JP2001063884A - Manufacture of sheet roll body and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain stable winding while reducing flaws on the surface of a sheet. SOLUTION: In a method of manufacturing narrow sheet roll bodies 5 by unwinding a wide sheet F from a wide sheet roll body 1, dividing the wide sheet F into a plurality of narrow sheets (f) while conveying the wide sheet F by a carrier roller group 11 comprising a speed regulating roller 3a and a plurality of transfer rollers 3b, and rotating at least the transfer roller 3b disposed downstream of the speed regulating roller 3a, at surface speed faster than the speed regulating roller 3a to wind the narrow sheets (f), a roller formed of metal at least on the surface with surface roughness Ra of 1 μm or less is used as the transfer roller 3b downstream of the speed regulating roller 3a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for manufacturing a sheet roll, and more particularly, to a method for manufacturing a sheet roll which winds a wide sheet such as a synthetic resin film into a plurality of narrow sheets. Related to the device.

[0002]

2. Description of the Related Art Synthetic resin films are used in many fields such as electric component materials, packaging materials, and building materials. As described above, as a method of manufacturing a synthetic resin film to be used for various purposes, from a viewpoint of production rationalization, first, a molten resin is formed by extruding a wide sheet from a die, and once winding as a sheet roll body, A wide sheet is divided from a sheet roll into narrow sheets set for each application, and the sheet is wound again as a sheet roll. A device that divides a wide sheet into a plurality of narrow sheets in this way is called a slitter.

In the slitter, a wide sheet unwound from a wide sheet roll body is conveyed by a group of conveying rolls, and is divided into a plurality of narrow sheets in the course of the conveyance, and each is wound as a sheet roll body. . The transport roll group in the slitter is generally composed of a combination of a speed regulating roll and a transport roll. In particular, a transport roll disposed downstream of the speed regulating roll is rotated at a surface speed higher than the speed regulating roll to tension the sheet. This allows the sheet to be wound around a sheet roll without generating flapping or wrinkling.

However, when the transfer roll is rotated at a surface speed higher than the speed regulating roll as described above, friction is applied to the sheet surface, so that the sheet surface is easily scratched. Especially for applications such as base film for magnetic tape,
Since this flaw affects the performance of the magnetic tape, there is a strong demand for producing a sheet roll having no flaw on the sheet surface. However, if the sheet tension at the time of winding is too small to eliminate scratches, the occurrence of flapping and wrinkles is inevitable, and the operation becomes unstable. It is essential to provide a relative speed difference of

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a method and an apparatus for manufacturing a sheet roll body which solves the above-mentioned conventional problems and enables stable winding while reducing scratches on the sheet surface. To provide.

[0006]

In order to achieve the above object, the present invention provides a method for manufacturing a sheet roll body, comprising: unwinding a wide sheet from a wide sheet roll body, and separating the wide sheet from a speed regulating roll and a plurality of transfer rolls. While being conveyed by a set of conveying rolls, the sheet is divided into a plurality of narrow sheets, and the narrow sheets are wound up while rotating a transfer roll disposed at least on the downstream side of the speed regulating roll at a surface speed higher than the speed regulating roll. In a method for manufacturing a narrow sheet roll body,
As the transfer roll on the downstream side of the speed regulating roll, a roll having at least a metal surface and a surface roughness Ra of 1 μm or less is used.

The sheet roll manufacturing apparatus further includes an unwinding unit that unwinds the wide sheet from the wide sheet roll;
A transport roll group consisting of a speed regulating roll for transporting the wide sheet and a plurality of transport rolls, a slit section for dividing the wide sheet into a plurality of narrow sheets, and a winding for winding the narrow sheet into a sheet roll body A transfer roll that is disposed at least downstream of the speed-regulating roll and rotates at a surface speed higher than the speed-regulating roll, wherein at least the surface is a metal and the surface roughness Ra is 1 μm or less. It is characterized by the following.

[0008] Among the plurality of transfer rolls of the transport roll group as described above, the transfer roll that is disposed at least downstream of the speed regulation roll and rotates at a surface speed higher than the speed regulation roll is used for at least the surface of the transfer roll. And the surface roughness Ra is set to 1 μm or less, so that even if the transfer roll has a relative speed difference with the sheet, it is difficult to scratch the surface of the sheet, and furthermore, the stable winding on the sheet roll body Can also be possible.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the embodiments shown in the drawings.

In the present invention, a sheet refers to a thin-film strip such as a synthetic resin film, a thin metal plate (metal foil), or paper. It is particularly effective when a sheet roll is formed by dividing a wide sheet into a plurality of narrow sheets for a synthetic resin film.

FIG. 1 shows a slitter of a synthetic resin film exemplified as an apparatus for carrying out the present invention. The slitter includes an unwinding unit 10, a conveying roll group 11, a slit unit 1 along a moving direction of a sheet (synthetic resin film).
2. It is configured to arrange the winding units 13 in order.

The unwinding section 10 has a torque motor 2 connected to a support shaft that supports a sheet roll body 1 on which a wide sheet (synthetic resin film) F is wound. Is to be rolled out. Of course, the unwinding means is not particularly limited as long as the torque (tension) can be controlled. For example, a brake such as a powder brake or an electromagnetic brake is connected to the support shaft of the sheet roll body 1. There may be.

In the illustrated example, the transport roll group 11 is composed of one speed regulating roll 3a and a plurality of transport rolls 3b. The sheet is divided into width sheets f. As will be described later, the slit portion 12 is
In this case, the receiving roll 4b also serves as a roller of the transport roll group 11.

The speed regulating roll 3a rotates at the same surface speed as the sheet conveying speed to convey the sheet. In order to convey the wide sheet F at the same speed in this way, the speed regulating roll 3a in the example of FIG. 1 is constituted by a suction roll having suction holes on the surface, and at the same speed while adsorbing the wide sheet F on the roll surface. It is transported.

The speed regulating roll 3a in the transport roll group 11 may be one or plural. Further, the structure is not particularly limited as long as the structure is such that the sheet conveying speed is regulated. For example, as shown in FIG. 2, a pair of nip rolls 3aa and 3ab may be used.
This pair of nip rolls is composed of a fixed roll 3aa and a rocking roll 3ab. While guiding the wide sheet F around the surface of the fixed roll 3aa, the surface is pressed by the rocking roll 3ab. I have.

On the other hand, the transfer roll 3b arranged on the upstream side of the speed regulating roll 3a may have the same surface speed as the sheet conveying speed or may have a speed difference. However, at least the transfer roll 3b disposed downstream of the speed regulating roll 3a is rotated at a speed difference of 0.1% or more higher than the surface speed of the speed regulating roll 3a (accordingly, the sheet conveyance speed). By rotating at such a speed difference, the wide sheet F on the downstream side of the speed regulating roll 3a is rotated.
Is applied to the tongue. By applying the tension, the operation of dividing the wide sheet F into a plurality of narrow sheets f in the slit section 12 is smooth, and the winding operation in the winding section 13 is smoothly performed without generating flapping or wrinkles. be able to.

The slit section 12 is composed of a plurality of blades 4a and a receiving roll 4b. The receiving blade roll 4b has a plurality of grooves along the circumferential direction of the surface, and the blade 4a is installed so as to partially insert each of these grooves. Receiving blade roll 4b
Is a plurality of blades 4a while conveying the wide sheet F at the same speed.
Divides the sheet into a plurality of narrow sheets f corresponding to each groove. As the slit portion 12, only a plurality of blades 4a may be arranged without providing the receiving blade roll 4b as shown, or a pair of rotating blades may be arranged corresponding to the division width. .

In the last winding section 13, a torque motor 6 is connected to a support shaft for supporting a sheet roll body 5 for winding the narrow sheet f, and the winding is performed while controlling the winding torque by the torque motor 6. Has become. Of course, the drive source is not limited to a torque motor as long as it can be wound by controlling the torque. For example, an induction motor or an AC servomotor may be used under torque control. In addition, a contact pressure roll 7 made of a rubber or metal free roll is provided, and the narrow sheet f is wound up while contacting the sheet roll body 5.

According to the present invention, in the above-described apparatus, at least the surface of the transfer roll 3b arranged at least on the downstream side of the speed regulating roll 3a is made of metal, and the surface roughness Ra is 1 μm or less. This transfer roll 3b
In order to apply tension to the sheet before winding, the sheet rotates so as to have a speed difference of 0.1% or more with respect to the surface speed of the speed regulating roll 3a.

Although the above configuration is indispensable for the transfer roll 3b on the downstream side of the speed regulating roll 3a, the transfer roll 3b disposed upstream of the speed regulating roll 3a may have the same configuration. In particular, in the case where an eccentric roll is attached to the unwinding portion, the transfer roll 3b in the vicinity of the unwinding has the same configuration with respect to the speed fluctuation of the sheet due to the eccentricity of the unwinding, so that the generation of scratches in the vicinity of the unwinding It is effective in suppressing

The transfer roll 3b may be formed of a metal at least at the surface layer, and the other components may be made of a material other than metal. Of course, the entire roll may be made of metal.

The transfer roll 3b disposed downstream of the speed regulating roll 3a rotates at a surface speed higher than the speed regulating roll 3a, that is, at a surface speed higher than the sheet conveying speed. Friction occurs, and the sheet surface is scratched as it is. However, as described above, the surface of the transfer roll 3b is made of hard metal, and the surface roughness Ra is set to 1 μm or less, so that the surface becomes smooth, and the frictional resistance when contacting the sheet surface is reduced. Makes it harder to scratch. In addition, since the surface layer is made of metal, the abrasion resistance is higher than that of a rubber or resin roll, and there is no dimensional change over time. Operation can be stabilized.

In the present invention, the transfer roll having a metal surface as described above and having a surface roughness Ra of 1 μm or less, more preferably, has a surface friction coefficient μs of 0.2 or less. Thus, the friction coefficient μs of the surface is set to 0.
By setting the value to 2 or less, the slip between the sheet and the sheet can be further improved, and the above-mentioned scratches generated on the sheet surface can be further reduced.

In the present invention, more preferably, all the transfer rolls 2b constituting the transport roll group 11 are used.
However, the surface speed is set to ± 0.
It is preferable that the speed difference be within 5%. When the transfer roll 3b has a surface speed difference of more than 0.5% with respect to the speed regulation roll 3a as described above, not only is the sheet surface easily scratched, but also the sheet speed increases as the speed difference further increases. It is easy to charge static electricity or to cause breakage. Therefore, by regulating the surface speed difference of all the transfer rolls 2b to within ± 0.5% with respect to the speed regulation roll 3a, it is possible to prevent electrostatic charge and breakage.

In the present invention, the surface roughness Ra and the surface friction coefficient μs refer to values measured as follows.

The surface roughness Ra is represented by Y = f (x) using the center line of the roughness curve as the X-axis and the direction of the longitudinal magnification as the Y-axis, based on the measurement method specified in JIS. Means the value given by the following equation.

[0027]

(Equation 1) Here, L is the measurement length.

The surface friction coefficient μs is determined by winding a belt-shaped sheet around a roll at a winding angle θ, suspending a weight having a weight of W (g) at the lower end thereof, connecting a load meter to the upper end side, and pulling. At that time, the friction force T measured by the load meter is measured, and is obtained by the following equation.

Μs = (1 / θ) ln (T / W) (2)

[0030]

EXAMPLE A wide polyester film having a width × thickness of 2200 mm × 10 μm is divided into three narrow films having a width of 600 mm while being conveyed at a sheet conveying speed of 200 m / min. In the configuration of FIG. 1, three types of apparatuses of Example 1 and Comparative Examples 1 and 2 were used in which the surface material and the surface speed difference of the transfer roll 3b downstream of the speed regulating roll 3a were different as shown in Table 1. .

The surface speed difference between the transfer roll 3b on the upstream side of the speed regulating roll 3a and the speed regulating roll 3a was set to the same 0.1% in each of the apparatuses of Example 1 and Comparative Examples 1 and 2. .

After producing narrow sheet rolls using three types of apparatuses, the sheet rolls were rewound and the state of the scratches occurring on the film surface was measured according to the following measurement criteria. The results shown in Table 1 were obtained. Was done.

Measurement criteria ◎: The number of scratches per 100 m is 0 or less Δ: The number of scratches per 100 m is 1 to 5 ×: The number of scratches per 100 m is 6 or more

[0034]

[Table 1]

[0035]

As described above, according to the present invention, among the transfer rolls of the transport roll group, the transfer roll that is disposed at least downstream of the speed control roll and that rotates at a surface speed difference higher than the speed control roll is used. At least the surface is made of metal, and the surface roughness Ra is set to 1 μm or less, so that scratches generated on the sheet surface can be reduced, and the sheet can be stably wound on a sheet roll.

[Brief description of the drawings]

FIG. 1 is a schematic view showing an example of a sheet roll body manufacturing apparatus of the present invention.

FIG. 2 is a schematic view showing another example of the sheet roll body manufacturing apparatus of the present invention.

[Description of Signs] 1 (wide) sheet roll body 2 torque motor 3a speed regulating roll 3b transfer roll 4a blade 4b receiving blade roll 5 (narrow width) sheet roll body 6 torque motor 10 unwinding section 11 transport roll group 12 Slit part 13 Winding part F Wide sheet f Narrow sheet

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Kojun Ishida 1-1-1 Sonoyama, Otsu-shi, Shiga F-term in the Shiga Plant of Toray Industries (reference) 3F055 AA05 BA12 FA05 3F103 BA01 BA04 BA31 CA12 EA15 3F105 AA04 BA02 BA09 CA06 CB01 DA07 DA19

Claims (7)

[Claims] 1. A wide sheet is unwound from a wide sheet roll body, and the wide sheet is divided into a plurality of narrow sheets while being conveyed by a conveying roll group including a speed regulating roll and a plurality of transfer rolls. In a method for manufacturing a narrow sheet roll body that winds a sheet while rotating a transfer roll in which a sheet is disposed at least on the downstream side of the speed regulating roll at a surface speed higher than the speed regulating roll, the transfer roll on the downstream side of the speed regulating roll A method of manufacturing a sheet roll body using a roll having at least a metal surface and a surface roughness Ra of 1 μm or less. 2. The method for manufacturing a sheet roll body according to claim 1, wherein a difference in surface speed between a transfer roll disposed downstream of the speed regulation roll and the speed regulation roll is 0.1% or more. 3. The method for manufacturing a sheet roll body according to claim 1, wherein a surface speed difference of all the transport rolls of the transport roll group with respect to the speed regulating rolls is within ± 0.5%. 4. An unwinding unit for unwinding a wide sheet from a wide sheet roll body, a transport roll group including a speed regulating roll for transporting the wide sheet and a plurality of transfer rolls, A transfer section comprising a slit section for dividing the sheet and a winding section for winding the narrow sheet around a sheet roll body, disposed at least downstream of the speed regulating roll, and rotating at a surface speed higher than the speed regulating roll. The roll is made of metal at least having a surface roughness Ra
The apparatus for manufacturing a sheet roll body comprising a roll having a thickness of 1 μm or less. 5. The sheet roll body manufacturing apparatus according to claim 4, wherein a difference in surface speed between a transfer roll disposed downstream of the speed regulation roll and the speed regulation roll is 0.1% or more. 6. The sheet roll manufacturing apparatus according to claim 4, wherein a surface friction coefficient μs of a transfer roll disposed downstream of the speed regulating roll is 0.2 or less. 7. The sheet roll manufacturing apparatus according to claim 4, wherein the speed regulating roll comprises a suction roll having a suction hole on its surface or a pair of nip rolls.