US 11,988,472 B2
Cleaning ball and method for manufacturing same
Takuya Sasaki, Ibaraki (JP)
Assigned to MIZUKI CO., LTD., Ibaraki (JP)
Appl. No. 17/613,923
Filed by MIZUKI CO., LTD., Ibaraki (JP)
PCT Filed Dec. 21, 2020, PCT No. PCT/JP2020/047598
§ 371(c)(1), (2) Date Nov. 23, 2021,
PCT Pub. No. WO2021/157226, PCT Pub. Date Aug. 12, 2021.
Claims priority of application No. 2020-019651 (JP), filed on Feb. 7, 2020.
Prior Publication US 2022/0260328 A1, Aug. 18, 2022
Int. Cl. F28G 1/12 (2006.01); B08B 1/10 (2024.01); B08B 9/04 (2006.01); B08B 9/053 (2006.01); B08B 9/055 (2006.01); B08B 9/057 (2006.01)
CPC F28G 1/12 (2013.01) [B08B 1/10 (2024.01); B08B 9/04 (2013.01); B08B 9/0552 (2013.01); B08B 9/057 (2013.01); B08B 9/053 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A cleaning ball comprising:
a sponge rubber ball configured to clean a heat transfer tube of a condenser; and
a skin layer composed crushed sand bonded to a surface of the sponge rubber ball with an adhesive, wherein
the crushed sand comprises sandstone containing granite particles, and the crushed sand has a particle size between 0.05 mm and 2.00 mm, and
the skin layer is formed in a plurality of concave and convex shapes, on the sponge rubber ball, and is configured to deform corresponding to deformation of the sponge rubber ball.