JP2005046706A - Method for manufacturing coating layer body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing a coating layer, in which the coating layer is formed on a support while continuously conveying the supports each having a connection part joined by an adhesive tape and the coating layer is dried without splitting the coating layer and generating wrinkles in the connection part and which is particularly suitable for manufacturing ink-jet recording paper. <P>SOLUTION: This method for manufacturing the coating layer comprises a first application step 16 to apply a coating liquid containing an inorganic fine particle, a water-soluble resin and a mordant to the support 14 and form a color material receptive layer while continuously conveying the supports 14 each having the connection part joined by the adhesive tape 38 and a first drying step 18 to dry the color material receptive layer so that the layer is not dried fully at the least. When the ink-jet recording paper is manufactured, the thickness of the adhesive tape 38 is made to be ≥30 μm and ≤100 μm and the Hunter whiteness degree of the adhesive tape 38 is made to be ≥20% when the Hunter whiteness degree of the support 14 is ≥80%. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method for producing a coating layer body, and in particular, inkjet recording as a coating layer body while performing continuous operation by joining a current support being used and a new support to be used next with an adhesive tape. The present invention relates to a method for producing a coating layer suitable for producing paper.

  In general, when a coating solution is applied to a support transported via a transport means such as a transport roller by a coating coater, the rear end of the current support being applied and the new support to be applied next are applied. By continuously applying the front end with an adhesive tape, the application operation is not stopped when the current support is switched to the new support.

  However, the joining portion joined by the adhesive tape is liable to cause coating failure such as coating unevenness and coating streaks due to a difference in level between the support and the adhesive tape. For this reason, when applying a coating liquid to the support body which has the junction part joined by the adhesive tape, various measures are proposed in order to reduce the product loss by the coating failure which generate | occur | produces in a junction part.

For example, Patent Document 1 discloses that a hydrophobic liquid is applied in advance to a surface to be coated of a joint before applying a coating liquid to the joint. Patent Document 2 discloses that a black layer is provided at the joint and the surface potential is charged to 0.5 to 2.0 kV for application.
JP-A-54-62241 Japanese Patent No. 2632265

  However, the joint part joined with the adhesive tape has a coating layer applied on the adhesive tape in the drying process after application separately from the application failure due to the joint part, and the coating film fragments dropped from the application layer are in the process. And adheres to the normal colorant receiving layer before and after the joint and causes a problem of the coated surface. Furthermore, there is also a problem of process contamination due to falling off of the broken film fragments. This problem cannot be solved by the above-mentioned Patent Documents 1 and 2, and there is actually no effective countermeasure.

  The problem that the coating layer applied on the adhesive tape is easily broken is particularly likely to occur in the manufacturing process of an ink jet recording sheet formed by coating a colorant receiving layer containing at least inorganic fine particles and a water-soluble resin. Among the production of the ink jet recording paper, a coating material containing inorganic fine particles and a water-soluble resin as disclosed in JP-A-2001-1631 is applied to a support to form a colorant receiving layer, and then dried in a raw state. When a colorant receiving layer is hardened by applying a solution containing a crosslinking agent onto the colorant receiving layer, or a coating solution containing inorganic fine particles, a water-soluble resin and a crosslinking agent is applied to the support. After forming the material-receiving layer, there is a tendency that the color material-receiving layer is hardened particularly by applying a basic coating liquid on the color material-receiving layer in a dry state.

  Further, as a problem of the adhesive tape in the production of the coated layer body, in addition to the above-mentioned problem of cracking, the drying temperature of the colorant receiving layer in the production of the ink jet recording paper is the same as that of the photographic printing paper using the same support. In many cases, the coated layer is dried at a high temperature as compared with the drying of the coating layer in the production of the above, and there is a problem that the tape exposed to the high temperature is stretched, the tension of the support becomes uneven, and wrinkles are easily generated on the support. When wrinkles occur on the support, the coating layer surface is easily broken by wrinkles.

  The present invention has been made in view of such circumstances, and while continuously conveying a support having a bonded portion bonded with an adhesive tape, an application layer is formed on the support, and the application layer is dried. In this case, the coating layer applied on the adhesive tape is not cracked and wrinkles are not generated at the joint, and a method for producing a coating layer particularly suitable for manufacturing an inkjet recording paper is provided. Objective.

  The inventor examined the reason why the coating layer applied on the adhesive tape (hereinafter referred to as “tape coating layer”) is easily broken in the drying process, and the drying rate of the tape coating layer was applied to the support. It has been found that this is caused by the fact that it is faster than the layer (hereinafter referred to as “support coating layer”). In particular, when applying a coating liquid for hardening a color material receiving layer to a color material receiving layer in a dry state, such as when manufacturing an inkjet recording paper as a coating layer body, the tape coating layer dries too quickly. Then, since the hardened film of the tape coating layer is not made at all, a remarkable crack occurs in the tape coating layer. In addition, the coating layer is thinly applied to the step portion between the support and the adhesive tape, and is easily dried, so that cracking is likely to occur.

  The present inventor has found that this can be solved by appropriately setting the thickness of the adhesive tape and / or the color on the anti-adhesive surface side of the adhesive tape. That is, since the coating liquid is pulled at the step portion between the support and the adhesive tape, it becomes a factor of extreme thinning of the coating layer at the step portion. Therefore, as the thickness of the adhesive tape is reduced, the tape coating layer can be prevented from being thinned, and the difference in the drying rate between the tape coating layer and the support coating layer can be eliminated to prevent cracking of the tape coating layer. On the other hand, if it is too thin, the adhesive tape is stretched and the tension of the support becomes non-uniform, causing wrinkles on the support and causing cracks due to wrinkles. Accordingly, there is an appropriate thickness of the adhesive tape for suppressing cracking of the tape coating layer without generating wrinkles.

  Further, the color on the anti-adhesive surface side of the adhesive tape affects the amount of drying heat absorbed by the adhesive tape in the drying process. A blackish color easily absorbs heat of drying, and a whitish color hardly absorbs heat of drying. In addition, the support has a white color, and particularly the support used for inkjet recording paper has high Hunter whiteness. Therefore, when the hunter whiteness on the anti-adhesive side of the adhesive tape is closer to the hunter whiteness of the support, the difference in drying speed between the tape coating layer and the support coating layer can be reduced, and the tape coating layer is cracked. Can be suppressed. The present invention has been made based on such findings.

  In order to achieve the above object, the first aspect of the present invention provides a coating layer by applying a coating solution on the support while continuously transporting the support having a bonded portion bonded with an adhesive tape. In the manufacturing method of the coating layer body provided with the coating process to form and the drying process which dries this coating layer, the thickness of the said adhesive tape shall be 30 micrometers or more and 100 micrometers or less, It is characterized by the above-mentioned. Here, the thickness of the adhesive tape is the sum of the thickness of the adhesive layer and the thickness of the tape substrate such as a film, paper, or cloth.

  According to the invention of claim 1, since the thickness of the adhesive tape is reduced to 100 μm or less, not only can the thickness difference between the tape coating layer thickness and the support coating layer thickness be reduced, but also the step portion between the support and the adhesive tape. In addition, since the coating solution is applied smoothly, the thickness of the coating layer at the stepped portion is not extremely reduced and the coating layer is not disturbed. Thereby, it can suppress effectively that a tape application layer and the application layer of a level | step-difference part are cracked by a drying process. In this case, the thinner the thickness of the adhesive tape, the greater the effect of preventing the coating layer from cracking. However, when the thickness of the adhesive tape is reduced to less than 30 μm, the adhesive tape stretches due to the tension of conveying the support and The tension becomes uneven and wrinkles on the support, and the tape coating layer may be cracked due to wrinkles. Therefore, the thickness of the adhesive tape needs to be 30 μm or more and 100 μm or less, and preferably 35 μm or more and 80 μm or less.

  In order to achieve the above object, the invention according to claim 2 applies the coating liquid on the support while continuously transporting the belt-like support having the joint portion joined by the adhesive tape. In the manufacturing method of the coating layer body provided with the application | coating process which forms a layer, and the drying process which dries this coating layer, when the hunter whiteness of the said support body is 80% or more, the anti-adhesive surface of the said adhesive tape The hunter whiteness on the side is 20% or more.

  Here, the hunter whiteness can be measured with a hunter type colorimetric color difference meter as described in JIS-P8123, and the complete whiteness is defined as 100%.

  According to the invention of claim 2, when the hunter whiteness of the support is 80% or more, the hunter whiteness on the anti-adhesive side of the adhesive tape is 20% or more. It is possible to reduce the endothermic difference between the amount of drying heat absorbed by the substrate and the amount of drying heat absorbed by the support. Thereby, since the difference of the drying rate of a tape application layer and the drying rate of a support body coating layer can be made small, it can suppress effectively that a tape application layer cracks.

  The relationship between the hunter whiteness of the support and the hunter whiteness on the anti-adhesive surface side of the adhesive tape may be at least the relationship of claim 2, but in order to more effectively suppress cracking of the tape coating layer. As in claim 3, it is better if the hunter whiteness on the anti-adhesive surface side of the adhesive tape and the hunter whiteness of the support are the same. Thereby, since the heat absorption difference between the amount of drying heat absorbed by the adhesive tape and the amount of drying heat absorbed by the support can be eliminated, the tape coating layer can be further prevented from cracking. In this case, for example, when the thickness of the tape coating layer is thinner than the thickness of the support coating layer, and the drying rate is too fast due to the tape coating layer, the anti-adhesive surface of the adhesive tape The hunter whiteness on the side is preferably made higher than the hunter whiteness of the support, and the amount of drying heat absorbed by the adhesive tape is preferably smaller than the amount of drying heat absorbed by the support. As a result, when the thickness of the tape coating layer is thinner than the thickness of the support coating layer, the drying of the tape coating layer proceeds too much. This is because it can be offset by setting it higher.

  In order to achieve the above-mentioned object, the invention according to claim 4 applies a coating solution on the support while continuously transporting the support having a joint portion bonded with an adhesive tape, thereby forming a coating layer. In the manufacturing method of the coating layer body provided with the application | coating process to form and the drying process which dries this coating layer, while making the base material thickness of the said adhesive tape 30 micrometers or more and 100 micrometers or less, the Hunter whiteness of the said support body Is 80% or more, the Hunter whiteness on the anti-adhesive surface side of the adhesive tape is 20% or more.

  This is because the invention of claim 1 is combined with the invention of claim 2 and is more effective in suppressing cracking of the tape coating layer.

  According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the coating liquid is a coating liquid for forming a color material receiving layer containing inorganic fine particles and a water-soluble resin, and the coating layer body is an ink jet recording sheet. It is characterized by being.

  This is because, when an inkjet recording paper is manufactured as a manufacturing of the coating layer body, in the case of a coating liquid for forming a colorant receiving layer containing inorganic fine particles and a water-soluble resin, the tape coating layer is particularly easily broken. This is because the invention is effective.

  A sixth aspect of the present invention is the method according to the fifth aspect, wherein after the color material receiving layer is applied and formed, a solution containing a crosslinking agent is applied onto the color material receiving layer in a dry state to harden the color material receiving layer. Features.

  This is the case in the manufacture of ink jet recording paper in which a coloring material receiving layer containing inorganic fine particles and a water-soluble resin is applied and formed, and then a solution for hardening is applied on the color material receiving layer in a dry state. This is because the tape coating layer is more easily broken and the present invention is extremely effective.

  A seventh aspect of the present invention is the method according to the fifth aspect, wherein the coating liquid contains the inorganic fine particles, a water-soluble resin, and a cross-linking agent, and after the color material receiving layer is formed by coating, The base material is coated with a basic coating solution to harden the color material receiving layer.

  This is an inkjet that hardens a color material receiving layer by applying a basic coating liquid on the color material receiving layer while the color material receiving layer containing inorganic fine particles, a water-soluble resin and a crosslinking agent is in a dry state. This is because the tape coating layer is more easily broken in the production of recording paper, and the present invention is extremely effective.

  As described above, according to the method for producing a coated layer body according to the present invention, the coating layer is formed on the support while continuously transporting the support having the joint portion joined by the adhesive tape. When the coating layer is dried, the coating layer applied on the adhesive tape is not broken and wrinkles are not generated at the joint. Therefore, the present invention is particularly suitable for manufacturing ink jet recording paper.

  BEST MODE FOR CARRYING OUT THE INVENTION The best mode for carrying out the method for producing a coated layer body according to the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 is an example showing a production line of an ink jet recording paper manufacturing method which is the best embodiment of the method for manufacturing a coated layer according to the present invention, and will be described below as an example of ink jet recording paper manufacturing.

  As shown in FIG. 1, an inkjet recording paper production line 10 mainly includes a feeding process 12 and a first coating process 16 in which a coating material is applied to a support 14 that is continuously conveyed to form a colorant receiving layer. A first drying step 18 for drying the color material receiving layer in a dry state, and a second application for applying a coating solution for hardening the color material receiving layer on the color material receiving layer in the dry state It comprises a step 20, a second coating step 22 for drying the colorant receiving layer to product moisture after the second coating step, and a winding step 24. As the support 14 in the production of the ink jet recording paper, a support 14 laminated with polyethylene is usually used, and its hunter whiteness is 80% or more.

  In the delivery step 12, a turret device 26, a support joining device 28, and a dancer roller device 30 are provided in order from the conveying direction of the support 14. The turret device 26 has two arms that rotate and change positions so that the feeding of the support 14 can be continuously performed without stopping, and the ends of the two arms are wound in a roll shape. The rotated current support 14A in use and the new support 14B which is wound into a roll and used next are supported. Then, as shown in FIG. 2, in order to butt-join the rear end of the current support 14 </ b> A and the front end of the new support 14 </ b> B with the support joining device 28, the current support 14 </ b> A is sucked and held by the sucker 32. At the same time, the front end of the new support 14B is transported to the joining machine 34 by a transport device (not shown), and the joint 36 where the rear end of the current support 14A and the front end of the new support 14B are abutted is joined by the adhesive tape 38. During this joining, the dancer roller 30A of the dancer roller device 30 moves in the direction A, so that the coating speed (conveying speed of the support 14) is maintained at a constant speed in the first coating process 16 without decreasing. However, the support bonding apparatus 28 can stop the conveyance of the support 14 and perform the bonding operation. In this case, in FIG. 2, the adhesive tape 38 is affixed only to the application surface side of the support 14, but when a back layer is formed on the back surface of the application surface side, the adhesive tape 38 is also affixed to the back surface. Also good.

  The adhesive tape 38 that joins the joint portion of the current support 14A and the new support 14B uses a tape having a thickness of 30 μm or more and 100 μm or less, and when the Hunter whiteness of the support 14 is 80% or more, the adhesive tape The Hunter whiteness on the side of the anti-adhesive side of 38 is 20% or more. Here, the thickness of the adhesive tape 38 is the total of the thickness of the adhesive layer and the thickness of the tape base material such as a film, paper, or cloth. As the tape base material, PET tape (polyethylene terephthalate tape), cellophane tape, vinyl tape, craft tape, cloth tape, etc. subjected to aluminum vapor deposition, black layer content, translucent processing, coloring processing, etc. can be used. . Moreover, the adhesive agent should just have sufficient adhesive strength with a laminated surface in the support body temperature in normal temperature and the drying process in a drying process.

  Then, a coating solution containing inorganic fine particles, a water-soluble resin, and a crosslinking agent is applied to the surface of the support 14 delivered from the delivery step 12 by the slide bead type coating coater 40 in the first application step 16. . At this time, when the adhesive tape 38 affixed to the joint portion 36 passes through the slide bead type coating coater 40, the coating liquid is also applied onto the adhesive tape 38. As a result, a color material receiving layer is formed on the support 14 and the adhesive tape 38.

  Next, after the moisture content of the coloring material receiving layer is dried to a raw dry state of 1000 to 300% by weight (moisture / solid content) by the split hot air dryer 42 in the first drying step 18, the second coating step A basic coating solution is applied onto the colorant receiving layer with 20 extrusion coating coaters 44. Thereby, the color material receiving layer is hardened. Finally, the colorant receiving layer is dried by the hot air dryer 46 in the second drying step 22 until the product moisture is obtained, and is wound on the take-up reel 48 in the winding step 24. Thereby, an inkjet recording paper is manufactured.

  The coating coater used in the first coating process 16 and the second coating process 20 is not particularly limited. In addition to the above-described slide bead type coater 40 and extrusion type coater 44, a roll coater, a blade Various coating coaters such as a coater and an air knife coater can be used. Further, the hot air dryer used in the first drying step 18 and the second drying step 22 is not particularly limited, but the hot air dryer 42 for drying the colorant receiving layer has a plurality of drying zones. What is divided | segmented into 18A-18E and can set to different drying conditions for every drying zone 18A-18E can be used conveniently. Furthermore, an infrared dryer etc. can be used besides a hot air dryer.

  In the first drying step 18 in the manufacture of the ink jet recording paper, the drying conditions are set so that the color material receiving layer (hereinafter referred to as “support coating layer”) applied to the support 14 is in the above-described dry state. ing. Therefore, when the color material receiving layer (hereinafter referred to as “tape coating layer”) applied to the adhesive tape 38 passes through the first drying step 18 and is dried, the drying speed of the tape coating layer is determined by the support coating. If the drying speed of the layer becomes faster and the drying of the tape coating layer proceeds too much, the tape coating layer does not harden at all in the second coating step 20 and the tape coating layer cracks significantly.

  Therefore, in the present invention, as described above, the adhesive tape 38 for joining the joint portion of the current support body 14A and the new support body 14B has a thickness of 30 μm or more and 100 μm or less, and the hunter of the support body 14 is used. When the whiteness was 80% or more, the Hunter whiteness on the anti-adhesive surface side of the adhesive tape 38 was set to 20% or more. With this tape thickness, not only can the coating thickness difference between the tape coating layer and the support coating layer be reduced, but also the coating solution can be smoothly applied to the step portion 50 (see FIG. 2) between the support 14 and the adhesive tape 38. Therefore, the coating layer thickness of the stepped portion 50 does not become extremely thin and the coating layer is not disturbed. Thereby, it can prevent that the drying of a tape application layer progresses more than a fresh-dry state in the 1st drying process 18. FIG. Further, since the adhesive tape 38 is stretched and the tension of the support 14 becomes unstable and the support 14 does not wrinkle, cracking of the tape coating layer due to wrinkles of the support 14 can also be prevented. In this case, the thickness of the adhesive tape 38 is more preferably 35 μm or more and 80 μm or less.

  Furthermore, when the hunter whiteness of the support 14 is 80% or more, the hunter whiteness on the anti-adhesive surface side of the adhesive tape 38 is 20% or more. Therefore, in the first drying step 18, the adhesive tape is used. The endothermic difference between the amount of drying heat absorbed by the plate 38 and the amount of drying heat absorbed by the support 14 can be reduced. Thereby, it can prevent that the drying of a tape application layer progresses more than a fresh-dry state in the 1st drying process 18. FIG. In this case, it is ideal if the Hunter whiteness of the adhesive tape 38 and the Hunter whiteness of the support 14 are the same.

  Accordingly, in the second coating step 20, the basic coating liquid can be applied to the tape coating layer in a dry state, so that the tape coating layer can be appropriately hardened. As a result, even in the case of a coating layer body in which cracking is likely to occur in the tape coating layer as in the manufacture of ink jet recording paper, the tape coating layer is not broken and the coating film fragments are not dropped off in the process according to the present invention.

  In the present embodiment, as the adhesive tape 38, when the substrate thickness is 30 μm or more and 100 μm or less, and when the hunter whiteness of the support 14 is 80% or more, the anti-adhesive surface side of the adhesive tape 38 Although the example which combined both the requirements that the hunter whiteness is 20% or more has been described, cracking of the tape coating layer can be suppressed by only one of the coating forms.

  Hereinafter, in the example of the inkjet recording paper production line 10 shown in FIG. 1, it was tested how the tape coating layer cracks when the thickness of the adhesive tape 38 was changed. Further, when the coating liquid was applied using the support 14 having a Hunter whiteness of 88%, it was tested how the crack of the tape coating layer would occur when the Hunter whiteness of the adhesive tape 38 was changed. The present invention is not limited to these examples.

In the production of the ink jet recording paper, the conditions of the support 14, the preparation of the colorant-receiving layer coating solution, the creation of the basic coating solution, and the first coating / drying to the second coating / drying are as follows. In the examples, “parts” and “%” all represent “parts by mass” and “% by mass”.
[Support]
A base paper having a basis weight of 160 g / m ² and a polyethylene laminate having a thickness of 20 μm was used on both sides. Further, a substrate having a Hunter whiteness of 88% on the coated surface side of the support 14 was used.
[Preparation of colorant receiving layer coating solution]
(4) Silica fine particles were added while stirring with a dissolver a mixture of (1) distilled water, (2) a hardener, and (3) a dispersant having the following composition. After completion of the addition, the mixture was dispersed for 120 minutes at a rotational speed of 2000 rpm using a dissolver, and then atomized using a sand grinder to obtain a silica fine particle dispersion. Further, after storing the silica fine particle dispersion at 30 ° C. for 24 hours, a colorant receiving layer is prepared by mixing (5) a water-soluble resin aqueous solution, (6) a surfactant, and (7) a surfactant having the following composition: Got.
(1) Distilled water 1800Kg
(2) Hardener (Boric acid) 12Kg
(3) Dispersant (acrylic cationic polymer 40% aqueous solution) 60Kg
(4) Silica fine particles (inorganic fine particles) 300Kg
(5) Water-soluble resin aqueous solution Distilled water 800Kg
Diethylene glycol monobutyether 10Kg
60kg of PVA (polyvinyl alcohol ... made by Kuraray)
Hydroxypropylcellulose (Nippon Soda HPC-SSL) 4Kg
After mixing, heat at 95 ° C for 180 minutes and cool to 30 ° C
(6) Surfactant (Polyoxyethylene oleyl ether 10% solution) 30Kg
(7) Surfactant (Fluorosurfactant 10% solution) 15Kg
[Preparation of basic coating solution]
A basic coating solution (PH 9.6) having the following composition was prepared at a temperature of 30 ° C.
(1) Boric acid (crosslinking agent 100%) 6.5Kg
(2) 723.5kg of distilled water
(3) Basic mordant 20% aqueous solution 150Kg
(4) Ammonium chloride 100% 1.0Kg
(5) p-Toluenesulfonic acid 100% 18Kg
(6) Surfactant (polyoxyethylene oleyl ether 10% solution) 100Kg
(7) Surfactant (Fluorosurfactant 10% solution) 3Kg
[First application / drying to second application / drying]
On the surface of the support 14 subjected to the corona discharge treatment, a color material receiving layer coating solution is applied at a coating amount of 180 g / m ² using a slide bead coating coater 40 to form a color material receiving layer (first Application step 16), and then dried by hot air dryer 42 at 60 ° C. (wind speed of 3 to 8 m / sec) until the solid content concentration of the colorant receiving layer reaches 20% (first drying step) 18). The colorant receiving layer showed a constant rate of drying during this period.

Immediately thereafter, 15 g of the basic coating solution having the above composition was applied to the support 14 by overcoating (PH 9.6) with a bar coater so that the amount became 50 g / m ^2, and after 10 seconds, the excess coating was scraped off with an air knife device. / M ² was left (second coating step 20). Then, the colorant receiving layer was completely dried at 80 ° C. by the hot air dryer 46. Thereby, an inkjet recording paper was manufactured.

In the production of such an ink jet recording paper, in the first coating step 16, the joining portion 36 of the support 14 joined by the adhesive tape 38 is passed through the slide bead coating coater 40 to apply and form a color material receiving layer. The first drying step 18 → the second coating step 20 → the second drying step 22 was passed.
(First embodiment)
In the first example, when the thickness of the adhesive tape 38 was made constant and the Hunter whiteness of the adhesive tape 38 was changed, the cracking of the tape coating layer was tested. The hunter whiteness of the support 14 is 88%.

  Test 1... Adhesive tape 38 having a thickness of 60 .mu.m was used with a tape substrate thickness of 50 .mu.m and an adhesive layer thickness of 10 .mu.m. Then, the rear end of the current support 14A and the front end of the new support 14B were butt-joined using an adhesive tape having a width of 50 mm. The hunter whiteness on the anti-adhesive surface side of the adhesive tape 38 was set to 80% white.

  Test 2—Same as Test 1 except that the color on the anti-adhesive surface side of the adhesive tape 38 was changed to a light gray color with a Hunter whiteness of 40%.

  Test 3—Same as Test 1 except that the color on the anti-adhesive surface side of the adhesive tape 38 was changed to brown having a Hunter whiteness of 20%.

  Test 4—Same as Test 1 except that the color on the anti-adhesive surface side of the adhesive tape 38 was darker brown than in Example 3 where the Hunter whiteness was 18%.

  Test 5: Same as Test 1 except that the color on the anti-adhesive surface side of the adhesive tape 38 was changed to a light black color with a Hunter whiteness of 10%.

  Test 6—Same as Test 1 except that the color on the anti-adhesive side of the adhesive tape 38 was black with a Hunter whiteness of 2%.

  The test results are shown in Table 1. In the evaluation of cracking of the tape coating layer in Table 1, ○ indicates that no cracking occurred in the tape coating layer, and Δ indicates that cracking of the tape coating layer was slightly observed, but there was no dropout of the membrane fragments, and × There are many cracks in the tape coating layer, and falling off of the membrane fragments is recognized, indicating failure.

表１の結果から分かるように、接着テープ３８の厚みを一定にして、接着テープ３８の反接着剤面側のハンター白色度を下げていくと、ハンター白色度が２０％を境にしてテープ塗布層の割れが多く発現し出した。即ち、支持体１４のハンター白色度が８８％のとき、接着テープ３８の反接着剤面側のハンター白色度が８０％の試験１、４０％の試験２では○の評価であり合格であった。また、２０％の試験３では△の評価であり、試験１〜３は全て合格であった。これに対し、接着テープ３８の反接着剤面側のハンター白色度が１８％の試験４では×の評価であり、１０％、２％の試験５及び６も×の評価であった。このことから、支持体１４のハンター白色度が８８％のとき、接着テープ３８の反接着剤面側のハンター白色度は２０％以上であることが必要であることが分かる。

As can be seen from the results in Table 1, when the thickness of the adhesive tape 38 is kept constant and the hunter whiteness on the anti-adhesive side of the adhesive tape 38 is decreased, the tape is applied with the hunter whiteness reaching 20% as a boundary. Many cracks of the layer began to appear. That is, when the hunter whiteness of the support 14 is 88%, the hunter whiteness on the anti-adhesive surface side of the adhesive tape 38 is 80%, and the test 2 is 40% and the test 2 is ◯. . In addition, 20% of Test 3 was evaluated as Δ, and Tests 1 to 3 were all passed. On the other hand, Test 4 in which the hunter whiteness on the anti-adhesive surface side of the adhesive tape 38 was 18% was evaluated as x, and Tests 5 and 6 of 10% and 2% were also evaluated as x. From this, it can be seen that when the hunter whiteness of the support 14 is 88%, the hunter whiteness on the anti-adhesive surface side of the adhesive tape 38 needs to be 20% or more.

In the first embodiment, after a color material receiving layer containing inorganic fine particles, a water-soluble resin and a crosslinking agent is applied and formed, a basic coating liquid is applied on the color material receiving layer in a dry state. In this example, the coloring material receiving layer is hardened, but after the coloring material receiving layer containing the inorganic fine particles and the water-soluble resin is applied and formed, a crosslinking agent is contained on the coloring material receiving layer in a dry state. The same result was obtained when the coloring material receiving layer was hardened by applying the solution.
(Second embodiment)
In the second example, the whiteness ratio on the anti-adhesive surface side of the adhesive tape 38 was made constant at 91%, and the tape coating layer was cracked when the thickness of the adhesive tape 38 was changed. It is.

  Test 7: The thickness of the adhesive tape 38 was reduced from 60 μm in Test 1 to 20 μm.

  Test 8: The thickness of the adhesive tape 38 was reduced from 60 μm in Test 1 to 30 μm.

  Test 9: The thickness of the adhesive tape 38 was reduced from 60 μm in Test 1 to 50 μm.

  Test 10: The thickness of the adhesive tape 38 was increased from 60 μm in Test 1 to 100 μm.

  Test 11: The thickness of the adhesive tape 38 was increased from 60 μm in Test 1 to 110 μm.

  Test 12: The thickness of the adhesive tape 38 was increased from 60 μm in Test 1 to 140 μm.

  The test results are shown in Table 2. The evaluation of cracks in the tape coating layer in Table 2 is the same as in the examples.

表２の結果から分かるように、接着テープ３８の反接着剤面側の白色度比率を一定にして、接着テープ３８の厚みを変えていくと、接着テープ３８の厚みが２０μｍと薄すぎると、支持体１４を搬送する張力により接着テープ３８が伸びて支持体１４の張力が不均一になって支持体１４に皺がよってしまった。この結果、この皺に起因してテープ塗布層に割れが発生した。また、接着テープ３８の厚みが３０μｍの試験８及び５０μｍの試験９はテープ塗布層の割れが全くなく良い結果であった。接着テープ３８の基材厚みを１００μｍまで厚くすると、支持体１４と接着テープ３８との段差部分でテープ塗布層に僅かに割れが見られたが、塗膜破片の脱落はなく、製品としては特に問題なかった。接着テープの基材厚みが１００μｍを超えた試験１１及び試験１２は、テープ塗布層に割れが見られた他、特に支持体１４と接着テープ３８の段差部分において塗布層の乱れによる割れが多く見られ、塗膜破片が脱落して工程汚染を引き起こした。この試験１１では、接着テープ３８の反接着剤面側の白色度比率は９１％で本発明を満足しているにも係わらず×の評価になったが、これは接着テープ３８の厚みが余りに厚過ぎるためにテープ塗布層が薄膜化し、このテープ塗布層厚みが律速になってテープ塗布層の乾燥が進み過ぎたものと考察される。このことから、接着テープ３８の基材厚みは、３０μｍ以上、１００μｍ以下にすることが必要である。

As can be seen from the results in Table 2, when the whiteness ratio on the anti-adhesive surface side of the adhesive tape 38 is made constant and the thickness of the adhesive tape 38 is changed, the thickness of the adhesive tape 38 is too thin as 20 μm. The adhesive tape 38 is stretched by the tension that conveys the support 14, and the tension of the support 14 becomes uneven, causing wrinkles on the support 14. As a result, cracks occurred in the tape coating layer due to the wrinkles. Further, Test 8 in which the thickness of the adhesive tape 38 was 30 μm and Test 9 in which the thickness of the adhesive tape 38 was 50 μm were good results with no cracks in the tape coating layer. When the base material thickness of the adhesive tape 38 was increased to 100 μm, the tape coating layer was slightly cracked at the stepped portion between the support 14 and the adhesive tape 38, but the coating film fragments were not dropped off, and the product was particularly There was no problem. In Test 11 and Test 12 in which the base material thickness of the adhesive tape exceeded 100 μm, cracks were observed in the tape coating layer, and in particular, there were many cracks due to the disturbance of the coating layer at the step portion of the support 14 and the adhesive tape 38. As a result, coating film fragments dropped off, causing process contamination. In this test 11, although the whiteness ratio on the anti-adhesive surface side of the adhesive tape 38 was 91% and the present invention was satisfied, it was evaluated as x, but this is because the thickness of the adhesive tape 38 is too large. It is considered that the thickness of the tape coating layer was reduced because the film was too thick, and the thickness of the tape coating layer became rate-determining, and the drying of the tape coating layer proceeded excessively. For this reason, the base material thickness of the adhesive tape 38 needs to be 30 μm or more and 100 μm or less.

The block diagram which showed the manufacturing line of the manufacturing method of the inkjet recording paper which is the best embodiment of the manufacturing method of the coating layer body of this invention It is a figure explaining the butt joining with the adhesive tape of the present support body and a new support body, (A) is a top view, (B) is a side view

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Manufacturing line of inkjet recording paper, 12 ... Delivery process, 14 ... Support body, 16 ... 1st application process, 18 ... 1st drying process, 20 ... 2nd application process, 22 ... 2nd drying process , 24 ... winding process, 26 ... turret device, 28 ... joining device, 30 ... dancer roller device, 32 ... adsorber, 34 ... joining machine, 36 ... joint of support, 38 ... adhesive tape, 40 ... slide bead Type coating coater, 42 ... divided zone type hot air dryer, 44 ... extrusion type coating coater

Claims (7)

An application step of applying a coating liquid on the support to form a coating layer while continuously transporting a belt-like support having a bonded portion bonded with an adhesive tape, and a drying step of drying the coating layer In a method for producing a coated layer body comprising at least
A method for producing a coating layer, wherein the thickness of the adhesive tape is 30 μm or more and 100 μm or less. An application step of applying a coating liquid on the support to form a coating layer while continuously transporting a belt-like support having a bonded portion bonded with an adhesive tape, and a drying step of drying the coating layer In the manufacturing method of the coating layer body provided with,
The method for producing a coated layer body, wherein when the support has a hunter whiteness of 80% or more, the hunter whiteness on the anti-adhesive surface side of the adhesive tape is 20% or more.   The method for producing a coated layer body according to claim 2, wherein the hunter whiteness of the support and the hunter whiteness of the adhesive tape on the side opposite to the adhesive surface are the same. An application process for forming a coating layer by applying a coating solution on the support while continuously transporting a support having a bonded portion bonded with an adhesive tape, and a drying process for drying the coating layer In the manufacturing method of the coating layer body provided at least,
When the substrate thickness of the adhesive tape is 30 μm or more and 100 μm or less and the hunter whiteness of the support is 80% or more, the hunter whiteness on the anti-adhesive surface side of the adhesive tape is 20% or more. A method for producing a coated layer body, characterized in that:   5. The coating solution according to claim 1, wherein the coating solution is a coating solution for forming a colorant receiving layer containing inorganic fine particles and a water-soluble resin, and the coating layer body is an ink jet recording sheet. The manufacturing method of 1 coating layer body.   6. The coating layer according to claim 5, wherein after the color material receiving layer is formed by coating, a solution containing a crosslinking agent is applied onto the color material receiving layer in a dry state to harden the color material receiving layer. Body manufacturing method.   The coating solution contains the inorganic fine particles, a water-soluble resin, and a crosslinking agent. After the color material receiving layer is formed by coating, a basic coating solution is applied onto the color material receiving layer in a dry state. 6. The method for producing a coated layer body according to claim 5, wherein the coloring material receiving layer is hardened.

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