JPH08225199A - Winding device and winding method for plastic film - Google Patents

Abstract

PURPOSE: To eliminate longitudinal wrinkles and lateral wrinkles so as to improve a winding shape by lifting both lug parts of a film in the outermost wound layer on a winding roll from the winding roll in the position which is situated in the just upstream of a contact pressure roller and corresponds to both lug parts of the film to be wound. CONSTITUTION: In a contact pressure roller 2, soft rubber, plastic resin, or the like is wound on a surface 21, and a lifting device 40 is arranged in the position which is situated in the just upstream of the pressure roller 2 and corresponds to both lug parts of the outermost wound layer 12 of a plastic film 10 made of polyethylene terephthalate, polypropylene, or the like to be wound on a winding roll 4. By means of the lifting device 40, both lug parts of the plastic film 10 in the outermost wound layer 11 on the winding roll 3 is lifted from the winding roll 3. In this way, winding up of wrinkles in the plastic film 10 or generation of longitudinal wrinkles and the like in the inside is prevented, so that the plastic film 10 can be wound up into a good winding shape.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a winding device and a winding method for a plastic film. More specifically, the present invention relates to an improved plastic film winding device and winding method capable of winding a thin and wide plastic film at a high winding speed without causing defects such as wrinkles. .

[0002]

2. Description of the Related Art Among plastic films, polyethylene terephthalate, polyethylene-2,6-naphthalate, polypropylene, polystyrene, polyphenylene sulfide, aramid, etc., which are highly functional plastics in terms of mechanical properties, thermal properties, electrical properties, etc. The film based on is for magnetic tape,
It is often used for capacitors, thermal transfer ribbons, and stencil printing. Furthermore, in these applications, with the development of ultra-thin film thickness technology, plastic films with a thickness of several μm to submicron are produced.
It's being used.

In general, these plastic films are continuously produced in a wide width in a film forming process, wound into a roll shape, and then slit into a width and a length suitable for processing by a processing machine and supplied. Coating, printing,
It is processed by a method such as vapor deposition and sputtering. This wide take-up roll can be folded, vertically wrinkled, horizontally wrinkled, when wound at high speed or when the winding length is increased.
Winding defects may occur due to static electricity, but especially in recent years, the thinning of plastic films and the progress of ultra-smoothness have progressed, and it has been possible to improve the winding defects of wide winding rolls that are continuously wound during film formation. It is being advanced.

[0004]

In view of the above problems, the inventors of the present invention have earnestly studied to improve the winding defect of a wide winding roll, and arrived at the present invention.

That is, the object of the present invention is to improve the winding defect of the wide take-up roll continuously wound in the film formation due to folds, vertical wrinkles, horizontal wrinkles, static electricity and the like. It is a thing. In particular, at the winding opening where the plastic film is wound up in a roll, the contacting roller that comes into contact with the winding roll and applies a surface pressure removes the air entrained at the same time as the winding, but the plastic film is wound up. After being wound up, the contact pressure roller repeatedly receives the surface pressure, so that the defects in the winding form such as vertical wrinkles and horizontal wrinkles caused by the gradual release of the air trapped between the layers of the film are improved. That is the purpose. Further, the present invention is such that the air layer confined between the outermost film winding layers is pinched by the pressure roller, and the creases and wrinkles that occur when the air layer passes between the pressure roller and the plastic film roll. It also aims to improve static electricity unevenness.

[0006]

SUMMARY OF THE INVENTION A plastic film winding device of the present invention which meets the above object is a device for winding a plastic film into a roll by using a contact pressure roller for applying a surface pressure. At a position on the upstream side of the contact roller as viewed in the direction of rotation of the take-up roll, and at a position corresponding to both ears of the film to be wound, both ears of the film in the outermost winding layer of the take-up roll, It is characterized in that it is provided with means for levitating from the winding roll.

That is, in winding a plastic film which is wound using a contact roller for applying a surface pressure,
After the plastic film is wound into a roll and before reaching the position of the contact pressure roller that applies the surface pressure again, the both ends of the wound film are floated from the take-up roll and wound. Is a winding device for
More preferably, it is a plastic film winding device that winds both ears of the film from both sides of the winding roll while pulling them toward both outer sides in the axial direction of the winding roll.

Further, the method of winding the plastic film according to the present invention is a method of winding the surface pressure of the plastic film into a roll by using a contact pressure roller, wherein the contact pressure is viewed in the direction of rotation of the winding roll of the plastic film. At a position immediately upstream of the roller, and at a position corresponding to both ears of the film to be wound, both ears of the film in the outermost winding layer of the winding roll are floated from the winding roll. How to do it.

In the above-mentioned winding device, as the means for floating the film ears, for example, a means provided with a rotatable belt having suction holes, or a means having a suction box and two or more free rotation rollers is used. Become.

In these means, it is preferable that the belt winding direction or the rotation direction of the free rotating roller is directed outward by 1 to 45 ° with respect to the film winding direction.

Further, the above-mentioned apparatus has means for detecting the outermost diameter of the plastic film take-up roll being taken up, and based on a signal from the detecting means, the film ear portion by means for floating the film. It is preferable that the floating position of is determined. It is desirable that the floating position is set to a value equal to or larger than the film thickness, within the elastic range of the film, and a position where the film is floated. As a means for detecting the outermost diameter of the winding roll, a non-contact means using light or ultrasonic waves can be applied.

Further, the film winding roll is wound while oscillating in the axial direction,
The winding appearance is further improved.

In the winding method, the winding roll wound by the film floating treatment is slit using two or more cutters, and at least the ear portion subjected to the floating treatment is included. The part that does not exist is considered as the product.

The thickness of this plastic film is 25 μ
m or less, effective width after winding (effective width that can be commercialized) is 2 m
As described above, when the hardness of the surface layer of the winding roll is 88 ° Shore or more, the effect of the present invention becomes remarkable.

The present invention will be described in detail below with reference to the drawings. 1 and 2 show a winding device for a plastic film according to an embodiment of the present invention.
The plastic film 10 used in the present invention is
Polyethylene terephthalate, polyethylene-2,6-
2 such as naphthalate, polypropylene, polystyrene, polyphenylene sulfide, polyamide, aramid
A plastic film formed by axially stretching and then heat-fixing, both ears produced during the film formation process were removed, and the thickness was 25 μm.
The following plastic film. Further, the film take-up roll 3 wound according to the present invention is taken up by the contact roller 2 for free rotation on the winding core 5 for applying a surface pressure while eliminating the air taken in between the film winding layers. . The contact roller 2 has a surface 21 wound with a soft rubber or a plastic resin, and is capable of uniformly applying surface pressure. The device 40 for floating the plastic film 10 from the take-up roll 3 is installed on the take-up roll 3 and on the winding side in the rotation direction of the contact roller 2 that applies surface pressure. That is, it is a position immediately upstream of the contact roller 3 as viewed in the rotation direction of the winding roll 3. The levitation device 40 is provided at a position corresponding to both ears of the film to be wound up.

Here, the film 11 on the take-up roll 3 is
The film is wound around the winding port A and rotated almost once, and the film 12 is wound around one more rotation. Further, the levitation device 40 is provided with a belt 42 having a suction hole 60 and which can freely rotate, as shown in FIGS. Alternatively, it comprises a device having a suction box 46 and two or more free rotation rollers 47 as shown in FIGS. The direction in which the belt 42 travels freely or the direction in which the roller 47 rotates freely is set outward by an angle θ with respect to the winding direction of the plastic film.

The levitation device 40 has a suction box 41 or 46, and exhausts air from an exhaust hole 45 or 49 using a blower (not shown). The belt 42 is formed by forming a thin metal plate or a flexible thin plastic or rubber band into a cylindrical shape, and using rollers 43, 43 'to form the shaft 4 thereof.
It is rotatably supported by 4, 44 '. A through hole 60 (suction hole) is formed on the entire surface of the belt 42, and air is sucked through the hole 10. It is preferable that the belt 42 has a smooth surface and is subjected to polishing processing or sliding processing so that it slides well with the plastic film. For polishing,
The effect is enhanced by finishing to a suitable surface roughness, for example, 1 s to 5 s, but this is not the only option. In the case of slip treatment, it is advisable to coat the surface with Teflon or ceramic. It is more preferable to finish by polishing after that. Also, the slip may be improved by a treatment such as impregnation with another oil or a chemical solution.

When two or more rollers 47 are used, they are rotatably supported by a shaft 48. Since these rollers are arranged close to each other, they can be sucked through the gap. It is preferable to apply a slip treatment to the surface of these rollers, because the effect is enhanced. Here, the film 11 is the through hole 60 of the belt 42 or the roller 4
It is sucked from between 7 and comes into close contact with the belt 42 or the roller 47. By the suction of the film 11, the outermost film 11 is floated, and a space is formed between the film 11 and the lower film 12.

At this time, the position of the surface of the film 11 which has been floated is further controlled. For this control, the phototube type sensors 61 and 61 'and the ultrasonic type sensor 62 are used to detect the outer circumferential position (winding diameter) of the winding roll, and the levitation device 40 is detected according to the change in the winding diameter.
Are evacuated. A signal from the winding diameter detecting means is fed back to the retracting device (not shown) to control the position. These sensors may work together with the retracting device of the contact pressure roller 2 that applies the surface pressure, or may be a device that detects the position of the contact pressure roller 2 that applies the surface pressure. The floating amount is preferably at least the thickness of the film and within the elastic range of the film.

Further, in this levitation apparatus, the angle .theta. With respect to the direction in which the product roll is wound is 1 to 45.degree. Outward, and the film is floated while being pulled outside the take-up roll 3 and wound up.

The plastic film wound up in this way is further improved in winding shape by appropriately oscillating in the winding axis direction. In this oscillation, it is preferable to reciprocate approximately 50 to 300 mm in a cycle of 0.5 to 5 minutes.

Further, in the winding roll 3, the effective width 80 of the product is 2 m or more in the subsequent slitting process, except that the ears that are floated up at least when the winding roll having a wide width is obtained are not slit. Yes, the hardness of the surface layer is 88 °
It is preferable to wind it over the shore.

[0023]

With the floating device, both ears of the film 11 are floated from the take-up roll 3 and are wound inside the film 11, and the trapped air can be quickly discharged. In the conventional device, the air layer at the position where the contact roller 2 and the take-up roll 3 nip is compressed by the roller 2 and the take-up roll 3 as shown in FIG. When a part of the air 53 in the receiver passes between the roll 3 and the roller 2, the film 1
Although creases and static electricity were sometimes generated between Nos. 1 and 12, the occurrence of these defects is suppressed by promptly discharging the air layer 50 from the point B (that is, the film ear portion in the present invention). be able to. Further, by winding the plastic film while pulling it toward the outside of the winding roll 3, it is possible to suppress the generation of wrinkles and the like that occur after the air is discharged.

[0024]

EXAMPLES The present invention will be described in more detail with reference to specific examples. The method for evaluating the winding shape used in the present invention was as follows. (1) Appearance defect As the appearance of the winding of the wide take-up roll, the appearance of wrinkles and the presence of static electricity marks are visually inspected from the surface layer. Judgment was made as follows: No defect: ◯, and defect: x.

(2) Defects in the inner layer of winding The product which is slit by a wide winding roll is disassembled to examine the defects of the inner layer. The inner layer defects were checked for creases, vertical creases, and horizontal creases, and were judged as follows. No defect: ○ There is a defect that disappears with finger tension: △, There is a defect that does not disappear with finger tension: ×

(3) Winding hardness According to JIS-C6301, a C-type hardness tester is used for films of 7 μm or more, and A is used for films of less than 7 μm.
The surface of the winding roll was measured at 10 points or more at equal intervals in the lateral direction (roll axis direction) with a mold hardness meter, and the average value was taken.

Examples 1 to 3 As a plastic film, a polyethylene terephthalate film having a thickness of 13 μm and a surface roughness Ra of 10 nm was produced by biaxially stretching and heat setting. After that, both ears were cut into a film having a width of 5.5 m before entering the wide winding. After that, a contact pressure roller that is wound around an aluminum core having an outer diameter of 350 mm as a winding core and is wound with chloroprene rubber having an outer diameter of 280 mm and a rubber hardness of 55 ° Shore in a thickness of 20 mm is used. Applied surface pressure. Air cylinder 7 so that the surface pressure is 70 kg / m
An air pressure of 0 (Fig. 2) was adjusted. On the other hand, as a device for floating the film, a width of 150 mm and a cylinder diameter of 100 mm,
Roll a stainless steel belt with a thickness of 0.2 mm 43, 4
I hung it on 3 '. Holes having a diameter of 2 mm were formed on the surface of this belt at a pitch of about 5 mm to form suction holes. The surface of this belt was thinly coated with Teflon to improve the slip. Further, suction was performed through a suction hole using a blower (not shown). The running angle θ of the belt at this time was set to about 5 °, and the gap between the film 11 and the film 12 was opened by 1 mm. Photoelectric tubes 61 and 61 'were used to detect the outermost circumference of the rolled product roll, and this was fed back to a retracting device (not shown).
The winding tension is 12 to 14 kg / m, and the winding motor 71
(Fig. 2). Winding speed from 200m / min to 40
It was changed to 0 m / min, and wound up by 30,000 m for each. Then, slitting was performed on both ears by 250 mm each, and 10 products each having a width of 1000 mm and a length of 15000 m were wound up at a slit speed of 500 m / min. Table 1 shows the results of determining the winding state of the intermediate winding product based on the appearance of the product and the wrinkle state of the inner layer.

Comparative Examples 1 and 2 The same film as that used in Examples 1 to 3 is wound up without using a device for floating the film and the winding state of the intermediate product from the slit product is shown in Table 1. Under this condition, the slit speed is 30 due to the winding failure of the rolled product.
The limit was 0 m / min. Further, the winding hardness was softer than that of the example, and vertical wrinkles were observed in the inner layer.

Examples 4 to 7 As a plastic film, a polyethylene terephthalate film having a thickness of 1.2 μm and a surface roughness Ra of 25 nm was produced by biaxially stretching and heat setting. After that, both ears were cut into a film having a width of 2.5 m before winding. After this, as a winding core, it was wound around an FRP core having an outer diameter of 150 mm, and chloroprene rubber having an outer diameter of 150 mm and a rubber hardness of 50 ° was wound on the surface with a thickness of 10 mm. The surface pressure was applied. Air cylinder 70 so that the surface pressure is 35 kg / m
I adjusted the air pressure. On the other hand, as a device for floating the film, seven freely rotating rollers each having a width of 120 mm and a diameter of 10 mm were arranged at a pitch of 15 mm according to the R (radius of curvature) of the winding core. The surface of this roller was thinly coated with Teflon to improve the slip. Further, it was sucked from the gap between the rolls by using a blower (not shown). The rotation direction θ of the roller at this time is about 30 °,
The position of the contact roller was detected by ultrasonic waves at the outermost circumference, and the distance between the film 11 and the film 12 was set to be 2 mm (Examples 4, 5, and 6). Further, the winder and the pressure roller were integrated with each other and laterally oscillated with a width of 200 mm at a cycle of 3 minutes (Example 7). In each case, the winding tension is 3 to 4
The winding speed is 100 m / min to 300 m / min.
It changed to the minute and wound up with a length of 100,000 m. Furthermore, in the slit, remove both ears by 250 mm and
12 at a speed of 200 m / min for each 30,000 m in 0 mm width
I wound up the book. From the appearance of the product and the wrinkled state of the inner layer, the winding state of the wide product is shown in Table 2.

Comparative Examples 3 to 5 Table 2 shows the winding appearance of the product when the same film as that used in Examples 4 to 7 was wound without using a device for floating the film. Traces of static electricity and vertical wrinkles were also found on the inner layer (Comparative Example 4). Although only the oscillation was the same as that of the example, the static electricity mark did not disappear even when the winding speed was lowered to 170 m / min (Comparative example 5).

[0031]

[Table 1]

[0032]

[Table 2]

[0033]

According to the present invention, a wide-width plastic film can be wound into a good winding form without wrinkles or other wrinkles and no internal vertical wrinkles. You can wind it up with.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a winding device according to an embodiment of the present invention.

2 is a plan view of the device of FIG. 1. FIG.

FIG. 3 is a schematic vertical cross-sectional view of a film floating device according to an embodiment of the present invention.

FIG. 4 is a bottom view of the device of FIG.

FIG. 5 is a schematic vertical sectional view of a film floating device according to another embodiment of the present invention.

FIG. 6 is a bottom view of the device of FIG.

FIG. 7 is a schematic configuration diagram of a conventional winding unit having no film floating device.

[Explanation of symbols]

 2 Contact roller 3 Winding roll 10 Plastic film 11 Film of the outermost winding layer 12 Film wound one round before 40 Floating device 41, 46 Suction box 42 Belt 43, 43 'Belt support roller 47 Two or more provided Roller 60 Suction holes 61, 61 ', 62 Winding roll winding diameter detecting means 80 Film effective width A Winding mouth B Film ears

Claims (11)

[Claims] 1. A device for winding a plastic film into a roll by using a contact pressure roller for applying a surface pressure, at a position immediately upstream of the contact pressure roller as viewed in the direction of rotation of the plastic film winding roll, and , A means for raising both ears of the film in the outermost winding layer of the take-up roll from the take-up roll at positions corresponding to the two ears of the take-up film, Take-up device. 2. The winding apparatus for a plastic film according to claim 1, wherein the means is a means for floating both ears of the film from the winding roll and pulling the ears toward both outer sides in the axial direction of the winding roll. . 3. The winding apparatus for a plastic film according to claim 1, wherein the means comprises a means having a belt which has a suction hole and is rotatable. 4. The winding apparatus for a plastic film according to claim 1, wherein the means comprises a suction box and a means having two or more free rotating rollers. 5. The winding of the plastic film according to claim 3 or 4, wherein the winding direction of the belt or the rotation direction of the free-rotating roller is 1 to 45 ° outward with respect to the winding direction of the plastic film. apparatus. 6. The method according to claim 1, further comprising winding diameter detection means for the plastic film winding roll being wound, and the floating position of the plastic film by the floating means is determined based on a signal from the detection means. 5. The plastic film winding device according to any one of 5 above. 7. The winding apparatus for a plastic film according to claim 6, wherein the winding diameter detecting means of the winding roll comprises means using light or ultrasonic waves. 8. The winding roll of the plastic film is oscillated in the winding axis direction.
8. A winding device for a plastic film according to any one of 1 to 7. 9. A method of winding a surface pressure into a roll by using a contact pressure roller, wherein the plastic film is wound at a position immediately upstream of the pressure roller as viewed in the rotational direction of the winding roll of the plastic film, and A method of winding a plastic film, characterized in that both ears of the film in the outermost winding layer of the take-up roll are floated from the take-up roll at positions corresponding to both ears of the film to be taken. 10. The method of winding a plastic film according to claim 9, wherein a wide winding roll is slit using two or more cutters, and at least a portion which does not include the ears subjected to the floating treatment is a product. . 11. The thickness of the plastic film is 25 μm.
The m is m or less, and at least the ears that have been subjected to the floating treatment are not included after winding, the productable effective width is 2 m or more, and the hardness of the surface layer of the winding roll is 88 ° Shore or more. 10. The method of winding the plastic film of 10.