JP6807277B2 - Head, foreign matter removing device, film manufacturing equipment, foreign matter removing method, and film manufacturing method - Google Patents

Description

The present invention relates to a head, a foreign matter removing device including the head, a film manufacturing apparatus including the foreign matter removing device, a foreign matter removing method using the above-mentioned foreign matter removing device, and a film manufacturing method using the above-mentioned film manufacturing apparatus.

Conventionally, in a film manufacturing method, various rolls are often used mainly for the purpose of film transport.
In such a film manufacturing method, if foreign matter adheres to the surface of the transport roll, the foreign matter may contaminate the film, or the foreign matter may cause defects such as scratches on the film.

Further, as a method for producing a film, a melt extrusion method is known in which a thermoplastic resin composition, which is a raw material for a film, is extruded into a film from a die in a molten state by using a melt extruder.
In this method, a pair of rolls of a film-like thermoplastic resin composition extruded from a die are rolled in order to reduce uneven thickness and surface irregularities of the film obtained by the melt extrusion method to obtain surface smoothness. It is often sandwiched between (touch roll and cast roll) to form a film (see, for example, Patent Document 1).

The surfaces of touch rolls and cast rolls are often contaminated by the factors described below, in addition to contamination by the adhesion of foreign substances floating in the air.
Since the touch roll and cast roll come into direct contact with the molten resin, a small amount of low molecular weight components precipitated from the resin may adhere to the roll surface, or the gas generated from the resin may aggregate and adhere. The roll surface is easily contaminated over time.

The process of forming a dent defect when a foreign substance adheres to the surface of the touch roll or the cast roll will be described with reference to FIG. 7.
For example, as shown in FIGS. 7A and 7B, if the foreign matter 114 adheres to the surface of the roll 111, the film 113 is sandwiched and molded by the pair of rolls 111 and 112. The shape of the foreign matter 114 is transferred to the film 113, and as shown in FIG. 7C, a dent defect 113a is generated in the film 113. At this time, since the roll 111 continues to rotate at a constant cycle, unless the foreign matter 114 falls off from the surface of the roll 111, dent defects 113a are periodically and continuously generated, and the quality of the film 113 is greatly impaired.
In particular, in the melt extrusion method, since the film 113 is soft at a high temperature, a dent defect 113a may occur even if the foreign matter on the rolls 111 and 112 is minute (several μm in height).

Therefore, the rolls 111 and 112 may be equipped with a roll cleaner device for removing foreign matter adhering to the roll surface.

As such a roll cleaner device, for example, a device having a pressing body provided with a pressing portion for pressing a cleaning cloth (cloth) against the roll surface by a surface having a size of 40 cm × 5 mm (paragraph [0024] of Patent Document 1, FIG. 1 and the like). A device having a pressing body provided with a pressing portion for pressing a cleaning cloth (cloth) against the roll surface by a surface on which a plurality of convex portions are formed (Patent Document 2, paragraph [0036], FIG. 4, etc.). See.) Has been proposed.

Japanese Unexamined Patent Publication No. 2013-123666 Japanese Unexamined Patent Publication No. 2013-237170

However, in the roll cleaner device described in Patent Document 1, since the cloth is pressed on a wide surface, the force on which the cloth is pressed on the roll surface is not so large. Therefore, the roll cleaner device described in Patent Document 1 has a problem that foreign matter on the roll surface cannot always be removed satisfactorily.
Further, in the roll cleaner device described in Patent Document 1, since the pressing portion presses the roll surface at one place, the pressing portion tends to slip, which tends to cause vibration in the pressing body. When the pressing body vibrates, it is difficult to remove foreign matter on the roll surface satisfactorily.

Further, in the roll cleaner device described in Patent Document 2, since the force for pressing the cloth is dispersed in a large number of protrusions provided in the pressing portion, the force for pressing the cloth on the roll surface is not so large. Therefore, the roll cleaner device described in Patent Document 2 also has a problem that foreign matter on the roll surface cannot always be removed satisfactorily.

The present invention includes a foreign matter removing device capable of satisfactorily removing foreign matter adhering to the roll surface while suppressing vibration, a head preferably used in the foreign matter removing device, and a film manufacturing apparatus including the above-mentioned foreign matter removing device. An object of the present invention is to provide a foreign matter removing method using the above-mentioned foreign matter removing device and a film manufacturing method using the above-mentioned film manufacturing apparatus.

The present inventors have a foreign matter removing device including a head, a cloth, and a pressing device for removing foreign matter adhering to the surface of the roll, which are in contact with the roll and have a major axis and a minor axis, respectively. Using a head in which two cleaning portions having a band-shaped contact surface are arranged so that the major axis directions of the contact surfaces are parallel to each other, the width of the minor axis on the contact surface is set to 3 mm or less, and the cloth is made. By arranging the two cleaning portions so that they can come into contact with the contact surface with the roll and applying a force to the head from the cleaning portion side toward the cross side by the pressing device, the above-mentioned We have found that the problem can be solved and have completed the present invention.

That is, the present invention
(I) A head for a foreign matter removing device that removes foreign matter adhering to the surface of the roll.
The head has two cleaning sections provided in contact with the roll.
The cleaning portion has a strip-shaped contact surface having a major axis and a minor axis, and has a strip-shaped contact surface.
The width of the minor axis of the contact surface is 3 mm or less,
The heads are arranged so that the major axis directions of the contact surfaces of the two cleaning portions are parallel to each other.
(Ii) The head includes a head body,
The surface of the head body includes a support surface that supports the two cleaning portions.
The head according to (i), wherein each of the two cleaning portions is a convex portion provided on a support surface.
(Iii) The head according to (ii), wherein the protrusion height of the convex portion from the support surface is 1 mm or more and 5 mm or less.
(Iv) The head according to any one of (i) to (iii), which has a liquid supply unit for supplying a cleaning liquid.
(V) It has a liquid supply unit that supplies the cleaning liquid,
The liquid supply unit is provided with a liquid supply passage and a liquid supply port.
A liquid supply path is provided inside the head body,
The liquid supply port is the end of the liquid supply path,
The head according to (ii) or (ii), wherein the liquid supply port is provided between the two cleaning portions on the support surface.
(Vi) The head according to (v), wherein the protrusion height of the convex portion from the support surface is 1 mm or more and 4 mm or less.
(Vi) A foreign matter removing device for removing foreign matter adhering to the surface of a roll, comprising the head, cloth, and pressing device according to any one of (i) to (vi).
The cloth is arranged so as to be able to contact the contact surface with the roll provided by each of the two cleaning parts.
A foreign matter removing device, in which the pressing device applies force to the head from the cleaning unit side toward the cross side.
(Vii) The foreign matter removing device according to (vii), wherein the cloth is movably arranged in the direction of the minor axis of the contact surface.
(Ix) Equipped with a cross winding device
The foreign matter removing device according to (viii), wherein the cloth winding device moves the cloth in the direction of the minor axis of the contact surface by winding the cloth.
(X) A film manufacturing apparatus including one or more rolls for transporting a film.
In at least one of the one or more rolls, one or more foreign matter removing devices according to any one of (vii) to (ix) are arranged in the vicinity of the surface of the rolls.
When the pressing device applies a force to the head when removing foreign matter on the surface of the roll, the contact surfaces of the two cleaning parts come into contact with the surface of the roll via the cloth.
(X) The film manufacturing apparatus according to (x), comprising a moving device for moving the foreign matter removing device in the width direction of the roll.
(Xii) The film manufacturing apparatus includes a cast roll and a touch roll as rolls.
In a film manufacturing apparatus, a melt of a film-like thermoplastic resin composition is sandwiched between a cast roll and a touch roll and molded into a film while being conveyed.
The film manufacturing apparatus according to (x) or (xi), wherein one or more foreign matter removing devices are arranged in the vicinity of at least one surface of the cast roll and the touch roll.
(Xiii) A method for removing foreign matter on the surface of a roll by using the foreign matter removing device according to any one of (vii) to (ix).
A method for removing foreign matter, wherein the pressing device applies a force to the head to bring the contact surfaces of the two cleaning portions into contact with the surface of the roll via a cloth to remove foreign matter.
(Xiv) The method for removing foreign matter according to (xiii), wherein the foreign matter is removed while the roll is rotated and the foreign matter removing device is stationary.
(Xv) A method for producing a film using the film producing apparatus according to any one of (x) to (xii), and.
The pressing device applies a force to the head to bring the contact surfaces of the two cleaning portions into contact with the surface of the roll via a cloth, thereby removing foreign matter on the surface of the roll. Production method,
I will provide a.

According to the present invention, a film manufacturing provided with a foreign matter removing device capable of satisfactorily removing foreign matter adhering to the roll surface while suppressing vibration, a head preferably used in the foreign matter removing device, and the above-mentioned foreign matter removing device. It is possible to provide an apparatus, a foreign matter removing method using the above-mentioned foreign matter removing apparatus, and a film manufacturing method using the above-mentioned film manufacturing apparatus.

It is a figure which shows typically the mode in which a head provided with two cleaning portions on a support surface contacts a roll surface through a cloth. It is a figure which shows typically the mode in which a head provided with three cleaning portions on a support surface contacts a roll surface through a cloth. It is a figure which shows typically the mode in which a head provided with a single cleaning part on a support surface contacts a roll surface through a cloth. It is a figure which shows typically the mode that the head which has the liquid supply part in a head body contacts a roll surface through a cloth. It is a figure which shows typically the shape of the head observed from the direction perpendicular to a support surface. It is a figure which shows typically one aspect of a preferable film manufacturing apparatus. It is a figure which shows typically the process which the dent defect caused by the foreign matter on the roll surface is formed in the film in the sandwich molding of a film.

≪Head≫
The head is a head for a foreign matter removing device that removes foreign matter adhering to the surface of the roll.
The head comprises two cleaning sections provided in contact with the roll. Each of the two cleaning sections has a strip-shaped contact surface having a major axis and a minor axis. Each contact surface comes into contact with the roll via a cloth described later. The two cleaning portions are arranged so that the major axis directions of the contact surfaces provided with each are parallel to each other. The width of the minor axis on the contact surface provided by the cleaning portion is 3 mm or less.
By forming a foreign matter removing device by combining a head satisfying the above requirements with a cloth described later, the foreign matter removing device can be used to satisfactorily remove foreign matter adhering to the roll surface while suppressing vibration.
Here, the positions of the two cleaning portions on the head are not particularly limited as long as the heads can be arranged so that the major axis direction of the contact surface provided by each cleaning portion is parallel to the width direction of the roll. .. The head is placed near the surface of the roll.
Hereinafter, preferred embodiments of the head will be described with reference to FIG. FIG. 1 is a schematic view of a cross section of a foreign matter removing device and a roll when the head is arranged in the vicinity of the roll as a foreign matter removing device together with a cloth, as viewed from the end face side of the roll.
The shape of the contact surface and the minor and major diameters of the contact surface will be described later.

First, the roll 100 to be cleaned may be a drum-shaped roll that can rotate about a rotation axis, and is typically a roll for transporting a film used in a film manufacturing apparatus.
The roll for transporting the film is not limited to the roll used only for the purpose of transporting, and may be a roll (for example, a touch roll and a cast roll) for sandwiching and molding the film while transporting the film. It may be a stretching roll that stretches the film while transporting the film.
In the specification of the present application, the operation of removing foreign matter adhering to the surface of the roll is also referred to as "cleaning".

The head 16b includes two cleaning portions 21. The two cleaning portions 21 each include a strip-shaped contact surface 21a having a major axis and a minor axis. The contact surface 21a comes into contact with the roll 100 via 16a, which will be described later.
The band shape of the contact surface 21a means a rectangle (rectangle) having a major axis and a minor axis, or a shape similar to a rectangle.
The shape of the contact surface will be described with reference to FIG. FIG. 5 is a diagram showing a shape in which the head 16b having the configuration shown in FIG. 1 is observed from a direction perpendicular to the support surface 22.
As shown in FIG. 5A, the strip-shaped shape of the contact surface 21a in contact with the roll 100 in the cleaning portion 21 is preferably rectangular. The shape of the contact surface 21a is preferably a shape similar to a rectangle (rectangle).
The shape similar to a rectangle is not particularly limited as long as it can be recognized as a shape close to a rectangle when visually observed.
Examples of the shape similar to a rectangle include a quadrangle that can be visually recognized as having a shape close to a rectangle but does not geometrically correspond to a rectangle. Examples of such a quadrangle include a trapezoid, a parallelogram, and the like, in which at least one of the short sides is not perpendicular to a pair of parallel long sides.
Further, a shape in which at least one side of the short side of the rectangle is curved and the shape can be visually recognized as close to the rectangle is also mentioned as a shape similar to the rectangle. Examples of such a shape include a shape in which the short side of a rectangle is replaced with an arc or a parabola.
As a preferable specific example of the shape similar to the rectangle, as shown in FIG. 5 (b), a shape in which the side corresponding to the short side of the rectangle is changed to an arc or a parabola (a parabola in FIG. 5 (b)) and the like can be mentioned. Be done.
When the strip-shaped shape is a rectangle or a shape similar to a rectangle, the diameter in the same direction as the long side is the major axis, and the diameter in the same direction as the short side is the minor axis. The minor diameter can also be said to be the diameter in the direction perpendicular to the long side. The width of the minor axis is the width between the parallel long sides.
Next, the arrangement of the two cleaning portions 21 will be described with reference to FIGS. 1 and 5 by taking the case where the head 16b has the configuration shown in FIG. 1 as an example.
In FIG. 1, the head 16b has a head body 20, the head body 20 has a support surface 22 on the side in contact with the roll, and two cleaning portions 21 are provided so as to project from the support surface 22. As described above, FIG. 5 is a diagram showing a shape in which the head 16b having the configuration shown in FIG. 1 is observed from a direction perpendicular to the support surface 22. Here, as shown in FIGS. 5A and 5B, two cleaning portions 21 are provided so that the major axis directions of the two contact surfaces 21a are parallel to each other.
The width of the minor axis of the contact surface 21a provided by each of the two cleaning portions 21 is 3 mm or less.

In order to make good contact between the contact surface 21a and the surface of the roll 100, the foreign matter removing device 16 provided with the head 16b has a major axis direction of each contact surface 21a provided in the two cleaning portions 21 of the roll 100. It is arranged and used near the surface of the roll 100 so as to be parallel to the width direction.

In the foreign matter removing device 16, the contact surface 21a provided by each of the two cleaning units 21 contacts the surface of the roll 100 to be cleaned via the cloth 16a while applying pressure to the cloth 16a described later. As a result, the surface of the roll 100 is cleaned.
In addition, in this specification, for convenience, it may be described that the cleaning part 21 or the contact surface 21a comes into contact with the surface of the roll 100. In this case, it does not mean that the cleaning portion 21 or the contact surface 21a directly contacts the surface of the roll 100, but means that the cleaning portion 21 or the contact surface 21a comes into contact with the surface of the roll 100 via the cloth 16a.

For example, as shown in FIG. 2, when the number of cleaning portions 21 is 3 or more, in order to bring all the cleaning portions 21 into contact with the surface of the curved roll 100, cleaning at the time of manufacturing the head 16b In the formation of the portion 21, an extremely high level of position accuracy and dimensional accuracy is required.
However, as shown in FIG. 1, when the number of cleaning units 21 is two, even if the positions and dimensions of the cleaning units 21 are slightly deviated, both of the two cleaning units 21 are in a desired state. Can come into contact with the surface of the roll 100.

Further, when the number of cleaning portions 21 is 3 or more, when the foreign matter removing device 16 is pressed against the surface of the roll 100, it is difficult to apply a large pressure to the surface of the roll 100 via the cleaning portions 21. This is because the force applied to the plurality of cleaning portions 21 is dispersed in a large number of locations.
When a force of the same magnitude is applied to the foreign matter removing device 16, if the number of cleaning units 21 is 3 or more, the force applied to one cleaning unit 21 is smaller than when the number of cleaning units 21 is 2. It is difficult to obtain good cleaning performance.
On the other hand, when there are two cleaning units, it is easy to apply a large force to the cleaning unit 21 and it is easy to obtain good cleaning performance.

Further, as shown in FIG. 3, when there is only one cleaning unit 21, when the foreign matter removing device 16 is brought into contact with the surface of the roll 100, the foreign matter removing device 16 is slippery on the surface of the roll 100 and removes foreign matter. The device 16 tends to vibrate. When the foreign matter removing device 16 vibrates, it is difficult to transmit a large force from the foreign matter removing device 16 to the roll surface 100, so that it is difficult to obtain good foreign matter removing performance.

On the other hand, when there are two cleaning units 21, when the foreign matter removing device 16 comes into contact with the surface of the roll 100, the two cleaning parts 21 fix the contact position of the foreign matter removing device 16 with the surface of the roll 100, and the foreign matter is removed. Vibration of the foreign matter removing device 16 is unlikely to occur during the removing operation.
In particular, since the minor axis of the contact surface 21a with the roll 100 is as short as 3 mm or less in the two cleaning portions 21, the pressure applied to the surface of the roll 100 from each of the two cleaning portions 21 is high, so that the foreign matter removing device 16 is used. Upon contact with the surface of the roll 100, the position of the foreign matter removing device 16 is firmly fixed, and as a result, the generation of vibration is suppressed.
For the above reasons, when the foreign matter removing device 16 provided with the head 16b is used, the generation of vibration when the foreign matter removing device 16 comes into contact with the surface of the roll 100 is remarkably suppressed, so that good foreign matter removing performance can be obtained. Be done.

Further, the lower limit of the minor axis of the contact surface 21a with the roll 100 in the two cleaning portions 21 is not particularly limited. 0.3 mm or more is preferable, 0.5 mm or more is more preferable, 0.7 mm or more is particularly preferable, and 1 mm or more is the most preferable in that the head 16b can be easily manufactured with high dimensional accuracy and sufficient durability of the head 16b can be ensured. preferable.

Further, when there is only one cleaning unit 21 and the width of the minor axis of the contact surface 21a of the cleaning unit 21 with the roll 100 is as large as more than 3 mm, the contact area between the contact surface 21a and the surface of the roll 100 tends to be large. If the contact area between the contact surface 21a and the surface of the roll 100 is large, the pressure applied to the surface of the roll 100 by the foreign matter removing device 16 during cleaning is small, so that it is difficult to obtain good foreign matter removing performance.

The position and the way of providing the cleaning portion 21 on the head 16b are not particularly limited as long as the above requirements are satisfied.
Since it is particularly easy to suppress the occurrence of vibration in the foreign matter removing device 16, it is preferable that the head 16b is provided with the head body 20 and two cleaning portions 21 are provided as convex portions 21b on the head body 20. ..
Specifically, it is preferable that the surface of the head body 20 includes a support surface 22 that supports two cleaning portions 21, and the cleaning portion 21 includes a convex portion 21b on the support surface 22.
The support surface 22 is a surface of the surface of the head body 20 facing the surface of the roll 100 via the cloth 16a when the foreign matter removing device 16 is arranged in the vicinity of the roll 100. The support surface 22 supports the two cleaning portions 21 in a state where they are joined to the support surface 22 with a seam, or in a state where they are seamlessly integrated with the support surface 22.
In this case, the distance between the two cleaning portions 21 on the support surface 22 is not particularly limited, but is 10 mm or more and 30 mm in that it is easy to suppress the generation of vibration in the foreign matter removing device 16 while reducing the size of the foreign matter removing device 16. The following is preferable, and 15 mm or more and 25 mm or less is more preferable.

In the above preferred head 16b, the cleaning unit 21 may be integrally formed with the head main body 20, or may be separately formed from the head main body 20 and joined to the head main body 20.
The cleaning unit 21 is integrally formed with the head body 20 in that the cleaning unit 21 does not come off from the head body 20 or loosen between the head body 20 and the cleaning unit 21. preferable.
Further, when the two cleaning portions 21 are formed as convex portions 21b directly on the support surface 22 of the head body 20, even if one cleaning portion 21 is lifted from the surface of the roll 100 during cleaning, the other cleaning portion 21 is cleaned. The repulsive force generated when the portion 21 comes into contact with the surface of the roll 100 more strongly is transmitted to the raised cleaning portion 21 via the head body 20. As a result, the raised cleaning portion comes into contact with the surface of the roll 100 again.
As a result, it is easy to prevent cleaning from being performed in a state where one of the two cleaning portions 21 is floating.

In the above-mentioned preferable head 16b, the protruding height of the convex portion 21b from the support surface 22 is preferably 1 mm or more and 5 mm or less, more preferably 1 mm or more and 4 mm or less, and particularly preferably 1 mm or more and 2 mm or less. In this case, it is easy to obtain good foreign matter removing performance while suppressing the occurrence of vibration in the foreign matter removing device 16.

Further, the foreign matter removing device 16 is preferably a wet device used by permeating the cleaning liquid into the cloth 16a because the foreign matter removing effect is particularly high.
Therefore, the head 16b preferably includes a liquid supply unit 23 for supplying the cleaning liquid. From the viewpoint of easily simplifying the structure of the head 16b, it is preferable that the liquid supply unit 23 is provided in the head body 20 in the head 16b including the head body 20 as shown in FIG.
In this case, the liquid supply unit 23 includes a liquid supply passage 23a and a liquid supply port 23b. The liquid supply port 23b is one end of the liquid supply passage 23a.
The liquid supply passage 23a may be provided in the head main body 20, and the liquid supply port 23b may be provided in any place of the head main body 20 as long as the cleaning liquid can be supplied to the cloth 16a. Since it is easy to supply the cleaning liquid well to the portion of the cloth 16a that comes into contact with the roll 100, the liquid supply port 23b is provided between the two cleaning portions 21 on the support surface 22 of the head body 20. preferable.

Normally, a cleaning liquid storage container (not shown) or a cleaning liquid supply line (not shown) is connected to the end of the liquid supply passage 23a on the opposite side of the liquid supply port 23b. A pump can be provided between the liquid supply passage 23a and the cleaning liquid storage container or the cleaning liquid supply line, if necessary, and a valve, preferably a solenoid valve, can be provided. By doing so, it is easy to adjust the flow rate of the cleaning liquid to a desired flow rate.

When the head 16b including the head main body 20 and the cleaning portion 21 protruding from the support surface 22 of the head main body 20 as described above includes the liquid supply portion 23, the support surface of the convex portion 21b constituting the cleaning portion 21 The protruding height from 22 is preferably 1 mm or more and 4 mm or less, more preferably 1 mm or more and 3 mm or less, and particularly preferably 1 mm or more and 2 mm or less. In this case, it is easy to suppress contamination of the surface of the roll 100 due to leakage of the cleaning liquid.

The material of the head body 20 and the cleaning portion 21 is not particularly limited as long as it is a material that is not easily deformed or destroyed by the cleaning operation or is not thermally deteriorated. The material of the head body 20 and the cleaning portion 21 may be an inorganic material such as metal or an organic material such as resin, but the surface of the roll 100 is not easily damaged and processing is easy. Resin is preferable.

As the resin, a material having excellent heat resistance and chemical resistance is preferable. For example, polyolefin (polyethylene (PE), polypropylene (PP), polycyclic olefin, etc.), polystyrene (PS), AS resin, ABS resin, polyvinyl chloride. (PVC), polyacrylonitrile (PAN), (meth) acrylic resin, cellulose-based resin, aliphatic polyamide (nylon 6, nylon 6, 6, nylon 12, nylon 6, 12, etc.), aromatic polyamide (MXD nylon, etc.) , Aromatic polyester resin (polyethylene terephthalate resin (PET), polybutylene terephthalate resin (PBT), polyethylene naphthalate resin (PEN), etc.), polycarbonate (PC), polyacetal (POM), polyphenylene ether resin (PPE), polyarylene. Examples thereof include sulfide (PAS) (polyphenylene sulfide resin (PPS), etc.), polysulfone (PSu), polyimide (PI), fluororesin, and the like.

≪Foreign matter removal device≫
The foreign matter removing device 16 is used for removing foreign matter adhering to the surface of the roll 100.
The foreign matter removing device 16 includes the above-mentioned head 16b, a cloth 16a, and a pressing device (not shown).
The cloth 16a is arranged so that the contact surfaces 21a provided by the two cleaning portions 21 of the head 16b can come into contact with the roll 100 via the cloth 16a.
The pressing device applies a force to the head 16b from the cleaning unit 21 side toward the cloth 16a side.
In the above-mentioned foreign matter removing device 16, the cloth 16a is pressed against the surface of the roll 100 by the force applied to the cloth 16a via the cleaning unit 21 by the pressing device. Then, the cloth 16a pressed against the surface of the roll 100 is used to wipe the surface of the roll 100 for cleaning.

The foreign matter removing device 16 is arranged at a position away from the surface of the roll 100 except when cleaning the roll 100. By avoiding unnecessary contact between the roll 100 and the cloth 16a, deterioration of the cloth 16a due to friction and heat and dust generation from the cloth 16a can be prevented.
Then, when cleaning the roll 100, the foreign matter removing device 16 is brought into contact with the surface of the roll 100 by the above-mentioned pressing device.

Examples of the pressing method by the pressing device include hydraulic pressure, pneumatic pressure, and mechanical pressing. When the foreign matter removing device 16 is pressed to bring the foreign matter removing device 16 into contact with the roll 100, it is preferable that the pressure is uniform in the width direction of the roll 100. The pressing pressure against the roll 100 depends on the shape of the head 16b, but is preferably 5 kg / cm ² or more and 20 kg / cm ² or less, and more preferably 10 kg / cm ² or more and 15 kg / cm ² . By pressing within the above range, foreign matter can be easily removed without damaging the surface of the roll 100.

The foreign matter is removed while moving at least one of the surface of the roll 100 and the foreign matter removing device 16. Since the structure of the foreign matter removing device 16 is simplified and the foreign matter removing device 16 can be easily miniaturized, the foreign matter removing device 16 is in a stationary state while being in contact with the surface of the roll 100, and the roll 100 is rotating in an arbitrary direction. Therefore, it is preferable to remove foreign matter.

The cloth 16a is arranged so that the contact surfaces 21a provided by the two cleaning portions 21 of the head 16b can come into contact with the roll 100 via the cloth 16a.
Preferably, the cloth 16a is arranged so as to be bridged over the two cleaning parts 21 so that the entire surface of the contact surface 21a provided by the two cleaning parts 21 is in contact with the cloth 16a.
The cloth 16a may or may not be fixed to the head 16b.

When the cloth 16a is fixed to the head 16b and used, the method of fixing the cloth 16a to the head 16b is not particularly limited. For example, the head 16b may be provided with a clip-type holding portion (not shown) capable of sandwiching the cloth 16a, or the cloth 16a may be fixed to the head 16b with screws, screws, or the like.

Since the cloth 16a in a clean state can be brought into contact with the surface of the roll 100 for a long period of time, the cloth 16a is not fixed to the head 16b and can move in the direction of the minor axis of the contact surface 21a provided in the cleaning portion 21. It is preferable to be arranged.
As an example of a method of arranging the cloth 16a so as to be movable in the direction of the minor axis of the contact surface 21a included in the cleaning portion 21, an annular endless cloth 16a is provided on the outer circumference of the head 16b, and the annular cloth 16a is rotated. There is a way to make it.
Further, as another preferable method, after pulling out one end of the cloth 16a wound in a roll shape from the roll of the cloth 16a, the end portion of the pulled out cloth 16a is held in a cloth winding device (not shown). Then, the cloth 16a is wound by the cloth winding device to move the cloth 16a in the direction of the minor axis of the contact surface 21a included in the cleaning unit 21.
Among the above methods, the method using a cloth winding device is preferable because the cloth 16a in a clean state can be brought into contact with the surface of the roll 100 for a longer period of time.

The major axis of the contact surface 21a included in the cleaning portion 21 of the head 16b is preferably shorter than the length in the width direction of the roll of the cloth 16a. Then, when the foreign matter removing device 16 is brought into contact with the surface of the roll 100, it is preferable that both ends of the cloth 16a are not suppressed by the two cleaning portions 21.
By doing so, when the foreign matter removing device 16 is used wet, the cleaning liquid is less likely to leak from both ends of the cloth 16a.

The cloth 16a is not particularly limited as long as it does not impair the object of the present invention, and an industrial low dust generation cloth can be used without particular limitation. As the cloth having low dust generation, for example, various products of Toraysee (registered trademark) series (manufactured by Toray Industries, Inc.) can be used.

≪Film manufacturing equipment≫
The film manufacturing apparatus includes one or more rolls that convey the film. In such a film manufacturing apparatus, in at least one of the above-mentioned one or more rolls, the above-mentioned foreign matter removing apparatus is arranged in the vicinity of the surface of the roll.
In such a film manufacturing apparatus, when the foreign matter on the surface of the roll is removed, the pressing device included in the foreign matter removing device applies a force to the head also provided in the foreign matter removing device, so that the two cleaning portions are passed through a cloth. And bring it into contact with the surface of the roll. As a result, foreign matter on the surface of the roll is removed by wiping with a cloth.

The foreign matter removing device may be a long type foreign matter removing device in which the length in the width direction of the roll is equal to the width of the roll. When a long type foreign matter removing device is used, it is possible to remove foreign matter on the entire surface of the roll without moving the foreign matter removing device in the width direction of the roll.
The foreign matter removing device may be a short type foreign matter removing device whose length in the width direction of the roll is shorter than the width of the roll.
A short type foreign matter removing device is preferable from the viewpoint of ease of manufacturing, low manufacturing cost, and the like.
However, when a short type foreign matter removing device is used, the foreign matter cannot be removed on the entire surface of the roll unless the foreign matter removing device is moved in the width direction of the roll.

Therefore, it is preferable that the film manufacturing apparatus includes a moving device for moving the foreign matter removing device in the width direction of the roll.
An example of the moving device is a device that moves the foreign matter removing device to an arbitrary position on a rail provided in the width direction of the roll. As another example, an arm that can be expanded and contracted, an arm that has two or more joints, and an arm that has one or more joints and can be expanded and contracted support the foreign matter removing device 2, and the arm can be expanded and contracted. Examples thereof include a device for moving a foreign matter removing device to an arbitrary position by bending a joint at an arbitrary angle.

Since the temperature of the film to be conveyed is high and defects in the film due to foreign matter on the roll surface are likely to occur, the film manufacturing apparatus 1 includes an extruder 10, a die 11, a cast roll 14, and a touch roll 15. A film manufacturing apparatus comprising the above is preferable. The configuration of such a preferable film manufacturing apparatus 1 is schematically shown in FIG.
In such a film manufacturing apparatus 1, a foreign matter removing apparatus 16 is provided near the surface of the cast roll 14 and / or the touch roll 15, preferably near the surface of both the cast roll 14 and the touch roll 15. The foreign matter removing device 16 includes a cloth 16a and a head 16b.
In FIG. 1, a detailed description of the shape of the head 16b is omitted.

When the film manufacturing apparatus 1 is used, first, the thermoplastic resin composition as a film raw material is supplied to the extruder 10, and the thermoplastic resin composition is melted by heating in the extruder 10. The molten thermoplastic resin composition is sent to the die 11 attached to the outlet side of the extruder 10, and is discharged as the film-like melt 13'from the die outlet 12 at the tip of the die in the molten state.
Then, the cast roll 14 and the touch roll 15 sandwich the film-like melt 13'while applying pressure to form a smooth film 13, and convey the film 13.

The cast roll 14 has a function of supporting the film-like melt 13'discharged from the die outlet 12 on the surface and cooling the film-like melt 13'. Further, the cast roll 14 also has a function of sandwiching the film-like melt 13'with the touch roll 15 while applying pressure to form a smooth film. The surface of the cast roll 14 is usually made of a hard material such as metal.
The touch roll 15 has a function of sandwiching the film-like melt 13'with the cast roll 14 while applying pressure to form a smooth film. In the touch roll 15, for example, the surface of an elastic body such as rubber is covered with a metal film.

≪Foreign matter removal method≫
In the foreign matter removing method, the foreign matter removing device 16 described above is used to remove foreign matter on the surface of the roll 100.
In such a foreign matter removing method, the pressing device included in the foreign matter removing device 16 applies a force to the head 16b also provided in the foreign matter removing device 16 to form a band-shaped contact surface 21a provided by the two cleaning portions 21 with a cloth 16a. It includes removing foreign matter on the surface of the roll 100 by contacting it with the surface of the roll 100 through the roll 100.

As described above, the foreign matter is removed while moving at least one of the surface of the roll 100 and the foreign matter removing device 16. Since the structure of the foreign matter removing device 16 can be simplified and the foreign matter removing device 16 can be easily miniaturized, the foreign matter removing device 16 is in a stationary state while being in contact with the surface of the roll 100, and the roll 100 is rotating in an arbitrary direction. It is preferable to remove foreign matter in this state.

≪Film manufacturing method≫
The film manufacturing method is a method of manufacturing a film using the above-mentioned film manufacturing apparatus.
In such a film manufacturing method, a pressing device provided with a foreign matter removing device 16 applies a force to a head 16b also provided with the foreign matter removing device 16 to form a band-shaped contact surface 21a provided by each of the two cleaning portions 21 with a cloth 16a. This includes removing foreign matter on the surface of the roll 100 by bringing it into contact with the surface of the roll 100 via.
In such a film manufacturing method, the foreign matter on the surface of the roll 100 is satisfactorily removed by the foreign matter removing device 16, so that the occurrence of defects due to the foreign matter in the film can be remarkably suppressed.

The method for producing the film is not particularly limited as long as the film is conveyed by the roll and the foreign matter on the surface of the roll is removed by the above method.
As a preferable example of the method for producing a film, the method using the above-mentioned film manufacturing apparatus 1 shown in FIG. 6 can be mentioned.

In such a method, as described above, first, the thermoplastic resin composition as a film raw material is supplied to the extruder 10, and the thermoplastic resin composition is melted by heating in the extruder 10. The molten thermoplastic resin composition is sent to the die 11 attached to the outlet side of the extruder 10, and is discharged as the film-like melt 13'from the die outlet 12 at the tip of the die in the molten state.
Then, the cast roll 14 and the touch roll 15 sandwich the film-like melt 13'while applying pressure to form a smooth film 13.

The extruder 10 used in the above film manufacturing method includes a single-screw extruder, a same-direction meshing twin-screw extruder, a same-direction non-meshing twin-screw extruder, and a different-direction meshing twin-screw extruder. Various extruders such as a non-meshing twin-screw extruder and a multi-screw extruder can be used. Among them, the single-screw extruder is preferable because it has a small amount of resin retention in the extruder, so that it is easy to suppress thermal deterioration of the thermoplastic resin composition during extrusion, and the equipment cost is low. Further, it is preferable to use an extruder having a venting mechanism in order to remove residual volatile matter in the thermoplastic resin composition and heating products in the extruder 10. The size (caliber) of the extruder 10 is selected according to a desired discharge amount.

As the screw used in the single-screw extruder, a screw having a general full-flight configuration with a compression ratio of 2 or more and 3 or less for an extruder without or with a vent can be used, but unmelted material does not remain. A special kneading mechanism (mixing element) may be provided.

The residence time of the thermoplastic resin composition in the extruder 10 is preferably 10 minutes or less, more preferably 5 minutes or less, and particularly preferably 2 from the viewpoint of preventing resin thermal deterioration due to an increase in the residence time. Within minutes.
The residence time depends on the type of extruder 10 and extrusion conditions, but can be shortened by adjusting the material supply amount, L / D, screw rotation speed, screw groove depth, and the like. is there.

The molten thermoplastic resin composition obtained by a melting means such as an extruder 10 is then supplied to the die 11. The molten thermoplastic resin composition is preferably supplied using a gear pump (not shown). By using the gear pump, fluctuations in the discharge amount in the extruder 10 are absorbed, the quantitativeness of the supply is remarkably improved, and it is effective in improving the stability of the film thickness over time.

The molten thermoplastic resin composition quantitatively supplied from the gear pump or the molten thermoplastic resin directly supplied from the extruder 10 is supplied to the die 11 through, for example, a tubular flow path, and is supplied from the die outlet 12 to the film. It is discharged in a shape. It is preferable to provide a filter for removing foreign matter in the flow path from the gear pump to the die 11 or in the flow path from the melting means to the die when the gear pump or the like is not used. As a result, foreign matter contained in the thermoplastic resin composition as a raw material and foreign matter generated by the extruder or gear pump are trapped, and it is easy to reduce the occurrence of foreign matter defects in the film 13. As the filter for removing foreign matter, a screen mesh, a pleated filter, a leaf disc filter or the like can be used.

As the die 11, various structures can be used. As the die 11, a T die is preferable, and for example, a general coat hanger die can be used. With respect to the die 11, it is more preferable that the gap of an arbitrary portion in the width direction of the lip can be adjusted by pushing a bolt or the like as a thickness adjustment mechanism in the width direction.
Further, the thickness of the film 13 can be measured online, and the portion having a deviation from an arbitrary thickness profile can be automatically adjusted, for example, the thickness profile can be automatically adjusted by using a heat-operated bolt. , It is preferable because the change over time can be performed accurately without human intervention.

The residence time of the molten thermoplastic resin composition from the extruder 10 to the die 11 is preferably 15 minutes or less, more preferably 10 minutes or less. From the viewpoint of suppressing thermal deterioration of the thermoplastic resin composition, the shorter the residence time of the molten thermoplastic resin composition is, the better.
When removing foreign substances in the molten thermoplastic resin composition using a leaf disc filter, it is the leaf disc filter that requires the longest residence time from the extruder 10 to the discharge from the die 11. Therefore, in order to achieve the above-mentioned residence time, it is preferable to give priority to the filter size design according to the desired production amount as described above.

Needless to say, the method for producing a film may include various other steps in addition to the steps described above. For example, in film production, if necessary, knurling is performed on the edge of the film, protective film is bonded, both ends of the film are slit and cut to a desired product width, and the film is stretched. May include.

Next, the components of the thermoplastic resin composition preferably used as a raw material for the film will be described.

(Thermoplastic resin)
Examples of the thermoplastic resin which is the main component of the thermoplastic resin composition include a polycarbonate resin, an aromatic vinyl resin and its hydrogen additive, a polyolefin resin, an acrylic resin, a polyester resin, a polyarylate resin, and a polyimide resin. , Polyether sulfone resin, polyamide resin, cellulose resin, polyphenylene oxide resin and the like. Of these, acrylic resins are particularly preferable from the viewpoint of transparency.

The acrylic resin is not particularly limited, but a methacrylic resin containing methyl methacrylate as a monomer component can be used. The content of the structural unit derived from methyl methacrylate in the acrylic resin is preferably 30% by weight or more and 100% by weight or less, more preferably 50% by weight or more and 100% by weight or less, from the viewpoint of obtaining good heat resistance and transparency. , 80% by weight or more and 100% by weight or less is particularly preferable. Among the acrylic resins, heat-resistant acrylic resins are preferable.

As a heat-resistant acrylic resin, for example,
1) Acrylic resin in which an N-substituted maleimide compound is copolymerized as a copolymerization component.
2) Acrylic glutarate anhydride,
3) Acrylic resin having a lactone ring structure,
4) Glutarimide acrylic resin,
5) Acrylic resin containing hydroxyl groups and / or carboxyl groups,
6) An aromatic vinyl-containing acrylic polymer obtained by polymerizing an aromatic vinyl monomer and another monomer copolymerizable therewith (for example, a styrene monomer and another single amount copolymerizable therewith). Styrene-containing acrylic polymer obtained by polymerizing the body)
7) A hydrogenated aromatic vinyl-containing acrylic polymer obtained by partially or wholly hydrogenating the aromatic ring of the resin of 6) above (for example, a styrene monomer and another single amount copolymerizable therewith). Partially hydrogenated styrene-containing acrylic polymer obtained by partially hydrogenating the aromatic ring of the styrene-containing acrylic polymer obtained by polymerizing the body),
8) Acrylic polymer containing a cyclic acid anhydride repeating unit and the like can be mentioned.
A glutarimide acrylic resin can be more preferably used from the viewpoint of heat resistance and optical properties.

(Rubber elastic particles)
Rubber elastic particles are added for the purpose of imparting strength, toughness, and the like.
The resin constituting the rubber elastic particles is not particularly limited, and examples thereof include polymers having a glass transition temperature of less than 20 ° C. Specific examples thereof include butadiene-based crosslinked polymers and (meth) acrylic-based polymers. Examples thereof include rubber-like polymers such as crosslinked polymers and organosiloxane-based crosslinked polymers. Among them, a (meth) acrylic crosslinked polymer (hereinafter, may be simply referred to as “acrylic rubber-like polymer”) is particularly preferable in terms of weather resistance and transparency of the film.

Examples of the acrylic rubber-like polymer include ABS resin rubber and ASA resin rubber. From the viewpoint of transparency and the like, an acrylic graft copolymer containing the acrylic acid ester-based rubber-like polymer shown below (hereinafter referred to as “Acrylic graft copolymer”). , Simply referred to as "acrylic graft copolymer") can be preferably used. The acrylic graft copolymer can be obtained by polymerizing at least one stage or more of a monomer mixture containing a methacrylic acid ester as a main component in the presence of an acrylic acid ester-based rubber-like polymer.

The acrylic acid ester-based rubber-like polymer is a rubber-like polymer containing acrylic acid ester as a main component, and specifically, acrylic acid ester 50% by weight or more and 100% by weight or less, and other copolymerizable vinyls. Monomer mixture consisting of 0% by weight or more and 50% by weight or less of the system monomer (100% by weight) and a polyfunctional monomer having two or more non-conjugated reactive double bonds per molecule 0. It is preferably obtained by polymerizing 05 parts by weight or more and 10 parts by weight or less (relative to 100 parts by weight of the monomer mixture). All the monomers may be mixed and used, or the monomer composition may be changed and used in two or more stages.

When the acrylic acid ester is an ester of acrylic acid and an alcohol represented by R-OH (R is a hydrocarbon group), the number of carbon atoms of the hydrocarbon group as R is 1 in terms of polymerizability and cost. 12 or more is preferable. Examples of such acrylic acid esters include methyl acrylate, ethyl acrylate, propyl acrylate, n-butyl acrylate, 2-butyl acrylate, isobutyl acrylate, benzyl acrylate, cyclohexyl acrylate, and 2 acrylate. -Ethylhexyl, n-octyl acrylate and the like can be mentioned. Two or more of these acrylic acid esters may be used in combination.

As other copolymerizable vinyl-based monomers, (meth) acrylic acid esters are particularly preferable from the viewpoint of weather resistance and transparency, and for example, methyl methacrylate, ethyl methacrylate, propyl methacrylate, n methacrylic acid. -Butyl, 2-butyl methacrylate, isobutyl methacrylate, benzyl methacrylate, cyclohexyl methacrylate, phenoxyethyl (meth) acrylate, phenyl (meth) acrylate and the like can be mentioned. In addition, aromatic vinyls and derivatives thereof, and vinyl cyanide are also preferable, and examples thereof include styrene, methylstyrene, acrylonitrile, and methacrylonitrile. In addition, unsubstituted and / or substituted maleic anhydrides, (meth) acrylamides, vinyl esters, vinylidene halides, (meth) acrylic acids and salts thereof, (hydroxyalkyl) acrylic acid esters and the like can be mentioned.

The polyfunctional monomer may be a commonly used one, for example, allyl methacrylate, allyl acrylate, triallyl cyanurate, triallyl isocyanurate, diallyl phthalate, diallyl malate, divinyl adipate, divinylbenzene, ethylene glycol dimethacrylate. , Diethylene glycol dimethacrylate, triethylene glycol dimethacrylate, trimethylrol propantrimethacrylate, tetramethylolmethanetetramethacrylate, dipropylene glycol dimethacrylate and acrylates thereof and the like can be used. Two or more of these polyfunctional monomers may be used.

Examples of the monomer used for polymerization of a monomer mixture containing a methacrylic acid ester as a main component on an acrylic acid ester-based rubber-like polymer, that is, graft copolymerization, include the above-mentioned methacrylic acid ester and acrylic acid ester. A vinyl-based monomer copolymerizable with the above can be used in the same manner, and a methacrylic acid ester and an acrylic acid ester are preferably used. Methyl methacrylate is preferable from the viewpoint of compatibility with an acrylic resin, and methyl acrylate, ethyl acrylate, and n-butyl acrylate are preferable from the viewpoint of suppressing zipper depolymerization.

The acrylic graft copolymer can be produced by a general emulsion polymerization method. Specifically, a method of continuously polymerizing an acrylic acid ester monomer using an emulsifier in the presence of a water-soluble polymerization initiator can be exemplified.

In the emulsion polymerization method, a usual polymerization initiator can be used. For example, inorganic peroxides such as potassium persulfate and sodium persulfate, organic peroxides such as cumenehydroperoxide and benzoyl peroxide, and oil-soluble initiators such as azobisisobutyronitrile are also used. These may be used alone or in combination of two or more. These initiators are used as ordinary redox-type polymerization initiators in combination with reducing agents such as sodium sulfite, sodium thiosulfate, sodium formaldehyde, sulfoxylate, ascorbic acid, ferrous sulfate and disodium ethylenediamine tetraacetate complex. You may use it.

A chain transfer agent may be used in combination with the polymerization initiator. Examples of the chain transfer agent include alkyl mercaptans having 2 to 20 carbon atoms, mercapto acids, thiophenols, carbon tetrachloride, and the like, and these may be used alone or in combination of two or more.

The emulsifier used in the emulsion polymerization method is not particularly limited, and any ordinary emulsifier for emulsion polymerization can be used. For example, sulfate ester-based surfactants such as sodium alkylsulfate, sulfonate-based surfactants such as sodium alkylbenzene sulphonate, sodium alkylsulfonate, sodium dioctyl sulfosuccinate, sodium alkylphosphates, polyoxyethylene alkyl ethers. Examples thereof include anionic surfactants such as phosphate-based surfactants such as sodium phosphate ester. Further, the sodium salt may be another alkali metal salt such as potassium salt or an ammonium salt. These emulsifiers may be used alone or in combination of two or more. Further, a nonionic surfactant represented by an alkyl-substituted product or an aryl-substituted product of the polyoxyalkylenes or the terminal hydroxyl group thereof may be used or partially used in combination. Among them, a sulfonate-based surfactant or a phosphate-based surfactant is preferable from the viewpoint of polymerization reaction stability and particle-based controllability, and among them, dioctyl sulfosuccinate or polyoxyethylene alkyl ether phosphoric acid. Ester salts can be used more preferably.

(Other ingredients)
An antioxidant, an ultraviolet absorber, an ultraviolet stabilizer, or the like for improving stability against heat or light may be added to the thermoplastic resin composition alone or in combination of two or more.

Hereinafter, the present invention will be described based on examples, but the present invention is not limited to these examples.

[Example 1, Example 2, and Comparative Examples 1 to 4]
The size, material, operating conditions, etc. of the rolls to be cleaned used in Examples 1 and 2 and Comparative Examples 1 to 4 are as follows.
Diameter: 200 mm
Width: 450mm
Surface treatment: HCr plating Surface roughness: 0.2S
Surface temperature: 100 ° C
Rotation speed: 15m / min

In Examples 1 and 2 and Comparative Examples 1 to 4, Toraysee (registered trademark) PK (thickness 0.6 mm, width 95 mm, manufactured by Toray Industries, Inc.) was used as the cloth.
In Examples 1 and 2, the head has a rectangular contact surface whose minor axis width is the width shown in Table 1 and whose major axis width is 80 mm, and whose protrusion height from the support surface is 1 mm. A nylon head having two cleaning portions parallel to the support surface was used. The support surface is a surface that supports the cleaning portion in the surface of the head. The distance between the two cleaning parts in the head was 19 mm. The shape of the head is roughly as shown in FIG.
Further, in Comparative Examples 1 to 4, a head having the same shape as the head used in Examples 1 and 2 is provided except that only one cleaning portion having a band-shaped contact surface is provided in the center of the support surface. Using.

Using the roll, head, and cloth described above, the foreign matter removal performance evaluation and the vibration stability evaluation were performed by the following methods in a state where the cloth was arranged between the head and the roll. The head was arranged so that the direction of the major axis of the strip-shaped contact surface of the cleaning portion was parallel to the width direction of the roll.

<Foreign matter removal performance evaluation>
A protein was used as the foreign substance. As the foreign matter, one that had been screened in advance was used. The number distribution of foreign matter attached to the roll surface for each size is as follows.
50 μm or more and less than 100 μm: 2 pieces 100 μm or more and less than 200 μm: 4 pieces 200 μm or more and less than 500 μm: 2 pieces 500 μm or more: 2 pieces

The above foreign matter was swollen and softened with water, then attached to the roll surface, adapted to the shape of the roll surface, and then dried and fixed to the roll surface.

A foreign matter removing device consisting of a head and a cloth is pressed against a roll with foreign matter rotating at a surface temperature of 100 ° C. and a speed of 15 m / min while the head is pressed at 200 N while the roll makes three rotations. Was removed.
When removing the foreign matter, pure water was supplied to the cloth as a cleaning liquid.
The surface of the roll after the test was observed using a microscope (DG-3x, manufactured by Scarar) to confirm whether or not the foreign matter had been completely removed. When the foreign matter was completely removed, it was judged as ◯, and when the foreign matter was not completely removed, it was judged as x.

<Vibration stability evaluation>
According to the following criteria, the vibration of the foreign matter removing device in the state where the foreign matter removing device was in contact with the rotating roll was evaluated.
◯: No vibration is felt when the foreign matter removing device is touched with a finger, and no vibration noise is confirmed.
X: At least one of the vibration when the foreign matter removing device is touched with a finger and the vibration sound is confirmed.

According to Table 1, the width of the minor axis on the contact surface with the roll is 3 mm or less, and the head has two cleaning portions provided so that the major axes of the two strip-shaped contact surfaces are parallel to each other. It can be seen that good cleaning performance and good vibration stability can be achieved at the same time when the foreign matter on the roll surface is removed by pressing.
On the other hand, from Table 1, when the width of the minor axis of the contact surface of the cleaning portion exceeds 3 mm or the cloth is pressed with a head having one cleaning portion to remove foreign matter on the roll surface. It can be seen that both the cleaning performance and the vibration stability are not good.

[Example 1, Example 3, Example 4, and Comparative Example 5]
The evaluation of the foreign matter removal performance and the evaluation of the vibration stability are performed in the same manner as in the first embodiment, except that the height of the head protruding from the support surface of the cleaning portion is the height shown in Table 2. went. In addition to these evaluations, the contamination with the cleaning liquid was evaluated. In the comparative example, a head having no cleaning unit was used.

<Stainability evaluation>
The surface of the roll after the foreign matter was removed was observed, and the contamination with the cleaning liquid was evaluated according to the following criteria.
◯: No wetting by the cleaning liquid or evaporation marks (watermarks) of the cleaning liquid are observed on the roll surface.
X: At least one of the wetting by the cleaning liquid and the evaporation mark (watermark) of the cleaning liquid is observed on the roll surface.

According to Table 2, a head in which the protrusion height of the cleaning portion from the support surface is 1 mm or more and 5 mm or less, and the two cleaning portions are provided so that the major axes of the contact surfaces are parallel to each other. It can be seen that when the cloth is pressed to remove foreign matter on the roll surface, both good cleaning performance and good vibration stability can be achieved.
However, when the protruding height of the cleaning portion is 5 mm, it can be seen that the roll surface is likely to be contaminated by the cleaning liquid.
On the other hand, from Table 2, when the cloth is pressed by using a head having a protruding height of 0 mm in the cleaning portion to remove foreign substances on the roll surface, the cleaning performance, the vibration stability, and the contamination property are all determined. It turns out that the thighs are not good.

1 Film manufacturing equipment 10 Extruder 11 Die 12 Die outlet 13 Film 13'Film-like melt 14 Cast roll 15 Touch roll 16 Foreign matter removal device 16a Cloth 16b Head 20 Head body 21 Cleaning part 21a Contact surface 21b Convex part 22 Support surface 23 Liquid supply unit 23a Liquid supply path 23b Liquid supply port 100 rolls

Claims (15)

A head for a foreign matter removing device that removes foreign matter adhering to the surface of the roll.
The head comprises two cleaning sections provided in contact with the roll.
The cleaning portion has a strip-shaped contact surface having a major axis and a minor axis.
The width of the minor axis of the contact surface is 3 mm or less.
The two cleaning portions are heads arranged so that the major axis directions of the contact surfaces of the two cleaning portions are parallel to each other. The head includes a head body
The surface of the head body includes a support surface that supports the two cleaning portions.
The head according to claim 1, wherein each of the two cleaning portions is a convex portion provided on the support surface. The head according to claim 2, wherein the protruding height of the convex portion from the support surface is 1 mm or more and 5 mm or less. The head according to any one of claims 1 to 3, which has a liquid supply unit for supplying a cleaning liquid. It has a liquid supply unit that supplies cleaning liquid,
The liquid supply unit includes a liquid supply passage and a liquid supply port.
The liquid supply path is provided in the head body,
The liquid supply port is an end portion of the liquid supply path,
The head according to claim 2 or 3, wherein the liquid supply port is provided between the two cleaning portions on the support surface. The head according to claim 5, wherein the protruding height of the convex portion from the support surface is 1 mm or more and 4 mm or less. A foreign matter removing device for removing foreign matter adhering to the surface of a roll, comprising the head, cloth, and pressing device according to any one of claims 1 to 6.
The cloth is arranged so as to be in contact with the contact surface provided by each of the two cleaning portions.
A foreign matter removing device in which the pressing device applies a force to the head from the cleaning unit side toward the cross side. The foreign matter removing device according to claim 7, wherein the cloth is arranged so as to be movable in the direction of the minor axis of the contact surface. Equipped with a cross take-up device,
The foreign matter removing device according to claim 8, wherein the cloth winding device winds the cloth to move the cloth in the direction of the minor axis of the contact surface. A film manufacturing apparatus comprising one or more rolls for transporting a film.
In at least one of the one or more rolls, one or more foreign matter removing devices according to any one of claims 7 to 9 are arranged in the vicinity of the surface of the roll.
When the pressing device applies a force to the head when removing foreign matter on the surface of the roll, the contact surfaces provided by the two cleaning portions come into contact with the surface of the roll via the cloth. Film manufacturing equipment. The film manufacturing apparatus according to claim 10, further comprising a moving device for moving the foreign matter removing device in the width direction of the roll. The film manufacturing apparatus includes, as the roll, a cast roll and a touch roll.
In the film manufacturing apparatus, a melt of a film-like thermoplastic resin composition is sandwiched between the cast roll and the touch roll and molded into a film while being conveyed.
The film manufacturing apparatus according to claim 10 or 11, wherein one or more of the foreign matter removing devices are arranged in the vicinity of at least one surface of the cast roll and the touch roll. A method for removing foreign matter on the surface of a roll by using the foreign matter removing device according to any one of claims 7 to 9.
A method for removing foreign matter, wherein the pressing device applies a force to the head to bring the contact surfaces of the two cleaning portions into contact with the surface of the roll via the cloth. .. The method for removing foreign matter according to claim 13, wherein the foreign matter is removed while the roll is rotated and the foreign matter removing device is stationary. A film manufacturing method using the film manufacturing apparatus according to any one of claims 10 to 12.
When the pressing device applies a force to the head, the contact surfaces provided by the two cleaning portions are brought into contact with the surface of the roll via the cloth to remove foreign substances on the surface of the roll. A method of manufacturing a film, including.

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