JP2017070984A - Roll press machine and roll press method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inhibit occurrence of wrinkles in a non-coated part of a continuous sheet-like base material, which is located adjacent to a coated part, even at a high rolling rate.SOLUTION: A roll press machine rolls a continuous sheet-like base material 1 having a coated part, in which a coating slip is applied, and includes: a base material transport part which transports the continuous sheet-like base material 1 from an upstream side to a downstream side in a transport direction 6; a front side pressure roll 4 and a rear side pressure roll 5 which roll the coated part 2 in the transported continuous sheet-like base material 1; and heating parts which are located at the upstream side of the front side pressure roll 4 and the rear side pressure roll 5 and heat a non-coated part on the continuous sheet-like base material 1 which is located adjacent to the coated part 2.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a roll press machine and a roll press method for rolling a coating portion such as a coating solution coated on a continuous sheet-like substrate.

Along with the increase in capacity of secondary batteries, a coating liquid with an increased coating weight is applied to a continuous sheet-like substrate and dried, and then rolled to increase the density of the electrodes. . Such rolling is continuously rolled (roll press) with a rolling roll while conveying a continuous sheet-like substrate in the conveying direction.

  At that time, the roll press is different from the flat plate press in that an inertial force acts in the conveying direction by a linear pressure load. In addition, the rolling roller contacts and rolls the coated part coated with a thickness on the continuous sheet-like substrate, but the rolling roller does not contact the non-coated part where the coating liquid is not applied. Do not apply load. That is, a load is applied only to the coated part and no load is applied to the non-coated part. Therefore, wrinkles occur in the continuous sheet-like base material in the non-coating part adjacent to the coating part due to local load force and inertial force, the electrode peels and falls, the winding failure of the continuous sheet-like base material, or the battery Problems such as deterioration of sealing properties at the time of stacking may occur.

  In Patent Document 1, in order to suppress the occurrence of such wrinkles, the conveyance roller downstream from the press roller (rolling roller) is in contact only with the coating portion of the continuous sheet-like base material, Describes a configuration in which no conveying tension is applied.

  Patent Document 1: Japanese Patent Application Laid-Open No. 2014-123491

  However, as described in paragraph 0015, wrinkles are suppressed if the rolling rate is limited as described in paragraph 0015, but if the rolling rate is not limited, a press roller (rolling There is a problem that wrinkles generated when the roller passes through the roller cannot be suppressed.

This invention solves the said problem and makes it a subject to suppress generation | occurrence | production of the wrinkle in the non-coating part adjacent to the coating part of a continuous sheet-like base material even at a high rolling rate.

  In order to solve the above-mentioned problems, the present invention is a roll press machine for rolling a continuous sheet-like base material partially having a coating portion coated with a coating liquid, the continuous sheet-like base material being A base material transport unit that transports from upstream to downstream in the transport direction, a rolling roll that rolls the coating portion of the continuous sheet-shaped base material that is transported, and a continuous adjacent to the coating portion upstream of the rolling roll The present invention provides a roll press machine comprising a heating unit that heats an uncoated portion on a sheet-like substrate.

  With this configuration, the non-coated part of the continuous sheet-like base material is softened by being heated by the heating part, and the non-coated part is also deformed along with the deformation of the continuous sheet-like base material due to rolling of the coated part. Even at a high rolling rate, generation of wrinkles in the non-coated portion adjacent to the coated portion of the continuous sheet-like substrate can be suppressed.

The said rolling roll may be equipped with the front side rolling roll and the back side rolling roll so that the said coating part in both surfaces of the said continuous sheet-like base material may be rolled.

  With this configuration, even if there are coated portions on both sides of the continuous sheet-like substrate, it can be rolled appropriately.

  The heating unit may include a front side heating unit and a back side heating unit so as to heat both surfaces of the continuous sheet-like base material.

  With this configuration, even if there are coated portions on both sides of the continuous sheet-like substrate, it is possible to suppress the occurrence of wrinkles in the non-coated portion adjacent to the coated portion.

You may comprise the said heating part with the hot air nozzle which injects a hot air.

  With this configuration, the continuous sheet-like substrate can be heated with a relatively simple configuration.

  In order to solve the above-mentioned problems, the present invention provides a roll press method for rolling a continuous sheet-like base material partially having a coating part coated with a coating liquid, the continuous sheet-like base Provided is a roll press method characterized by rolling the coated part after heating the non-coated part adjacent to the coated part while conveying the material from upstream to downstream in the conveying direction. .

  With this configuration, the non-coated part of the continuous sheet-like base material is softened by being heated by the heating part, and the non-coated part is also deformed along with the deformation of the continuous sheet-like base material due to rolling of the coated part. Even at a high rolling rate, generation of wrinkles in the non-coated portion adjacent to the coated portion of the continuous sheet-like substrate can be suppressed.

It is a figure which shows the structure of the roll press machine in Example 1 of this invention. It is a perspective view which shows the rolling part of the continuous sheet-like base material in Example 1 of this invention. It is a side view which shows the rolling part of the continuous sheet-like base material in Example 1 of this invention. It is a figure explaining the deformation rate of a continuous sheet-like base material. It is a figure explaining the deformation rate of the continuous sheet-like base material at the time of providing the heating part in Example 1. FIG.

Embodiment 1 of the present invention will be described below with reference to FIGS. FIG. 1 is a diagram showing a configuration of a roll press machine according to Embodiment 1 of the present invention. FIG. 2 is a perspective view showing a rolled portion of the continuous sheet-like substrate in Example 1 of the present invention. FIG. 3 is a side view showing a rolled portion of the continuous sheet-like substrate in Example 1 of the present invention. FIG. 4 is a diagram for explaining the deformation rate of the continuous sheet-like substrate. FIG. 5 is a diagram for explaining the deformation rate of the continuous sheet-like base material when the heating unit in Example 1 is provided.

As shown in FIG. 1, the roll press machine 30 in Example 1 of this invention is the unwinding part 31 of the continuous sheet-like base material 1 located upstream, and the winding part of the continuous sheet-like base material 1 located downstream. 32, the base material conveyance part 34 which conveys the continuous sheet-like base material 1 from the upstream to the downstream in the conveyance direction 6, and the rolling part 33 located in the middle of the unwinding part 31 and the winding part 32 are included.

In Example 1 of this invention, as shown in FIG. 2, the conveyance direction 6 of the continuous sheet-like base material 1 is orthogonal to the Y direction, and the width direction of the continuous sheet-like base material 1 is the X direction and the X direction. A direction perpendicular to the Y direction is taken as a Z direction.

In Example 1, the continuous sheet-like base material 1 is made of aluminum or copper, and the coating parts 2 and 3 in which a coating liquid for forming an electrode is continuously applied and dried in the central part thereof are in the Y direction. (See FIGS. 2 and 3). There are non-coating parts on both outer sides of the coating parts 2 and 3 (both ends of the continuous sheet-like base material), and an area of 5 to 10 mm in the width direction of the non-coating part adjacent to the coating part is applied. It is defined as an adjacent area 7.

The number of the coating parts 2 and 3 formed is not limited to one, but may be two or three, or more coating parts may be formed. The width dimension of the coating parts 2 and 3 per one line is about 50-300 mm, and the width dimension of the continuous sheet-like base material 1 is about 100 mm-2000 mm. When two or more coating parts are provided, there are non-coating parts between the coating parts, and the coating part adjacent area 7 exists.

The continuous sheet-like substrate 1 is drawn from the upstream unwinding unit 31 by the substrate conveying unit 34 and conveyed in the conveying direction 6 at a speed of 1 to 300 m / min, guided to the rolling unit 33, and applied as an electrode. The work parts 2 and 3 are rolled. The film thickness of the coating parts 2 and 3 before rolling is 30 μm to 200 μm, but by rolling, the film is compressed and shaped by about 70 to 90%, which contributes to an increase in battery capacity. The rolled continuous sheet-like base material 1 is transported in the transport direction by the base material transport section 34 and is wound in a roll shape by the downstream winding section 32.

The rolling part 33 will be described in detail with reference to FIGS. In the rolling unit 33, two rolling rolls are provided in the Z direction so as to sandwich the continuous sheet-like substrate 1. That is, a front side rolling roll 4 for rolling the front side coating part 2 of the continuous sheet-like substrate 1 and a back side rolling roll 5 for rolling the back side coating part 3 are separated by a distance 2a + b as shown in FIG. It is provided in parallel with the X direction, and its width (dimension in the X direction) is larger than the width of the continuous sheet-like substrate 1.

Here, the front-side rolling roll 4 is applied to the coating portion 2 on the surface of the continuous sheet-like substrate 1, and the back-side rolling roll 5 is applied with a load (0) for rolling the coating portion 3 on the back surface of the continuous-sheet-like substrate 1 respectively. .3 to 3 t / cm). Both the front-side rolling roll 4 and the back-side rolling roll 5 are in contact with the coating part 2 and the coating part 3 of the continuous sheet-like substrate 1 and apply a linear pressure load, but are not in contact with the non-coating part ( Therefore, no load is applied. Moreover, the continuous sheet-like base material 1 exerts an inertial force in the transport direction 6 by the base material transport unit 34. By these local load force and inertial force, wrinkles are generated in the coating portion adjacent area 7 (width dimension is about 5 to 10 mm) adjacent to the coating portions 2 and 3 among the non-coated portions.

The cause of wrinkles occurring in the coating area adjacent area 7 will be discussed with reference to FIG. 4 is a cross-sectional view of the continuous sheet-like substrate 1 when the continuous sheet-like substrate 1 is rolled by the front-side rolling roll 4 and the back-side rolling roll 5 (the description of the front-side rolling roll 4 and the back-side rolling roll 5 is omitted). And the deformation rate of the continuous sheet-like substrate 1 during rolling along the width direction (X direction). That is, the portion of the continuous sheet-like base material 1 with the coating portions 2 and 3 to be rolled by the front side rolling roll 4 and the back side rolling roll 5 has a high deformation rate due to the application of a load by rolling, but other than the coating portions 2 and 3. The deformation rate of the continuous sheet-like substrate 1 in the non-coated part is zero. That is, by rolling the coating parts 2 and 3 and not rolling the non-coating part, the coating parts 2 and 3 and the non-coating part in the width direction of the continuous sheet-like substrate 1 as shown in FIG. It is considered that wrinkles occur in the coating portion adjacent area 7 because the deformation rate changes abruptly at the boundary portion. In Example 1, in order to suppress generation | occurrence | production of this wrinkle, the heating part is provided in the coating part adjacent area 7 of the upstream of the front side rolling roll 4 and the back side rolling roll 5.

In Example 1, the heating unit includes a front side heating unit that injects hot air onto the surface of the continuous sheet-like substrate 1 and a back side heating unit that injects hot air onto the back surface of the continuous sheet-like substrate 1. That is, as the front side heating unit, a front side hot air nozzle 10 that heats the coating portion adjacent area 7 on the back side in the X direction in FIG. 2 and a front side hot air nozzle 11 that heats the coating portion adjacent area 7 on the front side in the X direction are provided. It has been. Moreover, as a back side heating part, the back side hot air nozzle 12 (not shown in FIG. 2) for heating the coating part adjacent area 7 on the back side in the X direction in FIG. 2 and the coating part adjacent area 7 on the near side in the X direction are shown. The back side hot air nozzle 13 which heats is provided. Further, the hot air is guided from the known hot air generator (not shown) to the front hot air nozzles 10 and 11 and the back hot air nozzles 12 and 13 and ejected.

Here, the effect of the heating unit on the continuous sheet-like substrate 1 will be described with reference to FIG. FIG. 5 shows an embodiment in which a heating unit, that is, front side hot air nozzles 10 and 11 and back side hot air nozzles 12 and 13 not shown in FIG. 5 are provided upstream of the front side rolling roll 4 and the back side rolling roll 5. Sectional drawing of the continuous sheet-like base material 1 when the continuous sheet-like base material 1 in FIG. 1 is rolled by the front side rolling roll 4 and the back side rolling roll 5 (the description of the front side rolling roll 4 and the back side rolling roll 5 is omitted. And the deformation rate of the continuous sheet-like substrate 1 during rolling along the width direction (X direction). As shown in FIG. 5, the continuous sheet-like base material 1 in the portion having the coating parts 2 and 3 to be rolled by the front-side rolling roll 4 and the back-side rolling roll 5 is deformed by application of a load by rolling in the same manner as in FIG. 4. The rate is high. On the other hand, the coating part adjacent area 7 of the continuous sheet-like base material 1 is softened by heating in the heating part, and the continuous sheet-like base material 1 in the coating parts 2 and 3 is deformed by applying a load by rolling. Accordingly, the coating portion adjacent area 7 is also deformed to some extent, so that the deformation rate of the continuous sheet-like substrate 1 in the coating portion adjacent area 7 gradually decreases. That is, the change in the deformation rate when there is a heating unit is slower than the change in the deformation rate when there is no heating unit.

As described above, the coating portion adjacent area 7 of the continuous sheet-like substrate 1 becomes soft due to the heating of the heating portion, and becomes soft with the deformation of the continuous sheet-like substrate 1 in the coating portions 2 and 3 by rolling. The continuous sheet-like substrate 1 in the non-coated part (coated part adjacent area 7) is also deformed, and the deformation rate changes at the boundary between the coated parts 2 and 3 and the non-coated part as shown in FIG. Blunting and generation of wrinkles are suppressed. For example, in the physical property value when the continuous sheet-like substrate 1 is composed of pure aluminum, the elongation at room temperature is about 40%, whereas it is 70 to 80% when the temperature is 200 to 300 ° C. ing.

In addition, in Example 1, although the coating parts 2 and 3 formed in the continuous sheet-like base material 1 were made into 1 each on the surface and back surface of the continuous sheet-like base material 1, it is not necessarily limited to this. For example, two strips may be formed on the front surface and / or the back surface, or more coating portions may be formed. When two or more coated portions are formed, a non-coated portion exists between the coated portions, and a coated portion adjacent area 7 exists. And in the coating part adjacent area 7 between coating parts, in order to suppress generation | occurrence | production of a wrinkle, a heating part is provided in the upstream of the front side rolling roll 4 and a back side rolling roll.

Moreover, in Example 1, although the coating part is formed in the surface and back surface of the continuous sheet-like base material 1, it is not necessarily limited to this. The coating part may be formed only on the front surface or only on the back surface. In that case, it may replace with the rolling roller of the surface in which the coating part is not formed, may provide a flat plate, and you may make it roll only with a rolling roller on one side.

Furthermore, in Example 1, although the front side hot air nozzles 10 and 11 were provided in the surface of the continuous sheet-like base material 1, and the back side hot air nozzles 12 and 13 were provided in the back surface of the continuous sheet-like base material 1, it was not necessarily this. It is not limited to. What is necessary is just to heat to such an extent that generation | occurrence | production of the wrinkle in the coating part adjacent area 7 of the continuous sheet-like base material 1 can be suppressed. For example, if heating is sufficient, only the front hot air nozzles 10 and 11 may be provided, or only the back hot air nozzles 12 and 13 may be provided. Moreover, when a coating part is 2 or more, it is good also as a structure which provides a hot air nozzle also in the non-coating part between coating parts.

Moreover, in Example 1, although the front side hot air nozzles 10 and 11 and the back side hot air nozzles 12 and 13 were provided as a heating part, it is not necessarily limited to this. You may comprise a heating part with another heat source. For example, you may comprise with an induction heating part, a lamp | ramp, etc. Moreover, you may provide another kind of heating part by the front side and back side of the continuous sheet-like base material 1. FIG.

  As described above, in Example 1 of the present invention, it is a roll press machine that rolls a continuous sheet-like substrate partially having a coating part coated with a coating liquid, and the continuous sheet-like substrate A base material transport unit that transports the material from upstream to downstream in the transport direction, a rolling roll that rolls the coating unit in the continuous sheet-shaped base material that is transported, and adjacent to the coating unit upstream of the rolling roll And a heating unit that heats the non-coated part on the continuous sheet-like base material, so that the non-coated part of the continuous sheet-like base material is heated by the heating part. As the continuous sheet-like base material is deformed by rolling the coated part, the non-coated part is also deformed, so that the non-coated part adjacent to the continuous sheet-like base part is coated even at a high rolling rate. The generation of wrinkles at the part can be suppressed.

  Moreover, in Example 1 of this invention, it is a roll press method which rolls the continuous sheet-like base material which has the coating part in which the coating liquid was coated in part, Comprising: The said continuous sheet-like base material is conveyed By heating the non-coating part adjacent to the coating part while transporting from the upstream to the downstream in the direction, the coating part is rolled. The non-coated part of the material is softened by being heated by the heating part, and the continuous sheet-like base material is deformed by rolling the coated part. Generation | occurrence | production of the wrinkle in the non-coating part adjacent to the coating part of a base material can be suppressed.

  In Example 1, as for the continuous sheet-like base material 1, the coating parts 2 and 3 by which the coating liquid for making an electrode into the center part was continuously applied and dried were one or more along the Y direction. Although formed, in Example 2, at least one of the front and back surfaces of the continuous sheet-like substrate 1 is not continuous, but one or more coating parts 2 and 3 are intermittently formed along the Y direction. Is different in that. That is, in the Y direction, there are intermittent portions where the coating portions 2 and 3 are not formed.

  In the intermittent part in which the coating parts 2 and 3 are not formed in Example 2, the local load accompanying the rolling of the coating parts 2 and 3 is not applied, and thus the wrinkles described above do not occur. Therefore, the coating parts 2 and 3 can be continuously rolled by the roll press machine 1 having the same configuration as that of the first embodiment.

  Therefore, also in Example 2, the non-coated part of the continuous sheet-like base material is softened by being heated by the heating part, and with the deformation of the continuous sheet-like base material by rolling of the coated part, the non-coated part is also By deforming, it is possible to suppress the occurrence of wrinkles in the non-coated portion adjacent to the coated portion of the continuous sheet-like substrate even at a high rolling rate.

The present invention is not limited to the electrodes of secondary batteries, and can be widely applied to rolling continuous sheet-like substrates.

1: Continuous sheet-like base material 2: Coating part 3: Coating part 4: Front side rolling roll 5: Back side rolling roll 6: Conveying direction 7: Coating part adjacent area 10: Front side hot air nozzle 11: Front side hot air nozzle 12: Back side hot air nozzle 13: Back side hot air nozzle 30: Roll press machine 31: Unwinding part 32: Winding part 33: Rolling part 34: Substrate conveying part

Claims (5)

  A roll press machine for rolling a continuous sheet-like base material partially having a coating part coated with a coating liquid, and transporting the continuous sheet-like base material from upstream to downstream in the transport direction A heating roll that rolls the coating portion of the continuous sheet-like substrate to be conveyed, and a non-coating portion on the continuous sheet-like substrate adjacent to the coating portion upstream of the rolling roll. A roll press machine comprising: a heating unit that performs heating.   The roll press according to claim 1, wherein the rolling roll includes a front side rolling roll and a back side rolling roll so as to roll the coated portion on both surfaces of the continuous sheet-like base material. .   The roll press according to claim 1 or 2, wherein the heating unit includes a front side heating unit and a back side heating unit so as to heat both surfaces of the continuous sheet-like base material.   The roll press machine according to any one of claims 1 to 3, wherein the heating unit is configured by a hot air nozzle that injects hot air. A roll press method for rolling a continuous sheet-like base material partially having a coating portion coated with a coating liquid, wherein the continuous sheet-like base material is transported from upstream to downstream in the transport direction. A roll press method characterized by rolling the coated part after heating the non-coated part adjacent to the coated part.

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