Method for modifying surface properties of a disc-like shaped article of a vinyl chloride-based resin
US4410784A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 29, 1981 |
| Grant date | Oct 18, 1983 |
| Priority date | — |
| Expiry date | Jan 29, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S425/81
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The invention provides a novel method for modifying the surface properties, e.g. antistatic performance and anti-wearing resistance, of a disc-like shaped article made of a vinyl chloride-based resin such as a gramophone record by treating with low temperature plasma so as that the surface of the record is rendered antistatic and the noise generation in playing of the record is remarkably decreased. Different from conventional methods, a great uniformity of the effect by the plasma treatment is ensured by the inventive method all over the surface of the record since the record is transferred through the space between two parallel arrays of electrodes, preferably, with rotation around its axis during the plasma treatment. The manner of connecting the electrodes to the terminals of the high frequency generator may be in two different ways. For example, all of the electrodes in one array are connected to the grounded terminal while all of the electrodes in the other array are connected to the power-input terminal. Alternatively, each of the electrodes is connected to a terminal different from that to which both of the neighboring electrodes in the same array and the electrode in the o…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.