JP3757477B2 - Intermittent application device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an intermittent coating apparatus that applies a coating liquid intermittently on a predetermined medium to form a coating pattern having a certain width and a certain length.
[0002]
[Prior art]
FIG. 3 is an explanatory view showing an outline of a conventional intermittent application apparatus, and FIG. 4 is a plan view showing a specific example of an application pattern formed by such an intermittent application apparatus.
In FIG. 3, the medium 100 is continuously supplied in the arrow Z direction in the figure by a supply mechanism (not shown), and the coating liquid is intermittently applied by the coating head 102 provided in the middle to form an application pattern having a fixed shape. The
The coating head 102 has a die 102A disposed opposite to the coating surface of the medium 100. The coating liquid reservoir 102B to which the coating liquid is supplied to the die 102A, and the medium 100 of the die 102A from the coating liquid reservoir 102B. The slit 102C opening on the opposite surface is formed. The slit 102 </ b> C has a length corresponding to the width of the coating pattern 108.
[0003]
Then, the coating liquid is supplied to the coating surface of the medium 100 from the slit 102C by supplying the coating liquid in the coating material storage tank 106 to the coating liquid reservoir 102B by the coating material supply pump 104. Further, by controlling the start and stop of the paint supply pump 104 at predetermined intervals, a rectangular application pattern 108 as shown in FIG. 4 is formed.
The travel distance of the medium 100 is detected by a pulse encoder (not shown) or the like, and discharge control of the coating liquid in the coating head 102 is performed based on the encoder pulse.
[0004]
[Problems to be solved by the invention]
By the way, in the intermittent application apparatus as described above, when it is attempted to increase the processing speed, it is necessary to increase the supply speed of the medium 100 and to quickly start and stop the paint supply pump 104. The control speed of the coating head 102 by the pump 104 has a certain limit.
In particular, when the gap G between the non-application portions in FIG. 4 is narrow, there is a problem that the coating head 102 cannot be normally controlled by the paint supply pump 104 in this portion, and the formation of an appropriate application pattern cannot be maintained.
[0005]
On the other hand, when the interval G between the non-applied portions is increased, after the processing by the intermittent application apparatus, it is necessary to perform a process of cutting the non-applied portion by leaving a necessary length. Since it becomes long, the amount of waste increases and the yield decreases.
Further, the processing of such an unnecessary non-coated portion causes a problem that the post-process becomes complicated and the equipment cost increases.
An object of the present invention is to provide an intermittent coating apparatus capable of improving the processing speed of intermittent coating even when the interval between coating patterns is small.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides an intermittent coating apparatus that forms a coating pattern of a certain width and a certain length by intermittently coating a coating solution on a continuously supplied medium. And a plurality of coating means for supplying the coating liquid, and the coating pattern is formed by driving each coating means in turn.
In the intermittent coating apparatus of the present invention as described above, the supply of the coating liquid is independently controlled by a plurality of coating means, and the coating pattern is formed in order, so that the coating pattern is increased as the processing speed increases. Even when the cycle is shortened, the control speed of the individual coating means may be slow.
[0007]
For example, when two coating units are provided, the first coating pattern is formed by starting and stopping the first coating unit, and the second coating pattern is formed by starting and stopping the second coating unit. it can.
Therefore, for example, even when the interval G between the non-application portions shown in FIG. 4 is small, it is not necessary to stop and start a single application means in this cycle, and the intermittent application operation can be performed quickly in a stable state. .
[0008]
In an intermittent coating apparatus that forms a coating pattern of constant width and length by applying the same coating liquid intermittently on a continuously supplied medium, the coating liquid reservoir and the coating liquid reservoir coating liquid A paint supply pump comprising: a coating head having N application means (N is an integer of 2 or more) formed of slits for discharging a medium; and N paint supply pumps connected to each of the application means. The coating liquid is supplied to the coating means independently of each other, and the coating pattern is formed by repeating the operation in which the coating liquid supply pump controls the supply of the coating liquid in the first, second,..., Nth order. It is characterized by performing.
In the intermittent coating apparatus of the present invention as described above, the supply of the coating liquid is independently controlled by a plurality of coating means, and the coating pattern is formed in order, so that the coating pattern is increased as the processing speed increases. Even when the cycle is shortened, the control speed of the individual coating means may be slow.
[0009]
The coating liquid reservoirs 14B and 16B of the coating means 14 and 16 are independently connected to the paint supply pumps 14C and 16C, respectively, and the coating liquid in the paint storage tank 18 is individually supplied by the paint supply pumps 14C and 16C. The supply is controlled.
The travel distance of the medium 20 is detected by a pulse encoder (not shown) or the like, and discharge control of the coating liquid from the slits 14A and 16A in the coating head 12 is performed based on the encoder pulse.
Moreover, the intermittent coating apparatus 10 of this example is for producing, for example, a positive electrode member or a negative electrode member of a lithium ion battery. For example, on an aluminum foil constituting a positive electrode member or a copper foil medium 20 constituting a negative electrode member, In the case of the positive electrode, a coating pattern 22 is formed by applying a solvent of carbon, and in the case of the negative electrode, a solvent of lithium cobalt oxide.
[0010]
The medium 20 on which the coating pattern 22 is formed is cut to a predetermined width and cut so as to leave uncoated portions at both ends of the coating pattern 22, and is placed in a battery case in a wound state together with a separator. Is done. Moreover, the non-application part of the both ends of the application pattern 22 is connected as a terminal.
Next, an operation when the coating pattern 22 is formed by the intermittent coating apparatus 10 having the above configuration will be described.
[0011]
FIG. 2 is a plan view showing an example of the coating pattern 22 formed on the medium 20 by the intermittent coating apparatus 10, and the solid line in the drawing shows the coating pattern formed by the first coating unit 14, and the broken line Shows the coating pattern formed by the second coating means 16.
In the intermittent coating apparatus 10, when the coating pattern 22 is continuously formed, after the supply of the medium 20 is started, the first coating pattern 22 </ b> A is formed by the first coating unit 14, and then the second coating is performed. The second coating pattern 22B is formed by the means 16.
Further, the third coating pattern 22C is formed by the first coating unit 14, and the fourth coating pattern 22D is formed by the second coating unit 16.
[0012]
In this manner, by alternately operating the two coating means 14 and 16 to form the uniform coating pattern 22 at equal intervals, even when the interval G between the non-application portions is small, the coating is performed at this cycle. It is not necessary to control the operation of the means 14 and 16, and the intermittent application operation can be performed quickly in a stable state.
That is, when the interval between the non-application portions is G and the length of the application portion (application pattern) is L, the interval between the application operation stop and restart of the application means 14 and 16 is L + 2G, which is In contrast, it is significantly longer.
[0013]
For example, if 5G = L, then L + 2G = 7G. Therefore, if a coating pattern similar to the conventional one is to be formed, it is theoretically possible to work at a processing speed 7 times that greatly increases productivity. Can be improved.
Further, in this example, by providing the two coating means 14 and 16 in one coating head 12, the intermittent coating apparatus can be formed compactly.
Further, in this example, having a plurality of supply means for supplying the coating liquid is advantageous in terms of maintenance because a plurality of supply means can be collectively performed at the time of maintenance.
[0014]
In the above example, the case where the two coating units 14 and 16 are provided in one coating head 12 has been described. However, it is also possible to provide a higher number of coating units to achieve higher speed.
In addition, by providing a preliminary application unit, even if a problem occurs in the application unit in use, the apparatus can be continued using the preliminary application unit without stopping the apparatus for a long time. It becomes possible.
[0016]
【The invention's effect】
As described above, in the intermittent coating apparatus of the present invention, the supply of the coating liquid is independently controlled by a plurality of coating means, and the coating pattern is formed in order, so that coating is performed as the processing speed increases. Even when the period of the pattern is shortened, the control speed of the individual application means may be slow, so that there is an effect that the intermittent application operation can be performed quickly in a stable state.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing an example of an intermittent coating apparatus according to the present invention.
FIG. 2 is a plan view showing an example of a coating pattern formed by the intermittent coating apparatus shown in FIG.
FIG. 3 is an explanatory view showing an example of a conventional intermittent coating apparatus.
4 is a plan view showing an example of a coating pattern formed by the intermittent coating apparatus shown in FIG. 3. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Intermittent coating device, 12 ... Coating head, 12A ... Die, 14, 16 ... Coating means, 14A, 16A ... Slit, 14B, 16B ... Coating liquid reservoir, 14C, 16C ... Paint supply pump 18 ... Paint storage tank, 20 ... Medium, 22, 22A, 22B, 22C, 22E ... Application pattern.

Claims (5)

In an intermittent coating apparatus that forms a coating pattern with a constant width and a constant length by intermittently applying the same coating liquid onto a continuously supplied medium,
A coating head having N coating means (N is an integer of 2 or more) comprising a coating liquid reservoir and a slit for discharging the coating liquid reservoir to the medium;
N paint supply pumps connected to each of the application means;
With
Supply of the coating liquid to the coating means is independently controlled by the paint supply pump, and the paint supply pump controls the supply of the coating liquid in the first, second,..., Nth order. An intermittent coating apparatus characterized by forming a coating pattern by repeating .   The intermittent coating apparatus according to claim 1, wherein the plurality of coating units are arranged in front and back in the supply direction of the medium.   The intermittent coating apparatus according to claim 1, wherein one coating pattern is formed by one driving of one of the plurality of coating units.   The intermittent application apparatus according to claim 3, wherein an application pattern having an equal shape is formed at equal intervals by the plurality of application means.   The intermittent coating apparatus according to claim 1, wherein the medium is cut after forming a coating pattern to be formed as a positive electrode member or a negative electrode member of a battery, and a non-coated region is used as a positive electrode terminal or a negative electrode terminal.

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