Liquid draining device and web conveying device equipped therewith
The liquid deliquing device with a backup roll and grooved deliquing roll, combined with suction, addresses the challenge of complete liquid removal from webs without scattering, achieving efficient and safe liquid recovery.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- WAKASUI GIKEN CO LTD
- Filing Date
- 2024-12-24
- Publication Date
- 2026-07-06
Smart Images
Figure 2026111623000001_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a draining device for draining a treatment liquid adhering to a web and a web conveying device including the same.
Background Art
[0002] As a device for pulling up and conveying a belt-shaped web from a treatment liquid, Patent Document 1 discloses a web conveying device including a guide roll for guiding a belt-shaped web below the liquid surface of the treatment liquid stored in a treatment tank, a pulling roll for pulling up the web guided by the guide roll from the treatment liquid, and a draining roll for draining the treatment liquid adhering to the web pulled up by the pulling roll. The draining roll has a plurality of drain grooves formed on its outer peripheral surface, and by rotating in the direction opposite to the moving direction of the web, the treatment liquid intervening between the web and the drain grooves is accommodated in the drain grooves and drained.
[0003] The web conveying device disclosed in Patent Document 1 can remove most of the treatment liquid adhering to the web by the draining roll, but there is still room for further improvement when aiming for complete removal of the treatment liquid.
[0004] As a method for removing the treatment liquid adhering to the web, blowing off liquid droplets with an air knife has also been conventionally studied (for example, Patent Document 2), but there is a risk that the blown-off treatment liquid scatters around and causes environmental degradation.
Prior Art Documents
Patent Documents
[0005]
Patent Document 1
Patent Document 2
Summary of the Invention
[0007] The object of the present invention is achieved by a liquid deliquing device comprising a backup roll into which a web engages, and a device body positioned opposite the backup roll with the web in between, wherein the device body deliquing a processing liquid adhering to the web is deliquing the processing liquid, the device body comprising a casing, a liquid deliquing roll rotatably supported within the casing about a rotation axis, and a drive source for rotationally driving the liquid deliquing roll, wherein the outer circumferential surface of the liquid deliquing roll is provided with a plurality of roll grooves consisting of fine grooves formed along the rotation axis at intervals in the circumferential direction, the casing comprising a housing portion for housing the liquid deliquing roll, an opening that opens the housing portion toward the web, and a communication portion that communicates the inside of the housing portion with the outside on the upstream side of the rotation direction of the liquid deliquing roll relative to the opening, and further comprising a suction portion that sucks the inside of the housing portion on the downstream side of the rotation direction of the liquid deliquing roll relative to the opening.
[0008] In this liquid dewatering device, it is preferable that the housing section has a constricted portion formed upstream of the opening in the rotational direction of the liquid dewatering roll, where the gap between the surface of the liquid dewatering roll and the wall surface of the housing section gradually decreases toward the opening.
[0009] Preferably, a plurality of opposing grooves are formed on the wall surface of the constricted portion, facing the roll groove.
[0010] The aforementioned roll groove has a cross-sectional area of 0.03 to 0.3 mm 2 It is preferable that this be the case.
[0011] Furthermore, the above-mentioned object of the present invention is a web conveying device equipped with the above-mentioned liquid de-draining device, comprising a guide roll for guiding a strip-shaped web below the liquid surface of the processing liquid stored in a processing tank, and a lifting roll for lifting the web guided by the guide roll out of the processing liquid, wherein the liquid de-draining device is achieved by a web conveying device that de-drains the liquid from the web lifted by the lifting roll.
[0012] In this web conveying device, it is preferable that the backup roll of the liquid-sealing device has a plurality of drainage grooves formed on its outer surface to contain and drain the processing liquid interposed between it and the web.
[0013] By arranging multiple liquid draining devices vertically, the main body of one liquid draining device can drain liquid from one side of the web, while the main body of another liquid draining device can drain liquid from the other side of the web. [Effects of the Invention]
[0014] According to the present invention, it is possible to provide a liquid removal device that can reliably remove processing liquid adhering to a web without scattering it into the surroundings, and a web conveying device equipped with the same. [Brief explanation of the drawing]
[0015] [Figure 1] This is a schematic diagram of a web transport device according to one embodiment of the present invention. [Figure 2] This is a cross-sectional view of the liquid draining device included in the web conveying device shown in Figure 1. [Figure 3] Figure 2 is a side view of the liquid draining device. [Figure 4] Figure 2 is a plan view of the liquid-sealing rolls included in the liquid-sealing device shown in Figure 2. [Figure 5] Figure 2 is a plan view of the backup roll provided in the liquid draining device shown. [Figure 6] Figure 5 is a plan view showing a modified example of the backup roll. [Figure 7] Figure 2 is a cross-sectional view showing a modified example of the liquid draining device. [Figure 8] It is an enlarged view of the main part of FIG. 7. [Figure 9] It is a plan view showing a modified example of the liquid cutoff roll shown in FIG. 4.
Embodiments for Carrying Out the Invention
[0016] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a schematic configuration diagram of a web conveyance device according to an embodiment of the present invention. The web conveyance device 1 shown in FIG. 1 is incorporated in an etching device, and a web 50 made of a strip-shaped glass film, metal film, resin film, etc. can be sequentially conveyed to two processing tanks 60 by a roll-to-roll method for etching treatment. The number of processing tanks 60 is not particularly limited, and it may be single or three or more.
[0017] The web conveyance device 1 includes a guide roll 10 that guides the web 50 fed out from the pay-out roll 2 below the liquid surface of the processing liquid 61 composed of the etching liquid stored in the processing tank 60, a pull-up roll 20 that pulls up the web 50 guided by the guide roll 10 and immersed in the processing liquid 61 from the etching liquid 61, and a liquid cutoff device 100 that performs liquid cutoff of the processing liquid adhering to the web 50 pulled up by the pull-up roll 20. The web 50 subjected to the etching treatment is wound around the take-up roll 4. The thickness of the web 50 is not particularly limited, but for example, it is 5 to 100 μm.
[0018] The deliquid removal device 100 is positioned above the liquid surface L of the processing liquid 61 and upstream of the lifting roll 20 in the transport direction. It comprises a backup roll 101 with which the web 50 engages, and a device body 102 positioned opposite the backup roll 101 with the web 50 in between. Multiple deliquid removal devices 100 are arranged vertically for each processing tank 60 between the liquid surface L of the processing liquid 61 and the lifting roll 20. The device body 102 of one deliquid removal device 100 deliquidates one side of the web 50, and the device body 102 of the other deliquid removal device 100 deliquidates the other side of the web 50. The deliquid removal device 100 may be single, and may be arranged so that deliquid removal by the device body 102 is performed only on one side of the web 50 (for example, the side in contact with the lifting roll 20).
[0019] Figure 2 is a cross-sectional view of the dehydration device 100, and Figure 3 is a side view of the dehydration device 100 shown in Figure 2, viewed in the direction of arrow A. As shown in Figures 2 and 3, the device body 102 comprises a casing 110, a dehydration roll 130 housed within the casing 110, and a drive source 132 that rotates the dehydration roll 130, removing the processing liquid adhering to the web 50. The drive source 132 comprises, for example, a motor powered by electricity or compressed air and a reduction gear mechanism.
[0020] The de-liquid roll 130 is rotatably supported around a rotating shaft 131 that extends horizontally within the casing 110. As shown in the plan view in Figure 4, numerous (e.g., 100 to 1000) roll grooves 130a, each consisting of a minute cross-section extending parallel to the axis of the rotating shaft 131, are formed on the surface of the de-liquid roll 130 at equal intervals in the circumferential direction. In this embodiment, the cross-sectional shape of the roll grooves 130a is triangular, but other shapes such as rectangular or semicircular may also be used. The length of each roll groove 130a in the longitudinal direction (rotating shaft direction) is preferably at least greater than the width of the web 50, and in this embodiment, each roll groove 130a is formed over the entire longitudinal direction of the de-liquid roll 130, which is longer than the width of the web 50. The minimum gap formed between the surface of the de-liquid roll 130 and the surface of the web 50 is preferably 0.01 to 0.5 mm, and more preferably 0.05 to 0.1 mm.
[0021] The casing 110 consists of a rectangular parallelepiped housing, with the side of the main body 111 facing the web 50 covered by flat plates 112 and 113. The casing 110 includes a housing section 110a for housing the liquid-squeezing roll 130, an opening 114 that opens the housing section 110a toward the web 50 that engages with the backup roll 101, a suction section 115 capable of sucking up the processing liquid detached from the surface of the web 50, and a communication section 116 that connects the housing section 110a to the outside of the casing 110. The main body 111 and the plates 112 and 113 are fastened together by bolts or the like (not shown).
[0022] The housing section 110a is a space mainly formed within the main body 111, and the liquid-squeezing roll 130 is housed with a slight gap between it and the wall surface of the housing section 110a. The opening 114 is formed between the lids 112 and 113, which are arranged vertically in Figure 2. The lids 112 and 113 may be integrated by joining their ends along the rotation axis 131 of the liquid-squeezing roll 130.
[0023] The suction section 115 consists of openings formed in the side walls on both sides of the casing 110 along the rotation axis 131. The suction section 115 is connected to the suction port of the vacuum pump 200 via a gas-liquid separator 210, and the downstream side in the rotational direction of the defrosting roll 130 near the opening 114 is sucked by the suction section 115 via the housing section 110a. The gas-liquid separator 210 is equipped with a demister and the like, and separates and recovers the processed liquid contained in the aspirated gas and returns it to the processing tank 60. The opening position of the suction section 115 in the casing 110 is not particularly limited as long as it is a position that allows suction from inside the housing section 110a on the downstream side in the rotational direction of the defrosting roll 130 relative to the opening 114. For example, the suction section 115 may be formed in the central part along the rotation axis 131, or multiple suction sections 115 may be formed at intervals along the rotation axis 131.
[0024] The communication portion 116 is formed as a slit extending vertically between the lid 112 and the blocking portion 119, which will be described later, and communicates the inside of the housing portion 110a with the outside of the casing 110 on the upstream side of the rotation direction of the dewatering roll 130 relative to the opening 114. The length of the communication portion 116 is approximately the same as the axial length of the dewatering roll 130. On the upstream side of the rotation direction of the dewatering roll 130 relative to the communication portion 116, a blocking portion 119 is provided to block the gap between the wall surface of the housing portion 110a and the surface of the dewatering roll 130. The blocking portion 119 is formed to narrow the gap formed between the surface of the dewatering roll 130 and the blocking portion 119 on the upstream and downstream sides of the dewatering roll 130. This gap is preferably large enough to suppress the passage of processing liquid adhering to the dewatering roll 130, for example, 0.1 to 0.8 mm. The communication portion 116 can also be formed inside the lid 112, and may be, for example, multiple through holes formed at intervals along the rotation axis 131.
[0025] Inside the housing section 110a, there is a water guide plate 117 that stands upright below the liquid-squeezing roll 130, and a water receiving section 118 that protrudes horizontally from the wall surface of the housing section 110a downstream of the water guide plate 117 in the rotational direction of the liquid-squeezing roll 130. The water guide plate 117 is formed in a strip shape along the entire longitudinal direction of the liquid-squeezing roll 130, with its upper end close to the liquid-squeezing roll 130, and is supported by the water receiving section 118. The water receiving section 118 receives the processing liquid falling from above and directs it to the vicinity of the suction section 115 through a through hole.
[0026] Droplets of the processing liquid floating in the containment section 110a collide with the water guide plate 117 and fall along the water guide plate 117, and are sucked into the suction section 115 from the space below the water guide plate 117. The processing liquid that adheres to the surface of the liquid removal roll 130 and passes through the water guide plate 117 is returned to the upstream side in the rotational direction of the liquid removal roll 130 by the shut-off section 119, stored in the water receiving section 118, and falls near the suction section 115. In this way, by providing the water guide plate 117 and the water receiving section 118 in the containment section 110a, the accumulation of processing liquid in the containment section 110a is reliably prevented.
[0027] The backup roll 101 is positioned so that its outer surface engages with the rising web 50 at a predetermined gripping angle (e.g., 3 to 30 degrees), and rotates in the same direction as the movement of the web 50, as indicated by the arrow. The backup roll 101 is preferably an elastic roll such as a rubber roll, but may also be a metal roll or the like. When using a rubber roll, it is preferable to use one with a rubber hardness of 70 degrees or less. The backup roll 101 may be driven to rotate such that the direction of rotation around the horizontal axis at the engagement point with the web 50 is opposite to the direction of movement of the web 50, thereby allowing the processing liquid adhering to the web 50 to be scraped off.
[0028] Figure 5 is a plan view of the backup roll 101. As shown in Figure 5, a plurality of drainage grooves 101a are formed on the outer circumferential surface of the backup roll 101. The drainage grooves 101a consist of a plurality of first grooves 101b that extend inclined with respect to axis C from the axial center of the backup roll 101 toward one end, and a plurality of second grooves 101c that extend inclined from the axial center of the backup roll 101 toward the other end. The first grooves 101b and the second grooves 101c are separated from each other while overlapping in the axial direction at the axial center of the backup roll 101.
[0029] The first groove 101b and the second groove 101c are inclined in opposite directions with respect to the axis C such that the central side of the backup roll 101 is downstream in the rotational direction from the end side, and they contain the processing liquid adhering to the web 50 and guide it from the central part to both ends of the backup roll 101 for discharge. The first groove 101b and the second groove 101c are both straight when the surface of the backup roll 101 is unfolded. In this unfolded state, the angle α of the first groove 101b and the second groove 101c with respect to the axis C of the backup roll 101 is preferably 0 degrees or more and less than 90 degrees, and more preferably 45 to 60 degrees, with 0 degrees being the case when the first groove 101b and the second groove 101c coincide with the direction of axis C. Multiple first grooves 101b and second grooves 101c are arranged at equal intervals along the circumferential direction of the backup roll 101.
[0030] The plan view shape of the drain groove 101a of the backup roll 101 is not necessarily limited to that of this embodiment. For example, as shown in Figure 6(a), the ends of the first groove 101b and the second groove 101c constituting the drain groove 101a may be joined at the axial center of the backup roll 101, forming a V-shaped double helical in plan view. Alternatively, as shown in Figure 6(b), the drain groove 101a may be inclined in one direction from one end to the other in the axial direction of the backup roll 101. For the drain groove 101a shown in Figures 6(a) and (b), the angle α with respect to the axis C of the backup roll 101 is preferably 0 degrees or more and less than 90 degrees.
[0031] In the web transport device 1 having the above configuration, the web 50, which has been lifted from the etching solution 61 by the lifting roll 20 shown in Figure 1, is first de-liquidated by the lower de-liquid device 100, and then de-liquidated by the upper de-liquid device 100. As shown in Figure 2, when the de-liquid roll 130 of the device body 102 is rotated in the direction indicated by the arrow, an accompanying airflow is generated in the housing section 110a due to the rotation of the de-liquid roll 130. This accompanying airflow is blown onto the surface of the web 50 through the opening 114. The surface peripheral speed of the de-liquid roll 130 is not necessarily limited, but it is preferably 10 times or more the transport speed of the web 50. For example, if the transport speed of the web 50 is 0.5 m / s, it is preferable to set the surface peripheral speed of the de-liquid roll 130 to 5 m / s. By introducing outside air into the containment section 110a from the communication section 116, the flow velocity of the airflow blown onto the surface of the web 50 from the opening 114 can be increased.
[0032] The accompanying airflow accompanying the rotation of the defrosting roll 130 decreases in pressure at the moment the roll groove 130a is exposed to the opening 114 due to the rotation of the defrosting roll 130. This causes pulsation in the airflow blown onto the surface of the web 50, promoting the detachment of the processing liquid adhering to the surface of the web 50. The processing liquid detached from the web 50 is then held in the roll groove 130a and guided to the containment chamber 110a. The processing liquid detached from the web 50 is then sucked in by the suction section 115 in the containment section 110a, which widens downstream of the opening 114 in the direction of rotation. The cross-sectional area of the roll groove 130a of the defrosting roll 130 is 0.03 to 0.3 mm² to effectively generate a pulsating airflow and retain the detached processing liquid. 2 Preferably, 0.05 to 0.1 mm 2 It is preferable that it be so.
[0033] In this way, the main body of the device 102 removes liquid from one side of the web 50, while the other side of the web 50 is removed by the backup roll 101. That is, the processing liquid interposed in the gap between the backup roll 101 and the web 50 is continuously pushed into the discharge groove 101a by the relative movement of the web 50 with respect to the backup roll 101, and falls through the discharge groove 101a, moving from the axial center of the backup roll 101 towards both ends, and is drained towards the processing tank 60. To prevent the processing liquid discharged from the discharge groove 101a from adhering to the web 50 again, it is preferable to place a water guide plate 103 directly below the backup roll 101 to guide the processing liquid falling from the backup roll 101 to the receiving tray 103a.
[0034] The device body 102 of the upper-positioned dehydration device 100 dehydrates the other side of the web 50 opposite to the side that the lower-positioned dehydration device 100's device body 102 has dehydrated. In this way, the device body 102 can reliably remove the processing liquid adhering to both sides of the web 50. In this embodiment, the side of the web 50 opposite to the side that the device body 102 dehydrates can be dehydrated by the backup roll 101, thus more reliably removing the processing liquid adhering to the web 50. However, the backup roll 101 does not necessarily need to have a discharge groove 101a, and the configuration may be one in which dehydration by the backup roll 101 does not occur.
[0035] Figure 7 is a cross-sectional view showing a modified example of the liquid draining device 100 shown in Figure 2, and Figure 8 is an enlarged view of the main part of Figure 7. In Figures 7 and 8, the same reference numerals are used for components that are the same as those in Figure 2, and the differences from the configuration shown in Figure 2 will be explained below.
[0036] The de-liquidation device 100 shown in Figures 7 and 8 has a stepped portion 121 and a constricted portion 120 formed upstream of the opening 114 in the rotational direction of the de-liquidation roll 130. The stepped portion 121 is formed on the wall surface of the housing portion 110a so as to widen the gap between it and the surface of the de-liquidation roll 130 in a stepped manner in the rotational direction of the de-liquidation roll 130.
[0037] The constricted section 120 is formed in a circular arc shape in cross-section on the wall surface of the housing section 110a, and multiple opposing grooves 120a, which are fine grooves that extend parallel to the axis of rotation of the liquid-squeezing roll 130 and face the roll groove 130a, are formed at intervals in the rotational direction of the liquid-squeezing roll 130. In this embodiment, the cross-sectional shape of the opposing grooves 120a is triangular, but other shapes such as rectangular or semicircular may also be used. The length of the opposing grooves 120a is preferably greater than the width of the web 50.
[0038] The curvature of the arc-shaped cross-section of the constricted portion 120 differs from the curvature of the surface of the liquid-cutting roll 130. Assuming that there are no opposing grooves 120a and roll grooves 130a, the constricted portion 120 is formed such that the gap between the surface of the liquid-cutting roll 130 and the wall surface of the housing portion 110a gradually decreases toward the opening 114.
[0039] The communication portion 116 is formed in a slit shape parallel to the rotation axis of the liquid-sealing roll 130 and extends almost the entire length of the liquid-sealing roll 130, and extends vertically between the main body 111 of the casing 110 and the lid 112 by cutting out one side of the lid 112. The upper end side of the communication portion 116 (the side communicating with the outside of the casing 110) has a slit width that gradually widens from the inside to the outside of the casing 110 in the left-right direction.
[0040] As shown in Figure 8, the gap S0 upstream of the stepped portion 121 in the rotational direction widens at the stepped portion 121 to become gap S1, and then gradually narrows along the rotational direction at the constricted portion 120 to become gap S2 at the edge of the opening 114. Gaps S0, S1, and S2 are the radial spacing of the liquid-sealing roll 130 formed between the surface of the liquid-sealing roll 130 and the wall surface of the housing portion 110a, assuming that there are no roll grooves 130a and opposing grooves 120a. The gap S0 is preferably 0.1 to 3 mm, and more preferably 0.1 to 0.7 mm. The gap S1 is preferably 1 to 2.5 mm, and more preferably 1.5 to 2 mm. The gap S2 is preferably 0.05 to 0.5 mm, and more preferably 0.05 to 0.1 mm. The lower end of the connecting portion 116 opens into the stepped portion 121 with a slit width W1 smaller than the slit width S1 at the stepped portion 121. The slit width W1 of the connecting portion 116 is preferably 0.2 to 1 mm, and more preferably 0.2 to 0.8 mm. The slit width W1 is the minimum width of the slit-shaped cross section of the connecting portion 116 (length in the left-right direction in Figure 8).
[0041] When the defrosting roll 130 is rotated in the direction indicated by the arrow in Figure 7, the accompanying airflow of the defrosting roll 130 passes through the throttling section 120 and is then blown onto the surface of the web 50 through the opening 114. In the throttling section 120, the flow velocity of the accompanying airflow of the defrosting roll 130 gradually increases, which causes a Venturi effect that reduces the pressure in the throttling section 120. This pressure reduction in the throttling section 120 promotes the introduction of outside air from the communication section 116 that opens into the stepped section 121, thereby increasing the flow rate and velocity of the airflow blown in from the opening 114. In the stepped section 121, the gap S1 widens in a stepped manner, while the communication section 116 opens into the stepped section 121 with a slit width W1 smaller than this gap S1. Therefore, the introduction of outside air from the communication section 116 due to the Venturi effect described above can be reliably promoted, thereby easily enhancing the defrosting effect of the web 50.
[0042] The accompanying airflow caused by the rotation of the liquid-sealing roll 130 is compressed as it passes through the throttling section 120. However, as the roll groove 130a is exposed to the opening 114 from the throttling section 120 due to the rotation of the liquid-sealing roll 130, the pressure of the accompanying airflow decreases. This increases the pulsation of the airflow blown onto the surface of the web 50, and, combined with the effect of increasing the airflow velocity mentioned above, promotes the detachment of the processing liquid from the web 50.
[0043] Furthermore, the formation of multiple opposing grooves 120a on the wall surface of the throttling section 120, in synergy with the roll grooves 130a of the liquid-cutting roll 130, allows for more reliable generation of pulsating airflow. The cross-sectional area of the opposing grooves 120a is 0.03 to 0.3 mm, similar to the cross-sectional area of the roll grooves 130a. 2 Preferably, 0.05 to 0.1 mm 2 It is more preferable that this is the case. The cross-sectional area of each opposing groove 120a may be the same size as the others, but it is preferable that it becomes smaller towards the downstream side in the rotational direction of the liquid-cutting roll 130. Note that the constricted portion 120 does not necessarily need to have opposing grooves 120a, and the wall surface of this portion may be a smooth curved surface without irregularities.
[0044] In each of the above embodiments, the roll groove 130a formed on the surface of the defrosting roll 130 is parallel to the rotation axis 131 in this embodiment, but it is sufficient if it is formed along the rotation axis 131, and it is not necessarily required to be parallel to the rotation axis 131. For example, as shown in Figure 9, by forming the roll groove 130a of the defrosting roll 130 in a V-shaped double helical shape in plan view, and rotating the defrosting roll 130 in the direction indicated by the arrow, the processing liquid detached from the surface of the web 50 can be guided and sucked from both sides in the longitudinal direction of the defrosting roll 130 toward the center.
[0045] Although the web transport device 1 in each of the above embodiments is shown as being incorporated into an etching apparatus, it can be used for various purposes such as guiding a strip-shaped web below the liquid surface of a processing solution stored in a processing tank, and then lifting and transporting it. For example, it can be used as a device for transporting a web into a plating solution stored in a plating tank. [Explanation of symbols]
[0046] 1. Web transport device 10 Guide Roll 20 Lifting Roll 50 Web 60 processing tanks 61 Treatment solution 100 liquid draining device 101 Backup Role 101a Drainage ditch 102 Main unit of the device 110 Casing 110a Storage area 114 Opening 115 Suction part 116 Communication section 120 Aperture section 120a Opposing groove 130 liquid draining rolls 130a Roll groove 132 Power source
Claims
1. A liquid removal device comprising a backup roll into which a web engages, and a device body positioned opposite the backup roll with the web in between, wherein the device body removes the processing liquid adhering to the web, The apparatus body comprises a casing, a liquid-sealing roll rotatably supported within the casing around a rotation axis, and a drive source for rotating the liquid-sealing roll. Multiple roll grooves, each consisting of a fine groove formed along the axis of rotation, are provided on the outer circumferential surface of the aforementioned liquid-sealing roll at intervals in the circumferential direction. The casing comprises a housing section for housing the de-liquid roll, an opening that opens the housing section toward the web, and a communication section that connects the inside of the housing section to the outside on the upstream side of the rotational direction of the de-liquid roll relative to the opening. A liquid dewatering device further comprising a suction unit that sucks the inside of the storage unit downstream of the opening in the rotational direction of the liquid dewatering roll.
2. The liquid dewatering device according to claim 1, wherein the housing portion has a constricted portion formed upstream of the opening in the rotational direction of the liquid dewatering roll, where the gap between the surface of the liquid dewatering roll and the wall surface of the housing portion gradually decreases toward the opening.
3. The liquid de-icing device according to claim 2, wherein a plurality of opposing grooves are formed on the wall surface of the constricting portion, facing the roll groove.
4. The aforementioned roll groove has a cross-sectional area of 0.03 to 0.3 mm. ２ The liquid draining device according to claim 1.
5. A web conveying device comprising the liquid draining device described in claim 1, A guide roll that guides a strip-shaped web below the liquid surface of the processing liquid stored in the processing tank, The system includes a lifting roll that lifts the web, guided by the aforementioned guide roll, out of the processing liquid, The liquid removal device is a web conveying device that removes liquid from the web that has been lifted by the lifting roll.
6. The web conveying device according to claim 5, wherein the backup roll of the liquid-sealing device has a plurality of drainage grooves formed on its outer surface for receiving and draining the processing liquid interposed between it and the web.
7. The web conveying device according to claim 5, wherein the liquid draining devices are arranged in multiple locations vertically, and the device body of one liquid draining device drains liquid from one side of the web, and the device body of another liquid draining device drains liquid from the other side of the web.