Method and apparatus of protecting a coating plant against explosion
US4546400A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 3, 1983 |
| Grant date | Oct 8, 1985 |
| Priority date | — |
| Expiry date | Jun 3, 2003 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB05B5/08
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method of protecting a plant for coating objects with charged particles as well as a method and apparatus for coating objects is proposed. The generation of an electric arc having a too high energy which can cause an ignition of the particles to be applied onto the object is prevented by applying a test high voltage between the object to be coated and the respective earth connection. An insulation occurring between the object to be coated and the respective earth connection and having a contact resistance smaller than a permitted maximum value is overcome by an arcthrough of lower energy. The current flowing in the closed circuit is measured for determining the contact resistance of the insulation so that the operation of the plant can be stopped when the actual value of the current is below a minimum value as in this case the insulation cannot be overcome by the arcthrough as its contact resistance is higher than the permitted maximum value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.