WO2019225648A1 - Méthode de formation de film de revêtement - Google Patents

Méthode de formation de film de revêtement Download PDF

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Publication number
WO2019225648A1
WO2019225648A1 PCT/JP2019/020272 JP2019020272W WO2019225648A1 WO 2019225648 A1 WO2019225648 A1 WO 2019225648A1 JP 2019020272 W JP2019020272 W JP 2019020272W WO 2019225648 A1 WO2019225648 A1 WO 2019225648A1
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Prior art keywords
coating
coating liquid
coated
discharge port
coating film
Prior art date
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PCT/JP2019/020272
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English (en)
Japanese (ja)
Inventor
雅士 三宅
道平　創
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日東電工株式会社
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Application filed by 日東電工株式会社 filed Critical 日東電工株式会社
Priority to CN201980033858.9A priority Critical patent/CN112154034B/zh
Priority to KR1020207034553A priority patent/KR20210015829A/ko
Publication of WO2019225648A1 publication Critical patent/WO2019225648A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/26—Processes for applying liquids or other fluent materials performed by applying the liquid or other fluent material from an outlet device in contact with, or almost in contact with, the surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials

Definitions

  • the present invention relates to a coating film forming method.
  • a die coater that coats a coating liquid onto an object to be coated such as a substrate is used as one of coating apparatuses.
  • the coating apparatus 50 that is a die coater discharges the coating liquid 23 from the discharge port 53aa to the workpiece 21 that moves relatively while being supported by the support portion 65.
  • a die as a coating part 53 to be coated is provided.
  • the coating device 50 is applied to the coating object 21 by the coating unit 53 while moving the coating object 21, and the coating liquid 23 applied to the coating object 21 is solidified and applied.
  • a construction film 25 is formed.
  • the coating unit 53 includes an upstream die block 55 and a downstream die block 57 that are arranged to face each other so as to form a slot 58, and a leading edge of the slot 58 serves as a discharge port 53 aa. Yes.
  • the distance (gap) G between the workpiece 21 and the discharge port 53aa is the thickness of the coated coating solution 23, that is, the thickness of the coating film 25 before solidification ( Wet thickness) is set to about twice or less of T.
  • the gap G is set to 2.5 times or more the wet thickness T of the coating film, and the coating liquid is discharged straight from the discharge port along the direction perpendicular to the object to be coated.
  • a coating apparatus configured to cause a coating liquid to collide with an object to be coated by spraying in such a manner (see Patent Document 1).
  • the exit interval (slot width) of the slit (slot) is as narrow as 0.1 mm or less. For this reason, when applying the coating liquid to the coating object, due to this narrowness, the variation in the processing accuracy of the slot in the width direction of the coating object is large in the variation of the wet thickness of the coating liquid. As a result, a coating film having coating unevenness may be obtained. Such a coating film has a reduced quality.
  • an object of the present invention is to provide a coating film forming method capable of obtaining a coating film in which deterioration in quality due to coating unevenness is suppressed.
  • the coating film forming method according to the present invention is: An object to be coated that has a discharge port for discharging the coating liquid and moves relative to the discharge port.
  • the coating liquid having a predetermined elongation when the coating liquid is discharged from the discharge port to the coated object, a bulging portion that swells on the discharge port side, and Forming the bead having an extended portion extending downstream in the moving direction of the coated object so as to taper from the bulging portion to the coated object, and the discharge port and the coated object; Applying the coating liquid to the object to be coated while maintaining the state of tying, and According to the size of the bulging portion, the gap between the discharge port and the coating object is adjusted so that the bulging portion does not contact the coating object. It is a method of applying the coating liquid.
  • the bulging portion is a portion that swells more than a portion (extended portion) on the side of the object to be coated on the discharge port side, and is coated so as not to come into direct contact with the object to be coated. It means a part where a gap is formed between the workpiece.
  • the degree of elongation means that the coating liquid is discharged at a speed of 5 g / min from a opening of a cylindrical member having an inner diameter of 2 mm to a roll rotating at a rotational speed of 30 m / min at a position 1 mm away from the opening.
  • the predetermined extension may be 2 mm or more.
  • a gap between the object to be coated and the discharge port may be set to 0.5 to 2 mm.
  • the interval between the discharge ports may be 0.05 to 1.5 mm.
  • the schematic side view which shows the coating apparatus used for the coating film formation method of one Embodiment of this invention 1 is a schematic side view showing the periphery of the gap in FIG. 1 together with a schematic state in which the coating liquid is discharged.
  • Schematic side view showing an apparatus for measuring the elongation of a coating solution In Experimental example 1, the photograph which shows an example of the state in which the bulging part and extension part of the coating liquid are formed In Experimental example 1, the schematic side view which shows typically an example of the state in which the bulging part and extension part of a coating liquid are not formed In Experimental example 1, the schematic side view which shows typically an example of the state in which the bulging part and extension part of a coating liquid are not formed In Experimental Example 1, a photograph showing an example of a state where the bulging portion and the extending portion of the coating liquid are not formed Schematic side view showing the periphery of the gap of a conventional coating apparatus together with a schematic state in which the coating liquid is discharged
  • the coating apparatus 1 used in the coating film forming method of the present embodiment is The coating liquid 23 is discharged from the discharge port 3aa to the coating object 21 having a discharge port 3aa for discharging the coating liquid 23 and moving relative to the discharge port 3aa. It has a coating part 3 to work on,
  • the coating unit 3 is configured to solidify the coating solution 23 applied to the workpiece 21 to form a coating film 25.
  • the coating apparatus 1 when the coating liquid 23 having a predetermined elongation degree is discharged from the discharge port 3aa to the workpiece 21, the coating liquid 23 swells on the discharge port 3aa side.
  • 23b is formed so as to maintain a state of connecting the discharge port 3aa and the workpiece 21 while forming a bead having 23b.
  • the coating apparatus 1 is arranged between the discharge port 3aa and the workpiece 21 so that the bulging portion 23a does not contact the workpiece 21 according to the size of the bulging portion 23a.
  • the gap G is configured to be adjusted.
  • the coating apparatus 1 further includes a solidifying unit 13 that solidifies the coating liquid 23 applied by the coating unit 3 to form a coating film 25.
  • the coating apparatus 1 further includes a support portion 15 that moves relative to the coating portion 3 in the longitudinal direction of the workpiece 21 while supporting the workpiece 21 on the surface.
  • belt-shaped thing as shown in FIG. 1 is mentioned,
  • seat member etc. are mentioned.
  • An example of such a sheet member is a resin film.
  • a resin film the following resin films etc. are mentioned, for example. That is, the resin film is not particularly limited, and can be appropriately selected depending on the application.
  • polyester polymers such as polyethylene terephthalate and polyethylene naphthalate, cellulose polymers such as diacetyl cellulose and triacetyl cellulose, polycarbonate polymers, acrylic polymers such as polymethyl methacrylate, polystyrene Styrene polymer such as acrylonitrile-styrene copolymer, polyethylene, polypropylene, polyolefin having cyclic or norbornene structure, olefin polymer such as ethylene-propylene copolymer, vinyl chloride polymer, amide such as nylon and aromatic polyamide
  • a film made of a transparent polymer such as a base polymer can be suitably used.
  • resin films used for optical applications include imide polymers, sulfone polymers, polyether sulfone polymers, polyether ether ketone polymers, polyphenylene sulfide polymers, vinyl alcohol polymers, vinylidene chloride polymers, vinyl butyral.
  • a film made of a transparent polymer such as a polymer, an arylate polymer, a polyoxymethylene polymer, an epoxy polymer or a blend of the above-mentioned polymers can also be exemplified.
  • the workpiece 21 will be described later.
  • the support portion 15 supports the workpiece 21 that moves in the longitudinal direction from the opposite side of the coating portion 3.
  • the coating liquid 23 is applied to the workpiece 21 that is supported by the support portion 15 and moves relative to the coating portion 3.
  • Examples of the support portion 15 include a roll.
  • the support portion 15 is configured so that the workpiece 21 is relatively moved from one side (upper side in FIG. 1) to the other side with respect to the discharge port 3aa at a position facing the discharge port 3aa of the coating unit 3. (Below FIG. 1).
  • the solidifying unit 13 is configured to form the coating film 25 by solidifying the coating liquid 23.
  • the coating film 25 is formed by being solidified by the solidified portion 13.
  • the solidification part 13 should just be what can solidify the coating liquid 23, and is not specifically limited.
  • the solidifying part 13 is appropriately set according to the type of the coating liquid 23 and the like.
  • a die having a slot 8 is employed as the coating unit 3.
  • the coating apparatus 1 provided with a die in this way is called a die coater.
  • the coating unit 3 discharges the coating liquid 23 from the discharge port 3aa of the slot 8 to apply the coating liquid 23 onto the workpiece 21 that is relatively moving.
  • the coating unit 3 is disposed so that the discharge port 3aa of the slot 8 faces sideward (horizontal direction), and is applied to the workpiece 21 that is moving up and down relative to the discharge port 3aa.
  • the coating liquid 23 is discharged.
  • the coating liquid 3 is supplied to the coating part 3 from a container (not shown) for the coating liquid 23 via a pipe (not shown) and a pump (not shown).
  • the coating unit 3 includes an upstream die block 5 and a downstream die block 7 arranged to face the upstream die block 5.
  • the coating part 3 is formed by bringing the upstream die block 5 and the downstream die block 7 together.
  • the manifold 9 in which the coating liquid 23 supplied by a pump (not shown) is stored and the manifold 9 toward the leading edge are provided between them.
  • a slot 8 is formed. Further, a gap between the upstream lip portion 5 a that is the leading edge of the upstream die block 5 and the downstream lip portion 7 a that is the leading edge of the downstream die block 7 becomes the discharge port 3 aa of the slot 8. ing.
  • the upstream lip portion 5 a and the downstream lip portion 7 a are disposed so as to be positioned on a plane perpendicular to the radial direction R of the support portion 15.
  • the slot 8 is arranged in parallel with the radial direction R of the support portion 15.
  • the interval between the discharge ports 3aa that is, the length (slot width) in the moving direction M of the workpiece 21 is not particularly limited and can be set as appropriate. For example, if the slot width is too small, the variation in the processing accuracy of the slot 8 will have an adverse effect on the variation in the wet thickness of the coating film 25, and the variation may be unacceptable.
  • the slot width is preferably 0.05 to 1.5 mm, more preferably 0.1 to 1.5 mm, and further preferably 0.3 to 1.2 mm.
  • the coating condition range does not change. This is also preferable.
  • the length of the downstream lip portion 7a is preferably 0.1 mm or more and 4 mm or less.
  • the gap G is preferably 2.5 to 20 times, and more preferably 3 to 15 times the thickness of the coated coating solution 23 before solidification (wet thickness of the coating film 25).
  • the gap G is preferably 0.5 to 2 mm, and more preferably 0.5 to 1.5 mm.
  • FIG. 1 shows a mode in which the coating unit 3 continuously applies the coating liquid 23 to the strip-shaped coated object 21 that moves relatively.
  • the aspect of applying the coating liquid 23 is not limited to the aspect of FIG. FIG. 1 shows a mode in which the workpiece 21 moves clockwise, but the moving direction of the workpiece 21 is not particularly limited.
  • the coating film forming method of the present embodiment has a discharge port 3aa for discharging the coating liquid 23, and the discharge port 3aa is applied to an object to be coated 21 that moves relative to the discharge port 3aa.
  • the coating liquid 23 is applied to the workpiece 21 to form a coating film by using the coating apparatus 1 that discharges the coating liquid 23 to apply the coating liquid 23.
  • the coating liquid 23 having a predetermined elongation is used. That is, a material capable of forming a bead having the following shape is used.
  • a bulging portion 23a that swells on the discharge port 3aa side while forming a bead having an extended portion 23b extending obliquely toward the downstream side in the moving direction M of the workpiece 21 so as to taper from the protruding portion 23a to the workpiece 21,
  • the coating liquid 23 is applied to the coating object 21 while maintaining a state where the discharge port 3aa and the coating object 21 are connected.
  • the discharge port 3aa and the article to be coated are arranged so that the bulging part 23a does not contact the article to be coated 21 according to the size of the bulging part 23a.
  • the coating liquid 23 is applied to the workpiece 21 by adjusting the gap G between the coating liquid 21 and the workpiece 21.
  • the coating film forming method of this embodiment is: Coating of the coating apparatus 1 using the coating liquid 23 having the above-described elongation and adjusting the gap G so that the bulging portion 23a does not contact the workpiece 21 according to the size of the bulging portion 23a.
  • the coating liquid 23 that connects the discharge port 3aa and the article to be coated 21 is the above-described bulging portion 23a and extending portion 23b.
  • the coating liquid 23 from the discharge port 3 aa is formed so that a bead having a thickness is formed and the bulging portion 23 a is not in contact with the workpiece 21.
  • the discharge amount, the moving speed of the workpiece 21 and the arrangement of the coating unit 3 with respect to the workpiece 21 are set.
  • the coating liquid 23 having the above-described elongation is used, and a gap is provided so that the bulging portion 23 a does not contact the workpiece 21 according to the size of the bulging portion 23 a. Adjust G. Then, under the set conditions, the coating liquid 23 is discharged from the discharge port 3aa of the coating unit 3 to the object to be coated 21 for coating. Next, the coating liquid 23 applied on the workpiece 21 is solidified by the solidifying unit 13 to obtain a coating film 25.
  • the shape of the bulging portion 23 a and the extending portion 23 b of the coating liquid 23 is different from the discharge port 3 aa according to the type of the coating liquid 23, the wet thickness T of the coating film 25, and the moving speed of the workpiece 21. It is determined by adjusting the gap G with the workpiece 21.
  • the coating liquid 23 contains a solidifying component, and is applied to the object 21 to be solidified on the object 21.
  • the kind of the coating liquid 23 is a predetermined degree of elongation such that the coating liquid 23 that connects the discharge port 3aa and the workpiece 21 has a shape having the bulging portion 23a and the extending portion 23b. Can be set as appropriate.
  • the extension degree is rotated at a rotational speed of 30 m / min at a position 1 mm away from the opening of a cylindrical member (cylindrical member for measuring the extension degree) having an inner diameter of 2 mm.
  • the coating liquid 23 is discharged at a speed of 5 g / min to a roll (a roll for measuring the degree of elongation) and the distance between the opening of the cylindrical member and the roll (measurement gap D) is increased from 1 mm
  • the temperature of the coating solution 23 is set to 23 ⁇ 2 ° C.
  • the elongation degree of the coating liquid 23 is preferably 2 mm or more, and more preferably 5 mm or more, in that it tends to have a shape having the bulging portion 23 a and the extending portion 23 b.
  • the coating liquid 23 When the elongation degree of the coating liquid 23 is 2 mm or more, the coating liquid 23 is sufficiently easily stretched. Therefore, it is easy to form the bulging portion 23a so as not to come into contact with the article 21 to be coated. It becomes easy to form the extending part 23b without. Thus, formation of the bulging part 23a and the extension part 23b becomes easy. Therefore, it is possible to more reliably obtain the coating film 25 in which the deterioration in quality due to the coating unevenness is suppressed.
  • the upper limit of the degree of elongation is not particularly limited, and can be set as appropriate.
  • the degree of elongation of the coating liquid 23 is preferably 100 mm or less, and more preferably 50 mm or less.
  • Examples of the coating solution 23 include a polymer solution, and examples of the material used as the solidifying component include a thermosetting material, an ultraviolet curable material, and an electron beam curable material.
  • the coating liquid 23 include an adhesive.
  • an acrylic polymer is preferable as the coating liquid 23, for example, an acrylic polymer is preferable. By using this, there is an advantage that a polarizing plate can be produced.
  • the viscosity of the coating liquid 23 is preferably 0.1 Pa ⁇ s or more and 100 Pa ⁇ s or less, more preferably 0.5 Pa ⁇ s or more and 20 Pa ⁇ s or less, and further preferably 1 Pa ⁇ s or more and 20 Pa ⁇ s or less. It is. Such a viscosity is a value measured by a measuring method described in Examples described later.
  • the viscosity of the coating liquid 23 is 0.1 Pa ⁇ s or more, there is an advantage that the coating film is hardly affected by drying.
  • the viscosity of the coating liquid 23 is 100 Pa ⁇ s or less, there is an advantage that a known pump can be used widely and the handling property of the coating liquid is excellent.
  • the density of the coating liquid 23 is preferably 700 ⁇ 1500kg / m 3, more preferably 800 ⁇ 1400kg / m 3, more preferably 800 ⁇ 1000kg / m 3. Such a density is a value measured by a measuring method described in Examples described later.
  • the thickness (the wet thickness of the coating film 25) T of the coated coating solution 23 is not particularly limited, and can be set as appropriate.
  • the thickness T is adjusted, for example, by adjusting at least one of the discharge amount of the coating liquid 23 from the coating unit 3 and the moving speed of the workpiece 21 according to the viscosity of the coating liquid 23. obtain.
  • the thickness T of the coated coating solution 23 is preferably 1 ⁇ m or more and 500 ⁇ m or less, and more preferably 10 ⁇ m or more and 300 ⁇ m or less.
  • the thickness T is a value measured by the measurement method described in the examples described later.
  • the discharge amount (flux) of the coating liquid 23 from the discharge port 3aa of the coating unit 3 can be, for example, 8.3 ⁇ 10 ⁇ 8 to 2.5 ⁇ 10 ⁇ 3 m 2 / s.
  • the discharge amount of the coating liquid 23 from the discharge port 3aa can be adjusted, for example, by adjusting the supply speed of the coating liquid supplied to the coating unit 3 by the pump (not shown).
  • the thickness of the object to be coated 21 is not particularly limited, but is preferably 5 to 500 ⁇ m, for example.
  • FIG. 1 shows an aspect in which the article to be coated 21 is a long and flexible object, other aspects in which the article to be coated 21 is a single plate or inflexibility are shown. An aspect can also be employ
  • the moving speed of the workpiece 21 can be adjusted, for example, by adjusting the rotational speed of the support portion 15.
  • a moving speed is preferably 5 to 300 m / min, more preferably 10 to 100 m / min, still more preferably 10 to 50 m / min.
  • the moving speed of the workpiece 21 is 5 m / min or more, there is an advantage that the drive system is stabilized.
  • the moving speed of the object to be coated 21 is 300 m / min or less, it is difficult for air to enter between the object to be coated 21 and the coating liquid 23. There is an advantage that meandering due to air entrainment between them can be suppressed.
  • the coating liquid 23 has a viscosity of 1 to 20 Pa ⁇ s, a density of 800 to 1000 kg / m 3 , and an object to be coated 21. It is more preferable that the moving speed is 5 to 50 m / min.
  • the gap G between the object to be coated 21 and the discharge port 3aa may be set as appropriate so that the bulging portion 23a does not contact the object to be coated 21, and is not particularly limited. 0.5 to 2 mm is preferable, and 0.5 to 1.5 mm is more preferable.
  • Patent Document 1 unlike the coating apparatus of FIG. 8, the coating liquid is ejected straight and in a film form. For this reason, when applying the coating liquid to the object to be coated, the variation in the processing accuracy of the slot in the width direction of the object to be coated has a great influence on the variation in the wet thickness of the coating liquid. There is a possibility that a coating film having unevenness of work may be obtained.
  • the inventors of the present invention have further studied earnestly by paying attention to the appearance shape of the coating liquid existing from the discharge port to the object to be coated.
  • the coating liquid (bead) connecting the discharge port and the object to be coated swells on the discharge port side, and the swelled portion.
  • the object can be coated without causing uneven coating.
  • a coating liquid can be applied to a workpiece.
  • such a shape uses a coating liquid having a degree of elongation such that the bulging part and the extending part are formed, and the interval between the discharge port and the object to be coated is set according to the coating liquid. It has been found that it can be realized by adjusting.
  • the bulging portion is not formed.
  • the gap is larger than the proximity coating, if the size is not sufficient, for example, as shown in FIG.
  • the variation in wet thickness increases both in the direction of movement of the article to be coated and in the direction perpendicular to the movement direction (width direction), which may cause uneven coating.
  • the gap becomes too large, as shown in FIGS. 6 and 7, the extended portion is interrupted (the discharge port and the object to be coated are not connected by the coating liquid), and the coating becomes impossible. Even if it can be applied, streaky coating unevenness may occur.
  • the shape of the coating liquid in the gap is the specific shape, it has been found that it is possible to obtain a coating film in which deterioration in quality due to coating unevenness is suppressed. It came to complete the coating film formation method of embodiment.
  • the coating film forming method of this embodiment is The coating liquid 23 is discharged from the discharge port 3aa to the coating object 21 having a discharge port 3aa for discharging the coating liquid 23 and moving relative to the discharge port 3aa.
  • the coating liquid 23 is applied to the workpiece 21.
  • the gap G is larger than that of the conventional proximity coating as shown in FIG. 8, so that it is possible to suppress the occurrence of coating unevenness due to the gap G being too small.
  • the gap G is larger than that of the proximity coating, if the size is not sufficient, the swelled portion (swelled portion) 23a of the coating liquid 23 may come into contact with the workpiece 21.
  • the gap G by adjusting the gap G as described above, it is possible to suppress the occurrence of coating unevenness due to the variation in the wet thickness of the coating film 25 caused by this contact. Furthermore, it is possible to suppress the occurrence of coating unevenness caused by the coating liquid 23 being interrupted, which is generated when the gap G is too large.
  • the predetermined elongation is 2 mm or more.
  • the coating liquid 23 can be sufficiently stretched, so that it is easy to form the bulging portion 23 a so as not to contact the workpiece 21, and it is interrupted. It becomes easy to form the extending part 23b without. Therefore, it is possible to more reliably obtain the coating film 25 in which the deterioration in quality due to the coating unevenness is suppressed.
  • the gap G between the coating object 21 and the discharge port 3aa is preferably set to 0.5 to 2 mm.
  • the gap G By setting the gap G to 0.5 mm or more, it is possible to further suppress appearance defects, particularly point defects, of the coating film 25.
  • the interval (slot width) of the discharge ports 3aa is 0.05 to 1.5 mm.
  • the interval between the discharge ports 3aa is too small, the variation in the processing accuracy of the slot 8 may have an adverse effect on the variation in the wet thickness of the coating film 25, and the variation may be unacceptable.
  • the interval between the discharge ports 3aa is too large, the internal pressure of the die is lowered, and the coating liquid 23 cannot be uniformly distributed in the width direction inside the die, and there is a possibility that the variation in the wet thickness of the coating film 25 cannot be allowed. .
  • the interval between the discharge ports 3aa is 1.5 mm or less, it is possible to more uniformly distribute the coating liquid 23 in the width direction inside the die while suppressing a decrease in the internal pressure of the die. 25 variation in wet thickness can be suppressed. Therefore, it is possible to more reliably obtain the coating film 25 in which the deterioration in quality due to the coating unevenness is suppressed.
  • a coating film forming method in which deterioration in quality due to coating unevenness is suppressed is provided.
  • the coating film forming method of the present embodiment is as described above, but the present invention is not limited to the above-described embodiment, and can be appropriately modified within the intended scope of the present invention.
  • Coating object Polyethylene terephthalate (PET) film (Product name: Diamond wheel, manufactured by Mitsubishi Plastics)
  • Coating solution Acrylic polymer solutions A to H (see Table 1), Solvent: Toluene, Ethyl acetate
  • the density of the coating solution was measured by using the density measuring function of a Coriolis flow meter (Promass 83F, manufactured by Endless Hauser).
  • Example 1 Using the above materials, the coating solution was discharged onto the article to be coated under the conditions described below and in Table 1, and the coating state was examined by the following method. The results are shown in Table 1. Moreover, the result about the coating state in case a gap is 1.0 mm is shown in FIG. 4, the result about the coating state in case a gap is 0.2 mm is shown in FIG. The result about a coating state is shown in FIG.6 and FIG.7.
  • the wet thickness of the coating film was measured in-line using a spectral interference thickness meter (Si-T, manufactured by Keyence Corporation).
  • the gap was 0.2 mm, it was in the state of proximity coating, and appearance defects (point defects) occurred.
  • the coating liquid that connects the discharge port and the object to be coated has a bulging portion and an extending portion, but the bulging Such a portion contacted the object to be coated, and no bulging portion was formed.
  • the coating liquid applied to the object to be coated was solidified, and then the object to be wound was wound. Occurred and could not be wound well. As a result, it was found that when the gap was 2.5 mm or more, an appearance defect with a high height occurred and a winding failure could occur.
  • Example 2 Using the acrylic polymer solutions D and G of Experimental Example 1 (see Table 1) and changing the slot width to 0.3 mm and 1.2 mm, the coating liquid was applied to the object to be coated in the same manner as Experimental Example 1. The coating state was evaluated. The results are shown in Table 2. In Table 2, in the acrylic polymer solutions D and G, the result in the case of the slot width of 0.6 mm is the result of the experiment example 1.
  • PET Polyethylene terephthalate
  • Coating liquid (1) acrylic polymer solution, solvent: toluene, ethyl acetate Polymer average weight molecular weight: about 800,000 Polymer concentration: 2.6 wt% (Coating conditions)
  • Coating width 150mm Distance (gap) between workpiece and discharge port: 0.5mm

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  • Wood Science & Technology (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Coating Apparatus (AREA)

Abstract

Dans une méthode de formation d'un film de revêtement, dans laquelle un dispositif de revêtement est utilisé pour former un film de revêtement par revêtement d'un liquide de revêtement sur un objet revêtu, un liquide ayant un degré d'allongement prescrit est utilisé en tant que liquide de revêtement, et un espace entre un orifice de décharge et l'objet revêtu est ajusté de telle sorte qu'une partie renflée d'une bille n'entre pas en contact avec l'objet revêtu, tandis que ladite bille comprenant la partie renflée et une partie étendue est formée.
PCT/JP2019/020272 2018-05-22 2019-05-22 Méthode de formation de film de revêtement WO2019225648A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201980033858.9A CN112154034B (zh) 2018-05-22 2019-05-22 涂布膜形成方法
KR1020207034553A KR20210015829A (ko) 2018-05-22 2019-05-22 도공막 형성 방법

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Application Number Priority Date Filing Date Title
JP2018-097673 2018-05-22
JP2018097673A JP6554580B1 (ja) 2018-05-22 2018-05-22 塗工膜形成方法

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WO2019225648A1 true WO2019225648A1 (fr) 2019-11-28

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JP (1) JP6554580B1 (fr)
KR (1) KR20210015829A (fr)
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TW202003119A (zh) 2020-01-16
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