JPH082643B2 - Printing machine inking roller and method for manufacturing printing machine inking roller - Google Patents

Abstract

An inking cylinder adapted for a keyless inking system of a printing apparatus comprises a cylindrical base mumber, and an ink receiving layer covered over the surface of the cylindrical base member. The ink receiving layer is composed of a flexible substrate and many fine spherical members (and hard material powder) uniformly dispersed in the flexible substrate. External shell of each the fine spherical members is partially ruptured by grinding force and its hollow interior is opened. The ink on the cylinder surface is caught by this opened hollow interior of each the fine spherical members. A method for producing the above inking cylinder comprises a a first step for uniformly dispersing fine spherical members (and hard material powder) in a substrate, a second step for covering the substrate dispersed with the fine spherical members on a surface of a cylindrical base member to form an ink receiving layer on the base member, and a third step for grinding the surface of the ink receiving layer so that the fine spherical members in the surface region are partially grinded and their shells are ruptured to open the hollow interior of the fine spherical members.

Description

TECHNICAL FIELD The present invention relates to an inking roller for a printing press and a method for manufacturing an inking roller for a printing press. More specifically, the present invention relates to a roller for keyless inking, which scrapes off excess ink on the roller surface and supplies an almost constant amount of residual ink toward a printing plate, and a method for manufacturing the same.

(Prior Art) In offset printing, for example, offset printing of newspapers, ink is allowed to remain in a fine and substantially fixed cell provided regularly arranged on the surface of the mesh roller by the cooperation of a mesh roller and a doctor blade. The so-called keyless inking for supplying the remaining ink toward the plate surface has come to be performed. Then, in order to make a mesh roller suitable for keyless inking of offset printing, that is, a mesh roller that can minimize the influence of dampening water that enters the inking path through the plate surface, the mesh roller including cells A mesh roller using a lipophilic substance such as copper or a copper alloy as all or a part of the surface material is disclosed. For example, it is described in JP-A-58-42463 "Offset printing mesh roll", JP-A-58-56856 "Offset printing mesh roll", JP-A-61-181645 "Lithographic printing ink measuring roller" and the like. Is a roller.

On the other hand, as a roller whose roller surface is formed of a mixture of an inorganic powder and a resin, Japanese Patent Publication No. 59-42119, "Pressing Roll and Manufacturing Method Therefor" (hereinafter referred to as "first conventional example") and JP-A-61-696 ". Roll for press) "(hereinafter referred to as the second conventional example), JP-A-61-14997" Inking roller for offset printing "(hereinafter referred to as the third conventional example), and JP-A-62-71649" Offset printing machine ". Dampening water device "(hereinafter referred to as" fourth conventional example ")
0 Rollers disclosed in "Finishing Ink Roller for Offset Printing Machine" (hereinafter referred to as "fifth conventional example") are known. The rollers described in the first conventional example and the second conventional example are press rollers. In particular, the first conventional example discloses a roller in which the surface of the roller is made of a non-porous hard polyurethane containing stone powder and has a Shore D hardness of 70 or more. The second conventional example discloses a roller whose surface is made of a thermosetting resin containing an inorganic powder and has a Shore D hardness of 70 or more. Both the first conventional example and the second conventional example are characterized in that they have a large physical strength, are excellent in releasability from paper, and have very little surface roughness on the roller surface due to the falling of the contained powder.

The third prior art example discloses an inking roller for offset printing in which the roller surface is formed of a urethane resin containing a metal powder such as aluminum or brass. It is characterized in that it is not deteriorated by the solvent contained in the ink, has excellent releasability for the printing ink, and does not cause ink particles to scatter due to minute irregularities on the surface due to the contained powder.

In the fourth conventional example, a dampening roller for offset printing is disclosed, in which the roller surface is formed of a layer obtained by curing hydrophilic powder with a binder made of a liquid resin. Further, it is characterized in that the water is evenly flowed, has a long life, has a physical water retention property due to the fine uneven surface shape of the hydrophilic inorganic powder, and can easily repair surface scratches.

A fifth conventional example discloses a finish inking roller for offset printing in which the roller surface is formed of a flexible urethane synthetic resin containing at least one kind of oxide-based ceramic powder. Then, the powder content increases the hydrophilicity of the roller surface, that is, the lipophilicity is reduced, and therefore, the amount of ink transfer to the ink finishing roller can be reduced without increasing the ink kneading roller, and the finishing effect can be sufficiently obtained. It is characterized by the fact that it can be raised.

(Problems to be solved by the invention) The mesh roller used for the conventional keyless inking has a large number of extremely precise and substantially fixed cells arranged regularly on the surface, and excessive ink scraping off of the doctor blade is performed. As a result, the amount of ink remaining in the cell becomes a fairly accurate constant amount.

However, special cell processing was required to form cells on the surface of the mesh roller. Further, even if cells are provided, the mesh roller is worn by the doctor blade in the operating state, so the surface of the mesh roller is worn away over time and the cells gradually become shallower. There was a problem that the amount of ink could not be supplied enough for printing because it decreased, and it became unusable.

On the other hand, the rollers disclosed in Conventional Example 1 to Conventional Example 5 in which the surface of the roller is formed of a mixture of an inorganic powder and a synthetic resin can increase the surface hardness by containing the inorganic powder, so that the wear resistance is improved. Although it can be estimated that it is effective in achieving the above, in the case where the doctor blade is brought into contact with the roller surface to scrape off excess liquid such as ink adhering to the roller surface and leave a substantially constant amount of liquid on the roller surface. There wasn't.

(Means for Solving the Problem) The present invention is to mix and mix fine hollow bodies and hard inorganic powder harder than the ink-receiving layer base material in an ink-receiving layer base material made of a flexible substance substantially evenly. Equipped with an ink receiving layer on the surface,
The hollow part of the micro hollow body located at the outer peripheral position of the roller is provided by opening the inking roller of the printing machine, and the ink receiving layer base material made of a flexible synthetic resin can be used as the micro hollow body. The surface is equipped with an ink receiving layer in which hard inorganic powders such as ceramics, metals, and alloys harder than a flexible synthetic resin are mixed and mixed almost evenly, and the hollow portion of the micro hollow body located at the outer peripheral position of the roller is opened. Inking roller of a printing machine characterized by being provided as a step, and a step of substantially uniformly dispersing a resin or rubber into a hollow microparticle and a hard inorganic powder such as ceramics, metal or alloy harder than resin or rubber. , Then, a resin or rubber in which the fine hollow body and the hard inorganic powder obtained in the above step are substantially evenly dispersed, a step of coating the mother member surface to form an ink receiving layer, then, The step of grinding the surface of the ink receiving layer covering the surface of the mother member, removing a part of the shell layer of the minute hollow body located on the surface of the ink receiving layer to open the hollow portion, and exposing the hard inorganic powder By providing a method for manufacturing an inking roller for a printing machine, characterized by:

(Function) A step of dispersing fine hollow bodies in a resin or rubber and hard inorganic powders such as ceramics, metals, and alloys harder than the resin or rubber in a substantially uniform manner, and then the fine hollow bodies and the hard obtained in the above step The step of coating the mother member surface with the resin or rubber in which the inorganic powder is substantially evenly dispersed to form the ink receiving layer, and then grinding the ink receiving layer surface covering the mother member surface to locate it on the ink receiving layer surface. By removing a part of the shell layer of the micro hollow body to open the hollow portion, by the method of manufacturing an inking roller of a printing machine, which comprises a step of exposing the hard inorganic powder,
An ink-receiving layer made of resin or rubber is provided on the surface thereof with an ink-receiving layer in which fine hollow bodies and hard inorganic powders such as ceramics, metals, and alloys harder than resin or rubber are mixed and dispersed substantially evenly on the surface. An inking roller for a printing machine is obtained, in which a hollow portion of a minute hollow body located at an outer peripheral position is provided by opening.

Further, in the inking roller of the printing machine, when the ink is supplied to the ink receiving layer, the ink is entangled with the surface of the ink receiving layer, and at the hollow portion of the micro hollow body that opens the hollow portion on the surface of the ink receiving layer. Retained. In this state, when a doctor blade is brought into contact with the surface of the ink receiving layer to scrape off excess ink, the micro hollow body that opens a hollow portion on the surface of the ink receiving layer acts as if it were an ink holding cell. Since the ink held in the hollow portion is continuously retained, almost constant ink remains in the ink receiving layer. Furthermore, even if the roller surface wears due to friction with the doctor blade, the ink-receiving layer will be exposed and opened as the minute hollow bodies are progressively exposed as the surface of the ink-receiving layer wears, so the excess ink is scraped off by the doctor blade. Even when it receives the ink, there is no significant change in the ink holding property of the roller surface and no significant change in the roller surface shape and properties.

Furthermore, when the hard inorganic powder is mixed in the ink receiving layer, and therefore when the friction action works on the ink receiving layer like scraping off excess ink with a doctor blade,
The hard inorganic powder exposed on the surface can bear this,
It is possible to suppress wear of the ink receiving layer and prolong the life of the inking roller.

Furthermore, some materials are mixed in the ink receiving layer of these inking rollers, but if the mixed state of each material is kept substantially evenly distributed, even if the ink receiving layer is worn out, the ink receiving layer will be in the same state. Is retained on the surface of the ink receiving layer and does not cause a difference that affects the amount of ink retained and abrasion resistance, and provides almost the same performance as an inking roller for a long period of time before the ink receiving layer is completely worn. maintain.

(Example) Fig. 1 is a schematic perspective view of an inking roller according to an embodiment of the present invention, Fig. 2 is a partial enlargement of an ink receiving layer of the inking roller, and another embodiment of the present invention. Description will be given with reference to FIG. 3 showing a partial enlargement of the ink receiving layer of the inking roller.

(1) is an inking roller. The inking roller (1) has an ink receiving layer (2) formed on the surface of a base member (6) made of, for example, steel. The ink receiving layer (2) is a mixture of an ink receiving layer base material (4) and micro hollow bodies (3) dispersed in the ink receiving layer base material (4) as shown in FIG. It consists of uniform layers. Alternatively, as shown in FIG. 3, it is composed of a substantially uniform layer in which a hard inorganic powder (5), an ink receiving layer base material (4) and a micro hollow body (3) are mixed.

As the ink receiving layer base material (4), a flexible material was used in this example, and a urethane resin which was a flexible synthetic resin was used. Resin, other resin, or rubber may be used.

The minute hollow body uniformly dispersed in the ink receiving layer base material (4) may be any one capable of forming an opening of the hollow portion by removing a part of the shell layer. The micro hollow body (3) is generally called a micro balloon, a micro sphere, a hollow valve, and a syntactic foam material, and for example, carbon balloon, glass balloon, silica balloon, silas balloon, phenol balloon, vinylidene chloride balloon, alumina. Hollow powders of various materials called balloons and zirconia balloons are known. One or two, for example, US VERSAR Man
There are "Carbo Spheres" (trademark) manufactured by ufacturing Inc. and "Fillite" (trade name) manufactured by UK Philite. The former is a carbon balloon, the bulk density is 0.15 g / cm ³ , the particle thickness is 1 to 2 μm, the particle size distribution is 50 to 150 μm (average particle size 50 μm), the particle size distribution is 5 to 100 μm (average particle size 45 μm).
m), a particle size distribution of 5 to 50 μm (average particle size 30 μm), and a particle size distribution of 50 to 150 μm (average particle size 60 μm). Further, those whose surfaces are coated with nickel, iron, copper, gold or the like are also known and effective.
The latter is a silica balloon having a bulk density of 0.4 g / cm ³ and a particle size distribution of 30 to 300 μm.

In the present invention, at least the fine hollow body (3) having a powder content of 5 to 300 μm can be used.

As the hard inorganic powder (5), for example, ceramic powder, metal powder, alloy powder or the like can be used. The size of the hard inorganic powder may be at least about 1 to 100 μm.

Next, a method of manufacturing the inking roller will be described. First, in the inking roller illustrated in FIG. 2, the micro hollow body (3) is provided in the ink receiving layer base material (4).
Evenly distribute. In the inking roller shown in FIG. 3, the micro hollow bodies (3) and the hard inorganic powder (5) are evenly dispersed in the ink receiving layer substrate (4). This step is carried out by an appropriate means such as a mixing or kneading means adapted to the properties of the ink receiving layer substrate (4). The surface of the base member (6) is coated with the obtained hollow micro-body (3) or the ink receiving layer base material (4) in which the micro-hollow body (3) and the hard inorganic powder (5) are evenly dispersed. To form the ink receiving layer (2). This step is performed by an appropriate means such as casting, winding or coating. Then, the surface of the ink receiving layer (2) covering the surface of the mother member (6) is ground. Grinding may be performed by a grinding machine or by friction with a doctor blade after the inking roller is installed on the rotary press. Then, as shown in FIG. 2, in the ink receiving layer (2) in which the micro hollow bodies (3) are dispersed,
A part of the shell layer of the micro hollow body (3) existing near the surface of the ink receiving layer (2) is removed to expose the inner surface of the hollow, and the hollow portion is opened on the surface of the ink receiving layer (2). Become. Further, as shown in FIG. 3, in the ink receiving layer (2) in which the fine hollow body (3) and the hard inorganic powder (5) are dispersed, it exists near the surface of the ink receiving layer (2). A part of the shell layer of the micro hollow body (3) is removed to expose the inner surface of the hollow to open the hollow portion on the surface of the ink receiving layer (2), and the hard inorganic powder (5) receives the ink. It is exposed on the surface of the layer (2).

Next, the inking roller (1) according to this embodiment
The operation of will be described. In the inking roller (1) shown in FIG. 2, in the ink receiving layer (2),
When the ink is supplied, the ink is entangled with the surface of the ink receiving layer (2) and is held in the open hollow portion of the minute hollow body (3) having a hollow portion on the surface of the ink receiving layer (2). In this state, when a doctor blade is brought into contact with the surface of the ink receiving layer (2) to scrape off excess ink, the micro hollow body (3) having a hollow portion on the surface of the ink receiving layer (2) is Since the ink retainer cell acts like an ink retainer and retains the ink retained in the hollow portion, almost constant ink remains in the ink receiving layer (2). In the inking roller (1) shown in FIG. 3, the hard inorganic powder (5) is mixed in the ink receiving layer (2), so that the ink receiving layer is like scraped off of excess ink by a doctor blade. (2)
When the frictional action is exerted on the surface, the hard inorganic powder (5) exposed on the surface can bear this, so that the wear of the ink receiving layer (2) is suppressed and the life of the inking roller (1) is extended. It becomes possible.

In each of the inking rollers (1) shown in FIGS. 2 and 3, some materials are mixed in the ink receiving layer (2), but the mixed state of each material is kept substantially uniform. Therefore, even if the ink receiving layer (2) is worn, the substantially same state is maintained, the shell layer on the surface side of the ink receiving layer (2) of the micro hollow body (3) is sequentially removed, and the hollow portion is opened,
Alternatively, the hard inorganic powder (5) is exposed. for that reason,
A difference that affects the ink retention amount and abrasion resistance is not generated, and substantially the same performance as the inking roller (1) is maintained for a long time before the ink receiving layer (2) is almost worn out.

(Effects of the Invention) Therefore, in the inking roller of the printing press according to the present invention, when ink is supplied to the ink receiving layer, the ink is entangled with the surface of the ink receiving layer, and at the same time, minute holes are opened in the hollow surface of the ink receiving layer. It is held in the open hollow part of the hollow body. In this state, when a doctor blade is brought into contact with the surface of the ink receiving layer to scrape off excess ink, the micro hollow body that opens a hollow portion on the surface of the ink receiving layer acts as if it were an ink holding cell. Since the ink retained in the hollow portion is continuously retained, almost constant ink remains in the ink receiving layer. Furthermore, even if the roller surface wears due to friction with the doctor blade, the ink receiving layer will be exposed and opened as the minute hollow bodies are progressively exposed as the surface of the ink receiving layer wears. Even when it receives the ink, there is no significant change in the ink holding property of the roller surface and no significant change in the roller surface shape and properties. Therefore, if it is used as a keyless inking fixed-quantity ink supply roller, the ink retention amount does not decrease with the progress of wear unlike a conventional mesh roller, and it can be used for a long time and the print quality during that period can be kept constant. Can be kept at. Furthermore, unlike the conventional mesh roller, it is not necessary to perform cell processing on the surface or special coating treatment, and thus it can be provided at a lower cost than the conventional mesh roller.

Furthermore, when the hard inorganic powder is mixed in the ink receiving layer, and therefore when the friction action works on the ink receiving layer like scraping off excess ink with a doctor blade,
Since the hard inorganic powder exposed on the surface can bear this,
It becomes possible to suppress the abrasion of the ink receiving layer and prolong the life of the inking roller.

Furthermore, since the ink receiving layer base material is made of a flexible material, the hardness is lower than that of the conventional mesh roller surface, so the wear of the doctor blade that scrapes the ink by abutting this is reduced and the doctor blade Enables long-term use.

Furthermore, in the method for manufacturing an inking roller of a printing machine according to the present invention, the role of the cell is achieved by a simple operation of mixing the micro hollow body and the hard inorganic powder in the ink receiving layer without separately performing cell processing. There is provided an ink roller for a printing machine, which has a fine hollow body that sequentially opens with the passage of time and can suppress abrasion due to a doctor blade or the like.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic oblique view of an inking roller according to an embodiment of the present invention, FIG. 2 is a partially enlarged view of an ink receiving layer of the inking roller, and FIG. It is a partially expanded view of an ink receiving layer of an inking roller according to another embodiment of the invention. (1) ... Inking roller, (2) ... Ink receiving layer, (3) ... Micro hollow body, (4) ... Ink receiving layer base material, (5) ... Hard inorganic powder, (6) ...... Mother member,

Claims (3)

[Claims] 1. An ink-receiving layer comprising an ink-receiving layer base material made of a flexible material, on the surface of which fine hollow bodies and hard inorganic powders harder than the ink-receiving layer base material are substantially uniformly dispersed and mixed. The inking roller of the printing machine is characterized in that the hollow portion of the minute hollow body located at the outer peripheral position of the roller is opened and provided. 2. An ink in which fine hollow bodies and hard inorganic powders such as ceramics, metals, alloys, etc., which are harder than flexible synthetic resin, are mixed and dispersed substantially uniformly on an ink receiving layer substrate made of flexible synthetic resin. An inking roller for a printing press, comprising a receiving layer on the surface and a hollow portion of a minute hollow body located at an outer peripheral position of the roller having an opening. 3. A step of dispersing fine hollow bodies in a resin or rubber and hard inorganic powders such as ceramics, metals and alloys harder than the resin or rubber in a substantially uniform manner, and then the fine hollow bodies obtained in the above step. And a step of coating the mother member surface with the resin or rubber in which the hard inorganic powder is substantially evenly dispersed to form an ink receiving layer, and then grinding the ink receiving layer surface coating the mother member surface to form the ink receiving layer surface. A method for producing an inking roller for a printing press, comprising the steps of removing a part of the shell layer of the micro hollow body located in the step of opening the hollow part and exposing the hard inorganic powder.