Coating processes – Applying superposed diverse coating or coating a coated base
Reexamination Certificate
1998-06-30
2001-02-27
Bareford, Katherine A. (Department: 1762)
Coating processes
Applying superposed diverse coating or coating a coated base
C427S420000, C118S411000, C118SDIG004
Reexamination Certificate
active
06194034
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a coating method which coats a coating liquid or a coating solution onto a conveyed base member to be coated and to a coating system.
Heretofore, in order to conduct a coating preparation operation while a coating liquid is flowed out when the coating liquid is coated onto a conveyed base member by means of a coater (for example, in the case of a slide hopper coater, in order to conduct equalization of the slit outlet port in such a manner that the coating liquid is uniformly coated from slit of coater
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and cleaning of the drop of excessive coating liquid from lip of coater
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while flowing out the coating liquid), prior to coating the coating liquid onto the base member, the coating liquid is caused to flow out from the coater without coating the coating liquid onto the base member. Therefore, during conducting the coating preparation operation while flowing out the coating liquid from the coater, the coating liquid continues to flow out from the coater. After the coating preparation operation is finished, the base member is conveyed. When the coating starting point of the base member reaches the coater, coating of the coating liquid onto the base member starts.
Heretofore, the flow rate of the coating liquid while conducting the coating preparation operation and until the coating starting point of the base member reaches the coater was the same as coating flow rate.
The coating liquid flowing out during conducting the coating preparation operation is finally discarded. Since the feeding flow rate of the coating liquid while conducting the coating preparation operation was the same as the coating flow rate, there was a problem that loss of expensive coating liquid became large.
The leading portion of the base member is ordinarily a leader for feeding an area of the base member in which the coating liquid is coated at the coating flow rate along with a conveyance path. It is not ordinarily coated. Accordingly, the coating liquid fed until the coating starting point of the above-mentioned base member reaches the coater becomes loss. If the coating liquid is fed to the coater at the same feeding flow rate as the coating flow rate, loss of expensive coating liquid is further increased.
Therefore, if feeding of the coating liquid is stopped since the coating preparation operation is conducted until the coating starting point of the base member reaches the coater in order to prevent increase of the loss of the coating liquid, excessive drop occurs on the lip of the coater or the coating liquid cannot be fed from the slit of the coater. Therefore, feeding of the coating liquid cannot be stopped until the coating starting point of the base member reaches the coater.
SUMMARY OF THE INVENTION
The present invention was attained viewing the above-mentioned situation. An objective of the present invention is to reduce the loss of the coating liquid since the coating preparation operation is conducted until the coating starting point of the base member reaches the coater.
An object of the present invention is attained by each item mentioned below.
Item 1: A coating method which coats a coating liquid onto a conveyed base member by means of a coater, wherein the feeding flow rate of the above-mentioned coating liquid onto the above-mentioned coater is lowered compared with ordinary coating flow rate until the coating starting point of the above-mentioned base member which is a leading point of an area where the above-mentioned coating liquid is coated at the coating flow rate reaches the above-mentioned coater and the feeding flow rate of the above-mentioned coating liquid onto the above-mentioned coater is increased to the above-mentioned coating flow rate in accordance with that the coating starting point of the above-mentioned base member reaches the above-mentioned coater.
Owing to the invention described in Item 1, loss of the coating liquid since the coating preparation operation is conducted until the coating starting point of the base member reaches the coater can be reduced.
Item 2: A coating method which coats a coating liquid with plural layers onto a base member conveyed by means of a coater, wherein the feeding flow rate of at least one layer composing the coating liquid among the above-mentioned plural layers onto the above-mentioned coater is lowered compared with coating flow rate until the coating starting point of the above-mentioned base member which is a leading point of an area where the above-mentioned coating liquid is coated at the coating flow rate reaches the above-mentioned coater and the feeding flow rate of the above-mentioned coating liquid with plural layers onto the above-mentioned coater is increased to the above-mentioned coating flow rate in accordance with that the coating starting point of the above-mentioned base member reaches the above-mentioned coater.
Owing to the invention described in Item 2, loss of the coating liquid since the coating preparation operation is conducted until the coating starting point of the base member reaches the coater can be reduced easily.
Item 3: The coating method described in Item 2 wherein the feeding flow rate of coating liquids for layers, whose flow rate is set to be lower compared to the coating flow rate between the coating starting point of the above-mentioned base member as the coating starting point of the above-mentioned base member reaches the above-mentioned coater, is simultaneously increased.
Owing to the invention described in Item 3, loss of the coating liquid since the coating preparation operation is conducted until the coating starting point of the base member reaches the coater can be reduced easily.
Item 4: The coating method described in Item 2 or 3, wherein the feeding flow rate of the coating liquid for the above-mentioned uppermost layer onto the above-mentioned coater is set to be the coating flow rate and the feeding flow rate of the coating liquid for the layers other than the uppermost layers is set to be lower than the coating flow rate until the coating starting point of the above-mentioned base member reaches the above-mentioned coater and the feeding flow rate of the coating liquid for the above-mentioned plural layers reaches the coating flow rate as the coating starting point of the above-mentioned base member reaches the above-mentioned coater.
Due to the feeding flow rate of the coating liquid for the above-mentioned uppermost layer onto the above-mentioned coater is set to be the coating flow rate until the coating starting point of the above-mentioned base member reaches the above-mentioned coater and the feeding flow rate of the coating liquid for the layers other than the uppermost layer is set to be lower than the coating flow rate until the coating starting point of the above-mentioned base member reaches the above-mentioned coater while the pulling phenomenon on the uppermost layer is prevented. Therefore, loss of the coating liquid until the coating starting point of the base member reaches the coater can be reduced easily.
Item 5: The coating method described in any of Items 2 through 4, wherein the above-mentioned feeding flow rate of the coating liquid for plural layers is controlled by controlling a pump, which feeds the above-mentioned coating liquid for each layer, provided for each of the above-mentioned plural layers.
Owing to the invention described in Item 5, the feeding flow rate onto the coater by means of the pump is controlled. Therefore, time since the feeding flow rate, which is relatively lower, was increased until it reaches the coating flow rate can be shortened.
Item 6: The coating method described in any of Item 1 through 5, wherein the above-mentioned coater is withdrawn from the coater coating position before the coating starting point of the above-mentioned base member reaches the above-mentioned coater and the above-mentioned coater is caused to automatically advance to the above-mentioned coater coating position as the coating starting point of the above-mentioned base member reaches th
Kimura Fumio
Kimura Nobuyuki
Nishi Yasuo
Sakai Tomohiko
Ueno Nobuhiro
Bareford Katherine A.
Bierman Jordan B.
Bierman, Muserlian and Lucas
Konica Corporation
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