JPS6025658A - Blast nozzle - Google Patents

Abstract

PURPOSE:To make a distinct improvement in productivity and roughed surface quality, by constituting blast nozzles to be tilted so as to cause high pressure injection nozzle holes of less than half the number to direct a converging direction and the rest to come off the convergence point, in case of an aluminum supporter roughing blast nozzle for flat-bed printing use. CONSTITUTION:More than four units of high pressure injection nozzle holes 5a- 5f are installed in and around the outlet of a slurry port 32, of which half of the numbers or less, for example, 5b, 5d and 5f, of their center lines, are tilted at a specified angle theta1 with center lines X and X' of the slurry port 32 and thereby converged into a point, while the rest, 5a, 5c and 5e, of their center lines, are tilted at an angle theta1' with center lines X-X' of the slurry port 32 and also tilted at the specified angle with a direction toward the axial center of a blast nozzle body for orientation so as to come off the converging point. With the high pressure injection direction constituted like this, roughed surface quality is improved and the quantity of residual abrasives can be much reduced and, what is more, improvements in durability and smudge resisting capacity are well promoted.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for producing an aluminum support for lithographic printing plates, and in particular to a plasto nozzle used in an apparatus for roughening an aluminum support for lithographic printing.

Conventionally, as a lithographic printing plate, there is a so-called 28 plate in which a photosensitive composition is coated in layers on an aluminum plate to form a photosensitive layer. After the surface is roughened, it is etched with an aqueous acid or alkali solution, further subjected to an anodizing treatment, and then, if desired, subjected to a hydrophilic treatment to be used as a support for a lithographic printing plate. A photosensitive layer is provided on this support to form a photosensitive lithographic printing plate, that is, a 28th plate, and this 28th plate is exposed, developed, and
Processes such as correction and gumming are performed (2) to form a printing plate, which is then attached to a printing machine and printed.

Examples of surface treatment methods for the above-mentioned aluminum plate include pole grain, wire grain, brush grain,
Mechanical surface roughening methods such as liquid honing, electrochemical surface roughening methods such as electrolytic graining, or chemical surface roughening methods.

Furthermore, methods that combine λ or more of these surface roughening methods are used as appropriate.

However, each of these methods has the following problems. In the case of pole grain, this includes selecting the type (material) and size of the ball used, adjusting the moisture content during polishing, and polishing time.

There was a problem in that the evaluation of the finished surface required a particularly high level of skill, especially since it was a Pa-Tsuchi method, and the productivity was extremely low. In addition, in the case of wire gray/, the grain of the resulting aluminum plate surface is uneven, and with brush grain, the roughened surface cannot be obtained with a large degree of roughness, and the polishing blank used is worn out. In addition, the strong friction between the bristles of the brush and the abrasive agent scratches the aluminum surface in a complex manner, resulting in many sharp protrusions that resemble paris. Even when developing the 28th plate, the photosensitive layer that should have been removed remains, causing stains on the surface of the 1st plate, and when handling the aluminum plate, the treated surface (rough surface) may be rubbed against the surface, etc. There was a problem that scratches were likely to occur.

In the case of liquid honing, a slurry liquid in which fine abrasive powder is dispersed in a liquid is blown at an accelerated rate using compressed air or the like, so that the fine abrasive powder tends to pierce the aluminum surface and cause flaking. In addition, with this method, the impact force of the slurry liquid on the aluminum surface is weak, making it impossible to sufficiently increase the surface roughness.Furthermore, since the slurry liquid is ejected at an accelerated rate, there are problems such as significant wear of the ejection nozzle. Ta.

In addition, in electrochemical surface roughening, in order to make the grain of the roughened surface constant, the electrolytic conditions must be precisely controlled, the power consumption is not small, and the electrolyte It costs a lot of money to treat waste liquid containing Al ions that remain and accumulate in the surface, and in the case of chemical roughening, the processing time is long, so it is not suitable for mass production and electrochemical roughening is As with all cases, waste liquid was a huge expense.

As a result of repeated research to solve the problems in each of the above-mentioned methods, the inventors of the present invention have discovered that high-pressure liquid is jetted out from a nozzle at high speed, and this jetted flow is accompanied by fine particles of abrasive material discharged from other discharge holes. We have proposed a method for producing an aluminum support for a lithographic printing plate, which is characterized by combining slurry containing powder and colliding this combined slurry with the surface of an aluminum plate.

The present inventors further studied methods for ejecting high-pressure liquid, and as a result, the present invention was developed.

That is, the present invention provides a blast blasting system in which a slurry hole is provided in the center of the nozzle body through which a hole containing fine abrasive powder passes, and ≠ or more high-pressure water injection holes are provided around the outlet of the slurry hole. In the nozzle, the center line of less than half of the injection holes is inclined at a predetermined angle with respect to the center line of the slurry hole, so that high-pressure water is concentrated at one point, and more than half of the injection holes are The center line of each hole is inclined at a required angle to the center line of the entire slurry hole and at a required angle to the axial direction of the plasto nozzle body, so that the high-pressure water is directed away from the above-mentioned concentration points. This is a plasto nozzle characterized by the following.

The present invention will be explained in detail below.

Materials for the aluminum plate to which the present invention is applied include pure aluminum and aluminum alloys;
There are alloys whose main component is aluminum that contains trace amounts of zinc, lead, bismuth, nickel, etc. In any case, it can be said that it is preferable that the purity of aluminum is 22.0% or more.

Aluminum plates made of such materials are generally rectangular in shape for lithographic printing plates due to printing speed; It is shaped like a band and is handled by winding it up as appropriate.

The thickness of the aluminum plate is practically 0, considering the tensile strength, durability, elongation, bending strength, etc. required when a lithographic printing plate made using it is mounted on a printing machine.
．． /~o, tmm, and is selected as appropriate.

In order to roughen the surface of the aluminum plate, the blast nozzle of the present invention collides an abrasive slurry onto the surface of the aluminum plate. Consists of connected slurry holes,
Both are arranged so that the flow of slurry ejected from the slurry hole described later merges with the flow hole of high-pressure liquid ejected from the high-pressure water injection hole.

In the plasto nozzle, in which a slurry hole through which slurry containing fine abrasive powder passes is provided in the center of the nozzle body, and three or more high-pressure water injection holes are provided around the outlet of the slurry hole, one of the injection holes is Less than half of the injection holes have their center lines inclined at a predetermined angle with respect to the center line of the slurry hole so that high-pressure water concentrates on one point, and more than half of the injection holes have their center lines inclined at a predetermined angle with respect to the center line of the slurry hole. The high-pressure water is tilted at a required angle to the center line of the Plast nozzle body and at a required angle to the axial direction of the Plast nozzle body so that the high-pressure water is concentrated at the above-mentioned concentration point.

That is, they are configured so that they are separated from one point where the high-pressure water jetted from less than half of the high-pressure water jetting holes is concentrated.

The above-mentioned high-pressure liquid supply port is not only a container containing liquid maintained at high pressure, but also various types such as a system consisting of a container containing liquid under normal pressure and a pressurized injection pump connected to the container. There are certain aspects. In either embodiment, the liquid flows from the nozzles connected to the ? /, /≠Om It is necessary to eject at a flow rate of 7 seconds. The hydraulic pressure that causes this flow rate is j = / 00 kf /
It can be converted into cm2 and q.

On the other hand, the polishing slurry supply port consists of a container for storing the slurry and preferably a stirring mechanism to prevent the solid content of the slurry from settling.

The stirring mechanism for preventing sedimentation of solids may be a propeller type stirrer inserted into the container, or may be a mechanism for circulating the slurry.

By constantly moving the slurry, settling of solids can be prevented. A pipe, for example a pressure resistant hose, extends from the container to connect to the nozzle and connects the two, and a liquid feed pump for spouting the slurry is installed in the middle of this connecting pipe. .

The polishing slurry supply section has this structure.

The slurry in an agitated state is sent to the feed pump through the tail connection pipe to the supply port, and the slurry is jetted out from the jet port.

The present invention is characterized in that when this slurry is discharged, the slurry is not simply discharged, but is slightly accelerated and jetted from the discharge port. Examples of methods for spouting the slurry at an accelerated rate include a method of blowing high-pressure air onto the slurry, and a method of applying a high-pressure liquid jet flow "Ff:" using a system different from the above-mentioned high-pressure liquid system.

The composition of the slurry consists of a liquid, usually water, and a fine powder of abrasive material. Abrasive materials [7] include diamond, crystal, flint, granite, and alundum.

Corundum, 71 Ka, diatomaceous earth, sand, diamond sand, garnet, Merck, IQ miss, dolomite, magnesium oxide,
Alumina, silicon carbide, hematite, titanium dioxide, etc. are used, and the particle size of the fine powder is JIS 920~#g, 000% preferably JIS$/jO~#'100.

[7] The amount of fine powder in the slurry is 5-tO (heavy Ft) #i, and usually an amount of about 30 to JO is used. If desired, an acid and an alkaline acid can be added to the slurry.

Next, the apparatus according to the present invention will be explained specifically and in detail based on the drawings.

Figure 1 is a side sectional view of a plasto nozzle for accelerated jetting of high-pressure liquid (water) and slurry, which is an example of an embodiment of the present invention, and in Figure 1, l also serves as a nozzle for accelerated jetting of slurry. 3 is a slurry supply port constituted by a part of main body 1, t is a high-pressure water supply port, j ; 1 and 6 are high-pressure water injection holes arranged concentrically at the tip of the main body, and 6 are high-pressure water injection holes that cover the outer periphery along with the outer periphery of the front end of the main body and are screwed to the outer periphery. The barrel entrance is nQ.
It is a member that consists of In the Plast nozzle of this example, high pressure water enters the Plast nozzle through the supply log.

The liquid is injected from the injection holes ja-jd etc. through the passage ≠/.

The injection holes ja-jd, etc. are arranged concentrically at the tip of the main body (for example, as shown in the figure), and consist of several frrM, and each injection hole ja-jd, etc. has a passageway. , high pressure water from the supply log flows to each injection hole and is ejected from each injection hole.

On the other hand, the slurry flows from the supply port 3 through the supply 'Cr11 to the 6η retention part 3/, is accelerated by the air jetted from the high-pressure air supply row where the retention part 3/Vc tip is arranged, and is accelerated by the air jetting out D3 at the tip. released at a faster rate.

As the slurry passes through the slurry hole 3.2 by jetting it out at a fairly high speed, the inner wall of the slurry hole 3.2 is abraded, so it is coated with a wear-resistant material 3.27.

Figure 2 shows the arrangement of the injection holes of the main body of the device as shown in Figure 1;
b-! c...represents a state in which tf are arranged concentrically.

Micro-diameter high aqua regia injection hole! a-, jb-, tc...J-
f is directed to the slurry flow jetted out from the slurry hole 3-2 at high speed, and is jetted out from the injection hole group 'J1. The high-pressure water stream and the slurry stream spouted from the three spout ports are arranged so that they meet. The positions where both join may be the same or may be set to be different as appropriate. As shown in FIGS. 1 and 2, there are t or more high-pressure water injection holes around the outlet of the slurry hole 3.2.
In the plasto nozzle provided with b-jc...jf,
The injection hole, ta-jb-! Less than half of the injection holes c...jf, for example, tb-d-, 3-f, are irradiated with their center lines at a predetermined angle 01 with respect to the center line x-x' of the slurry hole 3-2. The high-pressure water is concentrated at a certain level, and less than half of the injection holes, such as TA-TC,
te is the center line of the slurry hole 3.2
The main idea is to irradiate the high-pressure water at a required angle IJj#t' to It is a requirement for invention.

The above relationship is shown in more detail in Figures 3-a and 3.
While the number of high-pressure water injection holes in Fig. 2 was six, in Figs. a-! b-! c...J-) The case where the number of 1's is r is shown.

FIG. 3-a is the same as FIG. The former, !a-j*, jcp, J is arranged at an angle of 01' with respect to the center line of the slurry hole and at an angle of θ2 with respect to the axial direction of the nozzle body.

Numata the latter, i.e. 5b-sri・J' f -J" 11
teeth.

It is arranged so as to converge at one point oy at an angle of 01', and θ1 and σl' may be the same or different.

iJ Figure-b shows the slurry hole 32 and high-pressure water injection hole in Figure 3-a! a-jb-! This is an enlarged view of the arrangement of . The high-pressure water injected from half of the high-pressure injection holes jb-td-jf-jh concentrates at one point O, and half of the high-pressure water injection holes ja, jc-! The high aqua regia sprayed from e-jg is
They are arranged so as to deviate from the concentration point O. As described later in the examples, the inner diameter of the slurry hole 3.2 is, for example, 10I.
Assuming TIITl, the above-mentioned "concentration at one point 0" indicates the degree of "concentration within a concentric circle with a diameter of 1 mm".

Similarly, "so that it deviates from the concentration point O" means "diameter 3r1
Scattered outside the concentric circle of 1rI+ and 1α diameter 1OITffIl
It refers to the degree to which the object does not deviate from the concentric circles of In the present invention, less than half of the plurality of high-pressure water injection ports are jb-,! in FIG. 3-a or FIG. 3-b. It shows that d-jf-jh's 9 pieces 1-7 pieces may be arranged even if djh is deviated from the concentration point (), and in this case more than half are 1', that is! a-
The arrangement is such that the high pressure water injected from jc-je-jg and th deviates from the concentration point O, and the concentration point 0 including these
The high-pressure water that deviates from is injected in a circular or elliptical tangent.

Figures 1 and 5 are side views iW and conceptual views of a projection example using the plasto nozzle according to the present invention, and 7 is an aluminum web running in the direction of the arrow. pa diagram.

01701' are the same, Figure 5 shows the case where θ1 and 0.1 are different.

Next, the present invention will be explained based on Examples 1-Z.

EXAMPLE A plasto nozzle having the configuration shown in FIG. 1 and FIG.

1) Preparation of slurry 〇 Heavy-to-low ratio abrasive disilica Particle size: 10θ μm 30 parts Water 70 parts After mixing both, the mixture was stirred using a stirrer to prevent the abrasive from settling.

2) Plast nozzle specifications a) Slurry supply port diameter (inner diameter) 20rtab) Slurry 1) - Jet port diameter -lOmmC) High pressure water injection hole diameter 2ITIITl d) Number of nozzles Total r pieces f) Arrangement method...6th According to the diagram 3) Operating conditions a) Slurry supply rate 3 t/min b) High-pressure water aqua regia ≠θ Misaki / 2 The blast nozzle was installed as shown in the diagram, and the slurry jet was set at an angle of 60° to the web. A web of aluminum plates is arranged so as to run at an angle and with a distance of 6 + ill h octn, and the web is run at a running speed of j O
It was run for 7 minutes, and slurry was jetted out under the above operating conditions.

As Comparative Example 1, as shown in Fig. 7, all the high pressure water injection holes had 02 set to /0, and as Comparative Example 2, as shown in Fig. R, all the high pressure water injection holes had 02 set to 00. Slurry was jetted onto the aluminum web using a plastic nozzle similar to that used in Examples.

The results of this example and comparative examples are shown in Figure 1.
It was as shown in Figure 0. In the diagram, the horizontal axis is the average surface roughness l-1a (unit: 2 μm).

This shows the ability to roughen the surface of an aluminum support with one nozzle. Further, in Fig. 1O, the loss of the residual abrasive material on the aluminum surface was measured, and the vertical axis shows the residual Si content (unit: mq/cm2). Too much residual abrasive can result in smudging and poor performance printing supports.

As is clear from Figs. Although it has a large surface roughness and has a large amount of residual abrasive material, it results in a printing support with poor stain resistance.

In this example, the projection pattern is large, high surface roughness can be obtained, and the amount of residual abrasive can be kept small, so it is possible to obtain a printing plate support that has good printing durability and good stain resistance. It turns out that it can be done.

The present invention is not limited to the embodiments and can be widely applied.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing one embodiment of a plasto nozzle structure according to the present invention, and / in FIG. 1 indicates the main body. C is a high-pressure air nozzle, 3 is a slurry supply port, G is a high-pressure liquid supply port, ja-tb..., th is a high-pressure liquid injection port, 3.2 is a slurry injection hole, t is an outer shell part, Figure 2 is a front view of the plasto nozzle shown in Figure 1. The symbols in Figure 1 are the same as in Figure 1, Figure 3-a is a front view of another embodiment, Figure 3-b is an enlarged view of the slurry hole and high-pressure water jet hole, Fig. ≠ Fig. ! The figure shows an example of projection using the nozzle of the present invention, where 0 indicates a concentration point and 7 indicates an aluminum web. F
B 1 shows the nozzle of the embodiment of the present invention, and FIGS. 7 and g show the nozzle of the comparative example.
Figure (・Projection pattern 7 of the nozzle of the present invention and the comparative example nozzle,
FIG. 1O is a graph showing the effects of Examples and Comparative Examples based on the present invention. Patent Applicant Fuji Photo Film Co., Ltd. Written Amendment 1. Indication of the case: Showa JT Patent Application No. 130411I/No. 2, name: Plasto Nozzle 3, person making the amendment: Relationship with the case: Patent applicant: 2-26 #30, Nishi-Azabu, Minato-ku, Tokyo, 106 Fuji Photo Film Co., Ltd. Tokyo Head Office Tel: (406) 2537 4. Subject of amendment: "Detailed Description of the Invention" shelf 5 of the detailed description of the invention. Correct as shown below. (1) Hiroyuki's statement on page 1 of the specification, ``to merging'' is corrected to ``to ga merging''. (2) In the 1st page of the specification, insert ``Indicates the position in the aluminum width direction, on the vertical axis'' after ``On the horizontal axis'' in the 10th line. that's all

Claims (1)

[Claims] A slurry hole through which slurry containing fine abrasive powder passes is provided in the center of the nozzle body, and the area around the outlet of the slurry hole is K4A (in a plasto nozzle equipped with 115 or more high-pressure water injection holes, the diameter of the injection hole is The center line of less than half of the injection holes is inclined at a predetermined angle with respect to the center line of the slurry hole so that high-pressure water is concentrated at one point, and the center line of more than half of the injection holes is inclined at a predetermined angle with respect to the center line of the slurry hole. A plasto nozzle, characterized in that the plastic nozzle is tilted at a required angle with respect to the center line of the plastic nozzle and at a required angle with respect to the axial direction of the plastic nozzle body so that high-pressure water deviates from the concentration point.