WO2018062128A1 - Étiquette dans le moule, récipient étiqueté, et appareil de production et procédé de production pour récipient étiqueté - Google Patents

Étiquette dans le moule, récipient étiqueté, et appareil de production et procédé de production pour récipient étiqueté Download PDF

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Publication number
WO2018062128A1
WO2018062128A1 PCT/JP2017/034638 JP2017034638W WO2018062128A1 WO 2018062128 A1 WO2018062128 A1 WO 2018062128A1 JP 2017034638 W JP2017034638 W JP 2017034638W WO 2018062128 A1 WO2018062128 A1 WO 2018062128A1
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WO
WIPO (PCT)
Prior art keywords
label
mold
melting point
low melting
resin layer
Prior art date
Application number
PCT/JP2017/034638
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English (en)
Japanese (ja)
Inventor
駿介 本田
高広 座間
雄太 岩澤
孝 船戸
雅生 宇田川
Original Assignee
株式会社ユポ・コーポレーション
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Application filed by 株式会社ユポ・コーポレーション filed Critical 株式会社ユポ・コーポレーション
Publication of WO2018062128A1 publication Critical patent/WO2018062128A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
    • B29C49/06—Injection blow-moulding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/24—Lining or labelling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D25/00—Details of other kinds or types of rigid or semi-rigid containers
    • B65D25/20—External fittings
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
    • G09F3/04—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps to be fastened or secured by the material of the label itself, e.g. by thermo-adhesion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
    • B29C2049/023—Combined blow-moulding and manufacture of the preform or the parison using inherent heat of the preform, i.e. 1 step blow moulding

Definitions

  • This example relates to an in-mold label, a labeled container, a manufacturing apparatus and a manufacturing method for a labeled container.
  • an in-mold label having an adhesive layer made of polyethylene cannot be attached to the surface of a container obtained by blow molding a preform made of polyester resin represented by polyethylene terephthalate.
  • a stretched polypropylene film having a heat seal layer containing an ethylene-vinyl acetate copolymer, a label having an adhesive layer thickness of 25 to 50 ⁇ m, and the label as a polyester A labeled container obtained by sticking to a container is known (for example, see Patent Document 2).
  • a heat-sealable film having a thickness of 5 to 3 ⁇ m is disclosed (for example, see Patent Document 3).
  • the publication does not describe in-mold molding.
  • an in-mold label using a similar polar resin and having an adhesive layer having a thickness of 3 ⁇ m is attached to a polyester container (for example, see Patent Document 4).
  • the sticking surface toward the container is formed by a heat seal layer.
  • This heat seal layer is generally formed of a low melting point resin, and is melt-bonded to the container during in-mold molding.
  • PET polyethylene terephthalate
  • the label is adhered to the container unless a polar resin such as an ethylene-vinyl acetate copolymer or an alkyl acrylate copolymer is used in the low melting point resin layer of the label. Is difficult.
  • the polar resin when used for the low-melting point resin layer, it cannot be industrially produced unless it is co-extruded with the base material or molded by thermal lamination to the base material. Problems such as coloring due to thermal decomposition and curling due to the thickness may occur because the adhesive layer needs to be thicker.
  • the heat quantity of the parison original made of thermoplastic resin for use in blow molding
  • the heat quantity of the direct blow molding parison so select a resin that can be fused with less heat.
  • a polar resin having a melting point of 130 ° C. or lower is selected.
  • non-polar resin a resin containing almost no hetero atoms (atoms other than hydrogen atoms and carbon atoms) in the main chain or side chain in the adhesive layer.
  • non-polar resin a resin containing almost no hetero atoms (atoms other than hydrogen atoms and carbon atoms) in the main chain or side chain in the adhesive layer.
  • One of the objects of the present invention is to provide an in-mold label that is attached to a polar resin container in spite of being provided, and an in-mold label that does not easily peel off the label from the container even when the labeled container is brought into contact with water. did. That is, the problem to be solved by the present invention is that an in-mold label adhered to a polar resin container in spite of using a non-polar resin for the adhesive layer, and further bonded under low temperature bonding conditions of stretch blow molding.
  • Another object of the present invention is to provide a labeled container in which the label is attached to a polar resin container.
  • the present inventors have selected a nonpolar resin as the adhesive layer, and after laminating a low melting point resin that melts with the heat of stretch blow molding at a specific thickness, the surface of the low melting point resin layer It has been found that the above-mentioned object can be achieved and the above-mentioned problems can be solved by activating treatment.
  • the manufacturing apparatus and manufacturing method of a labeled container according to the present invention are intended to attach a label to a container made of a polar resin as a material while selecting a nonpolar resin for the low melting point resin layer of the label.
  • the present invention is not limited to the above-mentioned purpose, and is an operation and effect derived from each configuration shown in “Mode for Carrying Out the Invention” to be described later. Can be positioned as other purpose.
  • the in-mold label disclosed herein has a low melting point resin layer on one surface of a thermoplastic resin film, the low melting point resin layer contains a polyethylene resin, and the melting point of the polyethylene resin is 60.
  • the low melting point resin layer has a thickness of 1.5 to 15 ⁇ m, and the surface of the low melting point resin layer is activated.
  • the polyethylene-based resin is preferably a copolymer of 95 mol% or more and less than 100 mol% of ethylene and more than 0 mol% and 5 mol% or less of a monomer copolymerizable with ethylene.
  • corona discharge treatment traces exist on the surface of the low melting point resin layer.
  • thermoplastic resin film (A) has an ink receiving layer on the surface not having the low melting point resin layer.
  • the in-mold label according to any one of the above (1) to (4) is adhered to the surface of a polar resin container.
  • the polar resin is a polyester resin.
  • An apparatus for manufacturing a container with a label disclosed herein has an extraction part for taking out a label having a low melting point resin layer, and the label taken out by the extraction part with the low melting point resin layer facing inward.
  • An arrangement part arranged in a mold and a container in which a molding material is supplied into the mold, and the label arranged in the mold by the arrangement part is adhered to an outer wall with the low melting point resin layer
  • an activation processing unit that performs an activation process on the low-melting point resin layer before the label is arranged in the mold by the arrangement unit.
  • the said activation process part is a corona discharge process part which performs a corona discharge process.
  • a plurality of the labels are arranged on a long film in a longitudinal direction of the film, and further provided with a feeding part for feeding out the film, wherein the taking-out part is provided with the label from the film fed out by the feeding part. It is preferable that the activation processing unit performs the activation processing on the low-melting point resin layer of the label arranged on the film being fed from the feeding unit.
  • the method for manufacturing a labeled container disclosed herein includes an extraction step of taking out a label having a low melting point resin layer, and the label taken out by the extraction step with the low melting point resin layer facing inward.
  • the activation treatment step is a corona discharge treatment step for performing a corona discharge treatment.
  • the label is further arranged on a long film in the longitudinal direction of the film, and further includes a feeding step of feeding out the film, and in the taking out step, the label from the film fed out by the feeding step
  • the activation treatment is preferably performed on the low-melting point resin layer of the label arranged on the film being fed out from the feeding step.
  • the wettability of the low melting point resin layer is improved by performing the activation treatment on the low melting point resin layer of the label.
  • the adhesion between the container and the low melting point resin layer can be improved, and even when the container is a molded polar resin, a label using a nonpolar resin can be attached to the low melting point resin layer.
  • the warping of the label can be suppressed compared to the production method of taking out the stacked sheet-by-sheet labels one by one, static electricity etc.
  • the labels do not overlap and are not removed.
  • the quality of the labeled container can be improved. Furthermore, according to the in-mold label in which the type and physical properties of the resin contained in the low-melting point resin layer and the thickness of the low-melting point resin layer are controlled within a specific range, the adhesive strength and water peel resistance to the polar resin container are improved. .
  • FIG. It is a figure which shows a container with a label
  • (A) is a perspective view which shows a container with a label
  • (B) is a perspective view which expands and shows the area
  • (C) is (B)
  • FIG. It is a top view which shows typically the whole structure of a manufacturing apparatus. It is a perspective view which shows the film on a manufacturing apparatus, and its periphery. It is a perspective view which shows typically a mode that the deformed part of the label conveyed in a manufacturing apparatus is removed. It is a perspective view which shows typically the metal mold
  • a numerical range expressed using “to” means a range including numerical values described before and after “to” as a lower limit value and an upper limit value, respectively.
  • “mainly contained” means containing most by mass ratio.
  • an organic substance having 2 carbon atoms such as ethane or ethylene may be represented by the number of carbon atoms such as C2.
  • the melting point of the thermoplastic resin is the melting peak temperature according to JIS K7121: 1987.
  • the upstream and downstream are defined based on the manufacturing process of the labeled container, the direction of gravity is defined as the downward direction, and the opposite direction is defined as the upward direction.
  • the low melting point resin layer (or heat seal layer) is placed in the mold facing inward means that the surface opposite to the low melting point resin layer (or heat seal layer) of the label is on the mold. It shows that it is arranged so that the surface of the low melting point resin layer side (or heat seal layer side) of the label is adhered to the container.
  • the labeled container manufactured with the apparatus and method of this embodiment is the hollow container 2 by which the label 10 is stuck on the outer wall 2a.
  • the state in which the label 10 is fused (welded) to the container 2 and integrated is included in the state in which the label 10 is adhered to the container 2.
  • the label 10 is stuck to the container 2 by in-mold labeling (in-mold molding). Therefore, at least a part of the label 10 in the thickness direction is buried in the outer wall 2 a of the container 2. Therefore, as shown in FIGS. 1B and 1C, the dimension in the thickness direction of the label 10 is set to “T 1 ”, and the height of the label 10 that forms a stepped portion on the outer side with respect to the outer surface 2b of the outer wall 2a. If the thickness dimension (thickness direction dimension) is set to “T 2 ”, the inequality “T 1 > T 2 ” is satisfied. In the case of a blow molding method using a preform, it is easy to satisfy the inequality “T 1 > T 2 ”.
  • the some label 10 (label group) is stuck on the outer wall 2a of the container 2 by the side view.
  • the label 10 before being attached to the container 2 has a heat seal layer 1a (see FIG. 3) in advance on the back surface (attachment surface).
  • labels 10 (simply referred to as “label 10”) including a first label 11 and a second label 12 are illustrated on the outer wall 2 a on the front side of the container 2.
  • a single label is attached to the outer wall on the back side of the container 2.
  • the labels 11 and 12 are formed in different shapes.
  • a circular first label 11 is illustrated, and a triangular second label 12 is illustrated.
  • Other examples of the contour shape of the labels 11 and 12 include various shapes in which the contour is composed only of a curve.
  • a shape whose contour is composed only of a curve includes a shape in which curved lines such as autumn leaves are abutted at corners.
  • a plurality of labels 10 are regularly arranged in the longitudinal direction of one main surface of the long (band-shaped) film 1. These labels 10 can be separated from the film 1 as will be described later.
  • the film 1 has at least three layers in the order of a heat seal layer 1a, a base layer 1b, and a printing layer 1c from the back side (the front side in FIG. 3) to the front side (the back side in FIG. 3). Formed.
  • the label 10 having a three-layer structure in which the heat seal layer 1a, the base layer 1b, and the print layer 1c are laminated in this order will be described.
  • the ink receiving layer corresponding to the print layer 1c is an arbitrary layer.
  • the heat seal layer 1a functions as an adhesive for joining the label 10 and the container 2 and is a low melting point resin layer formed of a low melting point resin. Therefore, hereinafter, the heat seal layer 1a is also referred to as a low melting point resin layer 1a.
  • the low melting point resin layer 1a is solid at normal temperature, but is activated by the heat of the molten resin when the adherend (container 2) is molded in the mold, and is melted and bonded to the adherend to cool. After that, it becomes solid again and exhibits strong adhesive strength.
  • the base layer 1b and the print layer 1c can be formed of various conventionally known materials. Moreover, the thickness of the low melting point resin layer 1a, the base layer 1b, and the printing layer 1c is not particularly limited.
  • a part of the film 1 is a label 10 and the other part is a blank part 13. That is, the film 1 is cut along the contour shape of the label 10, and the label 10 and the blank portion 13 are partitioned through the cutting line.
  • the label 10 and the blank portion 13 are partially connected in the state where the film 1 is drawn out, and the label 10 and the blank portion 13 are completely separated.
  • a point-stopping process in which the label 10 and the blank portion 13 are connected in a dotted manner at a plurality or a single location is performed.
  • the above-mentioned cutting line may be formed in perforation shape.
  • the film 1 may be cut (half cut) in the depth (thickness) direction from the low melting point resin layer 1a side or the printing layer 1c side. At this time, at least one of the low melting point resin layer 1a, the base layer 1b, and the printing layer 1c is configured to be connected without being completely cut. For example, half cutting is performed using a rotary die cutter or a pinnacle die. Moreover, the film 1 is drawn out in a state where the outline of the label 10 is not cut, and the label 10 can be cut by a die cutter having a blade portion corresponding to the outline shape of the label 10. Alternatively, the film 1 may be cut (laser cut) with a laser along the contour shape of the label 10.
  • the film 1 may be affixed to another transport film.
  • the low melting point resin layer 1a, the base layer 1b, and the printing layer 1c are transport films different from the film 1 through a slightly sticky adhesive or adhesive. It may be attached so as to be removable.
  • the pressure-sensitive adhesive or the adhesive does not remain on the surface of the printing layer 1c. In this case, a complete punching process in which the label 10 and the blank portion 13 are completely separated may be performed.
  • all of the low melting point resin layer 1a, the base layer 1b, and the printing layer 1c do not necessarily have to be attached to the transport film.
  • the labeled container manufacturing apparatus includes three feeding mechanisms (feeding portions) 20, a feeding mechanism (conveying portion) 50, and a forming mechanism (forming portion) 90 provided from the upstream side to the downstream side. Broadly divided into two mechanisms.
  • the feeding mechanism 20 feeds the film 1 on which the labels 10 are arranged, and the transport mechanism 50 transports the label 10 from the fed film 1 until it is placed in the mold 91.
  • the molding mechanism 90 supplies the molding material into the mold 91, and sticks the label 10 disposed inside the mold 91 to the outer wall 2a (see FIG. 1) to mold the container 2.
  • the feeding mechanism 20 is provided with an activation processing unit 200 which is a major feature of the present invention.
  • the feeding mechanism 20 may be provided with an inspection unit 40 that inspects the printed state of the pattern of the printed label 10.
  • a pattern, a pattern, a character, or the like (simply referred to as “pattern”) of the label 10 is printed on the film 1 in advance.
  • a printing unit 30 (indicated by a two-dot chain line in FIG. 2) for printing the design of the label 10 on the surface of the printing layer 1 c in the film 1 may be attached to the feeding mechanism 20. That is, the printing unit 30 for preparing the film 1 on which the labels 10 are arranged may be incorporated in the labeled container manufacturing apparatus.
  • the transport mechanism 50 is provided with an arm part (extraction part, placement part) 60 that separates and holds the transported label 10 from the film 1 and places the transported label 10 inside the mold 91.
  • a charging unit 80 for charging the label 10 being transported is attached to the transport mechanism 50.
  • a shaping unit 70 that shapes the label 10 being conveyed may be attached to the conveyance mechanism 50.
  • the manufacturing apparatus described here is provided with a mold 91 composed of two split molds 91a and 91b. Specifically, the first split mold 91a is disposed on one side (upper in FIG. 2) and the second split mold 91b is disposed on the other side (lower in FIG. 2). In addition to increasing the processing efficiency, the molding efficiency of the container 2 is also improved.
  • the labeled container has a front side molded by the first split mold 91a and a back side molded by the second split mold 91b.
  • the manufacturing apparatus is provided symmetrically in the horizontal direction (vertical symmetry in FIG. 2).
  • two systems of manufacturing processes can be performed simultaneously.
  • the label 10 attached to the outer wall 2a on the front side of the container 2 is handled on one side of the apparatus, and at the same time, the label attached to the outer wall on the back side of the container 2 is handled on the other side of the apparatus.
  • a manufacturing apparatus that is provided with two sets of molds 91 and simultaneously molds two labeled containers is illustrated. In the following description, description will be given mainly focusing on one side of the apparatus.
  • the feeding mechanism 20 is a mechanism that feeds the label 10 to a predetermined position by feeding the film 1.
  • the feeding mechanism 20 is provided with two rotating shafts 21 and 22. Of these rotary shafts 21 and 22, the first rotary shaft 21 arranged on the upstream side is pulled out from the state in which the film 1 before separating the label 10 is wound, and the second rotation arranged on the downstream side. On the shaft 22, the film 1 (remaining part) after the label 10 is separated is taken up. Here, the second rotating shaft 22 is rotationally driven. Furthermore, the intermediate part of the film 1 wound around the rotating shafts 21 and 22 is stretched in a planar shape.
  • the feeding mechanism 20 may be provided with a positioning mechanism (positioning portion) 25 for stopping the fed label 10 at the separation position as indicated by a two-dot chain line in FIG.
  • a positioning mechanism positioning portion 25 for stopping the fed label 10 at the separation position as indicated by a two-dot chain line in FIG.
  • the marking 14 such as an eye mark or a registration mark attached to the blank portion 13 of the film 1, and an optical device that images or scans the marking 14 (hereinafter simply referred to as “imaging”). 26 can be used.
  • imaging optical device that images or scans the marking 14
  • the printing unit 30 is a printer that prints a pattern on a portion that becomes the label 10 of the film 1. That is, the label 10 is formed by performing required printing on the surface of the film 1.
  • various printing methods such as a printing plate method, an electrophotographic method, an ink jet method, and a thermal transfer method can be adopted as long as they can be printed on the label 10.
  • variable information such as a serial number, date, and name can be printed on demand.
  • the inspection unit 40 inspects whether or not the label 10 fed out by the feeding mechanism 20 is in a predetermined state.
  • predetermined state means that the state of the label 10 is good (passed).
  • not in a predetermined state means that the state of the label 10 is defective (failed). Therefore, it can be said that the inspection unit 40 detects the defective label 10.
  • Examples of the inspection target by the wrinkle inspection unit 40 include the printing state and surface state of the label 10. If the object to be inspected is a print state, the position or color of the image printed on the label 10 is inspected in a predetermined print state (predetermined state), that is, whether or not a desired print is being performed. If the inspection target is a surface state, it is inspected whether or not the label 10 is in a predetermined surface state (predetermined state) in which no foreign matter is attached.
  • the inspection unit 40 includes a detection unit 41 that detects the state of the label 10 and a determination unit 42 that determines whether the label 10 is in a predetermined state based on the detection result of the detection unit 41.
  • the detection unit 41 various known devices that can detect the state of the label 10 can be used.
  • an optical device such as a camera or a scanner that images the label 10 is used for the detection unit 41.
  • a CCD area camera or a line sensor is employed as the detection unit 41.
  • a device that irradiates the label 10 with visible light or laser light may be attached to the detection unit 41.
  • the activation processing unit 200 is arranged on the low melting point resin layer 1a (see FIG. 3) side of the label 10.
  • the activation processing unit 200 performs an activation process on a bonding surface to be bonded to the container 2 of the low melting point resin layer 1a, that is, a surface facing inward of the mold 91 when disposed in the mold 91.
  • the low melting point resin layer 1a is activated and wettability is improved.
  • the position of the activation processing unit 200 is not limited to the illustrated position as long as the low melting point resin layer 1a can be activated before the label 10 is placed on the mold 91.
  • the activation processing unit 200 may be disposed at a position where the activation process can be performed on the label 10 before. Further, the activation processing unit 200 may perform the activation process only during a period in which the label 10 passes the processing position where the activation process is performed. Or you may make it perform an activation process continuously. When the activation process is continuously performed, not only the label 10 but also the entire film 1 including the blank portion 13 (see FIG. 3) is activated.
  • the surface of the low melting point resin layer 1a is activated during in-molding, whereby the adhesion between the low melting point resin layer 1a and the container 2 is improved.
  • the label adhesive strength of the labeled container 2 can be increased.
  • a corona discharge treatment can be mainly exemplified, but a flame treatment and a plasma treatment can also be exemplified.
  • corona discharge treatment and plasma treatment are preferred from the viewpoint of treatment effects, and corona discharge treatment and flame treatment are preferred from the viewpoint of using simple equipment.
  • specific configurations of a corona discharge processing unit that performs corona discharge processing, a frame processing unit that performs frame processing, and a plasma processing unit that performs plasma processing will be described.
  • the corona discharge treatment section includes a discharge electrode provided on the low melting point resin layer 1a side and a counter electrode roll disposed on the opposite side of the discharge electrode with the film 1 interposed therebetween. That is, the discharge electrode and the counter electrode roll are opposed to each other through the film 1.
  • the discharge electrode is not particularly limited, and examples thereof include a prismatic shape, a wire shape, a blade shape, and the like, and an electrode that is intended to stably discharge from a peak portion by providing a valley portion on the electrode.
  • the counter roll is preferably coated with an insulator. Examples of the insulator include various rubbers and ceramics.
  • the surface of the film 1 can be modified by exposing the traveling film 1 to an arc discharge region generated between the discharge electrode and the counter electrode roll while contacting the counter electrode roll. Moreover, it is preferable to apply a DC voltage between the discharge electrode and the counter electrode roll.
  • the flame frame processing unit includes a burner provided on the low melting point resin layer 1 a side and having a nozzle row parallel to the film 1.
  • Activation treatment can be carried out by spraying ionized plasma in a flame generated when combustible gas such as natural gas or propane is burned by a burner onto the surface of the low melting point resin layer 1a.
  • the soot plasma processing unit includes a pair of counter electrodes provided on the low melting point resin layer 1a side, and a counter electrode roll disposed to face these counter electrodes with the film 1 interposed therebetween.
  • the electrode include a flat plate shape, a convex surface on the opposite surface, and a roll shape that can rotate.
  • the counter roll is preferably coated with an insulator.
  • a gas in which hydrogen, oxygen, nitrogen, air or the like is mixed with a gas mainly composed of an inert gas such as argon, helium, or neon is passed through a glow discharge region generated between the discharge electrode and the counter electrode roll.
  • an excited inert gas which is excited electronically, removes charged particles, and is electrically neutral is sprayed on the film surface.
  • the activation treatment amount in the case of corona discharge treatment is preferably 600 to 12,000 J / m 2 (10 to 200 W ⁇ min / m 2 ), from the viewpoint of obtaining the effect of corona discharge treatment, and is preferably 1,200 to 9,000 J / M 2 (20 to 150 W ⁇ min / m 2 ) is more preferable.
  • the amount of activation treatment is preferably 8,000 to 200,000 J / m 2 and more preferably 20,000 to 100,000 J / m 2 from the viewpoint of obtaining the effect of the activation treatment.
  • the processing amount is within this range, the label adhesive strength is unlikely to decrease.
  • the processing amount can be controlled by the applied power, the interval between the discharge electrode and the film, the processing speed (label transport speed), and the like. Moreover, if the corona discharge treatment is sufficiently performed on the surface after the corona discharge treatment, it is usually preferable that a corona discharge treatment trace is present. Corona discharge treatment traces include surface pinholes due to arcing, processing unevenness due to uneven distribution of streamers (surface tension varies depending on location), and post-treatment charging. Charging due to corona discharge can be confirmed by sprinkling a mixture of two types of toners having different polarities and colors on the surface, so that the toners having different polarities are unevenly distributed on the surface, resulting in a mottled pattern of two colors. If there is a corona discharge treatment mark on the surface of the low melting point resin layer 1a, it can be confirmed that the low melting point resin layer 1a has been activated by the corona discharge treatment.
  • the surface tension obtained using the test mixture according to JIS K6768: 1999 “Plastic-Film and Sheet-Wetting Tension Test Method” is 40 mN / m. That's it.
  • the surface tension of the low melting point resin layer 1a is preferably 40 to 75 mN / m, more preferably 45 to 70 mN / m, and further preferably 50 to 65 mN / m. This increases the adhesive strength of the labeled container. It is presumed that the wetting and spreading of the resin composition (for example, the thermoplastic resin composition) constituting the low melting point resin layer 1a with respect to the parison is not good whether the surface tension is high or low outside the above range.
  • This increases the adhesive strength of the labeled container.
  • Any O / C ratio within the above range is presumed to have good wetting and spreading of the resin composition (for example, thermoplastic resin composition) constituting the low melting point resin layer 1a with respect to the parison.
  • the activation treatment effect may gradually decrease over time, the activation treatment may be performed immediately before in-mold molding from the viewpoint of suppressing variations in the adhesive strength of the labeled container for each label production lot. .
  • the transport mechanism 50 is provided with a slide rail 51 that extends so as to straddle the feeding mechanism 20 and the forming mechanism 90, and a chassis unit 52 that slides along the slide rail 51.
  • the slide rail 51 is laid horizontally along the middle portion of the film 1, and the chassis 52 moves horizontally.
  • the direction in which the slide rail 51 extends is the “X direction” (left and right direction in FIG. 2), and the direction orthogonal to the X direction is the “Y direction” (up and down direction in FIG. 2).
  • one of the X directions (left side in FIG. 2) is “X1” and the other is “X2”
  • one of the Y directions (upward in FIG. 2) is “Y1” and the other is “Y2”.
  • a slide rail 51 and a chassis part 52 are provided on the Y2 direction side of the film 1 and the first split mold 91a.
  • the slide rail 51 and the chassis 52 are provided on the Y1 direction side of the film 1 and the second split mold 91b.
  • the chassis 52 on the slide rail 51 has an origin position P1 for separating the label 10 from the X1 direction to the X2 direction, a charging position P3 for charging the label 10 by the charging unit 80, and the label 10 for the first split mold 91a.
  • the shaping position P2 at which the label 10 is shaped by the shaping unit 70 is located between the origin position P1 and the charging position P3, and the chassis 52 has the origin position P1,
  • the shaping position P2, the charging position P3, and the molding position P4 are moved forward in this order, and the molding position P4, the charging position P3, the shaping position P2, and the origin position P1 are moved back in this order.
  • the chassis portion 52 is provided with the arm portion 60 described above.
  • the arm unit 60 is driven in the Y direction so as to expand and contract. Specifically, an insertion / extraction position where the tip end portion 60a of the arm portion 60 protrudes so as to contact the film 1 or the first split die 91a, and conveyance where the tip end portion 60a is separated from the film 1 or the first split die 91a.
  • the arm portion 60 is driven in and out (reciprocating drive) from the chassis portion 52 so as to switch between the two positions.
  • a suction mechanism suction cup that sucks the label 10 to be held is provided at the distal end portion 60 a of the arm portion 60.
  • the two labels 10 are separated simultaneously. Therefore, two sets of arm portions 60 are provided side by side in the X direction corresponding to each of the two labels 10. Furthermore, since one label 10 is provided with two labels 11, 12, the set of arm portions 60 corresponds to the first arm portion 61 corresponding to the first label 11 and the second label 12. And a second arm portion 62 is provided. In other words, a number of arm portions 61 and 62 corresponding to the number of labels 11 and 12 in one label 10 are provided in the chassis portion 52. In the following description, the description will be given focusing on the pair of arm portions 60. Next, the transport mechanism 50 when the chassis unit 52 is located at each of the positions P1, P2, P3, and P4 will be described in order.
  • the arm part 60 of the chassis part 52 functions as an extraction part that separates the label 10 from the film 1 and takes it out.
  • the chassis section 52 at this time is stopped at the origin position P1.
  • the arm portion 60 is driven to project from the transport position to the insertion / extraction position, and the tip end portion 60 a contacts the label 10.
  • the suction mechanism is activated and the label 10 is sucked to the tip 60a.
  • the arm unit 60 is driven into the transport position from the insertion / extraction position.
  • the label 10 sucked on the leading end 60 a is separated from the film 1.
  • a dotted portion that connects the label 10 and the blank portion 13 is torn off.
  • a stopper 29 that presses the blank portion 13 in a direction opposite to the separation direction of the label 10 is provided.
  • a plate 29 a erected on the chassis 52 side with respect to the film 1 or a pin 29 b protruding from the plate 29 a to the film 1 side can be used.
  • the chassis 52 is provided with an extraction mechanism (extraction portion) provided with the arm portion 60 and its drive mechanism, suction mechanism, stopper 29 and the like.
  • the separated label 10 is accompanied by a minute protrusion-like deformed portion 11 a or a beard-like or burr-like deformed portion 12 a due to, for example, a joint to the blank portion 13 or a defective cutting. Can be formed. Therefore, as described above, the manufacturing apparatus may be provided with the shaping unit 70 described below.
  • the shaping unit 70 shapes the label 10 by removing the deformed portions 11 a and 12 a attached to the label 10.
  • an air gun (fountain unit) 71 that blows off the deformed portion 11a with jetted air and removes it from the label 10, or a burner (flame radiation) that melts the deformed portion 12a with a radiated flame and removes it from the label 10. Part) 72 can be adopted.
  • the deformed portions 11a and 12a of the label 10 are exposed to air and flame continuously discharged from the shaping portion 70, whereby the deformed portions 11a and 12a are removed, and the label 10 being conveyed is shaped.
  • a manufacturing apparatus that employs a method of charging the label 10 is illustrated.
  • the chassis unit 52 when the chassis unit 52 is located at the charging position P ⁇ b> 3, the label 10 being conveyed held by the arm unit 60 passes in the vicinity of the charging unit 80. Thereby, the label 10 is charged. Thereby, after the label 10 is arranged inside the first split mold 91a, the state where the label 10 is stuck to the first split mold 91a is held by Coulomb force.
  • a charging device such as a charging bar or a charging gun can be employed. If the manufacturing apparatus is provided with a suction mechanism for vacuum suction of the label 10 to the mold 91, the charging unit 80 may be stopped or the charging unit 80 may be omitted.
  • the arm part 60 of the chassis part 52 functions as an arrangement part that arranges the label 10 inside the first split mold 91a.
  • the chassis section 52 at this time is stopped at the molding position P4 so as to face the inside of the first split mold 91a.
  • the arm part 60 is driven to project from the transport position to the insertion / extraction position, and the label 10 held at the tip part 60a is inserted into the first split mold 91a and pressed.
  • the operation of the suction mechanism of the arm unit 60 is stopped, and the charged label 10 is stuck inside the first split mold 91a.
  • the first label 11 and the second label 12 forming the label 10 are stuck to predetermined positions inside the first split mold 91a while maintaining the relative arrangement. Therefore, the relative arrangement of the labels 11 and 12 on the film 1 is set in accordance with the relative arrangement of the labels 11 and 12 inside the first split mold 91a of the mold 91. That is, the chassis part 52 is provided with an arrangement mechanism (arrangement part) provided with the arm part 60, its drive mechanism, a suction mechanism, and the like.
  • the arm portion 60 is driven into the transport position from the insertion / extraction position, and the chassis portion 52 moves to the origin position P1.
  • the feeding mechanism 20 feeds the film 1 again, and the labels 10 are fed by two.
  • the molding mechanism 90 supplies the molding material into the mold 91 and attaches the label 10 to the outer wall 2a by in-mold labeling, thereby molding the container 2 in-mold.
  • the container 2 with the label 10 attached thereto is formed by blow molding.
  • a labeled container is formed by injection molding, direct blow molding, stretch blow molding, or the like.
  • the label is placed in the cavity of the molding die so that the low melting point resin layer 1a side of the label faces the cavity side of the die (contacts with the resin of the container material), and then suction is performed. Fix to the inner wall of the mold by static electricity. Next, a resin parison serving as a container molding material is guided between the molds, clamped and then hollow molded by a conventional method, and the mold is opened to form a labeled container in which the label is fused to the surface of the plastic container. .
  • an in-mold label is disposed in a cavity of a female mold so that the low-melting point resin layer 1a side of the label faces the mold cavity side (in contact with the resin of the container material), and then suction or After being fixed to the inner wall of the mold by static electricity and clamped, a resin melt as a container molding material was injected into the mold to form a container, and the mold was opened and the label was fused to the surface of the plastic container. A labeled container is formed. Further, in the differential pressure molding, the in-mold label faces the low melting point resin layer 1a side of the label in the lower female mold cavity of the differential pressure molding mold so as to face the mold cavity side (contact with the resin of the container material).
  • each set of molds 91 is composed of split molds 91a and 91b divided in two in the Y direction, a slide rail 92 extending in the Y direction so as to connect the split molds 91a and 91b is formed by a forming mechanism 90. Will be laid. The split molds 91a and 91b move along the slide rail 92 so as to approach or separate from each other.
  • a supply port 93 for supplying a molten pipe-shaped molding material (plastic raw material, so-called “parison” or “preform”) to the mold 91, and a mold when the mold is closed.
  • An air inlet 94 for blowing air into the mold 91 is provided.
  • These supply port 93 and blow-in port 94 are disposed above the mold 91 (in a direction orthogonal to the X direction and the Y direction, for example, on the front side in FIG. 2).
  • the split molds 91a and 91b may be provided with a suction mechanism for sucking the label 10 to be arranged.
  • the labeled container is formed by the following procedure.
  • a molding material is introduced into the split molds 91a and 91b from the supply port 93, the split molds 91a and 91b are brought close to each other, and the mold is closed to perform blow molding. Then, the cooled split molds 91a and 91b are separated from each other and opened, and the molded labeled container is taken out. Thereafter, a deburring process may be performed on the labeled container.
  • the control unit 100 includes a CPU (Central Processing Unit) 110, a memory 111 such as a ROM (Read Only Memory) and a RAM (Random Access Memory), an HDD (Hard Disk Drive), an SSD (Solid State Drive), and an optical drive. , An external storage device 112 such as a flash memory and a reader / writer, an input device 113 such as a keyboard and a mouse, an output device (display unit) 114 such as a display and a printer, and a communication device 115 that transmits and receives wirelessly or by wire.
  • These devices 110 to 115 are communicably connected to each other via a bus 116 such as a control bus or a data bus provided in the control unit 100.
  • the control unit 100 is a general-purpose computer that can execute the program 117.
  • This program 117 is installed in the external storage device 112.
  • the program 117 may be recorded in a recording medium 118 that can be read by an optical drive, a flash memory, a reader / writer, or the like.
  • the program 117 may be recorded in an online storage on a network to which the control unit 100 can be connected. In any case, it is only necessary that the program 117 can be executed by downloading the program 117 to the external storage device 112 of the control unit 100 or reading the program 117 into the CPU 110 or the memory 111.
  • This manufacturing method is a method of manufacturing a labeled container by the manufacturing apparatus described above.
  • a preparation process step A10) for preparing the film 1 on which the labels 10 are arranged
  • an activation process process step A14
  • Each process is carried out in the order of a transport process (step A20) for transporting 10 and a molding process (step A30) for molding the container 2 using the label 10 transported in the transport process.
  • each process is performed in the order of an extraction process (step A22), a charging process (step A26), and an arrangement process (step A28).
  • the activation process (step A14) when the corona discharge process is performed, it may be performed before the extraction process (step A22), and when the plasma process is performed, before the arrangement process (step A28). It only has to be done.
  • the corona discharge treatment is performed before the removal step (step A22). In the corona discharge treatment, since the treatment is difficult unless the label 10 is in a stable state, the arm portion 60 is taken out. This is because the process is difficult in the unstable state being conveyed by 60.
  • Step A10 printing is performed on the portion of the film 1 that becomes the label 10 in the printing process of Step A12.
  • the labels 10 printed in this manner are fed out as the film 1 is fed out, and are arranged in the longitudinal direction. In this way, the label 10 arranged in the film 1 is prepared.
  • Step A14 the low melting point resin layer 1a of the printed label 10 is activated to improve the wettability of the low melting point resin layer 1a.
  • Step A20 the label 10 is transported by the arm unit 60 of the transport mechanism 50.
  • the label 10 conveyed in the conveyance process is separated from the film 1 by the arm unit 60 in the take-out process of Step A22.
  • the label 10 is charged by the charging unit 80.
  • the charging unit 80 can be omitted.
  • the container 2 with the label 10 attached thereto is molded by the molding mechanism 90.
  • the activation process is performed to give a printing function to the outer surface of the label
  • the activation process Care was taken to ensure that the effect did not affect the sticking surface.
  • the container 2 is formed by molding a polar resin like a plastic bottle
  • the inventor has a parison at the time of attaching the low melting point resin layer 1a of the label 10, that is, in-mold molding. It was discovered that by performing an activation treatment on the surface facing the surface, the sticking surface can be activated to improve the wettability, thereby improving the adhesion between the container 2 and the low melting point resin layer 1a. .
  • the in-mold label of this embodiment has a low melting point resin layer on one surface of a thermoplastic resin film, the low melting point resin layer contains a polyethylene resin, and the melting point of the polyethylene resin is 60 to 110 ° C.
  • the low melting point resin layer has a thickness of 1.5 to 15 ⁇ m, and the surface of the low melting point resin layer is activated.
  • the label 10 used for the manufacturing apparatus of a labeled container mentioned above and the manufacturing method of a labeled container is not limited to the in-mold label of this embodiment, A conventionally well-known various label can be used.
  • fusing point etc.) of resin contained in the low melting point resin layer 1a of the label 10 mentioned above, and the thickness of the low melting point resin layer 1a are not specifically limited.
  • the base layer 1b, the heat seal layer 1a, and the printing layer 1c in the label 10 are sequentially formed of a thermoplastic resin film and a low melting point in the in-mold label of this embodiment.
  • resin layer and ink receiving layer corresponds to resin layer and ink receiving layer.
  • the in-mold label of the present embodiment is used as the label 10
  • the characteristics of the labeled container are relatively improved.
  • a thermoplastic resin film, a low melting point resin layer, an optional ink receiving layer, and the like constituting the in-mold label will be described.
  • thermoplastic resin film is a base layer serving as a support in the in-mold label, and is not particularly limited. It is preferable that the thermoplastic resin film gives the in-mold label a rigidity (stiffness) that allows handling such as printing and insertion in a mold.
  • thermoplastic resin examples include olefin resins such as polypropylene resin, polymethyl-1-pentene, and ethylene-cyclic olefin copolymer; polyester resins such as polyethylene terephthalate resin and polybutylene terephthalate resin; Polyvinyl chloride resin; polyamide resins such as nylon-6, nylon-6,6, nylon-6,10, nylon-6,12; polystyrene; polycarbonate and the like.
  • a polypropylene resin and a polyethylene terephthalate resin are mainly included from the viewpoint of ease of production.
  • the thermoplastic resin contained in the thermoplastic resin film is a polyethylene contained in the low melting point resin layer.
  • a thermoplastic resin having a melting point higher by 15 ° C. or more than the melting point of the base resin is preferable.
  • a thermoplastic resin having a melting point in the range of 130 to 280 ° C. is preferable. Two or more of these thermoplastic resins can be mixed and used.
  • the content ratio of the thermoplastic resin contained in the thermoplastic resin film is not particularly limited, but is usually 55% by mass or more, preferably 60% by mass or more, more preferably 70% by mass or more with respect to the total mass of the thermoplastic resin film. It is usually 100% by mass or less, preferably 98% by mass or less, more preferably 95% by mass or less. If the content rate of a thermoplastic resin is the said range, it will be excellent in the moldability of a thermoplastic resin film, and it has the effect of improving moderate adhesiveness and raising the adhesive strength of a labeled container.
  • the thermoplastic resin film may contain an inorganic fine powder or an organic filler.
  • the thermoplastic resin film By stretching a thermoplastic resin film containing inorganic fine powder, the thermoplastic resin film can be made white opaque. As a result, the visibility of printing provided on the in-mold label can be improved.
  • the label does not stand out in the container with the label and can be displayed as if it was printed directly on the container, so depending on the design of the container and the label Thus, a thermoplastic resin film containing inorganic fine powder and a thermoplastic resin film not containing inorganic fine powder can be properly used.
  • the inorganic fine powder examples include calcium carbonate (preferably heavy calcium carbonate), calcined clay, silica, diatomaceous earth, white clay, talc, titanium oxide (preferably rutile titanium dioxide), barium sulfate, alumina, zeolite, mica, Examples thereof include sericite, bentonite, sepiolite, vermiculite, dolomite, wollastonite, and glass fiber.
  • the inorganic fine powder one whose surface is treated with a fatty acid or the like can be used.
  • the thermoplastic resin film may contain an organic filler. Even when the thermoplastic resin film contains an organic filler, the in-mold label can be whitened and opaqued, and the effect of facilitating the visual recognition of printing is achieved.
  • the organic filler is more than the melting point or glass transition point of the thermoplastic resin mainly contained in the thermoplastic resin film (50% by mass or more based on the total mass of the thermoplastic resin when two or more types of thermoplastic resins are included), A resin having a high melting point or glass transition point is preferable.
  • the organic filler preferably has a melting point or glass transition point of 120 to 300 ° C.
  • Suitable organic fillers include polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate, polyamide, polycarbonate, polystyrene, cyclic olefin homopolymer, ethylene-cyclic olefin copolymer, polyethylene sulfide, polyimide, polymethacrylate, polyethyl ether ketone, Examples include polyphenylene sulfide and melamine resin.
  • thermoplastic resin film one kind selected from inorganic fine powder or organic filler may be used alone, or two or more kinds may be selected and used in combination.
  • the addition ratio of the inorganic fine powder or the organic filler to the total mass of the thermoplastic resin film is preferably 10 to 70% by mass, and more preferably 10 to 60% by mass. 15 to 50% by mass is more preferable.
  • the addition rate of the inorganic fine powder or organic filler is equal to or higher than the lower limit value of the above range, the thermoplastic resin film tends to become white opaque, and the addition rate of the inorganic fine powder or organic filler is less than the upper limit value of the above range. Tends to be uniform.
  • the volume average particle size of the inorganic fine powder or the average dispersed particle size of the organic filler is preferably 0.01 to 15 ⁇ m, more preferably 0.05 to 5 ⁇ m, and more preferably 0.1 to 2 ⁇ m as a volume average particle size by laser diffraction method. 0 ⁇ m is more preferable. Accordingly, there is a tendency that voids are easily obtained by stretch molding, and the in-mold label is easily made opaque.
  • the volume average particle size of the inorganic fine powder or the average dispersed particle size of the organic filler is not less than the lower limit of the above range, the thermoplastic resin film can easily achieve white opacification, and the volume average particle size is the upper limit of the above range.
  • the volume average particle size of the inorganic fine powder and the average dispersed particle size of the organic filler are cumulative values measured by a particle measuring device such as a laser diffraction particle measuring device “Microtrack” (trade name, manufactured by Microtrack Bell Co., Ltd.). Observation of particle diameter corresponding to 50% (cumulative 50% particle diameter), observation of primary particle diameter with a scanning electron microscope (in the present invention, the average value of 100 particles is an average particle diameter), conversion from specific surface area (present invention) Then, the specific surface area was measured using a powder specific surface area measuring device SS-100 manufactured by Shimadzu Corporation).
  • a particle measuring device such as a laser diffraction particle measuring device “Microtrack” (trade name, manufactured by Microtrack Bell Co., Ltd.). Observation of particle diameter corresponding to 50% (cumulative 50% particle diameter), observation of primary particle diameter with a scanning electron microscope (in the present invention, the average value of 100 particles is an average particle diameter), conversion from specific surface area (present invention) Then, the specific
  • thermoplastic resin film is optionally provided with a sterically hindered phenol-based, phosphorus-based, amine-based or sulfur-based antioxidant; a sterically hindered amine-based, benzotriazole-based or benzophenone-based light stabilizer; a dispersant.
  • Additives such as lubricants and antistatic agents can be used. It is preferable to add 0.001 to 1% by mass of each of the above-mentioned various additives individually based on the total mass of the thermoplastic resin film.
  • the thermoplastic resin film may be a single layer or two or more layers. By forming two or more layers, it is possible to impart functions such as white opacification, printing ink acceptability, heat insulation and good in-mold moldability associated therewith to the in-mold label.
  • the thickness of the thermoplastic resin film is preferably 20 to 200 ⁇ m, more preferably 40 to 150 ⁇ m.
  • a suitable transparent thermoplastic resin film it does not contain inorganic fine powder, polypropylene-based unstretched film (CPP film), polypropylene-based biaxially stretched film (BOPP film), polyethylene terephthalate-based An unstretched film (CPET film) and a polyethylene terephthalate biaxially stretched film (BOPET film) are mentioned.
  • Suitable opaque thermoplastic resin films include CPP films, BOPP films, CPET films, BOPET films, and synthetic paper containing inorganic fine powder.
  • Low melting point resin layer The in-mold label of this embodiment has a low melting point resin layer on one surface of a thermoplastic resin film.
  • the low melting point resin layer provides sufficient adhesion strength with a molded product even under low temperature adhesion conditions in stretch blow molding.
  • the thickness of the low melting point resin layer is 1.5 to 15 ⁇ m. When the thickness is 1.5 ⁇ m or more, the adhesive strength is hardly lowered. When the thickness is 15 ⁇ m or less, coloring of the adhesive layer and curling of the label are less likely to occur, and there is no need to deepen the embossing to escape the air that has entered between the label and the container during in-mold molding. It becomes difficult to affect.
  • the thickness of the low melting point resin layer is preferably 2 to 5 ⁇ m, more preferably 2 to 3 ⁇ m.
  • the melting point of the polyethylene resin contained in the low melting point resin layer is 60 to 110 ° C.
  • the melting point is 60 ° C. or more, blocking (particularly cut blocking) is difficult to occur, and when the melting point is 110 ° C. or less, the low melting point resin layer is easily melted during in-mold molding, and the adhesive strength is easily increased.
  • the melting point of the polyethylene resin contained in the low melting point resin layer is preferably 70 to 100 ° C, more preferably 75 to 90 ° C.
  • the polyethylene resin contained in the low melting point resin layer may be a homopolymer of ethylene or a copolymer of ethylene and a monomer copolymerizable with ethylene.
  • the polyethylene resin contained in the low melting point resin layer is preferably a copolymer of ethylene and a monomer copolymerizable with ethylene.
  • Monomers copolymerizable with ethylene include ⁇ -olefins having 3 to 10 carbon atoms (preferably 3 to 8 carbon atoms), monomers having no hetero atom such as styrene; vinyl acetate, (meth) acrylic acid, alkyl groups And a monomer having a hetero atom such as (meth) acrylic acid alkyl ester having 1 to 8 carbon atoms and maleic anhydride. From the viewpoint of improving water resistance, it is preferable that the polyethylene-based resin does not basically have a hetero atom. From the viewpoint of improving water resistance, it is preferable to contain 95 mol% or more, more preferably 97 mol% or more of a monomer-derived structural unit having no hetero atom.
  • the polyethylene-based resin preferably contains 5 mol% or less of a structural unit derived from a monomer having a hetero atom, more preferably 3 mol% or less, and particularly preferably does not contain at all.
  • a polyethylene-type resin contains 80 mol% or more of structural units derived from ethylene.
  • the polyethylene resin more preferably contains 95 mol% or more and less than 100 mol% of structural units derived from ethylene, and particularly preferably contains 97 mol% or more and less than 100 mol%.
  • the structural unit derived from a monomer copolymerizable with ethylene is included more than 0 mol% and 5 mol% or less, and more preferably more than 0 mol% and 3 mol% or less.
  • the content of the polyethylene resin contained in the low melting point resin layer is not particularly limited, but is usually 70% by mass or more, preferably 80% by mass or more, more preferably 90% by mass with respect to the total mass of the low melting point resin layer. % Or more, and usually 100% by mass or less. If the content rate of a polyethylene-type resin is the said range, the adhesive strength of a labeled container will be excellent.
  • low density polyethylene low density polyethylene
  • linear low density polyethylene linear low density polyethylene
  • ethylene-propylene copolymer ethylene-propylene copolymer
  • linear low density polyethylene is most preferable.
  • These polyethylene resins may be used alone or in combination of two or more.
  • the linear low density polyethylene include those synthesized by a multisite catalyst typified by a Ziegler type catalyst and those synthesized by a single site catalyst typified by a metallocene catalyst. From the viewpoint of controlling the melting point of the polyethylene resin contained in the low melting point resin layer within the above range, those synthesized by a single site catalyst are preferable.
  • transition metals such as Zr, Ti, Hf and cyclopentadi
  • metallocene catalyst consisting of an unsaturated ring such as an enyl ring or an indenyl ring
  • the ratio Mw / Mn between the weight average molecular weight and the number average molecular weight of the linear low density polyethylene is preferably 3.5 or less.
  • additives such as antioxidants, lubricants, antiblocking agents, and antistatic agents can be blended with the polyethylene-based resin as necessary.
  • the surface of the low melting point resin layer has irregularities from the viewpoint of promptly discharging air that has entered between the label and the parison during in-mold molding.
  • the embossing roll can be preferably used.
  • the surface of the low melting point resin layer is activated in the state of the in-mode label.
  • the activation treatment of the surface of the low melting point resin layer is as described in detail in the activation treatment section of the labeled container manufacturing apparatus.
  • the surface tension of the surface of the low melting point resin layer or the number of oxygen atoms / number of carbon atoms by the X-ray photoelectron spectroscopy (XPS) method of the surface of the low melting point resin layer
  • XPS X-ray photoelectron spectroscopy
  • the in-mold label concerning this embodiment has an ink receiving layer as a printing layer in the surface in which a thermoplastic resin film does not have a low melting-point resin layer.
  • the ink receiving layer has the effect of improving the printability of the in-mold label, particularly the ink transferability and the ink adhesion.
  • the ink receiving layer preferably contains a binder and / or an antistatic agent.
  • the ink receiving layer preferably further contains a cross-linking agent.
  • the ink receiving layer can contain an antiblocking agent, a colorant, an antifoaming agent, an antifungal agent, a lubricant, and the like, if necessary.
  • the binder is not particularly limited as long as it has adhesiveness and can be applied to the surface of the thermoplastic resin film.
  • binders include ethylene / vinyl acetate copolymers, ethylene / (meth) acrylic acid copolymers and metal salts thereof (Zn, Al, Li, K, Na, etc.), ethylene / (meth) acrylic acid (C1-8).
  • Ethylene copolymers such as alkyl ester copolymers; acid-modified polyolefins such as maleic acid-modified polyethylene, maleic acid-modified polypropylene, maleic acid-modified ethylene / vinyl acetate copolymers; monohydroxy (C3-6) alkyl-modified polyethylene Hydroxyl-modified polyolefin such as chlorinated polyolefin; Polyurethane such as polyester polyurethane and polycarbonate polyurethane; Polyethyleneimine such as polyethyleneimine and poly (ethyleneimine-urea) and its modified product; Ethyleneimine adduct of polyamine polyamide, polyamine Polyamide various (alkyl, cycloalkyl, aryl, aralkyl, benzyl, cyclopentyl) include modified polyamine polyamide modified products and the like.
  • a water dispersible (emulsion) binder can be selected.
  • the content of the binder contained in the ink receiving layer is not particularly limited, but is usually 30% by mass or more, preferably 40% by mass or more, more preferably 50% by mass or more, and usually 100% with respect to the total mass of the ink receiving layer. It is not more than mass%, preferably not more than 99.5 mass%.
  • the antistatic agent may be applied to any layer of the in-mold label when the label holding method in the mold is a vacuum suction type, but the label holding method in the mold is an electrostatic adsorption type Is applicable to the surface of the in-mold label 10 that does not have a low melting point resin layer.
  • the label holding method in the mold is an electrostatic adsorption type Is applicable to the surface of the in-mold label 10 that does not have a low melting point resin layer.
  • the antistatic agent include low molecular weight organic compounds, conductive inorganic compounds, so-called electronic conductive polymers, nonionic polymer type antistatic agents, quaternary ammonium salt type copolymers, and alkali metal salt-containing polymers. .
  • low molecular weight organic compounds such as stearic acid monoglyceride, alkyldiethanolamine, sorbitan monolaurate, alkylbenzene sulfonate, and alkyl diphenyl ether sulfonate; ITO (indium doped tin oxide), ATO (antimony doped tin oxide) ), Conductive inorganic compounds such as graphite whiskers; so-called electron conductive polymers that exhibit conductivity by pi electrons in the molecular chain such as polythiophene, polypyroyl, polyaniline; polyethylene glycol, polyoxyethylene alkyl ether, polyoxyethylene diamine, etc.
  • Nonionic polymer type antistatic agent quaternary ammonium salt type copolymer such as polyvinylbenzyltrimethylammonium chloride, polydimethylaminoethyl methacrylate quaternized product, etc. Body; alkali metal salt-containing polymers such as an alkali metal ion additives, etc. to the alkylene oxide group and / or hydroxyl group-containing polymer.
  • the surface resistivity of the surface of the in-mold label to which the antistatic agent is applied is preferably 1 ⁇ 10 2 ⁇ to 1 ⁇ 10 13 ⁇ , and more preferably 1 ⁇ 10 6 ⁇ to 1 ⁇ 10 12 ⁇ .
  • the content ratio of the antistatic agent contained in the ink receiving layer is not particularly limited, but is usually 10% by mass or more, preferably 15% by mass or more, more preferably 20% by mass or more, based on the total mass of the ink receiving layer. Usually, it is 50 mass% or less, Preferably it is 40 mass% or less.
  • Crosslinking agent reacts with the binder and / or antistatic agent, or encapsulates the binder and / or antistatic agent in the network formed by the crosslinking agent, and the binder and / or antistatic agent is placed on the surface of the in-mold label. It works to fix to. As a result, for example, there is an effect of improving adhesion and water resistance of printing applied to the in-mold label.
  • crosslinking agent examples include bifunctional or higher functional materials having a hydroxyl group, a carboxyl group, an epoxy group, an isocyanate group, an aldehyde group, an oxazoline skeleton, a carbodiimide skeleton, and the like as a reactive functional group.
  • bifunctional or higher functional materials having a hydroxyl group, a carboxyl group, an epoxy group, an isocyanate group, an aldehyde group, an oxazoline skeleton, a carbodiimide skeleton, and the like as a reactive functional group.
  • bisphenol A-epichlorohydrin resin, polyamine polyamide epichlorohydrin resin, aliphatic epoxy resin, epoxy novolac resin, alicyclic epoxy resin, brominated epoxy resin, etc. are preferable, and polyamine polyamide epichlorohydrin adduct, monofunctional to polyfunctional glycidyl. Ethers and glycidyl esters are more preferred.
  • the content ratio of the crosslinking agent contained in the ink receiving layer is not particularly limited, but is usually 15% by mass or more, preferably 20% by mass or more, and usually 45% by mass or less, preferably 40% with respect to the total mass of the ink receiving layer. It is below mass%. If the content rate of a crosslinking agent is the said range, the adhesiveness and water resistance of printing ink can be improved.
  • thermoplastic resin film can also be made into a multilayer structure.
  • examples of the method for forming a single layer film include extrusion molding (cast molding) using a T die, inflation molding using an O die, and calendar molding using a rolling roll.
  • the T die and the O die are configured as a multilayer die. Then, the thermoplastic resin composition used for each layer is supplied to different extruders and melted, and the thermoplastic resin composition discharged from each extruder is supplied to the multilayer die and laminated in the die. Discharge in film form.
  • the method for laminating the low melting point resin layer on one surface of the thermoplastic resin film is not particularly limited, and examples thereof include a co-extrusion method, an extrusion laminating method, a film laminating method, a coating method, a dry laminating method and a thermal laminating method. It is done.
  • a thermoplastic resin composition for a thermoplastic resin film and a thermoplastic resin composition for a low melting point resin layer are supplied to the multilayer die, Since lamination and extrusion are performed, lamination is performed simultaneously with molding.
  • thermoplastic resin film is formed first, and a molten low melting point resin layer is laminated thereon. Therefore, the molding and lamination are performed in separate steps.
  • the thermoplastic resin film and the low melting point resin layer are respectively formed into a film and the both are bonded through an adhesive.
  • the application method is a method of applying a thermoplastic resin composition for a low melting point resin layer to one surface of a thermoplastic resin film.
  • a low melting point resin layer is formed by dissolving a thermoplastic resin composition for a low melting point resin layer in a solvent to form a coating liquid and drying the thermoplastic resin composition applied to the thermoplastic resin film. Therefore, lamination is performed simultaneously with molding.
  • the low melting point resin layer can be formed into a multilayer by using a dry laminating method or a thermal laminating method.
  • a dry laminating method By these methods, the low-melting point resin layer and the thermoplastic resin film are strongly adhered and integrally provided.
  • the coextrusion method is preferable from the viewpoint that each layer can be firmly bonded.
  • thermoplastic resin film and the low melting point resin layer may be unstretched, or may be stretched in at least a uniaxial direction.
  • the shape following property of the labeled container can be improved.
  • the thermoplastic resin film is stretched, it is lightweight and excellent in thickness uniformity.
  • Stretching methods include longitudinal stretching using the peripheral speed difference of the roll group, rolling, lateral stretching using a tenter oven, sequential biaxial stretching combining longitudinal stretching and lateral stretching, and simultaneous use of a combination of a tenter oven and a linear motor. Biaxial stretching, simultaneous biaxial stretching by a combination of a tenter oven and a pantograph can be exemplified.
  • simultaneous biaxial stretching by adjustment of the amount of blowing air can be mentioned.
  • the draw ratio at the time of drawing is not particularly limited, and is appropriately determined in consideration of the physical properties of the in-mold label, the drawing characteristics of each layer (particularly the thermoplastic resin film), and the like.
  • the stretching ratio in the case of uniaxial stretching is preferably 1.2 to 12 times, more preferably 2 to 10 times.
  • the area magnification is preferably 1.5 to 60 times, more preferably 4 to 50 times.
  • the stretching ratio is preferably 1.2 to 10 times, more preferably 2 to 5 times in the case of uniaxial stretching.
  • the area magnification is preferably 1.5 to 20 times, and more preferably 4 to 12 times.
  • the stretching temperature is appropriately determined in consideration of the stretching characteristics of each layer (particularly the thermoplastic resin film). Among them, the temperature is preferably from the glass transition temperature of the thermoplastic resin mainly contained in the thermoplastic resin film to the melting point of the crystal part.
  • the thermoplastic resin mainly contained in the thermoplastic resin film is a propylene homopolymer (melting point: 155 to 167 ° C.)
  • the stretching temperature is preferably 1 to 70 ° C. lower than the melting point.
  • the stretching temperature is preferably 100 to 166 ° C.
  • the stretching speed is preferably 20 to 350 m / min.
  • the label when the label is placed on the mold 90 by the arm portion 60, the label may be bent. It becomes difficult to enter.
  • the formation of the deformed portions 11a and 12a can be suppressed by setting the stretching direction according to the contour shape of the label. For example, the label 10 installed in the feeding mechanism 20 is stretched in the X direction.
  • the ink receiving layer is preferably formed by applying a coating liquid.
  • the solvent that forms the coating liquid is water; water-soluble solvents such as methyl alcohol, ethyl alcohol, isopropyl alcohol, acetone, and methyl ethyl ketone; water-insoluble solvents such as ethyl acetate, toluene, and xylene from the viewpoint of easy process control Is mentioned.
  • the coating liquid is preferably used in the form of a solution or dispersion by uniformly dissolving or dispersing the above components such as a binder in the above solvent.
  • the solid content concentration in the coating liquid is preferably 0.1% by mass or more, and more preferably 0.2% by mass or more. Moreover, 20 mass% or less is preferable from a viewpoint of obtaining a uniform coating surface, and 10 mass% or less is more preferable.
  • the coating method examples include a method using a coating apparatus such as a gravure coater, a micro gravure coater, a reverse coater, a blade coater, a Mayer bar coater, and an air knife coater.
  • a coating apparatus such as a gravure coater, a micro gravure coater, a reverse coater, a blade coater, a Mayer bar coater, and an air knife coater.
  • the low melting point resin layer is applied to the surface on which the thermoplastic resin film coating liquid is applied in advance from the viewpoint of uniform coating while suppressing the repelling of the coating liquid. It is preferable to perform activation treatment exemplified by corona discharge treatment similar to the surface. Moreover, it is also preferable to apply the coating liquid on one side of the thermoplastic resin film in advance and dry the coating layer to remove the solvent.
  • Ink receiving layer is more that is preferably 0.01g / m 2 ⁇ 7g / m 2 as a solid coating amount per one side after drying, is 0.01g / m 2 ⁇ 5g / m 2 0.05 g / m 2 to 3 g / m 2 is particularly preferable.
  • the coating amount of the ink receiving layer is within the above range, the transferability and adhesion of the ink are improved. If the coating amount of the ink receiving layer is less than or equal to the above upper limit value, the in-mold label is unlikely to curl, and ink adhesion is unlikely to decrease due to cohesive failure in the ink receiving layer. On the other hand, when the coating amount of the ink receiving layer is equal to or more than the above lower limit, the transferability and adhesion of the ink are easily developed.
  • the in-mold label can be printed. Usually, it can print on the surface which does not provide the low melting point resin layer of a thermoplastic resin film. Examples of the print information include a barcode, a manufacturer, a sales company name, a character, a product name, and a usage method. Also, printing can be performed on the low melting point resin layer.
  • the thermoplastic resin film is transparent, since the printed information of the low melting point resin layer is not in the outermost layer in the labeled container, the effect of excellent durability is achieved. Further, when the thermoplastic resin film is opaque, the printing information cannot be visually recognized in the container with the label, and the printing can be visually recognized when the label is broken.
  • the printing method examples include gravure printing, offset printing, flexographic printing, seal printing, and screen printing.
  • the in-mold label may be decorated with a transfer foil, a hologram, or the like. Security elements such as threads are also included in the decoration. You may give both printing and decoration.
  • the in-mold label is preferably separated into a necessary shape and size by punching before or after printing and decoration. From the viewpoint of not easily damaging printed and decorated information, it is preferable to perform punching after printing and decoration.
  • the punched in-mold label may be affixed to the entire surface of the plastic container, or may be a partial affixed partly.
  • the in-mold label may be used as a blank label surrounding the side surface of a cup-shaped plastic container attached by injection molding, or the surface of a bottle-shaped plastic container attached by hollow molding It may also be used as a label attached to the back surface.
  • the in-mold label of this embodiment is stuck on the surface of a polar resin container.
  • the method of in-mold molding that is, the method of attaching an in-mold label to the surface of the polar resin container.
  • the in-mold label of this embodiment uses a low-melting resin layer containing a polyethylene-based resin that basically has no heteroatoms (which is a nonpolar resin), the surface of the low-melting resin layer Has a property of being attached (preferably heat-sealed) to a polar resin (for example, a polyester resin typified by polyethylene terephthalate).
  • Examples of the method for forming a polar resin container include stretch blow molding in which a preform heated as a parison is used and pressed onto a mold inner wall with a rod and compressed air.
  • the in-mold label of this embodiment is particularly useful for stretch blow molding because of its high adhesive strength even under low temperature bonding conditions for stretch blow molding.
  • the in-mold label of this embodiment can be used not only for stretch blow molding but also for direct blow molding, injection molding, differential pressure molding, and the like. Below, the preferable aspect of the container with a label of this embodiment is demonstrated.
  • a polar resin is used as the material of the container.
  • the polar resin used for the container material include polyester resins such as polyethylene terephthalate, polybutylene terephthalate, polybutylene succinate, and polylactic acid.
  • specific examples of the material used for the container include polycarbonate resin, acrylonitrile-styrene (AS) resin, acrylonitrile-butylene-styrene (ABS) resin, methyl Other polar resins such as methacrylate-styrene (MS) resin are also included.
  • the container may be transparent and / or natural color containing no pigments or dyes, and may be opaque and / or colored containing pigments or dyes.
  • the body of the container may have a perfect cross section or may be oval or rectangular. When the body has a rectangular cross section, the corners preferably have a curvature. From the viewpoint of strength, the cross section of the body is preferably a perfect circle or an elliptical shape close to a perfect circle, and more preferably a perfect circle. Further, the size of the container is not particularly limited.
  • the labeled container preferably has the following characteristics.
  • the adhesive strength between the polar resin container and the in-mold label is measured in accordance with JIS K6854-2: 1999 “Adhesive—Peeling adhesive strength test method—Part 2: 180 degree peeling”.
  • the adhesive strength is preferably 2N / 15 mm or more, more preferably 4N / 15 mm or more, and further preferably 5N / 15 mm or more.
  • the upper limit of the adhesive strength is not particularly limited, but is preferably 15 N / 15 mm or less from the cohesive fracture strength of the resin constituting the low melting point resin layer.
  • the label is attached to the container by in-mold labeling, “T 2 ” of the height dimension of the label is suppressed.
  • the ratio T 1 : T 2 between “T 1 ” which is the dimension in the thickness direction of the label and “T 2 ” which is the height dimension of the step of the label is in the range of 50:50 to 100: 0. Is preferred.
  • thermoplastic resin film material As a thermoplastic resin film material, a thermoplastic resin composition of PP-1 shown in Table 1 with 84% by mass, CA-1 at 15% by mass, and TI-1 at 1% by mass was melted in an extruder heated to 230 ° C. The mixture was kneaded and supplied to a two-layer die.
  • PE-1 shown in Table 1 as a material for the low melting point resin layer was melt kneaded with an extruder heated to 210 ° C. and supplied to a two-layer die. The material of the thermoplastic resin film and the material of the low melting point resin layer were laminated in a two-layer die and extruded from the T die as a two-layer film having two types of layers.
  • This unstretched sheet was heated to 150 ° C. and stretched 5 times in the longitudinal direction.
  • it is again heated to a temperature of 150 ° C., stretched 8 times in the transverse direction with a tenter, annealed at a temperature of 160 ° C., cooled to a temperature of 60 ° C., A white opaque biaxially oriented polyolefin-based laminated resin film having a two-layer structure was obtained.
  • the resulting white opaque biaxially stretched polyolefin-based laminated resin film having a two-layer structure had a thickness of 70 ⁇ m and a density of 0.76 g / cm 3 .
  • the low melting point resin layer had a thickness of 2.0 ⁇ m and a surface tension of 64 mN / m.
  • the white opaque biaxially stretched polyolefin-based laminated resin film having this two-layer structure was used as the in-mold label of Example 1.
  • Example 2 In Example 1, the composition of the thermoplastic resin composition for a thermoplastic resin film was changed to that without inorganic fine powder as shown in Table 2 to obtain a colorless and transparent biaxially stretched polyolefin-based laminated resin film. This colorless and transparent biaxially stretched polyolefin-based laminated resin film was used as the in-mold label of Example 2.
  • Example 3 In Example 1, the resin for the low melting point resin layer was changed to PE-2 having a melting point of 90 ° C. as shown in Table 2 below to obtain a white opaque biaxially oriented polyolefin-based laminated resin film. This white opaque biaxially oriented polyolefin-based laminated resin film was used as the in-mold label of Example 3. In comparison with Example 3 and Example 1 in the adhesive strength test results described later, Example 1 using PE-1 having an ethylene copolymerization ratio of 95% or more has an ethylene copolymerization ratio of 95. It was shown that the adhesive strength was higher than that of Example 3 using PE-2 of less than%.
  • Reference examples 1 and 2 are shown below.
  • an in-mold label of Reference Example 1 was produced in the same manner as in Example 1 except that the thickness of the low melting point resin layer in the in-mold label of Example 1 was changed.
  • an in-mold label of Reference Example 2 was produced in the same manner as in Example 1 except that the polyethylene resin contained in the low melting point resin layer in the in-mold label of Example 1 was changed.
  • Example 1 the in-mold label of Reference Example 1 in which the thickness of the low melting point resin layer was 0.8 ⁇ m was produced by narrowing the supply amount of the low melting point resin layer to the two-layer die.
  • the adhesive strength was lower than the adhesive strength measured in Example 1.
  • the in-mold label attached to the container can be easily peeled depending on the thickness of the low-melting point resin layer, regardless of whether it is immersed in water or not immersed in water (dry conditions). It can be seen that it can be granted. Therefore, the in-mold label of Reference Example 1 is useful when obtaining a labeled container excellent in easy peelability. Further, according to Reference Example 1, the low melting point resin layer was filled between the label and the container, and the thickness of the low melting point resin layer suitable for obtaining excellent adhesive strength was shown. Further, Reference Example 1 shows that the adhesive strength between the label and the container and the water peel resistance are relatively improved by the thickness of the low melting point resin layer in the in-mold label.
  • Example 2 the polyethylene resin used for the low-melting point resin layer had a melting point of 81 ° C. and PE-3 having a melting point of 115 ° C. was used in the same manner as in Example 1, except that PE-3 was used. 2 in-mold labels were produced. When the labeled container was manufactured using the in-mold label of Reference Example 2 as described later in the adhesive strength test results, the adhesive strength was lower than the adhesive strength measured in Example 1. Moreover, it was shown that a label peels in a short time compared with the labeled container of Example 1 as a result of a water-resistant peeling test.
  • Reference Example 2 showed the critical point of the melting point (melting peak temperature) of the polyethylene resin suitable for filling the low melting point resin layer between the label and the container and melting the low melting point resin layer. . Furthermore, Reference Example 2 showed that the adhesive strength between the label and the container and the water peel resistance were relatively improved by the melting point of the polyethylene resin contained in the low melting point resin layer.
  • Example 1 and Reference Example 2 when Example 1 and Reference Example 2 are compared, the melting point of a polyethylene resin suitable for stretch blow molding conditions (conditions in which the parison has less heat than in direct blow molding) can be found.
  • the temperature of the parison In direct blow molding, the temperature of the parison is 250 to 270 ° C. Therefore, even if the in-mold label of Reference Example 2 is used, the low melting point resin layer is sufficiently melted and a labeled container having excellent adhesive strength can be obtained.
  • Comparative Examples 2 and 3 are shown below.
  • in-mold labels of Comparative Examples 2 and 3 were produced in the same manner as Reference Examples 1 and 2, except that the corona discharge treatment was not performed.
  • the adhesive strength test described later when a labeled container was manufactured using the in-mold labels of Comparative Examples 2 and 3, sufficient adhesive strength was not obtained.
  • the label and the container are relatively bonded depending on whether or not the low melting point resin layer is activated. It was shown that strength and water peel resistance were improved.
  • ⁇ Evaluation method> [In-mold label properties] (Thickness of each layer)
  • the thickness (total thickness) of the in-mold label was measured using a constant pressure thickness measuring instrument (trade name: PG-01J, manufactured by Teclock Co., Ltd.) according to JIS K7130: 1999.
  • the thickness of each layer in the in-mold label is determined by cooling the sample to be measured to a temperature of ⁇ 60 ° C. or less with liquid nitrogen and placing it on a glass plate with a razor blade (manufactured by Sick Japan Co., Ltd.).
  • Powder toner (model number: TK-571M, manufactured by Kyocera Mita, plus charge type) and glass beads with a particle diameter of 2.5 mm are placed in a PP screw bottle (50 ml), and the bottle is shaken by hand for 3 minutes. The aggregate was crushed. The obtained toner was sprinkled on the surface of the low melting point resin layer of the in-mold label, and the presence or absence of a corona discharge treatment trace was visually confirmed and judged according to the following criteria.
  • Existence Toner adheres to the surface of the low melting point resin layer of the in-mold label, and the pattern appears to float. No: Toner does not adhere to the surface of the low melting point resin layer of the in-mold label. Alternatively, the toner adheres to the surface of the low melting point resin layer of the in-mold label, but the pattern does not appear.
  • the in-mold label was installed so that the long side of the label was stuck in parallel to the circumferential direction of the body of the resin molded body in the mold.
  • the mold was controlled so that the surface temperature on the cavity side was in the range of 20 to 45 ° C.
  • a polyethylene terephthalate preform was preheated to 100 ° C. Then, the preform leads to a mold, under a blow pressure of 5 ⁇ 40kg / cm 2, and stretch blow molding 1 second. Then, it cooled to 50 degreeC in 15 seconds.
  • the mold was opened, and the labeled container having a square body having a height of 12 cm and a side of about 7 cm was taken out.
  • the labeled container to be measured was stored for 2 days in an environment of a temperature of 23 ° C. and a relative humidity of 50%.
  • the container wall and the label of the label sticking part are cut together with a cutter, and the length of the circumferential direction of the container body is 12 cm (the sticking part of the label is 9 cm, the non-sticking part is 3 cm) and A total of 6 samples for measurement having a width of 1.5 cm (with labels attached to the entire width) were collected from two containers.
  • the label was carefully peeled off from the gripping (unlabeled) part and peeled about 1 cm to form an adhesive part for gripping.
  • the material MFR (melt flow rate according to JIS K7210: 1999), melting point (melting peak temperature according to JIS K7121: 1987), ethylene content, density, and volume average particle diameter of inorganic fine powders were used as catalog values for each material. .
  • Example 101 “Epomin SP-003” manufactured by Nippon Shokubai Co., Ltd. and “Saftmer ST-1000” manufactured by Mitsubishi Chemical Co., Ltd. were mixed to prepare a paint for an ink receiving layer having a solid content concentration of 3 mass%.
  • the paint is applied to the thermoplastic resin film side of the white opaque biaxially stretched polyolefin-based laminated resin film having the two-layer structure prepared in Example 1 with a Mayer bar # 8, and dried at 80 ° C. for 45 seconds to receive ink. A layer was provided.
  • the modification regarding the arm part 60 is described.
  • the chassis unit 52 provided with the arm units 61 and 62 corresponding to the number of labels 11 and 12 in one label 10 has been described. May be used.
  • the arm portion used in this case is provided with a tip portion having a size overlapping with all of the plurality of labels in a side view.
  • a punching grille also referred to as “punching plate” having a large number of holes can be used.
  • more arm portions may be provided than the number of labels 11 and 12 in one label 10.
  • a plurality of arm portions may be provided for one label 11, 12.
  • the label may be attracted to the arm portion not only by suction but by static electricity. In this case, since the label can be charged, it is not necessary to provide a charging portion.
  • a sheet-like label 9 in a state of being stacked on the stacker 8 may be provided.
  • a gantry 54 that supports the stacker 8 and the above-described feeding mechanism 20 is provided, and a switching mechanism (switching unit) 55 that switches the take-out destination of the labels 9 and 10 is provided.
  • the stacker 8 provided above the feeding mechanism 20 is illustrated.
  • the switching mechanism 55 is provided with a moving mechanism 56 that moves the gantry 54 up and down. That is, the switching mechanism 55 switches the stage (vertical direction position) from which the labels 9 and 10 are taken out.
  • the stage to which the labels 9 and 10 are taken out is switched without switching the stage of the transport mechanism 50.
  • the label 10 of the feeding mechanism 20 facing the arm unit 60 of the chassis unit 52 can be taken out, and the gantry 54 is moved downward to move the arm unit
  • the label 9 of the stacker 8 facing 60 can be taken out. Therefore, the labels 9 and 10 used on the front side of the container 2 can be switched alternatively.
  • the sheet-like label 9 is stuck on the front side and the label separated from the film is stuck on the back side 2 can also be molded. That is, the sheet-like label 9 and the label 10 separated from the film can be used together in one container 2.
  • Such a switching process by the switching mechanism 55 may be performed in parallel with the winding process.
  • the switching mechanism may switch the stage of the transport mechanism 50 instead of or in addition to switching the stage from which the labels 9 and 10 are taken out.
  • it may be a switching mechanism in which a slide rail extending vertically is provided and the chassis 52 slides up and down along the slide rail.
  • the label 10 when the chassis part 52 is located at the lower part, the label 10 can be separated from the long film 1 as described above, and when it is located at the upper part, the sheets stacked by the stacker 8 can be separated.
  • the leaf-shaped label 9 can be taken out.
  • the extending direction of the rotating shafts 21 and 22 in the feeding mechanism 20 and the direction in which the feeding mechanism 20 and the stacker 8 are arranged are not limited to the vertical direction, but are set in various directions according to the surrounding configuration and required specifications.
  • the transport mechanism 50 is not limited to a mechanism in which the chassis 52 slides along the rail 51 and the labels 9 and 10 reciprocate linearly.
  • suction cups and electrostatic parts may be intermittently arranged on the rotating disk-shaped outer peripheral end, and the labels 9 and 10 may be attracted by these suction cups and electrostatic parts. In this case, the labels 9 and 10 are conveyed while rotating.
  • a suction cup or an electrostatic part may be arranged at the tip of a multi-axis robot arm such as a four-axis robot or a six-axis robot, and the labels 9 and 10 may be attracted by these suction cups or electrostatic parts.
  • the labels 9 and 10 can be transported along a free path.
  • the relative arrangement can be changed and transported. Therefore, the material cost can be suppressed by printing the label 10 on the film 1 with high density.
  • the relative arrangement of the plurality of labels 11 and 12 may be set differently in the extraction process (extraction part) and the arrangement process (arrangement part).
  • the plurality of labels 11, The interval of 12 can be narrowed.
  • the material cost of the film 1 can be reduced by reducing the margins by devising the pattern allocation (also referred to as imposition) when printing on the long film 1.
  • each of the plurality of labels 11 and 12 forming the label group 10 is separated from the film 1 in the take-out process. It is necessary to dispose the labels 11 and 12 that are separated and taken out of the relative disposition.
  • the arm portions 60 for sucking each of the plurality of labels 11 and 12 need to move independently.
  • each arm unit 60 is preferably configured as an arm of an independent multi-axis robot or connected to this arm.
  • the relative arrangement of the plurality of labels 11 and 12 is set to be different between the extraction process and the arrangement process
  • the relative positions of the plurality of labels 11 and 12 in the extraction process and the plurality of labels 11 in the arrangement process. , 12 are stored in advance in the external storage device 112, and the relative arrangement of the labels 11, 12 in the take-out process is changed to the relative arrangement of the labels 11, 12 in the arrangement process.
  • 12 are preferably computer controlled so that the multi-axis robot is arranged in the mold 91. Further, it is preferable that a program 117 that causes the control unit 100 to execute this control is stored in the external storage device 112.
  • control target of the control unit 100 is not limited to the arm unit 60, but may be other units such as the printing unit 30, the feeding mechanism 20, and the transport mechanism 50. You may control the whole.
  • the program 117 may execute a control process for individually controlling each unit of the manufacturing apparatus or a control process for controlling the entire control apparatus.
  • the charging unit 80 may be omitted. In this case, the apparatus configuration can be simplified.
  • the label 10 is preferably discharged. This is because when the label 10 is charged, the electrostatic force affects the suction holding, and the holding position of the label 10 in the mold 91 may be shifted from the normal position.
  • the example in which the present invention is applied to the label 10 arranged in the longitudinal direction of the film 1 is subjected to the activation treatment.
  • the present invention is activated to a sheet-like label. It is applicable also to what performs a process.
  • the labeled container, the labeled container manufacturing apparatus, and the labeled container manufacturing method of the present invention using a film having a polyethylene-based resin as an adhesive layer that cannot be bonded to polyester with conventional common sense It becomes possible to bond to a polyester container, and a molded product having sufficient adhesive strength with the molded product can be obtained even under low temperature bonding conditions by stretch blow molding. Therefore, it becomes possible to manufacture an in-mold label for both a polyester container and a polyolefin container, which greatly contributes to cost reduction in the field.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)

Abstract

L'invention concerne un appareil de production de récipient étiqueté avec lequel il est possible de sélectionner une résine non polaire pour la couche de résine à bas point de fusion d'une étiquette et de fixer ladite étiquette à un récipient constitué d'un matériau de résine polaire. L'appareil comporte : une section de récupération 60 pour récupérer une étiquette 10 avec une couche de résine à bas point de fusion; une section de placement 60 pour disposer l'étiquette 10 récupérée par la section de récupération 60 à l'intérieur d'un moule 91 avec la couche de résine à bas point de fusion tournée vers l'intérieur; une unité de moulage 90 pour amener un matériau de moulage dans le moule 91 pour former un récipient dans lequel l'étiquette 10 disposée à l'intérieur du moule 91 par la section de placement 60 est fixée sur la paroi externe par la couche de résine à bas point de fusion; et une unité d'activation 200 pour activer la couche de résine à bas point de fusion avant que l'étiquette 10 soit disposée à l'intérieur du moule 91 par la section de placement 60.
PCT/JP2017/034638 2016-09-29 2017-09-26 Étiquette dans le moule, récipient étiqueté, et appareil de production et procédé de production pour récipient étiqueté WO2018062128A1 (fr)

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