JPH08220773A - Plate making method and plate making machine for photosensitive resin printing plate - Google Patents

Abstract

PURPOSE: To shorten washing-out time and to obtain a good relief shape by applying vibrations of a specific frequency on a brush and/or plate material in a brush washing-out stage for photosensitive resin plate materials. CONSTITUTION: The washing-out tank 10 of a plate making machine 1 is internally provided with the washing-out brush 6 and a fixture 2 for the photosensitive resin plate materials facing this brush and is provided with a brush base 7 holding the brush at the root of the washing-out brush 6. A vibrator 8 is connected to this brush base 7 and a motor 3 is connected via a crank 5 to this fixture. A driven shaft 4 operates cooperatively with the motion of the fixture 2. A developer consisting of water is charged into the washing-out tank 10 to the extent of immersing the fixture 2 therein and the photosensitive resin plate materials after exposure are stuck to the fixture 2. The fixture 2 is largely circularly moved within the horizontal plane by rotation of a motor 3. On the other hand, the brush 6 is slidably supported in parallel with the photosensitive resin plate materials by a brush supporting body 7 and microvibration of >=1 second in 5 times is applied thereon by the vibrator 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photosensitive resin plate material plate making method and a plate making machine for increasing the efficiency of the photosensitive resin plate washing step. More specifically, in at least a part of the washing step, by applying a minute vibration to at least one of the brush and the plate material, the elasticity of the brush itself is used to make a fine hem of the relief of the photosensitive resin plate material. The present invention relates to a plate-making method and plate-making machine for a photosensitive resin plate material which accelerates the developing speed of a portion, shortens the washing-out time, and gives a good relief shape.

[0002]

2. Description of the Related Art In a plate making process of a photosensitive resin plate material, a photosensitive resin layer is partially cured in an exposure process and then an uncured resin is removed in a washing process to form a relief. The washout process known from the past is
It can be roughly classified into two methods. The first method is spray development in which the uncured resin is removed by ejecting a solvent from the small holes, and the second method is not developed by circularly or reciprocating linearly moving either or both of the brush and the plate material. Brush development for removing the cured resin.

[0003]

However, in the conventional spray development, development unevenness is likely to occur due to clogging of the spray nozzle and widening of the hole diameter, and a small area pattern which is physically weak by washing for a long time until the development unevenness disappears. There was a problem that parts were eluted or chipped. On the other hand, in conventional brush development, it takes a long time to completely wash out the hem of the relief of the photosensitive resin plate material,
For this reason, there is a problem that even a physically small pattern portion may be eluted or chipped.

The present invention overcomes the drawbacks of the prior art,
By applying vibration to at least one of the brush and the plate material, the development speed of the hem portion of the relief of the photosensitive resin plate material is accelerated to shorten the washout time, and a photosensitive resin plate material that gives a better relief shape is obtained. It is an object of the present invention to provide a plate making method and a plate making machine.

[0005]

To achieve the above object, the present invention has the following constitution. That is, "a plate making method for a photosensitive resin plate material, characterized in that in the brush washing step of the photosensitive resin plate material, at least one of the brush and the plate material is vibrated at a frequency of 5 times / sec or more." And an apparatus used therefor, which is a plate making machine including a photosensitive resin plate material fixing device and a brush, and further comprising means for vibrating at least one of the brush and the plate material at a frequency of 5 times / second or more. Machine. "

The present invention will be described in detail below.

First, the photosensitive resin plate material is partially exposed to light and partially photocured or photosolubilized, and then subjected to a washing-out step (developing step). As the photosensitive resin plate material used here, one containing polyvinyl alcohol or polyamide as a main component and further containing a photopolymerizable compound is preferably used.

After the exposure, washing is performed using a brush. Usually, it is carried out in the presence of a solvent such as water or alcohol. The washing step using the brush of the present invention is characterized in that minute vibration is applied to either the brush or the plate material. Examples of the minute vibrations include reciprocating linear motion and rotary motion.

As the condition of vibration, it is necessary that the frequency of vibration is 5 times / second or more, preferably 20 times / second or more. The amplitude of vibration is preferably 10 mm or less, more preferably 5 mm or less. When the frequency is less than 5 times / sec, the developing speed is lowered and the washing time cannot be shortened sufficiently. Further, when the amplitude exceeds 10 mm, the developing speed similarly decreases and the washout time cannot be shortened sufficiently.

In the present invention, it is not necessary to carry out washing with fine vibration as in the present invention at all times of the washing step of the photosensitive resin plate material, as long as it is done at least in a part of the time. good.

By the above method, the photosensitive resin plate material is
By washing out at a high developing speed, a printing plate having a good relief shape can be obtained.

Next, an example of a plate making machine for producing the photosensitive resin printing plate of the present invention will be described with reference to FIG. FIG. 1 is a perspective view from the front of a plate making machine having means capable of giving vibration to a brush. The plate-making machine 1 has a washing tank 1
0, a washing-out brush 6 and a photosensitive resin plate material fixing tool 2 are provided facing the tip of the washing-out brush. At the base of the washing brush 6, there is a brush base 7 for holding the brush. Frequency of 5 for brush stand 7
A vibrating device 8 which is a means for giving a vibration of more than one turn / second is connected. A motor 3 is connected to the photosensitive resin plate material fixing tool 2 with a crank 5 interposed therebetween.
The photosensitive resin plate material fixing tool 2 can be largely moved by the rotation of the motor. Further, the driven shaft 4 moves synchronously when the photosensitive resin plate material fixing tool 2 moves due to the rotation of the motor. Although not necessary, the lid 9 and the wash-out tank 10 are fixed by a hinge (not shown), and the lid 9 can be opened and closed.

The apparatus of FIG. 1 has a function of giving a large movement to the photosensitive resin plate material side and a minute vibration to the brush side, but the present invention does not necessarily require a means of a large movement. In addition, the arrangement of the motor giving a large motion and the vibrating device giving a fine vibration may be reversed from that shown in FIG. 1, and one of the brush side and the photosensitive resin plate side has a combined function. May be.

The positional relationship between the brush and the photosensitive resin plate material fixing tool is not limited to that shown in FIG. It does not matter if the is vertical.

Next, FIG. 2 shows the actual washing process.
Will be explained. The developer 12 made of water is poured into the washing tank 10 to the extent that the photosensitive resin plate material fixing tool 2 is immersed. The exposed photosensitive resin plate material 11 is attached to the photosensitive resin plate material fixing tool 2 made of a stainless plate with a double-sided tape or the like. The photosensitive resin plate material fixing tool 2 is driven by the motor 3 in the same manner as the conventional washing-out device.
And the photosensitive resin plate material 11 moves largely. On the other hand, the brush 6 is supported by a brush support 7 so as to be slidable in parallel with the photosensitive resin plate material, and a fine vibration which is a feature of the present invention is given by a vibrating device 8. As a result, a printing plate having a good relief shape can be obtained.

[0016]

EXAMPLES The present invention will be specifically described below with reference to examples.

Example 1 As a photosensitive resin plate material, TRELIEF WS130PX (manufactured by Toray Industries, Inc., size 150 mm × 210 mm, photosensitive layer thickness 1)
mm) was used. A negative original film (a frame of 2 cm x 4 cm, a pattern including 7th grade Mincho characters) is vacuum adhered to the photosensitive resin plate material and exposed to ultraviolet rays for 3 minutes with a chemical lamp having a wavelength of 300 to 400 nm. I went. Then, using the plate making machine shown in FIG. 1, the exposed photosensitive resin plate material is attached to the stainless steel plate 2 with a double-sided tape, and the washing resin is soaked in the washing tank 10 at 30 ° C.
After pouring tap water, the lid is closed and the motor 3 is operated for 4 minutes to perform brush development by a circular motion with a rotation speed of 1 time / second and a radius of 3 cm, and then the vibration device is operated for 1 minute and the vibration frequency is 60 times. / Sec., A reciprocating vibration having an amplitude of 2 mm was applied to perform vibration development. Development was completed in a total of 5 minutes. As a result of evaluating the plate material after development (hereinafter referred to as a printing plate), it was confirmed that the corners of the frame pattern were completely developed and that the 7th grade Mincho characters were also completely reproduced.

Example 2 In the washing step, the motor and the vibration device of the plate making machine of the present invention were simultaneously operated for 5 minutes. Other conditions are the same as in Example 1. As a result of evaluating the printing plate, it was confirmed that the corners of the frame pattern were completely developed and the 7th grade Mincho characters were also completely reproduced.

Comparative Example 1 In the washing-out step, the brush development was operated for 5 minutes by the motion of only the motor of the plate making machine of the present invention, that is, the rotation speed of 1 time / sec and the circular motion of radius 3 cm. Other conditions are the same as in Example 1. As a result of evaluating the printing plate, it was confirmed that the corners of the frame pattern were not completely developed and the 7th grade Mincho characters were completely reproduced.

Comparative Example 2 In the washing-out step, the brush development was operated for 8 minutes by the motion of only the motor of the plate making machine of the present invention, that is, the circular motion with the rotation speed of 1 time / sec and the radius of 3 cm. Other conditions are the same as in Example 1. As a result of evaluating the printing plate, the corner portion of the frame pattern was completely developed, but relief was missing in part of the 7th grade Mincho characters.

Comparative Example 3 The steps up to exposure were carried out in the same manner as in Example 1, and the obtained photosensitive resin plate material was attached to a spray type developing machine, and the development unevenness was obtained at a water pressure of 3.5 kg / cm ² and a water temperature of 30 ° C. It was washed out until it disappeared. It took 10 minutes to completely elute the unexposed area. Other conditions are the same as in Example 1. As a result of evaluating the printing plate, it was confirmed that the corner portion of the frame pattern was completely developed, but the relief was missing in a part of the 7th grade Mincho character.

[0022]

As described above, according to the present invention, by carrying out the development by fine vibration in at least a part of the washing-out step, a printing plate having a good relief shape can be obtained in a shorter time than the conventional developing method. be able to.

[Brief description of drawings]

FIG. 1 is a perspective view from the front showing an outline of a plate making machine.

FIG. 2 is a front perspective view showing an outline of washing out in a plate making machine.

[Explanation of symbols]

 1: Plate making machine 2: Photosensitive resin plate material fixing tool (stainless steel plate) 3: Motor 4: Driven shaft 5: Crank 6: Brush 7: Brush stand 8: Vibration device 9: Lid 10: Wash-out tank 11: Photosensitive resin Plate material 12: Developer

Claims (4)

[Claims] 1. A method of making a photosensitive resin printing plate, characterized in that in a brush washing step of a photosensitive resin plate material, at least one of the brush and the plate material is vibrated at a frequency of 5 times / sec or more. . 2. The plate making method for a photosensitive resin plate material according to claim 1, wherein the vibration amplitude is 10 mm or less. 3. A plate making machine comprising a photosensitive resin plate material fixing device and a brush, further comprising means for vibrating at least one of the brush and the plate material at a frequency of 5 times / sec or more. 4. A plate making machine equipped with a photosensitive resin plate material fixing device and a brush, wherein at least one of the brush and the photosensitive resin plate material fixing device has a frequency of 5 times / second or more and an amplitude of 10 mm or less. A plate making machine equipped with a vibrating means.