JP4838543B2 - Double-side coated substrate transport device - Google Patents

Description

  The present invention relates to a double-side coating apparatus drying facility for a double-sided coating base material represented by an electrode of a secondary battery, a fuel cell or the like.

  For coated substrates such as secondary batteries and fuel cell electrodes, it is necessary to coat the active material on both the front and back surfaces. Conventionally, the surface is coated, dried, and then coated on the back side. The sequential double-sided coating method that dries was the mainstream. In this method, it is necessary to go through the coating and drying process twice to form the front and back coating surfaces, and there is a limit to improvement in productivity. Therefore, an attempt has been made for a double-sided simultaneous coating method in which both front and back surfaces are coated almost simultaneously during coating, and wound through a drying process. At this time, naturally, both sides are wet before entering the drying step, so they cannot be supported and conveyed by a roll or the like, and must be based on a floating method.

  At this time, the end of the base material that is continuously fed is supported by a roll or a die at the coating point, but the downstream portion is sprayed in the drying furnace as described in the following “Patent Document”. It was supported only by the airflow from the nozzle and was unstable.

  In a manufacturing device that manufactures coated substrates, both sides of the substrate are coated simultaneously, dried, and continuously coated on both sides of the substrate, then transported to the dryer. Both sides of the base material are still wet, and the base material cannot be held in a stable manner such as a roll, the base material flutters, and fluctuations due to this flicker are transmitted to the coating point, resulting in uneven coating. Invite.

  In particular, in coating on battery parts such as secondary batteries and fuel cells, the base material is heavy with a metal such as copper foil or aluminum foil, and the coating liquid is applied on both sides, so the coating equipment unit length There is a problem that the mass per unit is large and the vibrator easily vibrates.

JP 2001-329079 [0015]. JP2003-24858 [0014-0015] [0028]

  In battery-related coatings, it is applied in multiple strips in the substrate feed direction on a substrate such as copper foil or aluminum foil, so-called stripe coating or intermittent coating applied intermittently in the direction perpendicular to the substrate feed direction Usually, both or either of the above is performed.

  In this case, the coating liquid is not applied to the entire surface of the base material, and both ends of the base material are uncoated portions. It is effective to suppress the fluttering by gripping the non-coated portion in the vicinity immediately after coating and tensioning the base material.

  Therefore, the present invention is characterized in that control is performed so that the both ends of the substrate to be continuously fed are always gripped and the tension state is maintained immediately after coating.

  As described in claim 1, in order to suppress the fluttering of the base material immediately after the front and back surface coating is completed, the uncoated portions at both ends of the base material are nipped from the front and back surfaces by a pair of rotating bodies. At this time, the base material is pulled by the tension from the downstream, and receives the tension from the rotating body base material by the nip action and rotates.

  In addition, the pair of rotating bodies provided on both the left and right sides are configured to change the direction in the substrate feeding direction. In an actual installation state, as the two sets of nip rotating bodies advance downstream, It is set to "". Accordingly, the rotating body receives a rotational force due to the substrate tension, and conversely, the substrate receives a component force in the substrate feeding direction and the substrate width direction.

  As a result, a tension state in the width direction is added to the base material, the base material is prevented from fluttering near the coating point, and defects such as coating unevenness can be prevented. Furthermore, if this gripping mechanism is operated for a long time, it is not possible to follow the meandering of the base material, and the gripping point may be separated from the base material. Accordingly, the direction of the rotating body is variably controlled with respect to the base material feed direction, thereby correcting the trajectory of the base material feed direction so as not to leave the gripping point.

In addition, a plurality of the pair of rolls are continuously arranged on both sides of the base material, linked by a chain or the like, and sequentially guided to circulate.

Further, by driving these circulation lines, the nip point by each roll moves. It this moving speed of the nip point can also be controlled synchronously to the substrate travel speed, it is also the way used to use stationary.

Furthermore, if the substrate is moved at a speed faster than the substrate speed, the substrate is applied with a tension in the downstream direction by the relative speed difference. Further, the roller successive rows At the same time, by setting a slightly "shaped Ha" type, can also control the force.

In the first aspect of the present invention, it is easy to control the force to maintain the substrate tension state. However, the nip rolls (rotating bodies) in the pair generate some resistance in the rotational direction due to the nip force. Sudden tension fluctuations in the material or transient tension fluctuations in the line control may cause unscheduled rotation, and naturally the fluctuations in the tension state of the base material are also caused by the influence.

Furthermore, as described in claim 2 , by using a gripping member that is a fixed nip member instead of the rotating body , the base material can be continuously gripped in a state where the base material is sufficiently nipped. Within the range of the breaking stress, it is possible to give a stable tension state to the base material around the coated part without being affected by the tension fluctuation around the nip point.

  Double-side coating by controlling to always hold both ends of the substrate to be sent continuously and maintain the tensioned state immediately after coating in the coating process to the coated substrate. It is possible to prevent the base material from fluttering immediately after the double-sided coating of the base material, and to reduce the influence of the obstruction factor when forming the coated surface.

  In order to show the outline of the present invention, the double-side coating mechanism 1 of the present invention will be described with reference to FIG. 1, and the installation position of the gripping means 20 which is the subject of the present invention will be described. FIG. 1 is a side view showing the mechanism of the main part of the double-side coating mechanism. That is, a double-sided coating is applied to a base material used in a secondary battery, a fuel cell, etc., and the downstream position immediately after the coating is completed through the coating device 2, that is, after the coating is completed, before being drawn into the dryer. No contact between the upper and lower surfaces between the double-sided coating device and the dryer, and the tensile force to wind up after completion of drying after passing through the upper and lower spray nozzles of the dryer at high speed. In the portion transported by (1), since the position fixing mechanism with a roller or the like cannot be used for the base material itself, particularly at the position immediately after the double-side coating, so-called base material fluttering occurs.

  In the present invention, the gripping means 20 of the present invention is provided between the double-sided coating mechanism 1 and the dryer 3 in order to prevent the above-described fluttering phenomenon and prevent uneven coating of the base material coated on both sides through the double-sided coating mechanism. Is provided. Since the substrate cannot be held with a roll or the like because of double-side coating, the gripping unit 20 that grips the gripping unit 20 while niping both ends of the substrate will be described below as an example.

In the specification column relating to the best mode for carrying out the invention, the recommended installation position of the gripping means 20 is shown using FIG. 1, but the gripping means 20 of the most basic configuration in the present invention will be described with reference to FIG. explain.

  2 is a front view and a side view of the basic configuration of the gripping means 20 installed at the installation position of the gripping means 20 shown in FIG. The gripping means 20 is provided between the drying side after passing through the front surface die head 5 and the back surface die head 6 of the coating head that transports the substrate 7 that has already been coated on both sides, and the mechanism is A nip roll 101 attached to a frame that supports both ends in the width direction of the base material and holding a bearing 103 on a shaft via a nip spring 121 is nipped at both ends of the base material 7 by upper and lower nip rolls 101 at both ends. It was possible to obtain a stable double-side coating process function by regulating the fluttering of the base material 7 after the completion of the process of the back-side die head 6 that performs the back-side coating when passing through the manufacturing process of the coating mechanism 1.

  Further, the nip roll 101 of the gripping means 20 in this embodiment does not have a drive mechanism, and the base material is aligned with the pulling speed in the downstream part of the transport of the base material 7 according to the operating conditions of the double-side coating mechanism. 7 is a mechanism for applying a pulling force in the width direction.

  The width of the base material 7 along the pulling speed at the downstream part of the transport of the base material 7 according to the operating conditions of the double-side coating mechanism without providing the nip roll 101 with a drive mechanism as in the first embodiment. A mechanism that applies a pulling force in the direction, and provides a stable double-sided coating process function that regulates the fluttering of the base material 7 after completion of the process of the backside die head 6 that performs the backside coating when passing through the manufacturing process of the double-sided coating mechanism 1 As a result, studies were made to completely control the fluttering and obtain a more stable double-side coating process function.

A mechanism for pulling forces in the width direction by the nip roll 101 is obtained as shown in FIG. 3 is found. By setting the direction of the nip roll 101 made of a rotating body at both ends of the base material 7 to “C” as the feed proceeds with respect to the feed direction of the base material 7, As the feed progresses, the nip roll 101 is given a predetermined spread angle with respect to the feed direction so that the tensile force in the width direction of the base material 7 is increased. It was possible to obtain a more stable double-side coating process function by regulating the fluttering of the base material 7 after completion of the process of the back-side die head 6 for performing the back-side coating.

  The above-mentioned Example 1 and Example 2 are further improved, and the double-sided coating which regulates the fluttering of the base material 7 after completion of the process of the backside die head 6 which performs the backside coating when passing through the manufacturing process of the double-sided coating mechanism 1 is stabilized. In order to obtain a process function, studies have been made to completely control the fluttering and obtain a stable double-side coating process function.

  As shown in FIG. 4, a plurality of nip rolls in the width direction with respect to the feed direction of the base material 7 of the nip roll 101 in FIGS. 2 and 3 are formed on both sides of the substrate 7 using a sprocket 124 and a chain 123. A plurality of nip rolls 101 were provided. As shown in (a) and (b) of FIG. 4, (a) shows the case where a plurality of nip rolls 101 at both ends of the equipment 7 are positioned parallel to the width direction, and (b) applies to FIG. 3. In accordance with the idea, the arrangement of the plurality of nip rolls 101 is arranged so that the direction of the nip rolls 101 made of rotating bodies at the both ends of the base material 7 moves in the width direction as the feed proceeds with respect to the feed direction of the base material 7. The nip roll 101 is given a predetermined spread angle with respect to the feed direction so that the tensile force in the width direction of the substrate 7 increases as the feed of the substrate 7 further proceeds.

  When the nip mechanism 101 shown in FIG. 4 is turned on and off along the feed of the base material 7 using the sprocket 124 and the chain 123 at both ends of the base material 7 as shown in FIG. The nip spring 121 is set so that the nip spring 121 acts on the surface where the nip force is exerted by the nip roll 101, and the guide rail 125 is positioned and is effective so that the cam roll 126 acts and the nip roll 101 is released at the effective portion. . Accordingly, since the plurality of nip rolls 101 are a combination of the sprocket 124 and the chain 123, the holding means 20 obtains a stable double-side coating process function, so that the holding mechanism acts at a long distance with respect to the feed direction of the base material 7. In order to obtain a stable double-side coating process function, the flutter is completely controlled, and the mechanism works optimally.

  Further, the above-described Example 3 is further improved, and the double-sided coating process which regulates the fluttering of the base material 7 after completion of the process of the backside die head 6 which performs the backside coating when passing through the manufacturing process of the double-sided coating mechanism 1. In order to obtain the function, studies have been made to completely regulate the fluttering and obtain a stable double-side coating process function.

In the invention described in claim 1, is easy to control the force to keep the base tension, nip rolls of each pair is caused to some extent in the rotational direction resisted by the nip force, the sudden tension of the substrate Unexpected rotation may occur due to fluctuations or transient tension fluctuations in line control, and naturally the fluctuations in the tension state of the base material are also caused by the influence.

Accordingly, as shown in FIG. 5, by using the fixed nip member 130 , the base material can be continuously gripped with the base material sufficiently nipped, and within the range of the base material breaking stress, around the nip point. It is possible to give a stable tension state to the base material around the coated part without being affected by the fluctuation in tension.

  In the double-side coating process in which the double-side coating is performed on the base material, it is possible to stably carry out the coating surface formation when forming the coating surface of the double-side coating base material.

The figure which shows the outline which provided the holding means between the coating part of the double-side coating apparatus, and the drying part. The figure which shows the holding means which has arrange | positioned a pair of nip roll in this invention. The figure which shows the holding means which has arrange | positioned a pair of nip roll set to the downstream "C" in this invention. (A) The figure which shows the holding means which has arrange | positioned several nip roll continuously downstream in this invention in this invention. (B) A view showing a gripping means in which a plurality of a pair of nip rolls set in a “C” shape downstream is continuously arranged in the present invention. FIG. 5 is a modified view of section AA in FIG. 4 showing gripping means made of a fixed nip member in the gripping means shown in FIG. 4.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Double-sided coating mechanism 2 Double-sided coating apparatus 3 Dryer 4 Backup roll 5 Surface die head 6 Back surface die head 7 Base material 8 Surface coating film 9 Back surface coating film 10 Lower injection nozzle 11 Upper injection nozzle 20 Holding means 101 Nip roll 103 Bearing 121 Nip spring 122 Linear actuator 123 Chain 124 Sprocket 125 Guide rail 126 Cam rail 130 Fixed nip member

Claims (2)

After coating the coating liquid continuously on both sides of the substrate, the solvent is dried with a dryer, and in the coating device that forms the coating surface, both ends of the substrate are continuously connected downstream of the coating head. Each of the gripping means composed of a gripping mechanism with a pair of rotating bodies that are gripped from the front and back surfaces, and variably controlling the direction of the pair of rotating bodies at both ends with respect to the substrate feed direction,
A transport device for a double-sided coated base material, wherein a plurality of pairs of rotating bodies that are gripped from the front and back surfaces of the base material are arranged continuously, linked to each other, and driven to circulate . After coating the coating liquid continuously on both sides of the substrate, the solvent is dried with a dryer, and in the coating device that forms the coating surface, both ends of the substrate are continuously connected downstream of the coating head. Each of the gripping means composed of a gripping mechanism with a pair of rotating bodies that are gripped from the front and back surfaces, and variably controlling the direction of the pair of rotating bodies at both ends with respect to the substrate feed direction,
A coating substrate transport apparatus in which a plurality of a pair of rotating bodies to be gripped from the front and back surfaces of a base material are arranged continuously, linked to each other, and driven to circulate. A conveying device for a double-sided coated substrate , wherein a holding member which is a fixed nip member is used .

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