JP2003212409A - Manufacturing method and manufacturing apparatus of sheet roll body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method and a manufacturing apparatus of a sheet roll body providing stable winding while reducing flaws and electrification of a sheet surface. <P>SOLUTION: The manufacturing apparatus of the sheet roll body has at least a plurality of conveying rollers conveying a long sheet, a winding device winding the long sheet conveyed from the conveying rollers, and a contact pressure roller pressing against the sheet roll body formed by the winding device. It is characterized by that at least one roller of the conveying rollers or the contact pressure roller has recessed and projecting parts on a surface, a maximum circumferential length L of the recessed part is ≤100 mm in a contact portion with the sheet, and a boundary between the projecting part and the recessed part is a curved face. <P>COPYRIGHT: (C)2003,JPO

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 body, and more particularly to an apparatus and a method for manufacturing a sheet roll body that conveys and winds a wide sheet such as a synthetic resin film.

[0002]

2. Description of the Related Art Synthetic resin films are used in many fields such as electric parts materials, packaging materials and magnetic recording materials.

From the viewpoint of production rationalization, a method for producing a synthetic resin film used for various purposes as described above is as follows.
First, a molten resin is extruded into a wide sheet from a die, conveyed, and conveyed between a plurality of conveying rollers and a contact pressure roller, and is rolled up as a sheet roll body while pressing the contact pressure roller. The sheet is unwound, conveyed between a plurality of conveying rollers, divided into a plurality of narrow sheets, and rewound as a sheet roll body. FIG. 1 shows an example of a method for producing a synthetic resin film used for various purposes in this way.
0, referring to FIG. 11, first, molten resin is extruded from the die 15 into a wide sheet and conveyed by using the plurality of conveying rollers 10 and the pressure contact rollers 11, and the pressure contact roller 1
After being rolled up as a sheet roll body 13 while pressing 1, the sheet roll body 13 is unrolled using a slit device shown in FIG. 11 and conveyed between a plurality of conveyance rollers 10 to obtain a plurality of narrow sheets. Divide into 1 and contact pressure roller 11 again
It is a sheet roll that is rolled up while pressing. Further, in the processing step, the narrow sheet roll body is unwound, conveyed between a plurality of conveyance rollers, subjected to processing such as coating, vapor deposition, and laminating, and then rewound as a sheet roll body. The length sheet is in contact with a large number of conveying rollers and contact pressure rollers during the manufacturing and processing steps.

The conveyance or contact with the pressure roller may cause scratches on the sheet surface or electrostatic charge on the sheet surface, which leads to deterioration of sheet quality.

Conventionally, in order to prevent the sheet from being scratched due to contact with the roller, a conventional method is disclosed in Japanese Patent Laid-Open No. 2001-27773.
A technique as disclosed in Japanese Patent Publication No. 50 is known. This technique rounds or chamfers the groove edges of spiral grooved rollers,
Even if the edge of the sheet falls into the groove, no damage occurs. However, under the demand for high quality, the fall of the sheet into the groove itself causes deformation, wrinkles, and minute scratches of the sheet.

Further, if the flat roller is formed without grooves such as grooves, air will enter between the rollers and the sheet when the sheet is conveyed at a high speed, leading to other problems such as meandering.

Regarding the problem of charging, Japanese Patent Laid-Open No. 8-
In Japanese Patent No. 268608, it is described that the substance is located on the negative side of the sheet in the charging order and is used as the roller surface to reduce the charge. However, the required level for charging has been increasing day by day, and it has become necessary to further reduce the charging. In such a situation, it is not sufficient to use the substance located on the negative side as the roller surface.

[0008]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art, and to provide a sheet roll manufacturing apparatus and manufacturing method capable of performing stable winding while reducing scratches and electrification on the sheet surface. To provide.

[0009]

The present invention adopts the following configurations in order to achieve the above object.

That is, according to the present invention, at least a plurality of conveying rollers for conveying a long sheet, a winding device for winding the long sheet conveyed from the conveying rollers, and a sheet formed by the winding device. In a manufacturing apparatus for a sheet roll body, which comprises at least a contact pressure roller for pressing a roll body, at least one roller of the transport roller and the contact pressure roller has an uneven surface, and the concave portion is a sheet. The sheet roll manufacturing apparatus is characterized in that the maximum length L in the circumferential direction at the contact portion is 100 mm or less and the boundary between the convex portion and the concave portion is a curved surface.

In the above sheet roll manufacturing apparatus, the conveying or contact roller preferably has a curvature R at the boundary between the convex portion and the concave portion of 1 mm or more and 2000 mm or less, preferably R.
Is 5 mm or more and 500 mm or less. Alternatively, the coefficient of friction of the convex portion of the conveying or pressure roller may be 0.7 or less.

Alternatively, at least a plurality of conveying rollers for conveying the long sheet, a winding device for winding the long sheet conveyed from the conveying rollers, and a sheet roll body formed by the winding device are pressed. In a manufacturing apparatus for a sheet roll body having at least a contact pressure roller to be applied, at least one of the conveying roller and the pressure roller has a resin or elastomer tubular body fitted on the surface of a corrugated roller. Or a resin or elastomer sheet wound and fixed.

More preferably, the resin or elastomer fitting body or sheet is a porous body.

Alternatively, at least a plurality of conveying rollers for conveying the long sheet, a winding device for winding the long sheet conveyed from the conveying rollers, and a sheet roll body formed by the winding device are pushed. In a manufacturing apparatus for a sheet roll body having at least a contact pressure roller to be applied, at least one of the transport roller and the contact pressure roller is made of a substance having a charge sequence similar to a charge sequence on a sheet surface in contact with the substance. An apparatus for manufacturing a sheet roll body, characterized in that it is included on at least the surface of a roller.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows an example of a conveying or pressure roller in the sheet roll body manufacturing apparatus of the present invention. FIG. 2 is a sectional view of the roller shown in FIG.
The roller shown in FIG. 1 comprises a core metal and a roll surface material 6, and a groove surface-shaped recess 2 is provided in the roll surface material 6 (see FIG. 2). The structure of the roll in the present invention is not limited to this, but such a structure is preferable because the surface unevenness processing becomes easy. In the roll shown in FIG. 1, rubber is used as the roll surface material 6, but the roll surface material 6 may be metal, resin, or the like, and is not particularly limited.

The shape of the recess is not particularly limited to a groove, and may be a recess such as a circular shape as shown in FIG. 5 or a polygonal shape into which accompanying air can be dropped, and the shape is not limited.

The maximum circumferential length L of this recess is 100.
If it is less than mm, the sheet will not fall into the recess,
It is possible to convey and wind the sheet without folding or wrinkling. Further, when a web such as a thin film or a low-rigidity film which easily falls into a recess is conveyed as a sheet, L is preferably 50 mm or less.
In the entire width of the roll, the regions such as the both ends of the roll that are not in contact with the sheet do not affect folding and wrinkles, so L does not necessarily have to fall within the above range.

The maximum circumferential length L of the recess is the maximum circumferential length of the recess in a cross section taken along a line perpendicular to the center line of the roll. In the case of FIG. 5, the length in the circumferential direction varies depending on the cut position, but the value when cut at the position where the maximum value is taken is L.

The recess means, as indicated by 2 in FIG. 1,
It is from the beginning of the curve that transitions from the convex portion to the concave portion to the end of the curve that transitions from the concave portion to the convex portion. In addition, the boundary between the convex portion and the concave portion refers to a curve that transitions from the convex portion to the concave portion.

Further, as shown in FIG. 2, since the boundary between the concave portion 2 and the convex portion 3 is a curved surface, it is possible to prevent scratches and electrification due to contact with the sheet and friction. The curvature R of this curved surface is preferably 1 mm or more in a cross section taken along a line perpendicular to the boundary line between the concave portion and the convex portion. Here, the cross section taken along a line perpendicular to the boundary line between the concave portion and the convex portion is a cross section taken along a line vertical to the concave portion as shown by AA in FIG. Shows the curvature seen in the AA cross section as shown in FIG. If it is 1 mm or less, the effect as a curved surface becomes small, which causes scratches.
More preferably, when the curvature R of the curved surface is set to 5 mm or more, it can be transported without causing scratches even in applications such as magnetic recording material applications in which minute scratches are a problem.

Further, a large curvature is a good direction for the occurrence of scratches, but if the curvature R is too large at 2000 mm or more, a distance is required to obtain the necessary depth of the concave portion 2, and the concave portion 2 is unnecessarily formed. It is not preferable because it becomes necessary to increase. If the recess 2 is made large, the sheet is likely to fall into the recess 2, and wrinkles may be generated due to the fall to make it difficult to convey the sheet. Especially, when the sheet is thin or the sheet having low rigidity is conveyed. It tends to be a problem, and preferably the curvature R is
Is preferably 500 mm or less.

Further, when the friction coefficient μs of the convex portion 3 is 0.7 or less, the frictional force between the sheet and the roller is reduced, which is effective in preventing scratches and electrification. The method of measuring the friction coefficient μs will be described later.

FIG. 3 shows another example of the conveying or contact pressure roller in the sheet roll body manufacturing apparatus of the present invention. According to this figure, the resin tubular body 7 is fitted and adhered to the surface of the uneven roller. In the roller, the boundary between the concave portion 2 and the convex portion 3 is not curved, but by covering the tubular body from above, the roller surface is
The boundary is a curved surface. By doing so, it is possible to reduce the cost of curved surface processing, and even if there is a problem such as scratches on the roller surface during use of the roller, it is only necessary to replace the tubular body, so there is an advantage that it can be easily repaired. is there.

The concavo-convex roller shown in FIG. 3 comprises a roll surface material 6 and a core metal, and the roll surface material 6 can be made of rubber, resin or metal.

The tubular body 7 is not particularly limited as long as it can be adhered to the surface of the roller such as a heat shrinkable tube made of resin or a thin rubber tube or can be fixed with an adhesive or the like. The coating layer on the roller surface does not have to be a tubular body, and a method of winding the sheet around the roller surface with an adhesive may be used. Further, as shown in FIG. 4, when the tubular body or the sheet is the porous body 8, the associated air that enters between the sheet rollers can be dropped into the holes, and the sheet can be conveyed at a higher speed. As the porous body 8, a thin rubber tube or a resin tube may be drilled, or a porous material such as foam or woven cloth may be used.

Further, by using at least the surface of the conveying roller or the contact pressure roller, a material containing a substance similar to the charge train of the contacting sheet surface, it is possible to reduce the charge due to the contact between the sheet and the roller. Become. Here, the substance that is close to the electrified train on the sheet surface may be the same substance as the sheet surface, or a substance that does not easily electrify the sheet surface as a result of the electrified train may be selected. Here, the substance having a similar charge sequence means that the charge amount of the sheet roll body is ± 2 kv when evaluated by the following charge characteristic test.
Refers to the following substances. When the roller is composed of a core metal and the roll surface material 6, such a substance may be kneaded into the roll surface material 6.

The charging characteristic test is to prepare a sheet roll body of a sheet to be evaluated in a non-charged state, attach the sheet roll body to the unwinding side of a rewinding device having an unwinding portion and a winding portion, and Is wound around the core, the surface of the roll made of the substance to be tested is pressed with a force of 300 N / m, and the potential of the winding roll is measured during winding,
The electric potential when wound up for 250 m is taken as the charge amount of the test result.

Further, in the present invention, the friction coefficient μs is obtained by winding the belt-shaped sheet on the roll at the winding angle θ, suspending the weight having the weight W (g) at the lower end, and connecting the load meter to the upper end to pull it. , The frictional force T measured by the load cell at that time
(G) is measured and calculated by the following formula.

Μs = (1 / θ) ln (T / W)

[0031]

Example A test was carried out by changing the surface and the material of the test apparatus having unwinding and winding and having three conveying rollers in the middle as shown in Table 1. The sheet used for the test was a polyester film having a thickness of 25 μm and a width of 1000 mm, and the test was carried out while being conveyed at a speed of 200 m / min. The evaluation was carried out by measuring the charging potential of the sheet roll body using an electrometer and feeding the sheet roll body after winding, and counting the number of scratches per 10 m of the conveying portion at 200 m / min.

In Example 1, the roll having the spiral groove shown in FIG. 1 was used as a conveying roll, and the groove shape is shown in FIG.

In Example 2, a roll coated with the tubular body shown in FIG. 3 was used as a transport roll, and its groove shape is shown in FIG.

In Comparative Example 1, the roll having the spiral groove shown in FIG. 1 was used as the conveying roll, and the groove shape is shown in FIG.

In Comparative Example 2, the roll having the spiral groove shown in FIG. 1 was used as the conveying roll, and the groove shape is shown in FIG.

The results of the implementation are shown in Table 1.

[0037]

[Table 1]

Pattern 1 is shown in FIG. Pattern 2
Is shown in FIG. Pattern 3 is shown in FIG. Pattern 4 is shown in FIG. In addition, the concave width indicates the maximum length L when the concave is viewed from the circumferential direction. Criterion for judging scratches ◎: The number of scratches per 10 m is 0 or less Δ: The number of scratches per 10 m 1 to 5 x: 6 or more scratches per 10 m

[0039]

As described above, according to the present invention, it is possible to suppress the occurrence of scratches and electrification on the surface of a sheet to be conveyed, and to enable stable winding.

Further, since the conveying or contact pressure roller contains a substance having a charging train similar to the charging train on the surface of the sheet with which it is in contact, at least on the surface of the roller, the charging due to contact / peeling to the sheet is reduced. can do.

[Brief description of drawings]

FIG. 1 is a side view showing an example of a roller used in a sheet roll manufacturing apparatus of the present invention.

FIG. 2 is a sectional view of the roller shown in FIG.

FIG. 3 is a side view showing another example of a roller used in the sheet roll body manufacturing apparatus of the invention.

FIG. 4 is a side view showing still another example of a roller used in the sheet roll body manufacturing apparatus of the invention.

FIG. 5 is a side view showing still another example of the roller used in the sheet roll body manufacturing apparatus of the invention.

FIG. 6 is a sectional shape view of a roller recess used in Example 1.

FIG. 7 is a sectional shape view of a roller concave portion used in Example 2;

8 is a sectional shape view of a roller recess used in Comparative Example 1. FIG.

9 is a sectional shape view of a roller recess used in Comparative Example 2. FIG.

FIG. 10 is an example of a synthetic resin film manufacturing apparatus.

FIG. 11 is an example view of a slit device.

12 is a cross-sectional view of the roller shown in FIG. 1, taken along the line AA.

[Explanation of symbols]

1: Laura 2: Recess 3: convex part R: Curvature of boundary between convex and concave L: Maximum length of the recess as viewed from the circumferential direction 6: Roller surface material 7: Tubular body or sheet 8: Porous tubular body or sheet 9: Hole 10: Conveyor roller 11: Contact roller 12: Casting drum 13: Sheet roll body 14: Film 15: Die 16: Cutter

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Claims (8)

[Claims] 1. A plurality of conveying rollers for conveying a long sheet, a winding device for winding a long sheet conveyed from the conveying roller, and a sheet roll body formed by the winding device. In a manufacturing apparatus for a sheet roll body having at least a contact pressure roller, at least one of the transport roller and the contact pressure roller has an uneven surface, and the recess has a circumferential direction at a contact portion with the sheet. Has a maximum length L of 100 mm or less, and the boundary between the convex portion and the concave portion is a curved surface. 2. The roller has a curvature R of 1 at a boundary between a convex portion and a concave portion.
The sheet-roller manufacturing apparatus according to claim 1, wherein the sheet-roller manufacturing apparatus has a thickness of not less than mm and not more than 2000 mm. 3. The apparatus for manufacturing a sheet roll body according to claim 1, wherein the convex portion has a friction coefficient of 0.7 or less. 4. A plurality of conveying rollers for conveying a long sheet, a winding device for winding a long sheet conveyed from the conveying rollers, and a sheet roll body formed by the winding device. In a sheet roll manufacturing apparatus including at least a contact roller, at least one of the transport roller and the contact roller is a roller having an uneven surface and a resin or elastomer tubular body fitted to the surface of the roller. An apparatus for manufacturing a sheet roll body, which is obtained by winding and fixing a resin or an elastomer sheet. 5. The apparatus for manufacturing a sheet roll body according to claim 4, wherein the resin or elastomer tubular body or the resin or elastomer sheet is a porous body. 6. A plurality of conveying rollers for conveying a long sheet, a winding device for winding a long sheet conveyed from the conveying roller, and a sheet roll body formed by the winding device, pressed against each other. In a manufacturing apparatus for a sheet roll body having at least a contact pressure roller, at least one of the transport roller and the contact pressure roller applies a substance having a charge train similar to the charge train of a sheet surface in contact with the roller. An apparatus for manufacturing a sheet roll body, characterized in that it is contained on at least the surface. 7. The sheet roll according to claim 1, wherein the roller contains a substance having a charge train that is similar to the charge train on the surface of the sheet with which it comes into contact, at least on the surface of the roller. Body manufacturing equipment. 8. A method of manufacturing a sheet roll body, which comprises manufacturing a sheet roll body using the manufacturing apparatus according to any one of claims 1 to 7.