WO2021225070A1 - シュリンクラベルからのインキ層の除去方法 - Google Patents

シュリンクラベルからのインキ層の除去方法 Download PDF

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Publication number
WO2021225070A1
WO2021225070A1 PCT/JP2021/015823 JP2021015823W WO2021225070A1 WO 2021225070 A1 WO2021225070 A1 WO 2021225070A1 JP 2021015823 W JP2021015823 W JP 2021015823W WO 2021225070 A1 WO2021225070 A1 WO 2021225070A1
Authority
WO
WIPO (PCT)
Prior art keywords
shrink label
shrink
ink layer
alkaline
film
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2021/015823
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English (en)
French (fr)
Japanese (ja)
Inventor
彰 宮崎
周太郎 黒澤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fuji Seal International Inc
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Fuji Seal International Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fuji Seal International Inc filed Critical Fuji Seal International Inc
Priority to JP2022519923A priority Critical patent/JP7716392B2/ja
Publication of WO2021225070A1 publication Critical patent/WO2021225070A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
    • B29B17/02—Separating plastics from other materials
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/62—Plastics recycling; Rubber recycling

Definitions

  • This disclosure relates to a method for removing an ink layer from a shrink label.
  • PET bottles polyethylene terephthalate bottles
  • plastic shrink label having an ink layer printed for displaying product information or the like may be attached to the body of a PET bottle, but the shrink label has not yet been reused. ..
  • Patent Document 1 describes a method of heat-shrinking a heat-shrinkable label under non-water immersion conditions and then removing and removing the ink layer using low-temperature alkaline water.
  • the step of immersing the shrink label provided with the ink layer capable of desorbing alkali with alkali and the step of immersing the shrink label after immersing with alkali are included in the step of immersing with water. It is possible to provide a method for removing an ink layer from a shrink label, in which the ink layer is removed from the shrink label by stirring the shrink label.
  • FIGS. 1 to (j) are diagrams illustrating an example of the flow of the method of removing the ink layer from the shrink label of the embodiment.
  • FIGS. 1 (a) to 1 (j) show an example of a flow of a method for removing an ink layer from a shrink label according to an embodiment.
  • a method of removing the ink layer from the shrink label of the embodiment will be described with reference to FIGS. 1 (a) to 1 (j).
  • the PET bottle 10 is collected in the collection box 12.
  • a shrink label 11 provided with an ink layer is attached to the body of the PET bottle 10.
  • the ink layer is a printing layer for displaying products and the like.
  • the shrink label 11 is a shrink label provided with an ink layer capable of desorbing alkali on at least one surface of a heat-shrinkable shrink film (base material).
  • the alkaline desorbable ink layer means an ink layer that is desorbed from the shrink film when it is stirred in an alkaline aqueous solution 80 (described later) at 80 ° C. to 90 ° C. at 1500 rpm for 5 minutes.
  • the ink layer on the anchor coat layer due to the alkali solubility or alkali swelling property of the anchor coat layer. May be detached from the shrink film.
  • the anchor coat layer is a layer provided between both layers in order to improve the adhesion between the shrink film and the ink layer.
  • the shrink film examples include a polyester film made of polyethylene terephthalate, polyethylene naphthalate and the like; a styrene film made of a styrene-butadiene block copolymer and the like; an olefin film made of an olefin resin such as polyethylene and polypropylene; a vinyl chloride resin.
  • a vinyl chloride-based film made of, a so-called biomass film made of polylactic acid-based resin, and the like. These may be foam films.
  • the shrink film may be a single layer, or may be a laminate of two or more layers containing the same type of shrink film or different types of shrink films.
  • the color of the shrink film is not particularly limited and may be milky white or transparent, for example.
  • the heat shrinkage rate of the shrink film in at least one direction X is preferably 30% or more, more preferably 50% or more, from the viewpoint of shrinkage adhesion to various containers and the like.
  • the thickness of the shrink film can be appropriately selected in consideration of the handleability of the shrink label 11, and can be, for example, about 10 to 100 ⁇ m, preferably about 15 to 60 ⁇ m.
  • the numerical value of these shrink films is the numerical value of the shrink film used for producing the shrink label 11 before mounting on a container such as a PET bottle 10.
  • the surface of the shrink film may be subjected to a conventionally known surface treatment.
  • the surface treatment include a corona discharge treatment for improving the adhesion to the ink layer.
  • the ink layer can be composed of, for example, either an oil-based ink or a water-based ink.
  • Examples of the method for forming the ink layer on the surface of the shrink film include gravure printing, flexographic printing, screen printing, inkjet printing and the like.
  • the thickness of the ink layer can be appropriately selected depending on the intended use and the like, and can be, for example, about 0.1 to 100 ⁇ m. Further, by using an ink having alkali solubility or alkali swelling property, an ink layer capable of desorbing alkali can be formed.
  • the anchor coat layer can be composed of a conventionally known resin composition for an anchor coat layer.
  • Examples of the method for forming the ink layer on the surface of the shrink film include a printing method similar to that for the ink layer.
  • the thickness of the anchor coat layer can be appropriately selected, and can be, for example, about 0.1 to 20 ⁇ m. Further, by using a resin composition for an anchor coat layer having alkali solubility or alkali swelling property and forming an ink layer on the resin composition, an ink layer capable of desorbing alkali can be formed.
  • the shrink label 11 is removed from the PET bottle 10 of the shrink-labeled bale 20 at the recycling factory 30, and the PET bottle 10 and the shrink label 11 are separated.
  • the object to be removed from the PET bottle 10 also includes a normal label 40 other than the shrink label 11.
  • the PET bottle 10 from which the shrink label 11 and / or the normal label 40 is separated is reused in the existing PET bottle recycling process.
  • Examples of the ordinary label 40 include a label having a non-alkali desorbing printing layer or a non-shrink label.
  • the shrink label 11 and the normal label 40 are sorted to separate and collect the shrink label 11 from the normal label 40.
  • the recovered normal label 40 is reused, for example, in a thermal recycling process.
  • the shrink label 11 provided with the ink layer is preheated.
  • the method for preheating the shrink label 11 is not particularly limited as long as it can suppress the amount of shrinkage and curling of the shrink label piece in the alkaline immersion described later, but the temperature of the preheating is the same as the temperature of the alkaline immersion or The temperature is set to be higher than the temperature of alkaline immersion. From the viewpoint of efficiently reducing the adhesion between the shrink film and the ink layer in the alkaline immersion described later, the preheating temperature is 5 ° C. higher than the alkaline immersion temperature in order to sufficiently reduce the amount of curling. It is preferably higher than that.
  • Examples of the method of preheating the shrink label 11 include a method of passing the shrink label 11 through the hot air tunnel 61 and a method of immersing the shrink label 11 in hot water 60 in the hot water tank 62.
  • the shrink label 11 is immersed in the hot water 60 in the hot water tank 62 rather than the method of passing the shrink label 11 through the hot air tunnel 61. It is preferable to use the method of causing. 1) When hot air is used, the shrink label 11 removed from the PET bottle 10 is blown off by the hot air, which makes control difficult. 2) Temperature control is easier with the method of immersing in warm water. 3) The footprint of the device is smaller in the method of immersing in warm water. 4) The method of immersing the shrink label 11 in warm water is less likely to cause uneven shrinkage of the shrink label 11, and can shrink uniformly.
  • the shrink label 11 when the shrink label 11 is preheated by immersing the shrink label 11 in the hot water 60 in the hot water tank 62, for example, the shrink label 11 is placed in warm water at about 80 ° C. to 90 ° C. for about 10 seconds to 20 seconds. It can be done by immersing.
  • the preheating temperature means the surface temperature of the shrink label 11 at the time of preheating. Therefore, when the shrink label 11 is preheated by immersing the shrink label 11 in the hot water 60 in the hot water tank 62, the temperature of the preheating can be replaced with the temperature of the hot water. Further, when the shrink label 11 is preheated by passing the shrink label 11 through the hot air tunnel 61, the temperature of the preheating can be replaced with the temperature of the hot air.
  • the shrink label 11 after preheating is crushed by a crusher 70 to prepare a shrink label piece 71.
  • the method for crushing the shrink label 11 after preheating is not particularly limited as long as the size of the shrink label piece 71 generated after the crushing is smaller than the size of the shrink label 11 after preheating.
  • the shrink label 11 after preheating can efficiently remove the ink layer from the shrink label piece 71 in the water immersion described later while sufficiently reducing the adhesion between the shrink film and the ink layer in the alkali immersion described later. It can be crushed to a size that can be removed.
  • the shrink label piece 71 is alkaline-immersed.
  • the alkaline immersion can be performed, for example, by immersing the shrink label piece 71 in an alkaline aqueous solution 80 at 65 ° C. to 90 ° C., more preferably 70 ° C. to 90 ° C. in a hot alkaline tank 82 for about 30 seconds to 20 minutes.
  • the temperature of the preheating is set to be the same as the temperature of the alkaline immersion or higher than the temperature of the alkaline immersion.
  • the alkaline immersion temperature means that it is the surface temperature of the shrink label piece 71 at the time of alkaline immersion. Therefore, the temperature of the alkaline immersion can be replaced with the temperature of the alkaline aqueous solution 80 in which the shrink label piece 71 is immersed.
  • the temperature of the alkaline immersion is preferably 65 ° C. or higher from the viewpoint of sufficiently reducing the adhesion between the shrink film and the ink layer in the alkaline immersion.
  • the upper limit of the alkaline immersion temperature is theoretically 100 ° C., more preferably the alkaline immersion temperature is 85 ° C. or higher and 95 ° C. or lower, and further preferably the alkaline immersion temperature is 80 ° C. or higher and 90 ° C. or lower. ..
  • Examples of the alkaline aqueous solution 80 include an aqueous solution of an alkali metal hydroxide such as sodium hydroxide (NaOH) or potassium hydroxide (KOH), an aqueous solution of an alkali metal carbonate such as sodium carbonate (Na 2 CO 3), and hydrogen carbonate.
  • An aqueous solution of an alkali metal hydrogen carbonate such as sodium (NaHCO 3 ), aqueous ammonia, or the like can be used.
  • the concentration of the alkaline substance in the alkaline aqueous solution 80 can be appropriately selected within a range that does not impair operability, workability, and the like.
  • the concentration of the alkaline substance in the alkaline aqueous solution 80 is, for example, about 0.1 to 10% by weight, preferably about 0.5 to 5% by weight, and more preferably about 1 to 3% by weight.
  • the alkaline aqueous solution 80 may contain other components such as a surfactant.
  • the shrink label piece 71 is not agitated in the alkaline immersion. That is, it is preferable that the alkaline aqueous solution 80 is not agitated in the alkaline immersion.
  • extremely gentle stirring that does not cause the ink layer to be detached from the shrink label piece 71 may be included in the case where the ink layer is not stirred. This efficiently separates the ink layer from the shrink film while reducing the adhesion of the alkali-soluble ink layer and / or the alkali-soluble anchor coat layer of the shrink label piece 71 to other layers. It can be suppressed.
  • the shrink label piece 71 is immersed in water.
  • the water immersion can be performed, for example, by taking out the shrink label piece 71 immersed in the alkaline aqueous solution 80 from the hot alkaline tank 82 and immersing the shrink label piece 71 in the water 90 in the water tank 91.
  • the shrink label piece 71 is stirred.
  • the shrink label piece 71 can be stirred, for example, by rotating the stirring blade 92 in the water tank 91.
  • the shrink label piece 71 may be dispersed in the water 90, and the shrink label piece 71 does not necessarily have to be submerged in the water 90.
  • the ink coating film 103 is a film in which the ink layer removed from the shrink label piece is finely divided.
  • the amount of the shrink label piece 71 in water is preferably 20 g / L or more, more preferably 40 g / L or more. When the amount of the shrink label pieces in water is 20 g / L or more, the shrink label pieces 71 can sufficiently rub against each other in water, whereby the shrink film piece 101 and the ink coating film 103 are well separated.
  • the amount of the shrink label piece 71 in water is preferably 1000 g / L or less, more preferably 500 g / L or less. In this case, the adhesion of the ink coating film 103 to the surface of the shrink film piece 101 can be suppressed.
  • the amount of the shrink label piece 71 in water is the weight (g) of the shrink label piece with respect to the total amount (L) of the water 90 in the water tank 91.
  • the temperature of the water 90 is not particularly limited, and can be, for example, normal temperature (23 ° C to 27 ° C).
  • the stirring speed is not particularly limited as long as the shrink label piece 71 in the water tank 91 is sufficiently stirred.
  • the shrink film piece 101 and the ink coating film 103 are separated. Specifically, for example, the shrink film piece 101 after the ink layer is removed from the shrink label piece is collected by the first net 100 having a relatively large opening, and the second mesh having a relatively small opening is collected. The ink coating film 103, which is smaller than the shrink film piece 101, is collected by the net 102 of the above.
  • the shrink film piece 101 collected by the first net 100 can be reused as a plastic raw material for manufacturing a plastic product such as pellets. Further, by mixing the shrink film piece 101 with the raw material of the new shrink label, it can be reused as a shrink label.
  • the ink coating film 103 collected by the second net 102 can be reused, for example, in a thermal recycling process.
  • the method for removing the ink layer from the shrink label of the embodiment is a step of immersing the shrink label provided with an ink layer capable of desorbing alkali with an alkali (alkali dipping step) and a step of immersing the shrink label piece in an alkaline solution.
  • the ink layer is removed from the shrink label by stirring the shrink label in the step of immersing in water (immersion / stirring step in water) and the step of immersing in water.
  • the hot alkaline bath may be contaminated with ink. be.
  • the action of reducing the adhesion between the ink layer and the shrink film may be insufficient, and there is a concern that it will be difficult to reuse the alkaline solution.
  • the concentration work for reducing the amount of waste is dangerous.
  • precise control of the stirring speed is required to prevent the alkaline solution from scattering.
  • the adhesion between the ink layer capable of desorbing alkali and the shrink film is sufficiently lowered by the alkali dipping step, and the shrink film is obtained by the subsequent water dipping / stirring step.
  • the ink layer can be removed from the shrink label more efficiently than before.
  • the removing method of the embodiment can further include a step of preheating the shrink label (preheating step) and a step of crushing the preheated shrink label (crushing step) before the alkaline immersion step. ..
  • the removal method of the embodiment can further efficiently remove the ink layer from the shrink label by further including a preheating step and a pulverization step.
  • the shrink label is crushed into a shrink label piece prior to the alkali immersion.
  • the ink layer can be efficiently removed from the shrink label by crushing the shrink label to form smaller shrink label pieces, which are then immersed in alkali and water.
  • the shrink label piece that has not been preheated when immersed in an alkali, the shrink label piece wraps around in an alkaline aqueous solution and shrinks while curling. It is very difficult to remove the ink layer from the shrink label pieces, which are curled pieces.
  • the shrink label attached to the PET bottle or the like is heat-shrinked once at the time of attachment, but the shrinkage ability still remains in the shrink label. Therefore, when the temperature of the alkaline aqueous solution at the time of alkali immersion is high, the shrink label piece is further heat-shrinked. On the other hand, when the temperature of the alkaline aqueous solution is low, the ink layer cannot be efficiently removed from the shrink label piece.
  • the shrink label before the shrink label is crushed into a shrink label piece, the shrink label is preheated at a temperature equal to or higher than the temperature of the alkaline immersion to be heat-shrinked in advance. Then, the shape of the shrink label can be made into a wavy shape with a small degree of curl, for example. If the shrink label is preheated after the shrink label is crushed, the shrink label piece will be curled (rolled up) as a whole, which is not suitable for removing the ink layer.
  • shrink label pieces obtained by crushing shrink labels with a small degree of curl also have a small degree of curl.
  • most of the shrink labels 11 removed from a container such as a PET bottle 10 have a side of 10 cm or more, and after the shrink labels 11 having such a size are heat-shrinked by preheating, they are several cm square.
  • the efficiency of removing the ink layer can be remarkably improved, preferably 5 cm square or less.
  • the shrink label 11 suitable for the method of the present embodiment has a shrinkage rate measured in the radial direction (main shrinkage direction) of the container after being removed from a container such as a PET bottle 10 and immersed in a warm bath at 95 ° C. for 10 seconds.
  • a shrink label of 30% or more, preferably 40% or more, more preferably 50% or more can be mentioned.
  • a tubular shrink film having a thickness of 20 ⁇ m, a height (width) of 15 cm, and a circumference of 24 cm was prepared using the original fabric of a PET-based shrink film having a thickness of 20 ⁇ m.
  • An ink layer having a thickness of 2 ⁇ m was provided on the surface of the tubular shrink film to prepare a shrink label.
  • An alkali-soluble ink manufactured by Dainichiseika Kogyo Co., Ltd., product name "CycleFine
  • a PET bottle with a shrink label was produced by shrinking the shrink label in a state where the shrink label was attached to a tubular PET bottle having an outer diameter of 54 mm.
  • the shrinkage rate of the shrink label at this time was about 30%, and the area of the shrink label after mounting was about 70% of the area of the shrink label before mounting. Then, the shrink label was peeled off from the PET bottle.
  • the shrink label peeled off from the PET bottle while gently stirring the warm water was immersed in warm water at 80 ° C. for 20 seconds for preheating.
  • the area of the shrink label became about 50% of the area of the shrink label before preheating (the area of the shrink label after mounting).
  • the shrink label after preheating was crushed to prepare a substantially square shrink label piece having a length of 40 mm and a width of 40 mm.
  • Example 2 In Experimental Example 2, the same method as in Example 1 was carried out except that a 2 kg shrink label piece was used. Also in Example 2, when the weight% of the film A with respect to the total of the weight of the film A and the weight of the film B was calculated, the value was 93%. The ink layer removed from the shrink film was present as a coating film in water, while the coating film was not present in the NaOH aqueous solution.

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  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
PCT/JP2021/015823 2020-05-08 2021-04-19 シュリンクラベルからのインキ層の除去方法 Ceased WO2021225070A1 (ja)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7392210B1 (ja) * 2022-09-06 2023-12-05 Dic株式会社 プラスチックフィルムの分離回収方法、及び再生プラスチックペレットの製造方法
WO2024053245A1 (ja) * 2022-09-06 2024-03-14 Dic株式会社 プラスチックフィルムの分離回収方法、及び再生プラスチックペレットの製造方法
JP2024066537A (ja) * 2022-11-02 2024-05-16 ａｒｔｉｅｎｃｅ株式会社 プラスチック基材の分離回収方法
WO2025028276A1 (ja) * 2023-08-01 2025-02-06 Dic株式会社 プラスチックフィルムの分離回収方法、及び再生プラスチックペレットの製造方法

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JP2001034937A (ja) * 1999-07-19 2001-02-09 Kyodo Printing Co Ltd 磁気記録媒体からの磁気記録層の剥離方法
JP2001261746A (ja) * 2000-03-15 2001-09-26 Dainichiseika Color & Chem Mfg Co Ltd 潜在的親水性樹脂及び該樹脂を含む組成物
JP2001350411A (ja) * 2000-06-05 2001-12-21 Fuji Seal Inc 熱収縮性ラベルからのインキ層の除去方法
JP2002327088A (ja) * 2001-05-07 2002-11-15 Akio Kobayashi 精製熱可塑性ポリエステル樹脂の製造法
JP2003122256A (ja) * 2002-06-17 2003-04-25 Toyobo Co Ltd ラベルを装着したボトル及びその再生方法
US20030186159A1 (en) * 2002-03-28 2003-10-02 Schwartz John A. Composition and process for recovering coated polyester materials
JP2005001287A (ja) * 2003-06-13 2005-01-06 Nippon Airitsuhi Kk 使用済み合成樹脂の再生装置およびその方法

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001034937A (ja) * 1999-07-19 2001-02-09 Kyodo Printing Co Ltd 磁気記録媒体からの磁気記録層の剥離方法
JP2001261746A (ja) * 2000-03-15 2001-09-26 Dainichiseika Color & Chem Mfg Co Ltd 潜在的親水性樹脂及び該樹脂を含む組成物
JP2001350411A (ja) * 2000-06-05 2001-12-21 Fuji Seal Inc 熱収縮性ラベルからのインキ層の除去方法
JP2002327088A (ja) * 2001-05-07 2002-11-15 Akio Kobayashi 精製熱可塑性ポリエステル樹脂の製造法
US20030186159A1 (en) * 2002-03-28 2003-10-02 Schwartz John A. Composition and process for recovering coated polyester materials
JP2003122256A (ja) * 2002-06-17 2003-04-25 Toyobo Co Ltd ラベルを装着したボトル及びその再生方法
JP2005001287A (ja) * 2003-06-13 2005-01-06 Nippon Airitsuhi Kk 使用済み合成樹脂の再生装置およびその方法

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7392210B1 (ja) * 2022-09-06 2023-12-05 Dic株式会社 プラスチックフィルムの分離回収方法、及び再生プラスチックペレットの製造方法
WO2024053245A1 (ja) * 2022-09-06 2024-03-14 Dic株式会社 プラスチックフィルムの分離回収方法、及び再生プラスチックペレットの製造方法
JP2024066537A (ja) * 2022-11-02 2024-05-16 ａｒｔｉｅｎｃｅ株式会社 プラスチック基材の分離回収方法
JP7679343B2 (ja) 2022-11-02 2025-05-19 ａｒｔｉｅｎｃｅ株式会社 プラスチック基材の分離回収方法
WO2025028276A1 (ja) * 2023-08-01 2025-02-06 Dic株式会社 プラスチックフィルムの分離回収方法、及び再生プラスチックペレットの製造方法
JP7666768B1 (ja) * 2023-08-01 2025-04-22 Dic株式会社 プラスチックフィルムの分離回収方法、及び再生プラスチックペレットの製造方法

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