JP2001022092A - Automatic developing machine for photosensitive planographic printing plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make the rubbing quantity by bristle materials at the time of brushing equal and to make the removal of unnecessary photosensitive material layers by brushing uniform in the removal of the photosensitive layers of photosensitive planographic printing plates. SOLUTION: If the pressing force exerted on a photopolymer plate 102 from a brushing member 142 is assumed to be constant across a transverse direction, the largest pressing force is exerted at the central part in the transverse direction of the photopolymer plate 102 by the influence of the arcuate shape of the front surface part 144A of a receiving member 144. The curving of the brushing member 142 to an outer side is, however, resulted at the time of applying the pressing force and the pressing force is smallest in the central part of the transverse direction of the photopolymer plate 102. If such things are coordinated, the differences in the pressing force are offset and eventually the uniform pressing force may be exerted over the entire area in the transverse direction of the photopolymer plate 102.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for treating a photosensitive lithographic printing plate by brushing a photosensitive layer of the photosensitive lithographic printing plate with a brush member under a processing solution while the photosensitive lithographic printing plate is being transported. The present invention relates to an automatic developing machine for a photosensitive lithographic printing plate which promotes lithography.

[0002]

2. Description of the Related Art In a photosensitive lithographic printing plate, a photosensitive layer superposed on an aluminum plate as a support is exposed to light to form a light-receiving portion and a non-light-receiving portion. An image is formed by removing the photosensitive layer.

During the processing with the developing solution, the photosensitive layer is brushed with a brush roller while the photosensitive lithographic printing plate is immersed in the developing solution to remove unnecessary photosensitive layers. Thereby, a detailed image can be formed.

Here, as the conventional brush roller, a channel brush roller or a Molton roller is applied.

[0005] The channel brush roller is formed by winding a channel in which brush bristles, which are bristle materials, are wound around a hard roller serving as a core material, and is excellent in durability. Since unevenness is likely to occur, a complicated mechanism for rotating the channel brush roller itself while reciprocating in the axial direction is required.

[0006] In the channel brush roller, it is difficult to plant the brush bristles at a uniform density and at an angle. In the case of a roller shape, the brush bristles are lengthened to some extent in order to fill gaps between the channels when the channels are wound. It is not possible to shorten the length of the bristles and increase the stiffness of the bristles. In addition, if the brush hairs are thickened and the waist is strengthened, the finish is poor and brushing unevenness is likely to occur.

On the other hand, since the Molton roller has a brushing function on the peripheral surface of the roller itself, the brushing unevenness is slightly better than the channel brush roller, but cannot be completely satisfactory. In addition, there is a drawback that there is no durability and the life is short.

Further, when pressure is applied to a part of the peripheral surface of the Moulton roller, the part is deformed, causing a difference in pressure rubbing the plate surface, leading to unevenness during brushing. Also,
The material usually used for Molton rollers wears quickly.

In particular, when a photopolymer layer is used as a photosensitive layer, such as a photopolymer plate, which is a type of photosensitive lithographic printing plate, it is necessary to rub strongly. The defect is noticeable. If the hair tips are strongly applied to strongly rub the photopolymer layer of the photopolymer plate, the hair will bend, and the unnecessary photopolymer layer cannot be removed properly, and the brush roller cannot perform its original function. .

If the width of the photosensitive lithographic printing plate is large (for example, about 600 to 1300 mm), the channel lithographic printing plate can be supported by both ends thereof and pressed against the photosensitive lithographic printing plate. The axis of the brush roller or Molton roller curves outward near the center, and the pressing force at the center in the axial direction is lower than at both ends, resulting in a difference in the amount of rubbing of the photopolymer layer during brushing. There is.

[0011]

SUMMARY OF THE INVENTION In consideration of the above facts, the present invention makes it possible to make the amount of rubbing by the bristle material uniform during the removal of the photosensitive layer of the photosensitive lithographic printing plate. An object of the present invention is to provide an automatic developing machine for a photosensitive lithographic printing plate capable of uniformly removing an unnecessary photosensitive layer.

[0012]

The invention according to claim 1 is an automatic developing machine for a photosensitive lithographic printing plate which processes a photosensitive lithographic printing plate with a processing solution while transporting the photosensitive lithographic printing plate. A brush member comprising a brush body provided with a sheet material and a bristle material woven into the sheet material, and a brush member for brushing a photosensitive layer of the photosensitive lithographic printing plate under the processing solution to promote processing, and The photosensitive lithographic printing plate is disposed to face the brush member with the conveyance path of the photosensitive lithographic printing plate therebetween, and applies a pressing force from the brush member on the photosensitive lithographic printing plate to a widthwise central portion of the photosensitive lithographic printing plate. And a receiving member provided to be substantially the same at both ends in the width direction.

According to the first aspect of the present invention, the receiving surface of the photosensitive lithographic printing plate has a center portion in the width direction of the photosensitive lithographic printing plate most protruded in the direction of the brush member, for example, an arc shape. When a predetermined pressure is applied to the photosensitive lithographic printing plate by pressing both ends of the member in the longitudinal direction (width direction of the photosensitive lithographic printing plate) toward the member and applying a predetermined pressure to the photosensitive lithographic printing plate, the photosensitive lithographic plate caused by the curvature of the brush member. The pressure difference in the width direction of the printing plate is offset by the arc shape of the receiving member, and the pressing force of the brush member against the photosensitive lithographic printing plate by the bristle material is made uniform over the entire width of the photosensitive lithographic printing plate. it can.

Further, since the bristle material of the brush member is made by weaving the bristle material with the sheet material as the base material, the bristle material can be arranged at a high density. For example, a strong pressing force is applied to the photosensitive lithographic printing plate to perform brushing. However, it is possible to solve the problem that the hair material is slashed and proper brushing cannot be performed.

According to a second aspect of the present invention, in the first aspect of the present invention, the brush member is provided with a bristle material on a flat surface, and is provided in at least one of a conveying direction and a width direction of the photosensitive lithographic printing plate. The photosensitive lithographic printing plate is a planar brush that brushes by moving.

According to a third aspect of the present invention, in the first aspect of the present invention, the brush member is provided with a bristle material on a peripheral surface, and is a brush roller for brushing the photosensitive lithographic printing plate by rotation. It is characterized by:

[0017] If the relationship between the brush member and the receiving member is a uniform pressing force across the width of the photosensitive lithographic printing plate as in claim 1, the brush main body is mounted on the planar base member surface. Alternatively, it may be attached so as to be wound around the peripheral surface of the roller (see claim 3).

According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the material of the bristle material is a natural fiber or an artificial fiber, and the thickness of the bristle material is D is 1 to 10000 denier / piece, the length of the bristle is 1 to 35 mm, and the density P of the bristle formed as a band for brushing is P = 1000 to 20,000.
0 denier / cm ² (where P = D × the number of hairs per unit area (pieces / cm ² )).

According to a fifth aspect of the present invention, in the invention according to any one of the first to third aspects, the material of the bristle material is a metal fiber, and the wire diameter R of the bristle material is R. = 10
２００200 μm / piece, and the length of the bristle material is 1-30 m
m, and the density P of the bristle material formed as a band for brushing is P = 0.05 to 7.0 mm ² / cm ² .
(However, P is the cross-sectional area per hair material (mm ² / piece) × the number of hair materials per unit area (pieces / cm ² )).

According to the sixth and seventh aspects of the present invention, as a specific numerical value for obtaining the appropriate rigidity, when the material of the bristle material is a natural fiber or an artificial fiber, The thickness D of the material is D = 1 to 10000 denier / piece, the length of the bristle is 1 to 35 mm, and the density P of the bristle formed as a band for brushing is P = 100.
0 to 200,000 denier / cm ² (however, P = D ×
The number of hair materials per unit area (this is hair / cm ² ).

In this case, the thickness of the hair material (denier /
Book) and the length L (mm) of the bristle material is 1 ≦ L ≦
It is 7.5 × (logD + (2/3)).

When the bristle material is a metal fiber, the bristle material has a wire diameter R and the bristle length is 1 mm.
And the density P of the bristle material formed as a band for brushing is P = 0.05 to 7.0 mm ² / c.
m ² (where P = cross-sectional area per hair material (mm ² /
Book) × the number of bristle pieces per unit area (book / cm ² ). ).

In this case, the wire diameter R of the hair material (μm / piece)
And the length L (mm) of the bristle material is 1 ≦ L ≦ 0.1
R + 10.

The length L of the bristle means a length protruding from the surface of the base material as shown in FIG.

(Ration of numerical limitation) Hair material length Natural / artificial fiber: 1 ≦ L ≦ 7.5 × (logD + (2 /
3)) Metal fiber: When 1 ≦ L ≦ 0.1R + 10 L is 1 or less, the use period of the bristle material is shortened, and the bristle material cannot be used (it becomes unusable with a little wear). When L exceeds the value on the right side, the bristle of the bristle becomes weak and the rubbing effect is lost. Thickness of hair material Natural / artificial fiber: 1 to 10,000 denier / piece Hair wire diameter Metal fiber: 10 to 200 μm / piece As shown in FIG.
If the hair material does not exist and exceeds the upper limit value, the finished image quality deteriorates. Hair material density Natural / man-made fiber: 1000 to 200,000 denier / cm
² Metal fiber: 0.05 to 7.0 mm ² / cm ² If the lower limit is less than each, the rubbing effect cannot be obtained.
If it is not less than the upper limit, it is difficult to increase the density further in production.

If rubbing is the main focus, higher density is more advantageous, but if the stirring effect is involved, the density will be reduced in consideration of the balance with the rubbing effect.

[0027]

FIG. 1 is a schematic view of an automatic photosensitive lithographic printing plate developing machine 100 according to the present embodiment.

As shown in FIG. 2, the photopolymer plate 102 of the photosensitive lithographic printing plate has a photoadhering layer 105 and a photopolymerization layer 106 on an aluminum plate 104 as a support layer.
Is provided. An overcoat layer 108 is overlaid on the photopolymerization layer 106. That is, the photopolymer plate 102 is exposed to an image by laser light in a four-layer structure. Note that exposure of an image according to the present embodiment is performed by a setter that scans and writes a laser beam based on digital image information. Thereby, the polymerization reaction of the image portion of the photopolymerization layer is promoted.

The photopolymer plate 102 reaches the pre-heating unit 110 located at the left end in FIG. 1 after the above-mentioned exposure processing is completed.

In the preheating unit 110, the photopolymer plate 1
Two transport roller pairs 112 and 114 for holding and transporting the H.02 horizontally are provided, and a heater unit 116 is provided therebetween. A guide plate 118 is provided below the conveyance path of the photopolymer plate 102 so as to face the heater unit 116 so as to keep the distance between the heater surface of the heater unit 116 and the photopolymer plate 102 constant. .

By the heating by the heater unit 116, the degree of polymerization of the light receiving portion of the photopolymerization layer 106 of the photopolymer plate 102 is increased, and the printing durability required for printing is improved.

Downstream of the pre-heating unit 110 is a pre-water washing unit 1
20 is provided so that the prepolymerized photopolymer plate 102 is fed in a horizontal state.

The pre-water washing section 120 includes the photopolymer plate 1
Two transport roller pairs 122 and 124 for horizontally transporting the transport roller 02 are provided, and a brush member 126 is disposed above a transport path therebetween. Further, a spray pipe 128 is disposed slightly upstream of the brush member 126 so that water is discharged toward the transport path. Here, the spray pipe 12
8, water is discharged from the photopolymer plate 10 and the brush member 126 is rotating (counterclockwise rotation in FIG. 1).
2 is conveyed, the overcoat layer 108 on the uppermost layer of the photopolymer plate 102 becomes wet and the brush roller 11
6 removed.

That is, the photopolymer plate 102 reaches the developing section 130 in the next step with the overcoat layer 108 removed.

The developing section 130 is provided with a storage tank 132 in which a developing solution is stored. By immersing the photopolymer plate 102 in the developing solution, the non-light receiving portion of the photopolymer layer 106 swells. The non-light receiving part is removed.

In the vicinity of the photosensitive lithographic printing plate insertion port and the discharge port of the developing unit 130, a pair of transport rollers 134,
136 is provided, the transport roller pair 134 guides the photopolymer plate 102 to the storage tank 132, and the transport roller pair 136 has a role of guiding the photopolymer plate 102 to the rinsing unit 138 in the next step. I have.

A guide plate 140 is provided in the storage tank 132, and the photopolymer plate 102 is guided by the guide plate 140 and conveyed in a large arc. In the storage tank 132, a brush member 142 is provided above the transport path. Further, a receiving member 144 is provided below the conveyance path so as to face the brush member 142, and the photopolymer plate 102 is conveyed while being sandwiched between the brush member 142 and the receiving member 144. You.

For this reason, the brush member 142 is applied to the photopolymer layer 106 of the photopolymer plate 102 at a predetermined pressure, and the non-light receiving portion of the photopolymer layer 106 is removed by the rotation of the brush member 142. Unnecessary non-light receiving portions near the boundary between the light receiving portion and the non-light receiving portion also include the brush member 142.
Is reliably removed by brushing.

The rinsing section 138 includes the photopolymer plate 1
Two transport roller pairs 148 and 150 for holding and transporting the H.02 horizontally are provided, and spray pipes 152 and 154 are provided in the vertical direction of the transport path therebetween. Wash water is discharged from the spray pipes 152 and 154.

Here, when the photopolymer plate 102 is discharged from the developing unit 130 and reaches the rinsing unit 138, water is discharged from the spray pipes 152 and 154, and the front and back surfaces of the photosensitive lithographic printing plate 102 are cleaned. The washed photopolymer plate 102 is sent to the finisher unit 156 in the next step.

The finisher section 156 is provided with two transport roller pairs 158 and 160 for horizontally holding and transporting the photopolymer plate 102, and a spray pipe 162 above the transport path therebetween. Has been established. From the spray pipe 162, a finisher liquid (desensitizing liquid) is discharged.

Here, the finisher liquid is discharged from the spray pipe 162 while the photopolymer plate 102 is horizontally conveyed through the finisher section 156 to coat the image forming surface.

The above are the processing steps of the photopolymer plate 102, and the photopolymer plate 1 after these steps have been completed.
02 is dried in a drying unit (not shown), and all processes are completed.

Here, in the automatic developing machine 100, the brush members 126 and 142 are applied, and the detailed configuration of the brush members 126 and 142 will be described below with reference to FIG. Since the basis is the brush member 142 used in the developing unit 130, the brush member 142 for the developing unit 132 will be described as an example.

As shown in FIG. 3, the brush member 142
Is composed of a base member 164 and a brush main body 166 attached to the base member 164 with an adhesive.

The brush body 166 is connected to the base member 25.
The sheet material 200 is provided with a sheet material 200 stuck to one surface of the sheet material 0 and a bristle material 170 woven with a uniform density using the sheet material 200 as a base material.

As shown in FIG. 4A, the brush main body 166 holds the sheet material 200 so as to face the same, and has a bristle material 170 woven so as to extend over the sheet material.
In the present embodiment, a pile as a natural fiber or an artificial fiber material is applied to the bristle material 170. The hair material 17
0 may be metal as long as it is moderately thin. The hair agent 170 is not limited to natural fibers and artificial fibers, and may be a thin metal.

Here, the materials of the bristle material 170 are classified and listed. −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− Natural fiber Vegetable fiber, animal fiber artificial fiber artificial fiber nylon 6, Nylon 66, Nylon 6,10, Nylon 11 Polyamide Polyethylene Terephthalate, Polybutylene Terephthalate, etc. Polyester Polyacrylon Tolyl, Polyacrylic Alkyl, etc. Polyacrylic Polypropylene Polystyrene, etc. Metal Fiber Stainless Steel Brass, etc. − −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−

That is, after the hair material 170 is folded in tension, it is cut at the center of the hair material 170,
Prototype 17 of brush body 166 applied in the present embodiment
2 (see FIG. 4B) is completed. After attaching the prototype 172 to the base member 250, the bristle material 17 of the prototype 172 is attached.
The brush member 142 is completed by further charging the bristle material 166 so that the length of the brush member 166 is evenly adjusted (see FIG. 4C). Thereby, the bristle material 166 is provided on the base member 250 in a predetermined area (plane) at a predetermined density.
And it is in the state where the hairs were evenly implanted.

The specifications of the brush body 166 at this time are as shown in Table 1.

The brush body 166 formed as described above
Is attached to the surface of the base material 250 with an adhesive, so that the brush member 142 is completed, and the bristle material 17 is formed.
The bristle tips of No. 0 are arranged so as to interfere with the conveyance path of the photopolymer plate 102.

The brush member 142 is reciprocated in the width direction of the photosensitive lithographic printing 102 by the driving force of a driving unit (not shown). The reciprocating movement may be not limited to the width direction of the photopolymer plate 102 but may be reciprocating movement in the transport direction. The reciprocating movement is not limited to the reciprocating movement returning to the movement start location, but may be performed at a location different from the movement start location. Movement may be performed. The movement in the elliptical shape may be performed by using both the width direction and the transport direction.

In this state, when the photopolymer plate 102 is conveyed, the brush member 142 presses the photopolymer layer 106 at a predetermined pressure and rubs the photopolymer layer 106 by the reciprocating movement, and the non-light receiving portion Can be removed.

Here, as shown in FIG. 5, the receiving member 144 disposed opposite to the brush member 142 has an upper surface portion 144A as a receiving surface.
The center portion in the width direction protrudes most toward the brush member 142, and has an arcuate surface shape that gradually lowers toward both ends.

By disposing the receiving member 144 having the upper surface portion 144A having such an arc shape, when the photopolymer plate 102 is pressed with a constant pressing force while supporting both end portions of the brush member 142, The central portion of the brush member 142 curves in a direction away from the photopolymer plate 102. The difference in the pressing force in the width direction applied to the photopolymer plate 102 due to the curvature is offset by the upper surface portion 144A of the receiving member 144 having the arc shape, and as a result, the pressing force is uniform over the width direction of the photopolymer plate 102. It is possible to.

This embodiment will be described below.

The photosensitive lithographic printing plate (for example, photopolymer plate) 102 reaches the pre-heating unit 110 after the exposure processing by the laser beam is completed, and reaches the two heating roller pairs 11.
2 and 114, the heater unit 1
Heat is received from the 16 heater surfaces. At this time, since the distance between the heater surface and the photopolymer plate 102 is kept constant, uniform heating can be performed.

By the heating by the heater unit 116, the degree of polymerization of the light receiving portion of the photopolymerization layer 106 of the photopolymer plate 102 increases.

When the preheating is completed, the photopolymer plate 1
02 is sent to the pre-washing unit 120.

In the pre-water washing section 120, the photopolymer plate 1
While 02 is being conveyed to the two conveying roller pairs 122 and 124, water is discharged from the spray pipe 128, and the brush roller 126 rotates (counterclockwise rotation in FIG. 1). As a result, the uppermost overcoat layer 108 of the photopolymer plate 102 is wetted and removed by the brush roller 116.

The photopolymer plate 102 from which the overcoat layer 108 has been removed reaches the developing section 130. The photopolymer plate 102 is transported by the transport roller pair 134 and is immersed in the storage tank 132. In the storage tank 132, the conveyance is guided by the guide plate 140, and is conveyed in a large arc. In the storage tank 132, the photopolymer plate 102 includes a brush roller 142 and a receiving roller 14.
4 and 146 while being conveyed. For this reason, the brush roller 142 hits the photopolymer layer 106 of the photopolymer plate 102 with a predetermined pressure, and the non-light receiving portion of the photopolymer layer 106 is removed by the rotation of the brush roller 142. Note that the vicinity of the boundary between the light receiving portion and the non-light receiving portion is also reliably removed by brushing of the brush roller 142. Thereafter, the photopolymer plate 102 is sent to the rinsing unit 138 by the pair of conveying rollers 136.

In the rinsing section 138, the photopolymer plate 1
In No. 02, the front and back surfaces are washed with water discharged from the spray pipes 152 and 154 while being horizontally conveyed by the conveying roller pairs 148 and 150. The washed photopolymer plate 102 is sent to the finisher unit 156 in the next step.

In the finisher section 156, the image forming surface is coated with a finisher liquid which is horizontally conveyed by two conveying roller pairs 158 and 160 and discharged from the spray pipe 162, and is sent to the drying section.

Here, in the present embodiment, the pre-water washing section 12
0, a brush roller 126 applied to the developing unit 130,
142 has a structure different from a conventional channel brush roller or Molton roller.

That is, the brush body 166 composed of the bristle material 170 woven into the sheet material 200 is attached to one surface of the base member 250.

By weaving the bristle material 170 in the sheet material 200, the bristle material 170 can be woven at a uniform pitch of μm unit, and the unevenness of density generated by the channel brush roller is eliminated.

Since the bristle 170 can be arranged at a higher density, the rigidity is high and the photopolymer layer 1 of the photopolymer
Even when it is necessary to rub harder (higher pressure) than usual, such as 06, the bristle material 170 does not twist and the brushing function can be reliably exhibited.

As described above, in the present embodiment, the pre-water washing section 1
20, a brush member 126 applied to the developing unit 130,
Since the bristle material 142 is woven into the sheet material 250 and is attached to the flat base material 250, the bristle material 170 can be arranged tightly and evenly over a predetermined area, The photopolymer plate 102 using the photopolymer layer 106 as a photosensitive layer that needs to be rubbed can be coped with, and an unnecessary photopolymer layer can be removed, so that uneven brushing does not occur.

In the above description, the brush members 126, 14
Although the basic structure of the photopolymer plate 102 has been described, when the pre-washing process or the developing process is actually performed, the brush members 126 and 142 are held in the longitudinal direction (the width direction of the photopolymer plate 102).
Need to support both ends. When a predetermined pressure is applied to the photopolymerization layer 106 in this support state, the base member 250 bends in the vicinity of the center in the longitudinal direction to the opposite side to the photopolymerization layer 106, and in the vicinity of the widthwise center of the photopolymer plate 102. The pressure may be lower than at both ends in the width direction.

Therefore, the amount of rubbing is made uniform in the width direction of the photopolymer plate 102 by the following embodiment. This is not essential, and may not be required depending on the rigidity of the base member 250.

The amount of rubbing refers to the photopolymer plate 1
02 refers to the degree of scraping by brushing an arbitrary point (area). In addition, the uniform rubbing amount is a state in which the photopolymer layer 102 corresponding to the halftone dots remains uniformly on the plate after the photopolymer plate 102 having uniformly exposed halftone dots is subjected to a brushing treatment under a processing solution. Say

That is, if the pressing force applied from the brush member 142 to the photopolymer plate 102 is constant in the width direction, the upper surface portion 144 of the receiving member 144
Due to the influence of the circular arc shape of A, the photopolymer plate 102
The largest pressing force is applied to the central part in the width direction. But,
As described above, the brush member 142 is curved outward when a pressing force is applied, and the central portion in the width direction of the photopolymer plate 102 has the smallest pressing force. When these are combined, the difference in the pressing force is offset, and as a result, a uniform pressing force can be applied over the entire area of the photopolymer plate 102 in the width direction.

The receiving member 144 having the arc-shaped upper surface portion 144A as shown in FIG. 5 is difficult to process, and therefore, as shown in FIGS. A U-shaped channel member 300 and at least one relatively thick spacer 302 (0.5 mm) attached to the back surface (planar shape) of the channel member 300
Thick) and two relatively thin spacers 304 (0.2 mm thick) are prepared, a thicker spacer 302 is attached at an intermediate position, and a thinner spacer 304 is attached near both ends, and a thin rigid plate 306 is formed. By attaching from above the spacers 302 and 304, an arcuate surface shape may be formed. The shape of the chamfered portion 308 is not limited to the circular arc shape but may be formed near both ends as shown in FIG.

In the present embodiment, the bristle material 1
A brush member 142 in the form of a flat brush is used in which the brush 70 is disposed, but as shown in FIG. 8, a brush member in the shape of a brush roller in which a belt-shaped sheet material 312 in which bristle material 170 is woven around the roller 310 is wound. 142 may be used. In this case, as the receiving member 144, a crown roller (a roller whose central portion in the axial direction has a large diameter and has a smaller diameter as it goes to both ends) 314 shown in FIG. 9 or as shown in FIGS. 10A and 10B Then, it is preferable to apply a skew roller (the roller at the center in the axial direction has the largest diameter) 318 that locally presses the flat roller 316 in direct contact with the photopolymer plate 102 in the direction of the brush member 142. As shown in FIG. 11, the receiving member 144 is composed of a main body 144A and a thin plate 144B, and a coil spring 350 having a strong urging force is disposed in a central portion between the main body 144A and the thin plate 144B. By arranging the coil springs 352 each having a lower strength, the thin plate 144B is bent by the pressure received, and as a result, the photopolymer plate 10
2 may be configured to make the amount of rubbing uniform in the width direction.

The present invention relates to a photopolymer plate 102
However, the present invention can be applied to other photosensitive lithographic printing plates such as a thermal plate, a waterless lithographic printing plate, and a current photosensitive lithographic printing plate.

The present invention can be applied not only to the pre-water washing section 120 and the developing section 130 but also to other processing sections such as the rinsing section 138.

Further, the present invention is not limited to a method in which a photosensitive lithographic printing plate is immersed in a developing solution in a storage tank of a developing unit for processing. And then brushing with a brush roller.

Here, as a precautionary measure, the definitions and types of the above-described photosensitive lithographic printing plates, which are well known, will be described.

Current photosensitive lithographic printing plate The current photosensitive lithographic printing plate has a structure in which a photosensitive composition is applied in a thin layer on an aluminum plate. Developed to obtain a lithographic printing plate. The aluminum plate is usually subjected to a surface roughening treatment such as a mechanical method such as a brush grain method or a ball grain method, an electrochemical method such as an electrolytic grain method, or a method combining the both, and the surface thereof is made into a satin finish. Thereafter, it is etched with an aqueous solution of an acid or an alkali, and further subjected to an anodizing treatment and, if desired, subjected to a hydrophilic treatment to form a lithographic printing support. A photosensitive layer is provided on the support to provide a photosensitive layer. It is a lithographic printing plate.

This photosensitive lithographic printing plate is usually prepared by image exposure,
Developing, washing, and gumming processes give a lithographic printing plate,
This is mounted on a printing press and printed.

The photosensitive lithographic printing plate used for preparing the lithographic printing plate includes a positive type and a negative type. As the positive photosensitive composition, for example, those composed of an O-quinonediazide compound are widely used, and such a photosensitive substance is used alone or mixed with an alkali-soluble resin such as a novolak-type phenol resin or a cresol resin to form a support. Coated on top. When a support having a hydrophilic surface is used, the exposed portion is decomposed by the O-quinonediazide compound and changes to alkali-soluble, so that the exposed portion is easily removed with an alkali developing solution to expose the hydrophilic surface of the support. Accepts water and repels ink. On the other hand, unexposed portions remaining as images are lipophilic and accept ink.

Negative-working photosensitive compositions often use, for example, many diazonium salts, azide compounds or photopolymerizable compounds. Such photosensitive materials are used alone or mixed with additives such as suitable resins. Coated on a support.
With a support having a hydrophilic surface, the unexposed portions are removed with a developer to expose the hydrophilic surface of the support, which accepts water and repels the ink.

On the other hand, the part which is cured by exposure and remains as an image during development is lipophilic and accepts ink.

Waterless planographic printing plate The waterless planographic printing plate has, for example, a structure in which a primer layer, a photosensitive layer, and a silicone rubber layer are sequentially provided on a support. An aluminum plate that is extremely dimensionally stable is used for the support. The primer layer is, for example, an unsaturated monomer or an oligomer thereof using a hardener, a photoinitiator, a polymer or an inorganic powder as a filler for imparting shape retention of the photosensitive layer, and a thermal polymerization inhibitor as required. Etc.

The silicone rubber layer can be represented, for example, by the following chemical formula.

[0086]

Embedded image

The main component is a linear organic polysiloxane having a molecular weight of several thousand to several hundred thousand having such a repeating unit.
Here, R is an alkyl group having 1 to 10 carbon atoms or a phenyl group, and preferably 60% or more of R is a methyl group. Such a linear organopolysiloxane is
It is common to add a reactive crosslinking agent to form a crosslinked silicone rubber.

Thermal Plate (1) Positive Type The positive type thermal plate has, for example, a structure in which an undercoat layer and a photosensitive layer are provided on a support. For example, the light energy of the laser beam applied to the positive type thermal plate is converted into heat energy, the state of association of the binder in the photosensitive layer changes, and the photosensitive layer becomes alkali-soluble. This part is removed by development to make a non-image part. (2) Negative type The negative type thermal plate has a structure in which, for example, an adhesive layer and a photosensitive layer are provided on a support. For example, the light energy of the laser beam applied to the negative type thermal plate is converted into heat energy, and the acid generator in the photosensitive layer generates an acid. Thereafter, the pre-heating promotes the thermal crosslinking reaction using the acid as a catalyst to cure and form an image area. The photosensitive layer in the non-image area is dissolved and removed by development.

[0089]

[Table 1]

[0090]

As described above, the automatic developing machine for a photosensitive lithographic printing plate according to the present invention has a uniform rubbing amount by a bristle material during brushing in the removal of the photosensitive layer of the photosensitive lithographic printing plate. This has an excellent effect that the unnecessary photosensitive layer can be uniformly removed by the brushing.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an automatic developing machine common to the present embodiment.

FIG. 2 is a cross-sectional view of a photosensitive lithographic printing plate commonly applied to the present embodiment.

FIG. 3 is a perspective view of a brush member according to the embodiment.

FIGS. 4A to 4C are flowcharts showing a process of manufacturing a brush member applied in the present embodiment.

FIG. 5 is a perspective view of a receiving member according to the present embodiment.

FIG. 6 shows a receiving member according to a modification of the present embodiment,
6A is an exploded perspective view, and FIG. 6B is a side view of FIG.

FIG. 7 is a perspective view of a receiving member according to a modification of the present embodiment.

FIG. 8 is a perspective view according to a modification of the brush member according to the present embodiment.

FIG. 9 is a perspective view showing a modification of the receiving member corresponding to the modification of FIG. 8;

10A and 10B show a modification of the receiving member corresponding to the modification of FIG. 8, wherein FIG. 10A is a front view and FIG. 10B is a perspective view of a part (skew roller) of FIG.

FIG. 11 is a side view showing a modification of the receiving member corresponding to the modification of FIG. 8;

FIG. 12 is a cross-sectional view of a brush member for defining a length L of a bristle material.

FIG. 13 is a diagram showing the suitability of various printing plates in relation to the thickness and length of a bristle material.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 100 Automatic developing machine 102 Photosensitive lithographic printing plate 104 Aluminum 106 Photopolymer layer 108 Protective layer 110 Pre-heating part 120 Pre-washing part 126 Brush member 130 Developing part 132 Storage tank 138 Rinse part 142 Brush member 144,146 Receiving member 156 Finisher part 166 brush body 170 bristle material 200 sheet material 300 channel member 302 spacer (thick) 304 spacer (thin) 306 thin plate 308 chamfered portion 310 roller 312 sheet material 314 crown roller 316 flat roller 318 skewer roller

Claims (5)

[Claims] 1. An automatic developing machine for a photosensitive lithographic printing plate for processing a photosensitive lithographic printing plate with a processing liquid while transporting the photosensitive lithographic printing plate, comprising: a sheet material attached to a base member surface; and bristles woven into the sheet material. A brush body comprising a brush body provided with a material, for brushing a photosensitive layer of the photosensitive lithographic printing plate under the processing solution to promote processing, and transporting the photosensitive lithographic printing plate to the brush member The photosensitive lithographic printing plate is disposed so as to face each other across the path, and the pressing force from the brush member on the photosensitive lithographic printing plate is provided so as to be substantially the same at both the widthwise central portion and the widthwise end portions of the photosensitive lithographic printing plate. Automatic developing machine for a photosensitive lithographic printing plate having a receiving member. 2. A brush in which the bristle material is provided on a flat surface of the brush member and the brush member brushes the photosensitive lithographic printing plate by moving in at least one of a conveying direction and a width direction of the photosensitive lithographic printing plate. 2. An automatic developing machine for a photosensitive lithographic printing plate according to claim 1, wherein: 3. An automatic photosensitive lithographic printing plate as claimed in claim 1, wherein said brush member is a brush roller provided with a bristle material on a peripheral surface thereof and brushing said photosensitive lithographic printing plate by rotation. developing. 4. The material of the hair material is a natural fiber or an artificial fiber, and the thickness D of the hair material is 1 to 10,000 denier /
A length of the bristle is 1 to 35 mm, and the density P of the bristle formed as a band for brushing is P
= 1000 to 200,000 denier / cm ² (where P = D × the number of hairs per unit area (pieces / c)
m ² )), the photosensitive lithographic printing plate automatic developing machine according to any one of claims 1 to 3. 5. A brushing band, wherein the material of the bristle is a metal fiber, the wire diameter R of the bristle is R = 10 to 200 μm / strand, the length of the bristle is 1 to 30 mm, The density P of the bristle material formed as a body is P = 0.05 to
7.0 mm ² / cm ² (where P = cross-sectional area per hair (mm ² / piece) × number of hairs per unit area)
(Books / cm ² ). 4. An automatic developing machine for a photosensitive lithographic printing plate according to claim 1, wherein: