Method of controlling a chemical cleaning line for aluminum...

C - Chemistry – Metallurgy – 23 – G

Patent

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Details

C23G 1/12 (2006.01) C23G 1/22 (2006.01) C23G 3/02 (2006.01)

Patent

CA 2439130

An automatic system is used for controlling the cleaning stage of a strip cleaning line, e.g. an aluminum strip cleaning line. The cleaning line includes a chemical cleaning section and at least one rinse section, with cleaning solution being sprayed onto the top and bottom faces of the aluminum strip as it passes through the cleaning section. A programmable logic controller has a dwell time set point for each coil of aluminum strip, which gives for standard conditions of chemical concentration and temperature the time the strip should be exposed to the spray. The controller receives input signals based on the measured temperature and concentration of the cleaning solution and adjusts the dwell time of the cleaning solution spray on the aluminum strip accordingly.

On utilise un système automatique afin de commander l'étape de nettoyage d'une chaîne de nettoyage de bande, par exemple, d'une chaîne de nettoyage de bande d'aluminium. Cette chaîne de nettoyage comprend une section de nettoyage chimique et au moins une section de rinçage, une solution de nettoyage étant pulvérisée sur les faces supérieure et inférieure de la bande d'aluminium simultanément à son passage à travers la section de nettoyage. Un contrôleur à logique programmable possède un point de réglage de durée de résidence pour chaque rouleau de feuillard d'aluminium, ce qui permet d'obtenir les conditions normalisées de concentration chimique et de température, ainsi que la durée optimum d'exposition de la bande à la pulvérisation. Le contrôleur reçoit des signaux d'entrée en fonction de la température mesurée et de la concentration de la solution de nettoyage et règle en conséquence la durée de pulvérisation de la solution de nettoyage sur la bande d'aluminium.

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