JP2000177890A - Contact rool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheet roll body in an excellent wound form hardly bending by providing spiral grooves continuously in symmetry from the axial center part of a roll to both ends, and setting groove width measured in the circumferential direction of the roll, to the specific value or less. SOLUTION: A spiral groove is continuously provided without a break, which serves to move air biting into a sheet roll, toward the end so as to be exhausted to the outside of the sheet roll body. Furthermore, spiral grooves are provided in lateral symmetry with the axial center part of a contact roll as a reference. Biting air can therefore be exhausted in shortest distance to the outside of the sheet roll body. The groove width (e) of the spiral groove measured in the circumferential direction of the roll is to be 30 mm or less. With the groove width thus set to 30 mm or less, the end of a sheet is restrained from falling into the spiral groove so as to obtain the sheet roll body in an excellent form without bending or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a contact roll capable of obtaining a sheet roll having a good roll form when winding a sheet such as a plastic film, paper, cloth, or foil.

[0002]

2. Description of the Related Art In general, the production of a film roll body is carried out by using a contact roll to adjust the amount of air that enters between the film layers from the winding port of the film. If the air entrapment amount is too small, a blocking phenomenon in which the films are bonded to each other is induced, and if the air entrapment amount is too large, wrinkles are generated to cause poor winding of the film roll body.

[0003] Japanese Patent Application Laid-Open No. 4-350050 discloses that a groove is provided in a contact roll to appropriately control the amount of air entrapment to solve the above-mentioned problems. However, for example, as shown in FIG. 1, when the lead angle θ of the groove 3 provided in the contact roll is small, the groove width e measured in the roll circumferential direction becomes large, and the end of the film 6 becomes 3, since the film is wound up in a state where the film is broken, there is a problem that the roll appearance of the film roll body deteriorates.

Japanese Utility Model Laid-Open Publication No. 59-37247 discloses that the lead angle θ of a spiral groove provided on the surface of a contact roll is optimized to maximize the amount of air discharged. In some cases, the groove width e measured in the circumferential direction of the roll may become large, and the problem that the end portion of the film is broken as described above has occurred.

Further, in Japanese Patent Application Laid-Open No. 8-175726, a spiral groove is provided intermittently in a contact roll.
It is disclosed that the lead angle θ of the groove is increased toward the end. However, although this has the effect of extending the wrinkles generated in the sheet, the efficiency of removing air is poor due to the intermittent grooves, and it is insufficient for use as a contact roll.

[0006]

DISCLOSURE OF THE INVENTION An object of the present invention is to provide a method for manufacturing a sheet roll body in view of the above-described problems.
An object of the present invention is to obtain a sheet roll body having a good rolled shape while reducing the falling of a sheet into a groove of a contact roll and injecting appropriate air.

[0007]

According to the present invention, there is provided a contact roll having a helical groove on a surface thereof, wherein the helical groove is symmetrical from the center in the roll axis direction to both ends. It is characterized by a contact roll which is provided continuously and has a groove width e of 30 mm or less measured in the roll circumferential direction.

Here, the groove width b of the spiral groove measured in the roll axis direction and the groove pitch p are expressed by the following equation: 0.1 ≦ (b / p)
It is also preferable that satisfies ≦ 0.8, and it is also preferable that the absolute value of the lead angle θ (rad) of the spiral groove be in the range of 0.17 to 0.7.

It is also preferred that the roll surface is formed of an elastomer.

Furthermore, the inclination angle α (rad) of the spiral groove
It is also preferable that the relationship between the absolute value of d and the groove depth d (mm) and the hardness H (゜) of the elastomer be within the range of the following expression.

0.5 ≦ | α | ≦ 1.5 1 ≦ d ≦ 20 20 ≦ H ≦ 60 Further, the edge of the spiral groove is preferably curved and / or chamfered. It is also preferable that the friction coefficient is 0.6 or less.

Further, a method of manufacturing a sheet roll body using the above-mentioned contact roll is also preferable.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In a contact roll 1 according to one embodiment of the present invention, as shown in FIG. 2, spiral grooves 3 are provided symmetrically and continuously from the center to both ends in the roll axis direction. The portion sandwiched between the spiral grooves 3 forms the ridge 2. A sheet such as a film travels in the direction of arrow A while being in contact with the contact roll.

The helical groove is provided continuously without interruption on the way, so that the air that has caught in the sheet roll is moved toward the end and discharged to the outside of the sheet roll. . Further, by providing the helical groove symmetrically with respect to the axial center of the contact roll, the trapped air can be discharged to the outside of the sheet roll at the shortest distance. It is preferable that a spiral groove is not provided in the central portion to such an extent that the winding appearance of the sheet roll does not deteriorate, so that the rotational runout of the contact roll can be easily measured.

In the present invention, the width e of the spiral groove measured in the roll circumferential direction is set to 30 mm or less. 3
When the thickness is 0 mm or less, the end of the sheet is less likely to fall into the spiral groove, and the sheet roll body can be obtained in a good roll without breaking. If the groove width e is 30 mm or less, the groove width e may be appropriately adjusted according to the thickness and elastic modulus of the sheet to be wound. The smaller the thickness is, the smaller the groove width e is.

If the groove width e is 30 mm or less, two or more spiral grooves can be provided.

Further, the groove width b measured in the roll axis direction of the spiral groove and the groove pitch p satisfy the formula 0.1 ≦ (b / p) ≦
Preferably, 0.8 is satisfied. The spiral groove is
There is a role to let a certain amount of air in between the layers of the sheet,
By setting the b / p value, which is an index of the ratio occupied by the spiral grooves on the surface of the contact roll, within the above-described range, the winding appearance of the sheet roll body can be improved.
If the b / p value is less than 0.1, the amount of air entrapment is reduced and blocking is likely to be induced. If the b / p value exceeds 0.8, the amount of air entrapment is increased to cause winding defects such as wrinkles. Easier to do. When the above-mentioned b / p value becomes smaller as the winding speed of a sheet such as a film becomes higher, the air entrapment amount becomes appropriately small, and a better winding appearance can be obtained.

The absolute value of the lead angle θ (rad) of the spiral groove is preferably in the range of 0.17 to 0.7.
Here, as shown in FIG. 2, the lead angle θ refers to an angle formed between the circumferential direction of the contact roll and the spiral groove, and is measured based on the circumferential direction of the contact roll. The ridge formed by the helical groove has a function of removing a part of the trapped air toward the end of the sheet roll body, and by setting the lead angle θ within the above range, the elimination ability is reduced. It is optimized and the amount of air entrapment can be adjusted appropriately. When the absolute value of the lead angle θ is less than 0.17, the groove width e tends to be large, and the sheet edge tends to drop into the inclined groove. If it exceeds 0.7,
The ability to remove entrapped air is reduced, and winding defects such as wrinkles are likely to occur.

It is preferable that the absolute value of the lead angle θ is constant in the width direction. If the lead angle θ increases toward the end, the air that has caught near the center of the sheet roll is moved to the end, making it difficult for the air to escape to the outside of the sheet roll.

It is preferable that the surface of the contact roll is formed of an elastomer. As a result, vibrations and the like can be absorbed and the sheet can be uniformly pressed in the width direction of the sheet, so that a sheet roll body having a better winding shape can be obtained. Here, the elastomer is JIS K69.
00 refers to a polymer material described in, for example, NR
(Natural rubber), IR (isoprene rubber), SBR (styrene butadiene rubber), BR (butadiene rubber), CR
Rubber materials such as (chloroprene rubber), IIR (isobutylene isoprene rubber), NBR (acrylonitrile butadiene rubber), and EPDM (ethylene propylene diene resin) can be used.

When the surface of the contact roll is formed of an elastomer as described above, as shown in FIG.
The absolute value of the inclination angle α (rad) of the spiral groove 3 is 0.5 to
1.5 and the groove depth d (mm) is 1-2.
0 and the hardness H of the elastomer
(゜) is preferably in the range of 20 to 60. By setting the absolute value of α, d and H in the above range, the ridge 2 is stably deformed by a certain amount in the same direction, and the uniformity of the surface pressure applied to the sheet roll body in the width direction is maintained. And a sheet roll body having a better winding shape can be obtained. Here, as shown in FIG. 3, the inclination angle α refers to an angle formed between the axial direction of the contact roll and the spiral groove in the longitudinal section of the spiral groove, and is measured with reference to the axial direction of the contact roll. . The hardness H is
Rubber hardness specified in JIS K6301A class.

The edge of the spiral groove is, for example,
As shown in FIG. 3, it is preferable that the portion of the edge R is curved or, as shown in FIG. 4, the portion of the edge C is chamfered. By processing the edge of the spiral groove as described above, it is possible to reduce abrasion that tends to occur on a sheet such as a film. In addition, the occurrence of scratches can be further reduced by performing chamfering a plurality of times or further performing a curved surface processing on an edge generated by the chamfering.

The coefficient of friction of the contact roll surface is 0.6
The following is preferred. When the coefficient of friction exceeds 0.6, the sheet is subjected to excessive tension due to a small difference in peripheral speed at the contact portion between the sheet and the contact roll, and the sheet is likely to have a poor winding appearance or to be easily scratched.

The coefficient of friction referred to here is a value measured by an apparatus whose outline is shown in FIG. In FIG.
The sheet 6 travels in the direction of arrow B, and the roll to be measured (contact roll) 9 is moved out of the roll 8 and the roll 1 into the inlet.
The friction coefficient μ is calculated from the following equation from the outgoing tension T ₁ in the arrow X direction, the incoming tension T _{2 in} the arrow Y direction, and the winding angle β.

Μ = β ^-1 ln (T ₁ / T ₂ ) The contact roll of the present invention can be formed, for example, by cutting or rolling when forming a spiral groove. A method of forming a spiral groove by winding around a cylinder can also be used. Among them,
It is preferable to use a cutting process that is easy to process and can form a highly accurate groove.

As described above, the contact roll of the present invention can be suitably used for manufacturing the sheet roll body 5 by winding the sheet 6 around the core 7 as shown in FIG. In particular, it can be suitably used for winding a film and manufacturing a film roll.

[0027]

EXAMPLES In both Examples and Comparative Examples, the performance of the contact roll was evaluated using a film winding device (slitter). As a sheet, a PET (polyethylene terephthalate) film having a thickness of 15 μm was used, and a winding speed of 200 was used.
m / min, the winding length was set to 10,000 m, and the film was wound as a film roll around a glass fiber reinforced resin core. The winding conditions were as follows: surface pressure of 300 N / m and tension of 50 N.
/ M. Further, as a common specification of the contact roll, an outer diameter of 150 mm, a surface length of 3.1 m, a surface material of NBR having a hardness H of 30 ° and an inclination angle α of 1.2 rad was used. The coefficient of friction with each of the above films was 0.3.

The evaluation of the contact roll was carried out based on the state of occurrence of wrinkles, which were poor in winding of the obtained sheet roll body. This wrinkle was classified into a vertical wrinkle due to an excessive amount of trapped air and its non-uniformity, and a fold wrinkle generated when the end of the film fell into the groove of the contact roll. The wrinkle occurrence rate was calculated based on the number of occurrences of wrinkle defects of each of the above-mentioned ten times after winding was performed.

(Examples 1 to 3) Contact rolls having the groove width e, groove width b, b / p, lead angle θ, and the number of spiral grooves shown in Table 1 were used. The results are shown in Table 1. In each case, no blocking occurred when the amount of trapped air was too small, and the wrinkle generation rate could be suppressed to 40% or less.

(Comparative Examples 1 to 3) As in Example 1, the specifications and results of the contact rolls used are shown in Table 1. In each of Comparative Examples 1 and 2, since the groove width e was large, end wrinkles occurred. Comparative Example 3 is an example in which the shape of the spiral groove was changed at the axial center and both ends of the contact roll. In this case, although the end portion was reduced in groove width e, the end portion was not wrinkled, but the lead angle θ was larger at the end portion than at the center portion, so that the amount of entrapped air was insufficient. , Vertical wrinkles occurred.

[0031]

[Table 1]

[0032]

According to the present invention, a spiral groove is provided on the surface of the contact roll, and the spiral groove is provided symmetrically continuously from the center in the roll axis direction to both ends.
In addition, since the groove width measured in the roll circumferential direction is 30 mm or less, the end of the sheet is hardly dropped into the spiral groove, and a good roll of the roll with less fold can be obtained.

Further, the groove width b measured in the roll axis direction of the spiral groove and the groove pitch p satisfy the formula 0.1 ≦ (b / p) ≦
When 0.8 is satisfied, the amount of air that gets into the sheet roll body can be adjusted appropriately, so that a sheet roll body that does not easily generate wrinkles and blocking can be obtained.

Further, when the absolute value of the lead angle θ of the spiral groove is in the range of 0.17 to 0.7 rad, the trapped air can be uniformly distributed, so that wrinkles and the like occur. It is possible to obtain a sheet roll body which is difficult and has a good winding shape.

When the roll surface is made of an elastomer, vibrations and the like can be absorbed and the sheet can be pressed uniformly in the width direction of the sheet, so that a sheet roll body having a better winding shape can be obtained. Furthermore, when the inclination angle of the spiral groove, the depth of the spiral groove, and the hardness of the elastomer are within a certain range, the amount of air that bites into the sheet roll body is more evenly distributed. It is possible,
The roll of the sheet roll body can be kept good.

When the edge of the spiral groove is curved or chamfered, the sharp portion of the spiral groove hardly comes into contact with the sheet. Can be obtained.

Further, when the coefficient of friction of the roll surface is 0.6 or less, excessive tension is applied to the sheet,
Since the slip is less likely to occur, it is possible to obtain a sheet roll body with less breakage and scratches.

[Brief description of the drawings]

FIG. 1 is a schematic plan view showing grooves of a conventional contact roll.

FIG. 2 is a schematic front view of a contact roll according to an embodiment of the present invention.

FIG. 3 is a schematic longitudinal sectional view showing a part of a spiral groove of the contact roll shown in FIG. 2;

FIG. 4 is a schematic longitudinal sectional view showing a part of a spiral groove of a contact roll according to another embodiment of the present invention.

FIG. 5 is a schematic side view of an apparatus for measuring a coefficient of friction.

FIG. 6 is a schematic side view showing an embodiment when the contact roll shown in FIG. 2 is used for manufacturing a sheet roll body.

[Explanation of symbols]

 1: contact roll 2: ridge 3: spiral groove 5: sheet roll body 6: sheet 7: core 8: output side tension detection roll 9: measured roll 10: entry side tension detection roll θ: lead angle p: groove Pitch b: Groove width of spiral groove measured in roll axis direction e: Groove width of spiral groove measured in roll circumferential direction R: Edge of spiral groove with curved surface C: Spiral groove with chamfered surface Edge β: winding angle

 ────────────────────────────────────────────────── ─── Continued on the front page F term (reference) 3F055 AA01 AA05 AA10 AA12 EA13 3F104 AA01 AA03 AA05 AA07 BA02 BA10 HA03 JA01 JA04 JB07 JC06 JD02 JD20 KA14

Claims (8)

[Claims] 1. A contact roll having a spiral groove on its surface, wherein the spiral groove is provided symmetrically and continuously from a center portion in the roll axis direction to both end portions, and is measured in a roll circumferential direction. A contact groove having a groove width e of 30 mm or less. 2. The groove width b of the spiral groove measured in the roll axis direction and the groove pitch p satisfy the formula 0.1 ≦ (b / p) ≦ 0.8.
The contact roll according to claim 1, which satisfies the following. 3. The spiral groove according to claim 1, wherein the absolute value of the lead angle θ (rad) is in the range of 0.17 to 0.7.
The contact roll described in 1. 4. The contact roll according to claim 1, wherein the roll surface is formed of an elastomer. 5. The absolute value of the inclination angle α (rad) of the spiral groove, the groove depth d (mm), and the hardness H of the elastomer.
The contact roll according to claim 4, wherein the relationship with (゜) is within the range of the following expression. 0.5 ≦ | α | ≦ 1.5 1 ≦ d ≦ 20 20 ≦ H ≦ 60 6. The contact roll according to claim 1, wherein an edge of the spiral groove is subjected to a curved surface processing and / or a chamfering process. 7. The contact roll according to claim 1, wherein the coefficient of friction of the roll surface is 0.6 or less. 8. A method for manufacturing a sheet roll, comprising using the contact roll according to claim 1.