WO2005040018A1

WO2005040018A1 - Web smoothing roller, and web roll producing device and method

Info

Publication number: WO2005040018A1
Application number: PCT/JP2004/015391
Authority: WO
Inventors: Mamoru Kawashita; Masayoshi Kimura; Toshihiro Hayashi; Shintaro Kuge
Original assignee: Toray Industries, Inc.
Priority date: 2003-10-28
Filing date: 2004-10-19
Publication date: 2005-05-06
Also published as: KR20060093333A; CN1874945A; US20070131809A1; EP1679275A1; EP1679275A4

Abstract

A web smoothing roller comprising a rotary roller main body, a fiber structure with stretchability, covering the outer peripheral surface of the rotary roller main body, and an expansion/contraction means for expanding/contracting the fiber structure in the direction of the rotation center axis of the rotary roller main body.

Description

Specification

Roller for web web stretching, web roll manufacturing apparatus, and manufacturing method

Technical field

The present invention relates to a web stretching roller, a web roll manufacturing apparatus, and a manufacturing method.

Background art

[0002] In the manufacturing process of sheet-like materials (hereinafter, referred to as web) such as plastic films and paper, various rollers are used to handle the web, for example, for transporting the web and for kneading. Is used. When handling the web with the roller, the web may be scratched. The occurrence of scratches on the web results in lower product yields and lower operability in the manufacturing process.

[0003] As means for preventing the generation of a shear in the web manufacturing process or extending the generated shear, a tenter or a cross guider that pulls both ends in the width direction of the web outward in the width direction is in contact with the entire width of the web. Expander rollers are known. The expander roller includes a bending type and a flat type. The bending type expander opening roller also generates a rotating roller force having a curved rotation center axis, and applies a tension in the width direction to the web contacting the rotating roller. The flat-type expander roller has a structure in which the roller shell expands and contracts in the direction of the central axis with rotation as the rotating roller force has a straight rotation central axis, and applies a tension in the width direction to the web contacting the rotating roller. Give.

[0004] Roller force for web stretching using a flat expander roller is disclosed in Patent Literature 1, Patent Literature 2, Patent Literature 3, or Patent Literature 4. The roller disclosed in Patent Literature 1 or Patent Literature and Patent Literature 3 has a large number of elastic rods that are spaced apart in the circumferential direction of the roller and extend in parallel with the axial direction of the roller. The roller disclosed in Patent Document 4 has a rubber knob.

[0005] However, in the conventional technology described above, in products requiring higher quality, It is difficult to achieve the extension and the prevention of scratches.

[0006] That is, the conventional bending type expander roller has the following problem.

Since it is premised that the driving required for the rotation is very large, the equipment cost is high. Excessive tension in the width direction is generated at the center of the web structurally, and the web is distorted. The effect of stretching the web end is small. The speed difference between the peripheral speed of the roller and the web transport speed becomes large, especially at the end of the web, and the contact surface between the roller and the web tends to slip immediately. Since the web pass lines between the front and rear rollers are different between the center and both ends of the roller, it is easy to cause thickening at the end of the web.

[0007] The flat-expandable rollers disclosed in Patent Document 1 or Patent Document 2 and Patent Document 3 are intended to solve the drawbacks of the bending type expander roller. However, in this flat expander roller, since a large number of rods having elasticity are arranged with a gap, the widening action is stepwise, and the outer periphery of the roller tends to be uneven. There is. Further, in the case where the roller shell is provided with a groove for holding the rod, there is a problem that the rod rubs against the groove and generates dust.

[0008] Patent Document 4 discloses a flat expander roller using a rubber noise in order to solve these problems. However, this method also requires a large torque required for rotation. In particular, in order to use this roll for manufacturing a thin film having a low winding tension, it is necessary to drive this roll. Therefore, the cost of manufacturing equipment increases.

[0009] Further, both the expander roller of the method disclosed in Patent Document 1 or Patent Document 2, and the expander roller of the method disclosed in Patent Document 3, and the expander roller of the method disclosed in Patent Document 4, It is formed from a simple continuum of hard material such as metal or rubber. For this reason, there is a problem that if the web is easily scratched, the power and the amount of width cannot be increased.

Patent Document 1: Japanese Patent Publication No. 44-20877

Patent Document 2: U.S. Pat.No. 3,344,493

Patent Document 3: Patent No. 3,028,483

Patent Document 4: Japanese Utility Model Publication No. 57-11966

Disclosure of the invention Problems the invention is trying to solve

[0010] An object of the present invention is to provide a web stretching roller that can reduce the web shear over the entire width and reduce the occurrence of scratches. Another object of the present invention is to provide a manufacturing apparatus for manufacturing a web roll with less scratches. Still another object of the present invention is to provide a production method for producing a web roll with less scratches.

Means for solving the problem

[0011] The web stretching roller of the present invention includes a rotating roller body, a stretchable fiber structure that covers the outer peripheral surface of the rotating roller body, and a rotation of the rotating roller body that rotates the fiber structure. And a stretching means for stretching in the direction of the central axis.

[0012] In the web stretching roller of the present invention, it is preferable that the fibrous structure is a tubular fabric.

[0013] In the web stretching roller of the present invention, the tubular fabric is preferably seamless.

In the web stretching roller of the present invention, it is preferable that the tubular fabric is an elastic yarn or a yarn containing the elastic yarn.

In the web stretching roller of the present invention, it is preferable that the tubular fabric is a knitted fabric.

[0016] In the web stretching roller of the present invention, it is preferable that the knitted material is an elastic yarn or a yarn including the elastic yarn.

[0017] In the web stretching roller of the present invention, the knitted fabric is preferably seamless.

[0018] In the web stretching roller of the present invention, the expansion / contraction means is disposed on both outer sides in the rotation center axis direction of the rotating roller main body, and with respect to the rotation center axis inclined with respect to the rotation center axis. A rotatable inclined collar force is formed, the end of the fiber structure is gripped by the inclined collar, and an outer package surrounding the rotating roller body is formed by the fiber structure and the inclined collar. Is preferred,.

In the web stretching roller of the present invention, the fibrous structure and the web Is preferably 0.3 to 0.7, and the static friction coefficient force between the fibrous structure and the rotating roller body is preferably 0.4 or less.

[0020] The web roll manufacturing apparatus of the present invention includes a web supply device that continuously supplies a web, a web transport device that transports the web that is continuously supplied from the supply device, and a web transport device that continuously feeds the web. And a web take-up device for continuously winding the conveyed web into a roll form, wherein at least one point of the conveying device is used to stretch the web of the present invention. A roller is provided.

[0021] The web supply device for continuously supplying the web in the web roll manufacturing apparatus of the present invention is a film forming device for continuously forming the web, or a web for continuously unwinding the web from the web roll. Means unwinding device.

[0022] In the web roll manufacturing apparatus of the present invention, it is preferable that the web stretching roller is arranged so as to be able to press against the surface of the web roll formed in the web winding device.

[0023] The method for producing a web roll according to the present invention includes: a web supply step of continuously supplying web; a web transport step of continuously transporting webs continuously supplied by the supply step; In a method for manufacturing a web roll, comprising: a web winding step of continuously winding a web conveyed continuously in a conveying step into a roll form, at least one point of the web conveying step includes the present invention. A roller for stretching the web is provided.

[0024] In the method for producing a web roll of the present invention, the web supply step of continuously feeding the web is a film forming step of continuously forming the web, or a web unwinding process of continuously winding the web from the web roll. Means a process.

[0025] In the web roll manufacturing method of the present invention, the web is preferably a polyester film.

[0026] The elasticity of the fiber structure in the present invention is defined as follows. The fiber structure is cut into a square with a length of 120 mm and a width of 120 mm to make a sample sheet for evaluating the elasticity. Place the obtained sample sheet horizontally, and in a state where tension is not applied to the sample sheet (no tension state), the two opposite sides of the sample sheet are evenly spread across the entire width with a vise, and do not slip during the experiment. To grip. At this time, it is not gripped with a vise Hold with a vice so that the length of the part becomes 100mm. In this state, apply tension to the sample sheet by moving the vise in the two opposite directions (tension direction) slowly enough that the speed does not affect the result. As a result, the sample sheet is stretched to 11 Omm or more without breaking, and after stretching to 11 Omm, the vise is moved in the direction opposite to the tension direction at a speed of ImmZ seconds to act on the sample sheet. Then, when the tension is released and the tension is returned to the non-tension state again, when the interval in the direction in which the tension is applied to the portion not gripped by a vice in the direction in which the tension is applied is restored to the range of 100 mm to 105 mm, The fibrous structure is evaluated as having elasticity in the tension direction.

When the sample sheet covers the outer peripheral surface of the rotating roller body, the direction along the rotation center axis of the rotating roller body is the length direction of the sample sheet, and the direction along the rotating direction of the rotating roller body is the sample. It is manufactured so as to be in the width direction of the sheet. When elasticity is observed in the length direction, the fiber structure is evaluated as having elasticity.

[0028] The above experiment is basically performed in the air at a temperature of 25 ° C and a relative humidity of 40%. However, if it is clear that the condition of use of the roller is far from this, the operation shall be performed under the temperature, humidity and other environment under the condition of use. If the experiment cannot be performed properly, such as when the fibrous structure cannot be cut into the above dimensions, the fiber structure is cut into experimental dimensions and the above values are evaluated in proportion to the dimensions in the tension direction.

[0029] When a fiber structure having elasticity in only one direction is used as the fiber structure according to the present invention, the direction in which elasticity is recognized is a direction close to the rotation center axis direction of the rotary roller body. Use it to face. A fiber structure in which elasticity is recognized in both directions perpendicular to each other is more preferable.

[0030] In the present invention, a fiber structure is a general term for a fabric such as a woven fabric, a knitted fabric, or a nonwoven fabric made of natural fibers or chemical fibers. Knitting is often an extensible fibrous structure according to the present invention. Many woven and non-woven fabrics do not have elasticity. However, woven fabrics and nonwoven fabrics made of elastic yarns having elasticity or yarns containing the elastic yarns have elasticity and can be used as the fiber structure having elasticity according to the present invention. is there.

[0031] In the present invention, the cylindrical fabric means that the inside portion excluding at least both ends is cylindrical. Refers to fabric. Taking a knitted fabric as an example, as a tubular knitted fabric, a sheet-shaped knitted fabric formed by sewing or other methods into a tubular shape, or a tubular knitted fabric knitted by a tubular knitting machine, that is, There is a seamless tubular knitting.

[0032] In the present invention, the outer package body refers to a structure having one or more member strengths that substantially covers at least a side surface of the rotating roller body.

[0033] The elastic yarn forming the fibrous structure in the present invention is defined as follows. The yarn used for the fiber structure is cut to a length of 120 mm to prepare a sample yarn. The obtained sample yarn is placed in the horizontal direction, and both ends of the sample yarn are gripped with a vice in a state where no tension acts on the sample yarn (no tension). At this time, grip with a vice so that the length of the part that is not gripped with a vise is 100 mm. In this state, the vise is moved in the length direction (tensile direction) of the sample yarn slowly enough that the speed does not affect the result, and tension is applied to the sample yarn. As a result, the sample yarn is stretched to 110 mm or more without breaking, and after stretching to 110 mm, the vise is moved in the direction opposite to the tension direction at a speed of ImmZ seconds to act on the sample yarn. If the tension in the direction where tension is applied to the part that is not gripped by a vice is restored to the range of 100 mm to 105 mm when the tension applied is released and returned to the non-tension state again, The yarn is evaluated as an elastic yarn.

[0034] The above experiment is basically performed in the air at a temperature of 25 ° C and a relative humidity of 40%.

However, if it is clear that the condition of use of the roller is far from this, the operation shall be performed under the temperature, humidity and other environment under the condition of use. If the experiment cannot be carried out properly, such as when the yarn cannot be cut to the above dimensions, cut it to a length that can be tested, and evaluate the above values in proportion to the length in the tension direction.

In the present invention, if a tubular knitted fabric made of elastic yarn is used as the fiber structure, the outermost peripheral surface of the roller has the shortest portion and the longest portion in the roller rotation center axis direction length of the fiber structure. Even if the difference in length, that is, the widening amount of the fibrous structure is increased, the torque required for rotation can be reduced. For this reason, in some cases, it is possible to rotate the rotating roller body only by the frictional force of the web running in contact with the roller. In this case, a large increase in cost and labor for large-scale equipment such as drive equipment is not required. This makes it possible to exhibit a greater effect.

[0036] In the present invention, since the fibrous structure is used on the roller surface, the degree of freedom in the type of yarn is high. Further, the use of the fibrous structure brings about an effect that, in addition to the effect of preventing scratches on the web, a change in friction coefficient due to aging can be reduced as compared with a conventional rubber rod. As a result, almost the same lengthening effect can be maintained for a long time.

[0037] In the web stretching roller of the present invention, a stretchable fiber structure is used as the web stretching means. The fibrous structure provides a web stretching action in the width direction of the web running in contact with the web. Since this stretching action is due to the fibrous structure, there is substantially no scratch on the force web, which is sufficient for stretching.

Brief Description of Drawings

FIG. 1 is a schematic perspective view of one embodiment of a web stretching roller of the present invention.

FIG. 2 is a flowchart for explaining a general plastic film manufacturing process.

[FIG. 3] FIG. 3 is a schematic cross-sectional view of a film winding device in a case where the roller for stretching in accordance with the present invention is used as a pressing roller.

[FIG. 4] FIG. 4 is a longitudinal sectional view of the roller for stretching the paper of the present invention shown in FIG. 1.

FIG. 5 is a cross-sectional view for explaining the relationship between the maximum widening position and the web embracing angle.

FIG. 6 is a plan view for explaining a method of evaluating elasticity in the length direction of a fiber structure.

FIG. 7 is a plan view for explaining a method for evaluating the elasticity of the fiber structure in the width direction.

FIG. 8 is a plan view for explaining a method for preparing a sample sheet for friction coefficient measurement.

[FIG. 9] FIG. 9 is a view for explaining a method of measuring a friction coefficient between a fiber structure and a roller shell. FIG.

FIG. 10 is a cross-sectional view for explaining a method of measuring a friction coefficient between a fiber structure and a web to be stretched.

FIG. 11 is a plan view of a sample piece used for an acceleration test that models expansion and contraction of a fiber structure.

Explanation of symbols

1 Roller for sheet extension

11 axes

12 Rotary roller body

13 Outer surface

14 Fiber structure

15 Telescopic means

21 Sheet forming die

22 Cooling drum

23 films

24 Stretching equipment

25 films

26a, 26b Transport rollers

27 Winding device

28 Huinolem Lonore (Web Lonole)

29 Pressure roller

30 Intermediate products

31 films

32a, 32b transport roll

33 Slitter

34 Winding device

35 Huinolem Lonore (Web Lonole)

36 Pressure roller Plastic film Huinolemuranore (Webrole)

Annular member

ball bearing

Polyester film (ゥ; r) Slant color

ball bearing

Inclined collar support member Maximum widening position

Maximum contraction position

Web

Sampno Receipt

a, 62b Both ends

a, 63b arrow

Arrow

Sample sheet

a, 72b Both ends

a, 73b arrow

Arrow

Sampno Receipt

a, 82b hole

a, 83b Fixed plate

Test piece

measuring device

Weight

Just a panel

1 Measuring device 103 Panel only

104 test pieces

BEST MODE FOR CARRYING OUT THE INVENTION

[0040] The present invention will be described in more detail using an embodiment of the present invention. Note that the present invention is not limited to this embodiment.

This embodiment relates to an apparatus for manufacturing a plastic film roll using a roller for stretching in accordance with the present invention, and will be described with reference to FIGS. 1 to 3.

FIG. 1 is a schematic perspective view of a roller for stretching the paper of the present invention. In FIG. 1, the roller 1 for stretching is composed of a rotating roller body 12 supported on a shaft 11, a fiber structure 14 covering an outer peripheral surface 13 of the rotating roller body 12, and a fiber roller 14 rotating the fiber structure 14. The center of rotation of the main body 12 comprises expansion / contraction means 15 for expanding / contracting in the axial direction. The rotating roller body 12 may be rotatably supported on the shaft 11, or may be fixed and supported on the shaft 11, and the shaft 11 may be a rotating shaft. In any case, in this embodiment, the central axis of the shaft 11 is the rotation central axis.

[0043] The outer peripheral surface 13 of the rotating roller body 12 and the fiber structure 14 are rotatably contacted at substantially the same speed. At the lower position 16 of the roller 1 shown in FIG. 1, the fibrous structure 14 is stretched by the stretching means 15, and at the upper position 17, the fibrous structure 14 is contracted by the stretching means 15. The fiber structure 14 is expanded and contracted in the direction of the central axis of rotation of the rotating roller body 12 by the expansion and contraction means 15, whereby tension in the width direction is applied to a web (not shown) that moves in contact with the fiber structure 14. Granted. As a result, the occurrence of a sheet on the web is prevented, or the sheet generated on the web is extended.

As the fibrous structure 14, a fabric having elasticity, such as a woven fabric, a knitted fabric, or a nonwoven fabric made of a natural fiber or a chemically synthesized fiber is used. Knitting such as flat knitting, rib knitting, and pearl knitting exhibits elasticity due to deformation of the stitch itself. Many woven fabrics and non-woven fabrics such as plain weave and twill weave have poor elasticity, but woven fabrics and non-woven fabrics made of elastic yarns or yarns containing the same have elasticity.

[0045] The fibrous structure 14 covers the outer peripheral surface 13 of the rotating roller main body 12, that is, the cylindrical structure. In this state, the roller 1 is formed. The tubular fiber structure 14 is formed by joining one side of one or a plurality of fabrics and their opposite sides by bonding, sewing, or the like. The tubular fiber structure 14 is covered by the rotating roller body 12 and the expansion / contraction means 15, and both ends of the fiber structure 14 are fixed to the left and right expansion / contraction means 15.

[0046] The seam portion of the fabric of the tubular fiber structure 14 may have an adverse effect on the web quality / stretching effect. In that case, it is preferable to use a seamless tubular fabric, that is, a seamless tubular fabric as the fibrous structure 14. As such a fiber structure, a seamless tubular knitted fabric is particularly preferable.

[0047] A knitted fabric having poor elasticity, such as polyamide, polyester, or acrylic, is used as the fibrous structure 14 because it has elasticity due to deformation of the stitch itself. However, elastic yarns or knitted fabrics containing yarn can be deformed significantly with a small force, and the amount of widening must be set larger without significantly increasing the torque required for rotation. Therefore, it is more preferably used as the fiber structure 14. Further, the knitted fabric has greater flexibility, and is therefore more preferably used as the fibrous structure 14.

[0048] As the 弹 ¾ yarn, for example, a polytrimethylene glycolone yarn or a polyurethane fiber is used. Among them, polyurethane fiber having excellent elongation and resilience is suitably used. Polyurethane fibers are preferably used in the form of a multilayered yarn such as a single covered yarn, a double covered yarn, and a core spun yarn, because they are vulnerable to wear. In particular, it is preferable that the cover yarn of the outermost layer is a yarn made of a material having good charge compatibility with the web to be produced (a material that is unlikely to generate triboelectric charging). Covered yarn in which polyurethane fiber is used for the core yarn and the cover yarn also has a material strength in which frictional electrification with the web is unlikely to be generated makes it possible to prevent defects of the web caused by electrostatic force S due to electrification. For example, if the web is a polyester film, it is preferable to use polyester yarn as the cover yarn.

[0049] The fineness of the fibers forming the fiber structure 14 is preferably 30 denier (33 dtex) to 450 denier (500 dtex). According to the findings of the present inventors, thin fibers are used. It is a component that increases the effect of preventing scratches on the web. However, the fibrous structure 14 using thin fibers has a problem in strength, such as easy tearing. In consideration of the strength, the fineness of the fibers forming the fiber structure 14 is more preferably 100 denier (111 decitex) to 250 denier (278 decitex)! When the above-described covered yarn is used, the core yarn may be 60 denier (66 dtex) to 200 denier (222 dtex), and the cover yarn strength may be 30 denier (33 dtex) to 100 denier (111 dtex). preferable. In this case, both the yarn strength and the effect of preventing the web from being damaged can be achieved.

[0050] In order to further enhance the stretching effect, the coefficient of static friction between the target web and the fibrous structure 14 is preferably higher. However, if the coefficient of static friction is too high, the web may be unnecessarily subjected to tension in the width direction, which may cause scratches on the web. Therefore, according to the findings of the present inventors, the static friction coefficient is more preferably 0.3 to 0.7!

[0051] The material of the outer peripheral surface 13 of the rotary roller body 12 is not particularly limited. For example, it may be metal, resin, or rubber. However, in order for the fiber structure 14 to expand and contract smoothly in the direction of the rotation center axis of the rotating roller body 12, it is preferable that the static friction coefficient between the fiber structure 14 and the outer peripheral surface 13 be low. Normally, if the static friction coefficient is 0.4 or less, the intended function can be achieved without any problem. It is preferable that the material and surface roughness of the outer peripheral surface 13 be selected so that the static friction coefficient falls within this range.

A sample sheet shown in FIG. 8 is used to measure the static friction coefficient between the fibrous structure 14 and the outer peripheral surface 13 of the roller, and the measurement is performed by a measuring device shown in FIG. The direction of the rotation center axis of the rotating roller body 12 of the fibrous structure 14 covering the outer peripheral surface 13 of the rotating roller body 12 is defined as the length direction of the fibrous structure 14. From the fibrous structure 14, a sample sheet with a length of 350 mm and a width of 50 mm 81 is cut and made. The length direction of the sample sheet 81 matches the length direction of the fibrous structure 14. Fixing plates 83a and 83b 1S having holes 82a and 82b for attaching weights and panel springs are attached to both ends in the length direction of the sample sheet 81, respectively. The fixing plates 83a and 83b are attached to the sample sheet 81 evenly in the width direction and without slipping, for example, by bolting. These fixed plates The sample sheet 81 to which 83a and 83b are attached is provided to a measuring device as a test piece 84 for measuring static friction coefficient.

[0053] Fig. 9 shows a measuring apparatus 91. The measuring device 91 includes a rotating roller body 12 supported so as not to rotate, a weight 92, and a panel 93. In the measurement of the coefficient of static friction, a test piece 84 is wound around the outer peripheral surface 13 of the rotating roller body 12 which is supported so as not to rotate over a circumferential direction of 180 °. A weight 92 is attached to a hole 82b of one fixing plate 83b of the test piece 84. The weight of the weight 92 is selected so that the sum of the weight of the fixing plate 83b and the weight of the weight 92 becomes 100g. A panel force 93 is attached to the hole 82a of the other fixing plate 83a of the test piece 84.

[0054] The measurement is performed by moving the panel force 93 downward while grasping the lower portion of the panel force 93 slowly enough that the speed does not affect the result, as indicated by the arrow 94. Load force when test piece 84 begins to move. The coefficient of static friction is calculated by the following equation (i).

[0055] μ = 1η (Τ2 / Τ1) / (i)

Here, is the coefficient of static friction, T1 is the tension generated by the weight 92 (here, 100 gf (0.98N)), T2 is the load measured by the panel force 93, φ is the winding angle of the test piece 84 ( Here, 7u rad), In represents the natural logarithm. Note that the measurement is performed at five locations except for both ends in the direction of the rotation center axis of the rotating roll main body 12 for every six divided lengths of the outer peripheral surface of the rotating roll main body 12. Load T2 is the average value of the loads obtained by each measurement.

[0056] The coefficient of static friction between the fibrous structure 14 and the web in a state where the fibrous structure 14 is mounted on the rotating roller body 12 is measured, and the static friction between the fibrous structure 14 and the outer peripheral surface 13 of the rotating roller body 12 is measured. It is performed in a manner similar to the measurement of the coefficient of friction. A test piece 104 similar to the test piece 84 of FIG. 8 is produced from the web that comes into contact with the fiber structure 14 in the web transporting step, instead of the sample sheet 81 having the fibrous structure 14 in the test piece 84.

[0057] The measuring device 101 is shown in FIG. The measuring device 101 is composed of a rotating roller body 12 supported so as not to rotate, a fiber structure 14 mounted to cover the outer peripheral surface 13 of the rotating roller body 12, a weight 102, and a panel force 103. Become. The fibrous structure 14 is shown in FIG. In this case, the rotary roller main body 12 is mounted so that the maximum widening position is located vertically above the rotary roller main body 12.

The measurement is performed by a test piece 104 wound around the fibrous structure 14 in FIG. The winding angle of the test piece 104 around the fiber structure 14 and the subsequent measurement procedure are the same as the winding angle and the measurement procedure described above with reference to FIG. When the web to be used is not clear, a polyester film having a thickness of 30 m is used. Specifically, a polyester film “Lumirror” S10 type manufactured by Toray Industries, Inc. having a thickness of 30 μm is used.

In the above description of the measurement of the coefficient of static friction, a sample sheet 81 having a length of 350 mm was used as shown in FIG. 8, but when the diameter of the rotating roll body 12 exceeds 150 mm. For example, when the measurement is difficult with this length, the length may be appropriately changed. Further, when the weight of the sample sheet 81 is relatively heavy, the weight of the weight 92 may be corrected to such an extent that its influence can be ignored. In principle, the measurement of the coefficient of static friction is performed in air at a temperature of 25 ° C and a relative humidity of 40%. However, if it is clear that the use state of the rotating roller body 12 in the process is far from this, the measurement of the coefficient of static friction is performed under the temperature, humidity, and other environment in the use state of the rotating roller body 12. It is.

The expansion / contraction means 15 does not exert any force as long as it can expand and contract the fiber structure 14 in the direction of the rotation center axis of the rotary roller body 12. For example, a plurality of actuators are arranged on a circumferential orbit, and the actuators hold both ends of the fiber structure 14 and rotate the fiber structure 14 in the direction of the rotation center axis of the rotating roller body 12 while rotating in synchronization with the web transport speed. It is also possible to use an expanding / contracting means having a mechanical force for expanding / contracting. In addition, an expansion / contraction means having an inclined collar force rotatable with respect to a rotation axis inclined with respect to the rotation center axis disposed on both outer sides in the rotation center axis direction may be used. The inclined collar system is preferably used as the expansion and contraction means because of its simple structure, small power that requires no power, and easy synchronization of rotation.

[0061] It is preferable that the setting of the tilt angle of the tilt collar can be arbitrarily changed. With this configuration, the inclination can be adjusted according to the thickness, width and tension of the web to be stretched. The angle can be changed, and the stretching effect can be adjusted appropriately.

[0062] In the present invention, a fibrous structure 14 that contacts the web is used. Since the surface of the fibrous structure 14 has elasticity, the contact with the web is soft, and when foreign matter is present during the process, the foreign matter is prevented from being strongly pressed against the web, and the surface of the web is prevented. Hardly damages The fibrous structure 14 is lighter than the other means, and can be easily selected so as to have appropriate friction against the web. In this case, the torque required for the rotation is small, and a speed difference from the web is hardly generated, so that the web surface is hardly damaged by the slip. The fibrous structure 14 generally has air permeability. Therefore, even if air enters between the web such as a plastic film and the roller, it is easy to escape without staying as it is. Therefore, high adhesion between the web and the fibrous structure 14 can be maintained, and uniform and appropriate friction can be stably maintained between the two. Due to such characteristics, when the web stretching roller of the present invention is used as the transport roller used in the winding step for producing a plastic film, the transport roller is provided with a preceding force to release air. May not be necessary.

FIG. 5 is a cross-sectional view for explaining the relationship between the maximum widening position of the fiber structure 14 in the roller 1 and the angle of embedment of the web 53 to the fiber structure 14. In FIG. 5, the maximum widening position 51 is a position in the rotation direction in which the fiber structure 14 is maximally extended by the expansion / contraction means 15, and the maximum contraction position 52 is a rotation direction in which the fiber structure 14 is maximally contracted by the expansion / contraction means 15. At the position. The hugging angle Θ of the web 53 is preferably 30 ° or more. In order to achieve a higher stretching effect, the hugging angle 120 is more preferably 120 ° or more and the widening angle β or less. Here, the widening angle β is an angle formed by the rotation center axis, the maximum widening position 51, and the maximum contraction position 52 on a plane orthogonal to the rotation axis. In a method in which an inclined collar is used for the expansion and contraction means 15, the widening angle β is usually 180 °, and in a method in which an actuator is used in the expansion and contraction means 15, the expansion angle β is usually an arbitrary angle. I can do it. The attachment angle OC is an angle formed by the rotation center axis, the maximum widening position 51, and the point at which the web 53 separates from the fiber structure 14 in a plane orthogonal to the rotation center axis. In order to prevent the widened web 53 from shrinking, the attachment angle α is preferably 0 ° or more, but 45 ° or more. If so, there are many practical problems!

[0064] The web stretching roller of the present invention has a high effect of preventing the occurrence of scratches in the web, and is therefore preferably used in an apparatus for producing webs with strict quality requirements regarding scratches, for example, plastic films for optical applications.

FIG. 2 is a schematic view of a general plastic film manufacturing process. The molten polymer of the thermoplastic resin is continuously extruded from the sheet forming die 21 into a sheet. The extruded molten sheet comes into contact with the cooling drum 22 and is cooled to be a solidified film 23. The film ²³ is continuously introduced into the stretching device 24. The film ²³ is stretched in the stretching device 24 in the longitudinal direction and the width direction. The stretched film 25 is conveyed to the winding device 27 by the conveying rollers 26a and 26b, where the film 25 is wound into a roll. The film wound into a roll forms a film roll (web roll) 28. The winding device 27 is provided with a rotary pressure roller 29 that contacts the film roll 28 being formed with a predetermined pressure in order to improve the formation of the film roll 28.

[0066] The manufactured film roll 28 may be shipped as a product in that state. When the width of the manufactured film roll 28 is long, it is usually supplied to the slitting process as an intermediate product 30. Is done.

In the slitting step, the film 31 continuously drawn from the intermediate product 30 is conveyed by the conveying openings 32a and 32b to reach the slitter 33. At the jitter 33, the finolem 31 is slit into a predetermined width to form a plurality of films. Each of the plurality of films is wound by a respective winding device 34 to form a film roll (web roll) 35 as a final product. The winding device 34 is provided with a rotary contact pressure roller 36 that contacts the film roll 35 being formed with a predetermined pressure in order to improve the formation of the film roll 35.

[0068] As the transport rolls 26a, 26b, 32a, and 32b in the film roll manufacturing process shown in Fig. 2, a roller for stretching the web of the present invention is used as necessary. Further, as the rotating contact pressure rollers 29 and 36, the roller for stretching the web of the present invention is used as necessary.

[0069] The film roll 28 or the film roll 35 was decompressed by a vacuum evaporation device or the like. In some cases, the atmosphere is supplied to a step that undergoes a predetermined process. In this step, the film is drawn by the film rolls 28 and 35, conveyed by a conveyance roll, subjected to a predetermined process, and then wound up. In this step, the film may need to be stretched. In this process, for example, when a conventional sheet stretching means such as a bending-type expander roller force is applied, the effect of the accompanying airflow entering between the roller surface and the film is much more than that in the atmosphere. Become smaller. In this case, the coefficient of friction between the roller and the film increases. In order to prevent the occurrence of film scratches caused by the increase in the coefficient of friction, it is necessary to precisely adjust the rotation speed of the roll. In addition, the film is susceptible to damage because excessive tension develops in the width direction of the film immediately.

[0070] On the other hand, when the web stretching roller of the present invention is used as a web stretching means in the step of being placed in a reduced-pressure atmosphere, the stretch / flexibility of the fiber structure is A slight speed difference is absorbed and a relative speed difference is less likely to occur.Moreover, since the excessive tension generated in the width direction of the film is absorbed by the minute deformation of the fibrous structure, as in the above-described conventional sheet stretching means. No problem! / ,.

FIG. 3 is a cross-sectional view of a film winding device using the web stretching roller of the present invention as a pressure roller. When the conveyed plastic film 37 is taken up as a film roll (web roll) 38 in a roll form, it is composed of a rotating roller body 12, a fiber structure 14 covering the outer peripheral surface 13 of the rotating roller body 12, and expansion / contraction means 15. The web stretching roller 1 of the present invention is pressed against the film roll 38 to form the film roll 38.

In the manufacturing process of the plastic film shown in FIG. 2, the winding device 27 is provided with a pressing roller 29 or a pressing roller 36 on the winding device 34. In the film winding device for winding the films 25 and 31 while applying the contact pressure to the film rolls 28 and 35 by the pressing rollers 29 and 36, a web stretching opening of the present invention shown in FIG. By using rollers for the pressure rollers 29 and 36, the free path length in which the stretched film travels without being gripped can be shortened. For this reason, the stretched film re-sags, thereby preventing the film from re-sealing. Example 1

A web stretching roller 1 of the present invention shown in FIG. 1 was produced. The detailed structure is shown in FIG. FIG. 4 is a longitudinal sectional view of an example of the roller 1 of the present invention.

The rotating roller body 12 includes a roller shell 41 made of carbon fiber reinforced plastic having a length of lm and an outer diameter of 80 mm, an annular member 42 supporting shells 41 attached to both inner ends of the shell 41, and an annular member 42. And a metal fixed shaft 11 to which the ball bearing 43 is attached. The surface of the roller shell 41 is coated with a urethane resin-based paint from the viewpoint of preventing contamination and improving lubricity.

[0075] Elastic yarn of single-covered yarn using 70 denier (78 decitex) polyurethane yarn as the core yarn and 75 denier (83 decitetus) polyester yarn as the cover yarn ("LYCRA" manufactured by Opeguchi Ntex Co., Ltd.) Using SCY S775D), a seamless circular knitting machine knitted in a tubular shape was created. The knitting structure adopted rib knitting. Unit area per Rino weight of circular knitting greige was a 125gZm ^2. The circular knitting machine was heat-treated in hot water of 100 ° C for 30 minutes to further enhance the elasticity. The circular knitting machine thus manufactured (hereinafter referred to as the circular knitting machine of Example 1) was used as the fiber structure 14. The fiber structure 14 was attached to the outer peripheral surface 13 of the roller shell 41 while pulling both ends thereof and applying a tension of 150N.

In order to measure the lengthwise elasticity of the fibrous structure 14, three sample sheets having a length of 120 mm and a width of 100 mm were cut from the heat-treated circular knitting machine. The plan view force of the sample sheet 61 is shown in FIG. The sample sheet 61 is gripped with a vice at both ends 62a and 62b in the direction along the width, and tension is applied in the directions indicated by arrows 63a and 63b, and the above-described lengthwise direction (direction indicated by arrow 64) is applied. Was evaluated for elasticity. With respect to all the sample sheets 61, the dimensions after releasing the tension were restored to 102 mm to 104 mm, and it was confirmed that they had elasticity.

[0077] In order to measure the elasticity in the width direction of the fibrous structure 14, three sample sheets of 80 mm in length and 100 mm in width were cut from the heat-treated circular knitting machine. The plan view force of the sample sheet 71 is shown in FIG. The sample sheet 71 is gripped with a vice at both ends 72a and 72b in the direction along the length, and tension is applied in the directions indicated by arrows 73a and 73b. , And the aforementioned elasticity was evaluated in the width direction (the direction indicated by the arrow 74). In this evaluation test, the sample sheet 71 placed horizontally was gripped uniformly with a vise over the entire width with two sides in the length direction spaced 80 mm in the width direction, and indicated by arrows 73a and 73b. After applying tension in the width direction and elongating to 88 mm, when shrinking at the speed of ImmZ seconds, the length of each sample was measured for three sample sheets 71 prepared one by one. Was evaluated. For all the sample sheets 71, the dimensions after releasing the tension were restored to 82 mm to 84 mm, and it was confirmed that they had elasticity.

[0078] The coefficient of static friction between the fiber structure 14 and the surface of the roller shell 41 and the coefficient of static friction between the fiber structure 14 and the polyester film (web) 44 are as described above. The measurement was performed by the method described with reference to FIGS. Three sample sheets were prepared by cutting a 3 μm-thick polyester film “Lumirror” C21 type, manufactured by Toray Industries, Inc., for measuring the static friction coefficient of both. The coefficient of static friction between the fibrous structure 14 and the surface of the roller shell 41 was measured on three sample sheets, and was found to be 0.15 to 0.24. The results of measuring the coefficient of friction between the fibrous structure 14 and the polyester film 44 for the three sample sheets were 0.43 to 0.52. It was confirmed that these values were within the above-mentioned preferred values.

[0079] The expansion / contraction means 15 includes an annular inclined collar 45 having a rotation center axis inclined with respect to the rotation center axis of the rotating roller body 12, a ball bearing 46 mounted inside the inclination collar 45, A ball bearing 46 is attached to the outer circumference, and the inner circumference is composed of an inclined collar support member 47 fixed to the shaft 11. The inclined collar 45 is attached to the shaft 11 via a ball bearing 46 and an inclined collar support member 47 with a clearance of 25 mm from the end of the rotating roller body 12 on the outer side in the rotation center axis direction of the rotating roller body 12. Have been. The clearance is the distance between the position of the inclined collar 45 closest to the end of the roller shell 41 and the end of the roller shell 41.

[0080] Both ends of the fiber structure 14 covered by the rotating roller body 12 are gripped by left and right inclined collars 45, respectively. The tilt angle of the rotation center axis of the tilt collar 45 with respect to the rotation center axis of the rotary roller body 12 (hereinafter, referred to as the tilt angle of the tilt collar) has a structure that can be adjusted stepwise. In the present embodiment, the inclination angle of the inclination collar is 15 °. And

[0081] The web stretching roller 1 formed here is used as a web stretching roller (FIG. 1) provided immediately before the pressing roller 36 of the winding device 34 in the slitting process of the biaxially stretched polyester film. (Not shown). The roller 1 used was a type in which the shaft 11 was not driven to rotate, that is, a free roller type.

[0082] When the biaxially stretched polyester film 31 is conveyed in contact with the fibrous structure 14, the fibrous structure 14, the inclined collar 45, and the rotating roller body 12 (roller shell 41) 1S are substantially synchronized. To rotate. By this rotation, the fibrous structure 14 expands and contracts in the direction of the rotation center axis of the rotating roller body 12. Due to this expansion and contraction, tension in the width direction is applied to the polyester film 31. The film pass line was configured so that the embracing angle of the film 31 was 140 °, the mounting angle oc was 0 °, and the widening angle β was 180 °.

Using the slitting process configured as described above, a winding test of a biaxially stretched polyester film (polyester film “Lumirror” C21 type manufactured by Toray Industries, Inc.) having a thickness of 3 μm and a width of 600 mm was performed. did.

[0084] In the test method, a tape having a thickness of 0.2 mm was attached to the transport rollers 32a and 32b in the slitting process, and a step was locally formed to generate a shear on the film 31 and a winding tension of 30NZm. The web was wound at a winding speed of 200 mZmin, and the mixing of the screen into the film roll 35 before and after the application of the web stretching roller of the present invention was compared.

[0085] As a result of the test, in the case where the paper-stretching roller is not used, the force generated by the transport rollers 32a and 32b to be wound directly onto the film roll 35 is used as the wrinkle-stretching roller of this embodiment. In this case, it was confirmed that the film roll 35 was formed in a state where the shear generated by the transport rollers 32a and 32b was removed. It was also confirmed that the film of the film roll 35 had no scratches.

Example 2

[0086] In the same manner as in Example 1, the roller 1 for stretching a web of the present invention shown in Fig. 1 was produced. The detailed structure is the same as in Example 1, and is as shown in FIG.

In the same coating of the surface of the roller shell 41 as in Example 1, abrasion of the coating film was confirmed at both end portions of the roller shell 41 sliding with the fibrous structure 14 over a long period of use. Therefore, in the present embodiment, the surface coating of the roller shell 41 was changed to a node chrome plating. The hard chrome plating has a higher abrasion resistance than the coating of Example 1 and can maintain the contamination prevention effect and the lubricity for a longer period of time.

[0087] Elastic yarn of single-covered yarn using polyurethane yarn of 140 denier (156 dtex) as the core yarn and polyester yarn of 75 denier (83 dtex) as the cover yarn ("LYCRA" manufactured by Operontex Co., Ltd.) Using SCY S1475D), a seamless circular knitting machine knitted in a tubular shape was created. The knitting structure adopted rib knitting. Weight per unit area of the circular knitting greige was a 130gZm ^2. In order to further increase the elasticity, the circular knitting machine was heat-treated in hot water at 100 ° C for 30 minutes. The circular knitting machine thus manufactured (hereinafter, referred to as a circular knitting machine of Example 2) was used as the fiber structure 14. The fiber structure 14 was attached to the outer peripheral surface 13 of the roller shell 41 while pulling both ends of the fiber structure 14 and applying a tension of 210 N.

[0088] In the circular knitting machine of Example 2, in the acceleration test in which the expansion and contraction of the fiber structure attached to the roller was modeled, the number of times of repeated expansion and contraction until the fiber was broken was smaller than that of the greige machine of Example 1. It was about 4 times. That is, the number of repetitions until one break point of the fiber was confirmed. The circular knitting machine of Example 1 was about 15,000 times, while the circular knitting machine of Example 2 was about 60,000 times. , 000 times. This means that the circular knitting machine of the second embodiment has a longer service life than the circular knitting machine of the first embodiment.

[0089] This acceleration test was performed by the following method. With the length direction of the circular knitting machine as the length direction and the circumferential direction as the width direction, cut out a sample piece with a width of 20 mm and a length of 70 mm without tension. Next, as shown in FIG. 11, a range of squares 112a and 112b of 10 mm in both ends in the length direction and 10 mm in the center in the width direction of the sample piece 111 is gripped tightly, and one side of the sample piece 111 is gripped. Was fixed, and the other side end of the sample piece 111 was reciprocated at a frequency of 10 Hz. The stroke range of the vibration was set so that the distance between the fixed portions at both ends was 50 mm to 19 Omm. That is, it was expanded and contracted in the range of 1 to 3.8 times the natural length of tension 0. The fibrous structure 14 mounted on the web stretching roller 1 of the present embodiment expands and contracts in a range of 2.0 times to 2.3 times.

[0090] The web stretching roller 1 formed here is provided with a web stretching provided immediately before the pressing roller 36 of the winding device 34 in the slitting process of the biaxially stretched polyester film. Roller (not shown). The roller 1 used was a type in which the shaft 11 was not driven to rotate, that is, a free roller type. The film pass line was configured so that the hugging angle of the film 31 was 140 °, the mounting angle a was 0 °, and the widening angle j8 was 180 °. The inclination angle of the inclination collar 45 was set to 15 °.

[0091] Using the slitting process configured as described above, a winding test of a biaxially stretched polyester film (C21 type, polyester film "Lumirror", manufactured by Toray Industries, Inc.) having a thickness of 3 µm and a width of 600 mm was performed. The operation was performed in the same manner as in Example 1.

[0092] As a result of the test, when the sheet stretching roller was not used, the force generated by the transport rollers 32a and 32b so that the sheet could be wound directly on the film roll 35 was used. In this case, it was confirmed that the film roll 35 was formed in a state where the shear generated by the transport rollers 32a and 32b was removed. It was also confirmed that the film of the film roll 35 had no scratches.

Example 3

[0093] The web stretching roller 1 having the same configuration as that of the first embodiment is provided with a web stretching roller provided immediately before the pressing roller 36 of the winding device 34 in the slitting process of the biaxially stretched polypropylene film. (Not shown). The roller 1 used was a type in which the shaft 11 was not driven to rotate, that is, a free roller type. The film pass line was configured so that the hugging angle of the film 31 was 1S 140 °, the mounting angle α was 0 °, and the widening angle j8 was 180 °. The inclination angle of the inclination collar 45 was 8 °.

[0094] A winding test of a biaxially stretched polypropylene film having a thickness of 3 µm and a width of 600 mm (Toray Co., Ltd. polypropylene film "Trefane # 2172 type") using the slit process configured as described above. Was carried out in the same manner as in Example 1.

[0095] As a result of the test, when the sheet stretching roller is not used, the force generated by the transport rollers 32a and 32b to be wound directly on the film roll 35 is used as the sheet stretching roller of this embodiment. In this case, it was confirmed that the film roll 35 was formed in a state where the shear generated by the transport rollers 32a and 32b was removed. It was also confirmed that the film of the film roll 35 had no scratches.

Example 4 [0096] In the same manner as in Example 1, the roller 1 for stretching a web of the present invention shown in Fig. 1 was produced. The detailed structure is the same as that of the first embodiment, and is as shown in FIG. The rotating roller body 12 includes a roller shell 41 made of carbon fiber reinforced plastic having a length of 2,800 mm and an outer diameter of 110 mm, an annular member 42 for supporting shells 41 attached to both inner ends of the shell 41, and an annular member 42. The ball bearing 43 mounted inside the inside and the metal fixed shaft 11 to which the ball bearing 43 is mounted also have a force. The surface of the roller shell 41 was subjected to hard chrome plating from the viewpoints of improving the wear resistance and the lubricity of the surface and preventing contamination.

[0097] The fibrous structure 14 was the one used in Example 1. Both ends of the fibrous structure 14 were pulled with a tension of 150 N and attached to the outer peripheral surface 13 of the roller shell 41.

[0098] As the expansion / contraction means 15, the same inclined collar 45 as in Example 1 was used. The inclined collar 45 is attached to the shaft 11 via a ball bearing 46 and an inclined collar support member 47, with a clearance of 25 mm from the end of the rotating roller body 12 outside the rotation center axis direction of the rotating roller body 12. Have been. The clearance is the distance between the position of the inclined collar 45 closest to the end of the roller shell 41 and the end of the roller shell 41.

[0099] Both end portions of the fibrous structure 14 covered by the rotary roller body 12 are gripped by left and right inclined collars 45, respectively. The tilt angle of the rotation center axis of the tilt collar 45 with respect to the rotation center axis of the rotary roller body 12 (hereinafter, referred to as the tilt angle of the tilt collar) has a structure that can be adjusted stepwise. In the present embodiment, the inclination angle of the inclination collar is set to 15 °.

[0100] In the web stretching roller 1 configured as described above, the displacement force of the fibrous structure 14 provided by the elastic means 15 at both ends does not reach the entire fibrous structure 14, but the fibrous structure Although it expands and contracts only in the range of about 700 mm at both ends of 14, the results of the experiment confirm that there is also an effect of stretching the center. That is, it has been found that the desired web stretching effect can be obtained if the web can be sufficiently stretched at both ends without expanding and contracting the central portion.

[0101] The web stretching roller 1 configured as described above is provided with a web stretching roller (just before the pressing roller 29 of the winding device 27 in the biaxially stretched polyester film manufacturing apparatus). (Not shown). The roller 1 used was a type in which the shaft 11 was not driven to rotate, that is, a free roller type.

[0102] When the biaxially stretched polyester film 25 is conveyed in contact with the fiber structure 14, the fiber structure 14, the inclined collar 45, and the rotating roller body 12 (roller shell 41) 1S are substantially synchronized. To rotate. By this rotation, the fibrous structure 14 expands and contracts in the direction of the rotation center axis of the rotating roller body 12. Due to the expansion and contraction, tension in the width direction is applied to the biaxially stretched polyester film 25. The film nosline was constructed so that the hugging angle of the film 25 was 120 °, the mounting angle a was 0 °, and the widening angle β was 180 °.

[0103] A biaxially stretched polyester film having a thickness of 3 µm and a width of 2,400 mm (a polyester film "Lumirror" C10 type manufactured by Toray Industries, Inc.) was formed by using the film winding process thus configured. Was carried out a winding test. As winding conditions, a winding tension of 30 NZm and a winding speed of 200 mZmin were adopted.

In the case where the roller 1 for stretching in the present example was not used, about 30% of the film rolls 28 were rejected due to the occurrence of shear. In the case where the roller for stretching the paper of this example was used, the rejection rate due to the shear was 0%. It was also confirmed that the film of the film roll 28 was not scratched.

Industrial applicability

In the web stretching roller of the present invention, a stretchable fiber structure is used as the web stretching means. The fibrous structure provides a web stretching action in the width direction of the web running in contact with the web. Since this stretching action is due to the fibrous structure, there is substantially no scratch on the force web, which is sufficient for stretching. For this reason, the web stretching roller of the present invention is preferably used as a web stretching roller in a plastic film manufacturing process. In particular, it is most suitable as a sheet stretching roller used in the process of producing a web that is resistant to scratches, for example, a plastic film for optical use.

Claims

The scope of the claims

[1] A rotating roller main body, a stretchable fiber structure covering the outer peripheral surface of the rotating roller body, and an expansion / contraction means for expanding and contracting the fiber structure in a rotation center axis direction of the rotating roller body. Roller for web stretching.

2. The web stretching roller according to claim 1, wherein the fibrous structure is a tubular fabric.

[3] The web stretching roller according to claim 2, wherein the tubular fabric is seamless.

4. The web stretching roller according to claim 2, wherein the tubular fabric is an elastic yarn or a yarn containing the elastic yarn.

5. The web stretching roller according to claim 2, wherein the tubular fabric is a knitted fabric.

[6] The web stretching roller according to claim 5, wherein the knitted fabric is an elastic yarn or a yarn containing the elastic yarn.

[7] The roller for stretching a web according to claim 5, wherein the knitting is seamless.

[8] The expansion / contraction means is disposed on both outer sides in the rotation center axis direction of the rotary roller body, and has a tilt collar force rotatable about a rotation center axis tilted with respect to the rotation center axis. 2. The web stretcher according to claim 1, wherein an end of the fiber structure is gripped, and an outer package surrounding the rotary roller body is formed by the fiber structure and the inclined collar. roller.

[9] The coefficient of static friction between the fibrous structure and the web is 0.3 to 0.7, and the coefficient of static friction between the fibrous structure and the rotating roller body is 0.3. The roller for stretching a web according to claim 8, wherein the roller is 4 or less.

[10] A web supply device that continuously supplies the web, a web transport device that transports webs continuously supplied from the supply device, and a web that continuously transports the web continuously transported by the transport device 2. A web roll manufacturing apparatus comprising: a web take-up device configured to wind a web in a form; ウェブ A web roll manufacturing apparatus provided with a stretching roller.

[11] The apparatus for manufacturing a web roll according to claim 10, wherein the web stretching roller force is arranged so as to be able to press against a surface of a web roll formed in the web winding device. .

[12] Continuously supplying the tube, the tube supply process, the tube continuously supplied from the supply process, the tube continuously transported, and the tube continuously transported in the transport process. A method for manufacturing a web roll, comprising: a web winding step of continuously winding a web into a roll form, wherein the web is stretched at least at one point in the web transporting step according to claim 1. Of manufacturing a web roll provided with a roller for use.

13. The method for producing a web roll according to claim 12, wherein the web is a polyester film.