JP2002012348A - Film winding device and its winding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for winding a film, thin and less frictional with one face laying over the other when wound at a high speed, in good winding attitude without causing the disorder of winding. SOLUTION: A hole is provided in a collar portion of a collared touch guide roll which is thrust against a winding roll during winding the film. An air sucked between film layers is escaped via the collar portion while restricting the width.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for winding a long film such as a magnetic tape, an adhesive tape, a photographic film, and a paper. More specifically, the present invention relates to a flanged touch guide roll for winding a long film so as not to be disturbed.

[0002]

2. Description of the Related Art The technology of winding a long, thin tape is as follows.
It has been used in various industries that require large quantities, stability, low cost, small equipment, energy saving, and the like, and that require multiple steps. For example, industrial fields such as papermaking, printing, ink ribbons, photographic films, building materials, adhesive tapes, and magnetic tapes.

[0003] In the winding step, it is important that the winding is performed so that the winding shape is good and the winding is not disturbed, and the winding disorder leads to a process yield and quality. A roll that has been wound up without turbulence has a clean film edge and a flat roll side.However, if the roll is turbulent and the winding width widens, it cannot be loaded into the next process, and it may be necessary to rewind it again. The turbulent portion often has rubs, wrinkles, broken edges, and the like, and may need to be discarded in some cases. In order to take up the film without winding disorder, the width of the film guided to the take-up roll is regulated so as not to meander, and air is not caught between the film layers to prevent winding deviation. It has become necessary to cope with higher speeds and thinner films.

In the manufacturing process of a magnetic recording medium, not only a magnetic film but also a protective film and various functional films for stabilizing running and controlling wettability are coated on a base film or dried. , Surface treatment, cutting, etc., and each time, the film is unwound and wound up. Therefore, there is a demand for a winding method that maintains a high process yield and maintains film quality without a winding disorder. Japanese Patent Application Laid-Open No. Sho 62-31645 discloses that, as a conventional technique, at a position where a magnetic tape reaches a winding roll, a touch roll is pressed against the winding roll to simultaneously perform width regulation and prevention of air entrainment. Have been. In contrast to this prior art, the gazette discloses that, in order to cope with the enlargement of the take-up roll, the speeding up of the take-up, and the thinning of the film, a touch with low pressing force is applied at the position where the magnetic tape reaches the take-up roll. A roll is provided with a collar to regulate the width, and apart from this, a touch roll with a high pressing force for preventing air entrainment is provided downstream of this, and further,
When the take-up roll has a large diameter, a method in which an auxiliary edge regulating roll is provided at a position substantially opposed to the touch roll is adopted. In Japanese Unexamined Patent Publication No. 6-48623, a non-rotating guide block with a flange is provided in order to more reliably control the width, and downstream thereof, as in the above publication,
A method of providing a touch roll for preventing air from being entrained is disclosed.

However, each of these prior arts regulates a tape having a narrow width obtained by slitting a wide film. When winding the tape after the slit, it is required to wind the tape very accurately, and thus such a regulating method is adopted. However, when winding a wide film before slitting as in the present invention, such accuracy is not required, and the above-described regulation method is troublesome and can be said to be an economically effective means. Absent. However, it is difficult to obtain an acceptable degree of accuracy without any regulation, and thus a simple regulation method is required. Japanese Patent Application Laid-Open No. 5-1 / 1993 discloses a solution to such a demand.
There is a method using a guide roll having a spiral groove as disclosed in US Pat. However, when the width is regulated by the guide roll, when a thin film is wound up, a groove is transferred to the film, and the quality is significantly reduced.

[0006]

On the other hand, if the width is regulated while pressing the take-up roll by a method of simply attaching a flange to the touch roll having no groove, it tends to escape from between the films when the take-up is performed. Air is hindered by the flange of the touch guide roll, making it difficult to escape from both ends of the film.
Therefore, when trying to increase the productivity by increasing the winding speed, air that could not escape between the films formed air pockets and the film easily slipped, so the winding speed was increased and the film was wound. The film is meandering while being wound, and there is a problem that the ends are not aligned,
Air traps are formed between the layers of the film, and the film shifts during subsequent handling and transport.

In addition, as the density of the medium increases, the surface roughness tends to decrease, and the friction between the overlapping films decreases. Therefore, the present invention is a thin, low surface roughness, even in the high-speed winding of the film with a low friction between the film, at the same time as the width regulation using a touch guide roll with a flange, to prevent air entrainment, Provided are an apparatus and a winding method for winding a film at least with a member having no winding disturbance and good appearance.

[0008]

According to a first aspect of the present invention, there is provided a touch guide roll provided with a flange for pressing a film take-up roll, the flange being provided with a hole. Are overlapped.
An apparatus according to a second aspect of the present invention is characterized in that a notch is provided in a flange of the touch guide roll with a flange for pressing the film take-up roll, and the cut reaches the surface of the touch guide roll. In the apparatus according to the third aspect of the present invention, a groove is provided on the inner surface of the flange of the touch guide roll with a flange for pressing the film take-up roll, and the groove is formed radially or spirally from the surface of the touch guide roll to the outer periphery of the flange. It is characterized by being provided. According to a fourth aspect of the present invention, the touch guide roll having a flange is pressed against the film take-up roll, and the film is wound while air between the layers of the film is released through the flange. The device according to the fifth aspect of the present invention is the first aspect of the invention.
The flange of the touch guide roll described in 2 or 3 is made of a resin having a low frictional force. In the apparatus according to the sixth aspect of the present invention, the flange according to the first, second, third, or fifth aspect is movable in the cylindrical axis direction of the touch guide roll. In this way, the air entrained between the film layers is released from the roll end of the touch guide roll to the outside of the flange through a hole or notch provided in the flange, or to the outer periphery of the flange through a groove provided in the flange.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A specific configuration of the present invention will be described. As shown in FIGS. 1 and 2, the film 1 is wound on a winding roll 2. 3 is a touch guide roll body, 4
Is a flange, and 5 is a hole provided in the flange. The touch guide roll presses the take-up roll while in contact with the outermost peripheral film when being wound, and prevents air from being caught while suppressing fluttering of the film. Then, while controlling the width of the film by the flanges at both ends of the touch guide roll, the air layer wound between the film layers is released from the film end through holes formed in the flange.

[0010] width e ₂₂ of take-up roll core, since wider than both the width f, and flanged by touch roll of the flange interval e ₄ of the film, during winding start as shown in FIG. 8, a film wound Until the thickness tf becomes equal to or more than the width tu of the flange, the winding is started at a speed lower than a predetermined speed using the touch roll 8 having no flange. Then, after the edge of the collar no longer touches the winding roll core, the roll is replaced with a flanged touch guide roll and wound at a predetermined speed until the winding is completed.

The position where the touch guide roll contacts the take-up roll is preferably immediately after the film enters the take-up roll as shown in FIG. 9, but may be located downstream from the film as shown in FIG. It is determined in consideration of the arrangement and functions of the device around the take-up roll and its operability.

If the distance between the flange and the film edge is too narrow for the width regulation, when a large instantaneous meandering occurs, a large force acts to shift the film laterally, so that the film edge is larger than the winding side surface. It may jump out and get over the tsuba. In order to prevent overshoot, a minimum gap is required for lateral displacement until the force is reduced to a level that can be controlled by the flange, and the gap depends on the winding speed and the characteristics of the film. When the surface roughness is small and the friction between the overlapping films is lower, the force of the lateral displacement increases, so that adjustment such as increasing the interval is required.

For this reason, for example, as shown in FIG. 4, the flange is provided with a screwing portion so that the fixing portion to the touch guide roll main body can be moved and fixed at a desired position with a screw.
The structure is such that the distance from the film edge to the flange can be fine-tuned to the optimal position according to the type of film.

For example, when a film having a width of 1 m is wound at a speed of 400 m / min, a PET film having a thickness of 15 μm is used as a support and a magnetic layer is formed on one side and a back coat layer is formed on the other side. And high image quality V having a surface roughness Ra of 6 to 12 nm and 17 to 18 nm, respectively.
For HS films, the distance between the flange and the film edge is 3m
If it is not less than m, the protrusion of 10 mm or more does not easily occur, and if it is 5 mm or more, it does not easily occur. 10 intervals
If it is not less than mm, the width is not regulated even if the protrusion is lost, and the winding deviation increases. Therefore, if the distance between the flange and the film edge is 3 to 10 mm, the winding appearance is good,
There is little turbulence. More preferably, it is 5 to 10 mm. If it is less than 3 mm, the amount of jumping over the brim will be large,
Jumping out of 10 mm or more frequently occurs.

The touch guide roll body is cylindrical and its surface is made of rubber. Various rubbers such as natural rubbers, synthetic rubbers, and elastomers are used as the rubber, and details are described in "Notes on Utilization of Rubber / Elastomer" issued by the Industrial Research Council. Particularly from the viewpoint of wear resistance, urethane rubber,
Neoprene (registered trademark) rubber, fluorine-based rubber and the like are preferable. The hardness of the rubber used is between 40 and 60, in particular 4
Those in the range of 0 to 50 are preferred. If the hardness is less than 40, stickiness appears on the rubber surface and it is not suitable for winding the film, and if it is more than 60, it is difficult for air to escape.

The shape of the flange is not particularly limited as long as it prevents the film from meandering and does not hinder the running, but is preferably a disk shape. The material may be metal, but if the film is prevented from abrading the flange due to the end of the film and the adhesion of metal powder due to the shaving of the flange is eliminated, the quality near the film end will not be degraded due to this. It is even better to use a resin having a low coefficient of friction such as ethylene.

Here, as shown in FIG. 3, with respect to the center of rotation of the touch guide roll, the size of the hole extending from the surface of the touch guide roll toward the outer periphery of the flange is increased by the depth d of the hole in the rotation direction. The size is defined as the width w of the hole. The hole in the collar is
Since the air layer escapes from the film layer on the outer peripheral side of the take-up roll that has just been taken up with the touch guide roll, the surface of the touch guide roll is provided so as to be substantially a part of the contour of the hole. An effect can be obtained if the depth of the hole is about several times the thickness of the film to be wound. However, the depth is determined in consideration of ease of adjustment at the time of attaching the flange, subsequent maintenance, workability of the shape, and the like.

In the embodiment of the present invention, as shown in FIG. 3, a touch guide roll having a diameter of 80 mm is formed with a circular flange having an outer diameter of 100 mm.
Six semicircular holes with w of 4 mm are provided evenly in one flange. In a winding device provided with the touch guide roll with a flange, a base film having a thickness of 3 μm to 80 μm is used as a support, and a manufacturing process of a magnetic recording medium in which a coating film having a thickness of 0.01 μm to several μm is formed on one surface or both surfaces. Applicable.

By providing a hole in the flange of the touch guide roll, the running properties are stable, the appearance of the film is good, the winding is not disturbed, and the quality is not deteriorated by the winding.
A similar effect can be obtained by providing a notch in the flange as far as the touch guide roll surface as shown in FIG.
Alternatively, as shown in FIG. 7, a radial or spiral groove from the surface of the touch guide roll to the outer periphery of the flange is provided on the inner surface of the flange. If there is no hole in the flange of the touch guide roll, the air layer that has been entrapped cannot be released, and an air pocket is formed between the wound films,
It is easy to meander, the winding is poor, the productivity is low, and the yield is low. More details will be described below as Examples 1 to 8 and Comparative Example 1.

Table 1 shows the results of visually evaluating the roll appearance of the roll wound up in this manner, and evaluating two items of "winding deviation" and "protruding" and errors as a magnetic recording medium. Show. The “winding deviation” of the evaluation item refers to a defect in which the winding is shifted in the width direction due to continuous and periodic meandering, the winding side surface is wavy, and is not aligned. ○: when the winding deviation is within 10 mm, ×: when it is larger than 10 mm
And "Protrusion" refers to a winding defect in which a large meandering momentarily occurs in the width direction, one to several layers of film are shifted and wound, and jump out from the winding side surface. 10mm
Occurrence rate of rolls in which a larger protrusion occurred even at one place. Occurrence rate of less than 2% is ○, 2% or more and less than 5% is △,
5% or more is evaluated as x. The “end dropout” is a numerical value representing the quality of the tape at the end of the film when the wound film is slit into a specified width as a product, and is the number of dropouts of the electromagnetic recording. If there are no deposits or scratches, this value is small, indicating that the quality is good. If the number of tapes is 15 or less, the mark is ○; if the number is 16 to 20, the mark is Δ; if the number is 21 or more, the mark is ×.

[0021]

EXAMPLE The example is an example in which the present invention is applied to a videotape coating process. The base film used is a PET film, a magnetic recording layer on one side of the base, and a back coat on the other side. The layer is applied and passed through a drying oven before winding. The total length of the film is 12,000 m and the width is 1 m. The winding portion tension is 10 kg / width, the winding speed is 400 m / min, and the pressure of the touch guide roll is 50 kg / width. Details of the film to be wound up Base film thickness: 15 μm Magnetic recording layer thickness: 2 μm Magnetic recording layer surface roughness Ra: 6 to 12 nm Backcoat layer thickness: 0.5 μm Backcoat layer surface roughness Ra: 17 to 18 nm Base Young's modulus Vertical direction: 450-470kg / m
m Young's modulus of the base Lateral direction: 650 to 680 kg / m
m

The surface roughness Ra was measured using a surface roughness meter “TALYSTEP system” manufactured by Taylor Hobson.
This is performed based on JIS B0601. The measurement conditions were as follows: a stylus 0.1 μm × 2.5 μm was attached, weight 2 mgf,
Measurement speed 0.03mm / sec, filter 0.1
The measurement is performed at 8 to 9.0 Hz and a measurement length of 500 μm. The Young's modulus of a sample having a width of 12.65 mm was set to a distance between chucks of 200 mm using a tensile tester, the length was pulled by 1% (2 mm), and a load g at that time was obtained.
It is calculated by the following formula. The thickness T is measured with a micrometer beforehand. Young's modulus (kg / mm2) = g x 100 / (12.65 x
T) (mm)

In the first embodiment, a film is wound by using a touch guide roll provided with the above-mentioned hole in a metal flange with the distance from the film end to the flange set to 3 mm. In Example 2, winding is performed using the same touch guide roll as in Example 1, with the distance from the film end to the flange set to 5 mm. Example 3
Example 1 except that the collar was replaced by Teflon (registered trademark)
Using the same touch guide roll as described above, winding is performed with the distance from the film end to the flange set to 3 mm. Example 4
Using the same touch guide roll as in Example 3, the distance from the film end to the flange is set to 5 mm, and the film is wound. The fifth embodiment uses the same touch guide roll as the third embodiment,
Winding is performed with the distance from the film end to the flange set to 10 mm. In the sixth embodiment, instead of the holes of the fourth embodiment, winding is performed by replacing with a flange provided with a cut shown in FIG. Example 7
Instead of the hole of the fourth embodiment, the radial groove shown in FIG. 6 is replaced with a flange provided on the inner surface and wound. Example 8 is similar to Example 4
In place of the above hole, the spiral groove shown in FIG. 7 is replaced with a flange provided on the inner surface and wound. Comparative Example 1 is a touch guide roll having the same metal, the same size, and the same shape as that of Example 1 but having the same shape as that of Example 1, but having a flange without a hole. The distance from the film edge to the flange is set to 5 mm. Roll up.

As is clear from Table 1, Examples 1 to 5
When the film is wound by a touch guide roll with a flange provided with a hole in the flange as described above, there is no deviation in winding, and the pop-out occurrence rate is low. Further, the same effect as that of providing a hole can be obtained even if a notch is provided in the flange as in the sixth embodiment or a groove is provided in the inner surface of the flange as in the seventh and eighth embodiments. Examples 2 and 4
And the distance from the film edge to the flange is 5m as in 5
When the distance is set to m or 10 mm, the pop-out occurrence rate is reduced and a remarkable effect is obtained. When the material of the flange is a resin having a small friction coefficient as in Examples 3, 4, and 5, the dropout at the film edge is smaller. On the other hand, in the case of the conventional flange having no hole as in Comparative Example 1, winding deviation occurs and the pop-out occurrence rate is high.

Therefore, as in the present invention, when the film is wound by providing a hole or a cut in the flange of the touch guide roll used for winding the film or by providing a groove on the inner surface, the winding is disturbed even when the film is wound at a high speed. In this case, if the flange is made of a resin having a low friction coefficient, it is more effective to reduce the shaving of the flange due to the end of the film and a decrease in quality.

[Table 1]

[0026]

As described above, when the film is wound by the winding device in which the flange of the touch guide roll used for winding the film is provided with holes, cuts, or grooves on the inner surface, the film can be wound at a high speed. There is no turbulence and productivity can be increased while maintaining quality.

[Brief description of the drawings]

FIG. 1 is a side view of winding a film using a touch guide roll with a flange of the present invention.

FIG. 2 is a diagram illustrating a relationship between the width of a touch guide roll with a flange and a take-up roll of the present invention.

FIG. 3 shows a shape of a flange provided with a hole used in Examples 1 to 5.

FIG. 4 is an embodiment of a touch guide roll with a collar according to claim 6;

FIG. 5 shows the shape of a collar provided with a cut.

FIG. 6 shows the shape of a flange in which grooves are radially provided on the inner surface.

FIG. 7 shows the shape of a collar provided with a spiral groove on the inner surface.

FIG. 8 is a diagram illustrating a state in which a touch roll having no collar presses a take-up roll at the start of film winding.

FIG. 9 shows a preferred arrangement of the flanged touch guide roll of the present invention.

[Explanation of symbols]

1: film 2: winding roll 3: touch guide roll with flange 4: flange 5: hole provided in flange 6: touch guide roll body 7: film end 8: touch roll without flange b: from film end to flange Interval d: depth of hole w: width of hole tf: thickness of wound film tu: width of flange 11: screw 13: touch guide roll surface position 14: cut provided on flange 15: inner surface of flange provided grooves 22: take-up roll core e _22: width of the take-up roll core e4: flange interval f: the width of the film

Claims (6)

[Claims] 1. A film winding device, wherein a hole is provided in a flange of a touch guide roll provided with a flange for pressing the film winding roll, and the hole overlaps a part of the surface of the touch guide roll. 2. A film winding device, wherein a cut is provided in a flange of a touch guide roll with a flange for pressing a film take-up roll, and the cut reaches the surface of the touch guide roll. 3. A groove is provided on the inner surface of the flange of the touch guide roll with a flange for pressing the film take-up roll, and the groove is provided radially or spirally from a part of the surface of the touch guide roll to the outer periphery of the flange. A film winding device, comprising: 4. A method for winding a film, wherein a touch guide roll having a flange is pressed against the film winding roll, and the film is wound while air between layers of the film is released through the flange. 5. The film winding device according to claim 1, wherein the flange of the touch guide roll is made of a resin having a low coefficient of friction. 6. The film winding device according to claim 1, wherein the flange is movable in the cylindrical axis direction of the touch guide roll.