KR20170000769A - Web manufacturing method and web - Google Patents

Abstract

It is an objective of the present invention to provide a web manufacturing method which stably conveys webs even when knurling is performed via double pressing, and can thus produce webs of good quality, and a web manufactured thereby. To this end, the present invention is characterized in that: a web having a thickness of 45 m or less is supported on the front side and backside by a first roll (31) and a second roll (32) having multiple protrusions thereon; a process for knurling both ends of the web in the width direction is included; and when the web is supported by the first roll (31) and the second roll (32), the protrusions of the first roll (31) and the protrusions of the second roll (32) are coupled with each other at an angle of 1 to 89, inclusively.

Description

Web manufacturing method, and WEB MANUFACTURING METHOD AND WEB}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a web manufacturing method and web, and more particularly, to a web manufacturing method and a web which provide concave and convex portions at both ends in the width direction of the web.

BACKGROUND ART [0002] Techniques for imparting unevenness (knurling) to both ends in the width direction of a film as countermeasures for slip and winding deviation of a web, for example, a film are known. As a method for imparting nulling, a method of holding one or both sides with a pair of rolls which are processed by embossing is generally performed. Single pressing is used when a boss processed roll is used on only one side, and double pressing is used when a boss processing roll is used on both sides.

As a technology for imparting nulling, for example, in the following Patent Document 1, there is described an acrylic film on which a knurling process is performed on a side end portion of a film.

Japanese Patent Application Laid-Open No. 2007-91784

When knurling is applied, single pressing can provide knurling relatively stably, but since knurling deformation is hardly imparted to the film, additional facilities such as heating, driving, and high-pressing pressure equipment are required . In addition, double pressing is more likely to impart knurling deformation than single pressing, and nulling can be provided with a simple and inexpensive apparatus. However, in the case of a film that is susceptible to deformation such as a thin film having a thin film thickness, in the double pressing, since a force is applied in a direction different from the carrying direction by the pair of rolls for imparting knurling, Curling occurs, meandering and disengagement tend to occur, and it has been difficult to produce a film of good quality.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide a web manufacturing method for producing a web of good quality by carrying a web stably even when knurling is applied to a thin web by double pressing, And to provide the above objects.

In order to attain the above object, the present invention provides a method of sandwiching (sandwiched) a web from a front side and a back side of a web having a thickness of 45 μm or less with a first roll and a second roll having a plurality of convex portions, Wherein the engaging angle between the convex portion of the first roll and the convex portion of the second roll when sandwiched between the first roll and the second roll is 1 DEG or more and 89 DEG or less.

According to the present invention, in the step of knurling both ends in the width direction of the web from the front side and the back side of the web, the convex portion of the first roll for imparting knurling and the convex portion of the second roll By setting the angle to be not less than 1 DEG and not more than 89 DEG, it is possible to apply a force toward the outside of the web when sandwiched between the first roll and the second roll. Therefore, since the web does not face toward the inner side, it is possible to prevent occurrence of curling and wrinkling due to the disengagement of the web, deflection, and the like. In addition, when a force is applied inward with respect to the conveying direction of the web, wrinkles occur or an engagement release occurs due to the movement of the end side of the web toward the inside.

In the present specification, the term " engagement angle " is defined as " the center of the deformation portion of the web by the protrusion of the first roll and the protrusion of the second roll closest to the deformation portion of the web by the protrusion of the first roll &Quot; refers to an angle formed by a straight line in the direction toward the outside of the web from the straight line connecting the center of the deformation portion of the web and the conveying direction of the web. The engagement angle is the same as the number of deformation caused by the convex portion, but the angle of engagement of the deformation of the web by the convex portion excluding the portion where the convex deformation is intentionally made irregular at both ends, 1000 mm.

In another aspect of the present invention, it is preferable that the web is a resin film.

In another aspect of the present invention, it is preferable that the engagement angle is not less than 10 degrees and not more than 80 degrees.

In another aspect of the present invention, it is preferable that the engagement angle is not less than 30 degrees and not more than 60 degrees.

This embodiment further defines the limitation of the web and the angle of engagement, and the engagement angle is preferably not less than 10 degrees and not more than 80 degrees, more preferably not less than 30 degrees and not more than 60 degrees.

In order to attain the above object, the present invention provides a knurl apparatus comprising a knurl unit provided on a web, sandwiched between a first roll and a second roll having a plurality of convex portions from a front surface side and a back surface side of both widthwise ends of a web having a thickness of 45 탆 or less, And a web having an engagement angle of 1 DEG or more and 89 DEG or less.

According to the present invention, since the engaging angle of the knurling imparted to the web by the first roll and the second roll from the front side and the back side of both ends in the width direction of the web is set to 1 DEG or more and 89 DEG or less, It is possible to prevent occurrence of wrinkles and curling at the time of manufacturing, and it is possible to provide a web of good quality.

In another aspect of the present invention, it is preferable that the web is a resin film.

In another aspect of the present invention, it is preferable that the engagement angle is not less than 10 degrees and not more than 80 degrees.

In another aspect of the present invention, it is preferable that the engagement angle is not less than 30 degrees and not more than 60 degrees.

This embodiment further defines the limitation of the web and the angle of engagement, and the engagement angle is preferably not less than 10 degrees and not more than 80 degrees, more preferably not less than 30 degrees and not more than 60 degrees.

According to the web manufacturing method of the present invention, by making the engaging angle of the pair of first rolls and the second rolls imparting knurling to be equal to or greater than 1 DEG and equal to or less than 89 DEG, the engagement of the first roll and the second roll, As shown in FIG. Therefore, it is possible to prevent the generation of wrinkles and curling in the conveyance of the web, to prevent the release of the engagement, to stably transport the web, and to produce a film of good quality.

1 is an explanatory view showing an outline of a film production apparatus;
2 is a plan view showing an outline of a nulling device.
3 is a cross-sectional view taken along line III-III of the knurling imparting device.
4 is an enlarged view of the circumferential surface of the first roll;
Fig. 5 is an explanatory view showing a form in which nulling is imparted to a polymer film by a pair of nulling rolls; Fig.
6 is a cross-sectional view showing an outline of nulling;
7 is an explanatory view showing an outline of nulling according to an engagement angle of a pair of nulling rolls;

Hereinafter, a web manufacturing method and a web according to the present invention will be described with reference to the accompanying drawings. In the present specification, " " is used to mean that the numerical values described before and after the lower limit and the upper limit are included.

Hereinafter, a method for producing a resin film (polymer film, for example, TAC (triacetylcellulose) film) is described as an example of a web manufacturing method, but the present invention is not limited to a resin film but can be applied to various webs.

[Film Production Equipment]

Fig. 1 is an explanatory diagram showing an outline of a film production facility, Fig. 2 is a plan view showing an overview of a nulling imparting apparatus, and Fig. 3 is a sectional view taken along a line III-III of the nulling imparting apparatus in Fig. The film manufacturing apparatus 10 includes a film production apparatus 12 for producing a strip-shaped polymer film 11 and a winding apparatus (for example, a winding apparatus) for forming a film roll 13 formed by winding a polymer film 11 14).

Between the film producing device 12 and the winding device 14, a conveying path for the polymer film 11 is provided. In the transport path of the polymer film 11, the polymer film 11 is transported in the longitudinal direction of the polymer film 11 (hereinafter referred to as A direction). In the conveying path of the polymer film 11, a nulling device 15 is provided. A knurling is given to both end portions (ear portions) in the width direction of the polymer film 11 with the nulling imparting device 15.

The winding device 14 has a columnar core 21 wound around the polymer film 11 fed from the knurling imparting device 15. The winding device 14 includes a guide roller 22 guiding the polymer film 11 fed from the knurling imparting device 15 to the winding core 21 and a polymer film 11 guided by the guide roller 22 11) in the direction of the core (21).

1 and 2, the nulling imparting device 15 includes a pair of nulling rolls 26 for nipping the polymer film 11 conveyed in the direction A, a pair of nulling rolls 26, And a shift portion 27 for adjusting the pressing force of the pressing portion.

The nulling roll pairs 26 are arranged on both sides of the width direction of the polymer film 11 (hereinafter referred to as the B direction). 3, the nulling roll pair 26 has a cylindrical first roll 31 and a cylindrical second roll 32 spaced apart from the first roll 31. As shown in Fig. The first roll 31 is attached to the first rotating shaft 31x and the second roll 32 is attached to the second rotating shaft 32x. The first roll 31 faces the second roll 32 with the transport path of the polymer film 11 interposed therebetween. The first roll 31 is disposed on the first surface 11h side of the polymer film 11. The second roll 32 is disposed on the second surface 11t side of the polymer film 11.

The first roll 31 is lowered by the shift portion 27 and the second roll 32 is lifted so that the first roll 31 and the second roll 32 are separated from each other by the polymer film (11). As shown in Fig. 3, when the first roll 31 and the second roll 32 move to the film nip position, both end portions in the width direction of the polymer film 11 are pressed against the first roll 31 and the second roll 32 32, so that a nulling area 40 is formed. In the nulling area 40, a plurality of knurls 41 are arranged. Further, when set at the retracted position, the first roll 31 and the second roll 32 are retracted away from the polymer film 11.

Next, the shapes of the surfaces of the first roll 31 and the second roll 32 for knurling the polymer film 11 will be described.

4 (a) is a view showing a knurling pattern on the surface of the first roll 31, and Fig. 4 (b) is an enlarged view of the convex portion of the knurling pattern. Fig. 5 is a view for explaining a mode in which nulling is given to the polymer film 11 by the first roll 31 and the second roll 32. Fig.

As shown in Fig. 4 (a), on the circumferential surface 31a of the first roll 31, a number of knurls 31b corresponding to convex portions are provided at a predetermined pitch. The nulling yarn 31b is formed so as to protrude from the circumferential surface 31a, and is formed in the shape of a quadrangular pyramid. In Fig. 4, although it is formed in a quadrangular pyramidal shape, the shape is not particularly limited, and a shape such as a triangular pyramid shape, a truncated cone shape, or the like can be used. The second roll 32 is the same as the circumferential surface of the first roll 31, and the description thereof will be omitted.

The polymer film 11 is pressed by the knurled yarn 31b of the first roll 31 and the polymer film 11 is deformed into the shape of the tip end of the knurled yarn 31b as shown in Fig. Likewise, the polymer film 11 is pressed by the knurling pawls 32b of the second roll from the opposite side with the polymer film of the first roll 31 interposed therebetween, and the shape of the tip end portion of the knurling pawl 32b The polymer film 11 is deformed.

6 is a cross-sectional view showing an outline of nulling. When knurling is applied from the side of the first surface 11h corresponding to the front side of the polymer film 11 and the side of the second surface 11t corresponding to the back side, The end portion of the knurling rib 31b is formed in the shape of a concave portion 41a and the convex portion is formed on the side of the second surface 11t. On the other hand, on the second surface 11t side of the polymer film 11 by the second roll 32, the end portion of the knurling plug 32b is shaped to form the concave portion 41b, (11h) side has a convex shape. By pressing the polymer film 11 from both sides of the polymer film 11 by using the first roll 31 and the second roll 32, concave and convex portions can be formed on both surfaces of the polymer film.

In the present embodiment, the knurling angle formed by the knurl formed by the first roll 31 and the knurl formed by the second roll 32 is set to 1 ° or more and 89 ° or less. By setting the engagement angle in this range, generation of wrinkles and curling and release of engagement can be prevented.

The surface of the polymer film 11 after knurling is shown in Fig. In the present embodiment, the knurl 41a formed by the knurled rib 31b of the first roll 31 and the knurled rib 41b formed by the knurled rib 32b of the second roll 32 Is set in the range of 1 DEG to 89 DEG.

7 (a) is a view showing a case where the engagement angle is 45 degrees. When the engaging angle is 45 DEG, when knurling is imparted by the first roll 31 and the second roll 32, force can be externally directed by the convex portion, so that it is possible to prevent disengagement . 7A is a view showing the case where the engaging angle is 45 DEG, but it is possible to apply a force toward the outside of the polymer film 11 by setting the angle to be not less than 1 DEG and not more than 89 DEG.

7 (b) is a view showing the case where the engagement angle is 135 degrees. When the engaging angle is 135 °, since the force is applied toward the inside of the film when the knurling is applied to the knurling imparting roll, the polymer film 11 easily shifts from the knurling imparting roll to the inside of the film. Therefore, as the film is deflected inward, wrinkles are generated or disengagement occurs. Fig. 7 (c) shows the engagement angle of 90, and Fig. 7 (d) shows the engagement angle of 0. As shown in Fig. 7 (b), when the engaging angle is 90 ° and the engaging angle is 0 °, it is not so great as to exceed 90 ° but less than 180 °. However, It can not be conveyed, and wrinkles may occur, which is not preferable. Therefore, when the engaging angle is not less than 90 DEG and not more than 180 DEG, wrinkles occur in the film, or the film is disengaged from the knurling roll.

The engagement angle is preferably 1 to 89 degrees, more preferably 10 to 80 degrees, and more preferably 30 to 60 degrees. By setting the engaging angle within the above range, it is possible to balance a force applied in the carrying direction and a force applied to the outside of the polymer film 11, thereby preventing occurrence of wrinkles and curling. When the engaging angle is not less than 1 DEG and not more than 89 DEG, the occurrence of curling and wrinkling can be stably suppressed. However, as described above, since the engaging angle is an average value, it is included in the range of 90 deg. To 180 deg. Therefore, in order to more reliably suppress curling and wrinkling, it is preferable that the engaging angle of all of them is stably set within a range of 1 DEG to 89 DEG and an engaging angle close to 45 DEG. It is preferable that the engagement angle (average value) is not less than 10 degrees and not more than 80 degrees in order to set the engagement angles of all of them in the range of 1 to 89 degrees. It is more preferable that the angle is 30 DEG or more and 60 DEG or less close to 45 DEG.

Further, when the knurl patterns 31b and 32b have a quadrangular pyramidal shape, the knurling applied to the polymer film 11 also has a rectangular shape. The side of the rectangular shape formed on the polymer film 11 is located on the side of the film deformed portion by the nulling yarn 31b of the first roll 31 and the side of the film deformed portion by the nulling yarn 32b of the second roll 32 It is preferable that the nulling yarn 31b of the first roll 31 and the nulling yarn 32b of the second roll 32 are arranged so as to be adjacent to the sides of the film deforming portion caused by the film.

By arranging the sides of the deformed portion of the polymer film 11 so as to be adjacent to each other, the adjacent deformed portions can be adjacently arranged in a linear shape instead of the apexes of the rectangular shapes, so that the nulling shape can be easily stabilized, It can be made strong against the ring. The term " settling " refers to a phenomenon in which a knurled yarn is lowered (becomes smaller) than when a knurling height is imparted by the applied knurl during transport or winding. It is preferable that the sides of the deformed portion are adjacent to each other. It is preferable that the sides of the deformed portion formed by the first roll and the deformed portion formed by the second roll used to obtain the engagement angle are parallel. However, Shall be included.

In order to prevent settling, it is preferable that the shape of the knurled teeth is a rectangular shape. When the knurled teeth shape is a square or a rectangular shape, it is preferable to tilt the direction of the rectangular shape in a range of +/- 35 degrees with respect to the angle of engagement, and more preferably, within a range of +/- 15 degrees. By knurling the knurling in accordance with the engaging angle, the sides of the knurling formed in the polymer film 11 can be made adjacent to the knurling formed of the first roll 31 and the knurl formed of the second roll.

As shown in Figs. 7 (c) and 7 (d), when the angle of inclination is inclined at an angle of 45 [deg.] With respect to the meshing angle with respect to the meshing angle, since the nulling is adjacent at the apex of the quadrangle, This makes it easier to settling.

It is preferable that the size (knurling height) of the convexity formed by the knurling teeth 31b and 32b is 0.5 mu m or more and 40 mu m or less. This range varies depending on the intended use of the web to be produced. In the case where the web is wound after the production, the range is preferably set to 1 to 10 탆, and in the case of midway transportation, the range is preferably set to about 5 to 30 탆 Do. The knurling height is a value obtained by subtracting the film thickness (represented by h ₂ in FIG. 6) of the straight line (not shown) in which knurling is not applied from the total thickness (indicated by h ₁ in FIG. 6) Value.

The total length of the circumferential surfaces of the knurled teeth formed per 1 cm 2 on the circumferential surfaces 31a and 32a is preferably 3 mm or less in order to form a knurling capable of achieving both of prevention of winding deviation and unwinding of unwinding, Or less, more preferably 2.5 mm or less. The total sum is preferably 0.95 mm or more, more preferably 1.0 mm or more. In the circumferential surfaces 31a and 32a, the sum of the circumferential lengths of the upper surface of the knurling teeth formed per 1 cm 2 is preferably 0.95 mm or more, more preferably 1.0 mm or more. The total sum is preferably 3 mm or less, more preferably 2.5 mm or less. The lengths of the circumferential surfaces may be the same or different. The length of each circumferential surface is preferably 0.25 mm or more and 0.70 mm or less, for example. Likewise, the circumferential length of the upper surface of each nulling ring 31b and 32b is preferably 0.25 mm or more and 0.70 mm or less, for example. In addition, it is preferable that the number of the nulling rings 31b and 32b is 50 or more and 120 or less per 1 cm2 in the circumferential surfaces 31a and 32a.

The width W1 of the polymer film 11 is not particularly limited, but is preferably 600 mm or more, more preferably 1400 mm or more and 2500 mm or less. It is also effective when the width W1 of the polymer film 11 is larger than 2500 mm. The thickness of the polymer film 11 is preferably 45 탆 or less, more preferably 40 탆 or less. The lower limit of the thickness of the film is not particularly limited, but is preferably 5 占 퐉 or more from the viewpoint of producing the film. The length of the polymer film 11 is preferably 2000 m or more, more preferably 4000 m or more and 8000 mm or less. The winding radius of the film roll 13 is preferably 450 mm or more, more preferably 650 mm or more and 920 mm or less.

The width W2 of the nulling area 40 is preferably 3.0 x ^10-3 times or more and 20 x ^10-3 times or less the width W1 of the polymer film 11. A margin may be provided between the both side edges 11e of the polymer film 11 and the side edge 40e of the knurling in the direction B and no margin is required. In the case of providing a margin, it is preferable that the width W1 of the polymer film 11 is 5 x 10 < ^-3 >

[Web]

As the web used in the present embodiment, a resin film, paper, metal foil, and nonwoven fabric may be used. Among them, a resin film can be used. For example, a triacetylcellulose (TAC) film, a polyethylene terephthalate (PET) film, or the like can be used. As the film forming method of the resin film, for example, cellulose acylate and cyclic polyphenylene are used in the solution film forming method. In the melt film formation method, for example, cellulose acylate, lactone ring-containing polymer, cyclic polyolefin, polycarbonate and the like are used. Further, details of the cellulose acylate are described in paragraphs [0140] to [0195] of Japanese Patent Application Publication No. 2005-104148. These substrates are also applied to the present invention. Also, additives such as solvents and plasticizers, deterioration inhibitors, ultraviolet absorbers (UV agents), optically anisotropic control agents, retardation control agents, dyes, matting agents, stripping agents and release promoting agents are likewise disclosed in JP 2005-104148 A 0196] to [0516].

[Example]

Hereinafter, the present invention will be described in detail with reference to examples.

The knurling-imparting apparatus was carried out by using the apparatus shown in Fig. The knurled teeth were in the shape of a quadrangular pyramid and were arranged at an angle of 45 DEG with respect to the carrying direction (the shape shown in Fig. 7). The film was made by using a triacetyl cellulose (TAC) film or a polyethylene terephthalate (PET) film and changing the film thickness in the range of 25 to 60 mu m. Further, at each film thickness, the engagement angle was changed, the deflection and disengagement of the film, and the setting ringing of the knurling were evaluated.

The deflection and disengagement of the film were visually evaluated based on the following criteria.

A ... No engaging, no curling and wrinkling

A ~ B ... There is no disengagement, but there are times when curling and wrinkling occur and times when they do not.

B ... Does not disengage but always has curling and wrinkling

C ... With disengagement

The setting of the knurling was evaluated based on the following criteria. The knurling height of the film immediately after knurling is given is based on this. The knurled film was formed into a rectangular sheet having a size of 40 mm x 20 mm and the weight was adjusted so that the surface pressure of the film was evenly adjusted to 2 kPa while the temperature was adjusted to 120 캜. One minute later, the weight was removed. I did a numerical resurrection. The reduction amount of the knurling height was measured as the setting amount based on the state before the weight was placed. The amount of setting was evaluated according to the ratio to the knurling height before placing the weights.

A ... 0% to less than 30%

B ... 30% to less than 40% Settlement

C ... 40% to less than 50%

D ... 50% or more settling

The results are shown in Tables 1 and 2.

[Table 1]

[Table 2]

As a reference example, evaluation was also made for a film thickness of 60 mu m. Good results were obtained at a film thickness of 60 占 퐉 regardless of the engagement angle. This is because, when the film thickness is as large as 60 占 퐉, deflection or curling is caused by the angle of engagement because the film conveying state caused by the nulling roll is unlikely to occur, I think.

When the film thickness is 45 mu m or less, it is possible to prevent the disengagement by making the engagement angle fall within the range of the present invention. The same results were obtained in the examples in which the film thickness was 40 占 퐉 and 25 占 퐉.

The same tendency was also observed in the case where the material of the film was a PET film.

In addition, with regard to setting ringing of the knurling, a good result is obtained in the range of the engagement angle of 30 ° to 60 °, and evaluation is "D" at 0 ° (180 °) and 90 °, Quot; B " and " C " at 90 DEG in the vicinity of 90 DEG and 10 DEG or more and 80 DEG or less in consideration of settling of the knurling.

10 ... Film manufacturing equipment, 11 ... Polymer film, 11e ... Both sides of polymer film, 11h ... The first surface of the polymer film, 11t ... The second surface of the polymer film, 12 ... Film manufacturing equipment, 13 ... Film roll, 14 ... Winding device, 15 ... Nulling device, 21 ... Rejoice, 22 ... Guide roller, 23 ... Pressure roller, 26 ... Nailing-giving roll pairs, 27 ... Shift portion 31, ... The first roll, 31a, 32a ... Circumferential surfaces 31b, 32b ... Nailing, 31x ... The first rotating shaft, 32 ... Second roll, 32x ... The second rotation shaft, 40 ... Nailing-granting area, 40e ... The side of the knurling, 41 ... Knurling, 41a, 41b ... Concave portion

Claims (8)

A step of sandwiching the web from the front side and the back side of the web having a thickness of 45 占 퐉 or less with a first roll and a second roll having a plurality of convex portions to impart knurling to both ends in the width direction of the web,
Wherein an angle of engagement between the convex portion of the first roll and the convex portion of the second roll when sandwiched between the first roll and the second roll is not less than 1 DEG and not more than 89 DEG. The method according to claim 1,
Wherein the web is a resin film. 3. The method according to claim 1 or 2,
Wherein the meshing angle is not less than 10 degrees and not more than 80 degrees. 3. The method according to claim 1 or 2,
Wherein the meshing angle is not less than 30 DEG and not more than 60 DEG. And the first roll and the second roll having a plurality of convex portions from the front side and the back side of both ends in the width direction of the web having a thickness of 45 占 퐉 or less so that the engaging angle of the knurling imparted to the web is 1 ° or more and 89 ° or less Web. 6. The method of claim 5,
Wherein the web is a resin film. The method according to claim 5 or 6,
Wherein the web has an engagement angle of 10 DEG or more and 80 DEG or less. The method according to claim 5 or 6,
Wherein the meshing angle is 30 [deg.] To 60 [deg.].

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