Method and device for measuring the characteristics of plastic fluid and control system for pouring the same into moulds
US4143541A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Jan 28, 1977 |
| Grant date | Mar 13, 1979 |
| Priority date | — |
| Expiry date | Jan 28, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N33/442
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The fluidity of a plastic fluid, cement mortar for example, is measured by passing the fluid through a flow passage packed with an aggregate for simulating an actual mould, measuring the flow pressure, and measuring the quantitative flow coefficient between the fluid and the flow passage. The pressure remaining in the passage after the fluid has been poured into the passage and after the flow speed has been decreased to zero or the pressure after a quantity of the fluid has been added to the passage and prior to the discharge of the fluid from the passage is measured to determine the relative shear stress yielding value. Thereafter, the fluid is caused to flow to determine again the relative shear stress yielding value, and the relative closure coefficient is determined by the difference between said two relative shear stress yielding values. After the elapse of a predetermined time the plastic fluid is caused to flow under a pressure and the pressure at the commencement of the flow is measured to quantitatively determine the variation in the shear stress yielding value with time, thereby determining the relative initial flow pressure. The relative flow viscosity coefficient is mea…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.