Multi-step flow cleaning method and multi-step flow cleaning apparatus
US6432218B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 7, 1999 |
| Grant date | Aug 13, 2002 |
| Priority date | — |
| Expiry date | Dec 7, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S134/902
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A multi-step flow cleaning method and a multi-step flow cleaning apparatus are provided which effectively clean workpieces with a stream of a cleaning solution and to suppress an increase of foreign matters adhering to the surfaces of the workpieces. A cleaning tank 10 for holding workpieces is provided, a supply line 14 for supplying a cleaning solution such as pure water from the bottom surface of the cleaning tank is provided, and a valve 12 for adjusting the flow of the cleaning solution is disposed in the middle of the supply line 14. The valve 12 is equipped with a switching section 12a for controlling the outflow of the cleaning solution by opening or closing the supply line 14, and a bypass 12b for supplying the cleaning solution, bypassing the switching section 12a. The valve 12 is provided such that it is able to adjust in two steps the supply flow of the cleaning solution supplied to the cleaning tank 10 by using the supply flow fed through the bypass 12b and the supply flow fed through the switching section 12a.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.