JP2014109293A - Rubber roll and its process of manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rubber roll and its process of manufacture in which it has improved more an effect for preventing occurrence of wrinkle shift and air film.SOLUTION: An outer peripheral surface of a roll main body 10 of a rubber roll 1 is formed with a plurality of grooves 11 arranged in an opposite helical manner to each other against a central part of its longitudinal direction under a prescribed interval L. Each of the grooves 11 is filled with rubber 13 having lower hardness than that of material of the roll main body 10. When the rubber roll 1 is rotated, its web is mainly gripped with a charged part filled with rubber 13, it is shifted from the central part of the roll toward its right and left sides, resulting in that occurrence of wrinkle is restricted. Further, since there are provided prescribed spaces between the right and left charging segments at the central part in a width direction of the roll, its central part shows a weak gripping force of the web, it is easily moved in friction toward a helical direction, so that the web is shifted toward its right and left sides to restrict occurrence of wrinkles.

Description

  The present invention relates to a rubber roll that supports and conveys a web such as a thin film or a soft film on the surface, and a method for manufacturing the same.

  In a line for winding a paper or plastic web (a thin film, a soft film, etc.) around a winding roll, a plurality of rubber rolls for conveyance are used. An example of the winding line is shown in FIG. As shown in FIG. 3, the web 20 is taken up by the take-up roll 50 while being pressed against the take-up roll 50 by the press-contact roll 40 through a plurality of rubber rolls 30 for conveyance. In such a line, in order to prevent wrinkling or shifting (slip) of the web 20 or the generation of an air film (air layer formed between the roll rotating at high speed and the web), as the rubber roll 30 for conveyance, FIG. In many cases, a roll having a spiral groove 31 formed on the surface is used (see Non-Patent Document 1). On the surface of the roll 30, a plurality of grooves 31 arranged in a spiral shape opposite to each other with respect to the center in the longitudinal direction are formed. When such a roll 30 rotates, air that has entered between the web and the groove conveyed in contact with the roll surface escapes along the groove. It is said that generation etc. are suppressed. Further, by forming the groove 31, it is possible to reduce the resistance due to the surface contact between the web and the roll surface, and to give the air film the function of releasing the air.

  However, such grooved rolls may cause problems such as transfer of groove marks to the wound web, or damage to the web at the corners of the grooves. Further, there is a problem that dust accumulated in the grooves adheres to the web.

On the other hand, a material in which the groove of the roll is filled with a material having a friction coefficient different from that of the material of the roll body has been proposed (see Patent Document 1). In this case, it is said that the transfer of groove marks and the like and the accumulation of dust in the grooves can be prevented, and the above-mentioned widening action of the web can be further enhanced.
However, even when the above roll is used, the effect of preventing wrinkle shift and air film formation is not sufficient.

JP-A-5-124761

"New roller material to prevent wrinkling of film" (Toshimichi Ishida, Material Stage Vol.10, No.10 2011)

  The present invention has been made in view of the above points, and it is an object of the present invention to provide a rubber roll and a method for producing the same, in which the effect of preventing wrinkle shift and air film generation is further improved.

  The rubber roll of the present invention is a rubber roll that supports and conveys a web such as a sheet or a film on the surface, and has a cylindrical rubber roll body, and is continuously arranged on the outer peripheral surface of the rubber roll body. A material having a hardness lower than the hardness of the rubber roll body is filled in spiral grooves opposite to each other in the longitudinal center of the main body so as to be flush with the surface of the rubber roll body. A predetermined interval is provided between the spiral grooves in the opposite direction at the center in the longitudinal direction of the surface.

  In general, the lower the rubber hardness, the higher the coefficient of friction. Therefore, the material filled in the spiral groove (referred to as the filling part) has a higher coefficient of friction than the part of the rubber roll body and has a higher grip with the web. Become. When the roll rotates, the filling portion apparently moves outward, and the web gripped by the portion is shifted in the left-right direction. As a result, the occurrence of wrinkles is suppressed. Further, since a predetermined gap is provided between the left and right filling portions in the central portion in the width direction of the roll, the grip force of the web is weak in the central portion, and it is easy to frictionally move in the spiral direction. It is considered that the generation of wrinkles is suppressed.

  In addition, air trapped between the surface of the roll and the web escapes through the surface portion of the roll main body, which has a relatively small gripping force on the web, so that the generation of an air film is also suppressed.

In this invention, it is preferable that the angle which the said reverse spiral part makes is 60 degrees-120 degrees.
When the angle is reduced, the angle of the surface of the roll body with respect to the circumferential direction of the roll (roll rotation direction) is reduced, so that the rotation of the roll allows air to escape more smoothly, and the surface of the roll body is vented. The effect is expected to increase. When the angle is increased, it is expected that the air bleeding action is reduced during the rotation of the roll, the influence on the web is weakened, and the action on the web is expected to be high. The angle is preferably about 90 °, but is determined according to the material of the web to be transported, the transport speed, etc. in consideration of the web transport characteristics according to the aforementioned angle.

In this invention, it is preferable that the difference of the hardness of the said rubber roll main body and the hardness of the material with which the said helical groove | channel is filled is 10 degrees-40 degrees.
If the difference in hardness is small, the difference in grip force is small, and a widening action is difficult to occur. On the other hand, if the difference is large, the difference in grip force becomes too large, which may affect the running of the web. Considering these matters, the difference in hardness is 10 ° to 40 °, preferably 15 ° to 25 °.

In the present invention, the interval between the reverse spiral grooves is preferably about 5 mm to 20 mm, more preferably about 5 mm to 15 mm, regardless of the size of the rubber roll body. More preferably, it is about 10 mm. The interval between the grooves may be about 5 mm to 12 mm, or about 8 mm to 15 mm.
If the interval is too wide, the effect of suppressing wrinkles due to the difference in grip force will not be exhibited. Conversely, if the interval is too narrow, the force will concentrate on the central inflection point and wrinkles will occur. Therefore, the interval is preferably about 5 mm to 20 mm, more preferably about 5 mm to 15 mm, and still more preferably about 5 mm to 10 mm.

  The method for producing a rubber roll according to the present invention is a method for producing a rubber roll that supports and conveys a web such as a sheet or a film on the surface thereof. A rubber roll main body is prepared, and the rubber roll main body is provided on the outer circumferential surface of the rubber roll main body. A plurality of spiral grooves opposite to each other in the longitudinal center are formed at predetermined intervals in the longitudinal center of the rubber roll body, and a material having a hardness lower than the hardness of the rubber roll body is formed in the groove. After that, it is characterized by performing post-treatment such as vulcanization and polishing.

  As is apparent from the above description, according to the present invention, the spiral portion having a different friction coefficient is formed on the roll surface in the direction opposite to the center in the longitudinal direction. It grips and pulls left and right, and the part with a low coefficient of friction acts as an air vent. Further, since a portion having a low friction coefficient is provided in the central portion in the longitudinal direction of the roll and the grip force of the web is lowered at the same portion, the central portion of the web is easily pulled to the left and right and is easily subjected to a widening action. Therefore, a rubber roll that can prevent wrinkles and air film can be provided.

It is a top view which shows the structure of the rubber roll which concerns on embodiment of this invention, FIG. 1 (A) is a figure which shows the whole, FIG.1 (B) is a figure which expands and shows the center part of a longitudinal direction. It is a flowchart which shows an example of the manufacturing process of the rubber roll which concerns on embodiment of this invention. It is a figure which shows an example of a web winding line typically. It is a top view which shows an example of the structure of the conventional rubber roll.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a plan view showing a structure of a rubber roll according to an embodiment of the present invention.
The rubber roll 1 has a roll body 10, a shaft 3 that supports the roll body 10, and a sleeve 5 that is interposed between the roll body 10 and the shaft 3.

  The roll body 10 is cylindrical and has a through hole in the center. The shaft 3 is inserted into the through hole via the sleeve 5. On the outer peripheral surface of the roll body 10, a plurality of grooves 11L and 11R are formed on the left and right sides with respect to the center in the longitudinal direction and arranged in spirals opposite to each other. The cross-sectional shape of the groove 11 is a square in this example. Hereinafter, with respect to the center of the roll body 10 in the longitudinal direction, the left groove in the drawing is referred to as a left spiral groove 11L, and the right groove is referred to as a right spiral groove 11R. Each of the left and right spiral grooves is parallel to the surface of the roll body 10, and the left and right spiral grooves 11L and 11R are arranged symmetrically with respect to the center in the longitudinal direction. As shown in FIG. 1B, the angle θ formed between each of the left spiral grooves 11L and each of the right spiral grooves 11R is 90 ° in this example. At the center of the roll body 10 in the longitudinal direction, a predetermined interval L is opened between the end of the left spiral groove 11L and the end of the right spiral groove 11R.

A dimension example will be described. When the length of the roll body 10 is 1000 mm (this is an example, and the length of the rubber roll of the present invention is not limited to this size), when the diameter is 100 mm, the width of each groove 11 W is 10 mm, the depth of each groove is 3 mm, and the pitch P between the grooves is about 20 mm. The distance L between the end of the left spiral groove 11L and the end of the right spiral groove 11R at the center in the longitudinal direction of the roll body 10 is 5 to 20 mm.
The roll body 10 is made of, for example, rubber having a rubber hardness of about 60 to 90 °, preferably rubber having a hardness of about 65 to 75 °, usually rubber having a rubber hardness of about 70 °, such as NBR rubber (nitrile Rubber), silicone rubber, EPDM rubber, urethane rubber and the like. In this specification, the rubber hardness means a value measured by a type A durometer (A type) of JIS K6253.

  Each groove 11 of the roll body 10 is filled with a rubber 13 made of a material whose rubber hardness is lower than that of the material of the roll body 10. The surface of the filled rubber 13 (also referred to as a filling portion) and the surface of the roll body 10 are the same surface, and the surface of the roll is a flat surface as a whole. The rubber hardness of the rubber to be filled is preferably about 15 to 40 ° lower than the rubber hardness of the roll body 10 (70 ° in this example), more preferably about 15 to 25 °, and usually about 20 °. Low. As such rubber, for example, NBR rubber, silicone rubber, EPDM rubber, urethane rubber and the like can be used.

The operation of this rubber roll 1 will be described.
The rubber 13 filled in the groove 11 of the rubber roll body 10 has a rubber hardness lower than that of the roll body 10. In general, the lower the rubber hardness is, the higher the friction coefficient is. Therefore, a difference occurs in the friction coefficient between the surface portion of the rubber roll body 10 and the filling portion 13 on the roll surface. That is, the filling portion 13 having a lower rubber hardness has a higher friction coefficient and a higher web grip. When the rubber roll 1 rotates in the direction of the arrow in FIG. 1 as the web is conveyed, the rubber 13 filled in the left and right spiral grooves 11 apparently moves outward from the center of the roll body 10. Therefore, the web conveyed on the surface of the roll main body 10 is mainly gripped by the filling portion 13 and is subjected to the effect of widening in the left-right direction from the center of the roll, thereby suppressing the occurrence of wrinkles. However, since the roll body 10 itself also has a certain gripping force, the web is stably gripped without causing a web shift or the like.

  In addition, since the gap L is opened between the left and right spiral grooves 11L and 11R in the center portion of the roll body 10 and the surface of the body 10 is exposed, the grip force of the web is relatively weak in the center portion. ing. That is, the web in the center is relatively free and is easily pulled in the left-right direction, and thus is easily subjected to a widening action.

  Further, in the case of the above-described spiral grooved roll (see FIG. 4), the groove acts as an air vent between the web and the roll surface, but in the transport roll 1 of the present invention, the air is the grip force of the web. Is relatively small, and escapes through the surface of the roll body 10, so that the generation of an air film is also suppressed.

  As described above, the generation of web wrinkles and an air film can be suppressed, and the web can be stably conveyed. Therefore, slip shift is eliminated, and deterioration due to frictional heat and generation of static electricity can be suppressed. If the rubber roll of the present invention is made of a conductive material (for example, white conductive rubber roll (manufactured by White Elecon / Maywa Rubber Industrial Co., Ltd., Softer Elecon: made by Meiwa Rubber Industrial Co., Ltd.) it can.

  The difference in rubber hardness between the roll body 10 and the filling portion 13 is 15 ° to 40 °, particularly 15 to 25 °, and most preferably about 20 °. If the difference is small, the difference in grip force is small and the widening action is difficult to occur. On the other hand, if the difference is large, the difference in grip force may be too large, which may affect the running of the web.

  Furthermore, since the entire surface of the roll is flat, it is difficult for dust and dust to adhere, transfer of groove marks to the web, and damage to the web at the corners of the grooves.

  The angle formed by the left filling portion 13L and the right filling portion 13R is 90 ° in this example, but can be changed in the range of 60 ° to 120 °.

  The distance L between the left and right grooves 11L, 11R is 5 to 10 mm in this example, but as described above, the distance L is preferably about 5 mm to 20 mm, and preferably about 5 mm to 15 mm. More preferably, it is more preferably about 5 mm to 10 mm. The interval between the grooves may be about 5 mm to 12 mm, or about 8 mm to 15 mm.

  When the grip force decreases during use, the grip force can be recovered by repolishing the entire surface of the roll.

This rubber roll can be used as a rubber roll for conveyance, and can also be used for, for example, a nip roll, a winding touch roll, a near roll, and the like.
The hardness of the roll main body and the filling portion, the shape and dimensions of the groove, and the like are determined as appropriate depending on the type of web (material, thickness, etc.) being conveyed, the conveying speed of the line, and the like.

Next, an example of a rubber roll manufacturing method will be described with reference to FIG.
First, at S1, a rubber roll body made of a material having a hardness of about 70 ° is prepared. As a material for the rubber roll body, NBR rubber, silicone rubber, EPDM rubber, urethane rubber, or the like can be used. Next, in S2, a plurality of grooves arranged in a spiral shape opposite to each other with respect to the longitudinal center of the rubber roll are formed on the surface of the rubber roll body. The angle formed by the left and right grooves, and the width and pitch of the grooves can be as described above.

  Next, rubber having a hardness of about 50 ° is filled in each groove to which the adhesive is applied in S4. As such rubber, NBR rubber, silicone rubber, EPDM rubber, urethane rubber and the like can be used. After vulcanization (S5), the surface is finally polished in S6 to flatten the roll surface.

The rubber roll of the present invention can be produced by the above-described method, but other production methods may be used. Examples of such other production methods include methods well known in the art.
Example The rubber roll shown in FIG. 1 was produced as follows.
First, in S1, a rubber roll body made of a material having a hardness of 70 ° was prepared (diameter 100 mm, length 1000 mm). As the rubber roll main body, the one manufactured by Meiwa Rubber Industrial Co., Ltd. and White Elecon 70 was used. Next, a plurality of grooves arranged in a spiral shape opposite to each other with respect to the longitudinal center of the rubber roll were formed on the surface of the rubber roll body. The angle formed by the left and right grooves was 90 °, and the distance between the grooves was 5 mm.
Next, an adhesive is applied to the grooves of the rubber roll obtained as described above, and each groove is filled with rubber having a hardness of 50 °. The rubber used is Softer Elecon 50, manufactured by Meiwa Rubber Industries. This was vulcanized using a vulcanizer, the surface was polished by a cylindrical polishing machine, the roll surface was flattened, and the rubber roll of the present invention was obtained. The obtained rubber roll was wound up as shown in FIG. A web (sheet made of polyethylene terephthalate having a thickness of 40 μm and a width of 800 mm) was taken up as a roll 40 of a line, and a test was performed to check whether wrinkles were generated. When the winding speed was 200 m / min, the web was wound up, and the resulting web was examined for wrinkles. As a result, no wrinkles were observed on the web.

DESCRIPTION OF SYMBOLS 1 Rubber roll 3 Axis 5 Sleeve 10 Rubber roll main body 11 Groove 13 Rubber (filling part)

Claims (5)

A rubber roll that supports and conveys a web such as a sheet or film on the surface,
It has a cylindrical rubber roll body,
A material having a hardness smaller than the hardness of the rubber roll body is formed in a spiral groove that is continuously arranged on the outer peripheral surface of the rubber roll body and is opposite to the longitudinal center of the rubber roll body. It is filled so that it is flush with the surface of
A rubber roll characterized in that a predetermined interval is provided between the spiral grooves in the opposite direction at the longitudinal center of the surface of the rubber roll.   The rubber roll according to claim 1, wherein an angle formed by the reverse spiral portion is 60 ° to 120 °.   The rubber roll according to claim 1 or 2, wherein a difference between a hardness of the rubber roll body and a hardness of a material filled in the spiral groove is 15 ° to 40 °.   The rubber roll according to any one of claims 1 to 3, wherein an interval between the reverse spiral grooves is 5 to 20 mm. A method of manufacturing a rubber roll that supports and conveys a web such as a sheet or film on its surface,
Prepare the rubber roll body,
On the outer peripheral surface of the rubber roll body, a plurality of spiral grooves that are opposite to each other in the longitudinal center of the rubber roll body are formed at predetermined intervals in the longitudinal center of the rubber roll body,
Fill the groove with a material having a hardness lower than that of the rubber roll body,
Thereafter, a post-treatment such as vulcanization and polishing is performed, and a method for producing a rubber roll is provided.

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