Method and apparatus for the conveying and radio frequency processing of dielectric materials
US4546226A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 29, 1982 |
| Grant date | Oct 8, 1985 |
| Priority date | — |
| Expiry date | Apr 29, 2002 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29B7/826
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Particulate dielectric material is processed by radio frequency (RF) energy while being simultaneously conveyed from an inlet to an outlet, by disposing the transmitting and receiving electrodes of an RF generator diametrically opposite each other on the outside of a conveyor tube containing a screw conveyor, both the tube and screw being made of dielectric material. A fiberoptic probe is located at one end to sense the temperature of the particulate material in the conveyor tube and is connected at the opposite end to an infrared sensor which provides an electric output signal proportional to the sensed temperature. This output signal is coupled to a set point controller which provides an electric output signal representing a small temperature range above and below a selected set point temperature, and the latter output signal is coupled to a duty cycle regulator which operates to regulate the "on" time of the RF generator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.