JP6730951B2 - Knurling device and knurling method - Google Patents

Description

The present invention relates to a knurling device and a knurling method.

In the process of producing a long polymer film or in the process of producing a film roll by winding the produced long polymer film into a roll for storage and/or transportation, side edges of the polymer film There may be a case where minute unevenness called knurling is applied to the part. Knurling is provided by guiding a polymer film between a pair of rollers having a plurality of protrusions formed on at least one peripheral surface, and sandwiching the polymer film between these rollers (see, for example, Patent Document 1). The knurling imparted in this way has the function of enhancing the handling of the polymer film and the function of preventing winding deviation or deformation of the film roll.

JP, 2010-221620, A

By the way, in a long polymer film, there may be a slight distribution in thickness in the width direction. Such a thickness distribution may be seen in the target area to which knurling is applied, and it is almost always different depending on the type of polymer film. Further, each of the pair of rollers that impart knurling has a constant diameter in the rotation axis direction. Therefore, although the pair of rollers for imparting the knurling are arranged in a state where the rotation axis directions thereof are substantially parallel to each other, the respective postures are adjusted according to the above-mentioned thickness distribution. Take measures such as ensuring the width of the sandwiching area for sandwiching the polymer film.

However, since the thickness distribution described above is within a range in which the difference in thickness is very small, it is necessary to adjust the postures of the pair of rollers with great precision, which requires a lot of time. Further, when the orientation of the pair of rollers for imparting knurling is adjusted to give an inclination in the rotation axis direction of the roller, the edge in the rotation axis direction of the roller strongly abuts the polymer film, Therefore, damage such as cracking or breaking may occur at the contact portion of the polymer film with the roller.

Therefore, it is an object of the present invention to provide a knurling device and a knurling method in which the attitude of a roller that imparts knurling can be easily adjusted and damage to a polymer film can be prevented.

In order to solve the above-mentioned problem, the present invention has a plurality of protrusions formed on the circumferential surface of at least one of a first roller and a second roller that are rotatably provided. A knurling device that applies knurling to a polymer film by sandwiching it between a first roller and a second roller, wherein at least one of the first roller and the second roller moves toward each edge in the rotation axis direction. It is a gradually decreasing roller whose diameter is gradually decreasing.

It is preferable that the diameter of the gradual reduction roller gradually decreases toward the above-mentioned edge so that the peripheral surface has a rounded shape in a cross section along the rotation axis. It is preferable that the gradual decrease roller has a diameter that changes from the one end edge toward the other end edge such that the peripheral surface has a rounded shape in a cross section along the rotation axis. The rounded shape is preferably an arc shape.

In the gradual reduction roller, the distance from the maximum diameter position where the diameter is maximum to one of the end edges is L1, the distance from the maximum diameter position to the other end edge is L2, and the diameter at the maximum diameter position is DA. When the diameter of one edge is DE1 and the diameter of the other edge is DE2, it is preferable to satisfy the following (1) and (2).
0.0007×L1≦DA-DE1 (1)
0.0007×L2≦DA-DE2 (2)

The effect of the present invention is particularly remarkable when the protrusion has a truncated pyramid shape.

The tapering roller preferably has the above-mentioned plurality of protrusions.

The knurling application method of the present invention includes a conveying step and a knurling application step. In the carrying step, the long polymer film is carried in the longitudinal direction. In the knurling step, the polymer film being conveyed is nipped by the first roller and the second roller to apply knurling to the polymer film. The first roller and the second roller are rotatably provided, and a plurality of protrusions are formed on at least one of the peripheral surfaces. At least one of the first roller and the second roller is a gradual decrease roller whose diameter gradually decreases toward each edge in the rotation axis direction.

ADVANTAGE OF THE INVENTION According to this invention, the attitude|position adjustment of the roller which gives a knurling is easy, and damage to a polymer film is prevented.

It is the schematic which shows the film roll manufacturing equipment which implemented this invention. It is a perspective view of a knurling device. It is a schematic diagram of a taper roller. It is explanatory drawing of the shape of the peripheral surface of a taper roller. It is explanatory drawing of the shape of the peripheral surface of a taper roller. It is explanatory drawing of how to calculate|require the formula of (1) and (2). It is a development schematic diagram of the peripheral surface of a taper roller. It is a perspective view of a protrusion. It is a schematic diagram of a taper roller. It is explanatory drawing in the case where a sandwiching area is set to a part of the rotating shaft direction. It is explanatory drawing in the case where a sandwiching area is set to a part of the rotating shaft direction. It is explanatory drawing in the case where a sandwiching area is set to a part of the rotating shaft direction. It is a schematic diagram of a constant diameter roller. It is a schematic diagram of another fixed diameter roller.

As shown in FIG. 1, a film roll manufacturing facility 10 as an example for carrying out the present invention includes a film manufacturing line 12, a knurling device 13, and a winding device 14. Although not shown, the film production line 12 has a casting device, a tenter, and a drying device, and a long polymer film 16 (for example, TAC (triacetylcellulose) film) is formed by a solution film forming method. To manufacture. However, the film production line 12 is not limited to this example, and may be, for example, a film production line for producing the long polymer film 16 by melt film formation. Further, the film production line 12 may be replaced with a delivery device (not shown) that delivers the polymer film from a pre-manufactured film roll of a long polymer film. Note that the conveying direction of the polymer film 16 is designated by the symbol X.

The winding device 14 has a turret arm 18 and winds the polymer film 16 around a winding core 22 set on a winding shaft 20. The turret arm 18 is intermittently rotated by 180 degrees by an arm driving unit (not shown), and selectively switches the winding core 22 between a winding position PS1 and a winding core replacement position PS2. A guide arm 24 is provided at an intermediate position in the rotation direction of the turret arm 18, and a guide roller 26 is attached to each tip of the guide arm 24. The guide roller 26 supports the polymer film 16 in a state where the polymer film 16 does not come into contact with the turret arm 18 and the arm mounting shaft 28 when the turret arm 18 is rotating.

A winding shaft 20 is provided at each tip of the turret arm 18, and a winding core 22 is set on the winding shaft 20. At the winding position PS1, the polymer film 16 sent from the conveying roller 30 is wound around the winding core 22. Further, at the winding core exchange position PS2, the polymer film 16 having a fixed length is wound up, and the fully wound film roll 32 is removed together with the winding core 22 from the winding shaft 20. The empty core 22 is set, and the core 22 is replaced.

When the polymer film 16 having a predetermined length is wound around the winding core 22 at the winding position PS1 and the film roll 32 is in a state close to full winding, the turret arm 18 rotates 180 degrees, The film roll 32 close to full winding is positioned at the exchange position PS2. An empty winding core 22 is positioned at the winding position PS1. When the film roll 32 has a predetermined length, a rewinding device (not shown) is activated to cut the polymer film 16. The cut rear end portion of the preceding polymer film 16 is wound around the film roll 32 at the core replacement position PS2. In addition, the leading end of the cut polymer film 16 in the subsequent line is wound around the empty winding core 22 at the winding position PS1.

In the same manner, the polymer film 16 is wound around the winding core 22 in the same manner, whereby the continuously fed polymer film 16 becomes a product in the form of the film roll 32. The polymer film 16 thus obtained is used as, for example, a polarizing plate protective film or a retardation film. Further, the polymer film 16 may be provided with an optically anisotropic layer, an antireflection layer, an antiglare function layer, etc., and may be used as a high-performance film.

The polymer film 16 manufactured in the film manufacturing line 12 is conveyed to the winding position PS of the winding device 14 by the conveying roller 30 (conveying step). However, the transportation is not limited to the method using the transportation roller 30 arranged in the winding device 14. For example, the conveying roller 30 may be provided at the downstream end of the film production line 12, or the conveying roller 30 may be provided between the film production line 12 and the winding device 14.

A knurling device 13 is provided between the film production line 12 and the winding device 14. The knurling device 13 includes a taper roller 35 as a first roller arranged on one film surface side of the polymer film 16 and a taper roller 36 as a second roller arranged on the other film surface side. The details of the gradual reduction roller 35 and the gradual reduction roller 36 will be described later with reference to another drawing, but the diameters of the gradual reduction roller 35 and the gradual reduction roller 36 are gradually reduced toward the respective edges in the rotation axis direction (see FIGS. 3, 7, and 9). ing. However, in FIG. 1 and FIG. 2, for the sake of convenience, the gradual decrease roller 35 and the gradual decrease roller 36 are drawn with a constant diameter. Further, the knurling device 13 preferably includes a temperature control mechanism 37 and a pressure adjuster 38, which is also the case in the present embodiment.

The gradual reduction roller 35 and the gradual reduction roller 36 are rotatably provided. The gradual decrease roller 35 and the gradual decrease roller 36 in the present embodiment are rotated by a motor (not shown). It should be noted that the rotary shaft of the gradual reduction roller 35 is denoted by reference numeral 35a, and the rotary shaft of the gradual reduction roller 36 is denoted by reference numeral 36a. The rotation direction is the conveying direction of the polymer film 16, that is, the clockwise direction in FIG. 1 for the gradual decrease roller 35 and the counterclockwise direction in FIG. 1 for the gradual decrease roller 36. A plurality of protrusions (knurling teeth) 41 are formed on the peripheral surface of the gradually decreasing roller 36. The gradual reduction roller 35 and the gradual reduction roller 36 press the polymer film 16 in the thickness direction by nipping the polymer film 16 being conveyed. As a result, the protrusion 41 is pressed against the polymer film 16 and the knurling 42 (see FIG. 2) having fine irregularities is applied to the polymer film 16 (knurling step).

In this example, when the conveying path of the polymer film 16 is viewed from the side as shown in FIG. 1, the gradually decreasing roller 35 and the gradually decreasing roller 36 are arranged in the vertical direction in FIG. The polymer film 16 is sandwiched in a state of being maintained in the shape. That is, the polymer film 16 is simply clamped without being wound around both the gradually decreasing roller 35 and the gradually decreasing roller 36. However, the present invention is not limited to this mode. For example, by disposing the gradual decrease roller 35 on the upstream side in the transport direction X of the polymer film 16 with respect to the gradual decrease roller 36, the polymer film 16 is provided both in the gradual decrease roller 35 and the gradual decrease roller 36. It may be a mode in which it is wound around, or a mode in which it is wound around only one of them.

The temperature control mechanism 37 adjusts the temperature of each circumferential surface of the gradual decrease roller 35 and the gradual decrease roller 36 by controlling heaters (not shown) incorporated in the gradual decrease roller 35 and the gradual decrease roller 36, respectively. The temperature control mechanism 37 may adjust the temperature with either the gradually decreasing roller 35 or the gradually decreasing roller 36. The temperature of each circumferential surface of the gradual decrease roller 35 and the gradual decrease roller 36 is adjusted to 120° C. in the present embodiment, but the temperature is not limited to this temperature, and is preferably in the range of 70° C. or higher and 250° C. or lower, for example, 100° C. More preferably, the temperature is in the range of ℃ to 200 ℃.

The pressure adjuster 38 provided on the gradual reduction roller 36 adjusts the pressing force (hereinafter, simply referred to as pressing force) applied to the polymer film 16 by the gradual decrease roller 35 and the gradual decrease roller 36 when the shape of the protrusion 41 is transferred. It is a thing. The pressure adjuster 38 more reliably applies the knurling 42 by adjusting the pressing force. In this example, the pressure adjuster 38 is provided on the gradual decrease roller 36, but the present invention is not limited to this example and may be provided on at least one of the gradual decrease roller 35 and the gradual decrease roller 36. The pressing force per 1 mm in the rotation axis direction (see FIGS. 3, 7, and 9) is 1N in the present embodiment, but is not limited to this, and is preferably in the range of 0.5N or more and 10N or less.

In this embodiment, since the knurling 42 is provided on both side ends of the polymer film 16, the knurling device 13 includes two pairs of rollers, which are a gradually decreasing roller 35 and a gradually decreasing roller 36, as shown in FIG. Note that the width Y of the long polymer film 16 (hereinafter, simply referred to as “width direction”) is denoted by the symbol Y. The roller pair is arranged in a passage area of the conveyance path of the polymer film 16 through which each side end of the polymer film 16 passes. The temperature control mechanism 37 and the pressure adjuster 38 described above are provided for each roller pair in this example, but are not shown in FIG. 2 in order to avoid complication of the drawing.

In this example, the circumferential surface 35s of the gradual decrease roller 35 and the circumferential surface 36s of the gradual decrease roller 36 have substantially the same size in the width direction Y, and the gradual decrease roller 35 and the gradual decrease roller 36 have a circumferential surface 35s and a circumferential surface 36s. The polymer film 16 is sandwiched in the entire area in the width direction Y. That is, the entire width of the circumferential surface 35s and the circumferential surface 35s in the width direction Y is the width of the sandwiching region for sandwiching the polymer film 16 between the gradually decreasing roller 35 and the gradually decreasing roller 36. As a result, the knurling 42 is continuously applied in the longitudinal direction of the polymer film 16 with the width of the sandwiching region. Further, although each roller pair in this example is arranged inside the side edge 16E of the polymer film 16 in the width direction Y, the position of each roller pair in the width direction Y is not limited to this. For example, each roller pair may be arranged such that the side edge 16E and the outer edges of the tapering roller 35 and the tapering roller 36 in the width direction Y coincide with each other in the width direction Y.

The knurling device 13 preferably includes a posture adjusting unit 43, which is also the case in the present embodiment. The attitude adjusting unit 43 is for adjusting the attitudes of the gradually decreasing roller 35 and the gradually decreasing roller 36. The attitude adjusting unit 43 is connected to the rotary shaft 35a and the rotary shaft 36a, and adjusts the respective attitudes of the gradually decreasing roller 35 and the gradually decreasing roller 36 by adjusting the inclinations of the rotating shaft 35a and the rotating shaft 36a. .. The attitude adjustment unit 43 adjusts the attitude of at least one of the gradually decreasing roller 35 and the gradually decreasing roller 36 based on the distribution of the thickness in the width direction Y, thereby adjusting the distribution of the pressing force in the width direction Y.

For example, when the polymer film 16 whose thickness is gradually reduced toward the side edge 16E at the side end is conveyed to the knurling device 13, the outer edge of the gradually decreasing roller 35 in the width direction Y is shown in FIG. The postures of the gradual decrease roller 35 and/or the gradual decrease roller 36 are adjusted so that the outer edge of the gradual decrease roller 36 in the width direction Y is displaced upward and/or displaced downward in FIG. On the other hand, when the polymer film 16 whose thickness gradually increases toward the side edge 16E at the side end portion is conveyed to the knurling device 13, the outer end edge of the gradually decreasing roller 35 in the width direction Y in FIG. The attitude of the gradual decrease roller 35 and/or the gradual decrease roller 36 is adjusted so that the outer edge in the width direction Y of the gradual decrease roller 36 is displaced downward and is displaced upward in FIG. By adjusting the posture in this way, the inclinations of the peripheral surface 35s of the gradually decreasing roller 35 and the peripheral surface 36s of the gradually decreasing roller 36 with respect to the film surface of the guided polymer film 16 are adjusted. The polymer film 16 is sandwiched between the roller 36 and the entire sandwiching region in the Y direction. As a result, the knurling 42 having a target width is more surely applied.

In FIG. 3, the gradual decrease roller 35 has no protrusion provided on the peripheral surface 35s, that is, the peripheral surface 35s is substantially smooth. The diameter D of the gradual reduction roller 35 gradually decreases as it goes toward the one edge 35Ea and the other edge 35Eb in the rotation axis direction. As a result, even if the posture is not adjusted more precisely than the conventional knurling roller having a constant diameter, the taper roller 35 aims at the polymer film 16 in the entire width of the nipping area to be nipping with the taper roller 36. Hold it securely with the pressing force. As described above, since the posture of the tapering roller 35 can be easily adjusted, the time required for the posture adjustment of the tapering roller 35 can be shortened, so that the manufacturing efficiency is improved. In some cases, the polymer film 16 can be held in the entire width of the holding area without adjusting the posture. Further, since the diameter D gradually decreases toward the edges 35Ea, 35Eb, the contact pressure at the contact between the polymer film 16 and the edges 35Ea, 35Eb is suppressed to be extremely small even if the attitude of the gradually decreasing roller 35 is changed. Therefore, damage to the polymer film 16 is prevented. Therefore, when the polymer film 16 is a thin film (for example, the thickness is 50 μm or less) and is a high brittleness (for example, the tensile elongation (breaking elongation) at room temperature (approximately 25° C.) is 40% or less) It is especially effective for For example, when the polymer film 16 is a TAC (triacetyl cellulose) film, the tensile elongation is 30%, which is particularly effective. The gradual decrease of the diameter D may be either stepwise or continuous, but it is preferable that the diameter D is continuous, and this is also the case in this example. Thereby, the contact pressure with the polymer film 16 is suppressed from locally increasing, and the polymer film 16 is more reliably prevented from being damaged.

In this example, the end portion in the rotation axis direction has a convex curved shape in cross section along the rotation axis 35a of the peripheral surface 35s as shown in FIG. 3, but the end edge 35Ea and the end edge 35Eb are The cross-sectional shape of the peripheral surface 35s along the rotation axis 35a is not particularly limited as long as the diameter D gradually decreases toward each direction. For example, the cross-sectional shape of the peripheral surface 35s at the end in the rotation axis direction along the rotation axis 35a may be a straight line as shown in FIG. 4 or may be a concave curved shape as shown in FIG. However, in the cross section along the rotation axis 35a, the circumferential surface 35s has a convex curved shape, that is, a rounded shape as shown in FIG. Is more preferable, and this is the case in this example as well. As a result, even if the posture of the gradually decreasing roller 35 is changed, the polymer film 16 is more reliably sandwiched in the entire width region of the sandwiching region, and strong contact of the end edges 35Ea and 35Eb with the polymer film 16 is more reliably avoided. To be done. In addition, as shown in FIG. 4 and FIG. 5, in the case where the sectional shape of the peripheral surface 35s of the end portion SP in the rotation axis direction along the rotation axis 35a is a straight line and the case of a concave curved shape, Between the one end SP and the other end SP, it is preferable to provide a central portion CP having a round cross-sectional shape of the peripheral surface 35s in the rotation axis direction. Further, it is preferable that the peripheral surface 35s is gently connected at the connection position CA between the central portion CP and the end portion SP.

There may be a constant portion (not shown) having a constant diameter D at the center in the rotation axis direction. That is, a configuration may be adopted in which a constant portion having a constant diameter D is provided at the center in the rotation axis direction, and a gradually decreasing portion where the diameter D is gradually reduced is provided at each end of the constant portion in the rotation axis direction. However, without providing this constant portion, as shown in FIG. 3, the cross-sectional shape of the peripheral surface 35s along the rotation axis 35a is rounded, and the diameter D increases from the edge 35Ea to the edge 35Eb. More preferably, it has changed. That is, in this example, the diameter D gradually increases from the end edge 35Ea toward the center in the rotation axis direction, reaches the maximum in the center, and gradually decreases from the center toward the end edge 35Eb. In other words, this example is an aspect in which the pair of taper portions are integrated by continuously connecting the one ends where the diameters of the pair of taper portions are large so as to face each other. As a result, even if the posture of the gradually decreasing roller 35 is changed, the polymer film 16 is more reliably sandwiched in the entire width region of the sandwiching region, and strong contact of the end edges 35Ea and 35Eb with the polymer film 16 is more reliably avoided. To be done.

The above-mentioned rounded shape is not particularly limited, and may be, for example, an arc, an elliptic arc, a hyperbola, etc., but an arc is particularly preferable. As a result, even if the posture of the gradually decreasing roller 35 is changed, the polymer film 16 is more reliably sandwiched in the entire width region of the sandwiching region, and strong contact of the end edges 35Ea and 35Eb with the polymer film 16 is more reliably avoided. Because it is done. Also in this example, a circular arc is used.

In the gradually decreasing roller 35, the distance from the position PA where the diameter D is maximum in the rotation axis direction (hereinafter referred to as the maximum diameter position) PA to the edge 35Ea is L1, and the distance from the maximum diameter position PA to the edge 35Eb is L2. And Further, the diameter D of the maximum diameter position PA is DA, the diameter D of the edge 35Ea is DE1, and the diameter D of the edge 35Eab is DE2. The gradual reduction roller 35 preferably satisfies the following (1) and (2).
0.0007×L1≦DA-DE1 (1)
0.0007×L2≦DA-DE2 (2)
Among (1), 0.0014×L1≦DA-DE1 is more preferable, and 0.0021×L1≦DA-DE1 is still more preferable. Among (2), 0.0014×L2≦DA-DE2 is more preferable, and 0.0021×L2≦DA-DE2 is further preferable.

The equations (1) and (2) are derived by the following method. As shown in FIG. 6, when the attitude of the gradually decreasing roller 35 is changed by changing the inclination of the rotation shaft 35a with an arbitrary point (upper end point in FIG. 6) on the maximum diameter position PA as the rotation center RC. At θ, the angle of change in inclination is. As described above, the change in the inclination of the rotation shaft 35a adjusts the inclination of the peripheral surface 35s with respect to the film surface of the polymer film 16, and thus is shown in FIG. 6 in which the upper end point on the maximum radial position PA is the rotation center RC. The mode is the case where the polymer film 16 is located on the upper side in FIG. Note that FIG. 6 shows a case where the left edge 35Eb of the paper surface is displaced upward in FIG. 6 and the right edge 35Ea of the paper surface is displaced downward in FIG.

The length DM of the movement locus of the edge 35Ea due to the change in the attitude of the gradually decreasing roller 35 is L1×θ, and the length DM of the movement locus of the edge 35Eb is L2×θ. Since both DA-DE1 and DA-DE2 are based on the thickness distribution of the polymer film 16 in which the thickness difference is in a very small range, DA-DE1 is extremely smaller than L1. In addition, DA-DE2 is extremely smaller than L2. Therefore, the length DM of the movement locus is regarded as the displacement length of the edge 35Ea and the edge 35Eb in the vertical direction in FIG. Of the end edges 35Ea and 35Eb, the one located at the upper side in FIG. 6 is the end edge 35Eb, and when the attitude of the gradually decreasing roller 35 is changed, the end edge 35Ea protrudes above the maximum diameter position PA. Without this, it was thought that the polymer film 16 could be more reliably prevented from being damaged by the strong contact of the edge 35Eb. The same applies when the edge 35Eb is displaced downward in FIG. 6 and the edge 35Ea is displaced upward in FIG. Therefore, the condition that does not protrude like this is
L1×θ≦DA/2-DE1/2 (1a)
L2×θ≦DA/2-DE2/2 (2a)
Is. Since θ is set in the range of 0.00035 rad (about 0.02°) when the conventional roller having the constant diameter R is used, θ=0.00035 is defined as the above (1a). The above equations (1) and (2) are derived by substituting the equations with (2a) and modifying the equations after substitution.

It is more preferable that the gradual reduction roller 35 satisfy the following (3) and (4) in addition to the above (1) and (2). This is because the polymer film 16 is more reliably sandwiched in the entire width region of the sandwiching region, and strong contact between the polymer film 16 and the maximum radial position PA and its periphery is more reliably avoided. T in the following (3) and (4) is the thickness of the polymer film 16. When the polymer film 16 has a thickness distribution in the width direction Y, the minimum thickness in the sandwiching region is T.
DA/2-DE1/2≦T (3)
DA/2-DE2/2≦T (4)
Among (3), DA/2-DE1/2≤T/2 is more preferable, and DA/2-DE1/2≤T/3 is further preferable. Among (4), DA/2-DE2/2≦T/2 is more preferable and DA/2-DE2/2≦T/3 is further preferable.

The above (3) and (4) are derived by the following method. That is, in order to sandwich the polymer film 16 in the entire width region of the sandwiching region of the taper roller 35, it is more preferable that the difference in the radius of the taper roller 35 in the rotation axis direction is smaller than the thickness T than the thickness T. It was The difference between the radius at each of the edges 35Ea and 35Eb and the radius at the maximum diameter position is DA/2-DE1/2 and DA/2-DE2/2, respectively. Expressions of this are (3) and (4).

In this example, the distance LA between the edge 35Ea and the edge 35Eb is approximately 10 mm, and the diameter DA of the maximum radial position PA is approximately 100 mm, but the present invention is not limited to this example.

The peripheral surface 36s of the gradually decreasing roller 36 will be described with reference to FIGS. 7 and 8. In the present example, the aforementioned protrusions 41 are formed side by side in a matrix on the peripheral surface 36s, but the arrangement of the plurality of protrusions 41 may be a square arrangement. In the present embodiment, the projection group in which the number of rows, which is the number in the rotation axis direction, is n (n is a natural number of 25 or less) and the projection group in which the number of rows is (n+1) rows are arranged in the circumferential direction ( They are arranged alternately in the vertical direction on the paper surface). However, the number of each of the above projection groups may not be constant. For example, a mode in which some of the protrusions 41 in the protrusion group are not formed may be adopted. As such an aspect, among the protrusions 41 shown in FIG. 7, there is a case where a group of the protrusions 41 arranged in the circumferential direction is not formed.

Since the diameter D (see FIG. 9) of the gradually decreasing roller 36 gradually decreases toward the respective edges 36Ea and 36Eb as described above, the area of the peripheral surface 36s becomes closer to the edges 36Ea and 36Eb in the rotation axis direction. It is small but small. For this reason, the pitch P41 of the protrusions 41 provided on the peripheral surface 36s in the rotation axis direction also becomes slightly smaller toward the edges 36Ea and 36Eb. However, in FIG. 7, each pitch P41 is drawn equally for convenience. The pitch P41 of the protrusions 41 in the rotation axis direction is preferably 1.0 mm or more and 3.0 mm or less.

The protrusion 41 has a truncated pyramid shape in this embodiment, more specifically, a truncated pyramid shape. However, the truncated pyramid shape is not limited to the truncated pyramid shape, and may be another truncated pyramid shape such as a truncated pyramid shape or a pentagonal pyramid shape. The protrusion 41 is not limited to the truncated pyramid shape, and may have a truncated cone shape, a spherical crown shape (for example, a hemispherical shape), or extend in the rotation axis direction or a direction intersecting (for example, orthogonal to) the rotation axis. It may be an extended protrusion (not shown). As the extended protrusion, for example, there is one in which the cross-sectional shape of the surface of the protrusion is wavy. However, in the case of the truncated pyramid shape as in this example, even if the posture of at least one of the gradually decreasing roller 35 and the gradually decreasing roller 36 is changed, the polymer film 16 is more reliably sandwiched in the entire width region of the sandwiching region. And the effect of more surely avoiding the strong contact of the edges 35Ea, 35Eb of the tapering roller 35 and/or one edge 36Ea, 36Eb of the tapering roller 36 with the polymer film 16 are more reliable.

In FIG. 8, the height H41 of the protrusion 41 is 0.5 mm, the length Lb of one side of the bottom surface is 0.5 mm, and the length Lt of one side of the top surface 41t is 0.2 mm. The height H41 is preferably in the range of 0.1 mm to 1.0 mm, the length Lb is in the range of 0.1 mm to 1.0 mm, and the Lt is preferably in the range of 0.05 mm to 0.5 mm.

As with the gradual decrease roller 35, the gradual decrease roller 36 has a diameter D that gradually decreases toward the one end edge 36Ea and the other end edge 36Eb in the rotation axis direction, as shown in FIG. As a result, the polymer film 16 is clamped in the entire width region of the clamping region of the taper roller 36, even if the posture is not adjusted as finely as in the conventional roller having a constant diameter. As described above, since the posture of the tapering roller 35 can be easily adjusted, the time required for the posture adjustment of the tapering roller 36 can be shortened, so that the manufacturing efficiency is improved. Further, since the diameter D gradually decreases toward the edges 36Ea, 36Eb, even if the attitude of the gradually decreasing roller 36 is changed, the contact between the polymer film 16 and the edges 36Ea, 36Eb is suppressed to an extremely small contact pressure. Therefore, damage to the polymer film 16 is prevented. Note that in FIG. 9, only a part of the plurality of protrusions 41 is drawn in order to avoid complication of the drawing.

As shown in FIG. 9, the diameter D of the gradually decreasing roller 36 is defined on the peripheral surface 36s by regarding the curved surface that virtually connects the upper surfaces 41t (see FIG. 8) of the plurality of protrusions 41 as the peripheral surface 36s. .. In this example, the plurality of protrusions 41 are all formed with the same height H41, but a mode in which some of the protrusions 41 are formed low, that is, the upper surfaces 41t of some of the protrusions 41 are lower than the curved surface. It may be in a position. In the present embodiment, if the number is 1/5 or less of all the protrusions 41, it is regarded as the “partial protrusion 41”.

The configuration of the gradual reduction roller 36 is the same as that of the gradual reduction roller 35 except that a plurality of protrusions 41 are formed on the peripheral surface 36s as shown in FIG. Similarly to the gradual decrease roller 35, the gradual decrease roller 36 has a shape in which the peripheral surface 36s has a rounded shape and the diameter D gradually decreases toward the end edge 36Ea and the end edge 36Eb in the cross section along the rotation axis 36a. Therefore, even if the posture of the taper roller 36 is changed, the polymer film 16 is more reliably sandwiched in the entire width region of the sandwiching region, and the strong contact of the end edges 36Ea and 36Eb with the polymer film 16 is more reliably avoided. To be

The taper roller 36 may have a constant portion (not shown) with a constant diameter D at the center in the rotation axis direction, but in this example, the cross-sectional shape of the peripheral surface 36s along the rotation axis 36a is rounded. In the shape, since the diameter D changes from the edge 36Ea toward the edge 36Eb, even if the posture of the taper roller 36 is changed, the polymer film 16 is more reliably held in the entire width area of the holding area, and The strong contact of the edges 36Ea and 36Eb with the polymer film 16 is more reliably avoided.

Also in the gradual reduction roller 36, the distance from the position PA where the diameter D is maximum in the rotation axis direction (hereinafter referred to as the maximum diameter position) PA to the edge 35Ea is L1, and the distance from the maximum diameter position PA to the edge 35Eb is L2. Further, the diameter D of the maximum diameter position PA is DA, the diameter D of the edge 35Ea is DE1, and the diameter D of the edge 35Eab is DE2. The gradual reduction roller 36 exhibits the same action as that of the gradual reduction roller 35 by satisfying the above (1) and (2) similarly to the gradual reduction roller 35. Further, the gradual reduction roller 36 exhibits the same action as that of the gradual reduction roller 35 by satisfying the above (3) and (4) similarly to the gradual reduction roller 35.

In the above example, the sandwiching regions of the gradually decreasing roller 35 and the gradually decreasing roller 36 are set to the entire width range of the peripheral surface 35s and the peripheral surface 36s in the rotation axis direction. It may be set on a part of the peripheral surface of. For example, as shown in FIG. 10, the gradually decreasing roller 35 may be replaced with a gradually decreasing roller 45 having a size in the rotation axis direction larger than that of the gradually decreasing roller 35. The rotary shaft of the gradually decreasing roller 45 is denoted by reference numeral 45a. In this example, only a part of the center in the rotation axis direction of the peripheral surface 45s of the gradually decreasing roller 45 is set as the nipping area NA, and each end is not planned as the nipping area NA. The diameter of each end that is not planned as the holding area NA is smaller than the diameter in the holding area NA. In this way, when the sandwiching area NA is set only in a part in the rotation axis direction, the respective edges of the sandwiching area NA in the rotation axis direction are regarded as the edge 35Ea and the edge 35Eb of the gradually decreasing roller 35. Therefore, in this example, the diameter D of the end edge of the holding area NA in the rotation axis direction is regarded as DE1 and DE2 described above, and the distance between the maximum diameter position PA and each end edge of the holding position NA in the rotation axis direction is set as described above. Consider L1 and L2.

Further, as shown in FIG. 11, the gradual decrease roller 35 may be replaced with the gradual decrease roller 45 described above, and the gradual decrease roller 36 may be replaced with a gradual decrease roller 46 having a size in the rotation axis direction larger than the gradual decrease roller 36. Like the peripheral surface 36s of the taper roller 36, a plurality of protrusions 41 are formed on the entire area of the peripheral surface 46s of the taper roller 46. The rotary shaft of the gradually decreasing roller 46 is denoted by reference numeral 46a. In this example, only a part of the center of the peripheral surface 45s and the peripheral surface 46s in the rotation axis direction is set as the sandwiching area NA, and each end portion is not planned as the sandwiching area. This example is also a case where the sandwiching area NA is set only in a part in the rotation axis direction. Therefore, similarly to the case of the gradually reducing roller 45, the gradual reduction roller 46 has each edge in the rotation axis direction. It is considered as the edge 36Ea and the edge 36Eb in the gradually decreasing roller 36. Therefore, the diameter D of the edge of the holding area NA in the rotation axis direction is regarded as DE1 and DE2 described above, and the distance from the maximum diameter position PA to each edge of the holding position NA in the rotation axis direction is regarded as L1 and L2 described above. ..

Furthermore, as shown in FIG. 12, the gradual decrease roller 35 may be replaced with the gradual decrease roller 45 described above, and the gradual decrease roller 36 may be replaced with a gradual decrease roller 47 having a size in the rotation axis direction larger than the gradual decrease roller 36. A plurality of protrusions 41 are formed only on a part of the center in the rotation axis direction on the peripheral surface 47s of the gradually decreasing roller 47. The rotary shaft of the gradually decreasing roller 47 is denoted by reference numeral 47a. In this example, only a part of the center of the peripheral surface 45s and the peripheral surface 47s in the rotation axis direction is set as the sandwiching area NA, and each end is not scheduled as the sandwiching area. The gradually decreasing roller 47 is provided with the protrusion 41 only in the sandwiching area NA. Also in this example, the sandwiching area NA is set only in a part in the rotation axis direction. Therefore, similarly to the case of the gradually decreasing roller 45, each edge of the sandwiching area NA in the rotation axis direction is set to the gradually decreasing roller 47. It is considered as the edge 36Ea and the edge 36Eb in the gradually decreasing roller 36. Therefore, the diameter D of the edge of the holding area NA in the rotation axis direction is regarded as DE1 and DE2 described above, and the distance from the maximum diameter position PA to each edge of the holding position NA in the rotation axis direction is regarded as L1 and L2 described above. .. As described above, the diameter of the taper roller may be gradually decreased toward the respective edges in the rotation axis direction in the nipping region with the pair of rollers.

In the roller pair, the gradually decreasing roller 35 and the gradually decreasing roller 36 may be arranged in reverse. That is, the gradually decreasing roller 36 may be the first roller and the gradually decreasing roller 35 may be the second roller. Further, by replacing the gradually decreasing roller 35 as the first roller with the gradually decreasing roller 36, the gradually decreasing roller 36 may be used as both the first roller and the second roller. In this case, it is preferable to dispose both of the taper rollers 36 in a state where the projection 41 of the taper roller as the first roller and the concave portion between the projections 41 of the taper roller 36 as the second roller face each other.

When the taper roller 35 is used as the above-mentioned first roller, the second roller is not limited to the taper roller 36. As the second roller in this case, there is a constant diameter roller 60 having a constant diameter D as shown in FIG. The constant-diameter roller 60 has a plurality of protrusions 41 formed on the circumferential surface, similarly to the gradually decreasing roller 36. The posture adjusting unit 43 is connected to the rotary shaft 60a, and the posture of the constant diameter roller 60 is adjusted by changing the inclination of the rotary shaft 60a. Note that in FIG. 13, only a part of the plurality of protrusions 41 is drawn in order to avoid complication of the drawing.

Further, the gradually decreasing roller 35 and the constant diameter roller 60 may be arranged in reverse, that is, the constant diameter roller 60 may be the first roller and the gradually decreasing roller 35 may be the second roller. By using the taper roller 35 for either one of the first roller and the second roller, one end 60Ea or the other end 60Eb of the polymer film 16 and the constant diameter roller 60 may be changed depending on the posture change of the constant diameter roller 60. Even when they come into contact with each other, the pressing force by the gradually decreasing roller 35 and the constant diameter roller 60 is suppressed to be small, so that the damage to the polymer film 16 is suppressed. As described above, when the gradually decreasing roller 35 is used as either one of the first roller and the second roller, it is sufficient that the plurality of protrusions 41 are formed on the other side, and the diameter D is toward the side edge. It does not need to be a gradually decreasing roller. However, as compared with the combination of the gradually decreasing roller 35 and the constant diameter roller 60, the combination of the gradually decreasing roller 35 and the gradually decreasing roller 36 is more preferable.

When the taper roller 36 is used as the above-mentioned second roller, the first roller is not limited to the taper roller 35. As the first roller in this case, there is a constant diameter roller 70 having a constant diameter D as shown in FIG. The constant-diameter roller 70 does not have the protrusion 41, like the taper roller 35, and has a substantially smooth peripheral surface. The posture adjusting unit 43 is connected to the rotary shaft 70a, and the posture of the constant diameter roller 70 is adjusted by changing the inclination of the rotary shaft 70a.

Further, the gradually decreasing roller 36 and the constant diameter roller 70 may be arranged in reverse, that is, the gradually decreasing roller 36 may be the first roller and the constant diameter roller 70 may be the second roller. By using the taper roller 36 for either one of the first roller and the second roller, the one end 70Ea or the other end 70Eb of the polymer film 16 and the constant diameter roller 70 is changed depending on the posture change of the constant diameter roller 70. Even when they come into contact with each other, the pressing force of the gradually decreasing roller 36 and the constant diameter roller 70 is suppressed to be small, so that the polymer film 16 is prevented from being damaged. In this way, when the gradually decreasing roller 36 is used as either one of the first roller and the second roller, the other one may not be the gradually decreasing roller. However, as compared with the combination of the gradually decreasing roller 36 and the constant diameter roller 70, the combination of the gradually decreasing roller 35 and the gradually decreasing roller 36 is more preferable.

Further, although the example in which the knurling 42 is provided between the film manufacturing line 12 and the winding device 14 has been described, by disposing the knurling device 13 in the film manufacturing line, the knurling is performed on the film being manufactured. 42 may be added.

10 film roll manufacturing equipment 12 film manufacturing line 13 knurling device 14 winding device 16 polymer film 16E side edge of polymer film 18 turret arm 20 winding shaft 22 winding core 24 guide arm 26 guide roller 28 arm mounting shaft 30 transport roller 32 film Roll 35 Gradual reduction roller 35a Rotational shaft 35Ea, 35Eb End edge 35s Circumferential surface 36 Gradual reduction roller 36a Rotational shaft 36Ea, 36Eb End edge 36s Circumferential surface 37 Temperature control mechanism 38 Pressure adjuster 41 Protrusion 41t Top surface 42 Knurling 43 Attitude adjustment part 45 Gradual reduction roller 45 45a rotating shaft 45s peripheral surface 46 gradually decreasing roller 46a rotating shaft 46s peripheral surface 47 gradually decreasing roller 47a rotating shaft 47s peripheral surface 60 constant diameter roller 60a rotating shaft 60Ea, 60Eb edge 70 constant diameter roller 70a rotating shaft 70Ea, 70Eb center edge Position of connection between part and end CP Central part D Diameter DA Diameter at maximum diameter position DE1 Edge diameter DE2 Edge diameter H41 Protrusion height L1 Distance between maximum diameter position and edge L2 Maximum diameter position Distance from the edge LA Distance from the edge to the edge Lb Length of one side of the bottom surface of the protrusion Lt Length of one side of the upper surface of the protrusion NA Holding region P41 Pitch of the protrusion PA Maximum diameter position SP Edge portion X Polymer film Transport direction Y Width direction of polymer film

Claims (7)

A plurality of protrusions are formed on the circumferential surface of at least one of the rotatably provided first roller and second roller, and the polymer film being conveyed is nipped by the first roller and the second roller. In a knurling device that imparts knurling to the polymer film by
Wherein at least one of the first roller and the second roller, Ri Ah with decreasing roller diameter toward the respective end edge of the rotation axis direction is gradually decreased,
In the taper roller, the distance from the maximum diameter position where the diameter is maximum to one of the end edges is L1, the distance from the maximum diameter position to the other end edge is L2, and the diameter at the maximum diameter position is Is DA, the diameter of the one edge is DE1, and the diameter of the other edge is DE2, a knurling device satisfying the following (1) and (2) .
0.0007×L1≦DA-DE1 (1)
0.0007×L2≦DA-DE2 (2) The knurling device according to claim 1, wherein the gradually decreasing roller has the diameter gradually decreasing toward the edge so that the peripheral surface has a rounded shape in a cross section along the rotation axis. The diameter of the taper roller gradually changes from the one end edge toward the other end edge so that the peripheral surface has a rounded shape in a cross section along the rotation axis. The knurling device described in 2. The knurling device according to claim 2 or 3, wherein the rounded shape is an arc shape. The knurling device according to any one of claims 1 to 4 , wherein the protrusion has a truncated pyramid shape. The knurling device according to any one of claims 1 to 5 , wherein the tapering roller has the plurality of protrusions. A conveying step of conveying a long polymer film in the longitudinal direction,
A plurality of protrusions are formed on the circumferential surface of at least one of the rotatably provided first roller and second roller, and the polymer film being conveyed is conveyed by the first roller and the second roller. And a knurling applying step of applying knurling to the polymer film by sandwiching,
Wherein at least one of the first roller and the second roller, Ri Ah with decreasing roller diameter toward the respective end edge of the rotation axis direction is gradually decreased,
In the taper roller, the distance from the maximum diameter position where the diameter is maximum to one of the end edges is L1, the distance from the maximum diameter position to the other end edge is L2, and the diameter at the maximum diameter position is Is DA, the diameter of the one edge is DE1, and the diameter of the other edge is DE2, a knurling application method satisfying the following (1) and (2) .
0.0007×L1≦DA-DE1 (1)
0.0007×L2≦DA-DE2 (2)

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