JP5918645B2 - Film production apparatus and production method - Google Patents

Description

  The present invention relates to a film manufacturing apparatus and a manufacturing method for manufacturing a film by melting a resin, extruding it from a die, and bringing it into contact with a metal roll.

  As a method of manufacturing a film applied to various uses such as a packaging film, a magnetic recording medium film, and an optical film, a molten resin formed by melting a thermoplastic resin is extruded from a die into a metal roll. A melt extrusion method is generally used which is produced by contacting, cooling and solidifying.

  This melt extrusion method further includes two methods that differ in the action and combination of the metal rolls used, one of which is a sandwich molding method and the other is a casting molding method.

  Among these, the sandwich molding method is such that two metal rolls (touch roll and cast roll) are arranged on the left and right below the die outlet, and the molten resin is extruded between these two metal rolls. This is a method for producing a film by feeding a molten film formed by being pinched by a roll to one or more cooling rolls arranged on the side of the cast roll, and cooling and solidifying with a cooling roll.

On the other hand, in the casting molding method, one metal roll (cast roll) is disposed below the die outlet, and the molten resin is extruded onto this surface, and one or more cooling rolls disposed on the side of the cast roll are provided. This is a method for producing a film by feeding and cooling solidification with a cooling roll.

  When applying this melt extrusion method, additives derived from lubricants, heat stabilizers, etc., and resin-derived substances such as oligomers are volatilized and released to the surroundings from the molten resin extruded from the die, and this is the surface of the member around the die. Cooling at the surface causes condensation, and there is a fear of falling onto the surface of the metal roll located below the die and soiling the roll surface. Moreover, there is a fear that oligomers and additives ooze out from the molten resin extruded from the die and adhere to the surface of the metal roll and become dirty.

When the molten thermoplastic resin is sandwiched and molded with castings such as oligomers and additives attached to the surface of the metal roll in this way, the filth is transferred to the surface of the molded film, causing dirt and dents, etc. The above defects occur on the surface of the film, leading to deterioration of the film quality.

Therefore, Patent Document 1 discloses a technique related to a forming method using a forming apparatus provided with a cleaning device for wiping the surface of a metal roll.

  The roll cleaning device constituting the film forming apparatus disclosed herein includes a cleaning liquid storage tank for storing a cleaning solvent, a wiping cloth feeding device, a wiping cloth, and a pressing device. A certain amount of the cleaning solvent is dropped from the head portion of the pressing device by a liquid feed pump and dropped onto the wiping cloth. The cleaning solvent soaks into the wiping cloth by a capillary phenomenon, the wiping cloth is pressed against the surface of the forming roll by the pressing portion, and after the surface dirt is wiped off, the wiping cloth is collected by a winding device.

  By the way, when wiping the wiping cloth with a cleaning solvent and pressing it onto the roll surface to wipe the roll surface, keeping the wiping cloth soaked in the cleaning solvent (or wetting with the cleaning solvent) in an appropriate state It is an extremely important factor for sufficient wiping of the roll surface.

  Further, the wiping of the roll surface is generally performed simultaneously with the melt extrusion molding, and the technique disclosed in Patent Document 1 is the same, but in order to guarantee continuous wiping, the roll surface by the wiping cloth is used. It is necessary to replenish the wipe with the reduced amount of the cleaning solvent. More specifically, since a part of the cleaning solvent provided to the wiping cloth volatilizes in the air, it is necessary to provide an appropriate amount of the cleaning solvent to the wiping cloth in consideration of this volatilization amount.

  However, the amount of volatilization varies depending on the temperature conditions and humidity conditions around the die at the time of molding, and therefore the amount of cleaning solvent required varies slightly. Therefore, the appropriate amount of cleaning solvent is actually provided to the wipe as appropriate. Such control is extremely difficult.

  In the molding apparatus disclosed in Patent Document 1, although there is disclosure of the embodiment of the roll cleaning apparatus, there is no description regarding a measure for providing an appropriate amount of cleaning solvent that compensates for the decrease in the wiping process with respect to the wiping cloth. Therefore, as described above, it is difficult to actually provide an appropriate amount of the cleaning solvent to the wiping cloth, and the problem solving means cannot be provided.

JP 2011-126184 A

  The present invention has been made in view of the above problems, and relates to a film manufacturing apparatus and a manufacturing method for manufacturing a film by bringing a molten resin extruded from a die into contact with a metal roll, and cooling and solidifying the metal roll. It aims at providing the manufacturing apparatus and manufacturing method of a film which can provide an appropriate quantity of washing | cleaning solvent with a simple structure and method with respect to the member (wiping cloth) which wipes off the surface directly.

  In order to achieve the above object, a film manufacturing apparatus according to the present invention is configured to bring a molten resin extruded downward from an outlet opened in a die into contact with a rotating metal roll positioned below the outlet, A film manufacturing apparatus for manufacturing a film by cooling and solidifying, wherein the manufacturing apparatus is disposed on a side of the surface of the metal roll and rotates in the same direction as the metal roll, and a wiping roll A wiping cloth that moves between the wiping roll and the metal roll by the rotation of the wiping cloth and moves in a direction opposite to the rotation direction of the metal roll, and the wiping roll is provided on the surface of the wiping roll. A lining material that can hold the cleaning solvent is provided, and at least when the surface of the metal roll is wiped, the cleaning solvent is held in the lining material. And which is intended to wipe the surface of the metal roll by wipes clean solvent is provided from the lining material is performed.

  The film manufacturing apparatus of the present invention is configured such that a wiping roll is rotatably disposed at a position facing the metal roll, and a wiping cloth passes between the wiping roll and the metal roll. It is provided with a cleaning unit adapted to execute the movement of the wiping cloth. In addition, a lining material that can always hold a predetermined amount of cleaning solvent is provided on the surface of the wiping roll, and the cleaning solvent is appropriately provided to the wiping cloth from the lining material that holds the cleaning solvent. An appropriate amount of cleaning solvent can be sequentially provided from the lining material to the wiping cloth without any difficult control for providing the amount of cleaning solvent.

  That is, as in the cleaning device disclosed in Patent Document 1, instead of directly providing a cleaning solvent to the wiping cloth that wipes the surface of the metal roll, a certain amount of cleaning solvent is applied to the lining material provided on the surface of the wiping roll. It is always kept (collected), and a cleaning solvent is provided to the wiping cloth through this lining material (soaked by capillary action). By providing the lining material with a buffer function (in addition to being able to hold a certain amount of cleaning solvent, it is also possible to hold a somewhat larger amount of cleaning solvent and to provide a certain amount of cleaning solvent to other members), the lining A desired amount of cleaning solvent can always be provided to the wipe from the material. For example, when the cleaning solvent contained in the wiping cloth is reduced by wiping the surface of the metal roll, the cleaning solvent is naturally provided from the lining material to the wiping cloth so as to compensate for this reduction.

  Further, instead of simply pressing the wiping cloth against the surface of the forming roll by the pressing portion like the cleaning solvent disclosed in Patent Document 1, it is arranged on the side of the surface of the metal roll and rotates in the same direction as the metal roll. The wiping cloth is moved in the opposite direction to the metal roll with the wiping roll, and the surface of the metal roll is wiped by moving the wiping cloth. Increased dramatically.

  Here, as an embodiment of the cleaning unit, a tank for storing the cleaning solvent, a pump for supplying the cleaning solvent from the tank, a distribution nozzle for distributing the cleaning solvent supplied by the pump in the width direction of the metal roll, and distribution An example may further include a cloth material in which the cleaning solvent is directly dropped from the nozzle, and the cleaning solvent is provided from the cloth material to the lining material.

  The width of the wiping roll disposed on the surface of the wiping roll has a width corresponding to the width of the metal roll, and it is necessary to provide the cleaning solvent from the storage tank so as to correspond to this width. Therefore, in the present embodiment, the cleaning solvent is provided from the distribution nozzle extending in the width direction of the metal roll. In addition to this, the cleaning solvent is not directly supplied from the distribution nozzle to the lining material, but is distributed. The cleaning solvent is provided from the nozzle to the cloth material, and the cleaning solvent is provided from the cloth material to the lining material. By providing the cleaning solvent to the lining material through the cloth material in this way, it becomes possible to provide the cleaning solvent uniformly in the width direction of the lining material in a relatively low-speed manner. As a result, it can be assured that the cleaning solvent is uniformly held in the width direction of the lining material.

  Note that the combination of the pump and the distribution nozzle constituting the cleaning unit has an effect of providing the cleaning solvent uniformly with respect to the width of the metal roll (or the width of the wiping roll). As another form capable of producing the same effect as this, a form in which a multi-channel pump corresponding to the width of the metal roll can be applied, but in this specification, the same effect can be obtained. From the viewpoint, a mode in which a multi-channel pump is applied is also included in the combination of the pump and the distribution nozzle.

  Moreover, it is preferable that the said washing | cleaning unit is further equipped with the press apparatus which pushes at least a wiping roll into a metal roll side.

  By pressing the wiping roll to the metal roll side with a pressing device, the wiping cloth that moves in the opposite direction to the metal roll can be pressed against the surface of the metal roll, and while the wiping cloth moves in the opposite direction to the metal roll, Combined with performing wiping, the wiping effect is further enhanced.

  Also, before the molten resin extruded from the die contacts the metal roll, the amount of cleaning solvent provided to the wipe from the lining material is adjusted so that the cleaning solvent attached to the surface of the metal roll is completely volatilized. It is preferable.

  Examples of the material for the wiping cloth include a non-woven fabric made of rayon excellent in hygroscopicity and water absorption, a non-woven fabric made of rayon and tencel, and a non-woven fabric made of polyester excellent in heat resistance and chemical resistance.

  With regard to the fact that the amount of cleaning solvent taking into account the volatilization amount is provided to the wiping cloth from the lining material, a somewhat larger amount of cleaning solvent is provided to the lining material by the buffer function of the lining material as described above. Even if it is held in a state, a certain amount of cleaning solvent is provided from the lining material to the wipe. This is because the reduction amount of the cleaning solvent contained in the wipe is replenished from the lining material. Further, the cleaning solvent holding ability of the lining material is determined by the material and dimensions of the lining material, and the amount of the cleaning solvent provided to the wiping cloth also varies depending on the pressure for pushing the wiping cloth from the lining material. Therefore, by adjusting the pushing force of the wiping roll by the lining material and the pressing device, the amount of the cleaning solvent provided to the wiping cloth can be adjusted to an appropriate amount including the volatilization amount and the like.

  Here, the lining material can be formed from urethane rubber, a nonwoven fabric, a woolen fabric (so-called towel cloth), etc., and among them, it is verified by the present inventors that a woolen fabric is preferable from the viewpoint of wiping performance and operability. Has been. That is, the lining material made of a spliced fabric has a long time for maintaining the cleaning solvent in a good wet condition (excellent buffer function), and it is not necessary to frequently adjust the supply amount of the cleaning solvent by the pump. Even if the volatilization amount of the cleaning solvent changes due to changes in ambient temperature and humidity, the buffer performance (buffer range) of the woolen fabric does not exceed the buffer performance of ordinary woolen fabrics. If so, even if the amount of cleaning solvent provided by the pump is constant, the amount of cleaning solvent that is finally transferred to the wiping cloth through the lining material is maintained at a substantially uniform amount that does not affect the wiping effect. can do.

  More specifically, the woolen fabric is a pile fabric with a relatively twisted twist, and has a single-sided raised surface and a double-sided raised surface, and is generally made in a high amount to increase water absorption. Further, it can be applied to various uses depending on the twist and density of the yarn.

  Further, according to the verification by the present inventors, when using a woolen fabric as the lining material, the wiping roll should be pushed into the metal roll with a pressing force of 0.09 MPa or less against the metal roll by a pressing device. It has been proven. Even when this surface pressure is small, the oligomer wiping of the surface of the metal roll can be performed cleanly, so even if an unexpected situation such as a foreign object biting occurs between the metal roll and the wiping roll, scratches on the surface of the metal roll It has been found that the wipes can be used with low mechanical strength while reducing the risk of occurrence. From these facts, it has been confirmed that the surface pressure is preferably adjusted to about 0.06 MPa in the range of 0.09 MPa or less. In addition, when urethane rubber was used for the lining material of the wiping roll and the pressing force increased, oligomer kneading occurred at the initial stage of melt extrusion molding, and the result of wiping the surface of the metal roll was not achieved Is obtained. From this verification result, the indentation condition of the wiping roll when using a woolen fabric as the lining material is defined as a surface pressure of 0.09 MPa or less.

  The film production apparatus according to the present invention may be a sandwich molding apparatus included in the melt extrusion method as described above, or may be a casting molding apparatus.

  In the case where the film production apparatus is a sandwich molding apparatus, the metal roll is composed of a touch roll and a cast roll disposed below the die outlet, and a cooling roll disposed on the side of the cast roll. The touch roll and the cast roll are provided with the cleaning unit unique to each.

  On the other hand, when the film production apparatus is an apparatus for casting molding, the metal roll is composed of a cast roll disposed below the die outlet and a cooling roll disposed on the side of the cast roll. The cast roll includes the cleaning unit.

  Further, when the glass transition temperature Tg of the molten resin is 100 ° C. or lower, the surface temperature of the metal roll provided with the cleaning unit is adjusted to Tg (° C.) or lower, and the water content of the cleaning solvent is 10% by mass. It should be adjusted to the following.

  For example, as a molten resin, polyethylene terephthalate (Tg: 70 ° C.) having a glass transition temperature Tg of 100 ° C. or less, polybutylene terephthalate (Tg: 50 ° C.), polyamide (nylon 6, nylon 66) (Tg: 50 ° C.), When a thermoplastic resin such as polyvinyl chloride (Tg: 87 ° C) or ABS (Tg: in the range of 80-100 ° C) is used, the surface temperature at the film peeling position from the metal roll is the glass transition temperature Tg. If it is above, peeling becomes unstable, and film surface defects called peeling marks (stage marks) are likely to occur. In addition, when the water content of the cleaning solvent is high (20% by mass), the solvent volatilization rate becomes slow at a roll temperature of 100 ° C or lower, so that the solvent remaining on the roll surface and the molten resin adhere to each other. It has been confirmed that the wrapping of the resin occurs. In order to solve this problem, the water content of the cleaning solvent is adjusted to 10% by mass or less, and more preferably 5% by mass or less. Since the volatilization rate of the solvent is affected by the surrounding environment at the time of film forming, for example, it may be adjusted to 10% by mass or less in a factory indoor environment at normal temperature and humidity, and the film forming environment is special (low temperature, high In the case of a humid room, the moisture content may be adjusted as appropriate.

  Further, the present invention extends to a film manufacturing method, in which a molten resin extruded downward from an outlet opened in a die is brought into contact with a rotating metal roll positioned below the outlet. And a method for producing a film by cooling and solidifying a molten resin, wherein a wipe is passed between the wiping roll and the metal roll by rotation of the wiping roll rotating in the same direction as the metal roll. It is moved in the direction opposite to the rotation direction of the metal roll, the cleaning solvent held by the lining material on the surface of the wiping roll is provided to the wiping cloth, and the surface of the metal roll is wiped by the wiping cloth. .

  According to the method for producing a film of the present invention, a lining material provided on the surface of the wiping roll is always held (collected) with a certain amount of cleaning solvent, and the cleaning solvent is provided to the wiping cloth via the lining material. By doing so, a desired amount of cleaning solvent can always be provided to the wipe from the lining material by the buffer function of the lining material. Then, a desired amount of cleaning solvent is continuously provided to the wiping cloth, and the wiping cloth is moved in the opposite direction to the metal roll by rotating the wiping roll in the same direction as the metal roll to wipe the surface of the metal roll. It is possible to realize a production method that is highly efficient and has a high wiping effect, and can produce a high-quality film.

  In this manufacturing method, the cleaning solvent is sent by a pump from a tank containing the cleaning solvent, and the sent cleaning solvent is directly dropped onto the cloth material through a distribution nozzle that distributes the cleaning solvent in the width direction of the metal roll. There is a form in which a cleaning solvent is provided from the cloth material to the lining material.

  In the manufacturing method, at least the wiping roll can be pushed into the metal roll side.

  In the manufacturing method, before the molten resin extruded from the die contacts the metal roll, the cleaning solvent provided to the wiping cloth from the lining material so that the cleaning solvent attached to the surface of the metal roll completely volatilizes. The amount of can be adjusted.

  Moreover, in the said manufacturing method, it is preferable that the said lining material consists of a woolen fabric.

  Further, when the lining material is made of a spliced fabric, the wiping roll is preferably pushed into the metal roll with the pressing device with a pressing force of 0.09 MPa or less.

  Further, the manufacturing method is based on sandwich molding, and the metal roll includes a touch roll and a cast roll disposed below the die outlet, and a cooling roll disposed on the side of the cast roll. The surface of the touch roll and the cast roll is wiped off.

  The manufacturing method is based on casting, and the metal roll is composed of a cast roll disposed below the die outlet and a cooling roll disposed on the side of the cast roll. The surface of the cast roll is wiped off.

  Furthermore, when the glass transition temperature Tg of the molten resin in the production method is 100 ° C. or lower, the surface temperature of the metal roll provided with the cleaning unit is adjusted to 100 ° C. or lower, and the moisture contained in the cleaning solvent Is preferably adjusted to 10 mass% or less.

  As can be understood from the above description, according to the film manufacturing apparatus and method of the present invention, the wiping cloth passes between the metal roll and the wiping roll rotatable in the same direction as the metal roll. By rotating the wiping roll, the wiping cloth is moved in the direction opposite to the rotation direction of the metal roll, and a predetermined amount of cleaning solvent is always held by the lining material provided on the surface of the wiping roll. When the cleaning solvent is reduced from the wiping cloth, the appropriate amount of cleaning solvent can be provided to the wiping cloth with a simple structure and method by appropriately providing the reduced amount of cleaning solvent from the lining material. At that time, the surface of the metal roll can be sufficiently wiped off, and a film with excellent quality can be produced.

It is the schematic diagram which showed Embodiment 1 of the manufacturing apparatus of the film of this invention. It is the figure which expanded the II section of FIG. 1, Comprising: It is the schematic diagram explaining the state by which a cleaning solvent is provided in a cleaning unit. It is the schematic diagram which showed Embodiment 2 of the manufacturing apparatus of the film of this invention.

  Embodiments of a film production apparatus and a production method of the present invention will be described below with reference to the drawings. In the illustrated example, the cleaning unit constituting the manufacturing apparatus includes a pressing device. However, when the wiping cloth passes through the gap between the wiping roll and the metal roll, the wiping cloth is desirably narrowed to a predetermined pressure. As long as it is guaranteed that the metal roll is brought into contact with pressure, the cleaning unit may not include a pressing device.

(Embodiment 1 of Film Manufacturing Apparatus and Manufacturing Method)
FIG. 1 is a schematic view showing Embodiment 1 of the film production apparatus of the present invention, and FIG. 2 is an enlarged view of a portion II in FIG. 1, showing a state in which a cleaning solvent is provided in the cleaning unit. It is the schematic diagram demonstrated.

  A manufacturing apparatus 10 shown in the figure is an apparatus for sandwich molding, a die 1 for extruding a molten resin made of a thermoplastic resin, a touch roll 2A, a cast roll 2B, and a cast roll disposed below an outlet 1a of the die 1. It consists mainly of a metal roll 2 (metal roll group) composed of two cooling rolls 2C and 2D disposed on the side of 2B, and cleaning units 8 and 8 specific to the touch roll 2A and the cast roll 2B, respectively. ing. Although illustration is omitted, an extruder such as a twin screw extruder is disposed above the die 1.

  The molten resin m extruded downward from the outlet 1a of the die 1 passes through the surface of the cast roll 2B while being narrowly pressed by the touch roll 2A (rotated in the X1 direction) and the cast roll 2B (rotated in the X2 direction) in a rotating posture. The molten resin m is solidified while being cooled on each surface of the rotating roll 2C (rotated in the X3 direction) and then cooled in the rotating position 2D (rotated in the X4 direction) to produce the film f. The surface of each metal roll is set to a temperature not higher than the glass transition temperature Tg of the molten resin m. In addition to the illustrated example, the number of the cooling rolls may be one form, three or more forms, or a form having a peeling roll for peeling the film produced on the downstream side. Good.

  Here, as the material of the film, polyethylene terephthalate (Tg: 70 ° C), polybutylene terephthalate (Tg: 50 ° C), polyamide (nylon 6, nylon 66) (Tg: 50 ° C), polyvinyl chloride (Tg: 87 And thermoplastic resins such as ABS (Tg: in the range of 80 to 100 ° C.).

  When oligomers and additives contained in these thermoplastic resins adhere to the surface of the metal roll, a cleaning unit 8 is provided on both the touch roll 2A and the cast roll 2B for wiping off these filth from the surface of the metal roll. ing.

  Here, the configuration of the cleaning unit will be described by taking up the cleaning unit 8 on the touch roll 2A side. The contents described below apply to the cleaning unit 8 on the cast roll 2B side as well, and the touch roll 2A can be read as the cast roll 2B to explain the cleaning unit 8 on the cast roll 2B side. is there.

  The wiping roll 3, the feeding reel 4A, and the take-up reel 4B, which are constituent elements of the cleaning unit 8, are rotatable about the unit main body 4C (the wiping roll 3 is in the Y1 direction, the same direction as the rotation direction X1 of the touch roll 2A, the wiping roll) 3 and the supply reel 4A are attached in the Y2 direction), and the rotation of the wiping cloth 7 is adjusted between the wiping roll 3 and the touch roll 2A by the differential shaft 6E for rotation and angle adjustment of the wiping cloth 7. It is made to move in the direction opposite to the rotation direction (Y3 direction). Here, a speed controller or the like can be applied to the rotational drive of the wiping roll 3, and a servo motor or a torque motor can be applied to the rotational drive of the take-up reel 4B or the like.

  A pressing device 5 having a cylinder mechanism or the like is attached to the unit main body 4C, and the unit main body 4C is pushed into the touch roll 2A side with a pressing force P. Note that the pressing device 5 is equipped with a pressure sensor (not shown) that senses the reaction force received during the pressing, and determines whether or not the pressing force of the wiping roll 3 on the touch roll 2A is within a desired range. It may be provided with a feedback control mechanism that can detect and reduce the pushing force by a predetermined amount when out of the range.

  A cleaning solvent is accommodated in a tank 6A, which is a component of the cleaning unit 8, and the cleaning solvent taken out by the pump 6B flows through the tube 6C (in the Z1 direction), and is a distribution nozzle 6D at the tip of the tube 6C. Provided to.

  As shown in FIG. 2, the width S of the distribution nozzle 6D is approximately the same as the width of the wiping roll 3 or the width of the touch roll 2A.

  A number of nozzle holes 6Da are formed in the lower surface of the distribution nozzle 6D, and the cleaning solvent is provided from the nozzle holes 6Da to the cloth material 6F below (Z2 direction).

  The cloth material 6F has the same width as the wiping roll 3, and the cleaning solvent soaked into the cloth material 6F penetrates the wiping roll 3 side, and the cleaning solvent is provided to the wiping roll 3 from the edge of the cloth material 6F. (Z3 direction).

  The wiping roll 3 has an annular lining material 3a on the surface thereof, and a cleaning solvent is provided from the cloth material 6F to the lining material 3a (Z4 direction).

  The lining material 3a can be formed from urethane rubber, non-woven fabric, or a woolen fabric (so-called towel cloth). Among these, a woolen fabric is preferable from the viewpoint of wiping performance and operability. That is, the lining material 3a made of a spliced fabric has a long time for maintaining the cleaning solvent in a good wet condition (excellent buffer function), and there is no need to frequently adjust the cleaning solvent supply amount by the pump 6B. Even if the volatilization amount of the cleaning solvent changes due to changes in ambient temperature and humidity, the buffer performance (buffer range) of the woolen fabric does not exceed the buffer performance of ordinary woolen fabrics. If so, even if the amount of the cleaning solvent provided from the pump 6B is constant, the amount of the cleaning solvent finally transferred to the wiping cloth 7 through the lining material 3a is substantially uniform so as not to affect the wiping effect. Can be maintained in quantity.

  Further, the wiping cloth 7 can be manufactured from a nonwoven fabric made of rayon excellent in moisture absorption and water absorption, a nonwoven fabric made of rayon and tencel, and a nonwoven fabric made of polyester excellent in heat resistance and chemical resistance.

  As the cleaning solvent, ethanol, a solvent in which ethanol (88% ± 0.5%), isopropyl alcohol (4% ± 0.5%) and n-propyl alcohol (4% ± 0.5%) are mixed can be used.

  Before the molten resin m comes into contact with the rotating touch roll 2A by the operation of the manufacturing apparatus 10, the surface of the touch roll 2A is wiped with the cleaning unit 8 so that the surface does not adhere to dirt such as oligomers. The operation of the cleaning unit 8 is executed so as to meet.

  The cleaning solvent held by the lining material 3a on the surface of the wiping roll 3 is provided in a uniform manner as much as possible across the width direction of the wiping cloth 7 that moves while being in contact with the lining material 3a (Z4 direction).

  Since the rotation (X1 direction) of the touch roll 2A and the movement direction (Y3 direction) of the wiping cloth 7 are opposite directions, the wiping effect on the surface of the touch roll 2A by the wiping cloth 7 is high.

  Although the cleaning solvent of the wiping cloth 7 decreases in the process of wiping with the wiping cloth 7, since the lining material 3a that always holds the cleaning solvent is always in contact with the wiping cloth 7, the cleaning solvent The decrease is replenished from the lining material 3a.

  Here, the amount of reduction of the cleaning solvent in the wiping cloth 7 varies depending on not only the time required for wiping but also the ambient temperature and humidity conditions. The desired amount of the wiping cloth in consideration of these ambient conditions. It is extremely difficult to control such that the cleaning solvent is constantly replenished. In this regard, the cleaning unit 8 shown in the figure is difficult because the cleaning solvent that has been reduced for wiping is naturally replenished to the wiping cloth 7 from the lining material 3a that always holds the cleaning solvent. No replenishment control is necessary, and the reduced amount of the cleaning solvent in consideration of the ambient temperature and humidity conditions is replenished as it is from the lining material 3a.

  In addition, in the manufacturing apparatus 10 to show in figure, the blow nozzle 9 is provided in the position of the upstream side rather than the location which the molten resin m falls and contacts with respect to the rotation direction of the touch roll 2A, and it wipes off with the wiping cloth 7. In addition, measures are taken to blow away the cleaning solvent remaining on the surface of the touch roll 2A to promote surface drying.

  In addition, when using a thermoplastic resin having a glass transition temperature Tg of 100 ° C. or lower as described above as a film material, in addition to adjusting the surface temperature of the metal roll 2 to Tg (° C.) or lower. By adjusting the water content of the cleaning solvent to 10% by mass or less, preferably 5% by mass or less, the problem that the molten resin is wound around the surface of the metal roll 2 can be solved.

Furthermore, when a woolen fabric is used for the lining material 3a, it is desirable to adjust the pressing force of the wiping roll 3 against the touch roll 2A by the pressing device 5 to 0.09 MPa or less.
When the pressing force is increased by pressing the wiping roll 3 with the lining material 3a made of urethane rubber, the oligomer is kneaded at the initial stage of the melt extrusion molding, and the surface of the metal roll is not wiped off. This is based on the verification result.

  According to the manufacturing apparatus 10 shown in the figure and a manufacturing method using the same, the wiping cloth 7 is provided between the wiping rolls 3 and 3 and the touch roll 2A and the cast roll 2B that are rotatable in the same direction as the touch roll 2A and the cast roll 2B. With the lining material 3 a provided on the surface of the wiping roll 3, the wiping cloth 7 is moved in the direction opposite to the rotation direction of the touch roll 2 </ b> A and the cast roll 2 </ b> B by rotating the wiping roll 3. A predetermined amount of cleaning solvent is always maintained, and when the cleaning solvent is reduced from the wiping cloth 7 by wiping the surface of the touch roll 2A or the cast roll 2B, the reduced amount of cleaning solvent is appropriately provided from the lining material 3a. Can provide an appropriate amount of cleaning solvent to the wipe 7 with a simple configuration and method. Continuously can perform touch roll 2A and the casting roll 2B sufficient wiping surface, it is possible to produce a superior film f quality have to.

(Embodiment 2 of Film Manufacturing Apparatus and Manufacturing Method)
FIG. 3 is a schematic view showing Embodiment 2 of the film manufacturing apparatus of the present invention. A manufacturing apparatus 10A shown in the figure is an apparatus for casting molding, and includes a die 1 for extruding a molten resin made of a thermoplastic resin, a cast roll 2E disposed below an outlet 1a of the die 1, and a side of the cast roll 2E. Is composed of a metal roll 2 ′ (metal roll group) composed of two cooling rolls 2F and 2G disposed on the side and a cleaning unit 8 disposed on the side of the cast roll 2E.

  After the surface of the cast roll 2E is wiped off by the cleaning unit 8 by the cleaning unit 8 disposed on the side of the cast roll 2E, like the touch roll 2A and the cast roll 2B of the manufacturing apparatus 10, the molten resin m Provision is made and the film f excellent in quality is manufactured.

[Experiments and results on lining materials]
In order to select a suitable material for the lining material, the present inventors produce a lining material using three materials of urethane rubber, non-woven fabric, and woolen fabric (towel cloth), and then wipe the roll with a pressing device. Experiments were conducted with the wiping performance and operability as the evaluation items while changing the pressing force and the like.

Here, as a common condition in the experiments regarding the lining material of each material, the molded film is of type: PET (added with 0.1 wt% antioxidant) and has a thickness of 200 μm. Extrusion equipment conditions include a die width of 1500 mm and extrusion. The machine is a twin screw extruder φ65, the discharge rate is 130 kg / hr, and the extrusion temperature is 260 ° C.
Further, as the forming equipment conditions, the line speed is 6 mpm, the cast roll, the touch roll, and the cooling roll are all mirror-finished with chrome plating, and the heat medium (water) is circulated at a roll temperature of 40 ° C. Furthermore, as a condition of the oligomer cleaning device, the wiping cloth is a non-woven cloth (wiping cloth (trade name: Super Clean)), ethanol is used as a cleaning solvent, and the wiping cloth feed speed is 8 mm / min (3.5 mm / min). Even if it is changed within the range of ~ 12mm / min), the wiping condition does not change. In addition, the wiping roll (width 80 mm) was traversed in the width direction with respect to the roll surface length width 1500 mm, and the traverse speed was 200 mm / min (the wiping situation was not changed even at 400 mm / min).

  From Table 1, when towel cloth (puffed fabric) is applied as the material of the lining material, good results are obtained for both evaluation items of wiping performance and operability. Moreover, it turns out that the appropriate range of the solvent supply amount from a pump is wide by using a towel cloth. Furthermore, it has been found that when this towel cloth is applied, good results regarding the evaluation items can be obtained when the surface pressure is 0.09 MPa or less.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and there are design changes and the like without departing from the gist of the present invention. They are also included in the present invention.

  DESCRIPTION OF SYMBOLS 1 ... Die, 1a ... Outlet, 2, 2 '... Metal roll, 2A ... Touch roll, 2B, 2E ... Cast roll, 2C, 2D, 2F, 2G ... Cooling roll, 3 ... Wiping roll, 3a ... Lining material, 4A ... delivery reel, 4B ... take-up reel, 4C ... main unit, 5 ... pressing device, 6A ... tank, 6B ... pump, 6C ... tube, 6D ... distribution nozzle, 6E ... differential shaft, 6F ... cloth material, 7 ... wipe Cloth, 8 ... Cleaning unit, 9 ... Blow nozzle, 10, 10A ... Manufacturing equipment, m ... Molten resin, f ... Film

Claims (18)

A film manufacturing apparatus for manufacturing a film by bringing a molten resin extruded downward from an outlet opened in a die into contact with a rotating metal roll positioned below the outlet, and cooling and solidifying the molten resin. ,
The manufacturing apparatus includes a wiping roll disposed on a side of the surface of the metal roll and rotating in the same direction as the metal roll, and passing between the wiping roll and the metal roll by rotation of the wiping roll. A cleaning unit further comprising a wiping cloth that moves in a direction opposite to the rotation direction;
The wiping roll is provided with a lining material capable of holding a cleaning solvent on the surface thereof, and at least when the surface of the metal roll is wiped, the cleaning solvent is held in the lining material, and the cleaning solvent is removed from the lining material. An apparatus for producing a film, wherein the surface of the metal roll is wiped by the provided wiping cloth.   The cleaning unit includes a tank for storing the cleaning solvent, a pump for supplying the cleaning solvent from the tank, a distribution nozzle for distributing the cleaning solvent supplied by the pump in the width direction of the metal roll, and the cleaning solvent directly from the distribution nozzle. The film manufacturing apparatus according to claim 1, further comprising a dropped cloth material, wherein a cleaning solvent is provided from the cloth material to the lining material.   The said washing | cleaning unit is a film manufacturing apparatus of Claim 1 or 2 further provided with the press apparatus which pushes at least a wiping roll into the metal roll side.   Before the molten resin extruded from the die contacts the metal roll, the amount of the cleaning solvent provided to the wipe from the lining material is adjusted so that the cleaning solvent attached to the surface of the metal roll is completely volatilized. Item 4. The film production apparatus according to any one of Items 1 to 3.   The apparatus for producing a film according to any one of claims 1 to 4, wherein the lining material is made of a woolen woven fabric. The film manufacturing apparatus according to claim 5 , which is dependent only on claim 4, which is dependent on claim 3, wherein the wiping roll is pushed against the metal roll by the pressing device with a pressing force of 0.09 MPa or less. The film production apparatus is an apparatus for sandwich molding,
The metal roll is composed of a touch roll and a cast roll arranged below the outlet of the die, and a cooling roll arranged on the side of the cast roll,
The film manufacturing apparatus according to claim 1, wherein each of the touch roll and the cast roll includes the cleaning unit unique to the touch roll and the cast roll. The film production apparatus is an apparatus for casting molding,
The metal roll is composed of a cast roll disposed below the outlet of the die, and a cooling roll disposed on the side of the cast roll,
The film production apparatus according to claim 1, wherein a cast roll includes the cleaning unit. When the glass transition temperature Tg of the molten resin is 100 ° C. or less,
The surface temperature of the metal roll provided with the cleaning unit is adjusted to a glass transition temperature Tg or lower, and the water content of the cleaning solvent is adjusted to 10 mass% or lower. Film production equipment. A method for producing a film in which a molten resin extruded downward from an outlet opened in a die is brought into contact with a rotating metal roll located below the outlet, and the molten resin is cooled and solidified to produce a film. ,
With the rotation of the wiping roll rotating in the same direction as the metal roll, the wiping cloth is moved in the opposite direction to the rotation direction of the metal roll through the wiping roll and the metal roll, and the lining material on the surface of the wiping roll is used. The manufacturing method of the film which provides the cleaning solvent hold | maintained to the wiping cloth, and performs wiping off the surface of a metal roll with this wiping cloth.   The cleaning solvent is pumped from the tank that contains the cleaning solvent, and the supplied cleaning solvent is dropped directly onto the cloth material via a distribution nozzle that distributes the cleaning solvent in the width direction of the metal roll. The manufacturing method of the film of Claim 10 which provides a washing | cleaning solvent.   The method for producing a film according to claim 10 or 11, wherein at least the wiping roll is pushed into the metal roll side.   The amount of the cleaning solvent provided to the wipe from the lining material is adjusted so that the cleaning solvent adhering to the surface of the metal roll is completely volatilized before the molten resin extruded from the die contacts the metal roll. The manufacturing method of the film in any one of -12.   The method for producing a film according to any one of claims 10 to 13, wherein the lining material comprises a woolen fabric. Film production method according to claim 14, pushed by the following pressure 0.09MPa roll wiping the metal roll at press pressure equipment. The method for producing the film is by sandwich molding,
The metal roll is composed of a touch roll and a cast roll arranged below the outlet of the die, and a cooling roll arranged on the side of the cast roll,
The manufacturing method of the film in any one of Claims 10-15 which wipes off the surface of a touch roll and a cast roll. The method for producing the film is by casting,
The metal roll is composed of a cast roll disposed below the outlet of the die, and a cooling roll disposed on the side of the cast roll,
The manufacturing method of the film in any one of Claims 10-15 which wipes off the surface of a cast roll. When the glass transition temperature Tg of the molten resin is 100 ° C. or less,
The film according to any one of claims 10 to 17, wherein the surface temperature of the metal roll provided with the cleaning unit is adjusted to a glass transition temperature Tg or lower, and the water content of the cleaning solvent is adjusted to 10 mass% or lower. Manufacturing method.

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