JP2007246219A - Light non-adhesive guide roller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To maintain high slip performance and non-adhesiveness between a roller surface and a surface of newspaper for a long time and prevent roller dirt for a long time. <P>SOLUTION: Fluorocarbon resin tubes 2 are press-bonded to at least both end parts and a central part of a roller base material 1 made of carbon fiber reinforced resin, and a mixture layer 3 made of resin and fine aggregate is formed on the surface of the roller base material 1 other than the portions to which the fluorocarbon resin tubes 2 are press-bonded, such that the surface becomes a surface 3c with minute irregularities. Then, the surface 3c with minute irregularities is coated with non-adhesive resin 4. The surfaces of the fluorocarbon resin tubes 2 are protruded from the surface of the non-adhesive resin 4 coating layer by 0.1 to 0.5 mm. Due to this structure, the surfaces of the fluorocarbon resin tubes 2 are preferentially brought into contact with the newspaper surface, and friction force between the entire roller and the newspaper surface can be reduced (with good slip performance). Moreover, the slip effect between the roller and newspaper surface can prevent adherence of ink and paper powder and generation of paper wrinkles. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a guide roller used in a printing press such as a newspaper rotary press or an offset rotary press.

  In printing presses such as newspaper rotary presses and offset rotary presses, in recent years, guide rollers made of carbon fiber reinforced resin are often used in order to increase printing speed, reduce the weight of roller groups, and reduce equipment costs.

  The width of paper printed on a newspaper rotary press is the width of a newspaper spread (hereinafter referred to as “D winding”), and the width of a newspaper spread plus half of the spread (hereinafter “ C winding "), a paper whose width is twice that of a newspaper (hereinafter referred to as" A winding "), and a paper whose width is half that of a newspaper (hereinafter referred to as" Peller "). There are four types (FIG. 4), and the guide roller conveys the paper so as not to be wrinkled on the paper surface and to prevent the paper surface from being contaminated with dirt that causes discomfort to the reader.

  As described above, the guide roller is required to have good paper transportability and non-contamination, and conventionally, the following has been proposed.

[Conventional example 1]
A conductive rubber layer in which a fluororesin and metal oxide fine particles are dispersed is provided on the surface of a roller base made of carbon fiber reinforced resin (see, for example, Patent Document 1)

[Conventional example 2]
By forming a mixture layer of resin and fine aggregate on the surface of a roller base made of carbon fiber reinforced resin, the surface is made to be a micro uneven surface, and ceramics are sprayed thereon, and further non-adhesive silicone is formed thereon. Resin-coated (for example, see Patent Document 2)

[Conventional Example 3]
The surface of the roller base material made of carbon fiber reinforced resin was covered with a metal cylinder, and the outer peripheral surface of the metal cylinder was formed by mixing a large diameter peripheral surface portion and a small diameter peripheral surface portion, and a chromium plating layer was formed thereon. Things (see, for example, Patent Document 3)

[Conventional example 4]
As a roller base material, a roller base material made of carbon fiber reinforced resin that exists in a state where a plurality of large-diameter peripheral surface portions and a plurality of small-diameter peripheral surface portions are arranged adjacent to each other on the peripheral surface is used. A mixture layer of resin and fine aggregate is formed to make the surface a micro uneven surface, ceramics is sprayed thereon, and non-adhesive silicone resin is further coated thereon (see, for example, Patent Document 4)
Japanese Patent Laid-Open No. 11-82476 Japanese Patent Laid-Open No. 9-175703 JP-A-6-106702 Japanese Patent Laid-Open No. 11-165930

  Among the above-mentioned conventional examples, in Conventional Example 1 and Conventional Example 3, since the roller surface is a rubber layer or a chrome plating layer, the non-adhesiveness of the roller surface is low and easily contaminated with ink. After printing the newspaper, it is necessary to wash the surface with washing oil (white kerosene). Since a newspaper rotary press uses as many as 100 to 300 guide rollers per unit, some of the workers have a large cleaning work load.

  On the other hand, in the conventional example 2, since the silicone resin is coated on the roller surface, the non-adhesiveness is superior to the rollers of the conventional examples 1 and 3. However, in Conventional Example 2, since the entire roller has the same diameter and is in contact with the paper surface as a whole, ink or paper dust tends to adhere to the roller surface. When the surface becomes slightly dirty, the frictional force on the surface slightly increases, and the amount of ink or paper dust adhering to the roller increases more than the amount of ink or paper dust adhering to the roller that is reversely transferred to the paper surface. Finally, there is a problem that a large amount of ink or paper dust adhering to the roller surface partially stains the paper surface, and a larger frictional force partially occurs, causing wrinkles on the paper surface. There is. For this reason, as a washing cycle, the roller surface is usually washed with washing oil (white kerosene) or the like every week.

  The roller of Conventional Example 4 is an improvement of these rollers to reduce the cleaning cycle, and the slip property (slidability) is reduced by the difference in diameter between the large diameter peripheral surface portion and the other small diameter peripheral surface portions. In addition to reducing frictional force by improving the surface, both the large-diameter peripheral surface and the small-diameter peripheral surface are coated with a non-adhesive material such as silicone resin on the surface to prevent premature roller contamination. However, the large-diameter peripheral surface portion is disposed not only on the unprinted portions at both ends and the center portion of the spread of the newspaper, but also in the printed portion in the vicinity thereof. This is to ensure that the large-diameter circumferential surface portion comes into contact with both ends of the A-winding or the D-winding at the time of carrying the A-winding and the D-winding in consideration of the lateral fluctuation of the newspaper. However, in the large-diameter peripheral surface portion that comes into contact with the printed portion, the stain due to the adhesion of ink or paper powder gradually increases as the number of printed copies of the newspaper increases. This is because the slip property between the large-diameter peripheral surface portion and the newspaper surface is gradually lowered. That is, in the roller of the conventional example 4, when the roller is in a clean state, the large diameter peripheral surface portion and the small diameter peripheral surface are prevented in addition to the action of preventing ink and paper dust from being smeared with the newspaper surface of the large diameter peripheral surface portion. Prevents ink and paper dust from smearing due to slippage from the newspaper due to the difference in diameter of the surface, and prevents the ink and paper dust from being smeared by non-adhesive materials such as silicone resin at the small diameter peripheral surface of the roller. However, as the number of printed copies of the newspaper increases, stains due to adhesion of ink and paper dust increase on the large-diameter peripheral surface portion, and the slip property between the newspaper surface and the large-diameter peripheral surface portion gradually decreases, so the newspaper surface on the small-diameter peripheral surface portion The slip property with the gradual decrease. This is because slippage between the newspaper surface and the newspaper surface due to the difference in diameter between the large-diameter circumferential surface portion and the small-diameter circumferential surface portion, as well as the newspaper surface of the small-diameter circumferential surface portion due to slippage between the large-diameter circumferential surface portion and the newspaper surface. Since both of the functions of strengthening the slip property prevent the guide roller from becoming dirty, if the slip property of the newspaper surface and the large-diameter peripheral surface portion gradually decreases, the slip property of the small-diameter peripheral surface portion also gradually decreases. It is to do. For this reason, the stain due to the adhesion of ink and paper powder gradually increases as the number of newspaper prints increases, and there is a problem that the roller surface becomes dirty in a relatively short period of time.

  The problem to be solved by the present invention is to maintain a high slip property and non-adhesiveness between the roller surface and the newspaper surface for a long period of time, and to prevent roller contamination for a long period of time.

  The light weight non-adhesive guide roller of the present invention is a roller base material other than a part where a fluororesin tube is crimped to at least both ends and a central part of a carbon fiber reinforced resin roller base material. By forming a mixture layer of resin and fine aggregate on the surface, the surface is made into a micro uneven surface, and further, a non-adhesive resin is coated on the micro uneven surface.

  Here, the fluororesin is originally excellent in slipping property (sliding property) and non-adhesiveness, but in the present invention, the sliding friction coefficient with the newspaper surface is 0.300 or less (Shinto Scientific Co., Ltd. “HEIDEN Tribogear Muse TYPE: It is preferable to use the one having a coefficient of static friction measured by “951”.

  In the present invention, it is preferable that the outer diameters of the fluororesin tube portions after the fluororesin tube is pressure-bonded are all the same.

  In this configuration, the outer diameter of the non-adhesive resin part after coating with the non-adhesive resin is smaller than the outer diameter of the fluororesin tube part after crimping the fluororesin tube, and the non-adhesive resin is The non-adhesive resin part after coating is preferably formed in a tapered shape that gradually decreases in diameter toward the middle part in the longitudinal direction.

  Furthermore, in this configuration, the step between the fluororesin tube portion after crimping the fluororesin tube and the intermediate portion in the longitudinal direction of the non-adhesive resin portion after coating the non-adhesive resin is 0.1 mm to It is preferable to be in the range of 0.5 mm.

  Further, in the present invention, the outer diameter of the fluororesin tube part after the fluororesin tube is pressure-bonded is all the same, and the outer diameter of the non-adhesive resin part after coating the non-adhesive resin is fluororesin The outer diameter of the fluororesin tube part after crimping the tube made of plastic is made smaller and the outer diameters are all the same. The level | step difference between the non-adhesive resin parts after coating can be made into the range of 0.1 mm-0.5 mm.

  In the present invention, the resin constituting the mixture layer of resin and fine aggregate is composed of one or more of epoxy resin, urethane resin, acrylic resin, polyester resin and alkyl silicate resin, and the fine aggregate is , One or more of hard plastic powder, metal oxide powder and carbide. The fine aggregate particle size is in the range of 10 μm to 44 μm, the thickness of the resin and fine aggregate mixture layer is in the range of 50 μm to 150 μm, and the surface roughness (Rz) is in the range of 20 to 80 μm. It is preferable to do.

  Furthermore, the non-adhesive resin to be coated in the present invention is preferably a silicone resin, and the surface roughness (Rz) is preferably in the range of 10 to 20 μm.

  Furthermore, in this invention, it is preferable that the crimping | compression-bonding width | variety of a fluororesin tube shall be the range of 40 mm-80 mm.

  The lightweight non-adhesive guide roller of the present invention configured as described above is suitably used for a printing press such as a newspaper rotary press or an offset rotary press.

  The present invention will be described in more detail. The position of pressure bonding of the fluororesin tube to the roller base material reliably conveys all the paper width dimensions such as A winding, C winding, D winding, and peller, and the ink What is necessary is just to make it at least both ends and a center part as a position which does not increase the stain | pollution | contamination of paper dust. Moreover, as shown in FIG. 4, if the fluororesin tube 2 is pressure-bonded to the intermediate portion between the end portion and the central portion in addition to the both end portions and the central portion, even the peller can be reliably conveyed. Thus, it is preferable that the crimping | compression-bonding position of the fluororesin tube is a position through which the unprinted portion and the periphery of both ends or the central portion of the newspaper surface pass.

  Between the fluororesin tube surface (the fluororesin tube portion after the fluororesin tube is crimped) and the other non-adhesive resin coating layer surface (the non-adhesive resin portion after the non-adhesive resin is coated) As for the step, the fluororesin tube surface is preferentially in contact with the newsprint surface when the newsprint surface passes, and the fluororesin is used to reduce the frictional force between the guide roller and the newsprint surface (good slipperiness). It is preferable to make the surface of the tube made slightly protrude from the surface of the non-adhesive resin coating layer. That is, as described above, the outer diameter of the non-adhesive resin portion after coating the non-adhesive resin is preferably smaller than the outer diameter of the fluororesin tube portion after the fluororesin tube is pressure-bonded. For the tapered roller shown in FIG. 3, the steps on the surface of the fluororesin tube portion at the both ends and the central portion of the maximum diameter portion and the non-adhesive resin coating layer surface of the minimum diameter portion are 0.1 mm to 0 in thickness. It is preferable to be in the range of .5 mm. More preferably, the range is 0.1 mm to 0.3 mm. In the stepped straight roller shown in FIG. 1, the step between the large-diameter fluororesin tube and the small-diameter non-adhesive coating is preferably 0.1 mm to 0.5 mm in thickness. More preferably, the range is 0.1 mm to 0.3 mm.

  If the amount of protrusion on the fluororesin tube surface exceeds 0.5 mm, the stepped straight roller (Fig. 1) will have ink or paper dust on the boundary between the edge of the fluororesin tube and the non-adhesive resin coating layer. There is concern about the occurrence of dirt due to accumulation, which may stain the newspaper. In addition, a large space is formed between adjacent fluororesin tubes, and depending on the printed matter, the newspaper will stretch when there is a large amount of water, so the newspaper will flutter on the guide roller and will not stick to the newspaper surface. The slip effect between the resin coating layers cannot be exhibited well, and the guide roller is soiled or wrinkled. On the other hand, with regard to the tapered roller (FIG. 3), depending on the elongation of the newspaper, from the maximum diameter portion to the minimum diameter portion, there will be a sag of the newspaper. It is not preferable because it is not spread out and there is concern about the occurrence of paper wrinkles.

  On the other hand, if the projection of the fluororesin tube is less than 0.1 mm, neither the stepped straight roller nor the tapered roller can sufficiently exhibit the slip effect due to the difference in diameter between the large diameter portion and the small diameter portion, and the guide roller The anti-smudge effect depends only on the slip property between the large-diameter fluororesin tube section and the newspaper surface. To maintain the anti-stain effect for a long time, the diameter of the large-diameter part and the small-diameter part Since the effect becomes higher when the slip property due to the difference and the slip property of the fluororesin tube portion of the large diameter portion and the newspaper surface are combined, the step between the large diameter portion and the small diameter portion is preferably 0.1 mm or more.

  In general, a period of 5 years or more is considered from the installation to the removal of the guide roller. During that period, the non-adhesive resin coating layer of the small diameter portion was adhered when washed with an oil-based solvent such as washing oil (white kerosene). If the solvent is insufficiently wiped, a portion of the solvent impregnates the inside of the non-adhesive resin, and then the surface of the non-adhesive resin coating layer where the paper dust and ink that swells the guide roller is swollen Enter inside. As a result, the components constituting dirt remain on the surface of the non-adhesive resin coating layer even after washing, and the non-adhesiveness is slightly reduced. Therefore, the slip property and fluorine due to the difference in diameter between the large diameter portion and the small diameter portion described above. It is preferable to use the composite effect of slipping between the resin tube and the newspaper surface in order to maintain the effect for a long period of time.

  The reason why the pressure bonding width of the fluororesin tube is 40 mm to 80 mm is as follows. First, if the crimping width is more than 80 mm, the amount of water applied to the newspaper surface varies depending on the area ratio of the pattern to be printed, so the elongation of the newspaper is not constant, and the newspaper surface may be received only by the large diameter part, Since the small diameter portion is less frequently in contact with the newspaper surface, the thinly adhered ink is not transferred to the newspaper surface, and the ink adhered to the surface of the small diameter portion is cured over time, and the ink / paper powder is fixed. . Once in such a state, the area ratio of the printed pattern increases, the amount of water applied increases, the newspaper grows, the newspaper surface comes into contact with the small diameter portion, and the slip force between the small diameter portion and the newspaper surface becomes smaller. Even if it recovers, it becomes difficult to peel off the adhered ink / paper powder from the surface of the small-diameter portion by the slip force, and ink / paper powder further accumulates on the surface of the small-diameter portion, so that the guide roller is stained early. On the other hand, when the diameter is less than 40 mm, the small-diameter portion receiving the newspaper surface is thinly stained on the surface as the number of newspaper prints increases, so that the friction coefficient of the small-diameter portion is initially 0.3 to 0.4 (Shinto Kagaku An example of soiling that was about “HEIDEN Tribogear Muse TYPE: 951” is 0.6 (static coefficient of friction measured by Shinto Science Co., Ltd. “HEIDEN Tribogear Muse TYPE: 951”) or more. Therefore, the slip property with the newspaper surface due to the difference in diameter between the large diameter portion and the small diameter portion is reduced. As the ratio of the small diameter portion increases in the contact ratio between the small diameter portion and the large diameter newspaper surface, the slip property with the newspaper surface decreases significantly, and the ink / paper dust adhered to the small diameter portion is removed. It becomes insufficient and dirt starts to accumulate. Here, the slip property with the newspaper surface of the fluororesin tube of the large diameter portion always functions during newspaper printing, but the ratio of the small diameter portion is the contact ratio between the large diameter portion and the small diameter portion newspaper paper surface. When it increases and the ratio of a large diameter part falls, the slip property of a large diameter part and a newspaper surface also falls. Therefore, when the above-described large diameter portion is less than 40 mm, slippage between the newspaper and the newspaper due to the difference in diameter between the large diameter portion and the small diameter portion is reduced, and the width of the large diameter portion occupying the entire guide roller is reduced. This is not preferable because the guide roller is soiled at an early stage due to the occurrence of both problems such as a decrease in slipping property with the newspaper surface due to an increase in the thickness of the guide.

  As the non-adhesive resin constituting the non-adhesive resin coating layer, it is preferable to use a silicone resin having high non-adhesiveness to ink or paper powder. Among these, a condensation reaction type silicone resin having a relatively high surface slipperiness is preferable. However, in the condensation reaction type silicone resin, the silicone rubber is inferior in slipperiness, so that it is inferior in the ability to immediately reverse transfer the adhered ink or paper powder onto the newspaper surface, and paper wrinkles may occur, which is not preferable.

  Further, when the surface roughness (Rz) of the non-adhesive resin coating layer is more than 20 μm, the undried ink constituting the letters and patterns on the newspaper is caused by the convex portions on the guide roller surface coming into point contact with the newspaper and slipping. This is not preferable because the convex portion is scraped off and the surface of the guide roller becomes dirty early. On the other hand, when the surface roughness (Rz) is less than 10 μm, the entire guide roller surface comes into contact with the newspaper surface, so that when the undried ink partially adheres to the guide roller surface, the slip effect with the newspaper surface decreases, Since the undried ink gradually adheres and grows over the entire surface, the stain speed of the guide roller is smaller than that in the case where the surface roughness (Rz) exceeds 20 μm, but the guide roller stain prevention period is shortened. Also, the amount of non-adhesive resin coating increases, and the diameter after coating increases, and the difference in diameter between the fluororesin tube and the non-adhesive resin coating layer fluctuates. Since the difference may be small, it is not preferable.

  Since the non-adhesive resin such as a condensation reaction type silicone resin constituting the non-adhesive resin coating layer and the roller base material made of carbon fiber reinforced resin have low adhesion, in the present invention, the resin is applied to the surface of the roller base material. Then, a fine aggregate mixture layer is coated as a base layer to form a micro uneven surface on the surface.

  The film thickness of the mixture layer for forming the minute uneven surface is preferably in the range of 50 μm to 150 μm. If the thickness exceeds 150 μm, the thickness of the upper non-adhesive resin layer is also added, so the diameter of the fluororesin tube portion needs to be increased more than necessary. If the particle size is less than 50 μm, the fine aggregate has a maximum particle size of 44 μm, and considering the resin layer covering the fine aggregate, calculation is possible, but it is not preferable because it is difficult in practice.

  In addition, the surface roughness (Rz) of the minute uneven surface is preferably in the range of 20 μm to 80 μm. When the surface roughness (Rz) of the minute uneven surface is more than 80 μm, it is necessary to increase the thickness of the non-adhesive resin coating layer more than necessary. Moreover, since the thickness of the non-adhesive resin coating layer may be larger than the diameter of the portion to which the fluororesin tube is crimped, it is not preferable. On the other hand, if the surface roughness (Rz) is less than 20 μm, the fine aggregate has a maximum particle size of 44 μm. Considering the resin layer covering this fine aggregate, it is possible to calculate, but in actual construction Is not preferable because it is difficult.

  In order to satisfy the surface roughness (Rz) range of 20 μm to 80 μm of the fine uneven surface, the size of the fine aggregate is preferably in the range of particle size of 10 μm to 44 μm. If the particle size exceeds 44 μm, the variation in the diameter of the guide roller may increase, which is not preferable. On the other hand, when the particle size is less than 10 μm, it is effective for dispersing inside the resin and strengthening the hardness of the resin, but it is not preferable because it does not function as a fine aggregate forming a rough surface. In order to form a rough surface and to reduce variation in diameter after resin formation, a preferable film thickness range is 50 μm to 100 μm.

  As for the shape of the guide roller, the portion other than the fluororesin tube is basically a straight shape. For example, the roller disposed immediately after the ink is printed by attaching water to the surface of the newspaper, the newspaper is configured according to the paper surface configuration. Since the wrinkles of the newspapers are different and the occurrence of paper wrinkles is expected due to the flickering of the newspaper, the central part is made 0.4 mm smaller in diameter than the end part as an inverted crown shape. It is preferable to enable processing to extend outward from the part. Note that the guide roller may be divided into two regions in the axial direction, and each region may have an inverted crown shape. In this case, in each region, an intermediate portion between the end portion and the central portion of the roller is made smaller by about 0.4 mm than the end portion and the central portion by a diameter difference. Such a reverse crown shape is effective for A winding, C winding, and D winding according to the paper width dimension.

  According to the present invention, the adhesion of ink and paper dust to the guide roller is reduced, so that the burden on the cleaning and cleaning of the operator can be reduced. Reversely transferred to the paper. In other words, because of the non-adhesiveness of the guide roller surface, the ink or paper dust adhering to the guide roller surface is peeled off from the guide roller when the guide roller and the newspaper surface slip, and the newspaper surface from the non-adhesive resin surface. It becomes easy to adhere to. Therefore, the guide roller of the present invention is such that the deposits adhering to the guide roller and accumulated as they are are reversely transferred as black spots on the newspaper surface, making it impossible to read the characters on the newspaper surface, or being reversely transferred to the pattern portion. This makes it possible to reduce the occurrence of stains and paper wrinkles due to the reverse transfer of ink onto the newspaper due to black spots.

  Hereinafter, embodiments of the present invention will be described by way of examples.

  FIG. 1 schematically shows a cross-sectional structure of a stepped straight guide roller according to Embodiment 1 of the present invention. FIG. 2 schematically shows an enlarged cross-sectional structure shown in FIG.

  First, both ends and the center of the surface of the roller base material 1 made of carbon fiber reinforced resin having a diameter of 100 mm were polished. The polishing width and depth were 75 mm wide and 0.3 mm deep at both ends, and 50 mm wide and 0.3 mm deep at the center. Next, a 0.6 mm-thick fluororesin tube 2 (for example, PFA (tetrafluoroethylene / perfluoroalkoxyethylene copolymer), PTFE (tetrafluoroethylene) or FEP (ethylene tetrafluoride)) is applied to the polished portion. -A hexafluoropropylene copolymer) and the like were mounted, heated at a temperature of 70 to 100 ° C., shrunk and pressure-bonded. Further, by forming the mixture layer 3 of the epoxy resin 3a and the alumina powder 3b (particle size: 10 μm to 44 μm) on the surface of the roller base 1 other than the portion where the fluororesin tube 2 is pressure-bonded, a minute uneven surface is formed on the surface. 3c was formed. Specifically, 50% by mass of alumina powder is mixed with 33% by mass of epoxy resin and 17% by mass of dilution thinner, and coating is performed on the surface of the roller base 1 so that the film thickness is 100 μm by air spraying. After that, the fine uneven surface 3c was formed on the surface of the mixture layer 3 by heating and curing at 80 ° C. for 30 minutes. At that time, the surface roughness (Rz) of the micro uneven surface 3c was 21 μm. And after spray-coating a condensation reaction type silicone resin on this micro uneven surface 3c so that the surface roughness (Rz) becomes 10 μm to 15 μm, it is cured by heating at 80 ° C. to 130 ° C. for 30 minutes to make a non-adhesive resin. Layer 4 was formed. The thickness of the non-adhesive resin layer 4 was 20 μm. The stepped straight guide roller produced in this way was attached to a newspaper rotary press as Example 1, and the anti-staining effect was investigated.

  FIG. 3 schematically shows a cross-sectional structure of a two-part inverted crown guide roller according to Embodiment 2 of the present invention.

  First, the both ends and the center of the surface of the roller base material 1 made of carbon fiber reinforced resin having a diameter of 100 mm are polished. The depth was 0.4 mm. Next, a 0.6 mm-thick fluororesin tube 2 (equivalent to Example 1) was attached to the polished portion, heated at a temperature of 70 to 100 ° C., shrunk, and pressure-bonded. Further, with respect to the portion other than the portion where the fluororesin tube 2 is crimped, as shown in FIG. 3, from the middle portion between the central portion and the end portion of the roll base 1, the central portion or the end fluororesin Grinded into an inverted crown shape over the edge portion of the tube 2 and the difference between the diameter of the intermediate portion between the central portion and the end portion and the diameter of the fluororesin tube portion at both ends and the central portion is 0.8 mm. I did it.

  Then, as in Example 1, the mixture layer 3 of epoxy resin and alumina powder (particle size: 10 μm to 44 μm) is formed on the surface of the roller base material 1 other than the portion where the fluororesin tube 2 is crimped. A minute uneven surface 3c was formed on the surface. Specifically, 50% by mass of alumina powder is mixed and stirred with 33% by mass of epoxy resin and 17% by mass of dilution thinner, and the surface of the roller base 1 is coated with air spray so that the film thickness becomes 115 μm. After that, the fine uneven surface 3c was formed on the surface of the mixture layer 3 by heating and curing at 80 ° C. for 30 minutes. At this time, the surface roughness (Rz) of the minute uneven surface 3c was 32 μm. And after spray-coating a condensation reaction type silicone resin on this micro uneven surface 3c so that the surface roughness (Rz) becomes 10 μm to 15 μm, it is cured by heating at 80 ° C. to 130 ° C. for 30 minutes to make a non-adhesive resin. Layer 4 was formed. The thickness of the non-adhesive resin layer 4 was 35 μm.

  As shown in FIG. 3, the non-adhesive resin portion to which the fluororesin tube 2 is not crimped is gradually reduced in diameter toward the middle portion in the longitudinal direction of the two-divided inverted crown guide roller manufactured in this way. Taper shape. And the level | step difference between the fluororesin tube part and the intermediate part of the longitudinal direction of a non-adhesive resin part will be 0.25 mm. This two-part inverted crown guide roller was attached to a newspaper rotary machine as Example 2 to investigate the antifouling effect.

  Further, in order to examine the effect of the guide roller of the present invention, a guide roller according to the prior art was manufactured and used as a comparative example.

[Comparative Example 1]
FIG. 5 schematically shows a cross-sectional structure of the straight guide roller of Comparative Example 1.

  In accordance with the conventional example 2 described above, a resin and fine aggregate mixture layer 3 is formed on the surface of the roller base material 1 made of carbon fiber reinforced resin, so that the surface becomes a micro uneven surface 3c, and ceramics are formed thereon. Thermal spraying was performed to form a thermal spray layer 5, and a non-adhesive silicone resin was further coated thereon to form a non-adhesive resin layer 4. This straight guide roller was attached to a newspaper rotary machine as Comparative Example 1, and the anti-staining effect was investigated.

[Comparative Example 2]
The two-divided inverted crown guide roller of Comparative Example 2 is similar to the tapered roller of Example 2, and has no fluororesin tube crimped at both ends and the center portion. Of the both ends and the central portion of the surface of the roller base material 1 made of carbon fiber reinforced resin having a diameter of 100 mm, the width 75 mm is left at both ends and the width 50 mm is left at the central portion. Grinding into a reverse crown shape from the middle part equidistant from the center part and the end part of the material to the center part or the edge part of the end part, the diameter and both end parts of the intermediate part between the center part and the end part, and The difference in diameter from the central part was set to 0.8 mm.

  Then, in the same manner as in the treatment of the part where the fluororesin tube of Example 1 is not mounted, by forming a mixture layer of epoxy resin and alumina powder (particle size: 10 μm to 44 μm) on the surface, minute irregularities are formed on the surface. A surface was formed. Specifically, 50% by mass of alumina powder was mixed and stirred with 33% by mass of epoxy resin and 17% by mass of dilution thinner, and the surface of the roller base material was coated with air spray so as to have a film thickness of 150 μm. Then, it was heat-cured at 80 ° C. for 30 minutes to form a micro uneven surface on the surface of the mixture layer. At that time, the surface roughness (Rz) of the fine uneven surface was 36 μm. And after spray-coating the surface roughness (Rz) of 10 μm to 15 μm with a condensation reaction type silicone resin on this micro uneven surface, it is heated and cured at 80 ° C. to 130 ° C. for 30 minutes to form a non-adhesive resin layer. Formed. The two-part inverted crown guide roller manufactured in this way was attached to a newspaper rotary machine as Comparative Example 2, and the anti-staining effect was investigated.

[Comparative Example 3]
FIG. 6 schematically shows a cross-sectional structure of a straight guide roller of Comparative Example 3.

  In accordance with Conventional Example 1 described above, conductive rubber layer 6 in which a fluororesin and metal oxide fine particles were dispersed was formed on the surface of roller base material 1 made of carbon fiber reinforced resin. This straight guide roller was attached to a newspaper rotary machine as Comparative Example 3, and the anti-staining effect was investigated.

  Table 1 shows the measurement results of the dirt condition on the roller surface in each of the above examples and comparative examples. In Table 1, “stepped straight” in the roller shape column means the shape shown in FIG. 1, and “two-divided inverted crown” means the shape shown in FIG. “Straight” means a simple cylindrical shape.

  In comparison between Example 1 and Example 2- (1) shown in Table 1 and Comparative Example 1 and Comparative Example 2, the state of contamination on the roller surface after printing 1 million copies is as follows. Stain was not seen on the tube-made tube part, and the surface of the non-adhesive resin part was partially spotted with spotted ink and paper dust, but overall there was very little stain. Further, in the roller of Example 2- (1), the fluororesin tube portion was hardly soiled as a whole, and the slip mark was only seen thinly in a streak shape on the surface of the non-adhesive resin portion. . On the other hand, in Comparative Example 1, the entire roller is soiled with ink and paper dust and needs to be washed with washing oil (white kerosene). In the roller of Comparative Example 2, the entire roller is thinly covered with ink and paper dust. Adhered dirt was seen.

  On the other hand, in the comparison between Example 2- (2) and Comparative Example 3 shown in Table 1, the state of contamination on the roller surface after 300,000 copies was printed was a fluororesin tube for the roller of Example 2- (2). The part was hardly soiled as a whole, and the slip marks were only seen as thin streaks on the surface of the non-adhesive resin part. On the other hand, the roller of Comparative Example 3 was in a state that the ink on the surface and the adhering stain of the paper powder were severely required to be cleaned even immediately. Even when the roller of Example 2- (2) was used for about 1 month without printing up to a print number of 5,600,000, the non-adhesive resin portion was less contaminated and was not cleaned.

As described above, the excellent antifouling effect of the guide roller of the present invention was proved.

1 schematically shows a cross-sectional structure of a guide roller according to Embodiment 1 of the present invention. 1 schematically shows an enlarged cross-sectional structure shown in FIG. The cross-sectional structure of the guide roller which concerns on Example 2 of this invention is shown typically. The conveyance situation of the newsprint paper by the guide roller of this invention is typically shown. The cross-section of the guide roller of the comparative example 1 is typically shown. The cross-sectional structure of the guide roller of the comparative example 2 is shown typically.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Roller base material made from carbon fiber reinforced resin 2 Fluororesin tube 3 Mixture layer of resin and fine aggregate 3a Epoxy resin (resin)
3b Alumina powder (fine aggregate)
3c Micro uneven surface 4 Non-adhesive resin layer 5 Thermal spray layer 6 Conductive rubber layer

Claims (9)

  A fluororesin tube is pressure-bonded to at least both ends and the center of a carbon fiber reinforced resin roller base material, and a resin and fine aggregate mixture layer is formed on the surface of the roller base material other than the portion where the fluororesin tube is pressure-bonded. A lightweight non-adhesive guide roller formed by forming a surface with a micro uneven surface and coating a non-adhesive resin on the micro uneven surface.   The lightweight non-adhesive guide roller according to claim 1, wherein the outer diameters of the fluororesin tube portions after the fluororesin tube is pressure-bonded are all the same.   The outer diameter of the non-adhesive resin part after coating with the non-adhesive resin is smaller than the outer diameter of the fluororesin tube part after crimping the fluororesin tube, and after the non-adhesive resin is coated The lightweight non-adhesive guide roller according to claim 2, wherein the non-adhesive resin portion is formed in a tapered shape that gradually decreases in diameter toward an intermediate portion in a longitudinal direction thereof.   The level difference between the fluororesin tube part after crimping the fluororesin tube and the intermediate part in the longitudinal direction of the non-adhesive resin part after coating with the non-adhesive resin is in the range of 0.1 mm to 0.5 mm. The lightweight non-adhesive guide roller according to claim 3.   The outer diameter of the fluororesin tube part after crimping the fluororesin tube is the same, and the outer diameter of the non-adhesive resin part after coating with the non-adhesive resin is the same after the fluororesin tube is crimped Non-adhesive resin after coating the fluororesin tube part after the fluororesin tube is crimped and the non-adhesive resin. The lightweight non-adhesive guide roller according to claim 1, wherein a level difference between the first and second portions is in a range of 0.1 mm to 0.5 mm.   The resin constituting the mixture layer of resin and fine aggregate is one or more of epoxy resin, urethane resin, acrylic resin, polyester resin and alkyl silicate resin, and the fine aggregate is hard plastic powder, metal It is composed of one or more of oxide powder and carbide, the fine aggregate has a particle size in the range of 10 to 44 μm, the thickness of the resin and fine aggregate mixture layer is 50 μm to 150 μm, and The lightweight non-adhesive guide roller according to claim 1, wherein the surface roughness (Rz) is in the range of 20 to 80 μm.   The lightweight non-adhesive guide roller according to any one of claims 1 to 6, wherein the coated non-adhesive resin is made of a silicone resin and has a surface roughness (Rz) in the range of 10 to 20 µm.   The lightweight non-adhesive guide roller according to any one of claims 1 to 7, wherein a pressure-bonding width of the fluororesin tube is in a range of 40 mm to 80 mm.   The lightweight non-adhesive guide roller according to any one of claims 1 to 8, which is used in a printing press such as a newspaper rotary press or an offset rotary press.

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