JP2002338097A - Paster roll - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paster roll capable of firmly pressing first web and second web. SOLUTION: This paster roll 20 for pressing the first web and the second web in a superposed state is provided with a recessed part 25 for air expulsion on an outer peripheral surface. In the paster roll 20, both end parts of the outer peripheral surface are chamfered. The paster roll 20 is formed into a prescribed crown shape.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for joining a first web and a second web by pressing the first web and the second web in an overlapping state.

[0002]

2. Description of the Related Art In a production line for a magnetic recording medium or other belt-like material, a web made of plastic, paper, metal foil, or the like is drawn from a web roll and subjected to a predetermined treatment such as coating. Conventionally, various techniques have been proposed for exchanging a web roll (old roll) in which the web is pulled out and the winding amount is reduced and an unused web roll (new roll) without stopping the production line as much as possible. ing. For example, in Japanese Patent Application Laid-Open No. 11-91997,
There is disclosed a paper splicing apparatus in which the end of a web of an old roll and the front end of a web of a new roll are overlapped, and they are pressed by a brush and joined.

[0003] Japanese Patent Application Laid-Open No. 9-12185 discloses that
An apparatus is disclosed in which the end of the web of an old roll for magnetic recording media and the tip of the web of a new roll are overlapped, and they are pressed and joined by a paster roll (press roll; joining roll). In this apparatus, when the remaining web amount of the old roll becomes small, the new roll is rotated at the same speed as the old roll. Then, the web of the old roll is pressed against the outer peripheral surface of the new roll by the paster roll at a predetermined timing while detecting the position of the adhesive tape of the new roll by the detecting means provided near the new roll. As a result, the web end of the new roll is joined to the web end of the old roll via the adhesive tape of the new roll.

[0004]

In the conventional web joining apparatus, even when the web of the old roll is pressed against the outer peripheral surface of the new roll by the paster roll, the joining by the adhesive tape may be insufficient. If the bonding with the adhesive tape is insufficient, problems such as breakage of the web from the bonded portion occur with the web transport. Further, in the conventional web joining apparatus, when the web of the old roll is pressed against the outer peripheral surface of the new roll by the paster roll, the web of the old roll may be cut. Such web cutting causes a significant decrease in production efficiency due to the stoppage of the production line. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a paster roll capable of firmly pressing the first web and the second web, preventing web cutting, and improving productivity. To provide.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a paster roll for pressing a first web and a second web in a superposed state, wherein a concave portion for removing air is provided on an outer peripheral surface. This is achieved by a paster roll.

Recently, the thickness of a web such as a magnetic recording medium has been reduced. With such thinning of the web, air between the paster roll and the old roll web sometimes causes unstable behavior of the old roll web. Due to the influence of the air, the web of the old roll may not be uniformly pressed against the outer peripheral surface of the new roll. In particular, it has been found that when the web transport speed is high, the web of the old roll tends to be unable to be uniformly pressed against the outer peripheral surface of the new roll. If the above configuration of the present invention is adopted, since the concave portion for removing air is provided on the outer peripheral surface of the paster roll, the concave portion is formed when the paster roll is moved toward the web of the old roll by an air cylinder or the like. From the air between the paster roll and the first web. In this way, the first web can be uniformly pressed against the second web by the paster roll, so that the first web and the second web can be firmly pressed even if the web transport speed is high, Reliable web joining can be achieved.

The effect of the present invention is more remarkable for a thinner web, and the thickness of the first and second webs is 10 μm.
When the following conditions are satisfied, the effect of the present invention is particularly remarkable.
Also, the higher the web transport speed (for example, 200 m
/ Min or more), the effect of the present invention is remarkable. Further, in the present invention, it is preferable that a spiral groove is provided on the outer peripheral surface of the paster roll. Such a groove can be formed by a simple processing, and is easily cleaned while using the paster roll. The groove shape is preferably a semicircular shape or a circular arc shape in a cross-sectional view, but a rectangular shape or the like can also be employed and is not particularly limited. The groove pitch can be set, for example, to 1 to 10 mm. The groove depth can be set to, for example, 0.1 to 1 mm. Further, in the present invention, it is preferable that the paster roll has a configuration including a cored bar and a coating elastic body provided on an outer peripheral surface of the cored bar. As a material of the covering elastic body, for example, a resin such as rubber can be adopted.

[0008] The web supply device (web joining device) on which the above-mentioned paster roll is mounted can be configured as follows. That is, a first shaft on which an old roll is mounted, a second shaft disposed at a predetermined distance from the first shaft and on which a new roll is mounted, a web end of the old roll and a new shaft of the new roll. A paster roll that presses the web tip in a state of being overlapped with the web tip, wherein the paster roll is provided with a concave portion for removing air on the outer peripheral surface, and the web end of the old roll and the web tip of the new roll are A web supply device that joins by pressing a paster roll and supplies the web of the new roll successively to the web of the old roll.

Further, the above object of the present invention is to provide a paster roll which presses a first web and a second web in an overlapping state, wherein both ends of an outer peripheral surface are chamfered. Achieved by

[0010] Here, the chamfered portion is 2 mm from the end in the width direction of the web abutting on the outer peripheral surface of the paster roll.
It is preferable to include the outer peripheral surface of the paster roll facing the vicinity of both ends of 0 mm or more and 50 mm or less. further,
The chamfered portion may be a flat surface inclined at a predetermined inclination angle, or may be a curved surface. At this time, the inclination angle is preferably 3 ° or more and 20 ° or less, more preferably 5 ° or more and 15 ° or less, and particularly preferably 8 ° or more and 12 ° or less. In addition, the connection portion between the chamfered portion of the paster roll outer peripheral surface and the other portion may form an edge, or may be configured so as to eliminate the edge and connect smoothly. As the core metal, for example, a substantially cylindrical shape or a substantially cylindrical shape can be adopted. Examples of the material of the cored bar include aluminum and the like, but are not particularly limited thereto. As the material of the covering elastic body, a resin such as rubber can be adopted. The coated elastic body preferably has a hardness (HsA) of 40 to 70 measured by a spring hardness test (A type) specified in JIS K6301. The higher the web transport speed, the higher the HsA.

As a result of intensive studies by the present inventors, the above-described cutting of the web is performed when the paster roll is pressed against the outer peripheral surface of the new roll via the web of the old roll, and the paster roll is bent. It was found that both ends in the axial direction were strongly impacted against the web of the old roll and were caused. This is because, when the paster roll is pressed against the web of the old roll, a cylinder or the like installed near both ends of the paster roll is operated, so that the bending moment is maximized at the center of the paster roll.

According to the above configuration of the present invention, when the paster roll presses the web, both end portions in the axial direction of the paster roll that strongly touches the web are chamfered, and thus act on both end portions in the width direction of the web. The pressing force is reduced, and the web is pressed with a substantially uniform pressing force over the entire area in the width direction. Therefore, even if the paster roll is pressed against the web of the old roll, the axial ends of the paster roll do not strongly hit the web of the old roll, and the web can be reliably prevented from being cut. Thus, productivity can be improved.

The effect of the present invention is more remarkable with a thinner web, and the thickness of the first and second webs is 10 μm.
When it is less than m, especially less than 7 μm, the effect of preventing web cutting according to the present invention is particularly remarkable.

The web supply device equipped with the above-mentioned paster roll can have the following configuration. That is,
A first axis on which the old roll is mounted, a second axis disposed at a predetermined distance from the first axis and on which the new roll is mounted, a web end of the old roll, and a web tip of the new roll A paster roll that presses the paster roll in a state where the paster roll is overlapped with the paster roll, and both ends of the outer peripheral surface of the paster roll are chamfered. And a web supply device for supplying the web of the new roll subsequently to the web of the old roll.

Further, the above object of the present invention is attained by a paster roll which presses the first web and the second web in a state of being overlapped with each other, wherein the paster roll has a predetermined crown shape. You.

[0016] The crown shape means that the outer peripheral shape of the portion of the paster roll that presses the first and second webs is a predetermined crown (the outer peripheral diameter at the axial center portion of the pressed portion and the outer peripheral diameter at both axial end portions). Difference). That is, the outer peripheral surface diameter at the central portion in the axial direction of the pressed portion of the paster roll becomes maximum, and the outer peripheral surface diameter gradually decreases from the axial central portion toward both axial end portions. Is the minimum shape. The crown is preferably 0.5 mm or more and 2.5 mm or less per 1000 mm width of the paster roll. The pressing portion of the paster roll can be configured to have a cored bar and a covering elastic body provided on the outer peripheral surface of the cored bar, but is not particularly limited thereto. As the core metal, for example, a substantially cylindrical shape or a substantially cylindrical shape can be adopted. Examples of the material of the cored bar include aluminum and the like, but are not particularly limited thereto. As the material of the covering elastic body, a resin such as rubber can be adopted. The coated elastic body has an HsA of 40 to 70.
Are preferred. The higher the web transport speed, the higher the HsA.

According to the above configuration of the present invention, since the paster roll has a substantially crown shape, even when the paster roll is bent as described above, the central portion of the paster roll in the axial direction holds the web. When pressed, the paster roll can press the web of the old roll substantially uniformly over the entire area in the axial direction. Therefore, even if this paster roll is pressed against the web of the old roll, the axial ends of the pressed portion do not strongly hit the web of the old roll, and the web can be reliably prevented from being cut. Furthermore, the web can be satisfactorily joined even when the paster roll is pressed against the web with a weak force that cannot be conventionally joined with the web. That is, since the force for pressing the paster roll against the web is transmitted substantially uniformly throughout the axial direction, there is no need to apply an extra force for correcting the uneven pressing force due to the bending of the paster roll, and the web can be satisfactorily joined. .
Thus, productivity can be improved.

The effect of the present invention is more remarkable with a thinner web, and the thickness of the first and second webs is 10 μm.
The effect of preventing web cutting according to the present invention is particularly remarkable when the thickness is 7 μm or less.

The web supply device equipped with the above-mentioned paster roll can have the following configuration. That is,
A first axis on which the old roll is mounted, a second axis disposed at a predetermined distance from the first axis and on which the new roll is mounted, a web end of the old roll, and a web tip of the new roll And a paster roll that presses in a state where the paster rolls are overlapped, the paster roll has a crown shape, and the web end of the old roll and the web tip of the new roll are joined by pressing the paster roll, A web supply device for supplying the web of the new roll following the web of the old roll.

[0020]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic view of a web supply device 10 for a magnetic recording medium on which a paster roll 20 according to an embodiment of the present invention is mounted. As a web roll (new roll) for a magnetic recording medium, for example, one having dimensions of 500 mm in outermost circumference, 1000 mm in web width, 8000 m in length of wound web, and 10 μm or less in web thickness is used. No restrictions.

In this web supply device 10, an old roll 1a and a new roll 1b are mounted on the tip of a triaxial turret arm 11 rotatably supported. Note that the turret arm 11 is not limited to a three-axis one, and may be a two-axis one. An adhesive tape 2 such as a double-sided adhesive tape is provided on the outermost peripheral end of the web of the new roll 1b. A sensor 13 for detecting the position of the adhesive tape 2 is provided near the new roll 1b. In addition, new roll 1
A paster roll 20 is movably provided near b. Outer peripheral surface of new roll 1b and paster roll 20
The web of the old roll 1a is inserted between the outer peripheral surface and the outer peripheral surface. Outer peripheral surface of new roll 1b and paster roll 20
Are not in contact with the web of the old roll 1a.

When the remaining web amount of the old roll 1a decreases, the new roll 1b is rotated at the same speed as the old roll 1a. Then, while detecting the position of the adhesive tape 2 by the sensor 13, the
With 0, the web of the old roll 1a is pressed onto the adhesive tape 2 on the outer peripheral surface of the new roll 1b. Paster roll 20
Is driven by a cylinder actuator or the like. At this time, conventionally, the web of the old roll 1a is replaced with the new roll 1b.
Although there was a concern that it could not be uniformly pressed onto the adhesive tape 2 on the outer peripheral surface and a concern that the web might be cut, the web supply device 10 uses a paster roll 20 as described below. There is no such worry.

As shown in FIG.
Is a substantially cylindrical aluminum core 21 and rubber (HsA 40-70) provided on the outer peripheral surface of the core 21.
And 2. On the outer peripheral surface of the rubber 22, that is, on the outer peripheral surface of the paster roll 20, a spiral groove 25 as an air-removing concave portion is provided substantially in the entire axial direction. Journals 23 are provided at ends of the core metal 21 protruding from both ends of the rubber 22. Journal 23
Are rotatably supported by bearings 28.

As shown in the enlarged view of FIG. 2, here, the groove 25 has a substantially semicircular cross section. The groove pitch P is set to 1 to 10 mm. Groove depth D is 0.1-1mm
Is set to The groove 25 can be formed by a single groove process using a cutting tool such as a cutting tool. This groove 25 is easy to clean. For example, rubber 2
2, the axial dimension L is 1200 m, which is slightly larger than the web width.
m, but of course there is no limitation on the dimensions.
However, as described above, it is desirable that L is larger than the web width. This is because if the end of the roll hits the product surface of the old roll, that part may become NG.

When the above-mentioned paster roll 20 is moved toward the web of the old roll 1a shown in FIG. 1 by an air cylinder or the like, the air between the paster roll 20 and the web of the old roll 1a is released. 2
0 It is smoothly removed from the groove 25 on the outer peripheral surface. Therefore, the web of the old roll 1a can be uniformly pressed by the paster roll 20 onto the adhesive tape 2 on the outer peripheral surface of the new roll 1b. When the paster roll 20 comes into contact with the outer peripheral surface of the new roll 1b via the web of the old roll 1a, it is rotated together with the rotation of the new roll 1b. At this time, since the groove 25 has a spiral shape, the paster roll 2
The groove position (the position where the paster roll 20 does not press the web of the old roll 1a) at the contact point between the zero and the web of the old roll 1a moves with the rotation of the paster roll 20. Therefore, the web of the old roll 1a can be pressed almost uniformly by the paster roll 20 without any gap. According to this configuration, even if the web transport speed is high, the end of the old roll 1a and the tip of the new roll 1b can be reliably joined. With such a web supply device 10, productivity can be improved.

FIG. 3 is a schematic view showing a paster roll 30 according to another embodiment of the present invention. The paster roll 30 shown in FIG. 3A has spiral grooves 35a and 35b having different directions on one side and the other side with respect to the axial center of the outer peripheral surface of the rubber 32. Grooves 35a, 3
5b is so-called line symmetric. Such a symmetrical groove 3
According to the paster roll 30 provided with 5a and 35b, the first web and the second web can be pressed uniformly.

The paster roll 40 shown in FIG.
A plurality of ring-shaped grooves 45 are provided at equal intervals over substantially the entire axial direction of the outer peripheral surface of the rubber 42. According to the paster roll 40 provided with such a groove 45, the first web and the second web can be pressed uniformly.

The paster roll 50 shown in FIG.
A plurality of slits 55 as concave portions are provided at predetermined positions in the axial direction of the rubber 52 at intervals. Slit 5
At the location where 5 is provided, the core metal 51 may be exposed. According to the paster roll 50 provided with such a slit 55, the outer peripheral surface shape of the new roll can be adjusted, and the first web and the second web can be pressed uniformly.

The paster roll 60 shown in FIG.
The infinite number of dimples 65 are provided over substantially the entire area of the outer peripheral surface of the rubber 62 in the axial direction. According to the paster roll 60 provided with such dimples 65, the first web and the second web can be pressed uniformly. Further, the dimples 65 may be connected to each other.

FIG. 4 shows a paster roll according to still another embodiment of the present invention. As shown in FIG. 4, the paster roll 120 is made of a substantially cylindrical aluminum core 21.
And rubber (HsA 40 to 70) 122 which is a coating elastic body provided on the outer peripheral surface of the cored bar 21. Core 2
1 has a uniform outer peripheral surface diameter D3. Rubber 12 of metal core 21
A journal 23 is provided at an end protruding from both ends. The journal 23 is rotatably supported by a bearing 28. The outer peripheral surface of the rubber 122 includes a cylindrical surface portion 122a having an outer diameter D1 including a central portion in the axial direction, and a chamfered portion 122b which is adjacent to both axial end portions of the cylindrical surface portion 122a and is inclined at a predetermined inclination angle. I have. In addition,
In order to explain the position where the chamfered portion 122b is formed, a state where the web W is in contact with the outer peripheral surface of the cylindrical surface portion 122a of the rubber 122 is shown by a two-dot chain line. FIG. 4A shows one end in the width direction of the web W (the left side in FIG. 4) and the rubber 122 in contact with the vicinity of the end. Chamfer 122
b, when the web W comes into contact with the outer peripheral surface of the cylindrical surface portion 122a, the connecting portion C1 is separated from the end in the width direction of the web W by a distance d toward the inside of the web (rightward in the drawing). Chamfered at an angle θ. That is, the chamfered part 122
b is smaller than the outer peripheral surface of the cylindrical surface portion 122a by the core metal 2
It is inclined to one side.

For example, when the axial dimension L of the rubber 122 is 11
00 mm, the outer peripheral surface diameter D1 of the cylindrical surface portion 122a of the rubber 122 is 100 mm, and the outer peripheral surface diameter D3 of the core metal 21 is 80 m.
m, the distance d from the end of the web to the starting point of the chamfered portion 122b is 50 mm, and the inclination angle θ of the chamfered portion 122b is 10
°, but of course there is no limit on the dimensions.
However, as described above, it is desirable that L is larger than the web width. This is because if both end portions of the paster roll hit the product surface of the old roll, the portion may become NG. Further, it is preferable that the connecting portion C1 on the outer peripheral surface between the cylindrical surface portion 122a and the chamfered portion 122b does not form an edge.

According to the above-described paster roll 120, both ends in the axial direction of the paster roll 120 that strongly hit the web W when the web W is pressed are chamfered 122.
Because of b, the pressing force acting on both ends in the width direction of the web W is reduced, and the web W can be pressed with a substantially uniform pressing force over the entire area in the width direction. Therefore, even if this paster roll 120 is pressed against the web of the old roll,
Both ends in the axial direction do not strongly contact the web of the old roll, and the web can be reliably prevented from being cut. Thus,
Productivity can be improved.

FIG. 5 shows a paster roll according to still another embodiment of the present invention. The paster roll 130 is
A substantially cylindrical aluminum core 21 and rubber (HsA 40 to 7) which is a coating elastic body provided on the outer peripheral surface of the core 21.
0) 132. The rubber 132 has an outer diameter D
The cylindrical portion 132a and the chamfered portion 132b having a gentle curved surface adjacent to both ends in the axial direction of the cylindrical surface portion 132a. The connecting portion C2 between the cylindrical surface portion 132a and the chamfered portion 132b is smoothly connected. No edge is formed on the outer peripheral surface. Paster roll 1 as above
In No. 30, since no edge is formed on the outer peripheral surface of the rubber 132, when the paster roll 130 is mounted on the above-described web supply device 10 (see FIG. 1) and pressed against the web, pressure on the web is partially increased. There is no need to concentrate. Therefore, cutting of the web is more reliably prevented. The other configurations and operations that are not described are the same as those of the above-described embodiment.

FIG. 6 shows a paster roll according to still another embodiment of the present invention. As shown in FIG. 6, the paster roll 220 is made of a substantially cylindrical aluminum core 21.
And rubber (HsA40 to 70) 222 as a covering elastic body provided on the outer peripheral surface of the cored bar 21. The outer peripheral surface diameter D1 of the rubber 222 at the central portion in the axial direction is larger than the outer peripheral surface diameter D2 at both ends in the axial direction. More specifically, the rubber 222 has a crown shape in which the outer peripheral surface diameter D1 at the center in the axial direction is maximized. That is, the outer diameter of the rubber 222 gradually increases from both axial ends to the axial center. In the central portion in the axial direction, the outer peripheral surface is smoothly connected, and no edge is formed at the connection portion of the outer peripheral surface. The outer peripheral surface diameter D3 of the cored bar 21 is uniform. At the end protruding from both ends of the rubber 222 of the cored bar 21,
A journal 23 is provided. The journal 23 is rotatably supported by a bearing 28.

For example, when the axial dimension L of the rubber 222 is 11
00 mm, the outer peripheral surface diameter D1 at the axial center of the rubber 222 can be 100 mm, the outer peripheral diameter D2 at both axial ends of the rubber 222 can be 98.5 mm, and the outer peripheral diameter D3 of the cored bar 21 can be 80 mm. Of course, there is no limit on the dimensions. However, it is desirable that L is larger than the web width as described above, because if both ends of the paster roll hit the product surface of the old roll, that portion may become NG.

The paster roll 220 as described above is
Since the outer peripheral shape of the rubber 222 has a crown shape, the rubber 2
The central portion of the roller 22 presses the web in the axial direction, and the rubber 222 is substantially uniformly distributed over the entire area in the axial direction of the old roll 1a (FIG. 1).
Web) can be pressed. Therefore, even if the paster roll 20 is pressed against the web of the old roll 1a, both ends in the axial direction of the rubber 222 do not strongly contact the web of the old roll 1a, and the web cutting can be reliably prevented. Further, even when the paster roll 220 is pressed against the web with a weak force which cannot be conventionally used for joining the web, the web can be favorably joined. That is, since the force for pressing the paster roll 220 against the web is transmitted substantially uniformly throughout the axial direction of the rubber 222, it is not necessary to apply an extra force for correcting the uneven pressing force due to the bending of the paster roll 220. Good bonding can be achieved.
Thus, productivity can be improved.

It should be noted that the present invention is not limited to the above-described embodiment, and appropriate modifications and improvements can be made. The above embodiments may be combined. For example, by performing a chemical surface treatment on the outer peripheral surface of the paster roll,
The air removal effect may be promoted. For example,
The inner peripheral surface of the hollow cylindrical cored bar may be supported by a reinforcing member. Further, the rubber may be formed integrally with a member constituting the metal core 21.

[0038]

EXAMPLES (Test 1) FIG. 1 shows a web roll in which a web made of a PET film having a web width of 1000 mm and a web thickness of 6 μm is wound into a roll shape, and a prescale for ultra-low pressure is wound on the outer peripheral surface thereof. The new roll 1b was mounted on the web supply device 10 as shown. In addition, a similar web roll on which no prescale was wound was mounted as the old roll 1a, and the feeding tension was 100 N / m, and the speed was 200 m / m.
The web was supplied in min. Further, the rubber 12 of the paster roll 120 shown in FIG.
2, the width L in the width direction is 1100 mm, the hardness of the rubber 122 is HsA60, the diameter D3 of the outer peripheral surface of the cored bar 21 is 80 mm, and the distance d from the end of the web to the connection between the cylindrical surface and the chamfer is 50 mm. Two types of paster rolls with different inclination angles were prepared. Of these two types of paster rolls, the one with an inclination angle θ of 10 ° was Example 1, and the one with an inclination angle θ of 5 ° was Example 2. The above-mentioned web supply device is equipped with the paster roll of Example 1 or Example 2, and each paster roll is pressed against the new roll via the web supplied from the old roll, and is applied to the outer peripheral surface of the new roll. The pressing or cylinder pressure of the acting paster roll was measured, and the web of the old roll was observed and evaluated. At this time, for comparison, the same observation was performed using a conventional paster roll having a cylindrical outer peripheral surface having no chamfered portion, and evaluated.

In the test using the paster roll of Example 1, the cylinder pressure for operating the paster roll was set to 30.
At 0 kPa, the maximum value and the minimum value of the pressing force applied to the outer peripheral surface of the new roll were measured, and the web of the old roll was observed. Under the same conditions (cylinder pressure 300 kPa),
Observation was also made on the case where the conventional paster roll shown as Comparative Example 1 was used. Further, in the test using the paster roll of Example 2, as a condition under which the web was not cut, a cylinder pressure at which the maximum value of the pressing force applied to the outer peripheral surface of the new roll was 980 kPa and a minimum value of the pressing pressure were set. The measurement was performed, and the bonding state between the web of the old roll and the new roll was observed. Further, for the conventional paster roll shown as Comparative Example 2, the maximum value of the pressing pressure was 980 kPa, and the same observation was made.

Table 1 shows the results of the evaluation test described above.

[Table 1]

As shown in Table 1, according to the paster roll shown in Example 1, the maximum value of the pressing force acting on the outer peripheral surface of the new roll was 1180 kPa, and the minimum value was 880 kPa.
These differences were 300 kPa. Furthermore, the distribution of the pressing force of the paster roll acting on the outer peripheral surface of the new roll was minimum at the center in the width direction of the paster roll, increased toward both ends in the axial direction, and was maximum at both ends in the axial direction. . Also, no cutting of the web supplied from the old roll was observed. On the other hand, according to the paster roll shown in Comparative Example 1, the maximum value of the pressing force acting on the outer peripheral surface of the new roll is 2350 kPa, the minimum value is 880 kPa, and the difference between the maximum value and the minimum value is 1470 kPa, Cutting of the supplied web was observed. The distribution of the pressing force acting on the outer peripheral surface of the new roll was the same as in Example 1. From the above results, according to the paster roll of Example 1, the maximum value of the pressing force acting on the outer peripheral surface of the new roll is reduced to 1170 kPa as compared with 2350 kPa of the conventional paster roll. Therefore,
According to the first embodiment, the pressing pressure at the end in the width direction of the web is reduced, and the web is not cut. Furthermore, according to the first embodiment, the difference between the maximum value and the minimum value of the pressing pressure is 300 kP compared with the conventional paster roll of 1470 kPa.
a. Therefore, according to the first embodiment, the distribution of the pressing force acting in the web width direction becomes substantially uniform due to the reduction of the pressing force at the end in the width direction of the web, and the old roll can be cut without cutting the web. The web and the web of the new roll can be joined well.

As shown in Table 1, according to the paster roll of Example 2, the cylinder pressure was 200 kP.
a, the minimum value of the pressing force acting on the outer peripheral surface of the new roll is 680
kPa, and the web of the old roll and the web of the new roll were satisfactorily joined. The distribution of the pressing force acting on the outer peripheral surface of the new roll was the same as in Example 1. On the other hand, according to the paster roll shown in Comparative Example 2, the cylinder pressure was 10
At 0 kPa, the minimum value of the pressing pressure acting on the outer peripheral surface of the new roll was 490 kPa, and the new roll was not successfully joined to the web of the old roll. The distribution of the pressing force acting on the outer peripheral surface of the new roll was the same as in Example 1. From the above results, according to the paster roll of Example 2, the cylinder pressure can be doubled as compared with Comparative Example 2 without increasing the maximum value of the pressing pressure, and the minimum value of the pressing pressure can also be increased. . For this reason, since the difference between the maximum value and the minimum value of the pressing pressure acting on the outer peripheral surface of the new roll is reduced to 300 kPa as compared with 490 kPa of Comparative Example 2, the force pressing the paster roll 20 against the web is: It is transmitted substantially uniformly over the entire area of the rubber 122 in the axial direction. Therefore, even if the cylinder pressure is increased to correct the uneven pressing force due to the deflection of the paster roll, the maximum value of the pressing force is not increased,
The web of the old roll and the web of the new roll can be joined well.

(Test 2) FIG. 1 shows a web roll in which a web made of a PET film having a web width of 1000 mm and a web thickness of 6 μm is wound in a roll shape, and a prescale for ultra-low pressure is wound on the outer peripheral surface thereof. It was mounted on the web supply device 10 as a new roll 1b. In addition, a similar web roll on which a prescale was not wound was mounted as the old roll 1a, and a delivery tension of 98 N / m and a speed of 200 m / m were applied.
The web was supplied in min. Further, as the paster roll, the rubber 22 of the paster roll 220 shown in FIG.
2, two types of paster rolls having different crowns were prepared, with the width dimension L of 1100 mm, the hardness of the rubber 222 set to HsA60, the outer peripheral surface diameter D3 of the cored bar 21 set to 80 mm. Among these two types of paster rolls, a roll having a crown of 1.5 mm (maximum outer diameter D1: φ100 mm, minimum outer diameter D2: φ98.5 mm) is referred to as Example 3, and a crown of 0.5 mm (maximum outer diameter D1). : Φ
Example 4 was 100 mm and the minimum outer diameter D2 was 99.5 mm in diameter. In the above web supply device,
Wear the paster roll of Example 3 or Example 4,
Each paster roll is pressed against this new roll via the web supplied from the old roll, and the pressing pressure of the paster roll acting on the outer peripheral surface of the new roll is measured, and the web of the old roll is observed and evaluated. did. At this time, for comparison, the same observation was performed using a conventional paster roll having a cylindrical outer peripheral surface, and evaluation was performed.

In the test using the paster roll of Example 3, the cylinder pressure for activating the paster roll was 29.
At 4 kPa, the maximum and minimum values of the pressing force applied to the outer peripheral surface of the new roll were observed, and the web of the old roll was observed. The same conditions (cylinder pressure 294 kPa)
Thus, observation was also made on the case where the conventional paster roll shown as Comparative Example 3 was used. In the test using the paster roll of Example 4, the cylinder pressure was set to 196 kP.
As a, the maximum value and the minimum value of the pressing force applied to the outer peripheral surface of the new roll were observed, and the joining state between the web of the old roll and the new roll was observed. At the same cylinder pressure, the conventional paster roll shown as Comparative Example 4 was also observed.

Table 2 shows the results of the evaluation test described above.

[Table 2]

As shown in Table 2, according to the paster roll shown in Example 3, the maximum value of the pressing force acting on the outer peripheral surface of the new roll is 980 kPa, the minimum value is 880 kPa, and the difference between them is 100 kPa. Was. Further, the distribution of the pressing force of the paster roll acting on the outer peripheral surface of the new roll became minimum at the center in the width direction of the paster roll, increased toward both ends in the axial direction, and became maximum at both ends in the axial direction. Also, no cutting of the web supplied from the old roll was observed. On the other hand, according to the paster roll shown in Comparative Example 3, the maximum value of the pressing force acting on the outer peripheral surface of the new roll is 1470 kPa, the minimum value is 780 kPa, and the difference between the maximum value and the minimum value is 690 kPa, Cutting of the supplied web was observed. The distribution of the pressing force acting on the outer peripheral surface of the new roll was the same as in Example 3. From the above results, according to the paster roll of Example 3, the difference between the maximum value and the minimum value of the pressing force acting on the outer peripheral surface of the new roll is 690 k of the conventional paster roll.
It is reduced to 100 kPa compared to Pa. Therefore, according to the third embodiment, the pressing force acting in the web width direction becomes substantially uniform, and the web of the old roll and the web of the new roll can be satisfactorily joined without cutting the web.

As shown in Table 2, according to the paster roll of Example 4, the maximum value of the pressing force acting on the outer peripheral surface of the new roll is 880 kPa, and the minimum value is 680 kPa.
The difference was 200 kPa, and the web of the old roll and the web of the new roll were satisfactorily joined. The distribution of the pressing force acting on the outer peripheral surface of the new roll was the same as in Example 3. On the other hand, according to the paster roll shown in Comparative Example 3, the maximum value of the pressing force acting on the outer peripheral surface of the new roll is 980 kPa, the minimum value is 490 kPa, and the difference between the maximum value and the minimum value is 490 kPa, which is equal to that of the old roll. The new roll was not successfully joined to the web. The distribution of the pressing force acting on the outer peripheral surface of the new roll was the same as in Example 3. From the above results, according to the paster roll of Example 4, the difference between the maximum value and the minimum value of the pressing force acting on the outer peripheral surface of the new roll is reduced to 200 kPa as compared with 490 kPa of Comparative Example 4. Therefore, the force pressing the paster roll 20 against the web is transmitted substantially uniformly throughout the axial direction of the rubber 22. Therefore, there is no need to apply an extra force for correcting unevenness of the pressing force due to the bending of the paster roll 20, and the web of the old roll and the web of the new roll can be satisfactorily joined with a small pressing force.

[0048]

As described above, according to the present invention,
The first web and the second web can be pressed firmly,
It is possible to provide a paster roll that prevents web cutting and improves productivity.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram showing a web supply device to which an embodiment of the present invention is applied.

FIG. 2 is a partial sectional view showing one embodiment of the present invention.

FIG. 3 is a schematic diagram showing another embodiment of the present invention.

FIG. 4 is a schematic diagram showing another embodiment of the present invention.

FIG. 5 is a schematic diagram showing another embodiment of the present invention.

FIG. 6 is a schematic diagram showing another embodiment of the present invention.

[Explanation of symbols]

 1a Old roll 1b New roll 10 Web supply device 20 Paster roll 21 Core metal 22 Rubber (coated elastic body) 25 Groove (recess for air removal)

Continued on the front page. (72) Nobuo Yoshida, 2-12-1 Ogimachi, Odawara-shi, Kanagawa Prefecture Inside Fuji Photo Film Co., Ltd. (72) Tatsuo Katsumata 2-12-1 Ogimachi, Odawara-shi, Kanagawa Fuji Photo F-term in Film Co., Ltd. (reference) 3F064 AA04 BB05 BB11 BB21 BB31 DA00 FA01

Claims (1)

[Claims] 1. A paster roll for pressing a first web and a second web in a superposed state, wherein a recess for removing air is provided on an outer peripheral surface.