JP2007276208A - Nonwoven fabric winding roll - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a nonwoven fabric winding roll which is resistant to abrasion of a surface and hardly deteriorates in the performance of winding a nonwoven fabric. <P>SOLUTION: The nonwoven fabric winding roll 9 consists of a hard material such as an alloy containing any in the group consisting of nickel-chromium steel, stainless steel, titanium and aluminum or an element thereof. This basic material of the roll is subjected to shot blasting and further to electric-arc spraying or gas spraying. It can also be subjected further to plasma spraying of a ceramic. The surface roughness of the roll is 5 μm Ra and 30 μm Rz or above and the friction coefficient is 0.22 or above. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention particularly relates to a nonwoven fabric winding roll.

  In general, in offset printing, a printing plate used for printing has a hydrophilic portion where there is no image. When the entire printing plate is immersed in water, water adheres to the hydrophilic portion. Subsequently, when the entire printing plate is immersed in ink, the water adhering portion repels the ink, and the ink adheres only to the image portion. An image composed of ink on the printing plate is once transferred to a blanket such as rubber and then transferred to paper. FIG. 4 shows an explanatory diagram of the offset printing mechanism.

  By the way, since the image of the printing plate is repeatedly transferred to this blanket, in order to maintain a beautiful printing result, the blanket must be washed every certain number of times of printing. In general, the blanket is washed by bringing a nonwoven fabric into contact with a blanket roll and passing the nonwoven fabric while applying a strong tension to transfer stains such as ink adhering to the blanket to the nonwoven fabric.

Conventionally, a take-up roll as shown in FIG. 10 has been used as a roll for taking up the nonwoven fabric from which the dirt on the blanket has been wiped off. This is because a ribbon having protrusions with a width of 35 to 70 mm made of aluminum alloy or stainless steel as shown in FIG. 11 is formed on the outer peripheral surface of a metal roll made of aluminum material, titanium material, SUS material or the like. The metal roll is wound in the shape of a gaiter and both ends thereof are eyelets, dowel pins, or screws. When the protrusions are difficult to woven into the nonwoven fabric, the used nonwoven fabric can be wound up.
Japanese Utility Model Publication No. 5-60843 JP-A-9-248902

  However, such a conventional nonwoven fabric winding roll has a problem in that the ribbon is stretched due to a strong tension, cracks and breaks. In addition, since the base material of the ribbon forming the protrusion is a thin plate, the protrusion is worn quickly with repeated use, and the winding performance of the non-woven fabric is degraded. On average, it is only about 1 to 3 years. There was a problem that it could not be used.

  Moreover, about the roll which winds up this nonwoven fabric, although the invention of patent document 1 etc. are mentioned, for example, since the roll shape is complicated in the invention of patent document 1, there is a problem that the winding roll becomes expensive. there were.

  Similarly, although the invention described in Patent Document 2 can also be mentioned, in this invention, it is necessary to process the tip of the nonwoven fabric, and the roll shape processing is troublesome, so that there is a problem of poor practicality. was there.

  This invention is made | formed in view of such a condition, and it aims at providing the nonwoven fabric winding roll which can solve the said problem.

In order to solve the above problems, the present invention has the following configurations.
The gist of claim 1 is a non-woven fabric take-up roll for cleaning a blanket of an offset printing machine, characterized in that a roll base material made of a hard material is shot blasted and further subjected to arc spraying. It exists in a nonwoven fabric winding roll.
The gist of claim 2 is a non-woven fabric take-up roll for cleaning a blanket of an offset printing press, wherein a roll base material made of a hard material is shot blasted and further subjected to gas spraying. It exists in a nonwoven fabric winding roll.
The gist of claim 3 resides in the nonwoven fabric take-up roll according to claim 1 or 2, wherein ceramic is plasma sprayed.
The gist of claim 4 resides in the nonwoven fabric take-up roll according to claim 1, wherein the nonwoven fabric take-up roll has a surface roughness of 5 μmRa or more.
The gist of claim 5 resides in the nonwoven fabric take-up roll according to claim 1, wherein the nonwoven fabric take-up roll has a surface roughness of 30 μmRz or more.
The gist of claim 6 resides in the nonwoven fabric take-up roll according to any one of claims 1 to 5, wherein the nonwoven fabric take-up roll has a surface friction coefficient of 0.22 or more.
The gist of claim 7 is the nonwoven fabric according to any one of claims 1 to 6, wherein the hard material is made of any alloy or simple substance of the group consisting of nickel chrome, stainless steel, titanium and aluminum. It exists in a winding roll.
The gist of claim 8 resides in the nonwoven fabric take-up roll according to any one of claims 1 to 7, wherein the rough surface processing of the roll base material is a part of the nonwoven fabric contact surface.
The gist of claim 9 resides in a nonwoven fabric take-up roll according to any one of claims 1 to 8, wherein a plurality of rough surfaces of the roll base material are provided on the nonwoven fabric contact surface.
The gist of claim 10 resides in an offset printing machine using the nonwoven fabric take-up roll according to any one of claims 1 to 9.
The subject matter of claim 11 resides in a nonwoven fabric winding method for cleaning a blanket of an offset printing machine, wherein the nonwoven fabric winding roll according to any one of claims 1 to 9 is used.

  Since the surface roughness of the nonwoven fabric take-up roll of the present invention is set to a certain level or more by shot blasting and arc spraying, the used nonwoven fabric can be wound up well without idling. In addition, since the base material is a hard material, there is very little wear on the surface in contact with the non-woven fabric, and there is a remarkable effect that it can be used semipermanently.

  Hereinafter, embodiments of the present invention will be described in detail.

The nonwoven fabric winding roll 9 of this embodiment can be manufactured as follows. First, a metal roll as a base material is subjected to shot blasting to remove surface oil and roughen the surface. The metal roll as the base material is preferably a single metal such as nickel chrome, stainless steel, titanium and aluminum, or an alloy thereof, in terms of hardness and workability. Because of the problem of lifting due to rust, 18% Cr alloy is not suitable for use as a base material, but can be used as a base material for the nonwoven fabric winding roll of this embodiment. The metal roll may have any shape as long as it can be shot blasted and plasma sprayed, for example, a solid roll or a pipe roll. May be. This shot blasting is preferably performed by spraying particles of silica or alumina of 36th count, that is, 25.4 mm / 36φ of about 70 μm. The distance from the nozzle to the work station is preferably 150 mm. The air pressure is preferably 0.39 to 0.59 Mpas.G, and the construction speed is preferably 4.5 to 9.0 m ³ / hr. In addition, this embodiment is not limited to these construction conditions, and shot blasting may be performed under other implementation conditions as long as oil removal and roughening of the ground can be performed. In addition, if the dirt of the oil such as a new base material is severe, it may be washed with methylene chloride in advance or baked with 180 ° C oil for 12 hours to remove the oil.

  Next, the surface roughness of the metal roll base material shot blasted in this way is further roughened by arc spraying. This arc spraying is usually preferably performed using Ni-Cr wire. The distance from Gun to work station is preferably 250mm. The peripheral speed of work is preferably 60m / min, and what is sparking is blown with Air. The particle size of the particles to be blown varies depending on the air feed rate, but this is fixed and controlled by the distance from Gun. The processing thickness is preferably 0.8 to 1.5 mm. As for the speed of Air, an Air compressor is used, and the pressure is preferably 0.49 Mpas.G. Further, instead of arc spraying, the surface roughness can be increased by gas spraying using SUS304 wire. In this case, the distance from Gun to the work station is preferably 150 mm. By this arc spraying or gas spraying, the surface roughness of the metal roll base material becomes 5 μmRa or more.

  As a result of intensive studies on the surface processing of the metal roll base material to satisfy the winding performance of the nonwoven fabric, the inventors have used a surface roughness of 5 μmRa or more by the above shot blasting / arc spraying or gas spraying. The present inventors have found that a nonwoven fabric winding roll that produces sufficient frictional force to wind up a used nonwoven fabric and is resistant to abrasion can be produced. The surface roughness is 5 μm Ra or more for Ra, and this corresponds to 30 μm Rz or more for Rz. Moreover, the coefficient of friction of the nonwoven fabric take-up roll under these conditions is approximately 0.22 or more. The above-described surface roughness standard and friction coefficient calculation method will be described in detail in the following examples. The surface roughness Ra of the nonwoven fabric take-up roll of the present invention is not particularly limited, and may be rough enough to wind up the nonwoven fabric. It is preferably about Ra or less.

The nonwoven fabric take-up roll 9 of the present embodiment can further increase the strength against surface wear, particularly sliding wear, by further plasma spraying the ceramic. Regarding plasma spraying of ceramics, although the conditions vary depending on the particle size of Powder, it is usually 5-15 μm and the temperature is preferably 80 ° C. (˜130 ° C.). The distance from Nozzle to the work station is preferably 64-152 mm, more preferably 100 mm. Normally, particles are blown at a speed lower than the speed of sound, but it is also possible to blow particles at a speed higher than Mach using W-Carbide to increase the hardness. For example, K-11 from Showa Denko is preferably used as the powder. K-11 has an average particle size of 34.3 μm, a composition of 96.5% alumina, 2.64% titanium dioxide, 0.43% silica, and 0.07% ferric trioxide, and is called gray alumina. As the spray gun, for example, 3MD is preferably used. Using these spray guns, Arc is generated by discharge against Ar-hydrogen, fed into a tapered Nozzle (GH) using N ₂ , and a powder is placed on the resulting flame (9800 ° C) to fly. It is preferable. The processing thickness is preferably 0.1 mm or less. Although the surface roughness of the ceramic is slightly rounded by this plasma spraying of the ceramic, it hardly affects the winding of the nonwoven fabric, which is the purpose of the nonwoven fabric winding roll 9 of the present invention. The whole figure of the nonwoven fabric winding roll 9 of this embodiment is shown in FIG. Moreover, the enlarged view about the rough surface process part 93 of the nonwoven fabric winding roll 9 is shown in FIG. FIG. 3 shows an operation explanatory diagram when cleaning the blanket.

  The nonwoven fabric winding roll 9 of the present embodiment roughens the surface of a hard material such as metal by shot blasting / arc spraying or gas spraying, while maintaining a frictional force sufficient to wind the nonwoven fabric without spinning. It has outstanding features such as extremely high durability such as wear resistance and a very long product life. Further, since it is only necessary to shot blast the hard material roll and perform arc spraying or gas spraying, the processing is relatively easy, and it can be applied to a nonwoven fabric winding roll of any size. In addition, it is also possible to produce a non-woven fabric take-up roll with higher wear resistance by further performing ceramic plasma spraying on the surface. For this reason, when the nonwoven fabric take-up roll of the present invention is used in an offset printing machine, there is no need for almost permanent replacement, greatly reducing the chances of having to stop the printing operation and giving the user confidence. There is a remarkable effect that a sense of security can be given.

  In the present embodiment, the rough surface processing by shot blasting / arc spraying or gas spraying does not need to be performed on the entire winding surface of the nonwoven fabric winding roll 9, for example, as shown in FIG. As long as it is within the range, only a part of the winding surface may be the rough surface processed portion 93. Similarly, as shown in FIG. 6, a plurality of rough surface processed portions 93 may be provided. As a remarkable effect of the embodiment as shown in FIGS. 5 and 6, since the area of the roughened surface processing portion 93 can be reduced, there is a remarkable effect that the processing cost can be greatly reduced. . In addition, by providing a plurality of rough surface processed portions as shown in FIG. 6, there is a remarkable effect that it is possible to ensure friction on the entire surface of the nonwoven fabric contact surface while reducing the processing area.

  EXAMPLES Hereinafter, examples and comparative examples of the present embodiment will be shown to specifically describe the present invention, but the present invention is not limited to the following examples.

Based on the above embodiment, a nonwoven fabric take-up roll was produced. As the hard material of the base material, an S25C muku material having a diameter of 45 mm was used. Shot blasting was performed by spraying 36th alumina particles, the distance from the nozzle to the work station was 150 mm, the air pressure was 0.49 Mpas.G, and the construction speed was 6.5 m ³ / hr. Arc spraying was performed using Ni-Cr wire, the distance from Gun to the work station was 250 mm, the peripheral speed of the work was 60 m / min, and the processing thickness was 0.8-1.5 mm. For the air speed, an air compressor was used and the pressure was 0.49 Mpas.G. Furthermore, the ceramic was plasma sprayed. K-11 (Showa Denko) was used for the powder. The temperature was 80 ° C, the distance from Nozzle to work station was 100mm, and the particles were blown below the speed of sound. Spray Gun: 3MD is used to make Arc by discharge against Ar-hydrogen, N ₂ is used to feed into tapered Nozzle (GH), and the resulting flame (9800 ° C) is placed on the Powder, and then blown. Plasma spraying was performed. The processing thickness was set to 0.1 mm or less.

  The nonwoven fabric winding roll thus prepared was polished with a film with 80 μm diamond particles and a film with 30 μm diamond particles to prepare five types of surfaces with rounded surface roughness. A non-woven fabric having a width of 10 mm was wound around this non-woven fabric take-up roll, and this non-woven fabric was taken up by a motor to conduct a winding test. The case where it was able to be wound without being idle was indicated by ○, and the case where it was idle was indicated by ×. And the surface roughness of each surface was measured using Surfcorder SE1700 (alpha), and Ra, Rz, and Ry were computed. Further, the weight and friction coefficient indicated by the spring balance were measured from the apparatus and calculation method as shown in FIG. A list of results is shown in Table 1 below. Since Ra, Rz, and Ry, which are indicators of surface roughness, vary greatly depending on the measurement location, FIGS. 7 and 8 are diagrams showing the relationship between Ra and the friction coefficient, and the relationship between Rz and the friction coefficient, from each test result. Shown in

  As shown in Table 1, in this example, only the take-up roll of Table 1F could not wind up the nonwoven fabric and was idle. In Ra, Rz, and the coefficient of friction, when compared with D and E, which had no problem in the winding test, F is a numerical value that makes it easier to catch the nonwoven fabric than D and E, which are contradictory results. However, the measurement of Ra, Rz, and the coefficient of friction has very large variations, and it is considered that such a numerical result is obtained depending on the error range. Therefore, graphs as shown in FIGS. 7 and 8 were created from the measurement results of the samples in Table 1, and the relationship between the friction coefficient and Ra and Rz was estimated. As a result, in the linear relationship estimated in FIGS. 7 and 8, a surface roughness with a friction coefficient of approximately 0.22 is necessary for winding the nonwoven fabric without spinning as a nonwoven fabric winding roll of the present invention. I found out. Further, from the value of the coefficient of friction of 0.22 and the estimated lines of FIGS. 7 and 8, the surface roughness required for the nonwoven fabric winding roll of the present invention is required to be about 5 μm Ra for Ra and about 30 μm Rz for Rz. It was found that It was shown that the test nonwoven fabric take-up roll indicated as “◯” in the winding test result does not rotate freely even when tension is applied with a motor until the nonwoven fabric is torn off, and can be suitably used.

  It should be noted that the present invention is not limited to the embodiment described above, and it is obvious that the embodiment can be appropriately changed within the scope of the technical idea of the present invention.

  Since the nonwoven fabric winding roll of the present invention can remarkably improve the surface abrasion resistance as compared with conventional products, an offset printing machine that does not require semi-permanent replacement of the nonwoven fabric winding roll can be provided.

Schematic of the nonwoven fabric take-up roll in the embodiment of the present invention The enlarged view of the surface of the nonwoven fabric winding roll in embodiment of this invention Operation explanatory drawing of the nonwoven fabric winding roll in the embodiment of the present invention Illustration of offset printing machine Modifications of the embodiment of the present invention Modifications of the embodiment of the present invention The figure which shows the relationship between Ra and the friction coefficient in the Example of this invention. The figure which shows the relationship between Rz and the friction coefficient in the Example of this invention. Explanatory drawing of the measuring method of the friction coefficient in the Example of this invention Explanatory drawing of conventional nonwoven fabric take-up roll Explanatory drawing of a ribbon with protrusions for a conventional nonwoven fabric take-up roll

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Conventional ribbon with protrusion for nonwoven fabric winding roll 2 Protrusion portion of ribbon with protrusion 3 Hole for making protrusion portion 4 Conventional nonwoven fabric winding roll 5 Nonwoven fabric 51 Spring alone 52 Weight 6 Blanket cylinder 71 Ink roller 72 Water roller 73 Plate Cylinder 74 Pressure Cylinder 75 Pressing Pad 8 Printed Material 9 Nonwoven Fabric Winding Roll 91 Blanket Washing Nonwoven Fabric 92 Nonwoven Fabric Roll 93 Rough Surface Processing Portion A Expanded portion of the rough surface processing portion of the nonwoven fabric winding roll

Claims (11)

  A nonwoven fabric take-up roll for washing a blanket of an offset printing machine, wherein a roll base material made of a hard material is shot blasted and further subjected to arc spraying.   A nonwoven fabric take-up roll for cleaning a blanket of an offset printing machine, wherein a roll base material made of a hard material is shot blasted and further subjected to gas spraying.   The nonwoven fabric take-up roll according to claim 1 or 2, wherein ceramic is plasma sprayed.   The nonwoven fabric winding roll according to any one of claims 1 to 3, wherein the nonwoven fabric winding roll has a surface roughness of 5 µmRa or more.   The nonwoven fabric winding roll according to any one of claims 1 to 4, wherein the nonwoven fabric winding roll has a surface roughness of 30 µmRz or more.   The nonwoven fabric winding roll according to any one of claims 1 to 5, wherein the nonwoven fabric winding roll has a surface friction coefficient of 0.22 or more.   The nonwoven fabric take-up roll according to any one of claims 1 to 6, wherein the hard material is made of an alloy or a simple substance selected from the group consisting of nickel chrome, stainless steel, titanium, and aluminum.   The nonwoven fabric take-up roll according to any one of claims 1 to 7, wherein the rough surface processing of the roll base material is part of the nonwoven fabric contact surface.   The nonwoven fabric take-up roll according to any one of claims 1 to 8, wherein a plurality of rough surfaces of the roll base material are provided on the nonwoven fabric contact surface.   An offset printing machine using the nonwoven fabric take-up roll according to any one of claims 1 to 9.   A nonwoven fabric winding method for cleaning a blanket of an offset printing machine, wherein the nonwoven fabric winding roll according to any one of claims 1 to 9 is used.

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