JP5362285B2 - Adsorption roll - Google Patents

Description

The present invention relates to a suction roll for conveying and guiding a web that requires delicate handling, such as a thin band-shaped organic film or a metal foil, in a suction state and performing various treatments.

As a suction roll that conveys and guides the web in the suction state, the "through-hole type" is generally used in which the inside of the suction roll is decompressed and suction is performed using a number of holes provided on the surface of the suction roll communicating therewith. It is. Patent Document 1 discloses this through-hole type adsorption roll. In the through-hole type, the portion where the web contacts the hole portion is concave and the periphery thereof is pulled, so that wrinkles are likely to occur and is not suitable for processing the web.

  Patent Document 2 discloses a roll in which a number of porous ceramics are embedded in a part of a portion of an adsorbing roll in contact with the web. This technique is proposed so that the webs are aligned in the longitudinal direction of the suction roll. Since the porous ceramic part and the metal part of the suction roll body are different in material and surface roughness, the unevenness of the web surface cannot be eliminated by uniform adsorption or transfer from the porous ceramic surface. Moreover, a mechanism for adsorbing only a part of the adsorbing roll as shown in 27 and 28 in the representative drawing is required. This is a necessary mechanism because of a large inflow (leakage) of air from the porous ceramic in a portion that is not necessary for suction, and it is expensive.

  Patent Document 3 discloses a roll in which a porous ceramic is formed on a roll surface by thermal spraying, and a resin film is further formed thereon. In this invention, although the porous ceramic is formed on the roll surface, it is not adsorbed from the inside of the roll, and the surface formed by thermal spraying cannot be said to have a sufficiently low surface roughness.

Japanese Patent Laid-Open No. 05-262445 JP 2004-26348 A Japanese Patent Laid-Open No. 08-12151

In recent years, there is an increasing number of apparatuses that perform processing such as printing, coating, transfer, and inspection on a web while being fed using an adsorption roll. As an example, an apparatus for performing the above-described processing is installed at a position indicated by A in FIG. 2 to perform processing or inspection on a portion of the web adsorbed by the suction roll.
In recent years, the accuracy and uniformity of the processing are required to be greatly improved. In the technique shown in the prior art, when the web is considered to be a sucked surface, the web is uniformly sucked due to the difference in the roll material and the presence of the through-hole portion, It is difficult to perform various processes, and none of them can be solved by the prior art.
The problem to be solved by the present invention is to improve the suction roll so that the web is kept in a very uniform and smooth state in web suction, transport guidance and processing.

The problem described above was solved by making the adsorbing roll a cylindrical porous ceramic sintered body having fine open pores that are in constant communication. Further, the surface roughness of the surface in contact with the web can be made sufficiently low, and since there is no large unevenness as in the through-hole type, the web can be held, transported and processed in a uniform state.
The present invention is an adsorption roll that adsorbs and conveys a belt-like web on the roll surface by reducing the pressure inside the roll to below atmospheric pressure, and at least a portion in contact with the belt-like web is formed from a cylindrical porous ceramic sintered body. It is an adsorption roll. Since the portion in contact with the web is a cylindrical porous ceramic sintered body and can be uniformly adsorbed from all the fine pores in contact with the web, the web being fed can be fed in a uniform state. This is not possible with a roll partially made of a porous body or a through-hole type adsorption roll. Moreover, since it is ceramic, there is almost no influence of wear and corrosion even if it is used for a long time. Furthermore, ceramics are suitable for high temperature applications because of their excellent heat resistance.

Suction roll ratio of the thickness of the radius and the cylindrical porous ceramic sintered body of the roll is not less than 10, and it is preferable that the thickness of the cylindrical porous ceramic sintered body is 0.5mm or more . When a web is adsorbed by a reduced pressure inside the cylindrical porous ceramic sintered body, the adsorption force decreases as the thickness increases, and conversely, the adsorption force increases as the thickness decreases. By setting the ratio of the radius of the adsorption roll and the cylindrical porous ceramic sintered body to 10 or more and the thickness of the cylindrical porous ceramic sintered body to a certain thickness or less, the cylindrical porous ceramic sintered body having fine pores is obtained. Sufficient suction power can be obtained by ligation. If the ratio is less than 10, the adsorptive power may decrease. In addition, when the thickness is less than 0.5 mm, not only is it difficult to produce a cylindrical porous ceramic sintered body, but the rigidity is lowered accordingly, so that it is easily damaged. Therefore, a thickness of at least 0.5 mm or more is more desirable.

Surface roughness of at least a portion in contact with the web of the tubular porous ceramic sintered body, it is particularly good arithmetic average roughness Ra of said suction roll 1.5μm or less and the maximum height Rz is 15μm or less . In order to adsorb the web and keep the surface smooth and uniform, the effect is further enhanced by setting the center line average roughness Ra to 1.5 μm or less and the maximum surface roughness Rz to 15 μm or less. This is because when the thickness of the web is reduced, the surface state of the suction roll at the time of suction is transferred to the web, so that a sufficiently low surface roughness is required. When adsorbing a thin film, Ra is preferably 1.5 μm or less and Rz is 15 μm or less. The values of Ra and Rz are values according to the JIS standard 2001 version.

The cylindrical porous ceramic sintered body has an average pore diameter of 2 μm or less (excluding 0) at the outer peripheral portion in contact with the web and a porosity of 15 to 40%. At least the outer peripheral surface and the inner peripheral surface are formed by the pores. it is preferable in that said suction roll is breathable. If the porosity of the porous ceramic sintered body is less than 15%, it is difficult to obtain continuous open pores, and a higher performance vacuum pump or the like is required to increase the adsorption power. On the other hand, if it is larger than 40%, pressure leaks easily from a portion not in contact with the web, and the area ratio of the suction surface to the outer peripheral surface needs to be higher than a certain level. In addition, the cylindrical porous ceramic sintered body can uniformly adsorb the entire surface because the continuous open pores exist uniformly in the entire sintered body. Further, in this case, when the average pore diameter is sufficiently small as 2.0 μm or less, even when the web is not adsorbed on the entire surface, for example, even when an area of about 1/10 of the surface area is adsorbed, There is very little leakage from this part and it can be almost ignored. Generally, in the case of an adsorbing roll, the web is adsorbed in an area of about 1/3 to 1/2 of the surface area of the cylindrical porous ceramic sintered body, so that a sufficient adsorbing force can be secured. If the average pore diameter exceeds 2.0 μm, leakage from a portion where the web is not adsorbed occurs, making it difficult to obtain a sufficient adsorbing force. The average pore diameter and porosity are values measured by mercury porosimetry.

The cylindrical porous ceramic sintered body is made of one or two of alumina, zirconia, silica, silicon carbide, yttria, magnesia, titanium carbide, titanium nitride, titanium carbide, tungsten carbide, silicon nitride, and aluminum nitride. It can be selected from ceramics based on the above . These ceramics are particularly suitable for use in the cylindrical porous ceramic sintered body of the suction roll of the present invention from the viewpoints of availability, low manufacturing cost, rigidity, wear resistance, corrosion resistance, heat resistance, etc. ing. As for the production, there are a method in which an organic substance is dispersed in a raw material powder and sintering, and a raw material powder, a composition, a sintering temperature and the like are adjusted so that complete densification does not occur.

Further, in the cylinder of the cylindrical porous ceramic sintered body, a substantially cylindrical reinforcing body is fitted, the inner peripheral portion of the cylindrical porous ceramic sintered body and the outer peripheral portion of the reinforcing member is joined together The aforementioned adsorbing roll is more desirable . It is particularly preferred invention further to at least one, or both a high porous ceramic sintered body the suction roll of the porosity or average pore diameter than the material the tubular porous ceramic sintered body of the reinforcement member . Used when the thickness of the cylindrical porous ceramic sintered body described so far cannot provide sufficient strength due to the necessity of suction force, roll size, rigidity, manufacturing cost, design, etc. be able to. By providing a substantially cylindrical reinforcing body on the inner surface (center of roll) side of the cylindrical porous ceramic sintered body, the disadvantage can be solved. This schematic diagram is shown in FIG. The substantially cylindrical reinforcing body is provided with a groove or notch for transmitting reduced pressure to the surface in contact with the web, or the reinforcing body itself is made porous so that negative pressure is exerted on the contact surface with the web. Can do. When the reinforcing body itself is made porous, a material having at least either a porosity or an average pore diameter larger than that of the cylindrical porous ceramic sintered body is preferable. As a result, since the flow rate of the gas flowing through the reinforcing body is larger than that of the cylindrical porous ceramic sintered body, the internal porous pressure can be reduced without any trouble without providing grooves and notches. It is transmitted to the union. In the case where the reinforcing body is made of a material whose porosity and average pore diameter are smaller than the cylindrical porous ceramic sintered body, it is necessary to provide grooves and notches as shown in FIG.
Wherein it is desired difference in thermal expansion coefficient of the reinforcing member and the thermal expansion coefficient of the tubular porous ceramic sintered body is 1.0 × 10 6 ^{(K -1)} or less. When the operating temperature is not room temperature or changes depending on the environment, the cylindrical porous ceramic sintered body and the reinforcing body are disconnected or broken by stress depending on the difference in thermal expansion coefficient. By making the difference in thermal expansion coefficient as small as 1 × 10 ⁻⁶ (K ⁻¹ ) or less as in the present invention, these problems are less likely to occur.

When the reinforcing body is used, it is desirable that the material of the reinforcing body is based on the same kind of ceramic as the cylindrical porous ceramic sintered body. By manufacturing the cylindrical porous ceramic sintered body and the reinforcing body with the same kind of ceramic base, the difference in thermal expansion between them can be further reduced. If the difference in thermal expansion is small, even when used in an environment other than room temperature, it is possible to further suppress peeling, breakage, deformation, etc. of both.
For example, for example, a cylindrical porous ceramic sintered body is combined with alumina ceramics having fine pores and fine pores and a dense alumina ceramic as a reinforcing body, or a cylindrical porous ceramic sintered body is combined with fine pores. A combination of silicon carbide ceramics having a porous structure and porous silicon carbide ceramics having relatively large communicating pores is also possible.
Further, in the method of joining together, it is desirable to bond with either a glass-based or organic-based adhesive . In order to integrate the cylindrical porous ceramic sintered body and the reinforcing body, methods such as shrink fitting, cold fitting, integral sintering, and diffusion bonding can be taken, but the most suitable are glass-based, ceramic Integration using organic or organic adhesives. Compared to other methods, there are few failures in the integration process, and it is most preferable in terms of cost and ease of manufacturing. In use, even when the use temperature is as high as 200 ° C., for example, a glass-based adhesive or an organic-based adhesive that can be used up to a high temperature can be used.

The reinforcing body has a shape obtained by scraping a part of a cylindrical shape, and at least a part of the shaved part applies a reduced pressure inside the roll to a part in contact with the web of the cylindrical porous ceramic sintered body and adsorbs the path. It is desirable to be a part of When a dense material is used for the reinforcing body, a cylindrical porous ceramic sintered body is sintered from the inside of the roll by cutting off a part of the substantially cylindrical reinforcing body, for example, as shown in FIG. Negative pressure can be exerted on the surface of the body that contacts the web.

By using the suction roll of the present invention for the suction roll that sucks and guides the web, the following 1. ~ 3. Can solve at least one of the following issues.

1. The entire web of the adsorbed part can be adsorbed uniformly. As a result, problems such as wrinkles and deformations in the web can be solved. Moreover, the web to adsorb | suck does not need to cover all the surfaces of a roll, and the freedom degree of a web shape and an adsorption | suction form is high.
2. The surface roughness of the surface of the suction roll can be reduced as compared with a suction roll using a conventional porous ceramic. Therefore, the phenomenon that the unevenness (surface roughness) of the suction surface is transferred to the web can be suppressed to a small level.
3. Due to the features 1 and 2, there is no deformation during web suction and feeding, and uniform suction can be achieved with good surface roughness. Therefore, processing such as printing, optical inspection, coating, and transfer can be performed with high quality during suction and conveyance guidance.

The best mode for carrying out the present invention will be described below.
First, the end portion 5 other than the adsorbing portion and the reinforcing body will be described with reference to FIG. 3, but can be made of a metal material such as an iron material or a ceramic material. In that case, what is necessary is just to manufacture with a general form also including the structure where both ends are integrated like FIG.
As for the negative pressure inside the roll, any conventionally used general method can be used. As a typical form, as shown in FIGS. 3 to 6, the internal gas can be moved from the hole portion near the center of the roll to an arbitrary position at the end of the roll by a decompression device such as a vacuum pump. What is necessary is just to provide in a state.

  There are no particular limitations on the fixing of the cylindrical porous ceramic sintered body to the end, such as fixing with an adhesive or fixing by mechanical means such as bolting. There is no problem if the end portion and the cylindrical porous ceramic sintered body are fixed so as not to move during use.

A cylindrical porous ceramic sintered body as shown in FIG. 7 is used. In order to obtain a cylindrical porous ceramic sintered body, first, a ceramic raw material powder and a molding binder are mixed in a dry or wet manner to obtain a desired powder, and then molded into a cylindrical shape. This molding can be obtained by packing the powder around the cylindrical core and pressing it with a rubber press or cold isostatic pressing. However, it is possible to perform extrusion molding. Depending on the shape, a die press may be used.
Next, after intermediate processing is performed on the pressed body, degreasing and sintering are performed. Degreasing is for removing the molding binder. Either degreasing and subsequent sintering may be performed, or degreasing and sintering may be performed continuously. Sintering is performed at a sintering temperature suitable for the ceramic material.
The obtained sintered body is machined so as to have a desired shape and size. Three major parts are required for the outer diameter, inner diameter, and end, and these are performed by various processing machines such as a cylindrical grinder, an internal grinder, a surface grinder, and a machining center. At this time, the outer shape is finished slightly larger than the desired dimension.
Next, a separately prepared roll end member and a cylindrical porous ceramic sintered body are integrated. The member at the end of the roll includes at least one portion for connecting the central portion of the roll with a vacuum pump that generates a negative pressure. Any method can be used for the integration, but the end of the cylindrical porous ceramic sintered body and its periphery may be fixed with an adhesive or may be fixed mechanically using a bolt or the like.

Finally, after integrating with a member such as a roll end member, the outer peripheral portion of the cylindrical porous ceramic sintered body is ground while rotating the entire roll. By doing so, the roundness, cylindricity and coaxiality of the entire roll and the cylindrical porous ceramic sintered body can be made sufficiently high.

  When the reinforcing body is used separately, the process is slightly different. After the internal grinding of the cylindrical porous ceramic sintered body, the number of steps for integrating with a separately prepared reinforcing body increases. For integration, means such as shrink fitting, cold fitting, diffusion bonding, and integral sintering can be used, but the method of integrating with an adhesive can be most easily performed.

After the integration, the end portion and the inner surface are processed together with the cylindrical porous ceramic sintered body. After this, it is the same as the case where a reinforcing body is not used.

In the following examples, several specific examples of the invention will be described, but the production method, usage method, and the like are not limited thereto.

Example 1
1. Production of Cylindrical Porous Ceramic Sintered Body Two types of alumina powder containing 0.25% magnesia component were prepared as raw material powders. The average particle diameter of each is (a) 2 μm and (b) 0.3 μm.

  These powders were mixed at a ratio of 80% by mass for (a) and 20% by mass for (b), and methanol was uniformly mixed with a solvent and polyethylene glycol, which was a molding binder, to obtain a mixed powder. After drying, the rubber core was filled with the steel core and the mixed powder around it, and after sealing, cold isostatic pressing was performed to obtain a cylindrical press body.

  The press body was put into a degreasing and sintering furnace, and degreased and sintered at 1,400 ° C. in an air atmosphere. When the sintered body was observed, fine open pores existed uniformly. When the pores were measured, the average pore diameter was 0.5 μm. The porosity was 20%.

A desired cylindrical alumina-based porous ceramic sintered body was obtained by using a cylindrical grinder, an internal grinder, and a cylindrical grinder on the end face, inner face, and outer face of the sintered body, respectively.
2. End of roll Separately, as shown in 5 of FIG. 3, a member at the end of the roll was prepared from chromium molybdenum steel. The member was provided with one vacuum evacuation hole 6.
3. Assembly 1. And 2. After the cylindrical porous ceramic sintered body 1 and the roll end member 5 prepared in the above are bonded with an epoxy adhesive, the end of the cylindrical porous ceramic sintered body is bonded to the roll end member. Dried for 1 day. Both were firmly integrated and the adsorption | suction roll shown in the schematic diagram 3 was obtained. Then, the outer peripheral part of the cylindrical porous ceramic sintered compact was finish-ground with the cylindrical grinder in the integrated state, and the adsorption | suction roll of this invention was obtained. This adsorption roll was designated as No. It was set to 1.

  As a comparative roll for the suction roll of the present invention, a “through hole” type suction roll in which a number of through holes of 0.5 mm are provided from the surface to the inner surface of the roll is used. It was set to 11.

Further, a roll corresponding to Patent Document 2 in which a number of porous ceramics (using alumina) is provided on the surface of a metal roll is No. 1. It was set to 12.

  No. 1, no. 11 and no. As shown in FIG. 2, using 12 rolls, a pattern printing process was performed with a metal containing ink on polyimide by another roll during suction and conveyance guidance, using polyimide having a thickness of 0.025 mm as a web 9. In this case, a printing roll enters the portion indicated by A in FIG. This printing form is shown in FIG.

  No. of the present invention. In order to keep the entire roll uniformly, the roll No. 1 had no defect in the printed pattern, and an accurate pattern printing could be obtained over a long period of time.

  No. which is a comparative example. It was found that the roll No. 11 was not suitable for high-precision printing because a pattern distortion of about several tens to 10 μm occurred in printing around the portion corresponding to the through hole. It is thought that this distortion occurred because the periphery of the through hole was pulled into the through hole and pulled.

Similarly, in the comparative example No. In No. 12, printing unevenness such as waving in the advancing direction of the web was observed in the portion sucked by the porous ceramic and the portion not. This is thought to have occurred because the portion adsorbed by the porous ceramic pulled the portion that was not.

(Example 2)
The radius of the adsorption roll and the thickness of the cylindrical porous ceramic sintered body were set as shown in Table 1 below to obtain a roll. All the materials of the cylindrical porous ceramic sintered body were alumina-20 mass% titanium carbide. In both cases, the porosity is 40%, and the average pore diameter is 2 μm.

  The roll end members and other dimensions are the same, and Table 1 shows the setting of the roll radius and the thickness of the cylindrical porous ceramic sintered body. Using these rolls, a gold foil having a thickness of 10 μm was adsorbed, conveyed and guided, and the adsorbed state was examined.

As shown in the results of Table 1, a roll No. having a ratio of the roll radius to the thickness of the cylindrical porous ceramic sintered body of 10 or more was used. 2, No. 3, no. 4, no. 6, no. For No. 7, good adsorption force was obtained.

  On the other hand, the roll No. whose ratio is less than 10. No. 5 has a thickness of the cylindrical porous ceramic sintered body, so that the adsorbing force was able to adsorb and convey and guide, but did not reach other rolls.

Also, the roll porous ceramic sintered body having a thickness of roll No. For No. 2, the adsorbed state was good, but since it was thin, cracks and chips were likely to occur during production, and it was necessary to process with reduced processing efficiency to eliminate it. In terms of manufacturing cost, a product of 1 mm or more could be manufactured at a low cost.

(Example 3)
An adsorbing roll made of silicon nitride having a porosity of 15% and an average pore diameter of open pores on the outer peripheral surface of the cylindrical porous ceramic sintered body of the present invention was manufactured. The test was performed by changing the surface roughness of the portion of the cylindrical porous ceramic sintered body that adsorbs the web as shown in Table 2 by changing the count of the grindstone during processing. A screen printing process was performed in the form shown in FIG. 9 while sucking and feeding a polyethylene-based web having a thickness of 10 μm with this suction roll. The rod-shaped application tool 10 is configured so that the quick-drying slurry 11 comes out uniformly from the tip in the web width direction.

  The dried web was cut into small pieces, and the surface condition was observed with an AFM (atomic force microscope).

As shown in the results in Table 2, it was found that the adsorbing roll having the center line average roughness Ra ≦ 1.5 μm and the maximum height Rz ≦ 15 μm can be satisfactorily applied with no unevenness. If the surface roughness is larger than this, it is considered that the unevenness on the surface of the cylindrical porous ceramic sintered body is also transferred to the web, thereby making a difference in the state of the web after coating.
The suction roll of the present invention that satisfies the conditions of claim 3 is particularly effective when it is desired to control the state of a very small surface. However, in the case of general precision coating or printing, the sample No. 28, no. There are many cases where there is no problem in use even at about 29.

Example 4
In Example 1, alumina containing 0.25% magnesia component was used as the cylindrical porous ceramic sintered body. However, any ceramic material shown in claim 5 (alumina, zirconia, silica, silicon carbide, yttria, magnesia) was used. , Titanium carbide, titanium nitride, tungsten carbide), the same adsorption roll could be obtained by controlling the state of the pores.

(Example 5)
An adsorption roll in which the thickness of the alumina-based cylindrical porous ceramic sintered body 1 was 1 mm and the reinforcing body 2 was integrally joined to the inner surface thereof was manufactured. The alumina-based cylindrical porous ceramic sintered body 1 has a porosity of 30% and an average pore diameter of 1.0 μm. This schematic diagram is shown in FIG.
A cylindrical dense alumina sintered body (density 99%) was used as the reinforcing body 2, and its outer shape was made 20 μm smaller than the inner diameter of the cylindrical porous ceramic sintered body 1. A portion corresponding to the outer periphery of this cylindrical reinforcing body is scraped off by grinding except for a part, and is formed into a pentagonal cylindrical shape with arcs remaining at each corner, and pressure reduction from the inner surface is applied to the cylindrical porous ceramic sintered body. A plurality of slits 13 were provided from the inner surface to the outer surface so that transmission was possible. An organic adhesive was applied to each of the five arcs 12 of the reinforcing body, adhered to the inner surface of the cylindrical porous ceramic sintered body 1, and dried.
By adhering the end made of hardened steel to the integrated one, an adsorbing roll having a reinforcing body was obtained.
Advantages of the adsorption roll having the reinforcing body are shown below.
1. Since it is reinforced by the reinforcing body, deformation such as deflection generated in the suction roll is small. Therefore, even when the adsorbing roll is long, the deflection can be minimized. Further, since there is reinforcement, the cylindrical porous ceramic sintered body can be made thin when a further adsorption force is required.
2. Since the thermal expansion coefficient of the reinforcing body and the cylindrical porous ceramic sintered body is small, deformation and destruction due to temperature change do not occur. In this example, the thermal expansion coefficient of the cylindrical porous ceramic sintered body is 7.5 × 10 ⁻⁶ (K ⁻¹ ), and that of the reinforcing body is approximately 7.4 × 10 ⁻⁶ (K ⁻¹ ). It was the same. Therefore, the hardened steel end portion of the adsorption roll is prevented from shrinking due to temperature change, and deformation caused by a difference in thermal expansion and cracking of the cylindrical porous ceramic sintered body can be relieved greatly. On the other hand, if the difference in thermal expansion is as large as 1.0 × 10 ⁻⁶ (K ⁻¹ ) or more, the separation between the reinforcing body and the cylindrical porous ceramic sintered body may cause separation or cylindrical porous In order to lead to cracking of the ceramic sintered body, the thermal expansion difference is more preferably 1.0 × 10 ⁻⁶ (K ⁻¹ ) or less.
3. Since the reinforcing body can also be a dense ceramic, it is easy to protect the cylindrical porous ceramic sintered body from stresses such as bending and twisting.

In this embodiment, the reinforcing material is cut into a pentagonal cylinder, but any shape may be used as long as it can be sufficiently bonded to the cylindrical porous ceramic sintered body.

(Example 6)
In the same manner as in Example 5, an adsorption roll in which the thickness of the alumina-based cylindrical porous ceramic sintered body 1 was 1 mm and the reinforcing body 2 was integrally joined to the inner surface thereof was manufactured. The alumina-based cylindrical porous ceramic sintered body 1 has a porosity of 30% and an average pore diameter of 1.0 μm.
The reinforcing body in this case is a cylindrical porous alumina sintered body 22, and a schematic diagram thereof is shown in FIG. The porosity of the reinforcing body was 50%, and the average pore diameter was 10 μm. The reinforcing body has a higher porosity and average pore diameter. By reducing the pressure from 3 inside the reinforcing body, the cylindrical porous ceramic sintered body 1 was able to adsorb the web well on the surface.
In this case, unlike the case where dense ceramics are used, part of the outer shape can be cut off and grooving can be omitted.

The schematic diagram which shows the cross section of the adsorption | suction roll of this invention Schematic diagram for adsorbing and conveying the web with an adsorption roll Schematic diagram of the suction roll of the present invention (without reinforcing body) Schematic diagram of the suction roll of the present invention (when vacuuming is performed from the end member, there is a reinforcing body) Schematic diagram of the suction roll of the present invention (when a vacuum is drawn from a ring-shaped slit at the end using a spacer, there is a reinforcement) Schematic diagram of the suction roll of the present invention (when vacuuming is performed from the end member) Cylindrical porous ceramic sintered body used for the adsorption roll of the present invention Schematic diagram of printing a web using a roll Schematic of applying slurry to web with application tool Schematic showing the cross section of the suction roll of the present invention (using porous ceramics for the reinforcement)

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cylindrical porous ceramic sintered body 2 Reinforcing body 3 Space inside roll 4 Part where cylindrical reinforcing body is shaved 5 Roll end 6 Vacuum drawing path 7 Roller 8 for changing web traveling direction Printing roll 9 Web 10 Application tool 11 Slurry to be applied 12 Adhesive part 13 Slit 14 serving as a vacuum evacuation path Ring-shaped slit (always communicated with 6)
15 Printed web portion 22 Reinforcing body (porous ceramic)
100 Whole adsorption roll A Place where a mechanism for processing web is installed

Claims (6)

An adsorbing roll that adsorbs and conveys a belt-shaped web on the roll surface by reducing the pressure inside the roll to below atmospheric pressure,
At least the portion in contact with the belt-shaped web is made of a cylindrical porous ceramic sintered body,
The cylindrical porous ceramic sintered body has an average pore diameter of 2 μm or less (excluding 0) and a porosity of 15 to 40% at least in contact with the web.
The porous ceramic sintered body is a ceramic based on one or more of alumina, zirconia, silicon carbide, magnesia, titanium carbide, titanium nitride, titanium carbide, tungsten carbide, silicon nitride, and aluminum nitride. ,
An end member that rotates together with the cylindrical porous ceramic sintered body at the end of the cylindrical porous ceramic sintered body,
An adsorbing roll having a passage for decompression inside the roll in the vicinity of the rotation center of the roll.   It further has a member penetrating in the length direction of the roll at the center of rotation of the roll,
  In the cylinder of the cylindrical porous ceramic sintered body, the inner peripheral part of the cylindrical porous ceramic sintered body and the outer peripheral part of the reinforcing body are integrally joined,
  The suction roll according to claim 1, wherein a material of the reinforcing body is a material based on the same kind of ceramic as the cylindrical porous ceramic sintered body.   The suction roll according to claim 1 or 2, wherein a thickness of the belt-like web is 25 µm or less. The suction roll according to any one of claims 1 to 3, wherein the roll internal pressure reducing passage is provided in a member penetrating in a length direction of the roll. The suction roll according to any one of claims 1 to 3, wherein the roll internal pressure reducing passage is provided at a center of rotation of the end member. Surface roughness of at least a portion in contact with the web of the tubular porous ceramic sintered body, one of claims 1 to 5 arithmetical mean roughness Ra of 1.5μm or less and a maximum height Rz is 15μm or less adsorption roll according to any.

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