WO2023189670A1 - Procédé d'élimination de couche de revêtement et dispositif d'élimination de couche de revêtement - Google Patents

Procédé d'élimination de couche de revêtement et dispositif d'élimination de couche de revêtement Download PDF

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Publication number
WO2023189670A1
WO2023189670A1 PCT/JP2023/010390 JP2023010390W WO2023189670A1 WO 2023189670 A1 WO2023189670 A1 WO 2023189670A1 JP 2023010390 W JP2023010390 W JP 2023010390W WO 2023189670 A1 WO2023189670 A1 WO 2023189670A1
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Prior art keywords
coating layer
base film
stirring tank
laminated film
film
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PCT/JP2023/010390
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English (en)
Japanese (ja)
Inventor
裕一 森
知巳 深谷
太寿 西尾
毅朗 吉延
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リンテック株式会社
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Publication of WO2023189670A1 publication Critical patent/WO2023189670A1/fr

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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D7/00—Producing flat articles, e.g. films or sheets
    • B29D7/01—Films or sheets

Definitions

  • the present invention relates to a coating layer removal method and a coating layer removal device.
  • Patent Document 1 a resin base material having a coating on its surface is placed in a cleaning container, and the resin base material is mixed with an alkaline aqueous solution in an amount that makes the liquid level higher than the top of the resin base material deposited in the cleaning container.
  • a method for removing a resin substrate coating is disclosed, which includes a coating removal step of stirring at a temperature of 80 to 180° C. at a rotation speed of 2 to 100 m/sec at the tip of a stirring blade.
  • Patent Document 2 discloses a release film in which a release layer is formed on at least one side of a base film through an easily soluble resin layer, and the release film after use is made of an easily soluble resin.
  • a release film characterized in that the release layer on the surface of the film is separated and removed by immersing it in a solvent that can dissolve the easily soluble resin in the solvent, and only the base film is recovered.
  • a collection method is disclosed.
  • the method described in Patent Document 1 is a technique for removing a film on a resin base material using an alkaline aqueous solution.
  • the alkaline aqueous solution after use contains components in the film (for example, a stripping agent), and there is a problem in that the cleaning ability decreases when reused. Another problem is that it takes time and effort to purify the alkaline aqueous solution.
  • a release layer is laminated on at least one side of a base film with an easily soluble resin layer (water-soluble resin or water-dispersible resin) interposed therebetween.
  • the release layer is peeled from the release film by utilizing the property that the easily soluble resin layer is easily dissolved in a solvent.
  • the layer configuration of laminated films is diverse, for example, when the layer formed on the base film is a water-insoluble resin layer, in the method described in Patent Document 2, from the release film to the release layer. is difficult to remove. Furthermore, in the method described in Patent Document 2, there is a possibility that the easily soluble resin layer dissolved in the solvent will re-adhere to the release film. Furthermore, there is a possibility that the solvent may be contaminated by the easily soluble resin layer. In recent years, in the case of laminated films, there is a need for a technique that can easily remove a film (coating layer) consisting of multiple layers laminated on a base film. Furthermore, it is desired that the solvent used be one that is easy to reuse.
  • An object of the present invention is to provide a coating layer removal method and a coating layer removal device that can easily remove the coating layer from a laminated film having a base film and a coating layer.
  • the coating layer includes an intermediate layer and a release agent layer, the intermediate layer is disposed between the base film and the release agent layer, How to remove coating layer.
  • the step of cutting the laminated film into strips includes cutting the laminated film unwound from a roll around which the laminated film is wound into strips.
  • the step of separating the laminated film into the base film and the coating layer includes submerging the separated base film in the warm water and floating the separated coating layer residue in the warm water. , The method for removing a coating layer according to [1] or [2] above.
  • the coating layer recovery step is a step of filtering the residue of the coating layer floating in the warm water using a filter removably installed just below the water surface of the stirring tank.
  • the method for removing a coating layer according to any one of [1] to [3] above.
  • the coating layer recovery step the warm water in the stirring tank is overflowed, and the residue of the coating layer flowing out due to the overflow of the hot water is discharged from the upper discharge port of the stirring tank to the outside of the stirring tank. It is a process of guiding and recovering.
  • the method for removing a coating layer according to any one of [1] to [3] above.
  • the coating layer recovery step includes, when overflowing the hot water in the stirring tank, using a scraping member to scrape up debris of the coating layer floating near the surface of the hot water in the stirring tank. a step of guiding and collecting the residue of the coating layer to the upper discharge port, The method for removing a coating layer according to [5] above.
  • the overflow is performed using a water injection means equipped with a discharge port, the discharge port is provided in the stirring tank;
  • the base film recovery step includes: The base film submerged in the warm water is recovered through an outlet disposed at the bottom side of the stirring tank, or the base film submerged in the warm water is connected to the bottom side of the stirring tank. Collected through the discharge pipe, The method for removing a coating layer according to any one of [3] to [7] above.
  • the intermediate layer is hydrophilic and water-insoluble.
  • the laminated film is used for manufacturing a ceramic green sheet, and is a laminated film after the ceramic green sheet is peeled off.
  • the method for removing a coating layer according to any one of [1] to [11] above.
  • a coating layer removal device for removing the coating layer from a laminated film having a base film and a coating layer, a cutting means for cutting the laminated film into strips; a stirring means including a stirring tank that separates the cut laminated film into the base film and the coating layer by immersing and stirring the cut laminated film in hot water; a coating layer recovery means for recovering the coating layer residue separated from the laminated film from the upper side of the stirring tank; a base film recovery means for recovering the base film separated from the laminated film from the bottom side of the stirring tank; Coating layer removal equipment.
  • the coating layer recovery means is a filter removably installed just below the water surface of the stirring tank.
  • the coating layer recovery means is a scraping member that guides debris of the coating layer flowing out due to overflow of the hot water in the stirring tank to the outside of the stirring tank.
  • the coating layer removal device according to [13] above.
  • the base film recovery means is an outlet disposed on the bottom side of the stirring tank or a discharge pipe connected to the bottom side of the stirring tank.
  • the coating layer removal device according to any one of [13] to [15].
  • the laminated film is used for manufacturing a ceramic green sheet, and is a laminated film after the ceramic green sheet is peeled off.
  • the coating layer removal device according to any one of [13] to [16].
  • a coating layer removal method and a coating layer removal device that can easily remove the coating layer from the laminated film.
  • FIG. 7 is a schematic diagram of an example of a coating layer recovery means according to a third embodiment.
  • FIG. 7 is a schematic diagram of an example of a coating layer recovery means according to a third embodiment.
  • FIG. 7 is a schematic diagram of an example of a coating layer recovery means according to the fourth embodiment.
  • FIG. 7 is a schematic diagram of an example of a coating layer recovery means according to the fourth embodiment.
  • FIG. 7 is a cross-sectional view of an example of a collection structure for collecting dregs of the base film and coating layer according to the fifth embodiment.
  • FIG. 5B is a top view of the recovery structure shown in FIG. 5A.
  • the coating layer removal method according to the present embodiment includes a step of cutting a laminated film having a base film and a coating layer into strips (hereinafter also referred to as a cutting step).
  • a process of separating the laminated film into the base film and the coating layer by immersing and stirring the cut laminated film in warm water in a stirring tank (hereinafter also referred to as separation process) ), a base film recovery step of recovering the separated base film, and a coating layer recovery step of recovering the separated coating layer dregs.
  • the coating layer includes an intermediate layer and a release agent layer, and the intermediate layer is disposed between the base film and the release agent layer.
  • the laminated film is cut into small pieces and the cut laminated film is stirred in hot water, thereby increasing the infiltration area of the hot water into the coating layer.
  • Warm water easily infiltrates the interface with the As a result, the intermediate layer is easily peeled off from the base film together with the release agent layer, and the coating layer can be easily removed from the laminated film.
  • the removal method according to the present embodiment uses warm water, so the coating layer can be removed from the laminated film regardless of the chemical properties of the coating layer. Therefore, the removal method according to this embodiment is a new coating layer removal method for recovering and recycling the base film (preferably PET film).
  • the removal method according to the present embodiment does not leave any foreign matter (mainly blasting material) behind, compared to a method in which the coating layer is removed by blasting. Further, the removal method according to the present embodiment can be carried out using a removal device having a compact structure (for example, FIG. 2, etc.) before and after removing the coating layer, so when storing the removal device, , the cost can be reduced when transporting.
  • a removal device having a compact structure for example, FIG. 2, etc.
  • FIG. 1 is an example of a cross-sectional view of a laminated film 50 used in the removal method according to the present embodiment.
  • the laminated film 50 is a laminated film that has been cut into pieces after being subjected to a cutting process.
  • Laminated film 50 has a base film 51 and a coating layer 52.
  • the coating layer 52 includes an intermediate layer 521 and a release agent layer 522, and the intermediate layer 521 is disposed between the base film 51 and the release agent layer 522. That is, in the laminated film 50, a base film 51, an intermediate layer 521, and a release agent layer 522 are laminated in this order.
  • FIG. 1 is an example of a cross-sectional view of a laminated film 50 used in the removal method according to the present embodiment.
  • the laminated film 50 is a laminated film that has been cut into pieces after being subjected to a cutting process.
  • Laminated film 50 has a base film 51 and a coating layer 52.
  • the coating layer 52 includes an
  • a indicates the surface of the intermediate layer 521 on the base film side
  • b indicates the surface of the intermediate layer 521 on the release agent layer side
  • d indicates the surface of the release agent layer
  • c indicates the surface of the release agent layer 522 on the intermediate layer side.
  • the base film and the intermediate layer are in direct contact with each other.
  • the base film 51 and the intermediate layer 521 are in direct contact
  • the intermediate layer 521 and the release agent layer 522 are in direct contact.
  • the intermediate layer is preferably hydrophilic and water-insoluble.
  • the effect of this embodiment (the effect that the coating layer can be easily removed from the laminated film) is more effectively achieved.
  • the reason for this is thought to be as follows.
  • the intermediate layer 521 in the laminated film 50 is in close contact with the base film 51 mainly due to hydrogen bonds and anchor effects (FIG. 1). If the intermediate layer 521 is hydrophilic, when the laminated film 50 cut into pieces is stirred with warm water in the stirring tank, the warm water will more likely infiltrate into the interface between the base film 51 and the intermediate layer 521.
  • the hydrogen bonding and anchoring effect between the intermediate layer 521 and the base film 51 are weakened. As a result, the intermediate layer 521 is more easily peeled off from the base film 51 together with the release agent layer 522, and the coating layer 52 can be more easily removed from the laminated film 50.
  • the intermediate layer is water-insoluble, components of the intermediate layer 521 are prevented from eluting into hot water. Therefore, since the intermediate layer 521 is water-insoluble, it is possible to prevent hot water from being contaminated, and it becomes easier to reuse the hot water after use. As described above, since the intermediate layer is hydrophilic and water-insoluble, the coating layer can be more easily removed from the laminated film, and hot water can be easily reused.
  • an intermediate layer is “hydrophilic” if the contact angle of water on the surface of the intermediate layer on the base film side is 55 degrees or less. do.
  • the contact angle is preferably 50 degrees or less, more preferably 45 degrees or less.
  • the contact angle is determined when the base film of the intermediate layer is contacted after the base film is separated from the laminated film, that is, after the intermediate layer is brought into contact with water and the interface between the intermediate layer and the base film is peeled off. This value is obtained by measuring the contact angle of water on the surface (peeled surface).
  • the intermediate layer is separated from the base film and the contact angle of water on the surface of the intermediate layer on the base film side is measured by the following method. The obtained value is taken as the contact angle of water on the surface of the intermediate layer on the base film side.
  • Adhesive tape with a width of 50 mm (manufactured by Nitto Denko Corporation, product name "Polyester Adhesive Tape No. 31B") was pasted on the surface of the release agent layer of the laminated film, and then cut into a size of 50 mm x 50 mm to form a test piece. Create. Next, a glass beaker with a capacity of 500 mL is filled with 300 mL of warm water, and the entire test piece is immersed in 90° C.
  • test piece was separated into a laminate in which the release agent layer and the intermediate layer were integrally supported on the adhesive tape, and a base film, and the release agent layer and the intermediate layer were supported.
  • the contact angle is measured on the surface of the intermediate layer supported on the adhesive tape (the surface of the intermediate layer that was in contact with the surface of the base film).
  • the contact angle is measured by the sessile drop method using a contact angle meter (manufactured by Kyowa Interface Science Co., Ltd., product name "DM-701") according to JIS R3257:1999.
  • DM-701 contact angle meter
  • whether or not the intermediate layer is "water-insoluble” is determined by the contact angle of water on the release agent layer surface (symbol d in FIG. 1) measured using the following method and the intermediate layer. If the difference between the water contact angle on the base film side surface (in FIG. 1, reference numeral a) is 30 degrees or more, the intermediate layer is determined to be water-insoluble. The difference in contact angle is preferably 40 degrees or more, more preferably 50 degrees or more. If the value of this difference is small, it means that the components constituting the intermediate layer were eluted into water and the partially exposed release agent layer was measured.
  • the contact angle of water on the surface of the release agent layer is not particularly limited, but is usually 80 degrees or more, preferably 85 degrees or more, and more preferably 90 degrees or more. Further, the upper limit of the contact angle of water on the surface of the release agent layer is usually 150 degrees, preferably 140 degrees, and more preferably 130 degrees.
  • the contact angle of water on the surface of the release agent layer is measured by the sessile drop method using a contact angle meter (manufactured by Kyowa Kaimen Kagaku Co., Ltd., product name "DM-701") according to JIS R3257:1999. For droplets, use distilled water.
  • the removal method according to the present embodiment can be carried out using, for example, the coating layer removal apparatus according to the second embodiment (hereinafter also referred to as the removal apparatus according to the second embodiment).
  • FIG. 2 is a schematic diagram of an example of the removal device 100 according to the second embodiment.
  • the removal device 100 is a coating layer removal device 100 for removing a coating layer from a laminated film having a base film and a coating layer, and includes a cutting means 10 for cutting the laminated film into strips, and a cutting device 10 for cutting the laminated film into strips; 50 is immersed in hot water HW and stirred to separate the laminated film 50 into the base film 51 and the coating layer.
  • the coating layer collecting means 30 collects the base film 51 separated from the laminated film 50 from the bottom side of the stirring tank 21C.
  • FIG. 2 shows a roll 1 wound with a laminated film before cutting, a pair of nip rolls 11, a pair of cutter blades 12, and a fragment collector 13.
  • the cutting means 10 is a means for cutting the laminated film into strips.
  • Examples of the cutting means include a cutting machine equipped with a cutter.
  • Examples of the cutter include a cutter blade, water jet cutter, laser cutter, and ultrasonic cutter.
  • the cutting means 10 includes a pair of nip rolls 11 and a pair of cutter blades 12.
  • the stirring means 20 is a means for separating the cut laminated film 50 into a base film 51 and a coating layer by immersing and stirring the cut laminated film 50 in hot water HW.
  • the stirring means 20 includes a stirring tank 21C that stores hot water HW.
  • the stirring tank 21C includes a stirring shaft 22 having stirring blades 22A.
  • the stirring shaft 22 is connected to a motor (not shown).
  • the base film collecting means 40 is a means for collecting the base film 51 separated from the laminated film 50 from the bottom side of the stirring tank 21C.
  • the base film recovery means includes a discharge port disposed at the bottom of the stirring tank (hereinafter also referred to as base film discharge port) or a discharge pipe connected to the bottom side of the stirring tank (hereinafter also referred to as base film discharge pipe). ) is preferable.
  • the base film recovery means 40 is a base film discharge port 44 arranged at the bottom of the stirring tank 21C.
  • the base film outlet 44 can be opened and closed, or can be removed.
  • the coating layer recovery means 30 is a means for recovering the coating layer residue 52C separated from the laminated film 50 from the upper opening 21B (an example of an upper discharge port) of the stirring tank 21C.
  • the coating layer recovery means include a tray having a mesh structure (for example, a colander, etc.), a filter, a scraping member (for example, a scraping plate and a scraping blade, etc.), a container, a pump, and at least one of these. Examples include structures that include. It is preferable that the container has a structure in which at least a portion thereof is mesh-like or a structure provided with a filter. In the case of FIG. 2, the coating layer collecting means 30 is a tray 30a having a mesh structure.
  • the removal method according to the first embodiment is performed, for example, through the following steps.
  • the cutting step is a step of cutting a laminated film having a base film and a coating layer into strips. It is preferable that the cutting step is a step of cutting the laminated film unwound from the roll on which the laminated film is wound into strips.
  • the laminated film fed out from the roll 1 passes between a pair of nip rolls 11, and then is cut into strips by a pair of cutter blades 12.
  • the cut laminated film 50 is collected by a fragment collector 13.
  • the dimension of one side of the laminated film 50 is preferably 15 cm or less, more preferably 10 cm or less, and still more preferably 5 cm or less.
  • the lower limit of the dimension of one side of the laminated film is preferably 5 mm or more.
  • the pieces of the ceramic green sheet may be removed from the coating layer in the separation process after the cutting process. It may peel off and sink into hot water, making it difficult to collect the base film alone.
  • a filter may be placed at the bottom of the stirring tank to separate the base film from the ceramic green sheet fragments.
  • the laminated film before being cut does not need to be wound into a roll.
  • the cutting step may be a step of cutting the prepared laminated film of any size into strips.
  • the laminated film is preferably used for manufacturing a ceramic green sheet, and is a laminated film after the ceramic green sheet has been peeled off.
  • the separation process is a process of separating the cut laminated film 50 into the base film 51 and the coating layer by immersing and stirring the cut laminated film 50 in hot water HW in the stirring tank 21C.
  • the separation step is performed after the laminated film 50 collected by the fragment collector 13 is introduced into the stirring tank 21C.
  • the separation step is preferably a step in which the separated base film is submerged in hot water and the separated coating layer residue is floated in the hot water.
  • the temperature of the hot water HW is, for example, preferably 40°C or higher, more preferably 60°C or higher. Further, the temperature of the hot water HW is preferably less than 100°C, more preferably 98°C or less.
  • the immersion time of the laminated film 50 in hot water HW may be, for example, 5 minutes or more and 120 minutes or less, 10 minutes or more and 100 minutes or less, or 15 minutes or more and 60 minutes or less.
  • the stirring time is preferably in the same range as the immersion time of the laminated film 50 in the hot water HW. That is, the stirring time may be, for example, 5 minutes or more and 120 minutes or less, 10 minutes or more and 100 minutes or less, or 15 minutes or more and 60 minutes or less.
  • the rotation speed of the stirring blade 22A may be, for example, 10 rpm or more and 1000 rpm or less, 15 rpm or more and 750 rpm or less, or 20 rpm or more and 500 rpm or less.
  • the base film recovery process is a process of recovering the separated base film 51.
  • the base film recovery step collects the base film 51 submerged in HW in hot water from the base film outlet 44 (an example of base film recovery means) disposed at the bottom side of the stirring tank 21C. This is the process of Since the base film 51 easily sinks in hot water HW, the base film 51 can be easily removed from the base film discharge port 44 by opening the base film discharge port 44 or removing the base film discharge port 44. It can be recovered. Water droplets are removed from the recovered base film 51 by a known method.
  • the coating layer recovery process is a process of recovering the separated coating layer dregs 52C.
  • the coating layer recovery step involves scooping up coating layer debris 52C floating on the surface of the hot water from the upper opening 21B (an example of an upper discharge port) of the stirring tank 21C using a tray 30a having a mesh structure. This is the process of recovering the waste.
  • the hot water HW in the stirring tank 21C may overflow, and the coating layer residue 52C flowing out due to the overflow of the hot water HW may be recovered using the coating layer recovery means 30 described above.
  • the coating layer recovery process may be performed after the base film recovery process, the base film recovery process may be performed after the coating layer recovery process, and the base film recovery process may be performed after the base film recovery process. You may perform a collection
  • the removing device according to the third embodiment is different from the removing device 100 according to the second embodiment in that the stirring means and the coating layer collecting means are changed to a stirring means 20A and a coating layer collecting means 30A shown in FIGS. 3A and 3B, respectively.
  • This embodiment is the same as the second embodiment except for the above.
  • differences from the second embodiment will be mainly explained, and explanations of similar items will be omitted or simplified by giving the same reference numerals.
  • 3A and 3B are schematic diagrams of an example of a coating layer recovery means according to the third embodiment, and are diagrams for explaining a coating layer recovery process.
  • the stirring means 20A includes a stirring tank 21 having a notch 210 at the top.
  • the stirring tank 21 includes a stirring shaft 22 having stirring blades 22B.
  • the coating layer collection means 30A includes a container 31 that collects coating layer debris 52C floating on the water surface from the notch 210 of the stirring tank 21.
  • the stirring means 20A shown in FIG. 3B controls the rotation speed of the stirring blade 22B so that as the stirring blade 22B rotates, the water surface becomes approximately triangular and the outer peripheral part of the water surface is higher than the bottom of the notch 210. do.
  • the removal method according to the first embodiment is carried out in the same manner as the second embodiment except for the following steps.
  • FIGS. 4A and 4B are schematic diagrams of an example of a coating layer recovery means according to the fourth embodiment, and are diagrams for explaining a coating layer recovery process.
  • the coating layer collection means 30B includes a container 31 for collecting coating layer debris 52C floating on the upper surface of the hot water HW from the cutout 210, and a water injection means 33 having a discharge port 33a.
  • the water injection means 33 is a means for overflowing the hot water HW.
  • a hose is shown as the water injection means 33 in FIGS. 4A and 4B.
  • the water injection means 33 injects water or hot water into the stirring tank 21 from the discharge port 33a, and removes the coating layer dregs 52C floating on the top surface of the hot water HW from the notch 210 into a container installed outside the stirring tank 21. Guide to 31.
  • the means for overflowing is not particularly limited.
  • the water injection means 33 only needs to have a structure that can inject water or hot water.
  • the discharge port of the water injection means may be provided within the stirring tank 21 or may be provided outside the stirring tank 21. It is preferable that the overflow is performed using a water injection means provided with a discharge port, and that the discharge port is provided in the stirring tank.
  • the removal method according to the first embodiment is carried out in the same manner as in the third embodiment except for the following steps.
  • the hot water HW in the stirring tank 21 overflows, and the coating layer dregs 52C flowing out due to the overflow of the hot water HW is removed from the notch 210 (upper discharge port) of the stirring tank 21.
  • the hot water HW in the stirring tank 21 is caused to overflow by injecting the hot water HW into the stirring tank 21 from the discharge port 33a of the water injection means 33. Due to this overflow, the coating layer dregs 52C are guided into the container 31 from the notch 210 of the stirring tank 21 and collected.
  • FIG. 5A is a cross-sectional view of an example of a collection structure for collecting dregs of the base film and coating layer according to the fifth embodiment.
  • FIG. 5B is a top view of the collection structure shown in FIG. 5A.
  • FIG. 5A and FIG. 5B are diagrams for explaining the base film recovery process and the coating layer recovery process.
  • the collection structure 300 includes a base film collection means 40A and a coating layer collection means 30C.
  • the base film recovery means 40A is a base film discharge pipe 41 connected to the bottom side of the stirring tank 21A.
  • the coating layer recovery means 30C is a scraping blade 34 (an example of a scraping member) that guides the coating layer debris flowing out due to the overflow of the hot water HW in the stirring tank 21A to the outside of the stirring tank 21A.
  • the recovery structure 300 will be explained.
  • the recovery structure 300 includes a stirring tank 21A having a stirring shaft 22, a scraping blade 34 provided at the top of the stirring tank 21A and rotating around the stirring shaft 22, and a scraping blade 34 provided along the upper outer periphery of the stirring tank 21A. and a cylindrical support member 43.
  • the stirring shaft 22 has stirring blades 22A.
  • the scraping blade 34 has a tapered part 34b, and a slit 34a is formed on the opposite side of the tapered part 34b. When the scraping blade 34 rotates in the stirring tank 21A, a centrifugal force is generated, and the water level is lower inside the stirring tank 21A and higher outside the stirring tank 21A.
  • the scraping blade 34 has a substantially triangular shape along the water surface.
  • the scraping blade 34 extends from the vicinity of the stirring shaft 22 through the slit 34a to the support wall 43B of the support member 43, and is formed so as to slide and rotate on the upper outer periphery of the stirring tank 21A through the slit 34a. .
  • the scraping blade 34 is connected to a motor (not shown).
  • the support member 43 has an inclined bottom plate 43A for guiding the coating layer dregs to the dregs discharge port 35, and a support wall 43B.
  • An opening 42 is provided in the inclined bottom plate 43A (FIG. 5B), and a waste discharge port 35 is provided at the bottom of the opening 42.
  • the bottom surface of the stirring tank 21A is inclined and connected to a base film discharge pipe 41 for discharging the base film.
  • the waste discharge port 35 and the base film discharge pipe 41 are inclined in the same direction as the bottom surface of the stirring tank 21A.
  • the removal method according to the first embodiment is carried out in the same manner as the second embodiment except for the following steps.
  • the coating layer recovery step includes scraping up the coating layer dregs floating near the surface of the hot water in the stirring tank 21A using the scraping blade 34 when the hot water HW in the stirring tank 21A overflows.
  • This is a step in which the dregs of the coating layer are guided to the dregs discharge port 35 (an example of an upper discharge port) and collected.
  • the scraping blade 34 rotates around the stirring shaft 22
  • coating layer dregs floating near the surface of the hot water HW are guided to the inclined bottom plate 43A. Thereafter, the coating layer dregs are guided to the dregs discharge port 35 through the opening 42 provided in the inclined bottom plate 43A and collected.
  • the base film recovery step includes a base film discharge pipe 41 (an example of base film recovery means 40A) that connects the base film submerged in hot water to the bottom side of the stirring tank 21A.
  • a base film discharge pipe 41 an example of base film recovery means 40A
  • the base film is guided to the bottom surface of the stirring tank 21A, and then the base film discharge pipe 41 (of the base film recovery means 40A) connected to the bottom surface along the inclined bottom surface example) and are collected. Water droplets are removed from the recovered base film by a known method.
  • the coating layer recovery step is a step of filtering the coating layer dregs floating on the hot water using a filter removably provided just below the water surface of the stirring tank.
  • the coating layer recovery means is a filter removably provided just below the water surface of the stirring tank.
  • the recovery structure 300 in the fifth embodiment may include a removable filter directly below the water surface of the stirring tank 21A (for example, the opening 42 and the waste discharge port 35). In the cutting process of the second to fifth embodiments, after the cut laminated film 50 is collected by the fragment collector 13, the collected laminated film 50 is introduced into the stirring tank, but the invention is not limited to this. .
  • the cut laminated film 50 may be directly introduced into the stirring tank without passing through the fragment collector 13. That is, the cutting step and the separating step may be performed continuously.
  • the removal device includes a water injection means for injecting water into the stirring tank again after filtering hot water discharged from the base film drain port or base film discharge pipe of the stirring tank. May have.
  • the stirring tank may include a heating means for adjusting the hot water to a predetermined temperature.
  • the heating means may be provided inside the stirring tank or may be provided outside the stirring tank. A known heater can be used as the heating means.
  • the removal method according to the first embodiment may further include the step of discharging hot water from the stirring tank and filtering it with a filter, and then pouring water into the stirring tank again.
  • the invention is not limited to the embodiments described above.
  • the present invention may include modifications, improvements, etc. within the scope that can achieve the objects of the present invention.
  • the laminated film used in any of the embodiments described above includes a base film and a coating layer.
  • the coating layer includes an intermediate layer and a release agent layer.
  • the intermediate layer is arranged between the base film and the release agent layer.
  • the intermediate layer may be a single layer, or may be a multilayer consisting of two or more intermediate layers of the same or different types.
  • the release agent layer may be a single layer, or may be a multilayer consisting of two or more release agent layers of the same or different types.
  • the laminated film preferably has a structure in which the base film and the intermediate layer are directly laminated, from the viewpoint of removing the coating layer from the laminated film and making it easy to recover the remaining base film.
  • direct lamination refers to a configuration in which, for example, there is no other layer between the base film and the intermediate layer, and the layers are in direct contact with each other.
  • the base film, the intermediate layer, and the release agent layer may be directly laminated in this order. That is, the structure may be such that there is no other layer between the base film, the intermediate layer, and the release agent layer, and the layers are in direct contact with each other.
  • a resin film is used in which a resin component that is scheduled to be collected is formed into a film.
  • resin films include polyester films such as polyethylene terephthalate film, polybutylene terephthalate, and polyethylene naphthalate; polyolefin films such as polyethylene film and polypropylene film; polyimide film; polyamide film; polycarbonate film; polyacetate film; ethylene-vinyl acetate copolymer.
  • Ethylene-(meth)acrylic acid copolymer film ethylene-(meth)acrylic acid ester copolymer film; cycloolefin polymer film; polyurethane film; polyphenylene sulfide film; cellophane; etc. can be used.
  • the density of the base film is preferably greater than the density of water at 40° C., and more preferably 1.0 g/cm 3 or more. This makes it easier for the base film separated from the laminated film to sink into the warm water, so the base film can be easily recovered from the bottom side of the stirring tank.
  • polyester films are preferred because they have a density higher than that of water at 40°C and excellent heat resistance and strength.
  • the polyester film from the viewpoint of easy recovery and recycling of the resin, a polyester film containing any one of polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate as a main component is preferable.
  • the resin film may contain known fillers, colorants, antistatic agents, antioxidants, organic lubricants, catalysts, and the like.
  • the resin film may be transparent or may be colored as desired.
  • at least one surface of the base film may be subjected to surface treatment such as sputtering, corona discharge, flame, ultraviolet irradiation, electron beam irradiation, and etching treatment such as oxidation, as necessary.
  • the thickness of the base film is not particularly limited, but from the viewpoint of strength and rigidity, it is preferably 10 ⁇ m or more and 500 ⁇ m or less, more preferably 15 ⁇ m or more and 300 ⁇ m or less, and even more preferably 20 ⁇ m or more and 200 ⁇ m or less.
  • the release agent layer is preferably a layer formed from a release agent composition.
  • the release agent composition used to form the release agent layer is not particularly limited as long as it has release properties, and examples include silicone compounds; fluorine compounds; long-chain alkyl group-containing compounds; olefin resins, diene
  • a release agent composition having a thermoplastic resin material such as a thermoplastic resin as a main component can be used.
  • a release agent composition containing an energy ray-curable or thermosetting resin as a main component.
  • examples of the silicone compound include silicone compounds having organopolysiloxane as a basic skeleton. Further, examples of the silicone compound include thermosetting silicone compounds such as addition reaction type and condensation reaction type; energy ray curing type silicone compounds such as ultraviolet ray curing type and electron beam curing type; and the like.
  • examples of the fluorine compound include fluorine silicone compounds, fluorine boron compounds, and poly(perfluoroalkylene ether) chain-containing compounds.
  • the long-chain alkyl group-containing compound may be, for example, a polyvinyl carbamate obtained by reacting a long-chain alkyl isocyanate with a polyvinyl alcohol-based polymer. , an alkyl urea derivative obtained by reacting polyethyleneimine with a long-chain alkyl isocyanate, or a copolymer of a long-chain alkyl (meth)acrylate.
  • a long-chain alkyl-modified alkyd resin using a long-chain fatty acid as a modifier may be used as an alkyd resin obtained by a condensation reaction of a polyhydric alcohol and a polybasic acid.
  • a release agent composition containing an energy ray curable resin as a main component includes, for example, an energy ray curable compound having a reactive functional group selected from a (meth)acryloyl group, an alkenyl group, and a maleimide group, and a polyorganosiloxane.
  • an energy ray-curable compound and a polyorganosiloxane having mutually different molecular structures, polarities, and molecular weights are used, so components derived from the polyorganosiloxane are removed before curing. becomes segregated near the outer surface of the release agent layer, and is then hardened by energy rays to fix the segregation. Thereby, the releasability of the release agent layer can be improved.
  • the release agent composition containing an energy ray curable resin as a main component may further contain a photopolymerization initiator.
  • release agent compositions containing a thermosetting resin as a main component include release agent compositions containing a melamine resin as a main component and release agent compositions containing an epoxy resin as a main component.
  • release agent compositions containing a melamine resin as a main component include compositions containing a melamine resin as a main ingredient, an acid catalyst for thermosetting the melamine resin, and a polyorganosiloxane that imparts release properties to the release agent layer.
  • a release agent composition containing an epoxy resin as a main component includes an epoxy resin as a main ingredient, an acidic or basic thermosetting catalyst for thermally curing the epoxy resin, and a polyorganosiloxane that imparts releasability to the release agent layer.
  • examples include compositions containing the following. Before curing, components derived from polyorganosiloxane become segregated near the outer surface of the release agent layer, and then harden to fix the segregation. Thereby, the releasability of the release agent layer can be improved.
  • the release agent layer may contain other additives in addition to the above-mentioned resin components.
  • other additives include anti-aging agents, light stabilizers, flame retardants, conductive agents, antistatic agents, and plasticizers.
  • the thickness of the release agent layer can be selected as appropriate and is not particularly limited, but for example, preferably 0.02 ⁇ m or more and 5 ⁇ m or less, more preferably 0.03 ⁇ m or more and 2 ⁇ m or less, and still more preferably 0.03 ⁇ m or more and 5 ⁇ m or less. 05 ⁇ m or more and 1.5 ⁇ m or less.
  • the intermediate layer is a layer made of a silane compound that is hydrophilic and water-insoluble, and exhibits polycondensation properties by hydrolysis, from the viewpoint of easier removal of the coating layer from the surface of the intermediate layer on the base film side. It is preferable that there be.
  • the silane compound preferably contains at least one kind selected from a tetrafunctional silane compound represented by the following general formula (a) and an oligomer thereof as a main component.
  • Si(OR) p (X) 4-p (a) [In general formula (a), R represents an alkyl group, and X represents a halogen atom. When a plurality of R's exist, the plurality of R's may be the same or different from each other. When a plurality of Xs exist, the plurality of Xs may be the same or different from each other. p represents an integer from 0 to 4. ] The number of carbon atoms in the alkyl group is preferably 1 or more and 4 or less.
  • the silane compounds represented by the general formula (a) may be used alone or in combination of two or more.
  • the silane compound represented by the general formula (a) preferably includes a silane compound in which p in the general formula (a) is 4.
  • the silane compound in which p in the general formula (a) is 4 ie, the tetrafunctional silane compound
  • At least one of tetramethoxysilane and tetraethoxysilane, or a mixture of tetramethoxysilane and tetraethoxysilane is preferred.
  • Methodsilicate 51 is an average tetramer oligomer of methoxysilane
  • Methodhylsilicate 53A is an average heptamer oligomer of tetramethoxysilane
  • “Ethylsilicate 40” is an average pentamer oligomer of tetraethoxysilane
  • “Ethylsilicate 48” which is an average 10-mer oligomer of tetraethoxysilane
  • EMS-485" which is a mixture of an average 10-mer oligomer of tetramethoxysilane and an average 10-mer oligomer of tetraethoxysilane (both , manufactured by Colcoat Co., Ltd.).
  • the thickness of the intermediate layer is preferably 0.01 ⁇ m or more and 1 ⁇ m or less, more preferably 0.03 ⁇ m or more and 0.5 ⁇ m or less, and even more preferably 0.01 ⁇ m or more and 1 ⁇ m or less, from the viewpoint of easy water infiltration when the intermediate layer comes into contact with water. is 0.05 ⁇ m or more and 0.3 ⁇ m or less.
  • the removed coating layer residue has a structure having a release agent layer surface and a hydrophilic intermediate layer surface. becomes.
  • the surface of the release agent layer faces the air due to surface tension
  • the surface of the intermediate layer faces the water, resulting in stability.
  • debris with this configuration is more likely to exist at the boundary between water and air than in water.
  • the coating layer scum is an extremely thin film, it is thought that even if the density is a little high, the buoyancy due to surface tension will prevail, and since the intermediate layer is water-insoluble, it can continue to float on the water surface.
  • the laminated film used in each embodiment is generally used when manufacturing, transporting, storing, etc. other functional sheets and various parts used for specific applications. It is used for the purpose of protecting the surface of parts and parts. After actually fulfilling the role of protecting these parts, etc., they are often peeled off from the surface and discarded. Therefore, by using the laminated film, the coating layer and the base film can be easily separated from the laminated film, so this application has a high degree of contribution from the viewpoint of resource conservation and environmental protection.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

Procédé d'élimination d'une couche de revêtement, le procédé comprenant : une étape de découpe en petits fragments d'un film stratifié présentant un film de matériau de base et une couche de revêtement ; une étape de séparation, par immersion et agitation du film stratifié découpé (50) dans de l'eau chaude (HW) à l'intérieur d'une cuve d'agitation (21), du film stratifié (50) en film de matériau de base (51) et couche de revêtement ; une étape de récupération de film de matériau de base servant à récupérer le film de matériau de base (51) séparé ; et une étape de récupération de couche de revêtement servant à récupérer des déchets (52C) de la couche de revêtement séparée, la couche de revêtement comprenant une couche intermédiaire et une couche d'agent antiadhérent, et la couche intermédiaire étant disposée entre le film de matériau de base et la couche d'agent antiadhérent.
PCT/JP2023/010390 2022-03-30 2023-03-16 Procédé d'élimination de couche de revêtement et dispositif d'élimination de couche de revêtement WO2023189670A1 (fr)

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JP2022-057134 2022-03-30
JP2022057134A JP2023148863A (ja) 2022-03-30 2022-03-30 コーティング層の除去方法及びコーティング層の除去装置

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54178289U (fr) * 1978-06-07 1979-12-17
JPH03193417A (ja) * 1989-10-13 1991-08-23 Davidson Textron Inc インターフェース位置で連結する層状プラスチックを分離及び回収するための方法
JPH04326955A (ja) * 1991-04-25 1992-11-16 Miike Tekkosho:Kk 比重差による廃棄プラスチック材の選別機
JP2004050681A (ja) * 2002-07-22 2004-02-19 Toray Ind Inc セラミックグリーンシートの製造方法
JP2004363140A (ja) * 2003-06-02 2004-12-24 Toray Ind Inc 積層フィルムの剥離方法および剥離装置
JP2005138032A (ja) * 2003-11-07 2005-06-02 Satomi Seisakusho:Kk 残土分別装置及び残土の分別方法
JP2014019003A (ja) * 2012-07-13 2014-02-03 Fujimori Kogyo Co Ltd 複合材料の分別回収方法

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54178289U (fr) * 1978-06-07 1979-12-17
JPH03193417A (ja) * 1989-10-13 1991-08-23 Davidson Textron Inc インターフェース位置で連結する層状プラスチックを分離及び回収するための方法
JPH04326955A (ja) * 1991-04-25 1992-11-16 Miike Tekkosho:Kk 比重差による廃棄プラスチック材の選別機
JP2004050681A (ja) * 2002-07-22 2004-02-19 Toray Ind Inc セラミックグリーンシートの製造方法
JP2004363140A (ja) * 2003-06-02 2004-12-24 Toray Ind Inc 積層フィルムの剥離方法および剥離装置
JP2005138032A (ja) * 2003-11-07 2005-06-02 Satomi Seisakusho:Kk 残土分別装置及び残土の分別方法
JP2014019003A (ja) * 2012-07-13 2014-02-03 Fujimori Kogyo Co Ltd 複合材料の分別回収方法

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