JP2016019931A - Double side coating apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a double side coating apparatus capable of carrying out material coating with a uniform thickness even when a sheet-like substrate has a small thickness and a large width.SOLUTION: A double side coating apparatus includes: a first surface-side coating nozzle 31n to coat a coating material to a first surface-side of a sheet-like substrate to be continuously transported; a second surface-side coating nozzle 32n to coat the coating material to a second surface-side; and a sheet-like substrate negative pressure holding part 4 to carry out a negative pressure suction from the first surface-side of the sheet-like substrate. The sheet-like substrate negative pressure holding part is disposed from a position opposed to the second surface-side coating nozzle to a downstream side in a transport direction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a double-side coating apparatus that applies a material to both surfaces of a sheet-like substrate such as a metal foil that is continuously conveyed.

  2. Description of the Related Art Conventionally, a device that continuously conveys a sheet-like base material such as metal foil (hereinafter simply referred to as a sheet-like base material) and applies a battery electrode material (so-called active material, carbon material, etc.) to both sides thereof has been used. . And in order to make the thickness of the coating material apply | coated on a sheet-like base material, the technique which prevents the wrinkle and loosening which generate | occur | produce on the sheet-like base material in continuous conveyance is proposed (for example, patent documents) 1-3).

JP 2007-29789 A JP 2008-284528 A International Publication No. 2011/1648

  In the case of a double-side coating apparatus, when the first surface side (that is, the surface side to which the coating material is applied first) is applied, the coating material is applied to the second surface side that is in a relationship of front and back with the first surface. However, the sheet-like substrate can be conveyed along the surface of the backup roll. For this reason, the coating material is applied to the sheet-like base material by using an application nozzle arranged to face the backup roll without causing wrinkles or slack.

  On the other hand, when applying the second surface side (that is, the surface side on which the coating material is applied later), since it is in an undried state immediately after the coating material is applied to the first surface side on the opposite side, Support across the width of the backup roll is impossible. Therefore, using the second surface side application nozzle arranged on the lower surface side of the sheet-like substrate while applying tension in the conveying direction and the width direction of the sheet-like substrate, the material is moved from the lower gravity side to the upper gravity side. Applying while extruding. At this time, the sheet-like base material is caused by the force of the sheet-like base material and the applied coating material to hang down under the gravity and the flow of the coating material discharged from the second surface side coating nozzle. The force that pushes up the upper side of gravity works. And by the balance of these forces, a sheet-like base material is conveyed, hold | maintained in the flat state over the width direction in the state spaced apart from the 2nd surface side application nozzle.

  7A and 7B are schematic views showing the configuration of a conventional double-side coating apparatus, in which FIG. 7A is a plan view and FIG. 7B is a cross-sectional view.

A conventional double-side coating apparatus 1z includes a sheet-like base material transport unit 2, an application unit 3, a non-coating unit double-side grip unit 25, a drying unit 5, and a press unit 6.
The non-coated part double-sided grip part 25z includes a left end side non-coated part double-sided grip part 25zL and a right end side non-coated part double-sided grip part 25zR, and symmetrically (that is, both ends in the width direction of the sheet-like substrate 10). , In pairs). In addition, the left end side non-coated part double-sided grip part 25L and the right end side non-coated part double-sided grip part 25R arranged in a pair are arranged on the second side of the sheet-like base material 10 on the downstream side. The structure is such that the non-coated part 10n at both ends of the sheet base material 10c after double-sided application is gripped, and continuous conveyance is performed while applying tension toward the outside in the width direction of the sheet base material 10c after double-sided application. Yes.

  Specifically, the non-coating part double-sided gripping part 25 is configured to grip from both sides of the sheet base material 10c after the double-sided application by a roller or a nip. In the case of the nip method, the arrangement is such that the gripping position moves outward in the width direction as it moves downstream.

  And in order to hold | grip the sheet-like base material 10c after double-sided application | coating from both surfaces, a predetermined space | interval (L) is provided so that the non-coating part double-sided holding part 25 may not contact the 2nd surface side application nozzle 32n. It is necessary to arrange the non-coated part double-sided grip part 25 (25L, 25R).

  However, as the thickness of the sheet-like substrate 10 is reduced or the width is increased, a predetermined interval (L) is provided between the non-coated part double-sided grip part 25 and the second surface side application nozzle 32n. As a result, the corrugation phenomenon of the sheet-like base material 10c when the second surface side is applied has become apparent. This undulation phenomenon means that the distance in the thickness direction (that is, the z direction) between the second surface side application nozzle 32n and the sheet-like base material 10c after both-side application is not in the width direction of the sheet-like base material 10c. It is said that the coating thickness of the coating material becomes non-uniform across the width direction of the sheet-like substrate 10c, leading to poor coating thickness.

  Therefore, the present invention provides a double-side coating apparatus that can apply a material with a uniform thickness to the second surface side even when the thickness of the sheet-like base material is thinner than the conventional one or wider than the conventional width. For the purpose.

In order to solve the above problems, one aspect of the present invention is as follows.
A first surface side application nozzle that applies the coating material to the first surface side of the sheet-like substrate that is continuously conveyed;
A second surface side application nozzle for applying a coating material on the second surface side of the sheet-like base material that is continuously conveyed;
A sheet-like base material negative pressure holding part that sucks negative pressure from the first surface side of the sheet-like base material at both end portions in the width direction of the continuously conveyed sheet-like base material,
The sheet-like base material negative pressure holding part is disposed on a position facing the second surface side application nozzle or on the downstream side in the transport direction,
It is a double-sided coating device.

  According to this configuration, the sheet-like base material can be supported in the immediate vicinity of the second surface side application nozzle, and even when the thickness of the sheet-like base material is thinner than the conventional or wider than the conventional width, the sheet Occurrence of the corrugation phenomenon of the substrate can be prevented and application failure can be prevented.

  Even when the thickness of the sheet-like substrate is thinner than the conventional thickness or wider than the conventional width, the coating material can be applied with a uniform thickness.

The top view which shows an example of the form which embodies this invention The side view which shows an example of the form which embodies this invention Schematic which shows the principal part of another example of the form which embodies this invention. The figure which looked at the principal part of another example of the form which embodies the present invention from the lower part Schematic which shows the principal part of another example of the form which embodies this invention. The figure which looked at the principal part of another example of the form which embodies the present invention from the lower part. Schematic showing the device configuration of a conventional double-side coating device

DESCRIPTION OF EMBODIMENTS Embodiments for carrying out the present invention will be described with reference to the drawings.
In the following drawings, the three axes of the orthogonal coordinate system are X, Y, and Z, the XY plane is the horizontal plane, and the Z direction is the vertical direction. In particular, in the X direction, the direction of the arrow is expressed as the downstream side in the conveyance direction, and the opposite direction is expressed as the upstream side in the conveyance direction, and the Z direction is expressed as the upward direction of the arrow and the opposite direction as the downward direction. The Y direction is expressed as the width direction.

  FIG. 1 is a plan view showing an example of a form embodying the present invention. FIG. 2 is a side view showing an example of a form embodying the present invention, and corresponds to FIG.

  Here, a battery electrode core material (for example, a foil material such as aluminum, copper, and stainless steel) is illustrated as a type of the sheet-like base material 10, and the coating material applied to the sheet-like base material 10 is an active material. A slurry material in which a substance, carbon, etc. are kneaded and blended will be described as an example.

  In addition, the 1st surface side of a sheet-like base material described below refers to the surface side on which the coating material is applied first, and the second surface side of the sheet-like base material is applied with the coating material first. Further, it is a surface side that is in a relationship of front and back with the first surface side, and the surface side on which the coating material is applied later is indicated. Moreover, one of the width direction edge parts of a sheet-like base material is called the left edge part side, and the width direction edge part on the opposite side is called a right edge part side.

  The double-side coating apparatus 1 applies a coating material to both surfaces of a sheet-like substrate 10 that is continuously conveyed, and includes a sheet-like substrate conveyance unit 2, an application unit 3, and a sheet-like substrate negative pressure holding unit 4. Configured. Furthermore, the double-side coating apparatus 1 includes a drying unit 5 and a press unit 6 as necessary.

  The sheet-like substrate conveyance unit 2 conveys the sheet-like substrate 10 continuously. Specifically, the sheet-like substrate conveyance unit 2 includes a sheet-like substrate unwinding unit 28 and a sheet-like substrate winding unit 29. The sheet-like substrate unwinding section 28 unwinds the sheet-like substrate 10 while rotating the roll around which the sheet-like substrate 10 is wound. The sheet-like base material winding unit 29 winds the sheet-like base material 10 ′, which has been coated and dried (or subsequently pressed), on the roll while rotating the roll. Furthermore, the sheet-like base material transport unit 2 includes transport support rollers 21 and 22 and a non-coating part double-side grip part 25 as necessary.

  About the non-coating part double-sided holding part 25, it is provided with the left end side non-coating part double-sided holding part 25L and the right end side non-coating part double-sided holding part 25R as in the conventional configuration, and both ends in the width direction of the sheet-like substrate 10 Can be illustrated as symmetrically (that is, in pairs). Specifically, the left end side non-coated part double-sided grip part 25L and the right end side non-coated part double-sided grip part 25R are formed of the material non-coated part 10n at both ends in the width direction of the sheet-like substrate 10c after double-sided application. Examples of the sheet base 10 that are gripped by the pair of rotating rollers 26 from the first surface side and the second surface side can be given. The pair of rotating rollers 26 can be configured by both of which are configured as free rollers or one of which is configured by a rotational driving roller connected to a rotating motor. Further, the pair of rotating rollers 26 is arranged so that the rotation direction coincides with the traveling direction of the sheet-like substrate 10c that is continuously conveyed, or the downstream side thereof is the both end sides of the sheet-like substrate 10 after double-sided coating ( In other words, it is arranged to open outward). Moreover, the non-coating part double-sided grip part 25 may be arranged not only in one set but also in a plurality of sets in the conveying direction of the sheet-like substrate 10c after double-sided application.

  Since the sheet-like base material transport unit 2 has such a configuration, the sheet-like base material 10 or the sheet-like base material 10c after application on both sides can be continuously transported in the direction of the arrow v.

  The application unit 3 applies an application material to the first surface side and the second surface side of the sheet-like substrate that is continuously conveyed. Specifically, the application unit 3 includes a first surface side application nozzle 31n and a second surface side application nozzle 32n. Further, the first surface side application nozzle 31n includes a coating liquid discharge section having an opening of a predetermined length in the width direction of the sheet-like substrate 10, and a coating liquid supply section communicating with the coating liquid discharge section. Yes. A first surface side liquid feed pump 31p is connected to the coating liquid supply unit. Therefore, by supplying the coating material from the first surface side liquid feed pump 31p to the coating liquid supply unit, the coating material is discharged from the coating liquid discharge unit of the first surface side coating nozzle 31n. Similarly, the second surface side coating nozzle 32 includes a coating liquid discharge section having an opening having a predetermined length in the width direction of the sheet-like substrate 10 and a coating liquid supply section communicating with the coating liquid discharge section. ing. A second surface side liquid feed pump 32p is connected to the coating liquid supply unit. Therefore, the coating material is discharged from the coating liquid discharge portion of the second surface side coating nozzle 32n by supplying the coating material from the second surface side liquid feed pump 32p to the coating liquid supply portion.

  The first surface side application nozzle 31n applies the application material to the sheet-like substrate 10 first (that is, on the first surface side). Specifically, the first surface side application nozzle 31n is disposed to face the support roller 33 that conveys the sheet-like base material 10 along the outer peripheral surface with a predetermined interval. The coating liquid discharge part of the first surface side application nozzle 31n is disposed at a position facing the outer peripheral surface of the support roller 33 in a section where the sheet-like base material 10 is along the outer peripheral surface of the support roller 33. ing. More specifically, the first surface side application nozzles 31n are arranged in the horizontal direction as shown in FIGS. 1 and 2 and are spaced apart from the surface of the sheet-like substrate 10 in the width direction (so-called “so-called”). In the state where the nozzle gap is maintained, the coating material is ejected from the coating liquid ejection section from the right direction to the left direction on the paper surface, and the coating material is applied to the first surface side of the sheet-like substrate 10. Yes.

  Since the first surface side application nozzle 31n applies the application material to the sheet-like substrate 10 first, the first surface side application nozzle 31n is limited to the arrangement in which the coating liquid discharge part is oriented in the horizontal direction as described above. Instead, the coating material may be discharged downward from the top or upward from the bottom. Therefore, a section in which the sheet-like base material 10 is along the outer peripheral surface of the support roller 33 may be appropriately set according to the direction in which the coating material is applied, and the coating liquid of the first surface side application nozzle 31n is within that section. What is necessary is just to set suitably arrangement | positioning with the 1st surface side application | coating nozzle and the support roller 33 so that a discharge part may be opposingly arranged with the outer peripheral surface of the support roller 33. FIG.

  On the other hand, the second surface side application nozzle 32n is arranged on the first surface side opposite to the surface side (that is, the first surface side) on which the coating material is applied to the sheet-like substrate 10 (that is, the second surface side). In the stage where the coating material applied to the substrate is not dried, the coating material is applied later. Specifically, as shown in FIGS. 1 and 2, the second surface side coating nozzle 32 n is arranged to discharge the coating material from below to above, and the lower surface of the sheet-like substrate 10 is the second surface. Since it is conveyed while covering the surface side application nozzle 32n, the coating material is applied to the second surface side of the sheet-like substrate 10 (substantially below the conveyance path in the figure).

  And the above-mentioned non-coating part double-sided holding part 25 is arrange | positioned in the downstream of the 2nd surface side application | coating nozzle 32n, and the sheet-like base material 10 is the support roller 33 and a non-coating part double-sided holding part. In the state where a constant tension is applied at 25, the sheet is conveyed in the direction of arrow V. Further, the coating material is discharged from the second surface side coating nozzle 32n disposed between the support roller 33 and the non-coated portion double-side gripping portion 25 onto the sheet-like substrate 10 from below gravity to above gravity. Therefore, a force that pushes up the sheet-like base material is applied by the flow of the coating material, and the sheet-like base material 10 is generally flat in the width direction in balance with the force that causes the sheet-like base material 10 to hang down due to gravity. Held in.

  Because of such a configuration, when the sheet-like base material 10 is conveyed while passing between the first surface side application nozzle 31n and the support roller 33 in the application unit 3, the sheet-like base material is first provided. The coating material is applied to the first surface side of the material 10 (in the figure, generally above the conveyance path). Thereafter, the coating material is applied to the second surface side of the sheet-like substrate 10 (substantially below the conveyance path in the figure) by the second surface side application nozzle 32n.

  The sheet-like substrate negative pressure holding unit 4 sucks the material non-coated portions 10n at both ends in the width direction of the sheet-like substrate 10 continuously conveyed from the first surface side of the sheet-like substrate 10 with a negative pressure. It is. Specifically, the sheet-like base material negative pressure holding unit 4 includes a left end side negative pressure holding unit 4L and a right end side negative pressure holding unit 4R.

  The lower surface side of the left end side negative pressure holding portion 4L and the right end side negative pressure holding portion 4R is, for example, a breathable material such as a porous pad having a flat surface, or a suction pad in which pores are appropriately provided in a material having a substantially flat surface. It is comprised including the member which has. Then, these air-permeable members and negative pressure suction means (for example, a vacuum pump, an ejector, etc.) are connected. The lower surface side of the left end side negative pressure holding portion 4L and the right end side negative pressure holding portion 4R (that is, the side on which the porous pad and the suction pad are arranged) is the upper surface side of the sheet-like substrate 10c coated on both sides. However, it is arrange | positioned in the position which contact | connects the material non-coating part 10n of the width direction both ends. And the sheet-like base material 10 is continuously conveyed, sliding on the surface, maintaining these porous pads and suction pads in a negative pressure state. By doing so, the sheet-like base material 10 and the second surface side application are performed because the sheet-like base material 10 is positioned on the surface of the porous pad or the suction pad while exerting a force to push the sheet-like base material 10 from the lower surface side to the upper surface side. The interval with the nozzle 32n can be kept constant.

  Further, the sheet-like substrate 10 is continuously conveyed in the direction of the arrow v while being held in a flat posture by the support roller 33 and the lower surface side of the left end side negative pressure holding portion 4L and the right end side negative pressure holding portion 4R. Is done. Therefore, in the section between the support roller 33 and the left end side negative pressure holding portion 4L and the right end side negative pressure holding portion 4R, the sheet-like base material 10 flutters in the thickness direction (that is, the z direction) or wrinkles It is possible to prevent the slack from occurring. And in the section between the support roller 33 and the left end side negative pressure holding part 4L and the right end side negative pressure holding part 4R, or the position facing the left end side negative pressure holding part 4L and the right end side negative pressure holding part 4R, Since the second surface side coating nozzle 32n is disposed in the vicinity thereof, the sheet-like substrate 10 being transported and the second surface side coating nozzle 32n form a very uniform coating gap in the width direction.・ Can be maintained. Therefore, even when the thickness of the sheet-like base material 10 is thinner than the conventional thickness or wider than the conventional width, the material can be applied with a uniform thickness on the second surface side.

  The left end side negative pressure holding unit 4L and the right end side negative pressure holding unit 4R may be in a form in which the relative position with the second surface side application nozzle 32n is fixed, or the second surface side application nozzle. The form which can move with respect to the nozzle 32n may be sufficient. In the latter case, each of the left end side negative pressure holding portion 4L and the right end side negative pressure holding portion 4R has a conveying direction (that is, the X direction) of the sheet-like base material 10c or a direction orthogonal thereto (that is, the Y direction). Alternatively, a configuration in which the position is appropriately adjusted or positioned and moved (for example, an air cylinder or an electric actuator) in the combined direction (XY direction) is used. By doing so, even when the thickness and width dimensions of the sheet-like substrate to be transported change, or when the thickness of the coated material to be applied and the end position in the width direction change, Accordingly, the position can be appropriately set at a position where gripping and conveyance can be performed with an optimal balance, and wrinkles and slack can be prevented from occurring in the sheet-like substrate during continuous conveyance. In addition, the first end side gripping portion 4L and the second end side gripping portion 4R are not limited to one set in order to disperse the force applied to the sheet-like base material 10, but also the sheet-like base material 10c after double-side coating. A configuration may be adopted in which a plurality of sets are arranged in the transport direction.

  The drying unit 5 dries the coating material applied to both surfaces of the sheet-like substrate 10 that is continuously conveyed. The drying unit 5 includes, for example, a heater unit 51, a blower fan 52, and a cold air nozzle 52 disposed on the first surface side and the second surface side of the sheet-like base material 10c. Therefore, the sheet-like base material 10c to which the coating material is applied passes through the drying unit 5 so that the binder component contained in the coating material is volatilized and the liquid slurry material is solidified (that is, in a dry state). Become).

  The press unit 6 is for compacting the coated and dried coating material. The press unit 6 includes, for example, an upper surface side press roller 61 and a lower surface side press roller 62. The upper surface side press roller 61 and the lower surface side press roller 62 are arranged to face each other at a predetermined interval, and the sheet material after drying passes through this space, so that the coating material is the thickness of the sheet material. Pressed in the direction and consolidated.

  Since the double-side coating apparatus 1 has such a configuration, when the coating material is applied to both surfaces of the sheet-like substrate 10 that is continuously conveyed, the sheet-like substrate is located in the immediate vicinity of the second surface-side coating nozzle 32n. The material 10 can be supported. And even when the thickness of the sheet-like base material 10 is thinner than before or wider than the conventional width, the occurrence of the undulation phenomenon of the sheet-like base material 10 can be prevented and application failure can be prevented. As a result, the coating material can be applied with a uniform thickness even when the thickness of the sheet-like base material 10 is thinner than the conventional thickness or wider than the conventional width.

  In addition, although the structure provided with the drying part 5 and the press part 6 was illustrated as a specific structure of the above-mentioned double-side coating apparatus 1, when implementing this invention, it is not an essential structure. Therefore, the present invention can be applied even to a double-side coating apparatus having a configuration that does not include the drying unit 5 and the press unit 6.

[Another form]
In the double-side coating apparatus according to another example embodying the present invention, the above-described sheet-like substrate negative pressure holding unit 4 may be a sheet-like substrate negative pressure holding unit 4B having the following configuration. . That is, instead of the configuration of the sheet-like substrate negative pressure holding unit 4 (that is, 4L, 4R) described above with reference to FIG. 3, a vacuum roll as described below is used.

  FIG. 3 is a schematic view showing a main part of another example of a form embodying the present invention, in which the sheet-like base material negative pressure holding portion 4B is arranged from the downstream side in the conveying direction of the sheet-like base material 10c to the upstream side. It shows how it was seen. FIG. 4 is a view of a main part of another example of a form embodying the present invention as viewed from below, and corresponds to FIG.

  The sheet-like base material negative pressure holding portion 4B includes a left end side vacuum roll 40L and a right end side vacuum roll 40R. And these vacuum rolls 40L and 40R are provided with outer shells 41L and 41R and inner shells 42L and 42R. Furthermore, the inner shells 42L and 42R are appropriately disposed via the connecting members 43L and 43R.

  The outer shells 41L and 41R are cylindrical and have a large number of holes on the surface, and are configured to be rotatable around the inner shells 42L and 42R in the direction of the arrow Rt.

  The inner shells 42L and 42R are cylindrical hollow casings, and an opening is formed in a part of the casing in contact with the outer shells 41L and 41R (in the case of the present invention, the sheet-like base material 10 side, that is, the lower side). Is provided. The inner shells 42L and 42R are connected to the negative pressure generating means through the communication ports 44L and 44R, and have a structure in which a negative pressure acts on the opening.

  Since the left end side vacuum roll 40L and the right end side vacuum roll 40R which comprise the sheet-like base-material negative pressure holding part 4B have such a structure, the material uncoated part of the both ends 10R of the sheet-like base material 10 The sheet-like base material 10 can be smoothly and continuously conveyed while suctioning 10n at a negative pressure.

  In the sheet-like base material negative pressure holding portion 4B, the rotation direction Rt of the left end side vacuum roll 40L and the right end side vacuum roll 40R is the transport direction of the sheet base material 10 that is continuously transported (that is, the direction of the arrow v). However, it is preferable that the rotation direction Rt is directed to the outer side in the width direction of the sheet-like substrate 10 as shown in the drawing.

  In addition, in order to make the rotation direction Rt of the left end side vacuum roll 40L and the right end side vacuum roll 40R face the outside in the width direction of the sheet-like base material 10, the connecting members 43L and 43R that support them are respectively It is configured to be attached via a rotation mechanism (for example, a rotary actuator) that rotates in the directions of the arrows 45L and 45R.

  According to this configuration, the sheet-like substrate can be supported in the immediate vicinity of the second surface side application nozzle, and further, the tension T is applied in the width direction of the sheet-like substrate in the immediate vicinity of the second surface side application nozzle. Can be granted. Therefore, even when the thickness of the sheet-like base material is thinner than the conventional case or wider than the conventional width, it is possible to prevent the wavy phenomenon of the sheet-like base material from occurring and to prevent poor coating.

[Another form]
A double-sided coating apparatus according to an example of still another embodiment embodying the present invention is a sheet-like substrate negative pressure holding portion 4C as described below, instead of the above-described sheet-like substrate negative pressure holding portions 4 and 4B. It is good also as a structure provided with.

  FIG. 5 is a schematic view showing a main part of still another example of a form embodying the present invention, in which the sheet-like base material negative pressure holding portion 4C is moved from the downstream side in the conveying direction of the sheet-like base material 10c to the upstream side. It shows a state of seeing. FIG. 6 is a view of a main part of still another example of the embodiment embodying the present invention as viewed from below, and corresponds to FIG.

  The sheet-like base material negative pressure holding portion 4C includes a left end side vacuum pad 46L and a right end side vacuum pad 46R. The vacuum pads 46L and 46R are configured to include housings 47L and 47R and suction pads 48L and 48R. Further, the vacuum pads 46L and 46R are arranged with the housings 47L and 47R through the connecting members 43L and 43R as appropriate.

  The casings 47L and 47R are hollow casings, and part of the casing on the side in contact with the suction pads 48L and 48R (in the case of the present invention, the sheet-like base material 10 side, that is, the lower side). The casings 47L and 47R are connected to the negative pressure generating means through the communication ports 44L and 44R, and have a structure in which negative pressure acts on the openings.

  The suction pads 48L and 48R can be configured by using a block material such as metal, resin, or ceramic provided with a large number of pores or using a porous material. Furthermore, the suction pads 48L and 48R have recesses 49L and 49R on the side (that is, the lower surface side) in contact with the sheet-like substrate 10 that is continuously conveyed. The recessed portions 49L and 49R may be arranged in parallel with the conveying direction of the sheet-like substrate 10 that is continuously conveyed (that is, the direction of the arrow v), but are arranged in the direction shown in the figure. It is preferable. That is, the recessed portions 49L and 49R are arranged so as to be positioned on the outer side in the width direction of the sheet-like substrate 10 toward the downstream side of the sheet-like substrate 10 that is continuously conveyed.

  According to this configuration, the sheet-like substrate can be supported in the immediate vicinity of the second surface side application nozzle, and further, the tension T is applied in the width direction of the sheet-like substrate in the immediate vicinity of the second surface side application nozzle. Can be granted. Therefore, even when the thickness of the sheet-like base material is thinner than the conventional case or wider than the conventional width, it is possible to prevent the wavy phenomenon of the sheet-like base material from occurring and to prevent poor coating.

[Another form]
In the above, while showing a specific configuration,
The coating liquid discharge part of the second surface side application nozzle 32n is arranged horizontally across the width direction of the sheet-like base material, and applies the coating material from the gravity lower side toward the gravity upper side. Has been placed,
The sheet-like base material negative pressure holding portions 4, 4 </ b> B, and 4 </ b> C exemplify a configuration in which the sheet-like base material that is continuously conveyed is disposed so as to suck negative pressure from the gravity lower side to the gravity upper side. The form which embodies is demonstrated.

With such a configuration, the coating material immediately after coating does not flow in the width direction (left end side or right end side) of the sheet base material, which is preferable when coating a fluid coating material. However, if the viscosity of the coating material is high, it is not limited to such a form, and the sheet-like substrate that is continuously conveyed is conveyed in the vertical direction (one of the left end and the left end is above or below gravity). The present invention can also be applied to a mode in which the sheet is conveyed or obliquely conveyed.

DESCRIPTION OF SYMBOLS 1 Double-side coating apparatus 2 Sheet-like base material conveyance part 3 Application | coating part 4 Sheet-like base material negative pressure holding part 4L Left end side negative pressure holding part 4R Right end side negative pressure holding part 5 Drying part 6 Press part 10 Sheet-like base material (core Material)
10c Sheet-like base material after double-sided coating 10n Non-coated portion of sheet-like base material after double-sided coating 10 'Sheet-like base material (after drying or after pressing)
DESCRIPTION OF SYMBOLS 21 Conveyance support roller 22 Conveyance support roller 25 Non-coating part double-sided grip part 25L Left end side non-coating part double-sided grip part 25R Right end non-coating part double-sided grip part 28 Sheet-like base material unwinding part 29 Sheet-like base material winding Take part 31n First surface side application nozzle 31p First surface side liquid feed pump 32n Second surface side application nozzle 32p Second surface side liquid supply pump 32q Application material protrusion (second surface side application nozzle)
33 Support roller 40L Left end side vacuum roll 40R Right end side vacuum roll 41L Outer shell (left end side)
41R Outer shell (right end side)
42L inner shell (left end side)
42R Inner shell (right end side)
43L Connecting member (Left end side)
43R connecting member (right end side)
44L communication port (left side)
44R communication port (right end side)
45L arrow (direction of rotation)
45R arrow (direction of rotation)
46L Left end side vacuum pad 46R Right end side vacuum pad 47L Case (Left end side)
47R housing (right end side)
48L suction pad (left end side)
48R Suction pad (Right end side)
49L Groove (Left end side)
49R Groove (right end side)
51 IR heater 52 Hot air fan 53 Cooling nozzle 61 Upper surface side press roller 62 Lower surface side press roller v Arrow (conveying direction)
Rt Rotation direction T Tension

Claims (5)

A first surface side application nozzle that applies the coating material to the first surface side of the sheet-like substrate that is continuously conveyed;
A second surface side application nozzle for applying a coating material on the second surface side of the sheet-like base material that is continuously conveyed;
A sheet-like base material negative pressure holding part that sucks negative pressure from the first surface side of the sheet-like base material at both end portions in the width direction of the continuously conveyed sheet-like base material,
The sheet-like base material negative pressure holding part is disposed on a position facing the second surface side application nozzle or on the downstream side in the transport direction,
Double-side coating device. A first surface side application nozzle that applies the coating material to the first surface side of the sheet-like substrate that is continuously conveyed;
A second surface side application nozzle for applying a coating material on the second surface side of the sheet-like base material that is continuously conveyed;
A sheet-like base material negative pressure holding part that sucks negative pressure from the first surface side of the sheet-like base material at both end portions in the width direction of the continuously conveyed sheet-like base material,
The sheet-like substrate negative pressure holding unit is disposed at a position facing the second surface side application nozzle or downstream in the conveying direction, and applies tension to the sheet-like substrate on the outer side in the width direction of the sheet-like substrate. To
The double-side coating apparatus according to claim 1. The sheet-like base material negative pressure holding part is provided with a rotary negative pressure generating part,
The rotary negative pressure generator is set such that the rotation direction is inclined toward the outer side in the width direction of the sheet-like substrate that is continuously conveyed.
The double-side coating apparatus according to claim 2. The sheet-like base material negative pressure holding part is provided with a fixed negative pressure generating part having a dent part on the side in contact with the continuously conveyed sheet-like base material,
The recessed portion of the fixed negative pressure generating unit is set to be positioned on the outer side in the width direction of the continuously conveyed sheet-like base material, on the downstream side of the continuously conveyed sheet-like base material,
The double-side coating apparatus according to claim 2. The coating liquid discharge portion of the second surface side application nozzle is disposed horizontally across the width direction of the sheet-like base material, and applies the coating material from the gravity lower side toward the gravity upper side. Are located in
The sheet-like base material negative pressure holding unit is arranged so as to suck the negative pressure of the continuously transported sheet-like base material from the lower gravity side to the upper gravity side.
The double-sided coating apparatus in any one of Claims 1-4.