Method and apparatus for roasting coffee

A - Human Necessities – 23 – F

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A23F 5/04 (2006.01) A23N 12/08 (2006.01)

Patent

CA 2304324

Control of the roasting fluidized bed of coffee. It is governed by determining when the pyrolysis of the roasted batch is at its peak. The roasting is then stopped after a predetermined period of time. The following of the commencement of pyrolysis accurately and uniformly determines the starting period for the timing of the stoppage of the process to obtain uniform roasting result. The process is not vulnerable to variations in roasting such as moisture, temperature of the roasting air etc. Air circulation control conduit is provided with a vent port for gases and an inlet port for fresh air, the two ports can be simultaneously opened or closed while the control conduit is simultaneously closed or opened, respectively. Additional air circulation and discharge systems are disclosed and claimed.

Système de commande du lit de café fluidisé reposant sur la détermination du moment où la pyrolyse de la charge en cours de traitement est optimale. La torréfaction est alors interrompue après un délai prédéfini. Le système de contrôle du début de la pyrolyse détermine avec précision et de manière uniforme le début de la temporisation avant l'arrêt du processus afin d'obtenir une torréfaction uniforme. Le procédé est insensible aux variations du taux d'humidité, de la température de l'air, etc. Le conduit commandant le flux d'air est équipé d'un évent d'évacuation des gaz et d'une entrée d'alimentation en air frais, l'un comme l'autre pouvant être simultanément ouvert ou fermé en même temps que le conduit. D'autres mécanismes de circulation et d'évacuation de l'air sont déposés et font l'objet de revendications.

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