JP6640050B2 - Method for treating porous sheet and method for producing modified sheet - Google Patents

Description

  The present invention relates to a method for treating a porous sheet and a method for producing a modified sheet.

  The graft polymerization apparatus described in Patent Document 1 includes a graft polymerization tank that performs liquid phase graft polymerization of a monomer on a fiber material, and a centrifugal dehydration tank that collects an unreacted monomer liquid retained in the fiber material after the liquid phase graft polymerization. Having. The fiber material after the liquid phase graft polymerization is taken out of the graft polymerization tank and transferred to a centrifugal dehydration tank.

JP 2005-248362 A

  Conventionally, apart from a processing apparatus for processing a porous sheet, an apparatus for removing fluid remaining inside the porous sheet has been required.

  The present invention has been made in view of the above problems, and has as its main object to provide a method for treating a porous sheet, which can efficiently remove a fluid remaining inside a porous sheet in a roll-to-roll processing apparatus. Aim.

In order to solve the above problems, according to one embodiment of the present invention,
Suction core having a suction hole on the outer periphery, between the suction core and another core, to transport a porous sheet and a dense body sheet connected to the porous sheet,
Winding the porous sheet around the outer periphery of the suction core, winding the dense sheet around the outer periphery of the porous sheet,
Fluid remaining inside the porous sheet covered with the dense sheet is sucked into the suction hole,
The fluid is at least one of a processing liquid and air;
The treatment liquid is at least one of a modification treatment liquid that modifies a base sheet that is wound around the another core together with the porous sheet and a cleaning treatment liquid that cleans the inside of the porous sheet. A method for treating a porous sheet is provided.

  According to one aspect of the present invention, there is provided a method for treating a porous sheet, which is capable of efficiently removing a fluid remaining inside a porous sheet in a roll-to-roll processing apparatus.

It is a flowchart which shows the processing method of the porous body sheet by one Embodiment. FIG. 7 is a diagram illustrating a state of the processing apparatus when the mounting of the first core, the second core, and the third core according to the embodiment is completed. FIG. 3 is a sectional view taken along the line III-III in FIG. 2. FIG. 3 is a diagram illustrating a state of the processing device subsequent to FIG. 2 and illustrating a state of the processing device when the mounting of the fourth core is completed. FIG. 5 is a sectional view taken along line VV of FIG. 4. FIG. 5 is a diagram illustrating a state of the processing apparatus subsequent to FIG. 4, illustrating a state of the processing apparatus when winding of the base sheet around the first core is completed. FIG. 7 is a sectional view taken along the line VII-VII of FIG. 6. FIG. 7 is a diagram illustrating a state of the processing apparatus subsequent to FIG. 6, illustrating a state of the processing apparatus when winding of the base sheet around the third core is completed. FIG. 9 is a sectional view taken along line IX-IX in FIG. 8. FIG. 1 is a block diagram illustrating a processing device according to an embodiment. It is a figure which shows the state of the processing apparatus when the winding of the porous body sheet | seat to a 1st core by a modification is completed. FIG. 12 is a diagram illustrating a state of the processing apparatus when winding of the porous sheet of FIG. 11 around a second core is completed.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. In the drawings, the same or corresponding components are denoted by the same or corresponding reference numerals, and description thereof is omitted.

[Processing method of porous sheet]
FIG. 1 is a flowchart illustrating a method for processing a porous sheet according to an embodiment. The method for treating the porous sheet is not limited to the method shown in FIG. For example, the processing method of the porous sheet may have only some of the steps shown in FIG. The order of the plurality of steps shown in FIG. 1 is not particularly limited.

  First, in step S11 shown in FIG. 1, the first to fourth cores 21 to 24 are mounted. Step S11 will be described with reference to FIGS. 2 and 4, the first storage tank 31 and the second storage tank 32 are cut away. The same applies to FIG. 6 and FIG.

  FIG. 2 is a diagram illustrating a state of the processing apparatus when the mounting of the first core, the second core, and the third core according to the embodiment is completed.

  The first core 21 is detachable from the processing device 30, and the base sheet 10 has been wound before being attached to the processing device 30. After the mounting of the first core 21, one end 10 a in the longitudinal direction of the base sheet 10 is connected to the third core 23.

  In the present embodiment, the base sheet 10 is dense, but may be porous. As the porous material, for example, a net, a woven fabric, a nonwoven fabric, or the like is used. The material of the base sheet 10 is appropriately selected according to the content of the processing of the base sheet 10.

  The second core 22 is detachable from the processing device 30, and the first core sheet 11 and the first dense body sheet 13 connected to the first porous body sheet 11 are attached in this order before being attached to the processing device 30. It has been wound up. After the second core 22 is attached, the leading end of the first dense body sheet 13 is connected to the third core 23.

  The first porous body sheet 11 holds the first processing liquid 41 (see FIGS. 6 and 8). As the first porous sheet 11, for example, a net, a woven fabric, a nonwoven fabric, or the like is used. The material of the first porous sheet 11 may be the same as or different from the material of the base sheet 10. The material of the first porous sheet 11 is appropriately selected according to the content of the treatment.

  FIG. 3 is a sectional view taken along the line III-III in FIG. As shown in FIG. 3, the second core 22 is a suction core having a suction hole 22a on the outer periphery. The first porous sheet 11 is wound around the outer periphery of the second core 22, and the first dense sheet 13 is wound around the outer periphery of the first porous sheet 11. The first dense body sheet 13 extends at least once around the outer periphery of the first porous body sheet 11.

  The first dense body sheet 13 may have any air permeability smaller than that of the first porous body sheet 11. The width of the first dense body sheet 13 is the same as the width of the first porous body sheet 11 in FIG. 3, but may be larger or smaller than the width of the first porous body sheet 11.

  After that, the processing device 30 unwinds the base sheet 10 wound around the first core 21 and the first porous sheet 11 wound around the second core 22, and as shown in FIG. It is wound on the three cores 23.

  FIG. 4 is a diagram illustrating a state of the processing device subsequent to FIG. 2, and is a diagram illustrating a state of the processing device when the mounting of the fourth core is completed.

  The fourth core 24 is detachable from the processing apparatus 30, and the second core sheet 12 and the second dense body sheet 14 connected to the second porous body sheet 12 in this order before being attached to the processing apparatus 30. It has been wound up. After the mounting of the fourth core 24, the distal end of the second dense body sheet 14 is connected to the first core 21.

  The second porous sheet 12 holds the second processing liquid 42 (see FIGS. 6 and 8). As the second porous sheet 12, the same as the first porous sheet 11 is used.

  FIG. 5 is a sectional view taken along the line VV of FIG. As shown in FIG. 5, the fourth core 24 is a suction core having a suction hole 24a on the outer periphery. The second porous sheet 12 is wound around the outer periphery of the fourth core 24, and the second dense sheet 14 is wound around the outer periphery of the second porous sheet 12. The second dense body sheet 14 extends at least once around the outer periphery of the second porous body sheet 12.

  The second dense body sheet 14 only needs to have a lower air permeability than the second porous body sheet 12. The width of the second dense body sheet 14 is the same as the width of the second porous body sheet 12 in FIG. 5, but may be larger or smaller than the width of the second porous body sheet 12.

  In step S12 shown in FIG. 1, an inert gas such as a nitrogen gas is continuously introduced into the processing device 30, and air inside the processing device 30 is pushed out. Thereby, the inside of the processing apparatus 30 is filled with the inert gas.

  In step S13 shown in FIG. 1, air remaining inside the first porous sheet 11 and the second porous sheet 12 is sucked. Step S13 will be described with reference to FIGS. 2 to 5 again.

  For example, the processing device 30 sucks air remaining inside the second porous sheet 12 covered with the second dense sheet 14 into the suction holes 24a of the fourth core 24 as shown in FIG. Replace with inert gas. Thereby, the polymerization efficiency of the graft polymerization described later and the introduction efficiency of the ion exchange group can be improved.

  A suction source such as a pump is connected to the fourth core 24. The suction source sucks the fluid remaining inside the second porous sheet 12 through the suction hole 24a of the fourth core 24. At this time, since the second dense body sheet 14 covers the outer periphery of the second porous body sheet 12, the fluid remaining inside the second porous body sheet 12 can be efficiently sucked.

  Further, the processing device 30 sucks air remaining inside the first porous sheet 11 covered with the first dense sheet 13 into the suction holes 22a of the second core 22, as shown in FIG. Replace with inert gas. Thereby, the polymerization efficiency of the graft polymerization described later and the introduction efficiency of the ion exchange group can be improved.

  A suction source such as a pump is connected to the second core 22. The suction source sucks the fluid remaining inside the first porous sheet 11 through the suction holes 22a of the second core 22. At this time, since the first dense body sheet 13 covers the outer periphery of the first porous body sheet 11, the fluid remaining inside the first porous body sheet 11 can be efficiently sucked.

  Thereafter, the processing device 30 unwinds the base sheet 10 wound around the third core 23 and the second porous sheet 12 wound around the fourth core 24, and as shown in FIG. It is superposed on one core 21 and wound.

  In step S14 shown in FIG. 1, liquid storage of the reforming processing liquid as the first processing liquid 41 and the second processing liquid 42 is performed. The modification treatment liquid is for modifying the base sheet 10. Here, “modification” refers to improving the composition and / or properties of the material of the base sheet 10. Step S14 will be described with reference to FIG.

  FIG. 6 is a diagram illustrating a state of the processing apparatus subsequent to FIG. 4 and illustrating a state of the processing apparatus when the winding of the base sheet onto the first core is completed. In addition, although the liquid storage of the reforming treatment liquid of the present embodiment is performed in the state of FIG. 6, it may be performed in the state of FIG.

  The processing device 30 stores the first processing liquid 41 in the first storage tank 31 installed immediately below the second core 22. The lower part of the roll of the first porous sheet 11 wound on the second core 22 is immersed in the first treatment liquid 41. It is sufficient that at least a part of the scroll of the first porous sheet 11 is immersed in the first treatment liquid 41, and the whole may be immersed in the first treatment liquid 41.

  The first storage tank 31 is connected to a supply pipe for supplying the first processing liquid 41 to the first storage tank 31 and a discharge pipe for discharging the first processing liquid 41 from the first storage tank 31. A plurality of types of the first processing liquid 41 may be prepared, and the first processing liquid 41 may be properly used depending on the situation.

  Further, the processing device 30 stores the second processing liquid 42 inside the second storage tank 32 installed directly below the fourth core 24. The lower part of the roll of the second porous sheet 12 wound around the fourth core 24 is immersed in the second treatment liquid 42. It is sufficient that at least a part of the scroll of the second porous sheet 12 is immersed in the second processing liquid 42, and the whole may be immersed in the second processing liquid 42.

  The second storage tank 32 is connected to a supply pipe for supplying the second processing liquid 42 to the second storage tank 32 and a discharge pipe for discharging the second processing liquid 42 from the second storage tank 32. A plurality of types of the second processing liquid 42 may be prepared, and may be properly used depending on the situation.

  In the present embodiment, the first processing liquid 41 and the second processing liquid 42 perform the same processing on the same base sheet 10, but may perform different processing on the same base sheet 10. Good. When the second processing liquid 42 and the first processing liquid 41 are the same, the second storage tank 32 and the first storage tank 31 may be integrated.

  The first treatment liquid 41 and the second treatment liquid 42 may be modification treatment liquids for modifying the base sheet 10. Examples of the reforming treatment liquid include a liquid in which a monomer is graft-polymerized on the base sheet 10, a liquid in which an ion exchange group is introduced into the base sheet 10, and the like.

  The base sheet 10 undergoes a dimensional change by being modified. On the other hand, since the first porous body sheet 11 and the second porous body sheet 12 are not modified, there is almost no dimensional change. Therefore, the dimensional change rate of the first porous sheet 11 is smaller than the dimensional change rate of the base sheet 10.

  In step S15 shown in FIG. 1, the base sheet 10 is reciprocated. Step S15 will be described with reference to FIGS. 7 to 9 in addition to FIG. FIG. 7 is a sectional view taken along line VII-VII of FIG. FIG. 8 is a diagram illustrating a state of the processing apparatus subsequent to FIG. 6, and is a view illustrating a state of the processing apparatus when the winding of the base sheet around the third core is completed. FIG. 9 is a sectional view taken along line IX-IX in FIG.

  The processing device 30 shifts the state from the state of FIG. 6 or 7 to the state of FIG. 8 or 9. Specifically, the processing device 30 unwinds the base sheet 10 wound around the first core 21 and the first porous sheet 11 wound around the second core 22, respectively. 23 and wound up.

  The base sheet 10 and the first porous body sheet 11 wound around the third core 23 are alternately overlapped as shown in FIG. Therefore, the base sheet 10 can be processed by the first processing liquid 41 held by the first porous body sheet 11.

  Since this processing method uses a roll-to-roll technique, the base sheet 10 can be processed continuously and in large quantities. In addition, since the first porous body sheet 11 functions as a holding layer for holding the first processing liquid 41, processing unevenness can be reduced, the use efficiency of the first processing liquid 41 can be improved, and the use of the first processing liquid 41 can be improved. The amount can be reduced.

  By the way, as the processing of the base sheet 10 with the first processing liquid 41 progresses gradually, the dimensions of the base sheet 10 gradually change.

  Then, in order to suppress a trouble (for example, wrinkles or tightening) due to a dimensional change of the base sheet 10, the processing device 30 shifts the state from the state of FIGS. 8 and 9 to the state of FIGS. Specifically, the processing device 30 unwinds the base sheet 10 and the first porous sheet 11 wound on the third core 23 and winds the first porous sheet 11 around the second core 22. At the same time, the base sheet 10 is wound around the first core 21. Since the base sheet 10 has a dimensional change rate different from that of the first porous sheet 11, it is wound around a core different from that of the first porous sheet 11.

  At this time, the processing device 30 unwinds the second porous sheet 12 wound around the fourth core 24, and removes the second porous sheet 12 and the base sheet 10 as shown in FIG. 6 and FIG. It is superposed on one core 21 and wound. Due to the irregularities on the surface of the second porous sheet 12, slippage during winding of the base sheet 10 can be suppressed. Further, the base sheet 10 can be processed by the second processing liquid 42 held in the second porous body sheet 12.

  Since this processing method uses a roll-to-roll technique, the base sheet 10 can be processed continuously and in large quantities. Further, since the second porous body sheet 12 functions as a holding layer for holding the second processing liquid 42, processing unevenness can be reduced, the use efficiency of the second processing liquid 42 can be improved, and the use of the second processing liquid 42 can be improved. The amount can be reduced.

  By the way, as the processing of the base sheet 10 by the second processing liquid 42 progresses gradually, the dimensions of the base sheet 10 gradually change.

  Then, in order to suppress the trouble due to the dimensional change of the base sheet 10, the processing device 30 may further shift the state from the state of FIG. 6 or 7 to the state of FIG. 8 or FIG. Specifically, the processing apparatus 30 unwinds the base sheet 10 and the second porous sheet 12 wound on the first core 21 and winds the second porous sheet 12 on the fourth core 24. At the same time, the base sheet 10 is wound around the third core 23. Since the base sheet 10 has a dimensional change rate different from that of the second porous sheet 12, it is wound around a core different from that of the second porous sheet 12.

  At this time, the processing device 30 unwinds the first porous body sheet 11 wound around the second core 22, and removes the first porous body sheet 11 and the base material sheet 10 as shown in FIGS. 8 and 9. It is wound on the three cores 23. The unevenness of the surface of the first porous sheet 11 can suppress slippage of the base sheet 10 during winding. Further, the base sheet 10 can be processed by the first processing liquid 41 held in the first porous body sheet 11. As the processing of the base sheet 10 progresses gradually, the dimensions of the base sheet 10 gradually change.

  Thereafter, the processing device 30 may repeatedly shift the state between the state of FIG. 8 and the state of FIG.

  As described above, the processing apparatus 30 may repeat the operation of unwinding the substrate sheet 10 wound around the first core 21, winding it around the third core 23, and winding it again around the first core 21 a plurality of times. . The processing of the base sheet 10 can be advanced, and the occurrence of problems due to a dimensional change of the base sheet 10 can be suppressed.

  During this time, the processing apparatus 30 may replenish the first porous sheet 11 with the first processing liquid 41 after being unwound from the third core 23 and before being wound up again by the third core 23. . Thereby, the concentration of the effective component of the first treatment liquid 41 contained in the first porous sheet 11 can be recovered, and the treatment of the base sheet 10 can be promoted.

  The processing apparatus 30 may supply (including replenishment) the first processing liquid 41 to the first porous sheet 11 at a position where the first porous sheet 11 is separated from the base sheet 10. The supply of the first treatment liquid 41 to the base sheet 10 can be performed only through the first porous body sheet 11 without passing through the base sheet 10.

  Note that the first processing liquid 41 of the present embodiment is stored in the first storage tank 31 installed directly below the second core 22, but the supply location and the supply method of the first processing liquid 41 are particularly Not limited. For example, the first storage tank 31 may be installed in the middle of the transport path of the first porous sheet 11 (the transport path between the second core 22 and the third core 23). Further, instead of the first storage tank 31 that stores the first processing liquid 41, a spray or the like that sprays the first processing liquid 41 may be used.

  Further, the processing device 30 may repeat a plurality of times of unwinding the base sheet 10 wound around the third core 23, winding up the first core 21, and winding up the third core 23 again. The processing of the base sheet 10 can be advanced, and the occurrence of problems due to a dimensional change of the base sheet 10 can be suppressed.

  During this time, the processing apparatus 30 may replenish the second porous sheet 12 with the second processing liquid 42 after being unwound from the first core 21 and before being wound again on the first core 21. . Thereby, the concentration of the active ingredient of the second treatment liquid 42 contained in the second porous sheet 12 can be recovered, and the treatment of the base sheet 10 can be promoted.

  The processing apparatus 30 may supply (including replenishment) the second processing liquid 42 to the second porous sheet 12 at a position where the second porous sheet 12 is separated from the base sheet 10. The supply of the second treatment liquid 42 to the base sheet 10 can be performed only through the second porous sheet 12 without passing through the base sheet 10.

  Note that the second processing liquid 42 of the present embodiment is stored in the second storage tank 32 installed immediately below the fourth core 24, but the supply place and the supply method of the second processing liquid 42 are particularly Not limited. For example, the second storage tank 32 may be provided in the middle of the transport path of the second porous sheet 12 (the transport path between the fourth core 24 and the first core 21). Further, instead of the second storage tank 32 for storing the second processing liquid 42, a spray or the like for spraying the second processing liquid 42 may be used.

  The processing apparatus 30 embraces the base sheet 10 separated from the first porous sheet 11 and the second porous sheet 12 between the third core 23 and the first core 21 on the expander roll 33, A tension may be applied to the base sheet 10 in the width direction. Wrinkles and shrinkage of the base sheet 10 can be reduced. Since the base sheet 10 has a dimensional change rate different from that of the first porous sheet 11 and the second porous sheet 12, the base sheet 10 is held alone by the expander roll 33.

  In the present embodiment, when modifying the base material sheet 10, the first porous material sheet 11 and the second porous material sheet 12 are not modified, but may be modified. In this case, the dimensions of the first porous sheet 11 and the second porous sheet 12 also change.

  Therefore, by sandwiching the first porous sheet 11 separated from the base sheet 10 on an expander roll between the third core 23 and the second core 22, the width of the first porous sheet 11 in the width direction with respect to the first porous sheet 11 is increased. Tension may be applied.

  Similarly, between the first core 21 and the fourth core 24, the second porous body sheet 12 separated from the base sheet 10 is held by an expander roll, so that the second porous body sheet 12 is moved in the width direction with respect to the second porous body sheet 12. May be tensioned.

  The expander roll 33 may be a general one, for example, a rubber cord roll or the like. The rubber cord roll has a plurality of rubber cords parallel to the rotation center line at intervals around the rotation center line. The plurality of elastic cords are independently expanded and contracted with the rotation. Each rubber cord gradually expands while in contact with the base sheet 10 and contracts when separated from the base sheet 10. Note that the rubber cord roll can be used for correcting meandering of the base sheet 10.

  The expander roll 33 may also serve as a dancer roll for controlling the tension acting on the base sheet 10 in the longitudinal direction. The dancer roll may be provided separately from the expander roll 33.

  The dancer arm 34 has one end 34a to which a dancer roll is attached and another end 34b to which a counterbalance is attached, and is swingable about a fulcrum 34c provided between both ends 34a, 34b. . By controlling the rotation speed of the first core 21 and the rotation speed of the third core 23 so that the position of the dancer roll is constant, the tension acting on the base sheet 10 in the longitudinal direction can be controlled to be constant. The position of the dancer roll can be detected by, for example, a displacement sensor 35 (see FIG. 10).

  The processing device 30 applies a tension T1 acting on the base sheet 10 in the longitudinal direction between the third core 23 and the first core 21 to the first porous body between the third core 23 and the second core 22. The control may be made smaller than the tension T2 acting on the sheet 11 in the longitudinal direction. Further, the processing device 30 applies a tension T1 acting on the base sheet 10 in the longitudinal direction between the third core 23 and the first core 21 to the second tension between the fourth core 24 and the first core 21. The tension may be controlled to be smaller than the tension T3 acting on the porous sheet 12 in the longitudinal direction. Unintended deformation of the base sheet 10 can be suppressed.

  FIG. 10 is a block diagram illustrating a processing device according to an embodiment. The processing device 30 includes a first motor 51, a second motor 52, a third motor 53, and a fourth motor 54. The first motor 51 rotates the first core 21, the second motor 52 rotates the second core 22, the third motor 53 rotates the third core 23, and the fourth motor 54 rotates the fourth core 24. Further, the processing device 30 includes a controller 60 that controls the first motor 51, the second motor 52, the third motor 53, and the fourth motor 54.

  The controller 60 has a CPU (Central Processing Unit) 61, a storage medium 62 such as a memory, an input interface 63, and an output interface 64. The controller 60 performs various controls by causing the CPU 61 to execute a program stored in the storage medium 62. Further, the controller 60 receives a signal from outside through the input interface 63 and transmits a signal outside through the output interface 64.

  The controller 60 controls the first motor 51, the second motor 52, the third motor 53, and the fourth motor 54 based on the detection results of various detectors such as the displacement sensor 35. As the various detectors, in addition to the displacement sensor 35, for example, an encoder 71 that detects the rotation speed of the first motor 51, an encoder 73 that detects the rotation speed of the third motor 53, and the like are used.

  For example, the controller 60 controls the tension T1 acting on the base sheet 10 in the longitudinal direction by controlling the first motor 51 and the third motor 53 based on the detection results of the encoders 71 and 73 and the displacement sensor 35. .

  Further, the controller 60 calculates the outer diameter of the roll wound around the third core 23 from the thickness of the base sheet 10, the thickness of the first porous body sheet 11, and the rotation amount of the third core 23, and calculates the outer diameter. By controlling the second motor 52 based on the diameter and the target tension, the tension T2 acting on the first porous sheet 11 in the longitudinal direction is controlled.

  In addition, the controller 60 calculates the outer diameter of the roll wound around the first core 21 from the thickness of the base sheet 10, the thickness of the second porous body sheet 12, and the rotation amount of the first core 21, By controlling the fourth motor 54 based on the diameter and the target tension, the tension T3 acting on the second porous sheet 12 in the longitudinal direction is controlled.

  In order to prevent the elapsed time from being wound around the third core 23 to being unwound from the third core 23 from the end near the third core 23 among the both ends of the base sheet 10, the base time should not exceed the upper limit. The conveyance speed of the material sheet 10 and the stop time in the state of FIG. 8 are set. The maximum dimensional change rate of the base sheet 10 after being wound around the third core 23 until it is unwound from the third core 23 can be kept within an allowable range. The stop time in the state of FIG. 8 may be zero.

  Similarly, the elapsed time from when the end near the first core 21 of the both ends of the base sheet 10 is wound around the first core 21 to when it is unwound from the first core 21 does not exceed the upper limit. Next, the transport speed of the base sheet 10 and the stop time in the state of FIG. 6 are set. The maximum dimensional change rate of the base sheet 10 from when it is wound on the first core 21 to when it is unwound from the first core 21 can be kept within an allowable range. The stop time in the state of FIG. 6 may be zero.

  The relationship between the dimensional change rate of the base sheet 10 and the elapsed time is obtained in advance by a test or the like. In the test, for example, a square sheet of 100 mm square having the same material and the same thickness as the base sheet 10 is immersed in the first processing liquid 41 or the second processing liquid 42, taken out of the processing liquid at predetermined time intervals, and sized. Measure.

  The maximum dimensional change rate of the base sheet 10 after being wound on the first core 21 or the third core 23 until it is unwound is, for example, −1.0% to 1.0%, preferably −0.3%. % To 0.3%. An upper limit of the elapsed time is set based on the allowable range.

  The processing apparatus 30 may end the processing of the base sheet 10 in either the state of FIG. 6 or the state of FIG.

  In step S16 shown in FIG. 1, the reforming processing liquid as the first processing liquid 41 or the second processing liquid 42 is drained. Thereby, the state of the processing device 30 returns to the state of FIG. 2 or the state of FIG.

  In step S17 shown in FIG. 1, the reforming treatment liquid remaining inside the first porous sheet 11 and the second porous sheet 12 is suctioned. The suction of the reforming treatment liquid is performed in the same manner as the suction of air.

  For example, as shown in FIG. 5, the processing device 30 sucks the reforming treatment liquid remaining inside the second porous sheet 12 covered with the second dense body sheet 14 into the suction hole 24 a of the fourth core 24. And replace it with an inert gas. This can improve the efficiency of replacement with the cleaning treatment liquid described below.

  Further, as shown in FIG. 3, the processing apparatus 30 sucks the reforming treatment liquid remaining inside the first porous sheet 11 covered with the first dense sheet 13 into the suction hole 22 a of the second core 22. And replace it with an inert gas. This can improve the efficiency of replacement with the cleaning treatment liquid described below.

  In step S18 shown in FIG. 1, the cleaning processing liquid as the first processing liquid 41 and the second processing liquid 42 is stored. The cleaning treatment liquid is for cleaning the first porous sheet 11, the second porous sheet 12, and the base sheet 10. The reservoir of the cleaning treatment liquid is performed in the same manner as the reservoir of the reforming treatment liquid.

  In step S19 shown in FIG. 1, the base sheet 10 is reciprocated. During this time, as shown in FIGS. 6 and 7, the processing apparatus 30 winds the second porous sheet 12 and the base sheet 10 so as to overlap the first core 21, and performs the cleaning process held by the second porous sheet 12. The base sheet 10 is washed with the liquid. Further, the processing apparatus 30 overlaps and winds the first porous sheet 11 and the base sheet 10 on the third core 23 as shown in FIGS. 8 and 9, and performs the cleaning process held by the first porous sheet 11. The base sheet 10 is washed with the liquid.

  In step S20 shown in FIG. 1, the cleaning processing liquid as the first processing liquid 41 and the second processing liquid 42 is drained. Thereby, the state of the processing device 30 returns to the state of FIG. 2 or the state of FIG.

  In the following step S21, the cleaning treatment liquid remaining inside the first porous sheet 11 and the second porous sheet 12 is suctioned. The suction of the cleaning treatment liquid is performed in the same manner as the suction of the reforming treatment liquid.

  For example, as shown in FIG. 5, the processing device 30 sucks the cleaning treatment liquid remaining inside the second porous sheet 12 covered with the second dense sheet 14 into the suction hole 24 a of the fourth core 24. And replace with gas for drying. The drying gas is an inert gas in the present embodiment, but may be dry air or the like. Thereby, the drying efficiency can be improved.

  Further, as shown in FIG. 3, the processing apparatus 30 sucks the cleaning liquid remaining inside the first porous sheet 11 covered with the first dense sheet 13 into the suction holes 22 a of the second core 22. Then, it is replaced with a drying gas (for example, an inert gas). Thereby, the drying efficiency can be improved.

  Note that the processing device 30 may repeat Steps S18 to S21 illustrated in FIG. 1 a plurality of times. At that time, the type of the cleaning treatment liquid may be changed on the way.

  Thereafter, the base sheet 10 is wound around the first core 21 or the third core 23 separately from the first porous sheet 11 and the second porous sheet 12, and is carried out of the processing apparatus 30. Thereby, a modified sheet obtained by modifying the base sheet 10 is obtained.

  The base sheet 10 is carried out of the processing device 30 separately from the first porous sheet 11 and the second porous sheet 12, and is wound together with the first porous sheet 11 or the second porous sheet 12. It may be taken out and carried out of the processing device 30.

[Method for producing modified sheet]
The method for treating a porous sheet according to the above embodiment may be used for modifying the base material sheet 10, and may be used, for example, in at least one of the following steps (1) and (2).

  The step (1) is a step of graft-polymerizing a monomer onto the base sheet 10. Examples of the base sheet 10 include polyolefins such as polyethylene and polypropylene, halogenated polyolefins such as polyvinyl chloride, polytetrafluoroethylene (PTFE) and vinyl chloride, ethylene-tetrafluoroethylene copolymer, and ethylene-vinyl alcohol copolymer. A material containing an olefin-halogenated olefin copolymer such as a polymer (EVA) or the like and having radicals generated by irradiation with radiation may be used. As the first processing liquid 41 and the second processing liquid 42, for example, a monomer liquid containing a monomer such as styrene and a solvent such as xylene is used. Examples of the solvent include hydrocarbons (benzene, xylene, toluene, hexane, etc.), alcohols (methanol, ethanol, isopropyl alcohol, etc.), ketones (acetone, methyl isopropyl ketone, cyclohexane, etc.), ethers (dioxane, tetrahydrofuran, etc.), esters ( Ethyl acetate, butyl acetate, etc.), and nitrogen-containing compounds (isopropylamine, diethanolamine, N-methylformamide, N, N-dimethylformamide, etc.). According to the above step (1), a graft polymerization base material is obtained.

  The step (2) is a step of introducing an ion exchange group into the base sheet 10. As the base sheet 10, a sheet obtained by graft-polymerizing a monomer having a group that can be converted into an ion exchange group as a monomer in the above step (1) may be used. Examples of the monomer having a group that can be converted into an ion exchange group include acrylonitrile, acrolein, vinylpyridine, styrene, chloromethylstyrene, glycidyl methacrylate, and the like. A monomer having a group that can be converted into an ion exchange group is introduced into the base sheet 10 by graft polymerization, and then a sulfonating agent is reacted to introduce a sulfone group, or an amino group is reacted to react with an aminating agent. And the like, to obtain an ion exchange group. As the first processing liquid 41 and the second processing liquid 42, for example, a sulfonating agent such as sodium sulfite and concentrated sulfuric acid, and an aminating agent such as diethanolamine and trimethylamine are used. According to the above step (2), an ion exchange membrane is obtained. The ion exchange membrane may be either a cation exchange membrane or an anion exchange membrane.

  In the step (1), a monomer having an ion exchange group may be graft-polymerized to the base sheet 10 instead of a monomer having a group that can be converted into an ion exchange group. In this case, an ion exchange membrane is obtained by the step (1). Examples of the monomer having an ion exchange group include acrylic acid, methacrylic acrylic acid, methacrylic acid, sodium styrenesulfonate, sodium methallylsulfonate, sodium allylsulfonate, vinylbenzyltrimethylammonium chloride, 2-hydroxyethylmethacrylate, dimethylacrylamide And the like.

  As mentioned above, although the embodiment etc. of the processing method of a porous body sheet were explained, the present invention is not limited to the above-mentioned embodiment etc., and various modifications, within the scope of the present invention described in the claims, Improvements are possible.

  The configuration of the processing device 30 is not limited to the configurations shown in FIGS. For example, in the above embodiment, both the first porous sheet 11 and the second porous sheet 12 are used, but only one of them may be used.

  FIG. 11 is a diagram illustrating a state of the processing apparatus when the winding of the porous sheet around the first core according to the modification is completed. FIG. 12 is a diagram showing a state of the processing apparatus when the winding of the porous sheet of FIG. 11 around the second core is completed. The processing apparatus 30A shown in FIGS. 11 and 12 processes a porous sheet 11A as a base sheet. Hereinafter, differences from the processing apparatus 30 illustrated in FIGS. 2 to 10 will be mainly described.

  The first core 21A is detachable from the processing device 30A, and the porous sheet 11A and the dense sheet 13A connected to the porous sheet 11A have been wound in this order before being attached to the processing device 30A. After the first core 21A is attached to the processing device 30A, the leading end of the dense sheet 13A is connected to the second core 22A.

  The porous sheet 11A and the dense sheet 13A of the present modification are carried into the processing device 30A in a state of being wound on the first core 21A, but are being wound in the state of being wound on the second core 22A. It may be carried into processing unit 30A.

  Unlike the base sheet 10 shown in FIGS. 2 to 10, the porous body sheet 11A can hold the treatment liquid 41A. Therefore, unlike the base sheet 10 shown in FIGS. 2 to 10, the porous sheet 11 </ b> A can be processed without being wound on another porous sheet.

  The first core 21A is a suction core having a suction hole on the outer periphery. A porous sheet 11A is wound around the outer periphery of the first core 21A, and a dense sheet 13A is wound around the outer periphery of the porous sheet 11A. The dense sheet 13A extends at least once around the outer periphery of the porous sheet 11A.

  A suction source such as a pump is connected to the first core 21A. This suction source sucks the fluid remaining inside the porous sheet 11A through the suction hole of the first core 21A. At this time, since the dense sheet 13A covers the outer periphery of the porous sheet 11A, the fluid remaining inside the porous sheet 11A can be efficiently sucked.

  The processing device 30A transports the porous sheet 11A at least one way between the first core 21A and the second core 22A. Since this processing method uses the roll-to-roll technique, the porous body sheet 11A can be processed continuously and in large quantities. The porous sheet 11A undergoes a slight dimensional change by being modified.

  Therefore, in order to suppress a problem (for example, wrinkling or tightening) due to a dimensional change of the porous sheet 11A, the processing device 30A moves the porous sheet 11A at least once between the first core 21A and the second core 22A. You may reciprocate.

  During this time, the processing apparatus 30A may replenish the processing liquid 41A to the porous sheet 11A. By replenishing the treatment liquid 41A, the treatment of the porous sheet 11A can be promoted. The supply place and the supply method of the processing liquid 41A are not particularly limited.

  The processing device 30A may apply tension to the porous sheet 11A in the width direction by holding the porous sheet 11A on the expander roll 33A between the first core 21A and the second core 22A. Wrinkles and shrinkage of the porous sheet 11A can be reduced.

  The controller controls the rotation torque of one of the first core 21A and the second core 22A to control the tension acting on the porous sheet 11A in the longitudinal direction, and the other of the first core 21A and the second core 22A. The rotation speed may be controlled.

Reference Signs List 10 base sheet 11 first porous sheet 12 second porous sheet 21 first core 22 second core 23 third core 24 fourth core 30 processing device 33 expander roll 41 first processing liquid 42 second processing liquid

Claims (13)

Suction core having a suction hole on the outer periphery, between the suction core and another core, to transport a porous sheet and a dense body sheet connected to the porous sheet,
Winding the porous sheet around the outer periphery of the suction core, winding the dense sheet around the outer periphery of the porous sheet,
Fluid remaining inside the porous sheet covered with the dense sheet is sucked into the suction hole,
The fluid is at least one of a processing liquid and air;
The treatment liquid is at least one of a modification treatment liquid that modifies a base sheet that is wound around the another core together with the porous sheet and a cleaning treatment liquid that cleans the inside of the porous sheet. One is a method for treating a porous sheet. The porous sheet and the base sheet are stacked and wound on the another core, and the base sheet is treated with the modification treatment liquid held by the porous sheet,
Thereafter, the porous sheet is unwound from the another core, wound around the suction core, and covered with the dense sheet,
The method for treating a porous sheet according to claim 1 , wherein the reforming treatment liquid remaining inside the porous sheet covered with the dense sheet is sucked into the suction holes. The method for treating a porous sheet according to claim 2, wherein the modifying treatment liquid is used for graft-polymerizing a monomer onto the base sheet. The method for treating a porous sheet according to claim 2, wherein the reforming treatment liquid introduces an ion exchange group into the base sheet. Suction core having a suction hole on the outer periphery, between the suction core and another core, to convey a porous sheet and a dense sheet connected to the porous sheet,
Winding the porous sheet around the outer periphery of the suction core, winding the dense sheet around the outer periphery of the porous sheet,
Fluid remaining inside the porous sheet covered with the dense sheet is sucked into the suction hole,
The fluid is at least one of a processing liquid and air;
The method for treating a porous sheet, wherein the treatment liquid is at least one of a modification treatment liquid for modifying the porous sheet and a cleaning treatment liquid for cleaning the inside of the porous sheet. Treating the porous sheet with the reforming treatment liquid,
Thereafter, the porous sheet is unwound from the another core, wound around the suction core, and covered with the dense sheet,
The method for treating a porous sheet according to claim 5 , wherein the reforming treatment liquid remaining inside the porous sheet covered with the dense sheet is sucked into the suction holes. The method for treating a porous sheet according to claim 6 , wherein the modifying treatment liquid is for causing a monomer to graft-polymerize the porous sheet. The method for treating a porous sheet according to claim 6 , wherein the reforming treatment liquid introduces an ion exchange group into the porous sheet. Said air, by sucking on the suction holes, the inert gas and replacement remaining inside the porous body sheet in which the covered with dense sheet,
The method for treating a porous sheet according to any one of claims 1 to 8 , wherein the reforming treatment liquid is then supplied to the porous sheet. The reforming treatment liquid remaining inside the porous sheet covered with the dense sheet is sucked into the suction hole,
Thereafter, the wash treatment solution, said porous body for supplying a sheet, porous sheet processing method according to any one of claims 1-9. The cleaning liquid remaining in the interior of the porous sheet in which the covered with dense sheet, by sucking on the suction holes, replace the gas for drying, according to any one of claims 1 to 10 The method for treating a porous sheet. Claims 1 to use a processing method according to any one of 11, the production method of modifying sheet. The method for producing a modified sheet according to claim 12 , wherein the modified sheet is an ion exchange membrane.

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