US 12,454,130 B2
Maintenance liquid and maintenance method
Yuko Hishida, Matsumoto (JP); Miki Uchida, Matsumoto (JP); Yusuke Mizutaki, Shiojiri (JP); Hiromichi Takanashi, Shiojiri (JP); and Tomohiro Kawasaki, Shiojiri (JP)
Assigned to SEIKO EPSON CORPORATION, (JP)
Filed by SEIKO EPSON CORPORATION, Tokyo (JP)
Filed on Aug. 28, 2023, as Appl. No. 18/456,697.
Claims priority of application No. 2022-135975 (JP), filed on Aug. 29, 2022.
Prior Publication US 2024/0066874 A1, Feb. 29, 2024
Int. Cl. B41J 2/165 (2006.01); C11D 3/43 (2006.01)
CPC B41J 2/16552 (2013.01) [B41J 2/16535 (2013.01); B41J 2/165 (2013.01); B41J 2002/16558 (2013.01); C11D 3/43 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A printing apparatus comprising:
an ink jet head configured to eject an ink for printing;
a maintenance liquid configured to maintain the ink jet head, the maintenance liquid being aqueous and subject to detection by a conductivity-based sensor, and the maintenance liquid comprising at least one selected from the group consisting of inorganic alkalis and ethylenediaminetetraacetic acid compounds, and at least one selected from the group consisting of organic acids and organic alkalis; and
a conductivity-based sensor configured to detect an electrical conductivity of the maintenance liquid,
wherein the electrical conductivity of the maintenance liquid is 100 μS/cm or more, and a pH of the maintenance liquid is 6.0 to 11.