printing with increased depth can be performed. In this way, by using the label 20 printed with the ink containing the polarized pearl pigment, in combination with the concave portion 15 and the convex portion 16 of the container 10 which will be described later, the hue varies depending on the viewing angle, and the appearance is further increased in depth. And can be differentiated from other containers.

  Further, as the injection resin 21, high density polyethylene (HDPE), polypropylene (PP), polystyrene (PS), polycarbonate (PC), or the like can be used.

  Further, as shown in FIGS. 1A and 1B and FIG. 2A, a large number of concave portions 15 and a large number of convex portions 16 are continuously provided on the outer surface of the body portion 11 of the in-mold container 10, respectively. Yes. The concave portion 15 and the convex portion 16 are continuously connected to each other, or are provided independently and continuously. The concave portions 15 and the convex portions 16 improve the design of the in-mold container 10 and eliminate similar products.

  Further, by providing a large number of concave portions 15 and convex portions 16 in this way, the in-mold container 10 can be provided with heat insulation properties. For example, even if hot water of 70 ° C. is put in the in-mold container 10, the container 10 is manually held. Can have.

  Here, FIG. 1A is an overall view of the in-mold container 10, and FIG. 1B is an enlarged view of the in-mold container 10.

  A large number of concave portions 15 and a large number of convex portions 16 provided on the outer surface of the body portion 11 are combinations of a large number of quadrangular pyramid-shaped convex portions 16 and the concave portions 15 between the convex portions 16 as shown in FIG. It is made up of. Moreover, although the recessed part 15 and the convex part 16 are formed in the whole region of the outer surface of the trunk | drum 11, you may form in the one part area | region among the outer surfaces of the trunk | drum 11.

  Further, the concave portions 15 and the convex portions 16 are provided in multiple stages from the lower portion toward the upper portion of the outer surface of the body portion 11, and the number of the concave portions 15 and the convex portions 16 in each step, that is, the concave portions in the circumferential direction of each step. The number of 15 and the convex part 16 is the same. For this reason, the shape of the concave part 15 and the convex part 16 in each step is gradually enlarged from the lower part toward the upper part.

  As shown in FIG. 2B, a large number of small concave portions 15 and convex portions 16 may be arranged on the outer surface of the trunk portion 11. In FIG. 2B, each convex portion 16 is formed of a quadrangular pyramid, and the concave portion 15 is formed between the convex portions 16.

  In addition, as shown in FIG.2 (c), you may form only many hemispherical recessed parts 16 in the trunk | drum 11 outer surface.

  2 (a) and 2 (b), an example in which the convex portion 16 of the quadrangular pyramid is formed on the outer surface of the body portion 11 is shown. The recessed part 15 in between may be formed, and the recessed part 15 between the cone-shaped convex part 16 and the convex part 16 may be formed.

  Furthermore, the convex part 16 of a truncated pyramid frustum and the recessed part 15 between the convex parts 16 may be formed in the outer surface of the trunk | drum 11, and also between the convex part 16 formed with the straight line or the curve, and the convex part 16 A recess 15 may be formed.

The body portion 11 of the in-mold container 10 is formed in a divergent shape at an angle θ from the bottom portion 13 toward the flange portion 12 side. Moreover, the recessed part 15 has the inclination part 15a in the bottom part 13 side, and inclination | tilt angle (theta) _{2 with} respect to the trunk | drum 11 of this inclination part 15a is below angle (theta). Furthermore protrusion 16 has an inclined portion 16a in the flange portion 12 side, tilt angle theta ₁ with respect to the body portion 11 of the inclined portion 16a is equal to or less than the angle theta.

The in-mold container 10 described above is formed by a manufacturing apparatus having an injection mold composed of a male mold 1 and a female mold 2, and the female mold 2 of the manufacturing apparatus has a recess provided on the outer surface of the body 11. Projections 5 and grooves 6 are provided corresponding to 15 and the protrusions 16, respectively. Moreover, the protrusion part 5 has the inclination part 5a in the bottom part 13 side, and inclination | tilt angle (theta) _{2 with} respect to the trunk | drum 11 of this inclination part 5a is below angle (theta). Further groove 6 has an inclined portion 6a in the flange portion 12 side, tilt angle theta ₁ with respect to the body portion 11 of the inclined portion 6a is equal to or less than the angle theta.

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

  First, the label 20 is placed in the female mold 2, and then the male mold 1 is inserted into the female mold 2. Next, an injection resin 21 is injected between the male mold 1 and the female mold 2 from the gate 8 provided in the female mold 2. As a result, the in-mold container 10 is obtained.

Next, the male mold 1 is separated from the female mold 2 with the in-mold container 10 provided, and then the in-mold container 10 is pulled away from the male mold 1. In this case, the trunk portion 11 is formed in a divergent shape at an angle θ toward the flange portion 12, and the inclined portion 15 a of the concave portion 15 and the inclined portion 5 a of the protruding portion 5 are each less than the angle θ with respect to the trunk portion 11. because having a tilt angle theta _2, the inclined portion 15a, a divergent toward 5a thong flange portion 12 side (the angle θ- inclined portion 15a, the inclination angle of 5a theta _2).

  Therefore, when the in-mold container 10 is pulled away from the female mold 2, the in-mold container 10 is not caught on the inclined portion 5 a of the protruding portion 5.

Similarly for having an inclined portion 6a inclination angle theta ₁ of the following angle theta with respect to each body part 11 of the inclined portion 16a and the groove 6 of the convex portion 16, when detaching the in-mold container 10 from the female mold 2, in The mold container 10 is not caught on the inclined part 6 a of the groove part 6.

For example, in FIGS. 1A and 1B, when the thickness T of the body 11 is 0.8 mm, the depth D of the recess 15 is 0.2 mm, and θ = 6 °,
The length X of the inclined portion 15a is X ≧ 0.2 / sin 6 ° = 1.91 mm.

  In the above embodiment, the example in which the injection resin 21 is injected into the injection mold composed of the male mold 1 and the female mold 2 to mold the in-mold container 10 is shown (FIG. 3). For example, the in-mold container 10 may be molded by blow molding using a blow molding apparatus having blow molding dies 31 and 32 as shown in FIG. 4 and a blow nozzle 33 protruding from the mold 31.

  As shown in FIG. 4, the label 20 and the container material 34 are arranged in the mold 32, and the in-mold container 10 is obtained by blowing air from the blow nozzle 33 toward the container material 34.

  In addition, as shown in FIG. 5, the in-mold container 10 may be molded by sheet molding using a sheet molding apparatus having a sheet molding die including a presser box 41 and a female mold 42.

  As shown in FIG. 5, the label 20 is disposed in the female mold 42, and the sheet material 43 is sandwiched between the presser box 41 and the female mold 42, and thus the in-mold container 10 is obtained.

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

  The second embodiment shown in FIG. 6 is different in the shape of the concave portion 15 and the convex portion 16 provided in the body portion 11, and the others are shown in FIGS. 1A and 1B and FIGS. c) and substantially the same as the first embodiment shown in FIG.

6, the body portion 11 is formed in a divergent shape at an angle theta toward the flange portion 12 side, the recess 15 have the inclined portion 15a having an inclination angle theta ₂ with respect to the bottom portion 13 side to the angle theta following barrel 11 is doing. Moreover, the convex part 16 has the inclination part 16a which has inclination | tilt angle (theta) ₁ with respect to the trunk | drum 11 below angle (theta) in the flange part 12 side.

Third Embodiment Next, a third embodiment of the present invention will be described with reference to FIG.

  In the embodiment shown in FIG. 7, the concave portion 15 and the convex portion 16 are provided in the body portion 11, the concave portion 15 has an inclined portion 15a on the bottom portion 13 side, and the convex portion 16 has an inclined portion 16a on the flange portion 12 side. Have.

In FIG. 7, the in-mold container manufacturing apparatus has an injection mold composed of a male mold 1 and a female mold 2, and the female mold 2 is provided with a sliding mold 2a that can move outward. The concave portion 15 is formed by the protruding portion 5 of the sliding mold 2a, and the convex portion 16 is formed by the groove portion 6 of the sliding die 2a. The sliding mold 2a having the protruding portions 5 and the groove portions 6 can slide outward in the female mold 2 as described above. Therefore, the inclination angles θ ₂ and θ ₁ of the inclined portion 15a of the concave portion 15 and the inclined portion 16a of the convex portion 16 with respect to the trunk portion 11 do not have to be equal to or less than the divergent angle θ of the trunk portion 11 formed in a divergent shape. That is, even if the inclination angles θ ₂ and θ ₁ of the inclined portion 15a of the concave portion 15 and the inclined portion 16a of the convex portion 16 with respect to the body portion 11 are set to be equal to or larger than the angle θ, the sliding mold 2a having the protruding portion 5 and the groove portion 6 is When the in-mold container 10 is taken out from the female mold 2 by sliding outward in the mold 2, the protruding portion 5 or the groove 6 of the sliding mold 2 a is not caught on the in-mold container 10.

  In FIG. 7, the female mold 2 is provided with a suction slit 4 on the label, and a gate 8 is provided at the bottom of the female mold 2.

Fourth Embodiment Next, a fourth embodiment of the present invention will be described.

  The fourth embodiment is different from the first embodiment shown in FIGS. 1 to 3 in that the configuration of the label 20 is different.

  The label 20 used in the present invention has a side label and a bottom label, and is generally composed of an adhesive layer with a printing substrate layer, a gas barrier layer, and an injection resin. Each of these layers can be formed by independently forming a film and bonding (dry lamination) via an adhesive, or by melt extrusion (EC, coextrusion) of a part or all of the layer. . Moreover, a printing base material layer can also be abbreviate | omitted according to a use and the objective.

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

  Examples of the gas barrier layer include (a) aluminum foil (7 to 25 μm), (b) a metal or metal oxide layered on a plastic film by vapor deposition or the like, for example, silicon oxide vapor deposition plastic film, aluminum oxide vapor deposition Plastic film, aluminum vapor-deposited plastic film, (c) other, polyacrylonitrile resin, EVOH (ethylene vinyl acetate copolymer saponified product), PVDC (polyvinylidene chloride) film, PVDC-coated biaxially stretched plastic film, etc. It can be suitably selected according to the desired performance.

  The adhesive layer is not particularly limited as long as it adheres to the injection resin. Usually, the adhesive resin such as plastic containing the same material as the injection resin and polyethylene containing EVA (ethylene / vinyl acetate copolymer) is used. Alternatively, a plastic film or the like in which these resins are coextruded or coated can be preferably 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.

  In the in-mold label container body of the present invention, an injection-moldable thermoplastic resin such as polypropylene, polyethylene, or polystyrene can be used.

[Example]
Hereinafter, specific examples of the present invention will be described.

<First embodiment>
In the first embodiment of the present invention, polypropylene is used as the material of the injection resin 21 to be the in-mold container 10, and the label 20 is polyethylene terephthalate film (12 μm) / aluminum foil (15 μm) / polypropylene film (60 μm) 3. A film in which layers were sequentially laminated was used. This label 20 is printed on the PET film, which is the outermost layer, with letters, patterns, etc., laminated with an aluminum foil, which is a barrier layer, using an adhesive, and then, with an adhesive, the polypropylene film, which is the innermost layer. A laminated three-layer film was formed and punched into a predetermined shape (a side label was a fan shape and a bottom label was a circle having a gate hole in the center).

  Next, this label material (having side labels and bottom labels) is placed on the side and bottom surfaces of the female mold 2 and the male mold 1 is pushed in from above, and then the gate 8 (and the gate hole of the bottom label corresponding to the gate position). The resin 21 was injected into the cavity through a normal in-mold label injection molding.

  As a result of measuring the barrier characteristics of the obtained molded container, values of oxygen permeability and moisture permeability as shown in Table 1 were obtained.

  Since the innermost layer of this label is the same material as the resin of the container body, the label and container body could be integrated without using an adhesive. The aluminum foil of the label 20 appears on the appearance of the in-mold container 10. In addition to the metallic view of the aluminum foil, the appearance of the concave portion 15 and the convex portion 16 provided in the body portion 11 could be differentiated from conventional containers.

In addition, while using polypropylene as a material of the injection resin used as a container main body, the film which consists of the following layer structures was used in order from the outermost side to the innermost side besides the above as a label material.
(1) Stretched polypropylene film (printing substrate) (25 μm) / aluminum foil (barrier layer) (15 μm) / stretched polypropylene film (adhesive layer) having a 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 (adhesive layer) having a heat seal layer (25 μm),
(3) Unstretched polypropylene film (30 μm) / polyethylene terephthalate film (printing substrate) (12 μm) / silicon oxide-deposited 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) / Si oxide-deposited polyethylene terephthalate film (barrier layer) (12 μm) / Stretched polypropylene film (adhesive layer) with heat seal 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 label 20 is disposed on the side surface and the bottom surface of the female mold 2 after the label 20 is punched into a predetermined shape, the size of the curl of the label 20 affects the yield of injection molding. That is, the smaller the curl of the label 20, the better the yield.

  Further, in order to reduce the curl of the label 20, it is preferable that the layer structure of the label 20 is an object type layer structure centered on the center layer.

  In the label 20 having the layer configuration of (1), (2), and (5) above, a symmetric layer configuration can be formed around the center layer, and the label materials of (3) and (4) are also polyethylene terephthalate. When a film and a silicon oxide vapor-deposited polyethylene terephthalate film are considered as one polyethylene terephthalate film, a symmetrical layer structure is obtained. For this reason, curling of the label 20 at the time of punching could be reduced. In addition, in the case of the label 20 having the layer configuration of (1) to (5), the gas barrier characteristics and the adhesiveness with the injection resin were all good.

<Second embodiment>
In the second embodiment of the present invention, a label 20 similar to that of the first embodiment is used, and a circular bottom label 20 having no gate hole is inserted into the center of the bottom label of the label 20 to insert the label. Mold label injection molding was performed. In this embodiment, since there is no gate hole in the bottom label, when the resin 21 is injected, the resin is filled in the cavity with the bottom label pressed against the core (male) side. Therefore, in the molded product, a label having no gate hole is laminated on the bottom surface in the container, and the barrier characteristics are further improved (see Table 2). In addition, in this embodiment, when a gate hole is provided in the bottom label (because a hole punching process is required after the outer periphery of the label is punched, accuracy of outer periphery punching and hole punching is required, and a high precision punching machine is required. The processing of the label material becomes easier compared to

<Third embodiment>
In the third embodiment of the present invention, the same label 20 as that in the first embodiment is used, and a female mold 2 in which a vacuum suction hole is provided at a position where the bottom surface cavity and the side surface cavity intersect is used for in-molding. Label injection molding was performed. In this embodiment, it is possible to prevent the side label from being blown when the resin is injected, so that the side label 1 after molding can be prevented from wrinkling and overlapping.

<Fourth embodiment>
In the fourth embodiment of the present invention, the same label 20 as in the first embodiment is used, and the total height (exactly, the length along the side wall) LH of the side cavity of the mold is used as the female mold. When the inner circumference is LR (however, it gradually decreases from the top to the bottom), the height L1 and the circumferential length L2 of the side label are L1 = LH-1 and L2 = LR-1 (mm), respectively. In-mold label injection molding was performed. In the present embodiment, since the label size is set short, the occurrence of wrinkles, overlapping, etc. can be prevented. In particular, after the side label is inserted into the female mold 2, the lower end of the label does not come into contact with the bottom of the side cavity when the female mold 1 is pushed in, so that the label is laminated in close contact with the container body without undulation. As a result, the obtained in-mold container 10 is laminated with a predetermined gap in the side label, but has little influence on the gas barrier property.

<Fifth embodiment>
In the fifth embodiment of the present invention, the same label 20 as in the first embodiment is used, and a reinforcing rib extending in the vertical direction is provided at a predetermined position of the body portion 11 of the in-mold container 10 to perform in-mold. Label injection molding was performed. With this reinforcing rib, it is possible to prevent peeling of the label due to a difference in shrinkage due to a difference in material between the in-mold container 10 and the label.

  In particular, in the case of a rectangular container, it is preferable to provide ribs at the center points of the four sides of the leg portion.

<Sixth embodiment>
In the sixth embodiment of the present invention, a polystyrene resin is used as an injection resin to be a container body, and a coextruded film (thickness) having a layer structure of polypropylene / adhesive / polyvinylidene chloride / adhesive / polypropylene as a label 20. 60 μm), printing was performed on the innermost layer side of the label, and an EVA resin (heat sealing agent) was further coated thereon by a gravure coating method. Then, in-mold label injection molding was performed using the molds (female mold 2 and male mold 1) having a curvature corresponding to the portion where the bottom cavity and the side cavity intersect. Since the curvature is given to the mold, the resin injection pressure to the label 20 is reduced, and the “ink” and heat seal layer of the label can be prevented from “flowing” due to friction or the like. In addition, in the said part, it becomes comparatively thick, and it is preferable to keep it as 1.5 times or less in order to prevent the "sink" resulting from the difference in thickness after cooling.

Fifth Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIGS. 8 (a), 8 (b), 9, 10, 11 and 12 are views showing a fifth embodiment of the present invention.

  As shown in FIGS. 8A and 8B to FIG. 12, the in-mold container 10 includes a cylindrical body part 11 having a flange part 12 and a bottom part 13 connected to the body part 11, and the body part 11. The injection resin 21 is injected into the label 20 disposed on the label 20 and molded.

Of these, as label 20,
OPP30 / PET12 / GR / AL7 / HS-OPP30
Can be used.

Each layer of the laminate is
OPP: Biaxially oriented polypropylene film PET: Polyethylene terephthalate GR: Gravure printing AL: Aluminum layer (numerical unit is μm).

  In this case, the ink used for the gravure printing of the label 20 may include a polarized pearl pigment. Since the polarized pearl pigment has dichroism, unlike conventional white pearl, printing with increased depth can be performed. In this way, by using the label 20 printed with the ink containing the polarized pearl pigment, in combination with the concave portion 15 and the convex portion 16 of the container 10 which will be described later, the hue varies depending on the viewing angle, and the appearance is further increased in depth. And can be differentiated from other containers.

  Further, as the injection resin 21, high density polyethylene (HDPE), polypropylene (PP), polystyrene (PS), polycarbonate (PC), or the like can be used. Details of the injection resin will be described later.

  Further, as shown in FIGS. 8A and 8B, a large number of concave portions 15 and a large number of convex portions 16 are continuously provided on the outer surface of the body portion 11 of the in-mold container 10. The concave portion 15 and the convex portion 16 are continuously connected to each other, or are provided independently and continuously. The concave portions 15 and the convex portions 16 improve the design of the in-mold container 10 and eliminate similar products.

  Further, by providing a large number of concave portions 15 and convex portions 16 in this way, the in-mold container 10 can be provided with heat insulation properties. For example, even if hot water of 70 ° C. is put in the in-mold container 10, the container 10 is manually held. Can have.

  Here, FIG. 8A is a front view of the in-mold container 10, and FIG. 8B is a rear view of the in-mold container 10.

  A large number of concave portions 15 and a large number of convex portions 16 provided on the outer surface of the body portion 11 include a large number of quadrangular pyramidal convex portions 16 and the concave portions 15 between the convex portions 16 as shown in FIGS. It consists of a combination.

As shown in FIGS. 8 (a), 8 (b), 9 and 10, the many concave portions 15 and the many convex portions 16 provided on the outer surface of the body portion 11 are non-smooth portions 50 whose surfaces are non-smooth. Is configured. That is, the outer surface of the body 11 is divided into two or more, for example, three regions L ₁ , L ₂ , and L ₃ along the circumferential direction, and the three partitioned regions (hereinafter referred to as regions) L ₁ , L ₂ , and L ₃ are divided. among the non-smooth portion 50 comprising a region _{L 1} and _{L 2} in the recess 15 and the convex portion 16. it is formed. A portion other than the non-smooth portion 50 on the outer surface of the body portion 11 is a smooth portion 51 having a smooth surface.

In addition, the non-smooth portions 50 provided in the region L ₁ and the region L ₂ are separated from each other with the smooth portion 51 interposed therebetween. In this case, the smoothing unit 51 is composed of a smoothing unit 51a between the region _{L 1} and the region _{L 2,} a region _{L 3} where the non-smoothing unit 50 is not present and the smoothing portion 51b.

In region L ₁ and L ₂ of the non-flat portion 50 is formed, the non-smooth portion 50 the upper portion and lower portion and a smooth portion 51c provided in, and is formed by leaving respectively 51d.

  Thus, by providing the non-smooth part 50 in the outer surface of the trunk | drum 11, the design property of the in-mold container 10 can be improved as mentioned above, and the in-mold container 10 can be provided with heat insulation.

  Further, by forming the smooth portion 51 between the non-smooth portions 50 on the outer surface of the body portion 11, the content information (component information) of the in-mold container 10 can be printed on the smooth portion 51, and the smooth portion 51. Can be barcode printed. Furthermore, by providing the non-smooth part 50 and the smooth part 51 on the outer surface of the body part 11, the design of the in-mold container 10 can be further improved by comparing the non-smooth part 50 and the smooth part 51.

In the above embodiment, the outer surface of the body portion 11 is divided into three regions L ₁ , L ₂ , L ₃ along the circumferential direction, and the non-smooth portion 50 is provided only in the regions L ₁ , L _2. , an example not provided with the non-smooth portion 50 in the area L _3, the body portion 11 the outer surface of two or more regions (two regions, three regions, four regions, five regions) as well as divided into, The non-smooth part 50 can be provided in at least one area among the partitioned areas, and the smooth part 51 can be provided in another area.

  Further, the body portion 11 of the in-mold container 10 is provided with a stack rib 11a extending in the circumferential direction at a lower portion on the inner surface thereof. For this reason, when the in-mold containers 10 are stacked and stored, the yarn twisting portion 14 of the upper in-mold container 10 is placed on the stack rib 11a of the lower in-mold container 10, so that both in-mold containers 10 The container 10 does not adhere. Thereby, the upper in-mold container 10 can be easily pulled out from the lower in-mold container 10.

  In addition, a vacuum hole mark 11 b extending in the circumferential direction is provided in an upper part of the outer surface of the body part 11.

  As will be described later, when the in-mold container 10 is manufactured, the label 20 is disposed in the male mold 1 and the female mold 2, and then the injection resin 21 is injected between the male mold 1 and the female mold 2. The female mold 2 is provided with a vacuum hole (suction slit) 4 for label adsorption, and a vacuum hole mark 11b is formed on the outer surface of the in-mold container 10 by the vacuum hole 4 (see FIG. 12).

As described above, in the present embodiment, out of the regions L ₁ , L ₂ , and L _{3 on} the outer surface of the trunk portion 11, the non-smooth portion 50 is formed in the regions L ₁ and L ₂ , and the non-smooth portion 50 Smoothing portions 51c and 51d are respectively provided in the upper portion and the lower portion (see FIG. 8). In the present invention, the stack rib 11 a on the inner surface of the trunk portion 11 is provided on the smooth portion 51 d below the non-smooth portion 50 of the trunk portion 11, and the vacuum hole mark 11 b is a smooth portion above the non-smooth portion 50 of the trunk portion 11. 51c (FIG. 12).

  In general, the female mold 2 may be divided in the vertical direction with the suction slit 4 as a boundary. If the non-smooth part 50 overlaps with the suction slit 4, when the female mold 2 above the suction slit 4 and the female mold 2 below the suction slit 4 are displaced in the rotation direction, the non-smooth part 50 is formed with high accuracy. It is difficult. According to the present invention, since the suction slit 4 is separated from the non-smooth portion 50, the formation of the non-smooth portion 50 is not hindered by the suction slit 4.

  Moreover, since the stack rib 11a provided in the inner surface of the trunk | drum 11 leads to the increase in thickness, the cooling efficiency at the time of the injection molding of the in-mold container 10 falls. Since the non-smooth part 50 of the trunk | drum 11 is also considered to lead to the increase in thickness, if the stack rib 11a and the non-smooth part 50 overlap, the cooling efficiency at the time of injection molding of the in-mold container 10 will fall more. End up. According to the present invention, since the stack rib 11a is separated from the non-smooth portion 50, it is possible to prevent the cooling efficiency of the in-mold container 10 from being lowered.

  By the way, the trunk | drum 11 in which the non-smooth part 50 was formed becomes thick by the convex part 16 among the non-smooth parts 50 especially. For this reason, at the time of manufacturing the in-mold container 10, the injection resin 21 flowing from the gate 8 easily flows to the non-smooth part 50 side and is injected to the non-smooth part 51 a side at the same height as the non-smooth part 50. It is considered that the problem that the resin 21 does not flow so much occurs (FIG. 8).

  If an imbalance occurs in the flow of the injection resin 21 in the body portion 11 in this way, the label 20 moves from the correct position when the in-mold container 10 is manufactured, and the in-mold container 10 can be manufactured with high accuracy. Disappear.

  In the present embodiment, the thickness of the smooth portions 51a and 51b in the same height region as the non-smooth portion 50 is increased so that the volume per unit area of the smooth portions 51a and 51b and the unit area of the non-smooth portion 50 are increased. Match per volume. For this reason, the thick portions 11c protruding inward in the radial direction are provided in the smooth portions 51a and 51b in the same height region as the non-smooth portion 50. The thick portion 11c extends in the circumferential direction by the same circumferential length as the smooth portions 51a and 51b, thereby increasing the thickness of the smooth portions 51a and 51b.

  Instead of providing the thick portion 11c protruding inward in the radial direction on the body portion 11, a thick portion protruding outward in the radial direction may be provided. In this case, it is preferable in terms of appearance to provide the thick portion 11c protruding inward.

  The thickness of the thick portion 11c is determined as follows. For example, when the thick part 11c is not provided, if the smooth part 51a has a thickness of 0.79 mm, the smooth part 51a has a width of 6.2 mm, and the smooth part 51a has a height of 65 mm, the smooth part 51a has a volume of 0.32 cc. Become.

  On the other hand, the non-smooth part 50 has a volume of 8 convex parts 16 provided on the body 11 of the same area in addition to the above volume 0.32 cc, and the volume of the convex parts 16 is 0.0026. 0.32cc + 0.0026 × 8 = 0.34cc.

  Therefore, the thickness of the thick portion 11c is based on the difference between the volume 0.34cc of the non-smooth portion 50 and the volume 0.32cc of the smooth portion 51a, that is, 0.34cc−0.32cc = 0.02cc. Increased by 0.05 mm.

  In this way, the volume per unit area of the non-smooth part 50 and the volume per unit area of the smooth parts 51a and 51b in the same height region as the non-smooth part 50 can be made the same. Thereby, the injection resin 21 flowing in from the gate 8 is fed in a well-balanced manner to the non-smooth part 50 and the smooth parts 51a and 51b in the same height region as the non-smooth part 50, thereby allowing the injection resin 21 to flow in a well-balanced manner. it can. For this reason, the label 20 does not move when the in-mold container 10 is manufactured, and the in-mold container 10 can be manufactured with high accuracy.

Here smoothing section 51a in the non-smoothing unit 50 in the same height region, and 51b, smoothing portion between the non-smooth portion 50 provided on the non-smooth portion 50 and an area L ₂ provided in the region L ₁ a 51a, refers to the smooth portion 51a of the region having the non-smooth portion 50 of the same height and the smooth portion 51b of the region having the non-smooth portion 50 and the same height as a smooth portion 51b of the region L ₃ Say.

  As shown in FIGS. 8 (a) and 8 (b), the concave portion 15 and the convex portion 16 constituting the non-smooth portion 50 provided on the outer periphery of the trunk portion 11 are directed from the lower portion to the upper portion of the outer surface of the trunk portion 11. The number of concave portions 15 and convex portions 16 in each step, that is, the number of concave portions 15 and convex portions 16 in the circumferential direction of each step is the same. For this reason, the shape of the recessed part 15 and the convex part 16 in each step | paragraph is gradually expanded toward the upper part from the lower part.

  8A and 8B, an example in which the convex portion 16 of the quadrangular pyramid is formed on the outer surface of the body portion 11 is shown, but not limited to this, the convex portion 16 and the convex portion of the triangular pyramid and other polygonal pyramids 16 may be formed, and the conical convex part 16 and the concave part 15 between the convex parts 16 may be formed.

  Furthermore, the convex part 16 of a truncated pyramid frustum and the recessed part 15 between the convex parts 16 may be formed in the outer surface of the trunk | drum 11, and also between the convex part 16 formed with the straight line or the curve, and the convex part 16 A recess 15 may be formed.

The body portion 11 of the in-mold container 10 is formed in a divergent shape at an angle θ from the bottom portion 13 toward the flange portion 12 side. Moreover, the recessed part 15 has the inclination part 15a in the bottom part 13 side, and inclination | tilt angle (theta) _{2 with} respect to the trunk | drum 11 of this inclination part 15a is below angle (theta). Furthermore protrusion 16 has an inclined portion 16a in the flange portion 12 side, tilt angle theta ₁ with respect to the body portion 11 of the inclined portion 16a is equal to or less than the angle theta.

As shown in FIG. 12, the in-mold container 10 described above is formed by a manufacturing apparatus having an injection mold including a male mold 1 and a female mold 2. The protrusions 5 and the grooves 6 are provided corresponding to the recesses 15 and the protrusions 16 provided on the outer surface, respectively. Moreover, the protrusion part 5 has the inclination part 5a in the bottom part 13 side, and inclination | tilt angle (theta) _{2 with} respect to the trunk | drum 11 of this inclination part 5a is below angle (theta). Further groove 6 has an inclined portion 6a in the flange portion 12 side, tilt angle theta ₁ with respect to the body portion 11 of the inclined portion 6a is equal to or less than the angle theta.

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

  First, the label 20 is placed in the female mold 2, and then the male mold 1 is inserted into the female mold 2. Next, an injection resin 21 is injected between the male mold 1 and the female mold 2 from the gate 8 provided in the female mold 2. As a result, the in-mold container 10 is obtained.

Next, the male mold 1 is separated from the female mold 2 with the in-mold container 10 provided, and then the in-mold container 10 is pulled away from the male mold 1. In this case, the trunk portion 11 is formed in a divergent shape at an angle θ toward the flange portion 12, and the inclined portion 15 a of the concave portion 15 and the inclined portion 5 a of the protruding portion 5 are each less than the angle θ with respect to the trunk portion 11. because having a tilt angle theta _2, the inclined portion 15a, a divergent toward 5a thong flange portion 12 side (the angle θ- inclined portions 15a, 5a inclination angle theta ₂ in) (Fig. 1 (a) ( b)).

  Therefore, when the in-mold container 10 is pulled away from the female mold 2, the in-mold container 10 is not caught on the inclined portion 5 a of the protruding portion 5.

Similarly for having an inclined portion 6a inclination angle theta ₁ of the following angle theta with respect to each body part 11 of the inclined portion 16a and the groove 6 of the convex portion 16, when detaching the in-mold container 10 from the female mold 2, in The mold container 10 is not caught on the inclined part 6 a of the groove part 6.

For example, in FIGS. 1A and 1B, when the thickness T of the body 11 is 0.8 mm, the depth D of the recess 15 is 0.2 mm, and θ = 6 °,
The length X of the inclined portion 15a is X ≧ 0.2 / sin 6 ° = 1.91 mm.

  Specific examples of the present invention will be described below.

1. Shape of in-mold container (1) Container (1)
・ Flange outer diameter Φ71mm, Container height 110mm, Container full capacity 250cc,
Body thickness 0.72mm
・ Non-smooth part shape 4.8 × 3.2mm, convex part protrusion 0.3mm
-Quantity of convex parts 120, 174, 0.0022cc / piece (2) Container (2)
・ Flange outer diameter Φ88mm, container height 98mm, container full capacity 356cc,
Body thickness 0.79mm
-Shape of non-smooth part 6.2 x 9.4mm, protrusion amount of convex part 0.4mm
・ The number of convex parts is 165, 225, 0.0026cc / piece

2. Label specifications (unit: μm)
(1) OPP30 / PET12 (printing) / aluminum foil 7 / HS-OPP30 (OPP having a heat seal layer)
(Protective layer) (Print layer) (Barrier layer) (Seal layer)
(2) OPP30 / Aluminum-deposited PET12 / HS-OPP30
(Protective layer (printing layer)) (Barrier layer) (Seal layer)
(3) OPP30 / PET12 / Alumina-deposited PET / HS-OPP30
(Protective layer) (Print layer) (Barrier layer) (Seal layer)
(4) OPP30 / Aluminum foil 7 / HS-OPP30
(Protective layer (printing layer)) (barrier layer) (seal layer)
(5) Synthetic paper 80 / heat sealant

3. Specifications of injection resin (1) HDPE (high density polyethylene white color): Used with labels (1), (2), and (4).
・ Resin information: Asahi Kasei Chemicals Corporation Suntech J300
Physical properties MFR (melt flow rate) 42g / 10min (JIS K7
210: 1999)
Since labels (1), (2), and (4) are all metallic, the effect of the non-smooth portion is improved.
(2) PP (polypropylene natural clear): Used with label (3).
Resin information: Manufacturer Mitsui Chemicals, Inc. J246MA
Physical properties MFR 20g / 10min (ASTM D1238)
Since the label (3) is relatively transparent and the injection resin is also transparent, the contents in the container can be seen and there is a clear gloss.
(3) PP (polypropylene white color): Used with label (5).
Resin information: Manufacturer Mitsui Chemicals, Inc. J707G
Physical properties MFR 30g / 10min (ASTM D1238)

4). Molding conditions (1) When using HDPE as the injection resin in the container (1) ・ Injection resin temperature 210 ° C. Injection time 0.85 seconds ・ Cooling time 2.5 seconds Filling pressure 130MP
(2) When PP is used as the injection resin in the container (1)-Injection resin temperature 220 ° C Filling time 0.7 seconds-Cooling time 2.5 seconds Filling pressure 140MP
(3) When using HDPE as the injection resin in the container (2) ・ Injection resin temperature 220 ° C. Filling time 0.75 seconds ・ Cooling time 4 seconds Filling pressure 140MP

Claims (8)

A body portion having a flange portion;
A bottom connected to the body,
In an in-mold container that is molded by placing a label on the body,
The outer surface of the trunk is divided into two or more regions along the circumferential direction,
A non-smooth portion comprising a plurality of concave portions and / or a plurality of convex portions is provided in at least one partition region on the outer surface of the body portion, and a smooth portion is provided in the other partition region. The in-mold container is characterized in that the hit volume is equal to the volume per unit area of the smooth portion in the same height region as the non-smooth portion. Non-even section in a partition area, and a non-even portions in the divided areas adjacent, in-mold container according to claim 1, wherein the sandwiched therebetween are separated from each other between the smooth portion. Non-even section, the body portion of the upper part and the in-mold container according to claim 1, characterized in that it is formed by leaving a smooth portion provided in the lower part. Non-even section is formed by leaving a smooth portion provided on the lower part of the body, in-mold container according to claim 1, characterized in that a stack rib to the smooth portion of the non-smooth portion downward. Smoothing unit in the non-smooth portions in the same height region, in-mold container according to claim 1, characterized in that it has a thick portion protruding radially outward. Smoothing unit in the non-smooth portions in the same height region, in-mold container according to claim 1, characterized in that it has a thick portion projecting radially inwardly. Non-even section is formed by leaving a smooth portion provided on the upper portion of the body portion, the smooth portion of the non-smooth portion upward, in-mold container according to claim 1, wherein the vacuum hole marks are formed . The body outer surface is partitioned into three regions along a circumferential direction, and a non-smooth portion is provided in another partition region, leaving a smooth portion provided in at least one partition region. Item 2. An in-mold container according to item 1 .

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