JP5422995B2 - PRESSING ROLLER AND WEB ROLL MANUFACTURING METHOD - Google Patents

Description

  The present invention relates to a contact pressure roller and a method for manufacturing a web roll body.

  FIG. 5 shows a schematic cross-sectional view of a slitter which is an example of a general plastic film roll manufacturing apparatus which is a typical example of a web roll body.

  As shown in FIG. 5, the plastic film roll manufacturing apparatus is composed of four parts. That is, the unwinding part 14 which unwinds the film web 10 from the raw fabric 18, the slitter part 16 that slits the film web 10, the guide roller part 15 that is arranged before and after the slitter part, and that transports the film web 10, and the slit film web 10 is a winding unit 17 that winds up 10.

  Among these, for example, between the unwinding portion 14 and the slitter portion 16, a nip roller 21 for tension separation is provided in order to prevent the tension of the unwinding portion 14 from affecting the slitter portion 16. The contact pressure roller used for the nip roller 21 is required to have a function of uniformly nipping the guide roller 26 in the width direction and gripping the film web 10. That is, if a uniform nip is not made, the tension distribution in the film web width direction becomes non-uniform at the time of slitting, and the edges of the slit film web 10 meander in the width direction (direction perpendicular to the paper surface in FIG. 5), This is because tearing may occur at the slit portion.

  In the winding unit 17, the contact roller 23 is brought into contact with the film roll body 6, and the film web 10 is wound up while suppressing entrainment air.

  The contact pressure roller used for the contact roller 23 is usually required to have the following four points.

  First, the contact roller is in close contact over the entire range in the film width direction and contacts with a uniform nip force. That is, if a uniform nip is not formed at any location in the axial direction of the contact pressure roller, the amount of air trapped between the web layers is uneven, leading to various winding defects.

  Second, the outer diameter of the contact pressure roller should be reduced as much as possible. This is because the amount of air trapped between the wound web layers increases as the outer diameter of the contact pressure roller increases. However, since the rigidity of the pressure roller itself decreases as the diameter decreases, pressing the journal part of the shaft in the direction of the take-up roll as in the past will cause the vicinity of the center of the pressure roller to bend in the direction opposite to the pressing direction. A new contradiction arises in that the surface pressure near the center decreases.

  Thirdly, the high speed performance of the contact roller is excellent, that is, the natural frequency (allowable speed) of the roller is high. This is necessary so that the contact pressure roller itself does not vibrate during rotation.

  Fourthly, it can be manufactured at the lowest possible cost. Usually, since the contact roller has a length corresponding to the width of the final product, it is necessary to prepare a roller having a length corresponding to all kinds of product widths requested by the customer. Furthermore, since a spare roller for rewinding or repairing rubber is naturally required, a very large number of rollers must be manufactured as compared with other rollers. For this reason, the contact roller must be able to be manufactured as low as possible.

  That is, the above-mentioned four points of the uniform nip, the reduction in diameter, the high speed performance, and the manufacturing cost are required for the contact pressure roller used for the contact roller.

As a conventional pressure contact roller for the purpose of improving such technical problems, the outer cylinder member and the central shaft are connected and fixed only at the axial center of the outer cylindrical member, and the outer cylindrical member and the central shaft are bent. In some cases, the bend of the outer cylinder member is made to follow the bend of the take-up roll or the guide roller so as to nip uniformly. (For example, see Patent Document 1)
As another conventional pressure contact roller, the outer cylinder member and the central axis are connected by a bearing provided at a constant interval in the axial direction inside the outer cylindrical member to separate the deflection of the outer cylindrical member and the central axis. In some cases, the entire outer cylindrical member is attempted to nip uniformly along the deflection of the winding roll or guide roller. (For example, see Patent Document 2)
As shown in FIG. 6, the two types of contact pressure rollers separate the respective deflections of the central shaft and the outer cylinder member, and bend the outer cylinder member in the same direction as the deflection of the cylindrical body such as a take-up roll or a guide roller. Therefore, it can be said that this is a similar technical idea in that it aims to obtain a uniform nip.
Japanese Utility Model Publication No. 2-29076 Japanese Examined Patent Publication No. 6-45410

  By the way, the core which winds up a film at the time of winding is called a core, and is made from various materials and sizes. Among them, the core used for winding plastic films is made of iron, aluminum, FRP (fiber reinforced resin), plastic, paper, and has an inner diameter of 3 inches (= 76.2 mm) or 6 inches (= 152.4 mm). Is often used. Of these, cores made of FRP, plastic, and paper are often used as cores for final products because they are lightweight and easy to handle, but these have an overwhelmingly lower longitudinal elastic modulus than those made of metal such as iron or aluminum. . For this reason, especially when a film is wound or a 3 inch (= 76.2 mm) core is used, the core is greatly deflected when the contact pressure roll is nipped, and the conventional contact pressure roller can fully follow the deflection. Therefore, there is a problem that the uniform nip property is deteriorated and winding defects such as start wrinkles are generated.

  The present invention has been conceived in view of such problems. That is, it is an object of the present invention to provide a contact pressure roller that can ensure uniform nip even when a core made of a low elastic material such as plastic or paper is used.

In order to achieve the above object, according to the present invention, a hollow cylindrical outer cylinder member and a central axis disposed inside and coaxially with the outer cylinder member are provided, and an axially central portion of the outer cylinder member is provided. The outer cylinder member and the central shaft are connected to each other, and the longitudinal elastic modulus of the outer cylindrical member is 60 GPa or more and 100 GPa or less, and the longitudinal elastic modulus of the central shaft is 190 GPa or more and 470 GPa or less. A contact pressure roller is provided.

  Moreover, according to the preferable form of this invention, the said outer cylinder member consists of aluminum alloys, and the said contact axis roller which consists of steel is provided.

  Moreover, according to the preferable form of this invention, the contact pressure roller which at least one of the said outer cylinder member and the said center axis | shaft consists of carbon fiber reinforced resin is provided.

  Moreover, according to another form of this invention, the manufacturing method of the web roll body which uses the said contact pressure roller for at least one use of a contact roller and a nip roller is provided.

  According to the present invention, as described below, it is possible to obtain a contact roller that can ensure uniform nip even when a core made of a low elastic material such as plastic or paper is used.

  That is, in the contact pressure roller provided with a hollow cylindrical outer cylinder member and a central axis that is coaxially disposed on the inner side thereof, and the outer cylinder member and the central axis are connected to each other in the axial central portion of the outer cylinder member. Since the longitudinal elastic modulus of the outer cylinder member is 60 GPa or more and 100 GPa or less, it can sufficiently follow the bending of the core made of the low elastic material. Moreover, since the longitudinal elastic modulus of the central axis is 190 GPa or more and 470 GPa or less, the deflection of the central axis is reduced, and a decrease in surface pressure at the central portion can be suppressed.

  Further, a high-performance contact pressure roller can be obtained at low cost by manufacturing the outer cylinder member with an aluminum alloy and the center shaft with steel.

  Further, by using at least one of the outer cylinder member and the central shaft as a carbon fiber reinforced resin, a contact roller having higher performance, that is, uniform nip property, small diameter, and high speed performance can be obtained.

  A case where an embodiment of the present invention is applied to a synthetic resin film roll manufacturing apparatus will be described as an example with reference to the drawings.

  FIG. 1 is a schematic cross-sectional view of a contact pressure roller according to this embodiment. FIG. 2 is a schematic longitudinal sectional view showing an example of a film roll manufacturing apparatus using the contact pressure roller of the present embodiment, and FIG. 3 is a sectional view taken along the line AA in FIG. FIG. 4 is a schematic longitudinal sectional view of another embodiment of the contact roller according to the present invention. FIG. 6 is a schematic cross-sectional view showing an example of a bending state of a contact pressure roller having a bending separation structure.

  As shown in FIG. 1, the contact roller 1 is inside a hollow cylindrical outer cylinder member 2 and inside the outer cylinder member 2, and is connected and fixed to the outer cylinder member 2 at the axial center of the outer cylinder member 2. And a central axis 4. The central shaft 4 has a tapered shape that gradually decreases toward the end in the axial direction so as to have the largest diameter at the joint portion (joint width L) with the outer cylinder member 2. In many cases, the surface of the outer cylindrical member 2 is covered with rubber or a rubber-like elastic body 3.

  Further, as shown in FIG. 4, a hollow cylindrical outer cylinder member 2 and a central shaft 4 connected by a bearing 7 provided inside the outer cylinder member 2 at a predetermined interval in the axial direction are provided. Although the same effect as the contact pressure roller shown in FIG. 1 can be obtained by the contact pressure roller having the structure, the contact pressure roller shown in FIG. 1 will be described below.

  In this embodiment, the longitudinal elastic modulus of the outer cylinder member 2 is 60 GPa or more and 100 GPa or less, and the longitudinal elastic modulus of the central shaft 4 is 190 GPa or more and 470 GPa or less.

  As shown in FIG. 6, in this embodiment, bearings 5 are fitted to both ends of the central shaft 4 and are pressed toward the film roll body 6 by a pressing means 9 such as a fluid cylinder. Naturally, the central shaft 4 bends in the opposite direction to the film roll body 6, and the film roll body 6 bends in the opposite direction to the contact roller 1 by the pressing force from the contact roller 1. Since the outer cylinder member 2 is supported by a joint portion with the central shaft 4 and is bent by a reaction force from the film roll body 6, it is bent in the same direction as the film roll body 6. As described above, in the present embodiment, the outer cylinder member 2 is bent in the same direction as the film roll body 6 to obtain a uniform nip. Therefore, the bending amount of the outer cylinder member 2 is equal to or more than the bending amount of the core. Is necessary for a uniform nip. In particular, at the beginning of winding of the film, there is no rigidity reinforcing effect due to the film wound around the outer periphery, and only the core 9 has rigidity, so that the deflection becomes large. For this reason, wrinkles due to non-uniform nips called start wrinkles are likely to occur at the beginning of film winding. The material of the core includes paper, various resins and GFRP when the modulus of elasticity is small, and metal such as aluminum and steel when the modulus of elasticity is large, and the inner diameter is 3 inches (= 76.2 mm) or 6 inches (= 152. 4 mm) is common. It was found from analysis and experiment that the longitudinal elastic modulus of the outer cylindrical member 2 should be 100 GPa or less in order to follow the various core bendings without difficulty and to ensure uniform nip property. However, if the longitudinal elastic modulus is too small, chatter vibrations are generated in the cutting process at the time of manufacture, and the machining accuracy is remarkably deteriorated. Therefore, the machining speed has to be reduced and the production cost is greatly increased. Need more.

  Since the outer cylinder member 2 is connected to the central shaft 4 at the axially central portion, the outer cylindrical member 2 has a function of reducing the deflection of the central shaft 4. Therefore, if the longitudinal elastic modulus of the outer cylinder member 2 is within the range of the present embodiment, the rigidity of the central portion in the axial direction is insufficient, so that the deflection of the central shaft 4 increases. Therefore, the outer cylinder member 2 connected to the central shaft 4 also bends greatly in the direction opposite to the direction in which the core 9 bends, and the uniform nip property deteriorates. Further, the longitudinal elastic coefficient of the central shaft 4 has a greater influence on the natural frequency of the contact pressure roller than the outer cylinder member 4, and if the longitudinal elastic coefficient is low, there is a risk of resonance within the operating speed range. For the above reasons, the longitudinal elastic modulus of the central shaft 4 needs to be 190 GPa or more. As the longitudinal elastic modulus of the central shaft 4 increases, the uniform nip property improves and the natural frequency increases. However, materials having a longitudinal elastic modulus exceeding 470 GPa, such as carbon fiber reinforced resin using ultra-high elastic yarn, are very expensive. Therefore, it can be said that the material of the contact roller is not realistic.

  The material of the central shaft 4 and the outer cylinder member 2 is appropriately determined within the above-described range of the longitudinal elastic modulus, and an aluminum alloy is used for the outer cylinder member 2 and a steel material such as carbon steel or stainless steel is used for the central shaft 4. And cost performance is very high and preferable. In particular, since it is necessary to manufacture a plurality of slitter contact rolls for one film production machine, the cost is greatly reduced.

  Further, it is preferable to use a carbon fiber reinforced resin for at least one of the outer cylinder member 2 and the central shaft 4 because the natural frequency can be increased and the diameter can be reduced, and the roller weight is reduced and handling is improved. . In addition, since the desired longitudinal elastic modulus can be obtained by appropriately designing the longitudinal elastic modulus and the laminated structure of the carbon fiber, a contact roller having an optimal longitudinal elastic modulus according to the winding condition of the film roll. This is preferable because it can be manufactured. Further, in the case of a contact pressure roller in which the length of the outer cylinder member 2 exceeds 1 m, the outer cylinder member 2 is a carbon fiber reinforced resin using a low elastic thread, rather than being manufactured by processing an aluminum alloy pipe. Since it is often cheaper to use, it is preferable.

  The outer cylinder member 2 and the central shaft 4 may be connected and supported by a taper shape or a stepped shape in which the central shaft 4 has a thick connecting portion at the center in the axial direction, and may be fitted or bonded. May be made straight, and a cylindrical support member may be fitted between the outer cylinder member 2 and the central shaft 4 and bonded. In the case of bonding, the adhesive is preferably located between the outer cylinder member 2 and the central shaft 4 and can serve as a buffer that can be elastically deformed.

  The connection support length L between the outer cylinder member 2 and the central shaft 4 is preferably 5 to 50% of the length of the outer cylinder member 2. The shorter the connection support length L, the easier it is to separate the deflection of the outer cylinder member 2 and the central shaft 4, so that the uniform nip property is improved. However, if the connection support length L is less than 5%, the life of the connection support portion is insufficient due to insufficient strength. Or the natural frequency is lowered. On the other hand, if the connection support length L exceeds 50%, the deflection of the outer cylinder member 2 and the central shaft 4 cannot be separated and the uniform nip property is lowered, which is not preferable.

  The outer diameter of the contact pressure roller is preferably as small as possible because the amount of air entrained between two rotating cylinders in contact with each other increases as the outer diameter increases, and the roller (web width) is preferably as small as possible. The longer the length, the less air escape from the end of the product roll after winding, and the smaller the amount of air entrained during winding, the smaller the diameter.

  The type of rubber 5 coated on the outer periphery of the outer cylindrical member 2 is not particularly limited. For example, natural rubber, nitrile rubber, chloroprene rubber, ethylene propylene rubber, silicone rubber, chlorosulfonated polyethylene, urethane rubber, fluororubber, and These mixtures can be appropriately used depending on the purpose of use and usage environment.

  The rubber 5 preferably has a rubber hardness of 30 to 85 Hs JIS A (JIS K 6301: 1995 revision). If the hardness is less than 30 Hs, it is soft, so that the wear is severe, and if it exceeds 85 Hs, the uniform nip property and vibration absorption are deteriorated.

  The thickness of the rubber to be coated can be arbitrarily selected, but is preferably in the range of 1 to 5 mm from the viewpoints of reducing the diameter of the contact pressure roller, uniform nip, and vibration absorption. That is, if the rubber thickness is less than 1 mm, the apparent hardness of the rubber is increased, so that the uniform nip and vibration absorption are reduced. If the rubber thickness is 5 mm or more, the diameter of the contact roller must be increased. Because.

  In the preferable form of the manufacturing method of the web roll body of this embodiment, a web is wound up, making the above-mentioned contact pressure roller into contact with a winding roll. Further, even when the contact roller of this embodiment is used for other applications that require a uniform nip, such as a nip roller for tension separation in web conveyance and a nip roller for scraping the coating liquid in the coating process, excellent effects can be obtained. Below, an example of the form which winds up a film web using it for a winding part from the inside is demonstrated.

  2 and 3, the core 9 is gripped by a chuck 13 supported by a bearing 12 and is rotationally driven by a driving source (not shown) to wind up a film web 10 on a surface to form a film roll body 6. The contact pressure roller 1 is in contact with the film roll body 6 so that the film web 10 forms a uniform winding layer.

  The contact roller 1 is a contact roller according to the present embodiment and is pressed toward the take-up roller 9 by a pressing means 8 made of a fluid cylinder provided on bearings 7 at both ends of the central shaft 4. The outer cylinder member 2 and the film roll body 6 bend in a concave shape. At this time, if the amount of deflection of the outer cylinder member 2 is equal to or greater than the amount of deflection of the film roll body 6, it can be said that the uniform nip property is high. In other words, if the surface pressure at the axial center is equal to or greater than the surface pressure at the end, air entrainment at the center will not be excessive. Can be prevented.

  Examples of the conditions for winding the film web 10 include contact pressure, winding tension, and winding speed, and are appropriately determined according to the material, thickness, width, surface roughness, and the like of the film web 10 to be wound.

  The contact pressure is the magnitude of the force with which the contact roller 1 is brought into contact with the film roll body 6, and the larger the amount, the less the amount of air that is entrained between the film layers, so that the winding defect is less likely to occur. However, when the contact pressure is increased, the deflection of the core 9 is also increased, so that the uniform nip property is deteriorated or the film web 10 is charged. Therefore, it is preferable to adjust according to the rigidity and diameter of the core 9. Further, as the film roll body 6 becomes thicker, the amount of air taken in increases, and the bending rigidity of the film roll body 6 is reinforced by the film web 10, so that the film roll body 6 gradually increases according to the winding diameter of the film roll body 6. When the contact pressure is increased, a good winding shape is often obtained.

  Although the kind in particular of the film web 10 used as winding object is not restrict | limited, It can use suitably for plastic films, such as a polyethylene terephthalate film and a polypropylene film. Although the thickness is not particularly limited, it can be suitably used for a web in which wrinkles due to air entrapment between web layers such as a plastic film of 40 μm or less, particularly a plastic film of 10 μm or less are likely to occur. Further, the width of the web is not particularly limited, but the effect of the present embodiment is remarkable in a web having a width of 700 mm or more.

  In general, the wider the web to be wound, the easier the core 9 bends, so it is difficult to obtain a uniform winding nip and a good winding shape. However, according to this embodiment, a wide web exceeding 3 m is used. Even in winding, it is possible to nip uniformly, and a good winding shape can be obtained.

  In the present embodiment, it is preferable to use the above-described contact pressure roller to wind up under the condition that the minimum value / maximum value of the contact pressure within the contact pressure range is 0.5 or more. In a thin film web of 10 μm or less It is more preferable to wind up under the condition that the minimum value / maximum value is 0.7 or more. The contact pressure can be obtained by analysis in addition to measurement using a pressure-sensitive film or a strain gauge. Moreover, the uniformity of contact pressure can also be obtained by measuring the hardness unevenness of the rolled up product roll.

Hereinafter, the present invention will be specifically described by way of examples.
[Example 1]
In the apparatus shown in FIG. 2, a polyethylene terephthalate film having a thickness of 9 μm and a width of 1400 mm was wound using the contact pressure roller of the present invention shown in FIG. 1 as a contact roller. The outer diameter of the outer cylinder member was 82 mm, and a rubber was coated thereon with a thickness of 4 mm to obtain a contact pressure roller having an outer diameter of 90 mm. The material of the outer cylinder member was A6063 aluminum alloy (longitudinal elastic modulus = 69 GPa), and the material of the central shaft was S45C carbon steel (longitudinal elastic modulus = 202 GPa). The rubber used was chloroprene rubber, and the rubber hardness was 50Hs JIS A (JIS K6301: 1995 revision).

  The core used was a paper tube having an inner diameter of 76.2 mm and a thickness of 10 mm.

The winding conditions were a contact roll having a surface pressure of 400 N / m, a winding speed of 180 m / min, and a winding tension of 110 N / m.
[Example 2]
The conditions were the same as in Example 1 except that the material of the outer cylinder member was carbon fiber reinforced epoxy resin (longitudinal elastic modulus = 70 GPa).
[Example 3]
The same conditions as in Example 1 were used except that the material of the outer cylinder member was carbon fiber reinforced epoxy resin (longitudinal elastic modulus = 97 GPa).
[Example 4]
The same conditions as in Example 1 were used except that the material of the central axis was carbon fiber reinforced epoxy resin (longitudinal elastic modulus = 420 GPa). [Comparative Example 1]
The same conditions as in Example 1 were used except that the material of the outer cylinder member was STKM13A carbon steel pipe (longitudinal elastic modulus = 203 GPa).
[Comparative Example 2]
The same conditions as in Example 1 were used except that the material of the outer cylinder member was carbon fiber reinforced epoxy resin (longitudinal elastic modulus = 110 GPa).
[Comparative Example 3]
The conditions were the same as in Example 1 except that the material of the outer cylinder member was carbon fiber reinforced epoxy resin (longitudinal elastic modulus = 70 GPa) and the material of the central shaft was carbon fiber reinforced epoxy resin (longitudinal elastic modulus = 180 GPa).

The results of the examples and comparative examples are shown in Table 1. Example 4 is a reference example.

  As shown in the table, in Examples 1 to 4 according to the present invention, although a paper tube having low rigidity was used for the core, no uniform wrinkle was generated due to high uniform nip property. Moreover, compared with the comparative example 3, in Examples 1 and 2, the manufacturing cost could be reduced by 40% or more.

  The present invention can be applied not only to a method for producing a web roll body but also to a calendar device, a laminating device, and the like, but the application range is not limited thereto.

It is a schematic sectional drawing of this invention pressure roller. It is a schematic sectional drawing which shows an example of the manufacturing apparatus of the film roll body using the contact pressure roller of this invention. It is AA arrow sectional drawing of FIG. It is a schematic sectional drawing which shows the one aspect | mode of the contact pressure roller of this invention. It is the schematic which shows an example of the manufacturing apparatus of a general film roll body. It is a schematic sectional drawing which shows an example of the bending state of the contact pressure roller of a bending isolation | separation structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Contacting roller 2 Outer cylinder member 3 Rubber (rubber-like elastic body)
4 Center shaft 5 Bearing 6 Film roll body 7 Bearing 8 Pressing means 9 Core 10 Film web 12 Bearing 13 Chuck 14 Unwinding portion 15 Guide roller portion 16 Slitting portion 17 Winding portion 18 Original fabric 19 Guide roller 20 Lower blade roller 21 Nip roller 22 Upper Blade 23 Contact Roller 24 Wrinkle Roller 25 Dancer Roller 26 Guide Roller L Bonding Width

Claims (4)

A hollow cylindrical outer cylinder member and a central axis disposed inside the outer cylinder member and coaxially with the outer cylinder member, wherein the outer cylinder member and the a central axis contact pressure rollers which are connected the longitudinal elastic coefficient of the outer cylinder member is not less than 60 GPa 100 GPa or less, and Ri der modulus of longitudinal elasticity is 190GPa or more 470GPa following the central axis, said central axis Is a contact roller made of steel . Contact pressure roller according to claim 1, wherein the outer cylinder member is ing an aluminum alloy. The pressure roller according to claim 1, wherein the outer cylinder member is made of carbon fiber reinforced resin. A method for producing a web roll body, wherein the contact roller according to claim 1 is used for at least one of a contact roller and a nip roller.

Images