JP2002179822A - Film roll form and method for producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a film roll form having high film-film contact firmness, especially excellent as an original film for vapor deposition because of no film- film slippage when subjected to vacuum suction on a vapor deposition machine, thus suitably usable in wide applications including magnetic tapes, packaging materials and capacitors. SOLUTION: This film roll form is so designed that at least part of the transverse direction of the film wound in the form of a roll is provided with electrification-treated portion(s) <10 mm in the difference between the maximum width and minimum width. Thus, this film roll simultaneously realizes high film-film slippage proofness and deaeration via the end portions, causes the edge face not to get out of place and is free from wrinkles, deformations, eccentricities, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film roll obtained by winding a film used for, for example, a magnetic tape or a packaging material into a roll, and a method of manufacturing the film roll.

[0002]

2. Description of the Related Art When winding a film on a roll, it has been conventionally known that a surface treatment is performed on a part of the film in the width direction in order to prevent the end face of the film from shifting and meandering. This surface treatment includes embossing,
For example, formation of a stripe-shaped convex portion, charging treatment and the like are exemplified. These surface treatments increase the coefficient of friction between the films,
The adhesion between the films is increased, and the film can be prevented from shifting and meandering.

[0003] Among these surface treatments, the charging treatment method is as follows.
For example, it is disclosed in Japanese Patent Application Laid-Open No. 9-202496. Japanese Patent Application Laid-Open No. Hei 9-202496 discloses that a film is charged by bringing a discharge electrode into contact with or close to the other surface of a film in which one surface is in close contact with a portion of a ground conductive roller, and then charging the film. It is disclosed that both surfaces of the film are charged by peeling off from the ground conductive roller surface.

However, according to the invention described in Japanese Patent Application Laid-Open No. 9-202496, the air trapped between the film layers when the film is wound up in a roll form due to the close contact of the charging section to prevent the winding deviation. However, escape from the end of the film is prevented, which causes eccentricity and wrinkles during rotation of the film roll body.

[0005] In particular, when processing is performed by a vacuum process such as when depositing a film roll body, the air caught between the film layers escapes at a stretch during the evacuation step in the vacuum machine, so that the end face of the film roll body becomes large. A problem arises in that the film shifts and the film is meandering left and right when the film is unwound from the film roll inside the vapor deposition machine. For this reason, a film roll processed by a vacuum process, particularly a film roll for vacuum deposition processed at a high vacuum, has a strong adhesion force, and furthermore, moderately escapes the accompanying air between the layers of the film roll while winding it. There has been a demand for a charging method capable of performing the charging.

On the other hand, Japanese Patent Laid-Open Publication No. Sho 51-71351 discloses a method for securing an escape route for air from the end of a film roll by applying a surface treatment such as charging or hot air in synchronization with the rotation of the film roll. There is disclosed a technique of forming the film intermittently in the longitudinal direction.

FIG. 4 shows a technique described in Japanese Patent Application Laid-Open No. 51-71351. As shown in FIG.
Is wound up as a film roll 1, the film 4 is intermittently charged by the needle electrode 7 connected to the high-voltage power supply 9. The rotation speed of the film roll 1 is detected by the rotation speed detector 15 of the film roll 1, and the control device 12 controls the high voltage output / stop of the high voltage power supply 9 in synchronization with the rotation of the roll.

However, in this method, since the surface treatment by the charging treatment is performed in synchronization with the rotation of the take-up roll, the control device 12 becomes complicated and expensive. Furthermore, in particular, since the application cycle of the high voltage is changed as the winding diameter of the film roll increases, the switching of the high voltage circuit is required, and the system is complicated, and the high voltage switching section is easily damaged.

Further, since a voltage is intermittently applied to the needle-shaped electrode 7, dust adheres to the needle-shaped electrode, solidifies, and the needle tip is remarkably oxidized, requiring much labor for maintenance.
The discharge state changes with time due to the change of the tip shape due to corrosion, and as a result, control becomes difficult.

In addition, since each layer of the film is in close contact at a specific position in the circumferential direction of the film roll, when the winding diameter is large, a distribution difference of air occurs in the circumferential direction, and the film roll form is disturbed. Specifically, as shown in FIG. 4, unevenness in hardness of the film roll occurs between the contact portion 16 and the non-contact portion 17 of the film, and the film roll is wound in a polygonal shape. This causes a change in tension and causes tears and wrinkles.

As described above, the conventional surface treatment technique is not sufficient as a technique for preventing the winding deviation of the film roll.

[0012]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned drawbacks of the prior art, to effectively prevent the end face from being displaced by a small number of charge processing sections, to reduce the occurrence of problems such as tearing, and to reduce eccentricity. Provided are a film roll body having no problems such as wrinkles and roll deformation, and a method for manufacturing a film roll body which is inexpensive and has good stability.

[0013]

The structure of the present invention for solving the above problems is as follows.

The film roll body of the present invention is characterized in that at least a part in the width direction of the film wound in a roll shape has a charging section in which a difference between a maximum width and a minimum width is within 10 mm.

In the film roll of the present invention, preferably, the charging section is intermittently present at a predetermined period in the longitudinal direction of the film, and the ratio of the charging section is one cycle in the longitudinal direction. 10 to 80% of the area, the width of the charging section is 2
It is characterized by being within 0 mm.

The method for producing a film roll of the present invention comprises:
It is characterized in that the charging process is performed intermittently at a predetermined cycle in the longitudinal direction of the film, and the time ratio of performing the charging process in one cycle is 10 to 80%.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

The film roll body of the present invention has, at least in a part of the width direction of the film wound in a roll shape, a charging section in which a difference between a maximum width and a minimum width is within 10 mm.

As a result of the study, the inventors have found that the conventional charging method as described above not only causes unevenness in the charging process itself, but also when the film is wound into a film roll, Since the charged portions are continuously laminated at the same position, the potential of this portion is significantly increased, and as shown in FIG.
Was found, causing the width of the charging section to fluctuate.

The difference between the maximum width and the minimum width of the charging section is 10 m.
If it exceeds m, it is not possible to simultaneously realize strong displacement prevention and air escape from the end. By setting the difference between the maximum width and the minimum width of the charging unit to be within 10 mm, it is possible to effectively prevent the end face deviation of the film roll body, and to prevent the eccentricity, wrinkling, and deformation of the roll body. .

FIG. 1 shows an embodiment of the film roll of the present invention, and FIG. 2 shows an embodiment of the film of the present invention. The charging section 2 of the film roll 1 is provided to prevent displacement. The difference between the maximum width Y and the minimum width X of the charging section 2 is within 10 mm. Here, the width of the charging section is the length of the charging section in a direction perpendicular to the longitudinal direction of the film. When the length of the charged portion is 1 m or more, the width of the charged portion is checked over an arbitrary length of 1 m in the longitudinal direction of the film, and the difference between the case where the maximum width is Y and the minimum width is X is shown. Ask for. If the length of the charged portion is less than 1 m, a difference between the maximum width and the minimum width between the charged portions in one cycle is obtained.

The width and state of the charging section can be confirmed by visualizing the charging section by sprinkling a powder or a liquid in close contact with a charged portion such as a toner used in a printer or a copier onto a film. it can.

Further, a film is placed on a conductive plate,
By sprinkling toner and sky pollen from above, a portion strongly charged by the charging process can be clearly visualized and discriminated.

When the toner adheres to other parts than the charging processing part, the charging processing part and the non-charging processing part can be determined by the amount of toner adhered, and the boundary between the charging processing part and the non-charging processing part should be confirmed. Can be. The maximum width, the minimum width, and the period in the length direction of the charging section can be measured using this boundary as a mark.

In the present invention, it is preferable that the charging section is intermittently provided at a predetermined period in the longitudinal direction of the film.

In the present invention, it is preferable that the ratio of the charge-treated portion is 10 to 80% in one cycle in the longitudinal direction.

The ratio of the charged portion 2 of the film 4 in one cycle is obtained by dividing the length E of the charged portion by the period S, as shown in FIG. When the film is wound up, the charging process is performed intermittently at a predetermined cycle, and the charging time of the charging process within one cycle is 10 to 80%. The percentage of parts
It becomes 10 to 80% in the longitudinal direction.

If the length E of one cycle is smaller than the circumferential length of the film roll, and if the total length of the film is sufficiently large with respect to the cycle, the probability that the charged portions overlap each other on the average in the entire film roll body occupies one cycle. The ratio is almost the same as the ratio of the charging section, and the upper and lower layers adjacent to each other on the film roll are overlapped at a ratio of approximately 10 to 80% in the winding direction.

When the proportion of the charged portion is less than 10%, the portion where the charged portion overlaps becomes too small,
In some cases, the effect of preventing the displacement is lost.
Conversely, if the proportion of the charged portion exceeds 80%, the charged portions almost overlap, and even if displacement can be prevented,
In some cases, air does not escape and the foam of the film roll body is disturbed, or unnecessary discharge is caused in the non-charged portion due to the lamination of the charged portions.

In the present invention, the ratio of the charging section is more preferably 40 to 60% in one cycle in the longitudinal direction, and most preferably 50% in one cycle. When the ratio of the charge processing section is 40 to 60% in one cycle, the effect of air release and the effect of preventing displacement are most balanced.

In the case of a film having a relatively large coefficient of friction between the film layers, the charging cycle is set to be longer than the inner circumferential length of the roll so that one layer is applied to each layer of the film.
The above-mentioned charge processing region may not be included. This is because if there is a vertically charged film even if it is about several layers apart, the adhesion works with a strength inversely proportional to the square of the distance. When the period of the charging process is set to be longer than the circumference of the innermost layer, the period of the charging process is preferably about 1 to 20 times the circumference of the innermost layer, and the ratio of the charging portion in one cycle is 10 to 10 times. Preferably it is 60%.

In the present invention, the charging section is not particularly limited, and it is sufficient that the charging section is at least one place in the width direction of the film. If the surface of the film to be vapor-deposited or coated is strongly charged by the charging process, the metal is not uniformly bonded to the film, and therefore, it is preferable that the edge portion which does not hinder the subsequent process is charged.

Further, when the width of the film roll body is wide, the accompanying air becomes large, so that the film is particularly likely to be displaced, and it is preferable to perform charging treatment at two or more places in the width direction such as both ends.

In the present invention, the film includes any polymer film such as a thermoplastic film, and a thermoplastic film is particularly preferable.

In the present invention, the film is preferably a film that can easily hold electric charge and does not dissipate the applied electric charge within a short time (time from when the electric charge is applied to when it is wound up). Insulating films are more preferred.

Further, the present invention is preferably applied to a film having a high air barrier property.

In the present invention, the film is made of, for example, polyester represented by polyethylene terephthalate, polyethylene-2,6-naphthalate, polyethylene, polyethylene, or the like.
Polyolefin represented by polypropylene, polyvinyl chloride, polyvinyl represented by polyvinylidene chloride and the like, a film composed of polyvinyl, polyamide, aromatic polyamide, polyphenylene sulfide, and the like.
Particularly, a polypropylene film and a polyethylene terephthalate film are preferable.

The film roll of the present invention can be applied not only to a thermoplastic resin film but also to a polymer film melted by a solvent.

The film roll body of the present invention is preferably applied to a film immediately after film formation used for a purpose such as vapor deposition, but is further used for magnetic tapes, capacitors, packaging materials, circuit boards, etc. It can also be preferably applied to a film that has been subjected to secondary processing such as coating or printing, vapor deposition, or lamination with another type of film.

The film roll of the present invention usually has a thickness of 0.1 mm.
A thick film of 2 to 0.5 mm, a film of 10 to 30 μm, and an extremely thin film of 1 to 3 μm can be used, and the film thickness is not particularly limited.

The film roll of the present invention can be suitably used for a wide range of applications such as magnetic tapes, packaging materials and capacitors. When used for magnetic tapes and capacitors,
A thin film is used. Further, the film roll body of the present invention is preferably used for a packaging material, particularly a film used for a food packaging material such as confectionery or the like which needs air and moisture barrier properties.

FIG. 3 shows an example of the method for producing a film roll of the present invention.

The film 4 is conveyed from left to right by a plurality of guide rollers 5 including metal rollers, and is wound up as a film roll. In this figure, the film is sandwiched between a guide roller and a discharge electrode 6 (here, a ring-shaped roller which is a ring-shaped discharge electrode is used) arranged as a nip roller, and a charging process is performed.

The ring-shaped discharge electrode 6 is connected to a high-voltage power supply 9, and a guide roller such as a conductive roller is usually grounded.

In the method for producing a film roll of the present invention, when a periodic voltage is applied, it is preferable to use a ring-shaped electrode as the discharge electrode. The needle electrode is highly corroded by a periodic electric field change, whereas the ring electrode has a small electric field concentration and hardly deteriorates by the periodic electric field change.

In the method for producing a film roll of the present invention, it is sufficient that the film can be stably charged, and there is no restriction on the dimensions of the ring-shaped electrode. Because
The ring diameter is preferably about 50 to 200 mm. The ring width of the ring-shaped electrode is preferably about 5 to 50 mm, particularly about 10 to 20 mm in order to make the charging section as small as possible. This is because the charging width required for preventing the displacement is sufficiently 20 mm, and if it is 10 mm or more, the ring can be easily formed.

Further, it is preferable to use a ring-shaped electrode which has been subjected to a process for imparting a curvature to the ring peripheral surface in order to prevent sparks from the electrode side surface to the film surface.

Further, in the method of manufacturing a film roll body of the present invention, when a film is broken, conductive rubber is applied to the surface of the ring-shaped electrode in order to prevent an excessive current from flowing due to contact between metal rolls. Preferably have
More preferably, the surface of the ring-shaped electrode is covered with conductive rubber. When the surface of the ring-shaped electrode is covered with conductive rubber, the width of the ring-shaped electrode becomes almost the same as the width of the charging section, and stable charging can be performed. Therefore, the width of the charging section can be reduced, and the width varies. Can be reduced.

The conductive rubber layer has a resistivity of 10 ⁴ to 10 ⁸ Ωc.
m and a thickness of about 1 to 10 mm.

Further, as shown in FIG.
An insulator having at least a portion of the side surface having an electrical resistance equal to or higher than that of the conductive rubber (side surface coating 2)
Preferably, it is covered by 5). This is to prevent unnecessary discharge from the metal part on the side surface of the electrode to the film. Thereby, the fluctuation of the width of the charging processing portion can be further reduced.

Further, in the method for manufacturing a film roll of the present invention, by providing a circuit for interrupting an excessive current,
When the film is broken, it is possible to prevent an excessive current from flowing due to contact between the metal rolls.

In the method for producing a film roll of the present invention, charging is performed at a predetermined cycle. In the present invention, the predetermined cycle means that the charging process is performed or stopped at a predetermined fixed cycle. A fixed period may be used throughout the entire length of the film roll, or the period may be changed stepwise according to the winding diameter. It is preferable because it is easy and can be used stably for a long period of time.

By keeping the cycle of the charging process constant,
As shown in FIG. 3, for example, as shown in FIG. 3, as the winding diameter of the film roll body changes, the circumference of the film roll body increases, and the charging processing section naturally moves in the circumferential direction. 1 are randomly arranged in the circumferential direction. If the charging section of the film roll is random, a portion where air hardly escapes and a portion where air easily escapes are dispersed, so that local deformation of the film roll can be prevented. Since the thus obtained film roll body 1 has no wrinkles or eccentricity at the aligned end faces, meandering and tearing when unwinding in a later step can be prevented.

Further, the charging section is randomly arranged in the circumferential direction of the film roll body 1 so that
Since it is possible to prevent the charging portion from being laminated at the same position on the film roll body and to cause a remarkable rise in charge, it is possible to prevent the occurrence of discharge marks 22 on the non-charging portion as shown in FIG.

In the method for producing a film roll body of the present invention, in order to charge the film 4 at a predetermined cycle,
Preferably, it can be realized by inputting the signal generated from the pulse generator 11 in FIG.

In the method for producing a film roll of the present invention, the preferable application cycle of the charging treatment is 0.05 to 1.
The range is 5 (m). If this value is smaller than 0.05, the clearance through which air escapes becomes smaller, and if it is larger than 1.5, the probability that the charged portions overlap with each other by 10 to 80% tends to be smaller than 1.

In the method for manufacturing a film roll of the present invention, as shown in FIG. 5, a gear-shaped ring electrode 8 can be used as a discharge electrode to apply a voltage intermittently at a constant cycle. . The gear-shaped ring electrode 8 is preferably formed such that circumferential irregularities at a constant pitch are formed on the ring-shaped electrode, and the height of the protrusion is made sufficiently larger than the discharge gap. In this case, a DC high-voltage power supply 13 can be used as a voltage applying means for the charging process.

In the method for producing a film roll of the present invention, the voltage that can charge the film is
Refers to a voltage sufficiently higher than the discharge start voltage depends on the thickness δ and the relative dielectric constant epsilon _r of the film. When a ring-shaped electrode as shown in FIG. 3 is used, the value of the voltage is preferably about 2 to 10 times the discharge starting voltage. The discharge starting voltage can be theoretically obtained from the following two equations.

[0059] gap between the ring electrode and the film formula _{V g = (V a -V c} ) Z / (δ / ε r + Z) of the voltage V _g applied to the (discharge gap) (1) (where, V _a is charging potential of the applied voltage, V _c is the film surface, Z is the discharge gap.) first-order approximation formula by the Paschen law breakdown voltage V _b in the air gap _{V b = 312 + 6.2Z (2} ) discharge starting voltage, the formula ( 1), is determined as the value of the determined V _a -V _c when the V _g = V _b in (2). If the influence of the charging potential of the film is ignored, the applied voltage can be obtained by the following equation.

[0060] _{V a = 312 + 6.2δ / ε} r + 88√ (δ / ε r) (3) if the periodically charged, without changing the voltage and current during discharge, 2 Introduction discharge start voltage It is preferable that the voltage is set to a constant voltage that is 10 times, since there is no fear that the voltage is reduced by the voltage control and the discharge becomes unstable.

Further, in order to stably perform the discharge, the ring-shaped electrode is preferably pressed against a counter electrode such as a ground conductive roller with a predetermined force. As a result, the above-described discharge gap is automatically formed.

In the method of manufacturing a film roll of the present invention, when the charging process is performed intermittently, a positive or negative charge is applied to the film roll so that the front and back surfaces of the vertically overlapping films do not have the same polarity. It is preferable to perform the process by applying a rectangular wave voltage of either polarity. The waveform of the rectangular wave voltage may be a substantially rectangular wave. The waveform may be a trapezoidal wave with a gentle rise and fall, or a shape obtained by rectifying a sine wave to a half-wave. It is preferable to use a rectangular wave because the ratio of the voltage stop can be easily controlled.

In the method for manufacturing a film roll of the present invention, it is preferable that the film is charged to have opposite polarities on both surfaces. When the film is charged on both sides, in the film roll, the film firmly adheres to the upper and lower layers in the charged portion.

In the case of a film having a conductive layer on one side such as a vapor-deposited film, it is sufficient if only the insulating surface is charged as required. That is, when the film of the conductive layer on one side is formed into a film roll, the charge is induced by electrostatic induction on the conductive layer in contact with the charged portion,
This is because the adhesion works.

In order to charge a film without a conductive layer on both sides, as shown in FIG. 3, the film is charged on a conductor having a low potential such as a grounding conductor, and then the film is easily peeled off from the conductor. realizable. This is because discharge occurs between the conductor and the back surface of the film at the time of peeling due to the charge on the surface of the film provided on the conductor, and a charge having a polarity opposite to that of the front surface is automatically applied to the back surface of the film.

In the method of manufacturing a film roll of the present invention, the conductive roller uses steel, aluminum or the like as a shaft material, and uses a metal roller having a surface made of plating, a conductive coating or a metal base. Is preferred. At this time, it is preferable that the conductive roller is grounded for safety and to apply a voltage from the ring-shaped discharge electrode to the conductive roller.

In the method of manufacturing a film roll of the present invention, the film is fed from a melt discharge source shown in FIG. 6 or a film unwinder such as a raw roll used in a slitter shown in FIG. Supplied.

FIGS. 6 and 7 illustrate a film winding mechanism usable in the method of manufacturing a film roll according to the present invention. The film roll of the present invention can wind the film roll by, for example, driving a pressure roller or a take-up roller with an electric motor. FIG. 7 is composed of a film supply mechanism A ′ composed of a material roll and a transport section B ′ composed of guide rollers.

As described above, the present inventors have intensively studied a method of manufacturing a film roll body, and have obtained a film roll body having a small width of a charged portion and no fluctuation. The variation of the width of the charged portion of the film roll obtained thereby is 10 mm or less, and the width of the charged portion is preferably within 20 mm. This allows
It has become possible to prevent wrinkles and misalignment while avoiding unnecessary charging of a processed portion in a later step.

Furthermore, the film roll of the present invention is particularly suitable as a raw material for vapor deposition since the film roll obtained by the production method of the present invention has a strong adhesive force and does not shift during evacuation by a vapor deposition machine. Are better.

[0071]

The present invention will be specifically described below with reference to examples. The evaluation methods in the following examples and comparative examples are as follows. As the film, a polypropylene film or a polyester film was used. (1) Charging Treatment After visualizing the charged part with toner, the width of the charged part was measured and evaluated according to the following criteria. The width was measured using a ruler. Width of electrification treatment portion ○: 15 mm or less, Δ: greater than 15 mm to 20 mm or less, ×: greater than 20 mm Difference between maximum width and minimum width ○: 10 mm or less, ×: 10 mm
Larger (2) Film winding appearance The amount of edge deviation was measured and evaluated according to the following criteria. Edge deviation ○: 0.5 mm or less, Δ: greater than 0.5 mm to 2 mm or less, ×: greater than 2 mm Regarding the state of the roll, the degree of wrinkling and the degree of eccentricity were evaluated in the following two stages. Wrinkling degree ○: good, △: acceptable, ×: below product level Degree of eccentricity ○: good, △: large fluctuation in tension due to eccentricity, ×: breakage due to eccentricity (3) Displacement in vacuum machine Original in vapor deposition machine The film roll was placed in a vacuum machine assuming a reverse deviation, and the state in which the deviation occurred due to evacuation was evaluated according to the same evaluation criteria as the end surface deviation.

Example 1 A polypropylene film having a width of 2 m and a thickness of 29 μm was produced at a film speed of 85 m / min by the production method illustrated in FIG.
And wound up to a length of 4500 m. Using a ring-shaped electrode having a diameter of 100 mm, a width of 10 mm, a rubber thickness of 2 mm, and an electrical resistivity of 2 × 10 ⁶ Ωcm in the shape of FIG. 9, a current value of −0.22 mA (applied) The voltage was set to -3.5 kV), and the film was charged intermittently under the conditions of 10 Hz (0.1 second cycle) and a voltage application time ratio of 50%. Table 1 shows the results.

The film roll thus obtained is
As shown in Table 1, the width of the charging section is stable at 10 to 11 mm (the difference between the maximum width and the minimum width is 1 mm), and the end face deviation during winding and the deviation in the vacuum machine due to the strong adhesion force. There was none.

Further, by setting the proportion of the charged portion of the film roll body to 50%, air can escape from the end portion, and wrinkles and eccentricity are about 0.1 mm to minimize tension fluctuation. Thus, an ideal raw material for vapor deposition was obtained.

Comparative Example 1 A polypropylene film having a width of 2 m and a thickness of 29 μm was wound up to a length of 4500 m at a film speed of 85 m / min in the same manner as in Example 1 by the production method illustrated in FIG. A needle electrode is placed at both ends, and a voltage of -7 kV is applied to the needle electrode.
In order to make the length of the charged part and the non-charged part equal,
The charging process was performed intermittently in synchronization with the rotation. Table 1 shows the results.

The current value of the needle electrode is unstable, and as a result,
The difference between the maximum width and the minimum width of the charging section exceeded 10 mm and was about 15 mm. Therefore, although the charging processing width was initially set to 10 mm, the width of the charging processing portion exceeded 20 mm in some places, resulting in a reduction in the area to be subjected to the vapor deposition processing. In addition, the discharge of the needle electrode was unstable, and the charging of this portion was very small. Therefore, in evacuation at the time of vapor deposition, a displacement exceeding 30 mm occurred in the surface layer.

Although air bleeding between the film layers was good and no wrinkles were generated, tension fluctuation due to eccentricity was observed as compared with Example 1 due to charging treatment in synchronization with rotation.

Example 2 A film was continuously produced by the production method shown in Example 1 except when the machine was stopped. Even after one year of use, the voltage and current applied to the ring-shaped discharge electrode did not fluctuate greatly without any noticeable damage to the electrode roll. Further, the state of the charged portion of the obtained film roll and the appearance of the rolled film did not significantly change, and were favorable.

Comparative Example 2 In the same manner as in Example 2, a film was continuously produced by the production method shown in Comparative Example 1 except at a stop. The current value of the needle electrode was unstable, and as a result, the difference between the maximum width and the minimum width of the charging section exceeded 10 mm and was about 20 mm. Due to the adhesion of dust to the electrode, cleaning is required once / week, the tip of the electrode is corroded to the extent that it can be seen at the time of use for three months, and the difference between the maximum width and the minimum width of the charging section is further increased. Needed replacement. After this, the same needle-shaped electrode was used for 6 months, but there was significant corrosion as before the replacement, and it was necessary to increase the voltage to 1.5 times that at the start in order to obtain the effect of preventing end face displacement. However, the contacts deteriorated due to high-voltage switching, and abnormal noise was generated from the power supply. The need for repair has arisen.

Example 3 The same manufacturing method as in Example 1 was used, but the width was 3.5 m and the thickness was 10 μm.
m stretched polyester film at a film speed of 200
It was wound up to a length of 90000 m at m / min. The current value flowing through the electrode during the charging process was -0.1 mA (applied voltage -2.0 kV), and the charging process was intermittently performed under the conditions of 50 Hz (0.02 second cycle) and 60% of the time rate of voltage application. Was done.

Since the winding diameter was large, no evaluation was made in a vacuum machine, but the other evaluation items were as good as in Example 1.

Comparative Example 3 The same method as in Comparative Example 1 was used except that the width was 3.5 m and the thickness was 10 μm.
m stretched polyester film at a film speed of 200
It was wound up to a length of 90000 m at m / min. A needle-like electrode is placed at both ends, a voltage of 10 kV is applied to the needle-like electrode, and the length of the charged portion and the non-charged portion is equal at four locations per rotation of the film roll. The charging process was performed intermittently in synchronization with the rotation.

As shown in Table 1, the current value was controlled so as to minimize the end face deviation. However, it was necessary to increase the voltage by 10 kV, and the width of the charging section exceeded 30 mm, and the maximum width was reduced. The difference of the minimum width is about 20mm, 10mm
Exceeded. In addition, the eccentricity increases because the winding diameter is large,
Although it did not tear, the tension varied significantly and wrinkles occurred.

[0084]

[Table 1]

[0085]

According to the present invention, it is possible to simultaneously realize strong displacement prevention and air bleeding from the end portion, and obtain a film roll body free from displacement, wrinkling, deformation, and eccentricity of the end surface. Can be.

According to the method for manufacturing a film roll of the present invention, the end face shift,
A film roll body without wrinkles, eccentricity and deformation can be manufactured.

The film roll of the present invention has a strong adhesive force and does not shift when vacuumed by a vapor deposition machine, so it is particularly excellent as a raw material for vapor deposition, and is suitable for a wide range of uses such as magnetic tapes, packaging materials and capacitors. used.

[Brief description of the drawings]

FIG. 1 is a front view showing one embodiment of a film roll body of the present invention.

FIG. 2 is an external view of a film showing one embodiment of the film of the present invention.

FIG. 3 is a configuration diagram showing one example of a method for manufacturing a film roll body of the present invention.

FIG. 4 is a configuration diagram showing a conventional method for manufacturing a film roll body.

FIG. 5 is a configuration diagram showing another example of the method for manufacturing a film roll body of the present invention.

FIG. 6 is a configuration diagram showing another example of the method for manufacturing a film roll body of the present invention.

FIG. 7 is a configuration diagram showing another example of the method for manufacturing a film roll body of the present invention.

FIG. 8 is a perspective view of a film roll manufactured by a conventional charging method.

FIG. 9 is a cross-sectional view showing one example of a ring-shaped electrode used in the method for manufacturing a film roll body of the present invention.

[Explanation of symbols]

 1: film roll 2: charging section 3: winding roller 4: film 5: guide roller 6: ring-shaped discharge electrode 7: needle-shaped discharge electrode 8: gear-shaped ring electrode 9: high-voltage power supply 10: high-voltage amplifier 11: Pulse waveform generator 12: Control device 13: DC high-voltage power supply 14: Pressure roller 15: Rotational speed detection device of film roll body 16: Film contact portion 17: Film non-contact portion 18: Melt discharge source 19: Solidification drum 20 : Material roll 21: Slit blade 22: Discharge mark 23: Bearing 24: Conductive rubber layer 25: Side surface coating A, A ': Film supply mechanism B, B': Conveying unit S: Period of charging part E: Charging Length of processed part X: Maximum width of charged part Y: Minimum width of charged part

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) G03C 3/00 560 G03C 3/00 560P 560Q // C08L 101: 00 C08L 101: 00 F term (reference) 3F055 AA05 CA01 DA06 EA01 FA17 4F073 AA32 BA08 BA24 BB01 CA21 CA53

Claims (21)

[Claims] 1. A film roll body characterized in that at least a part in a width direction of a film wound in a roll shape has a charging section in which a difference between a maximum width and a minimum width is within 10 mm. 2. The charging section is intermittently present at a predetermined cycle in the longitudinal direction of the film, and the ratio of the charging section is 10 to 80% of one cycle in the longitudinal direction. The film roll according to claim 1. 3. The film according to claim 1, wherein the ratio of the charging section is 40 to 60% in one cycle in the longitudinal direction of the film.
The film roll body according to 1. 4. The film roll according to claim 1, wherein the width of the charging section is within 20 mm. 5. The film roll according to claim 1, wherein the charging section is an end of the film roll. 6. The film roll according to claim 1, wherein a period of the charging process is shorter than a circumferential length of an innermost layer of the film roll. 7. The film roll according to claim 1, wherein the film is a thermoplastic film. 8. The film roll according to claim 1, wherein the film is an insulating film. 9. The film roll according to claim 1, wherein the film is a polypropylene film or a polyethylene terephthalate film. 10. The film according to claim 1, wherein the film is a raw material for vapor deposition.
10. The film roll according to any one of 9 above. 11. The film roll according to claim 1, wherein the film is a packaging material film. 12. A film roll in which a charging process is performed intermittently in a predetermined cycle in a longitudinal direction of the film, and a time ratio of performing the charging process in one cycle is 10 to 80%. Production method. 13. The method for manufacturing a film roll according to claim 12, wherein the cycle of the charging treatment is constant. 14. The method for producing a film roll according to claim 12, wherein a time ratio of performing the charging treatment within one cycle is 40 to 60%. 15. The method for producing a film roll according to claim 12, wherein the charging treatment is performed using a ring-shaped electrode. 16. The method according to claim 15, wherein the ring-shaped electrode has a conductive rubber on the surface. 17. A method according to claim 15, wherein at least a part of the side surface of said ring-shaped electrode is coated with said conductive rubber or a material having a resistance value equal to or higher than said conductive rubber.
The method for producing a film roll body according to the above. 18. The method for producing a film roll according to claim 12, wherein the other surface of the film is subjected to a charging treatment in a state where one surface of the film is in close contact with the conductive roller. 19. The cycle of the charging process is 1 to 20 times the circumferential length of the innermost layer of the film roll body, and the ratio of the charging section to be set to one cycle is 10 to 50%.
19. The method for producing a film roll according to any one of claims 18 to 18. 20. The cycle of the charging process is 0.05 to 1.5.
The method for producing a film roll according to any one of claims 12 to 19, which is (m). 21. The method according to claim 12, wherein when the relative dielectric constant of the film is εr and the film thickness is δ (μm), the applied voltage is 2 to 10 times the voltage Va determined by the following equation. The method for producing a film roll body according to the above. Va = 312 + 6.2δ / εr + 88√ (δ / εr)