JP5577594B2 - In-mold label container - Google Patents

Description

  The present invention relates to an in-mold label container formed by biaxial stretch blow molding, and more particularly to an in-mold label container including an in-mold label extending over 180 ° along the outer peripheral side surface of a container body.

  In-mold label molding is a molding method in which a label is set on a mold in advance during blow or injection molding, and a resin and a label are fused together during resin formation to integrally form and label. For example, Japanese Patent Laid-Open Nos. 2-1848484 and 3-251437 disclose plastic containers in which in-mold labels are provided on the outer periphery of the side surface of the container by direct blow hollow molding. However, in a plastic container obtained by biaxial stretch blow molding, no in-mold label has been provided on the entire outer periphery of the side surface of the container until now.

  Meanwhile, blown or injection molded plastic containers have been used as food containers. A container filled with food or the like is often affixed with a label on the outer peripheral side of the container in order to describe the details of the contents or to increase the commercial value. A plastic container obtained by biaxial stretch blow molding has excellent container appearance, and label sticking to the outer peripheral surface of the container has been performed by sticking a tack label or the like after container molding.

  JP-A-5-338018 proposes, as an example, a method in which a single-sheet label sealed in a cylinder is opened in a mold and a preform is attached to the mold.

  Incidentally, in recent years, from the viewpoint of environmental protection and the like, reduction of the amount of resin used in the container, that is, reduction in the thickness of the container is desired.

  However, if a tack label is to be attached to a thin plastic container, the container may be deformed due to the thin thickness of the container, making it difficult to attach the label.

  Moreover, when sticking a label on the whole outer peripheral side surface of a container, wrinkles etc. generate | occur | produced on the label and it was unpreferable on the external appearance.

  Further, when a label is attached to the outer peripheral side surface of the container, a step is generated between the portion with the label and the portion without the label, and thus the label may be peeled off from the step portion.

  Further, in the method proposed in Japanese Patent Application Laid-Open No. 5-338018, since the area where the label is attached is limited, the label cannot be covered over the entire area of the cylinder. In addition, there is a problem that a process for forming a cylindrical label is necessary.

  On the other hand, it is not easy to insert and hold a label having a length sufficient to cover the entire side surface of the container into the blow mold, and even with the method described in Japanese Patent Laid-Open No. 5-338018 above In addition, a biaxial stretch blow molded container having a label covering the entire circumference of the cylindrical side surface of the blow molded container including the height direction of the cylinder has not been developed yet.

  The present invention has been made in consideration of such points, and the label does not generate wrinkles and the label can be easily attached to the entire outer peripheral side surface of a thin container. An object of the present invention is to provide an in-mold label container formed by axial stretch blow molding or injection blow molding.

  The present invention comprises a bi-axial stretch blow characterized by comprising a cylindrical container body formed by bi-axial stretch blow and an in-mold label extending over 180 ° along the outer peripheral side surface of the container body. It is an in-mold label container formed by molding.

  As a preferred embodiment of the present invention, the in-mold label extends over 360 ° or more along the outer peripheral side surface of the container body.

  Moreover, as a more preferable aspect of the present invention, the in-mold label extends over 365 ° along the outer peripheral side surface of the container body.

  Furthermore, as a preferable aspect of the present invention, the overlap between one end of the in-mold label and the other end is 2 to 5 mm.

  Moreover, as another aspect of the present invention, the gap between one end of the in-mold label and the other end is 0 to 5 mm.

  As a preferred embodiment of the in-mold label container according to the present invention, the opening shoulder of the container main body has no step between the outer peripheral surface of the lid combined with the container main body and the outer peripheral side of the container main body, and the container main body and the lid are fitted. Molded to fit.

  Further, as a preferred embodiment of the present invention, the container body is made of polyethylene resin, polypropylene resin, random copolymer obtained by random copolymerization of propylene and ethylene, block copolymer obtained by block copolymerization of propylene and ethylene, or polypropylene. And a mixed resin of polyethylene.

  As a preferred embodiment of the present invention, the in-mold label has a multilayer structure.

  Furthermore, as a preferable aspect of the present invention, the in-mold label includes a barrier layer as an intermediate layer.

  In a preferred embodiment of the present invention, the barrier layer is a silica vapor deposition layer, an aluminum oxide vapor deposition layer, an aluminum vapor deposition layer, or an aluminum foil layer.

  As a preferred embodiment of the present invention, the thickness of the outer peripheral side surface of the container body is 200 to 800 μm.

  Moreover, as a preferable aspect of the present invention, when a gap is formed between one end and the other end of the in-mold label, each edge is inclined with respect to the blow molding stretching direction of the container. Is formed.

  Furthermore, in this invention, it is preferable that the clearance gap formed between the one end and the other end of the said in-mold label is a zigzag shape or a wavy line shape.

An in-mold label container according to the present invention includes a rotary table that holds a plurality of blow molds and is rotatable, a label holding core that winds and holds labels and supplies the labels into the blow molds of the rotary table, and a plug. A preform holding and supplying unit that holds the reform and that fits into the blow mold of the rotary table and supplies the preform into the blow mold,
An air blowing device connected to a preform holding and feeding unit that fits into a blow mold of a rotary table;
A preform set in a preform holding / supplying section, and a blow mold clamping device for closing the preform holding / supplying section and the blow mold from the left and right sides, and the label holding core is a cylindrical body that can be inserted into the blow mold. The container is molded using a container blow molding system characterized in that a recess is provided on one side of the side surface of the cylindrical body to receive both ends of the label.

  As another aspect of the present invention, a combination of the in-mold label container and the lid is provided.

  According to the present invention, since the label is provided on the outer peripheral side surface of the container by in-mold molding, wrinkles or the like do not occur on the label.

  Further, even when the container is thin, a label can be provided on the outer peripheral side surface of the container without difficulty in label sticking due to container deformation.

  Furthermore, when a label is provided on the outer peripheral side surface of the container, there is no difference in level between the portion with the label and the portion without the label. Moreover, since the label is provided by in-mold molding, the label is not peeled off when the container is used.

  Further, in the in-mold label container according to the present invention, each edge of the in-mold label is formed so as to be inclined with respect to the resin flow direction at the time of injection molding of the container. Will not be damaged.

The sectional side view of the in-mold label container of this invention. Sectional drawing of the A-A 'direction of the container shown in FIG. Sectional drawing of the container which provided the tack label in the side surface. Sectional drawing of the container of another aspect of this invention. The expanded sectional view of the container of another aspect of this invention. The side view of the in-mold label container of this invention. The side view of the in-mold label container of another aspect of this invention. The side view of the in-mold label container of another aspect of this invention. 1 is a schematic view showing a container blow molding system according to the present invention. The whole top view which shows the blow molding system of the container by this invention. The side view which shows the supply table and label shaping | molding supply part which hold | maintain a label holding core. The top view which shows the supply table and label shaping | molding supply part which hold | maintain a label holding core. The side view which shows the rotary table holding a blow die. The top view which shows the rotary table holding a blow die. The sectional side view which shows a blow die. The perspective view which shows a label holding core. The perspective view which shows the label holding core of another aspect. Sectional drawing which shows a label holding core. Sectional drawing which shows the label holding core of another aspect. The partial expanded side sectional view of the combined body of an in-mold label container and a lid | cover. The sectional side view of the in-mold label container of another aspect of this invention. Sectional drawing of the in-mold label container of another aspect of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Blow molding container 2 Container main body 2a Preform 3 Label 3a End part 3b Overlapping part 4 Level | step difference 5 Opening part 6 Opening shoulder part 7 Outer peripheral side 10 Container blow molding system 11 Rotary table 12 Blow molding part 13 Supply table 15 Preform molding Part 16 Preform cooling part 17 Gate cut part 18 Heating part 20 Label holding core 20a Adsorption part 20b, 20c Small cylindrical part 20d Recess 20e Cylindrical label holding core 20f Label adsorption hole 21 Label molding supply part 22 Label stock 23 Slitter 24 Label Cutting part 25 Receiving part 26 Lever 40 Blow mold 140 Blow mold clamping mold 41 Preform holder 43 Air blowing device 50 Lid 51 Fixing ring 52 Upper plate 53 Side plate 54 Inner ring 55 Contact ring

In-Mold Label Container An embodiment of an in-mold label container according to the present invention will be described below with reference to the drawings.

  FIG. 1 shows a side sectional view of an in-mold label container of the present invention. The in-mold label container 1 includes a cylindrical container body 2 formed by biaxial stretching blow described below, and an in-mold label 3 extending over 180 ° along the outer peripheral side surface of the container body. FIG. 2 shows a side cross section in the A-A ′ direction of the container shown in FIG. 1. In the present invention, as shown in FIG. 2, the label 3 is inserted into the side surface of the container main body 2 by in-mold molding so that the conventional tack label 3 ′ as shown in FIG. Compared with the container provided on the side surface, the level difference 4 between the both ends of the label (the part where no label is provided) and the label part hardly occurs on the container surface side.

  As shown in FIG. 4, the in-mold label is preferably provided so as to extend over 360 ° or more, preferably 365 ° or more along the outer peripheral side surface of the container body. Thus, 360 degree or more, that is, the label is wound around the entire side surface of the container, whereby the gas barrier property of the entire biaxial stretch blow molded container 1 can be improved by using the label 3 having a high gas barrier property.

  When providing a label over 360 degrees or more, it is preferable that the overlap part 3b of the both ends of the label 3 is 2-5 mm. In this case, at both end portions where the labels overlap, one surface and the other back surface are heat-sealed. In this way, by forming the in-mold label so as to overlap both end portions of the label, the label is more difficult to peel off, and the label is inserted all around the side surface of the container, so that the appearance of the product is also preferable. Become. On the other hand, when the overlap between both ends of the label exceeds 5 mm, it is difficult to mount the label.

  When the back surface and the front surface of the label are not thermally fused, it is necessary to perform in-mold label forming so that both ends of the label do not overlap. In this case, it is necessary to provide a label over 180 to 360 °, but in the present invention, in-mold label molding is performed so that the gap between one end of the in-mold label and the other end is 0 to 5 mm. Is preferred.

  By the way, when a gap is formed between one end and the other end of the in-mold label as described above, the direction of the gap and the resin flow direction at the time of injection molding of the container match. May crack in the gap due to impact caused by dropping or the like.

  Further, in in-mold label molding, a step is formed between the resin portion 3c (the portion without the label) and the label portion 3 of the container as shown in FIG. Further, a slight depression is formed on the inner wall side of the container resin portion as compared with the portion with the label. Therefore, when a drop impact is applied to the container, a crack 8 may be generated from the corner portion of the step to the recessed portion. In particular, when the edge of the in-mold label is formed along the resin flow direction at the time of injection molding of the container, the container tends to crack along the edge due to the flow orientation generated in the resin flow direction. .

  In this invention, as shown in FIG. 6, the edge of a label is formed so that it may incline with respect to the resin flow direction B at the time of injection molding of a container. Thus, by not matching the resin flow direction at the time of injection molding of the container and the edge direction (label gap) of the label, the occurrence of cracks can be suppressed even when subjected to a drop impact. For example, as shown in FIGS. 7A and 7B, the gap between the edges of the label may be formed in a zigzag shape, or as shown in FIGS. 8A and 8B. Alternatively, a wavy line may be formed.

  In addition, when the in-mold label is provided so as to extend over 360 ° C. along the outer peripheral side surface of the container body, there is no resin part (the part without the label), so there is a step between the label edge and the resin part. Since it is eliminated, the generation of cracks due to drop impact is suppressed.

  Hereinafter, a method for producing an in-mold label container obtained by such biaxial stretch blow molding will be described in detail with reference to the drawings.

  First, a container blow molding system used for manufacturing the in-mold label container of the present invention will be described.

  As shown in FIG. 9 (a), a preform 2a made of polypropylene is molded in a preform molding section 15 having preform molding dies 15a and 15b.

  The preform 2 a molded in the preform molding unit 15 is then held by the preform holder 41. The preform holder 41 is held and conveyed by the carrier 42. In this case, the preform holding part 19 is comprised by the preform holding body 41 and the conveyance body 42 (FIG. 10).

  The preform holding body 41 holding the preform 2a is transported to the heating unit 18 by the transport body 42, and the preform 2a is heated in the heating unit 18 (FIG. 9B).

  Next, with respect to the preform 2 a held by the preform holder 41, the blow mold 40 is lowered in the blow molding section 12, and the preform holder 41 is inserted into the blow mold 40. In this case, the label 3 is supplied in advance into the blow mold 40 by a label holding core 20 described later (FIG. 9C).

  Next, as shown in FIG. 9 (d), the air blowing device 43 rises and approaches from the lower side to the preform holding body 41 inserted in the blow mold 40 located in the blow molding portion 12. In this way, the air blowing device 43 is connected to the preform holding body 41, air is supplied from the air blowing device 43 into the preform 2a, and the preform 2a is blown into the blow mold 40 by the air thus supplied. The blow molded container 1 is molded. At this time, in the blow mold 40, the blow molded container 1 comprising the container main body 2 made of the preform 2a and the label 3 wound around the entire side surface of the container main body 2 is formed by biaxial stretch blow molding. .

  Next, the blow mold 40 is lifted from the preform holder 41, and thus the blow molded container 1 having the label 3 on the preform holder 41 is obtained (FIG. 9 (e)).

  A biaxial stretch blow molding system 10 for a container used in the present invention is held by a plurality of blow molds 40 as described above, and a rotatable rotary table 11 and a label 3 are wound and held to blow the rotary table 11. A label holding core 20 that supplies the label 3 into the mold 40 and a blow mold 40 that holds the preform 2 a and is positioned in the blow molding portion 12 of the rotary table 11 are fitted into the blow mold 40. A preform holding body 41 to be supplied therein and an air blowing device 43 that can be connected to the preform holding body 41 that fits into a blow mold 40 located in the blow molding portion 12 of the rotary table 11 are provided (see FIG. 10).

  In addition, on the upstream side of the turntable 11, a preform molding portion 15 including a pair of preform molding dies 15a and 15b for molding the preform 2a is provided. On the downstream side of the preform molding unit 15, a preform cooling unit 16 that cools the preform 2 a molded by the preform molding unit 15 and a gate of the preform 2 a cooled by the preform cooling unit 16 are cut. A gate cut portion 17 is sequentially provided.

  The preform 2 a cooled by the preform cooling unit 16 and gate-cut by the gate cut unit is held by a preform holding body 41, and the preform holding body 41 is conveyed to the heating unit 18 by the conveyance body 42. . The preform holding body 41 and the conveying body 42 constitute a preform holding / supplying unit 19.

  The preform 2 a held by the preform holder 41 is transported to the heating unit 18 and heated by the heating unit 18. Thereafter, the preform holding body 41 holding the preform 2a is conveyed to the rotary table 11.

  By the way, the blow mold 40 held on the rotary table 11 is conveyed along with the rotation of the rotary table 11 so that the label 3 held by the label holding core 20 is supplied into the blow mold 40. It has become.

  That is, the supply table 13 is rotatably provided near the rotary table 11, and the label holding core 20 is held on the supply table 13. A label forming supply unit 21 that forms and supplies the label 3 is disposed on the opposite side of the supply table 13 from the rotary table 11.

  Next, the supply table 13 for holding the label holding core 20 and the label forming supply unit 21 will be described with reference to FIGS.

  A supply table 13 is provided in the vicinity of the rotary table 11, and a label forming supply unit 21 for forming and supplying the label 3 on the opposite side of the supply table 13 from the rotary table 11 is provided.

  The label molding supply unit 21 includes a label original fabric supply unit 28 that supplies the label original fabric 22, a guide roller 31 that guides the label original fabric 22 supplied from the label original fabric supply unit 28, and a downstream side of the guide roller 31. A slitter 23 for forming a plurality of, for example, four strip-shaped label original fabrics 22, and a label original fabric 22 provided on the downstream side of the slitter 23 are cut. And a label cutting part 24 for forming the label 3.

  Further, a clamp 33 for holding the label original fabric 22 is provided on the downstream side of the label cutting part 24, and a receiving part for receiving the label 3 formed by the label cutting part 24 below the label cutting part 24 and the clamp 33. 25 is provided. In this label cutting part 24, the cutting edge part of a label can be made into a wave shape or a zigzag shape by selecting a label cutting blade suitably.

  The receiving portion 25 can be rotated by a lever (rotating mechanism) 26 so that the label 3 held in the horizontal direction can be set up in the vertical direction. That is, the lever 26 is rotatably attached to a moving body 27 that is held by a base 35 so as to be movable in the width direction, and the receiving portion 25 that receives the label 3 can be rotated from a horizontal position to a vertical position. .

  Among these, a label supply unit is configured by the moving body 27 on the base 35, the lever 26, and the receiving unit 25, and a label forming unit is configured by the clamp 33 and the label cutting unit 24.

  A label holding core 20 is mounted on the supply table 13, and four label holding cores 20 are provided on one side of the supply table 13 and four on the other side of the supply table 13. Yes. The label holding core 20 on one side of the supply table 13 and the label holding core 20 on the other side can be separated from each other by a cylinder 32.

  By the way, this label holding core 20 is suitably used when a long label near 360 ° or more than 360 ° is attached to a container. As shown in FIGS. 16 and 18, the label holding core 20 is formed of a substantially cylindrical body, and is formed with a recessed portion 20 d that is drawn inwardly on one side surface of the cylindrical body and that receives both end portions 3 a of the label 3.

  That is, a pair of small cylindrical portions 20b and 20c are provided on the side surface of the label holding core 20, and a concave portion 20d for receiving both end portions 3a of the label 3 is formed between the pair of small cylindrical portions 20b and 20c. Further, a suction portion 20 a that sucks and holds the label is provided on the side surface of the label holding core 20.

  As described above, since the concave portion 20d for receiving both end portions 3a of the label 3 is formed on the side surface of the label holding core 20, the label 3 is placed on the side surface of the label holding core 20 so that the both end portions 3a enter the concave portion 20d. Can be wound. For this reason, the label 3 can be wound with a relatively long label 3 in the circumferential direction by the label holding core 20 as compared with the case where there is no recess 20d. Further, when the label is relatively short in the circumferential direction, for example, in the case of 180 ° to less than 360 ° (gap of about 0 to 5 mm), the label holding core is made of only a cylindrical body as shown in FIGS. By using what formed 20e, the label 3 can be wound around a label holding core. The label 3 is sucked and held by the label holding core 20e by being sucked from the label suction hole 20f provided on the side surface of the cylindrical body.

  Next, the blow mold 40 held by the rotary table 11 will be described with reference to FIGS.

  As shown in FIGS. 13 to 15, the rotary table 11 is provided with 2 to 4 sets of blow molds 40 (in the figure, 4 sets are shown), and each set has 4 sets. It consists of a blow mold 40. Further, a set of blow molds composed of four blow molds 40 is arranged 90 ° apart from each other when four sets of blow molds are provided, and 180 sets when two sets of blow molds are provided. They are spaced apart one by one.

  Further, the blow mold 40 provided on the rotary table 11 is held by the holding plate 53 for every four sets. That is, the holding plate 53 that holds each set of blow molds 40 is movable in the vertical direction with respect to the rotary table 11 in the cylinder 50, and four holding plates 53 are provided on one holding plate 53 via the holding rod 51. The blow mold 40 is attached.

  A base 55 is provided below the rotary table 11, and the rotary table 11 is rotated by a servo motor 48 provided on the base 55.

  In FIG. 13, the right side of the rotary table 11 is a blow molding unit 12, and the left side of the rotary table 11 is the label 3 wound around the label holding core 20 on the supply table 13 in the blow mold 40. It becomes the transfer part 13b to insert. Note that the supply table 13 has a supply portion 13a that supplies the label 3 to the label holding core 20 on the opposite side of the transfer portion 13b (see FIG. 12).

  As shown in FIG. 13, an air blowing device 43 is provided in a portion corresponding to the blow molding portion 12 in the base portion 55, and the air blowing device 43 is provided with a compressed air blowing port 43 a.

  Further, the base 55 is provided with a stretch rod 45 penetrating the air blowing device 43, and the stretch rod 45 is moved in the vertical direction by an elevating cylinder 45 a attached to the base 55. The stretch rod 45 is inserted into the preform 2a held in the blow mold 40, and presses the preform 2a against the blow mold 40 during blow molding.

  Incidentally, as shown in FIG. 15, the blow mold 40 has a cylindrical side nested mold 40a, a blow mold clamping mold 140 surrounding the side nested mold 40a, and a bottom nested mold 40c. . A preform holding body 41 for holding the preform 2a is adapted to fit into the blow mold 40 and the blow mold clamping mold 140, and the preform 2a includes the preform holding body 41 and the preform holding body. It is held by a blow mold clamping die 140 provided outside the body 41.

  Further, in FIG. 15, the above-described stretch rod 45 rises from below to above in the blow mold 40 to press the preform 2 a against the bottom insert mold 40 c of the blow mold 40. Yes.

  Next, the operation of the present embodiment having such a configuration will be described.

  As shown in FIG. 10, the preform 2a is molded in the preform molding section 15 having a pair of preform molding dies 15a and 15b.

  The preform 2 a molded in the preform molding unit 15 is cooled by the preform cooling unit 16.

  Next, the preform 2a is sent to the gate cut portion 17 and gate cut.

  The preform 2 a cooled by the preform cooling unit 16 and gate-cut by the gate cut unit is held by a preform holding body 41, and the preform holding body 41 is conveyed to the heating unit 18 by the conveyance body 42. .

  The preform 2 a held by the preform holder 41 is transported to the heating unit 18 and heated by the heating unit 18. Thereafter, the preform holding body 41 holding the preform 2a is conveyed to the rotary table 11.

  During this time, the blow mold 40 held on the rotary table 11 is conveyed along with the rotation of the rotary table 11, and the label 3 held by the label holding core 20 is supplied into the blow mold 40. Yes.

  Next, the operation of forming the label 3 and supplying the label 3 into the blow mold 40 will be described.

  First, as shown in FIGS. 11 and 12, the label 3 is formed in the label forming supply unit 21, and the label 3 thus formed is supplied to the label holding core 20 side.

  That is, in FIG. 11 and FIG. 12, the label original fabric 22 is supplied from the label original supply unit 28 of the label forming supply unit 21, and the label original 22 supplied from the label original supply unit 28 is guided by the guide roller 31. 31 is sent to the slitter 23 provided on the downstream side. In the slitter 23, the label original fabric 22 is slit in the conveyance direction, and a plurality of, for example, four strip-shaped original labels 22 are formed. The strip-shaped label original fabric 22 is then cut at a label cutting portion 24 provided on the downstream side of the slitter 23, and the label 3 is formed. At this time, the label fabric 22 is held at its tip by the clamp 33.

  Next, the label 3 formed by cutting the label original fabric 22 in the label cutting unit 24 is received by the label cutting unit 24 and the receiving unit 25 provided below the clamp 33.

  Next, the moving body 27 holding each receiving portion 25 moves in the width direction, the receiving portion 25 expands in the width direction, and then the label 3 whose receiving portion 25 rotates 90 ° and extends in the transport direction is The direction is changed and it is arranged in the width direction.

  Next, the label 3 on the receiving portion 25 is rotated by a lever (rotating mechanism) 26 to change the direction from the horizontal direction to the vertical direction.

  In this way, the direction of the label 3 is changed from the horizontal direction to the vertical direction by the receiving portion 25, whereby the label 3 is wound around the outer periphery of the four label holding cores 20 that are arranged in advance at the supply position of the supply table 13. It is done.

  In this case, since the suction portion 20 a is provided on the outer periphery of the label holding core 20, the label 3 is sucked and held by the suction portion 20 a of the label holding core 20.

  By the way, as described above, a pair of small cylindrical portions 20b and 20c are provided on the side surface of the label holding core 20, and a concave portion 20d for receiving both end portions 3a of the label 3 is formed between the pair of small cylindrical portions 20b and 20c. Has been.

  As described above, since the concave portion 20d for receiving both end portions 3a of the label 3 is formed on the side surface of the label holding core 20, the label 3 is placed on the side surface of the label holding core 20 so that the both end portions 3a enter the concave portion 20d. Can be wound. For this reason, the label 3 can be wound with a relatively long label 3 in the circumferential direction by the label holding core 20 as compared with the case where there is no recess 20d.

  Next, the supply table 13 is rotated by 180 °, and the four label holding cores 20 at the supply position 13a of the supply table 13 are sent to the transfer position 13b of the supply table 13, and the label holding core is transferred to the transfer position 13b. The label 3 held by 20 is inserted into the blow mold 40 and transferred.

  That is, four blow molds 40 held by the rotary table 11 are on standby in the transfer device 13b. When the label holding core 20 comes to the transfer position 13b, the blow mold 40 is lowered to the label holding core 20 side by the cylinder 50 provided on the rotary table 11, and the label 3 held by the label holding core 20 is blown. The label 3 is inserted into the mold 40, and the label 3 is transferred from the label holding core 20 into the blow mold 40 by simultaneously or sequentially performing suction release of the label holding core and suction of the blow mold.

  At this time, the label 3 is sucked and held by suction holes, suction slits, or a combination thereof provided on the inner surface of the blow mold 40.

  In addition, as described above, the label 3 having a relatively long circumferential length can be held by the label holding core 20. For this reason, a label having a long circumferential length can be inserted into the blow mold 40 easily and reliably, and the substantially entire circumference of the blow molded container 1 can be covered with the label 3.

  Next, the rotary table 11 is rotated by the servo motor 48, and the blow mold 40 comes to the blow molding part 12 side. At this time, a preform holding body 41 holding the preform 2 a is disposed below the blow mold 40. Thereafter, the blow mold 40 and the preform holding body 41 are lowered, and the preform holding body 41 is fitted into an air blowing device 43 provided in a portion of the base 55 corresponding to the blow molding portion 12.

  Next, compressed air is supplied into the preform 2 a from a compressed air blowing port 43 a provided in the air blowing device 43.

  As described above, the base 55 is provided with the stretch rod 45 penetrating the air blowing device 43, and at the same time as the compressed air is supplied into the preform 2a, the stretch rod 45 is attached by the lifting cylinder 45a attached to the base 55. Move upward. The stretch rod 45 moved upward is inserted into the preform 2 a held in the blow mold 40 and presses the preform 2 a against the blow mold 40.

  In this way, the blow molded container 1 including the container body 2 with the label 3 adhered to the outer side surface in the blow mold 40 is obtained by biaxial stretch blow molding.

  In the present embodiment, the label 3 held by the label holding core 20 can be inserted into the blow mold 40, and the label holding core 20 is provided with a recess 20d for receiving both end portions 3a, 3a of the label 3. Therefore, the label 3 having a relatively long circumferential length can be inserted into the blow mold 40. For this reason, the substantially entire circumference of the blow molded container 1 can be covered with the label 3 having a long circumferential length.

  The container body 2 can be subjected to biaxial stretch blow molding without particular limitation as long as it is a thermoplastic resin such as polypropylene, polyethylene, polystyrene, polyester, polycarbonate, and polylactic acid. From the viewpoint of low odor of the container, polyethylene resin, polypropylene resin, random copolymer obtained by random copolymerization of propylene and ethylene, block copolymer obtained by block copolymerization of propylene and ethylene, or mixed resin of polypropylene and polyethylene Can be preferably used. In particular, it is preferable to use a block copolymer because the drop impact strength is improved.

  Moreover, the container which stuck the in-mold label as mentioned above can make the wall thickness of a container main body 200-800 micrometers. In this specification, “thickness of the container body” means the thickness of the container where the in-mold label is not provided, but there is a step on the peripheral surface of the container between the part with and without the label. Therefore, the thickness of the side wall portion of the container to which the in-mold label is attached is approximately 200 to 800 μm.

  The in-mold label 3 used in the present invention has a multilayer structure, and generally comprises a printing base layer, an intermediate layer, and an adhesive layer with the container body. Each of these layers can be formed by independently forming a film and bonding (dry lamination) with an adhesive, or by melt extrusion (EC, coextrusion) of a part or all of the layer. . Also, the printing substrate layer can be omitted depending on the application and purpose.

  The film as a printing substrate is not particularly limited as long as it is generally printable. For example, a polyester film, a polypropylene film, a nylon film, a synthetic paper, and the like can be used as appropriate, and among these, a biaxially stretched polypropylene film (Hereinafter also referred to as OPP film) is more preferably used. In addition, when forming an in-mold label by overlapping one end of the in-mold label with the other end of 2 to 5 mm, YUPO (manufactured by YUPO Corporation) or CARLE (manufactured by Chisso) is used from the viewpoint of the adhesiveness of the label end. Synthetic paper such as) is preferred.

  The intermediate layer preferably functions as a barrier layer. As the barrier layer, for example, (a) aluminum foil (thickness 7 to 25 μm), (b) a metal or metal oxide laminated on a plastic film by vapor deposition, for example, silicon oxide vapor deposition plastic film, aluminum oxide vapor deposition Plastic film, aluminum vapor deposition plastic film, diamond-like carbon chemical vapor deposition film (c) and others, polyacrylonitrile resin, EVOH (ethylene vinyl acetate copolymer saponified product), PVDC (polyvinylidene chloride) film, PVDC coated biaxially stretched plastic A film etc. are mentioned and it can select suitably according to desired performance.

  The adhesive layer is not particularly limited as long as it adheres to the resin of the container main body, but usually a plastic made of the same material as the resin on the container side, a heat-sealable resin film, or the like 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.

Specific examples of the layer structure of the label include the following aspects.
(1) OPP (30 μm) / adhesive / PET (12 μm) / ink layer / adhesive / aluminum foil (7 μm) / adhesive / heat sealable OPP (30 μm)
(2) OPP (40 μm) / ink / adhesive layer / aluminum foil (7 μm) / adhesive layer / heat-sealable OPP (30 μm)
(3) OPP (30 μm) / ink / adhesive layer / aluminum-deposited PET (12 μm) / adhesive / heat-sealable OPP (30 μm)
(4) OPP (30 μm) / ink / adhesive layer / aluminum deposition heat sealability OPP (30 μm)
(5) OPP (30 μm) / ink / adhesive layer / transparent deposited PET (12 μm) / adhesive layer / heat-sealable OPP (30 μm)
(6) OPP (30 μm) / ink / adhesive layer / heat-sealable OPP (30 μm)
(7) OP ink / synthetic paper (80 μm) / heat sealant

Next, the combination of the in-mold label container and the lid according to the present invention will be described.
FIG. 20 is a cross-sectional view of the state in which the lid 50 is attached to the in-mold label container 1. The fixing ring 51 of the lid 50 is fixed by engaging with the opening 5 of the in-mold label container. With this fixing ring 51, the lid 50 can be attached to and detached from the container 1.

  The opening shoulder 6 of the container main body is formed so that the fixing ring 51 that is the outer peripheral surface of the lid 50 combined with the container 1 and the outer peripheral side surface 7 of the container main body have no step, and the container main body and the lid portion are fitted. ing. Thus, since there is no gap between the peripheral surface of the fixing ring portion of the lid and the outer peripheral side surface of the container, the sense of unity of the entire combination is improved, which is aesthetically preferable.

  The lid upper plate 52 is provided with an inner ring 54 so as to be disposed inside the side plate 53 together with the side plate 53 descending from the peripheral line of the upper plate 52. When the upper end of the opening 5 of the container 1 is press-fitted into the gap between the side plate 53 and the inner ring 54, the lid is closed. Since there is almost no gap between the opening 6 of the container and the side plate 53 or the inner ring 54, the hermeticity of the container is maintained.

  Further, the upper plate 52 of the lid is provided with a contact ring 55 that descends from the peripheral line of the upper plate between the side plate 53 and the inner ring 54. When the lid 50 is engaged and fixed with the container 1, the contact ring 55 contacts the upper end of the opening 5 of the container. This contact ring further improves the sealing performance of the container.

  As described above, for the in-mold label container according to the present invention, as a form of the container main body, the wide-mouthed cylindrical container as shown in FIG. 1 has been described as an example. A narrow neck-in bottle as shown in FIG. 21, for example, may be used as long as the part to be attached is cylindrical.

  Further, the label mounting portion of the container body is not limited to a cylindrical shape, but a shape that allows a belt-like label to be mounted on the side of the container, for example, an elliptical cylindrical shape, a triangular cylindrical shape with rounded corners, as shown in FIG. It may be a square tube shape.

Claims (14)

A cylindrical container body formed by biaxial stretching blow, and an in-mold label extending over 180 ° along the outer peripheral side surface of the container body,
The container body is composed of a polypropylene resin, a random copolymer obtained by random copolymerization of propylene and ethylene, a block copolymer obtained by block copolymerization of propylene and ethylene, or a mixed resin of polypropylene and polyethylene,
The in-mold label includes an adhesive layer that adheres to the resin of the container body,
The adhesive layer is a polypropylene resin, a random copolymer obtained by copolymerizing randomly propylene and ethylene, propylene, ethylene and a blockwise copolymerized block copolymer or a Ri Do resin mixture of polypropylene and polyethylene, and further, It consists of a resin layer of the same material as the resin constituting the container body,
An in-mold label container formed by biaxial stretch blow molding. The in-mold label container according to claim 1, wherein the in-mold label extends over 360 ° or more along the outer peripheral side surface of the container body. The in-mold label container according to claim 1 or 2, wherein the in-mold label extends over 365 ° along the outer peripheral side surface of the container body. The in-mold label container according to claim 3, wherein an overlap between one end of the in-mold label and the other end is 2 to 5 mm. The in-mold label container according to claim 1, wherein a gap between one end of the in-mold label and the other end is 0 to 5 mm. The opening shoulder of the container body is formed so that the outer peripheral surface of the lid combined with the container main body and the outer peripheral side surface of the container main body are not stepped, and the container main body and the lid are fitted. The in-mold label container as described in any one of -5. The in-mold label container according to any one of claims 1 to 6, wherein the in-mold label has a multilayer structure. The in-mold label container according to claim 7, wherein the in-mold label includes a barrier layer as an intermediate layer. The in-mold label container according to claim 8, wherein the barrier layer is an aluminum vapor deposition layer or an aluminum foil layer. The in-mold label container as described in any one of Claims 1-9 whose wall thickness of the outer peripheral side surface of the said container main body is 200-800 micrometers. In the case where a gap is formed between one end and the other end of the in-mold label, each end edge is formed so as to be inclined with respect to the resin flow direction at the time of injection molding of the container. The in-mold label container as described in any one of claim | item 1 -10. The in-mold label container according to claim 11, wherein a gap formed between one end and the other end of the in-mold label is zigzag or wavy. A rotary table that holds a plurality of blow molds and is rotatable,
A label holding core that winds and holds the label and supplies the label into the blow mold of the rotary table;
A preform holding and supplying unit that holds the preform and that fits into the blow mold of the rotary table and supplies the preform into the blow mold;
An air blowing device connected to a preform holding and feeding unit that fits into a blow mold of a rotary table;
A preform set in the preform holding and supplying section, and a blow mold clamping device for closing the preform holding and supplying section and the blow mold from the left and right,
The in-mold label container according to any one of claims 1 to 12, wherein the label holding core is formed by using a container blow molding system comprising a cylindrical body that can be inserted into a blow mold. . The combination body of the in-mold label container and lid | cover as described in any one of Claims 1-13.

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