Doctor for a paper or board machine

D - Textiles – Paper – 21 – G

Patent

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Details

D21G 3/00 (2006.01) D21G 9/00 (2006.01)

Patent

CA 2507274

The invention relates to a doctor for a paper or board machine, which doctor is disposed in connection with a roll or a cylinder/drum (10) of the paper or board machine to keep the surface of the roll or the cylinder/drum (10) clean, which doctor (20) comprises a doctor blade (21) of the doctor to prevent a web (W) from wrapping around the roll or the cylinder/drum (10) during a web break and to help the threading of the web (W). A blow-down device (25) is arranged in connection with the doctor (20) to produce a blow (PA) in order to prevent the web (W) form hitting the doctor (20) and to guide the web (W) past the doctor (20) in a controlled manner.

L'invention concerne un docteur pour une machine à papier ou carton, lequel docteur est placé en liaison avec un rouleau ou un cylindre/tambour (10) de la machine à papier ou carton afin de maintenir la surface du rouleau ou du cylindre/tambour (10) propre. Ce docteur (20) comporte une lame de docteur (21) servant à éviter qu'une bande (W) ne s'enroule autour du rouleau ou du cylindre/tambour (10) lors d'une rupture de bande et à faciliter l'engagement de la bande (W). Un dispositif de chasse (25), placé en liaison avec le docteur (20), est destiné à produire un souffle (PA) permettant d'éviter que la bande (W) ne frappe le docteur (20) et de guider cette bande (W) de façon contrôlée en aval du docteur (20).

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