JPH0755747B2 - Film winding method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a film winding method, and more particularly to a film winding method in which unevenness is applied to the end portion of the film before winding the film into a roll shape. .

[Prior Art] Conventionally, when a film made of a synthetic resin or the like is wound into a roll, the film is wound near the end in the width direction of the film before winding.
A method is known in which a film is subjected to mechanical unevenness processing by using an embossing ring whose surface is finished to be uneven.

For example, in Japanese Examined Patent Publication (Kokoku) No. 50-36459, an embossing ring having multiple protrusions on the outer peripheral surface extending in the film conveying direction is pressed against the film end before winding to press the film end in the film longitudinal direction. A method is disclosed in which extending and concavo-convex portions are continuously provided to prevent the film from being displaced in the width direction when the film is wound (or wound) into a roll shape. That is, when a part of the laminated and rolled film is displaced in the width direction, the convex strips and the concave strips of the film applied to the end portions mesh with each other to prevent the film from shifting. .

Further, Japanese Patent Publication No. 57-36129 discloses an embossing ring having stripe-shaped unevenness extending in the film transport direction. The embossing ring is pressed against the end of the film to mechanically roughen the film. , An apparatus for increasing the thickness of the film in that portion is disclosed.

[Problems to be Solved by the Invention] In both of the above two methods, the ridges or projections provided on the embossing ring extend in the circumferential direction of the embossing ring, that is, in the film transport direction. Although the uneven processing applied to the end portion effectively acts on the widthwise deviation of the film wound in a roll shape,
There remains a problem that the film does not necessarily work effectively against the deviation of the film in the winding direction such as winding tightness. The deviation of the film in the winding direction is caused by the winding tension of the roll-shaped film due to the winding tension, the winding shrinkage due to the shrinkage of the film itself, and the like. Undesirable charging of the roll film occurs due to relative movement between the films rubbing the films together. When the roll-up film is charged, it becomes difficult to handle the roll-up film and the secondary processing may be hindered. In addition, since winding normally does not occur uniformly, uneven charging occurs on the winding film,
If the unevenness becomes large, a quality problem occurs in some kind of secondary processing (for example, coating).

In addition to the above charging problem, the above-mentioned conventional method has the following problems.

That is, since the film end portions having the unevenness are stacked and wound up, that portion has a winding diameter larger (raised) than other portions when viewed in the film width direction. Then, in the above-mentioned conventional method, the convex shape attached to the film end is to be continuously linearly attached in the longitudinal direction of the film, and the portions with the convex stripes are laminated and wound at the same position. Therefore, there is a problem that the winding diameter difference from the other portion that has not been subjected to the treatment becomes considerably large, and wrinkles are likely to occur in the ridge portion or in the vicinity thereof. Wrinkles tend to occur especially on thin films with a weak stiffness. If the height of the embossing ring unevenness is made extremely small in order to suppress wrinkles, the effect of processing such as winding misalignment prevention diminishes. Conversely, if it is made high, wrinkles tend to occur. Sometimes you can't find it.

An object of the present invention is to suppress the deviation of the winding film in the winding direction, such as tightening, and to suppress the electrification of the winding film to be small.

Another object of the present invention is to optimize the conditions of the embossing ring so as to suppress the above charging and at the same time to positively prevent the wrinkle of the winding film from occurring.

[Means for Solving the Problems] The film winding method of the present invention which meets this object is a width of the film before winding when the continuously fed films are laminated and wound into a roll. In the vicinity of the end in the direction, a mechanical treatment is performed to deform the film at a position corresponding to the protrusion by pressing an embossing ring, in which a plurality of protrusion rows composed of a plurality of protrusions are arranged on the outer peripheral surface, to the film. The arrangement direction of the projections forming the projection row in the mechanical treatment is a line extending from the central portion side in the film width direction to the end portion at a right angle to the film transport direction, and the angle is 0 degree. It consists of setting the angle to the side in the range of 0 to 89 degrees.

A plurality of protrusions are intermittently arranged, and a plurality of protrusion rows are arranged. The pitch between the protrusions in the arrangement direction of the protrusions is preferably smaller than the pitch between the protrusion rows in the arrangement direction of the protrusions.

Further, the embossing rings having the above-mentioned row of protrusions are preferably provided on both sides in the film width direction, but may be provided on only one end portion. When it is provided on both sides, it is desirable that the arrangement direction of the protrusions is symmetrical.

Further, the height of the protrusion has an optimum range with respect to the target film thickness range. In other words, for thin films, if the height of the protrusions is made too high, the film may break due to the protrusions that are pressed into contact, so it cannot be made too high, and if it is made too low, the effect of treatment diminishes. , Need not be too low. In any case, it is preferable to finish the tip end surface of the protrusion into a flat surface having a certain area so that the tip end portion of the protrusion does not stick the film.

[Operation] In such a film winding method, since the array direction of the projections is set within a range of 89 degrees from the direction perpendicular to the film transport direction, the projection array is perpendicular to the film transport direction, that is, the film winding direction. It has a direction angle component. That is,
When the angle from a line extending at right angles to the film transport direction is θ degrees, the protrusion array has an angle component of cos θ. Since a plurality of the projection rows are intermittently arranged on the outer peripheral surface of the embossing ring, the convex portions in the corresponding array state are also intermittently processed in the film transport direction in the vicinity of the end portions of the film.
When the treated film is wound into a roll, the processed part and the unprocessed part are randomly laminated, and the convex part (processed part) of the film and the concave part (processed) of the film are processed. The part that is not covered) randomly engages in the winding direction. This meshing is cos θ in the direction perpendicular to the film transport direction, that is, the film winding direction.
Since this is the meshing of the intermittent row of protrusions and the portion between the row of convexes having the angle component of, the meshing effectively suppresses the deviation of the winding film in the winding direction, and the charging and uneven charging due to the deviation occur. Suppressed. Further, unlike the conventional method, the convex portions are not continuously laminated, so that the winding diameter of that portion does not become too large as compared with other portions, and the occurrence of wrinkles can be efficiently suppressed.

Further, θ is set in the range of 0 to 89 degrees, but when θ = 0 degrees, the angle component in the arrangement direction of the protrusions is only the component in the direction that suppresses the winding deviation, so that the winding film is wound. The deviation in the picking direction is most efficiently prevented. However, also in this case, since the projections themselves are arranged intermittently, the widthwise shift of the film is suppressed as in the conventional method.

When θ has a certain angle other than 0 degree in the backward direction in the film transport direction within the above range, the projection array causes the film to move in the end direction at the time of winding, depending on the angle component, as described later. Generate a pulling force. The action of this force causes the roll-up film to expand in the width direction and prevents wrinkles from forming in the roll-up film. That is, in this case, θ = 0
Wrinkles are positively suppressed as compared with the case of degree.

[Embodiment] A preferred embodiment of the present invention will be described below with reference to the drawings.

1 and 2 show a film winding method according to an embodiment of the present invention. In the figure, reference numeral 1 denotes a film which is continuously fed, and the film 1 is wound in a roll 3 on a winding shaft 2. Emboss ring at an appropriate position before this winding, for example, at the position immediately before winding.
4a and 4b are provided. In this embodiment, the embossing rings 4a and 4b are provided near both ends in the width direction of the film 1, but they may be provided on only one side. Rubber rollers 5a and 5b are provided so as to face the embossing rings 4a and 4b. By nipping the film 1 between them, the outer peripheral surfaces of the embossing rings 4a and 4b are pressed against the film 1.
The embossing rings 4a and 4b and the rubber rollers 5a and 5b are configured as free rolls in this embodiment, and the peripheral speed is naturally synchronized with the transport speed of the film 1 simply by nipping them. The pressing force of the embossing rings 4a, 4b against the rubber rollers 5a, 5b may be set appropriately according to the conditions such as the thickness of the film 1.

A plurality of protrusions 6 are arranged on the outer peripheral surface of the embossing rings 4a and 4b in a predetermined direction, and a plurality of rows of the protrusions 7 are further arranged in the circumferential direction of the embossing rings 4a and 4b. By pressing the embossing rings 4a and 4b against the film 1, a mechanical treatment for deforming the film 1 at a position corresponding to the protrusion 6 into a convex shape is performed. Therefore, the arrangement and pitch of the protrusions 6, and the arrangement angle and arrangement pitch of the protrusion rows 7 are transferred to the film 1 as they are, and the shapes of the protrusions 6 are transferred to the film 1 almost as they are. A plurality of convex portion rows 7a in which a plurality of convex portions 6a are arranged are intermittently formed as shown in FIG. The pitch a between the convex portions 6a and the pitch b between the convex portion rows 7a are respectively embossed rings.
It corresponds to the pitch between the projections 6 and the pitch between the projection rows 7 of 4a and 4b, but preferably has a relationship of a <b.

The arrangement direction of the protrusions 6, and therefore the arrangement direction of the convex portions 6a, is set as follows.

That is, when the line 8 extending at right angles to the film transport direction X from the central portion side to the end portion side in the film width direction is a line with an angle of 0, the arrangement direction of the projections 6 (projections 6a) is such that the film is rearward in the transport direction. The angle to the side is set within the range of 0 to 89 degrees. That is, 90 degrees, which is the angle in the conventional method, is not included. Further, a preferred range of this angle range is 45 to 89 degrees, and more preferably 60 to 89 degrees, in order to more effectively exert the wrinkle-stretching effect described later.

The shape of the protrusion 6 is the same as that of the film 1 transferred in FIG.
As shown in the convex portion 6a of FIG.
The protrusion 10 may have a truncated pyramid shape as shown in the figure showing another surface of the embossing ring 9, or may have another protrusion shape. It is preferable that the projections 6 and 10 have a vertical cross-sectional shape, as shown in FIG. The area of the tip surface 11 is too large when the film is made to have a convex shape when it is too wide.On the contrary, if it is too small, it may break through the film in a thin film, etc. Depending on the size, it will be set to an appropriate size. Also, the height H of the protrusions 6 and 10
The same can be said for. By the way, the thickness is 500μ
Suitable shapes of the protrusions 6 and 10 for the following film (preferably 6 μ to 25 μ) are, for example, a height H = 0.5 mm, a diameter of the base or a side W ₁ = 0.8 mm, a diameter of the tip surface 11 or a side W _2. = 0.2 mm
It is a degree.

Regarding the shape of the projection row 7, as shown in FIG. 5, two kinds of projection rows 13a and 13b of long and short may be alternately arranged on the outer peripheral surface of the embossing ring 12. 6
As shown in the figure, the rows of protrusions 14 are slightly displaced from each other.
The embossing ring 15 in which a and 14b are alternately arranged may be used. By doing so, the increase in the diameter of the roll-up film due to the film convex portion lamination, which will be described later, can be further alleviated.

Further, the projection row is not limited to the one extending in a straight line shape, and may be a piece 16 which is appropriately curved as shown in FIG.

Furthermore, the shape of the protrusions itself is not limited to the one having a regular shape as shown in FIG. 4, but as shown in FIG. It may be provided on the outer peripheral surface of the embossing ring 18 so that the extending direction of the band-shaped region 17 is at the above-mentioned predetermined angle θ.

The method of the present invention is carried out as follows using the apparatus configured as described above.

The description will be given for the apparatus shown in FIGS. 1 and 2 above.

Embossing ring 4a on film 1 sent continuously,
By continuously pressing the 4b, the convex portions 6a as shown in the figure are mechanically attached in the vicinity of both ends of the film 1. The film 1 that has been subjected to this mechanical treatment is wound into a roll 3 as it is. The convex portion row 7a is in the film transport direction X.
That is, since the films are intermittently arranged at an angle in the film winding direction, the convex portion rows 7a of the film 1 are randomly stacked on the winding roll 3. That is, the convex column
Although the pitch in the winding direction of 7a is constant, the diameter of the winding roll 3 gradually increases as the winding progresses, so that the position where the convex portion row 7a is rolled up gradually. Then, between the winding layers, the convex portion rows 7a or the convex portion rows 7a and the positions between the convex portion rows are randomly stacked. Therefore, in the winding roll 3 or on the surface of the winding roll 3, the convex portion rows 7a or the convex portion rows 7a and the positions between the convex portion rows randomly mesh with each other, but the convex portion row 7a has an angle of θ ( 0
.About.89 degrees) and has an angle component perpendicular to the film winding direction, the above meshing resists the displacement of the film in the film winding direction. As a result, due to this meshing, the deviation of the film in the winding direction is effectively suppressed,
Charging due to displacement is suppressed.

Further, in the above-described conventional winding method, the ridge was always laminated at the same position on the winding roll, but in the method of the present invention, the convex portion row 7a is randomly laminated as described above. Therefore, as compared with the conventional method, the allowance (local increase in winding diameter) of this portion can be suppressed to a small value. Therefore, the difference in winding diameter between this portion and other portions in the vicinity is suppressed to a small value, and the occurrence of wrinkles is suppressed.

Further, when the angle θ of the protrusion row 7a is other than 0 degree, the positive wrinkle-stretching effect as shown in FIG. 9 can be expected.

FIG. 9 shows the end portion of the film 1 on the surface of the winding roll, but when the convex portion row 7a advances in the winding position as shown by arrow A, it is fixed parallel to the winding shaft. As seen on the virtual line B drawn, the protrusion at the position of C is accompanied by the progress of winding,
It can be regarded as the same state as when the vehicle has advanced to the position of E as shown by arrow D. That is, when the line of sight is fixed on the take-up roll and observed, the projection row 7a always flows from the central portion side to the end portion side of the take-up roll 3, and due to this flow, the film 1 under the take-up tension is applied. Is positively extended to the widthwise end side, and wrinkles are extended. This wrinkle straightening effect is θ = 60
Especially noticeable at ~ 89 degrees.

Further, although the above explanation was made for the case other than θ = 0 degree,
As shown in FIG. 10, even in the projection row 19 when θ = 0 degree, all the actions other than the positive wrinkle-stretching action can be obtained. When θ = 0 degree, the angle component of the projection row 19 in the direction perpendicular to the film transport direction (winding direction) becomes the largest, and therefore the resistance against the film shift in the winding direction becomes the largest, and the winding shift occurs. Is effectively prevented.

[Effects of the Invention] As described above, according to the film winding method of the present invention, the arrangement direction of the protrusions of the embossing ring is specified as a direction different from that of the conventional method, and the convex portions of the film on the winding roll are Since the protrusions and the positions between the protrusions are randomly laminated, and the meshing due to the lamination can exert resistance against the deviation of the film in the film winding direction, the film roll is locally wound. It is possible to suppress the deviation of the film in the winding direction such as tightness of the winding while suppressing the increase of the diameter to prevent the generation of wrinkles. By preventing this shift, the charging of the winding film can be suppressed to a small level, and uneven charging can be suppressed.

Further, if the arrangement direction of the protrusions is specified in a more appropriate range, it is possible to positively give the film wrinkle-stretching effect to the film convex portion row at the time of winding, and it is possible to expect a further complete wrinkle prevention effect. it can.

[Brief description of drawings]

FIG. 1 is a perspective view of the vicinity of a film take-up roll showing an implementation state of a method according to an embodiment of the present invention, FIG. 2 is an enlarged plan view of a II portion of FIG. 1, and FIG. 3 is another embossing ring. Fig. 4 is a partial plan view of the surface of Fig. 4, Fig. 4 is an enlarged vertical sectional view of a protrusion of the embossing ring of Fig. 1 or 3, and Fig. 5 is a schematic partial perspective view of an embossing ring according to another embodiment. Is a schematic partial perspective view of an embossing ring according to yet another embodiment, FIG. 7 is a schematic partial perspective view of an embossing ring according to yet another embodiment, and FIG. 8 is a schematic view of an embossing ring according to yet another embodiment. Partial perspective view, FIG. 9 is a partial plan view of an end portion of the take-up roll of FIG. 1, and FIG. 10 is a perspective view of the vicinity of the film take-up roll showing a state of implementation of a method according to another embodiment different from FIG. Fig. 1 ... Film 2 ... Take-up shaft 3 ... Take-up roll 4a, 4b, 9, 12, 15, 18 ... Embossing ring 5a, 5b ... Rubber roller 6, 10 ... Protrusion 6a .... Convex portion of film 7 , 13a, 13b, 14a, 14b, 16, 17, 19 ... Projection row 7a ... Film convex section row 11 ... Projection tip surface X ... Film transport direction θ ... Angle of projection row or convex row

Claims (1)

[Claims] 1. When laminating continuously fed films and winding them into a roll, a plurality of projection rows consisting of a plurality of projections are formed on the outer peripheral surface near the widthwise end of the film before winding. By performing a mechanical treatment to deform the film at a position corresponding to the protrusion into a convex by pressing the arranged embossing ring to the film, the arrangement direction of the protrusions forming the protrusion row in the mechanical treatment, A line extending from the central portion side in the film width direction to the end portion at a right angle to the film transport direction is set to 0 degree, and the angle to the rear side in the film transport direction is set in the range of 0 to 89 degrees. Film winding method.