Process and device for determining the mass fraction of one constituent of a layer, and effecting the quality control of a composite metal sheet
US5798650A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 6, 1997 |
| Grant date | Aug 25, 1998 |
| Priority date | — |
| Expiry date | Mar 6, 2017 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB32B2307/206
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A process for controlling the weldability of a sheet (1) of the composite metal sheet type having a layer (7) which is interposed between two metal facing sheets (3,5) and comprises a polymer (8) having a filler of conductive particles (9). This process comprises measuring by means of a signal of given frequency f applied to two electrodes (11,13) disposed in facing relation to each other, each electrode being in contact with a corresponding metal facing sheet (3,5), the voltage/current phaseshift .phi. due to the resistive and capacitive properties of the composite sheet (1). The response of the composite sheet (1) to this signal corresponds to that of an equivalent parallel RC circuit. Thereafter, the mass fraction of the conductive particles (9) is calculated from the value of .phi.. By comparing the determined mass fraction with prefixed thresholds, the weldability and the vibration-damping capacity of the composite sheet (1) are evaluated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.