JP2004018221A - Conveyance method and conveyance device for beltlike body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a conveyance method and a conveyance device for a beltlike body capable of preventing the occurrence of peeling and repetitive adhesion of a surface component in a manufacturing line for manufacturing the beltlike body with a covered layer continuously. <P>SOLUTION: In this conveyance method, the beltlike body forming the covered layer on at least one face is conveyed using a conveyance roller in contact with the covered layer, and surface temperature of the conveyance roller is adjusted to a specific scope for melting point or glass transition point of the surface component of the covered layer to bring it into contact with the conveyance roller. The conveyance device for the beltlike body is provided with the conveyance roller and a surface temperature adjusting means for adjusting surface temperature of the conveyance roller to the specific scope. <P>COPYRIGHT: (C)2004,JPO

Description

表１に示すように、搬送ローラ１２Ａの表面温度を前記クレゾールノボラック樹脂のガラス転移点である９５℃より１０℃低い８５℃に設定した実施例１および３、ならびに、前記ガラス転移点９５℃よりも２２℃高い１１７℃に設定した実施例２および４においては、得られたサーマルポジ型ＣＴＰ版の製版層表面に何らの故障も見られなかった。
【００９３】
しかし、搬送ローラ１２Ａの表面温度を前記ガラス転移点よりも５℃高い１００℃に設定した比較例１および２においては、得られたサーマルポジ型ＣＴＰ版の製版層の表面に、スジ状の表面成分剥離が見られた。このサーマルポジ型ＣＴＰ版をレーザ光で露光してアルカリ溶液で現像したところ、前記剥離が見られた箇所は過現像を起こし、白抜けが発生した。
【００９４】
（実施例５〜８、比較例３、４）
実施例１〜４と同様の手順に従って作製した支持体ウェブに、同様の下塗り処理を施した。
【００９５】
下塗り処理を施した支持体ウェブに、実施例１〜４で使用した製版層形成液にステアリン酸ドデシル０．３ｇを配合したものを、乾燥後の塗布量が１８ｍｇ／ｍ^２になるように塗布し、乾燥部４において９０℃で１分乾燥した。乾燥部４を通過した支持体ウェブを、搬送ローラ１２Ａの胴の表面の材質および温度を表１に示すように変化させて搬送し、故障の有無を調べた。結果を表２に示す。
前記製版層は［発明の実施の形態］のところで述べた製版層Ｄに相当する。
【００９６】
【表２】

表２に示すように、搬送ローラ１２Ａの表面温度を表面成分であるステアリン酸ドデシルの融点である３８℃より８℃低い３０℃に設定した実施例５および７、ならびに、前記融点３８℃よりも２０℃高い５８℃に設定した実施例６および８においては、得られたサーマルポジ型ＣＴＰ版の製版層表面に何らの故障も見られなかった。
【００９７】
しかし、搬送ローラ１２Ａの表面温度を前記融点よりも２℃高い４０℃に設定した比較例３および４においては、得られたサーマルポジ型ＣＴＰ版の製版層の表面に、ステアリン酸ドデシルが再転写して斑点状の故障が発生した。このサーマルポジ型ＣＴＰ版をレーザ光で露光してアルカリ溶液で現像したところ、前記個所は現像が進行せず、残膜が発生した。
【００９８】
【発明の効果】
以上説明したように、本発明によれば、被覆層付きの帯状体を連続製造する製造ラインにおいて、表面成分の剥離や再付着が発生することのない帯状体の搬送方法および搬送装置が提供される。
【図面の簡単な説明】
【図１】図１は、サーマルポジ型ＣＴＰ版の製造ラインの一部である製版層形成ラインに本発明の帯状体の搬送方法を適用した例を示す概略図である。
【符号の説明】
２　　　バーコータ
４　　　乾燥部
６　　　表面温度調整部
８　　　表面温度計
１０　　　制御装置
１２　　　搬送ローラ
１２Ａ　　搬送ローラ
１４　　　表面温度計
１６　　　表面温度制御装置[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method and apparatus for transporting a belt-like body, and in particular, when a coating layer covering the surface of the belt-like body comes into contact with the transport roller, the surface component of the coating layer does not adhere to the transport roller. The present invention relates to a belt-like body transport method and a transport apparatus.
[0002]
[Prior art]
In recent years, CTP plates that directly write a print image on a plate making layer by laser light based on an image signal from a computer have been widely used.
[0003]
The CTP plate includes a thermal mode type CTP plate that uses laser light in the near infrared region and a photon mode type CTP plate that uses laser light in the visible light region.
[0004]
As the thermal mode type CTP plate, a thermal negative type CTP plate in which a portion exposed to laser light is insolubilized to form a printed image and a thermal positive type in which a portion irradiated with laser light is solubilized to form a printed image. The CTP version is generally used.
[0005]
The thermal positive type CTP plate is usually formed on a roughened surface of an aluminum web, which is a continuous strip-shaped aluminum thin plate, an alkali-soluble binder resin that is insoluble in water and soluble in an alkali solution, such as a novolak resin, and carbon black or cyanine. A plate making containing an infrared absorber that generates heat by absorbing laser light such as a dye or a phthalocyanine pigment, and an alkali dissolution inhibitor that prevents the alkali-soluble binder resin from dissolving in an alkaline solution, such as an onium salt or a quinonediazide compound. It has the structure which provided the layer. It is also widely practiced to mix various wax components into the plate making layer so that the surface of the plate making layer is not damaged during transportation or handling.
[0006]
The plate-making layer is a plate-making layer formed by dissolving or suspending the alkali-soluble binder resin, the infrared absorber, and the alkali dissolution inhibitor in an appropriate organic solvent, and blending the wax component and other components as necessary. In general, the liquid is applied to the roughened surface of the support web and dried by heating.
[0007]
Therefore, at the time of forming the plate making layer, the novolak resin and the wax component mixed in the plate making layer forming solution are separated and deposited, and a layer of the novolak resin and the wax component is formed on the surface of the plate making layer.
[0008]
Here, the application and drying of the plate making layer forming liquid are generally performed by continuously running the support web in a certain direction. Therefore, the production line of the thermal positive type CTP plate is provided with a number of conveyance rollers for conveying the support web.
[0009]
[Problems to be solved by the invention]
However, for the sake of compacting the production line, at least a part of the transport roller was formed by drying the plate-making layer forming liquid layer applied to the support web and the plate-making layer forming liquid layer. In many cases, it must be disposed so as to be in contact with the plate making layer.
[0010]
In such a production line, the novolak resin or wax component deposited on the surface of the plate making layer is peeled off and transferred to the conveyance roller, or the novolak resin or wax component transferred to the conveyance roller is reattached to the plate making layer. There was something to do. When the novolac resin or the wax component is transferred to the transport roller, the resulting thermal positive CTP plate causes over-development and white spots caused by it. Further, when the novolak resin or wax component transferred to the transport roller is reattached to the plate making layer, a residual film is generated in the thermal positive type CTP plate.
[0011]
In a production line for continuously producing a strip with a coating layer such as a thermal positive type CTP plate, the present invention provides a strip that does not cause separation or reattachment of the surface components such as the novolak resin and the wax component. An object is to provide a transport method and a transport apparatus.
[0012]
[Means for Solving the Problems]
The invention described in claim 1 has a coating layer on at least one surface, a belt-like body having a glass transition point as a surface component of the coating layer, a conveyance roller, and the conveyance roller in contact with the coating layer A method for transporting a belt-shaped body that is transported by adjusting the surface temperature of the transport roller to the glass transition point of −10 ° C. or lower, or the glass transition point of + 20 ° C. or higher. About.
[0013]
In the method for transporting the belt-like body, the surface component is transported when the belt-like body having a glass transition point deposited on the coating layer is transported by adjusting the surface temperature of the transport roller to the above range. Transfer to the cylinder of the roller is prevented.
[0014]
Examples of the strip include a lithographic printing plate, and more specifically, a thermal positive type CTP plate described in the column of [Prior Art] and a photon mode type CTP plate.
[0015]
Specifically, the photon mode type CTP plate is formed by forming a photopolymerizable layer containing a photopolymerizable oligomer and a photopolymerizable monomer on a roughened surface of a support web, and PVA (polyvinyl alcohol) thereon. In which an oxygen barrier layer mainly composed of is formed.
[0016]
Other examples of the belt-like body include magnetic recording materials such as audio tapes and video tapes, and magnetic recording materials having a lubricating layer on the surface such as floppy (R) disks.
[0017]
The coating layer is a layer that covers the surface of the belt-like body, and specifically includes a plate making layer in the lithographic printing plate and a magnetic recording layer in the magnetic recording material.
[0018]
The surface component is a component present on the surface of the coating layer, and in particular, a component that covers the surface of the coating layer in a layered manner.
[0019]
Examples of the surface component having a glass transition point include an alkali-soluble binder resin such as a novolak resin deposited on the surface of the plate-making layer in a thermal positive CTP plate in which no wax component is blended in the plate-making layer, and the photon mode. PVA in the oxygen barrier layer of the type CTP plate.
[0020]
The invention according to claim 2 has a belt-like body having a coating layer on at least one surface, and a surface component of the coating layer having a melting point, using a conveyance roller, and bringing the conveyance roller into contact with the coating layer. A method for transporting a belt-shaped body to be transported, wherein the surface temperature of the transport roller is adjusted to the melting point −8 ° C. or lower or the melting point + 20 ° C. or higher.
[0021]
According to the method for transporting the belt-shaped body, the surface component of the transport roller is adjusted when the surface temperature of the coating layer is transported by adjusting the surface temperature of the transport roller to the range. Transfer to the cylinder is prevented.
[0022]
The strip and the covering layer are as described in claim 1.
[0023]
Examples of the surface component having a melting point include a wax component blended in the plate making layer of the thermal positive type CTP plate, and a lubricant that forms a lubricating layer of the magnetic recording material.
[0024]
The invention described in claim 3 relates to a method for transporting a band-shaped body in which the band-shaped body is a support web that is a base material of a lithographic printing plate, and the coating layer is a plate-making layer of the lithographic printing plate.
[0025]
The transport method is an example in which the transport method of the belt according to claim 1 or 2 is applied to transport a support web or a lithographic printing plate in a lithographic printing plate production line.
[0026]
According to the transport method, the surface component of the plate making layer is prevented from being transferred to the transport roller and causing various failures.
[0027]
The invention described in claim 4 relates to a method for transporting a belt-like body in which the plate making layer is heat sensitive.
[0028]
The transport method is an example in which the transport method of the belt according to the present invention is applied to a production line of a lithographic printing plate having a heat sensitive plate making layer like a thermal mode type CTP plate.
[0029]
According to the transport method, it is possible to prevent various surface failures from occurring due to surface components adhering to the surface of the transport roller in a lithographic printing plate production line having a thermosensitive plate-making layer.
[0030]
The invention according to claim 5 relates to a transport method in which the coating layer is a heat-sensitive plate making layer, and the surface component of the coating layer is a novolak resin formed in the plate making layer.
[0031]
The transport method is an example in which the transport method of the present invention is applied in the manufacture of a thermal positive CTP plate.
[0032]
According to the transport method, in the production line of the thermal positive type CTP plate, novolak resin deposited on the surface of the plate making layer is not transferred to the transport roller. It is prevented from occurring on the surface.
[0033]
The invention according to claim 6 relates to a conveying method in which the coating layer is a heat-sensitive plate making layer and the surface component of the coating layer is a wax component blended in the plate making layer.
[0034]
According to the transport method, in the production line of the thermal positive type CTP plate, the wax component deposited on the surface of the plate making layer is not transferred to the transport roller. It is generated on the surface of the plate making layer of the mold CTP plate, and a residual film is generated due to the adhering portion, thereby preventing background contamination.
[0035]
The invention described in claim 7 is a belt-shaped body transporting device that transports a belt-shaped body that has a coating layer on at least one surface and the surface component of the coating layer has a glass transition point. A conveyance roller that contacts and conveys the belt-like body, and a surface temperature adjusting unit that adjusts the surface temperature of the conveyance roller to the glass transition point of −10 ° C. or lower or the glass transition point of + 20 ° C. or higher. The present invention relates to a belt-like body conveyance device.
[0036]
According to the transport device, when the surface component of the coating layer has a glass transition point, the surface component is not transferred to the surface of the transport roller, and thus various failures caused by the transfer are prevented. Can do.
[0037]
The strip, the coating layer, and the surface components are as described in claim 1.
[0038]
The invention according to claim 8 is a belt-shaped body transporting device that transports a belt-shaped body having a coating layer on at least one surface and having a melting point as a surface component of the coating layer, and is in contact with the coating layer. A transport roller for transporting the belt-like body, and a surface temperature adjusting means for adjusting the surface temperature of the transport roller to the melting point −8 ° C. or lower, or the melting point + 20 ° C. or higher. The present invention relates to a belt-like body conveying apparatus.
[0039]
According to the transport device, when the surface component of the coating layer has a melting point, the transfer of the surface component to the surface of the transport roller does not occur.
[0040]
The band and the surface component are as described in the second aspect.
[0041]
The invention according to claim 9 relates to a belt-like material transport device in which the strip is a support web that is a base material of a lithographic printing plate, and the coating layer is a plate-making layer of the lithographic printing plate.
[0042]
The belt-like body conveyance device is an example in which the conveyance device according to claim 5 or 6 is applied to a lithographic printing plate production line.
[0043]
According to the transport device, the surface component of the plate making layer is prevented from being transferred to the transport roller. Therefore, in the planographic printing plate obtained as a product, the surface layer is peeled off to cause over-development. The transferred surface component does not adhere again to hinder development and no residual film is formed.
[0044]
DETAILED DESCRIPTION OF THE INVENTION
1. Embodiment 1
FIG. 1 shows an example in which the belt-like material transport method of the present invention is applied to a plate making layer forming line which is a part of a production line for a thermal positive type CTP plate.
[0045]
As shown in FIG. 1, a plate making layer forming line 100 according to Embodiment 1 is a plate making layer forming line for producing a thermal positive type CTP plate by forming a plate making layer on a roughened surface of a support web W. , A group of transport rollers 12 and 12A for transporting the support web W in the direction of arrow a, and a plate-making layer forming liquid on the roughened surface of the support web W, which is located on the most upstream side with respect to the transport direction a. Bar coater 2 to be applied, located on the downstream side of bar coater 2, drying unit 4 for heating and drying the plate-making layer forming liquid applied by bar coater 2 to form a plate-making layer, and downstream of drying unit 4, And a surface temperature adjusting unit 6 for adjusting the surface temperature of the plate making layer formed in the drying unit 4.
[0046]
As the surface temperature adjusting unit 6, a cold air / hot air spraying device that cools or heats the plate-making layer by blowing cold air or hot air on both surfaces of the support web W, and the surface of the cylinder is maintained at a predetermined temperature, Examples include a temperature control roller that adjusts the temperature of the support web W within a predetermined range by contacting the surface of the support web W opposite to the side on which the plate-making layer is formed.
[0047]
A surface thermometer 8 for measuring the surface temperature of the plate making layer is provided on the downstream side of the surface temperature adjusting unit 6 adjacent to the surface temperature adjusting unit 6. The plate making layer forming line 100 is further provided with a control device 10 for controlling the surface temperature adjusting unit 6, and the surface thermometer 8 is connected to the control device 10.
[0048]
As the transport rollers 12 and 12A, in addition to those having a metal cylinder, those having a cylinder covered with rubber such as NBR or EPDM can be used. A heating / cooling device (not shown) for heating and cooling the surface of the cylinder is provided inside the conveying roller 12A on the side in contact with the plate making layer of the thermal positive type CTP plate. Examples of the heating / cooling device include cooling water having a predetermined water temperature or a heating / cooling conduit for heating or cooling the conveying roller 12A by circulating hot water.
[0049]
In the vicinity of the transport roller 12A, there are a surface thermometer 14 for measuring the surface temperature of the transport roller 12A, and a surface temperature control device 16 for controlling the heating and cooling device based on the surface temperature measured by the surface thermometer 14. Is provided.
[0050]
The transport rollers 12 and 12A correspond to the transport roller in the belt-shaped body transport device according to the present invention, and the surface thermometer 14, the surface temperature adjusting device 16, and the heating and cooling device correspond to the surface temperature adjusting means in the transport device. To do.
[0051]
When transporting a thermal positive CTP plate in which a surface component having a glass transition point, such as a novolak resin, is deposited on the surface of the plate-making layer, the surface temperature of the plate-making layer and the cylinder of the carrying roller 12A is the glass transition temperature. It is controlled so as to be in the range of the point −10 ° C. or lower or the glass transition point + 20 ° C. or higher. When a thermal positive type CTP plate having a surface component having a melting point, such as waxes, deposited on the surface of the plate making layer is transported, the surface temperature of the cylinder of the transport roller 12A is the melting point −8 ° C. or lower, or The melting point is controlled to be in the range of + 20 ° C. or higher.
[0052]
The surface temperature adjustment unit 6 is feedback-controlled by the control device 10 based on the surface temperature input from the surface thermometer 8. The heating / cooling device is feedback-controlled by the surface temperature control device 16 based on the input from the surface thermometer 14.
[0053]
As the plate making layer of the thermal positive type CTP plate, specifically,
A, a plate making layer containing an alkali-soluble binder resin, an infrared absorber and an alkali dissolution inhibitor,
B. A material obtained by adding a wax component to the plate making layer A,
C. A plate making layer containing a novolac resin, the infrared absorber and an alkali dissolution inhibiting polymer,
D. A plate-making layer C added with the wax component
Is mentioned.
[0054]
[Plate making layer A]
The alkali-soluble binder resin used in the plate-making layer A is a resin that is insoluble in water and soluble in an alkaline solution as described in [Prior Art]. Specifically, in addition to a novolac resin, a sulfonamide group or Examples thereof include a sulfonamide group-containing polymer having a substituted sulfonamide group.
[0055]
Examples of the sulfonamide group-containing polymer include homopolymers and copolymers of monomers selected from N- (p-toluenesulfonyl) (meth) acrylamide and N- (p-phenyl) (meth) acrylamide. .
[0056]
Examples of the infrared absorber include carbon black, cyanine dye, and phthalocyanine pigment described in [Prior Art].
[0057]
The alkali dissolution inhibitor exhibits an alkali dissolution inhibitory ability, which is an ability to interact with an alkali-soluble binder resin and prevent the alkali-soluble binder resin from dissolving in an alkali solution at room temperature, but decomposes when heated. And a compound that loses the ability to inhibit alkali dissolution. Specific examples include onium salts and quinonediazide compounds described in [Prior Art].
[0058]
Examples of the onium salts include diazonium salts, ammonium salts, phosphonium salts, and iodonium salts.
[0059]
Examples of the quinonediazide compound include an o-quinonediazide compound.
[0060]
Examples of the plate making layer A include those containing a novolak resin, a diazonium salt and a cyanine dye as main components, and those containing a novolac resin, a diazonium salt, a sulfonamide group-containing polymer and a cyanine dye.
[0061]
[Plate making layer B]
Examples of the wax component that can be blended in the plate making layer B include higher fatty acid esters, fatty acid amides, higher alcohols, phthalic acid esters, petroleum waxes, and natural waxes.
[0062]
Examples of the higher fatty acid esters include alkyl esters of saturated or unsaturated fatty acids having 10 to 20 carbon atoms, cholesterol esters, glycol esters, triglycerides, and the like. Specific examples include myristic acid esters and palmitic acid. Examples thereof include esters, heptadecylate esters, and stearates.
[0063]
Examples of the phthalic acid esters include diethyl phthalic acid, dibutyl phthalic acid, dioctyl phthalic acid, ditridecyl phthalic acid, dicyclohexyl phthalic acid, dimethyl isophthalic acid, diphenyl phthalic acid, and dioctyl tetrahydrophthalate.
[0064]
Examples of petroleum waxes include paraffin wax, microcrystalline wax, and polyolefin wax.
[0065]
Examples of natural waxes include carnauba wax, montan wax, beeswax, and pine resin.
[0066]
As the plate making layer B,
-Containing novolak resin, diazonium salt, cyanine dye and stearic acid ester, containing novolak resin, diazonium salt, sulfonamide group-containing polymer, cyanine dye and stearic acid ester,
· Containing novolac resin, diazonium salt, cyanine dye and phthalate ester,
Containing novolac resin, diazonium salt, sulfonamide group-containing polymer, cyanine dye and phthalate, and
・ In these plate-making layers, petroleum wax or natural wax is blended instead of stearic acid ester or phthalic acid ester
Etc.
[0067]
[Plate making layer C]
The alkali dissolution inhibiting polymer that can be blended into the plate-making layer C is a polymer that interacts with the novolak resin at room temperature and exhibits alkali dissolution inhibiting ability, but loses the alkali dissolution inhibiting ability under heating. Examples thereof include polymers having at least one group selected from an amide group, an active imino group, and a phenolic hydroxyl group. As such a polymer, specifically,
(A) Homopolymers and copolymers of aminosulfonyl group-containing (meth) acrylic monomers such as m-aminosulfonylphenyl (meth) acrylate and N- (p-aminosulfonylphenyl) (meth) acrylamide,
(B) N- (p-toluenesulfonyl) (meth) acrylimide homopolymer and copolymer,
(C) Homopolymers and copolymers of hydroxy group-containing (meth) acrylic monomers such as N- (hydroxyphenyl) (meth) acrylamide and hydroxyphenyl (meth) acrylate
Etc.
[0068]
Examples of the infrared absorber that can be blended in the plate-making layer C include the infrared absorber described in the plate-making layer A.
[0069]
As the plate making layer C,
A blend of a novolak, a homopolymer or copolymer of an aminosulfonyl group-containing (meth) acrylic monomer, and a cyanine dye, and
・ A blend of novolak, a hydroxy group-containing (meth) acrylic monomer homopolymer or copolymer, and a cyanine dye
Etc.
[0070]
[Plate making layer D]
The wax components that can be blended in the plate making layer D are as described in the plate making layer B.
[0071]
When the thermal positive type CTP plate produced by the plate making layer forming line 100 has the plate making layer A or the plate making layer C, when the support web W coated with the plate making layer forming liquid is dried by the drying unit 4, A novolak resin is deposited on the surface.
[0072]
A novolac resin usually does not have a clear melting point, but has a glass transition point. The glass transition point can be measured by differential calorimetry.
[0073]
Therefore, the surface temperature of the plate-making layer immediately after passing through the surface temperature adjusting unit 6 and the surface temperature of the cylinder of the transport roller 12A are not more than the glass transition point Tg-10 ° C of the novolac resin, or not less than the Tg + 20 ° C. What is necessary is just to control the heating-cooling apparatus of the surface temperature adjustment part 6 and the conveyance roller 12A.
[0074]
When the plate-making layer A or the plate-making layer C contains two or more types of novolak resins having different glass transition points, the lowest Tg among the glass transition points Tg of the novolak resins. _lowest -10 ° C or lower, or highest Tg _highest It is preferable to control the surface temperature of the plate-making layer immediately after passing through the surface temperature adjusting unit 6 and the surface temperature of the cylinder of the conveying roller 12A so as to be + 20 ° C. or higher.
[0075]
On the other hand, when the thermal positive type CTP produced by the plate making layer forming line 100 has the plate making layer B or the plate making layer D, when the support web W coated with the plate making layer forming liquid is dried by the drying unit 4, the plate making layer The wax component is deposited on the surface of the film.
[0076]
Therefore, in the above case, the surface temperature of the platemaking layer immediately after passing through the surface temperature adjusting unit 6 and the surface temperature of the cylinder of the conveying roller 12A become the melting point Tm-8 ° C. or less of the wax component, or the Tm + 20 ° C. or more. Thus, the heating / cooling device for the surface temperature adjusting unit 6 and the transport roller 12A may be controlled.
[0077]
When the plate making layer B or the plate making layer D contains two or more kinds of wax components having different melting points, the lowest Tm among the melting points Tm of the wax components. _lowest −8 ° C. or lower, or the highest Tm _highest It is preferable to control the surface temperature of the plate-making layer immediately after passing through the surface temperature adjusting unit 6 and the surface temperature of the conveying roller 12A so as to be + 20 ° C. or higher.
[0078]
【Example】
(Examples 1-4, Comparative Examples 1 and 2)
(1) Production of support web
An aluminum web having a thickness of 0.3 mm is washed with trichlene and degreased, then subjected to mechanical surface roughening by rubbing with a roller nylon brush using pumice stone as an abrasive, and then 25% at a liquid temperature of 45 ° C. An alkali etching treatment was performed using a caustic soda solution. The aluminum web subjected to the alkali etching treatment was washed with nitric acid and desmutted, and a direct current was applied in a sulfuric acid solution to perform anodization to form an anodized film on the grained surface.
[0079]
(2) Formation of undercoat layer
On the grained surface of the support web formed by the above procedure, the following composition:
・ Β-Alanine 0.50g
・ Methanol 95g
・ Water 5g
The undercoat layer coating liquid A was applied and 0.68 seconds later, the following composition:
・ Β-Alanine 0.1g
・ Phenylphosphonic acid 0.05g
・ Methanol 40g
・ Water 60g
Undercoat layer coating solution B was applied and dried at 90 ° C. for 1 minute. The coating amount of the undercoat layer after drying is 18.6 mg / m ² Met.
[0080]
(3) Formation of plate making layer
Using the plate making layer forming line 100 shown in FIG. 1, the following plate making layer forming liquid has a coating amount of 18 mg / m after drying. ² And dried at 90 ° C. for 1 minute to form a plate making layer. The support web that passed through the drying unit 4 was conveyed while changing the material and temperature of the surface of the cylinder of the conveying roller 12A as shown in Table 1, and the presence or absence of a failure was examined. The results are shown in Table 1.
The plate making layer corresponds to the plate making layer C described in the [Embodiment of the Invention].
[0081]
The composition of the plate making layer forming liquid is as shown below.
[0082]
-Copolymer P 0.75g
-Cresol novolac resin (glass transition point 95 ° C) 0.25g
・ Infrared absorber (IR5-1) 0.20g
・ Tetrahydrophthalic anhydride 0.03g
0.015 g of a dye obtained by replacing the counter anion of Victoria Pure Blue BOH with a 1-naphthalenesulfonic acid anion
・ Fluorine-based surfactant (Megafac F-177 Dainippon Ink and Chemicals) 0.05g
・ Γ-Butyrolactone 10g
・ Methyl ethyl ketone 10g
1 g of 1-methoxy-2-propanol.
[0083]
The cresol novolac resin, the copolymer P, and the infrared absorber (IR5-1) correspond to the novolak resin, the alkali dissolution inhibiting polymer, and the infrared absorber in the plate making layer C, respectively.
[0084]
The copolymer P was synthesized by the following procedure.
[0085]
A 500 ml three-necked flask equipped with a stirrer, a condenser, and a dropping funnel was charged with 31.0 g (0.36 mol) of methacrylic acid, 39.1 g (0.36 mol) of ethyl chloroformate and 200 ml of acetonitrile, and an ice water bath The mixture was stirred while cooling at. While stirring the mixture, 36.4 g (0.36 mol) of triethylamine was added dropwise using the dropping funnel over about 1 hour. After completion of the dropwise addition, the ice water bath was removed, and stirring was continued at room temperature for 30 minutes.
[0086]
To the resulting reaction mixture, 51.7 g (0.30 mol) of p-aminobenzenesulfonamide was added and stirred for 1 hour while warming to 70 ° C. in a hot water bath.
[0087]
After stirring, the resulting mixture is filtered to take out a precipitate. To this, 500 ml of water is added to form a slurry, and the solid obtained by filtering the slurry is dried to give N- (p-aminosulfonyl) methacrylamide. Of a white solid was obtained.
[0088]
Next, in a 100 ml three-necked flask equipped with a stirrer, a condenser tube, and a dropping funnel, 5.04 g (0.0210 mol) of N- (p-aminosulfonyl) methacrylamide synthesized in the above procedure, ethyl methacrylate 2 .05 g (0.0180 mol), 1.11 g (0.021 mol) of acrylonitrile, and 20 g of N, N-dimethylacetamide were charged and stirred while heating to 65 ° C. in a hot water bath.
[0089]
To the resulting mixture, 0.15 g of 2,2′-azobis (2,4-dimethylvaleronitrile) (trade name: V-65, manufactured by Wako Pure Chemical Industries, Ltd.) was added as a radical polymerization initiator, and 65 ° C. The mixture was stirred for 2 hours under a nitrogen stream.
[0090]
The reaction mixture was further mixed with 5.04 g of N- (p-aminosulfonylphenyl) methacrylamide, 2.05 g of ethyl methacrylate, 1.11 g of acrylonitrile, 20 g of N, N-dimethylacetamide, and the above “V-65” 0. .15 g of the mixture was added dropwise from the dropping funnel over 2 hours.
[0091]
After completion of the reaction, 40 g of methanol was added to the mixture, cooled, poured into 2 liters of water and stirred for 30 minutes, and copolymer P was collected by filtration. The end of copolymer P was 15 g, and the weight average molecular weight measured by gel permeation chromatography was 53,000.
[0092]
[Table 1]

As shown in Table 1, Examples 1 and 3 in which the surface temperature of the transport roller 12A was set to 85 ° C., which is 10 ° C. lower than the glass transition point of the cresol novolak resin, and from the glass transition point 95 ° C. In Examples 2 and 4 where the temperature was set to 117 ° C. which was 22 ° C. higher, no failure was observed on the surface of the plate making layer of the obtained thermal positive CTP plate.
[0093]
However, in Comparative Examples 1 and 2 in which the surface temperature of the conveying roller 12A is set to 100 ° C., which is 5 ° C. higher than the glass transition point, the surface of the plate making layer of the obtained thermal positive type CTP plate has a streaky surface. Component peeling was observed. When this thermal positive type CTP plate was exposed to a laser beam and developed with an alkaline solution, the portion where the peeling was observed caused overdevelopment and white spots were generated.
[0094]
(Examples 5 to 8, Comparative Examples 3 and 4)
The same undercoating treatment was applied to the support web produced according to the same procedure as in Examples 1 to 4.
[0095]
A substrate web subjected to undercoating treatment, in which 0.3 g of dodecyl stearate is blended with the plate making layer forming liquid used in Examples 1 to 4, the coating amount after drying is 18 mg / m. ² And dried in a drying unit 4 at 90 ° C. for 1 minute. The support web that passed through the drying unit 4 was conveyed while changing the material and temperature of the surface of the cylinder of the conveying roller 12A as shown in Table 1, and the presence or absence of a failure was examined. The results are shown in Table 2.
The plate making layer corresponds to the plate making layer D described in the [Embodiment of the Invention].
[0096]
[Table 2]

As shown in Table 2, Examples 5 and 7 in which the surface temperature of the conveying roller 12A was set to 30 ° C., which is 8 ° C. lower than the melting point of dodecyl stearate as the surface component, and the melting point of 38 ° C. In Examples 6 and 8 set to 20 ° C. and 58 ° C., no failure was observed on the surface of the plate making layer of the obtained thermal positive type CTP plate.
[0097]
However, in Comparative Examples 3 and 4 in which the surface temperature of the conveying roller 12A is set to 40 ° C. which is 2 ° C. higher than the melting point, dodecyl stearate is retransferred onto the surface of the plate making layer of the obtained thermal positive type CTP plate A spot-like failure occurred. When this thermal positive type CTP plate was exposed with a laser beam and developed with an alkaline solution, the development did not proceed at this location, and a residual film was generated.
[0098]
【The invention's effect】
As described above, according to the present invention, in a production line for continuously producing a strip with a coating layer, a strip transport method and a transport device that do not cause separation or reattachment of surface components are provided. The
[Brief description of the drawings]
FIG. 1 is a schematic view showing an example in which a method for transporting a strip according to the present invention is applied to a plate making layer forming line which is a part of a production line for a thermal positive type CTP plate.
[Explanation of symbols]
2 Bar coater
4 Drying section
6 Surface temperature adjuster
8 Surface thermometer
10 Control device
12 Transport roller
12A Transport roller
14 Surface thermometer
16 Surface temperature control device

Claims (9)

A method for transporting a belt-shaped body having a coating layer on at least one surface and having a surface component of the coating layer having a glass transition point using a transport roller and bringing the transport roller into contact with the coating layer Because
A method of transporting a belt-like body, wherein the surface temperature of the transport roller is adjusted to the glass transition point −10 ° C. or lower, or the glass transition point + 20 ° C. or higher. A method for transporting a belt-shaped body having a coating layer on at least one surface and having a surface component of the coating layer having a melting point using a transport roller and bringing the transport roller into contact with the coating layer. And
A method for transporting a belt-like body, wherein the surface temperature of the transport roller is adjusted to the melting point −8 ° C. or lower, or the melting point + 20 ° C. or higher. The method for conveying a belt according to claim 1 or 2, wherein the belt is a support web which is a base material of a lithographic printing plate, and the coating layer is a plate making layer of the lithographic printing plate. The method for conveying a strip according to claim 3, wherein the plate making layer is heat sensitive. The transport method according to claim 1, wherein the coating layer is a heat-sensitive plate making layer, and a surface component of the coating layer is a novolak resin blended in the plate making layer. The transport method according to claim 2, wherein the coating layer is a heat-sensitive plate making layer, and the surface component of the coating layer is a wax component blended in the plate making layer. A belt-shaped body transporting device that transports a belt-shaped body having a coating layer on at least one surface and a surface component of the coating layer having a glass transition point,
A transport roller that contacts the coating layer and transports the belt-shaped body;
A belt-shaped body conveying apparatus comprising: a surface temperature adjusting means for adjusting a surface temperature of the conveying roller to the glass transition point of −10 ° C. or lower or the glass transition point of + 20 ° C. or higher. A belt-shaped body transport device that transports a belt-shaped body having a coating layer on at least one surface and having a melting point as a surface component of the coating layer,
A transport roller that contacts the coating layer and transports the belt-shaped body;
A belt-shaped body conveying apparatus comprising: a surface temperature adjusting means for adjusting a surface temperature of the conveying roller to the melting point of −8 ° C. or lower or the melting point of + 20 ° C. or higher. The belt-like body transport device according to claim 7 or 8, wherein the belt-like body is a support web that is a base material of a lithographic printing plate, and the coating layer is a plate-making layer of the lithographic printing plate.

Images