Method and system for controlling a layer thickness in a grinding operation
US5379950A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 27, 1993 |
| Grant date | Jan 10, 1995 |
| Priority date | — |
| Expiry date | Oct 27, 2013 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB02C4/36
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method is described for controlling the grinding of a dispersion of solid particles in a doughy-pasty mass, such as a chocolate mass, on a roller mill line having at least one preceding and one postponed roller mill (1 or 4), of which at east the postponed roller mill (4) is a roll refiner mill with a plurality of rollers (W1-W5). In this arrangement, the outlet roller gap of the preceding roller mill (1) is changed for decreasing or increasing the layer thickness of the mass in the postponed roller mill (4) having at least three rollers. Additionally and besides changing the outlet roller gap of the preceding roller mill (1) a control of the layer thickness of the postponed roller mill (4) is carried out according to a proportional-integral-differential control system. In doing so, the layer thickness can be measured on the postponed roller mill (4) within predetermined limits, with a change-over to the control system of the preceding roller mill (1) taking place upon exceeding these limits due to the difference of the actual thickness to the nominal layer thickness.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.